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fune/layout/forms/nsListControlFrame.cpp
Mats Palmgren 74d23ef8ae Bug 1272012 - Support more keys to open and/or toggle a combobox dropdown menu. r=enndeakin 
Up/Down should open the dropdown menu on OSX, but not close it.
Spacebar should toggle the dropdown on OSX, but only if Alt, Ctrl or
Cmd isn't pressed.
Spacebar should open the dropdown on non-OSX platforms, but not close
it, with or without key modifiers.
2016-05-25 10:48:52 +02:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nscore.h"
#include "nsCOMPtr.h"
#include "nsUnicharUtils.h"
#include "nsListControlFrame.h"
#include "nsFormControlFrame.h" // for COMPARE macro
#include "nsGkAtoms.h"
#include "nsIDOMHTMLSelectElement.h"
#include "nsIDOMHTMLOptionElement.h"
#include "nsComboboxControlFrame.h"
#include "nsIDOMHTMLOptGroupElement.h"
#include "nsIPresShell.h"
#include "nsIDOMMouseEvent.h"
#include "nsIXULRuntime.h"
#include "nsFontMetrics.h"
#include "nsIScrollableFrame.h"
#include "nsCSSRendering.h"
#include "nsIDOMEventListener.h"
#include "nsLayoutUtils.h"
#include "nsDisplayList.h"
#include "nsContentUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/HTMLOptionsCollection.h"
#include "mozilla/dom/HTMLSelectElement.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/EventStates.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/TextEvents.h"
#include <algorithm>
using namespace mozilla;
// Constants
const uint32_t kMaxDropDownRows = 20; // This matches the setting for 4.x browsers
const int32_t kNothingSelected = -1;
// Static members
nsListControlFrame * nsListControlFrame::mFocused = nullptr;
nsString * nsListControlFrame::sIncrementalString = nullptr;
// Using for incremental typing navigation
#define INCREMENTAL_SEARCH_KEYPRESS_TIME 1000
// XXX, kyle.yuan@sun.com, there are 4 definitions for the same purpose:
// nsMenuPopupFrame.h, nsListControlFrame.cpp, listbox.xml, tree.xml
// need to find a good place to put them together.
// if someone changes one, please also change the other.
DOMTimeStamp nsListControlFrame::gLastKeyTime = 0;
/******************************************************************************
* nsListEventListener
* This class is responsible for propagating events to the nsListControlFrame.
* Frames are not refcounted so they can't be used as event listeners.
*****************************************************************************/
class nsListEventListener final : public nsIDOMEventListener
{
public:
explicit nsListEventListener(nsListControlFrame *aFrame)
: mFrame(aFrame) { }
void SetFrame(nsListControlFrame *aFrame) { mFrame = aFrame; }
NS_DECL_ISUPPORTS
NS_DECL_NSIDOMEVENTLISTENER
private:
~nsListEventListener() {}
nsListControlFrame *mFrame;
};
//---------------------------------------------------------
nsContainerFrame*
NS_NewListControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
nsListControlFrame* it =
new (aPresShell) nsListControlFrame(aContext);
it->AddStateBits(NS_FRAME_INDEPENDENT_SELECTION);
return it;
}
NS_IMPL_FRAMEARENA_HELPERS(nsListControlFrame)
//---------------------------------------------------------
nsListControlFrame::nsListControlFrame(nsStyleContext* aContext)
: nsHTMLScrollFrame(aContext, false),
mMightNeedSecondPass(false),
mHasPendingInterruptAtStartOfReflow(false),
mDropdownCanGrow(false),
mForceSelection(false),
mLastDropdownComputedBSize(NS_UNCONSTRAINEDSIZE)
{
mComboboxFrame = nullptr;
mChangesSinceDragStart = false;
mButtonDown = false;
mIsAllContentHere = false;
mIsAllFramesHere = false;
mHasBeenInitialized = false;
mNeedToReset = true;
mPostChildrenLoadedReset = false;
mControlSelectMode = false;
}
//---------------------------------------------------------
nsListControlFrame::~nsListControlFrame()
{
mComboboxFrame = nullptr;
}
// for Bug 47302 (remove this comment later)
void
nsListControlFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
// get the receiver interface from the browser button's content node
ENSURE_TRUE(mContent);
// Clear the frame pointer on our event listener, just in case the
// event listener can outlive the frame.
mEventListener->SetFrame(nullptr);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("keydown"),
mEventListener, false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("keypress"),
mEventListener, false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mousedown"),
mEventListener, false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mouseup"),
mEventListener, false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mousemove"),
mEventListener, false);
if (XRE_IsContentProcess() &&
Preferences::GetBool("browser.tabs.remote.desktopbehavior", false)) {
nsContentUtils::AddScriptRunner(
new AsyncEventDispatcher(mContent,
NS_LITERAL_STRING("mozhidedropdown"), true,
true));
}
nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);
nsHTMLScrollFrame::DestroyFrom(aDestructRoot);
}
void
nsListControlFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
// We allow visibility:hidden <select>s to contain visible options.
// Don't allow painting of list controls when painting is suppressed.
// XXX why do we need this here? we should never reach this. Maybe
// because these can have widgets? Hmm
if (aBuilder->IsBackgroundOnly())
return;
DO_GLOBAL_REFLOW_COUNT_DSP("nsListControlFrame");
if (IsInDropDownMode()) {
NS_ASSERTION(NS_GET_A(mLastDropdownBackstopColor) == 255,
"need an opaque backstop color");
// XXX Because we have an opaque widget and we get called to paint with
// this frame as the root of a stacking context we need make sure to draw
// some opaque color over the whole widget. (Bug 511323)
aLists.BorderBackground()->AppendNewToBottom(
new (aBuilder) nsDisplaySolidColor(aBuilder,
this, nsRect(aBuilder->ToReferenceFrame(this), GetSize()),
mLastDropdownBackstopColor));
}
nsHTMLScrollFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
}
/**
* This is called by the SelectsAreaFrame, which is the same
* as the frame returned by GetOptionsContainer. It's the frame which is
* scrolled by us.
* @param aPt the offset of this frame, relative to the rendering reference
* frame
*/
void nsListControlFrame::PaintFocus(DrawTarget* aDrawTarget, nsPoint aPt)
{
if (mFocused != this) return;
nsPresContext* presContext = PresContext();
nsIFrame* containerFrame = GetOptionsContainer();
if (!containerFrame) return;
nsIFrame* childframe = nullptr;
nsCOMPtr<nsIContent> focusedContent = GetCurrentOption();
if (focusedContent) {
childframe = focusedContent->GetPrimaryFrame();
}
nsRect fRect;
if (childframe) {
// get the child rect
fRect = childframe->GetRect();
// get it into our coordinates
fRect.MoveBy(childframe->GetParent()->GetOffsetTo(this));
} else {
float inflation = nsLayoutUtils::FontSizeInflationFor(this);
fRect.x = fRect.y = 0;
if (GetWritingMode().IsVertical()) {
fRect.width = GetScrollPortRect().width;
fRect.height = CalcFallbackRowBSize(inflation);
} else {
fRect.width = CalcFallbackRowBSize(inflation);
fRect.height = GetScrollPortRect().height;
}
fRect.MoveBy(containerFrame->GetOffsetTo(this));
}
fRect += aPt;
bool lastItemIsSelected = false;
if (focusedContent) {
nsCOMPtr<nsIDOMHTMLOptionElement> domOpt =
do_QueryInterface(focusedContent);
if (domOpt) {
domOpt->GetSelected(&lastItemIsSelected);
}
}
// set up back stop colors and then ask L&F service for the real colors
nscolor color =
LookAndFeel::GetColor(lastItemIsSelected ?
LookAndFeel::eColorID_WidgetSelectForeground :
LookAndFeel::eColorID_WidgetSelectBackground);
nsCSSRendering::PaintFocus(presContext, aDrawTarget, fRect, color);
}
void
nsListControlFrame::InvalidateFocus()
{
if (mFocused != this)
return;
nsIFrame* containerFrame = GetOptionsContainer();
if (containerFrame) {
containerFrame->InvalidateFrame();
}
}
NS_QUERYFRAME_HEAD(nsListControlFrame)
NS_QUERYFRAME_ENTRY(nsIFormControlFrame)
NS_QUERYFRAME_ENTRY(nsIListControlFrame)
NS_QUERYFRAME_ENTRY(nsISelectControlFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsHTMLScrollFrame)
#ifdef ACCESSIBILITY
a11y::AccType
nsListControlFrame::AccessibleType()
{
return a11y::eHTMLSelectListType;
}
#endif
static nscoord
GetMaxOptionBSize(nsIFrame* aContainer, WritingMode aWM)
{
nscoord result = 0;
for (nsIFrame* option : aContainer->PrincipalChildList()) {
nscoord optionBSize;
if (nsCOMPtr<nsIDOMHTMLOptGroupElement>
(do_QueryInterface(option->GetContent()))) {
// An optgroup; drill through any scroll frame and recurse. |frame| might
// be null here though if |option| is an anonymous leaf frame of some sort.
auto frame = option->GetContentInsertionFrame();
optionBSize = frame ? GetMaxOptionBSize(frame, aWM) : 0;
} else {
// an option
optionBSize = option->BSize(aWM);
}
if (result < optionBSize)
result = optionBSize;
}
return result;
}
//-----------------------------------------------------------------
// Main Reflow for ListBox/Dropdown
//-----------------------------------------------------------------
nscoord
nsListControlFrame::CalcBSizeOfARow()
{
// Calculate the block size in our writing mode of a single row in the
// listbox or dropdown list by using the tallest thing in the subtree,
// since there may be option groups in addition to option elements,
// either of which may be visible or invisible, may use different
// fonts, etc.
int32_t blockSizeOfARow = GetMaxOptionBSize(GetOptionsContainer(),
GetWritingMode());
// Check to see if we have zero items (and optimize by checking
// blockSizeOfARow first)
if (blockSizeOfARow == 0 && GetNumberOfOptions() == 0) {
float inflation = nsLayoutUtils::FontSizeInflationFor(this);
blockSizeOfARow = CalcFallbackRowBSize(inflation);
}
return blockSizeOfARow;
}
nscoord
nsListControlFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_PREF_WIDTH(this, result);
// Always add scrollbar inline sizes to the pref-inline-size of the
// scrolled content. Combobox frames depend on this happening in the
// dropdown, and standalone listboxes are overflow:scroll so they need
// it too.
WritingMode wm = GetWritingMode();
result = GetScrolledFrame()->GetPrefISize(aRenderingContext);
LogicalMargin scrollbarSize(wm, GetDesiredScrollbarSizes(PresContext(),
aRenderingContext));
result = NSCoordSaturatingAdd(result, scrollbarSize.IStartEnd(wm));
return result;
}
nscoord
nsListControlFrame::GetMinISize(nsRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_MIN_WIDTH(this, result);
// Always add scrollbar inline sizes to the min-inline-size of the
// scrolled content. Combobox frames depend on this happening in the
// dropdown, and standalone listboxes are overflow:scroll so they need
// it too.
WritingMode wm = GetWritingMode();
result = GetScrolledFrame()->GetMinISize(aRenderingContext);
LogicalMargin scrollbarSize(wm, GetDesiredScrollbarSizes(PresContext(),
aRenderingContext));
result += scrollbarSize.IStartEnd(wm);
return result;
}
void
nsListControlFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
NS_PRECONDITION(aReflowState.ComputedISize() != NS_UNCONSTRAINEDSIZE,
"Must have a computed inline size");
SchedulePaint();
mHasPendingInterruptAtStartOfReflow = aPresContext->HasPendingInterrupt();
// If all the content and frames are here
// then initialize it before reflow
if (mIsAllContentHere && !mHasBeenInitialized) {
if (false == mIsAllFramesHere) {
CheckIfAllFramesHere();
}
if (mIsAllFramesHere && !mHasBeenInitialized) {
mHasBeenInitialized = true;
}
}
if (GetStateBits() & NS_FRAME_FIRST_REFLOW) {
nsFormControlFrame::RegUnRegAccessKey(this, true);
}
if (IsInDropDownMode()) {
ReflowAsDropdown(aPresContext, aDesiredSize, aReflowState, aStatus);
return;
}
MarkInReflow();
/*
* Due to the fact that our intrinsic block size depends on the block
* sizes of our kids, we end up having to do two-pass reflow, in
* general -- the first pass to find the intrinsic block size and a
* second pass to reflow the scrollframe at that block size (which
* will size the scrollbars correctly, etc).
*
* Naturally, we want to avoid doing the second reflow as much as
* possible.
* We can skip it in the following cases (in all of which the first
* reflow is already happening at the right block size):
*
* - We're reflowing with a constrained computed block size -- just
* use that block size.
* - We're not dirty and have no dirty kids and shouldn't be reflowing
* all kids. In this case, our cached max block size of a child is
* not going to change.
* - We do our first reflow using our cached max block size of a
* child, then compute the new max block size and it's the same as
* the old one.
*/
bool autoBSize = (aReflowState.ComputedBSize() == NS_UNCONSTRAINEDSIZE);
mMightNeedSecondPass = autoBSize &&
(NS_SUBTREE_DIRTY(this) || aReflowState.ShouldReflowAllKids());
nsHTMLReflowState state(aReflowState);
int32_t length = GetNumberOfRows();
nscoord oldBSizeOfARow = BSizeOfARow();
if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW) && autoBSize) {
// When not doing an initial reflow, and when the block size is
// auto, start off with our computed block size set to what we'd
// expect our block size to be.
nscoord computedBSize = CalcIntrinsicBSize(oldBSizeOfARow, length);
computedBSize = state.ApplyMinMaxBSize(computedBSize);
state.SetComputedBSize(computedBSize);
}
nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
if (!mMightNeedSecondPass) {
NS_ASSERTION(!autoBSize || BSizeOfARow() == oldBSizeOfARow,
"How did our BSize of a row change if nothing was dirty?");
NS_ASSERTION(!autoBSize ||
!(GetStateBits() & NS_FRAME_FIRST_REFLOW),
"How do we not need a second pass during initial reflow at "
"auto BSize?");
NS_ASSERTION(!IsScrollbarUpdateSuppressed(),
"Shouldn't be suppressing if we don't need a second pass!");
if (!autoBSize) {
// Update our mNumDisplayRows based on our new row block size now
// that we know it. Note that if autoBSize and we landed in this
// code then we already set mNumDisplayRows in CalcIntrinsicBSize.
// Also note that we can't use BSizeOfARow() here because that
// just uses a cached value that we didn't compute.
nscoord rowBSize = CalcBSizeOfARow();
if (rowBSize == 0) {
// Just pick something
mNumDisplayRows = 1;
} else {
mNumDisplayRows = std::max(1, state.ComputedBSize() / rowBSize);
}
}
return;
}
mMightNeedSecondPass = false;
// Now see whether we need a second pass. If we do, our
// nsSelectsAreaFrame will have suppressed the scrollbar update.
if (!IsScrollbarUpdateSuppressed()) {
// All done. No need to do more reflow.
NS_ASSERTION(!IsScrollbarUpdateSuppressed(),
"Shouldn't be suppressing if the block size of a row has not "
"changed!");
return;
}
SetSuppressScrollbarUpdate(false);
// Gotta reflow again.
// XXXbz We're just changing the block size here; do we need to dirty
// ourselves or anything like that? We might need to, per the letter
// of the reflow protocol, but things seem to work fine without it...
// Is that just an implementation detail of nsHTMLScrollFrame that
// we're depending on?
nsHTMLScrollFrame::DidReflow(aPresContext, &state,
nsDidReflowStatus::FINISHED);
// Now compute the block size we want to have
nscoord computedBSize = CalcIntrinsicBSize(BSizeOfARow(), length);
computedBSize = state.ApplyMinMaxBSize(computedBSize);
state.SetComputedBSize(computedBSize);
// XXXbz to make the ascent really correct, we should add our
// mComputedPadding.top to it (and subtract it from descent). Need that
// because nsGfxScrollFrame just adds in the border....
nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
}
void
nsListControlFrame::ReflowAsDropdown(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
NS_PRECONDITION(aReflowState.ComputedBSize() == NS_UNCONSTRAINEDSIZE,
"We should not have a computed block size here!");
mMightNeedSecondPass = NS_SUBTREE_DIRTY(this) ||
aReflowState.ShouldReflowAllKids();
WritingMode wm = aReflowState.GetWritingMode();
#ifdef DEBUG
nscoord oldBSizeOfARow = BSizeOfARow();
nscoord oldVisibleBSize = (GetStateBits() & NS_FRAME_FIRST_REFLOW) ?
NS_UNCONSTRAINEDSIZE : GetScrolledFrame()->BSize(wm);
#endif
nsHTMLReflowState state(aReflowState);
if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
// When not doing an initial reflow, and when the block size is
// auto, start off with our computed block size set to what we'd
// expect our block size to be.
// Note: At this point, mLastDropdownComputedBSize can be
// NS_UNCONSTRAINEDSIZE in cases when last time we didn't have to
// constrain the block size. That's fine; just do the same thing as
// last time.
state.SetComputedBSize(mLastDropdownComputedBSize);
}
nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
if (!mMightNeedSecondPass) {
NS_ASSERTION(oldVisibleBSize == GetScrolledFrame()->BSize(wm),
"How did our kid's BSize change if nothing was dirty?");
NS_ASSERTION(BSizeOfARow() == oldBSizeOfARow,
"How did our BSize of a row change if nothing was dirty?");
NS_ASSERTION(!IsScrollbarUpdateSuppressed(),
"Shouldn't be suppressing if we don't need a second pass!");
NS_ASSERTION(!(GetStateBits() & NS_FRAME_FIRST_REFLOW),
"How can we avoid a second pass during first reflow?");
return;
}
mMightNeedSecondPass = false;
// Now see whether we need a second pass. If we do, our nsSelectsAreaFrame
// will have suppressed the scrollbar update.
if (!IsScrollbarUpdateSuppressed()) {
// All done. No need to do more reflow.
NS_ASSERTION(!(GetStateBits() & NS_FRAME_FIRST_REFLOW),
"How can we avoid a second pass during first reflow?");
return;
}
SetSuppressScrollbarUpdate(false);
nscoord visibleBSize = GetScrolledFrame()->BSize(wm);
nscoord blockSizeOfARow = BSizeOfARow();
// Gotta reflow again.
// XXXbz We're just changing the block size here; do we need to dirty
// ourselves or anything like that? We might need to, per the letter
// of the reflow protocol, but things seem to work fine without it...
// Is that just an implementation detail of nsHTMLScrollFrame that
// we're depending on?
nsHTMLScrollFrame::DidReflow(aPresContext, &state,
nsDidReflowStatus::FINISHED);
// Now compute the block size we want to have.
// Note: no need to apply min/max constraints, since we have no such
// rules applied to the combobox dropdown.
mDropdownCanGrow = false;
if (visibleBSize <= 0 || blockSizeOfARow <= 0 || XRE_IsContentProcess()) {
// Looks like we have no options. Just size us to a single row
// block size.
state.SetComputedBSize(blockSizeOfARow);
mNumDisplayRows = 1;
} else {
nsComboboxControlFrame* combobox =
static_cast<nsComboboxControlFrame*>(mComboboxFrame);
LogicalPoint translation(wm);
nscoord before, after;
combobox->GetAvailableDropdownSpace(wm, &before, &after, &translation);
if (before <= 0 && after <= 0) {
state.SetComputedBSize(blockSizeOfARow);
mNumDisplayRows = 1;
mDropdownCanGrow = GetNumberOfRows() > 1;
} else {
nscoord bp = aReflowState.ComputedLogicalBorderPadding().BStartEnd(wm);
nscoord availableBSize = std::max(before, after) - bp;
nscoord newBSize;
uint32_t rows;
if (visibleBSize <= availableBSize) {
// The dropdown fits in the available block size.
rows = GetNumberOfRows();
mNumDisplayRows = clamped<uint32_t>(rows, 1, kMaxDropDownRows);
if (mNumDisplayRows == rows) {
newBSize = visibleBSize; // use the exact block size
} else {
newBSize = mNumDisplayRows * blockSizeOfARow; // approximate
// The approximation here might actually be too big (bug 1208978);
// don't let it exceed the actual block-size of the list.
newBSize = std::min(newBSize, visibleBSize);
}
} else {
rows = availableBSize / blockSizeOfARow;
mNumDisplayRows = clamped<uint32_t>(rows, 1, kMaxDropDownRows);
newBSize = mNumDisplayRows * blockSizeOfARow; // approximate
}
state.SetComputedBSize(newBSize);
mDropdownCanGrow = visibleBSize - newBSize >= blockSizeOfARow &&
mNumDisplayRows != kMaxDropDownRows;
}
}
mLastDropdownComputedBSize = state.ComputedBSize();
nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
}
ScrollbarStyles
nsListControlFrame::GetScrollbarStyles() const
{
// We can't express this in the style system yet; when we can, this can go away
// and GetScrollbarStyles can be devirtualized
int32_t style = IsInDropDownMode() ? NS_STYLE_OVERFLOW_AUTO
: NS_STYLE_OVERFLOW_SCROLL;
if (GetWritingMode().IsVertical()) {
return ScrollbarStyles(style, NS_STYLE_OVERFLOW_HIDDEN);
} else {
return ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN, style);
}
}
bool
nsListControlFrame::ShouldPropagateComputedBSizeToScrolledContent() const
{
return !IsInDropDownMode();
}
//---------------------------------------------------------
nsContainerFrame*
nsListControlFrame::GetContentInsertionFrame() {
return GetOptionsContainer()->GetContentInsertionFrame();
}
//---------------------------------------------------------
bool
nsListControlFrame::ExtendedSelection(int32_t aStartIndex,
int32_t aEndIndex,
bool aClearAll)
{
return SetOptionsSelectedFromFrame(aStartIndex, aEndIndex,
true, aClearAll);
}
//---------------------------------------------------------
bool
nsListControlFrame::SingleSelection(int32_t aClickedIndex, bool aDoToggle)
{
if (mComboboxFrame) {
mComboboxFrame->UpdateRecentIndex(GetSelectedIndex());
}
bool wasChanged = false;
// Get Current selection
if (aDoToggle) {
wasChanged = ToggleOptionSelectedFromFrame(aClickedIndex);
} else {
wasChanged = SetOptionsSelectedFromFrame(aClickedIndex, aClickedIndex,
true, true);
}
nsWeakFrame weakFrame(this);
ScrollToIndex(aClickedIndex);
if (!weakFrame.IsAlive()) {
return wasChanged;
}
#ifdef ACCESSIBILITY
bool isCurrentOptionChanged = mEndSelectionIndex != aClickedIndex;
#endif
mStartSelectionIndex = aClickedIndex;
mEndSelectionIndex = aClickedIndex;
InvalidateFocus();
#ifdef ACCESSIBILITY
if (isCurrentOptionChanged) {
FireMenuItemActiveEvent();
}
#endif
return wasChanged;
}
void
nsListControlFrame::InitSelectionRange(int32_t aClickedIndex)
{
//
// If nothing is selected, set the start selection depending on where
// the user clicked and what the initial selection is:
// - if the user clicked *before* selectedIndex, set the start index to
// the end of the first contiguous selection.
// - if the user clicked *after* the end of the first contiguous
// selection, set the start index to selectedIndex.
// - if the user clicked *within* the first contiguous selection, set the
// start index to selectedIndex.
// The last two rules, of course, boil down to the same thing: if the user
// clicked >= selectedIndex, return selectedIndex.
//
// This makes it so that shift click works properly when you first click
// in a multiple select.
//
int32_t selectedIndex = GetSelectedIndex();
if (selectedIndex >= 0) {
// Get the end of the contiguous selection
RefPtr<dom::HTMLOptionsCollection> options = GetOptions();
NS_ASSERTION(options, "Collection of options is null!");
uint32_t numOptions = options->Length();
// Push i to one past the last selected index in the group.
uint32_t i;
for (i = selectedIndex + 1; i < numOptions; i++) {
if (!options->ItemAsOption(i)->Selected()) {
break;
}
}
if (aClickedIndex < selectedIndex) {
// User clicked before selection, so start selection at end of
// contiguous selection
mStartSelectionIndex = i-1;
mEndSelectionIndex = selectedIndex;
} else {
// User clicked after selection, so start selection at start of
// contiguous selection
mStartSelectionIndex = selectedIndex;
mEndSelectionIndex = i-1;
}
}
}
static uint32_t
CountOptionsAndOptgroups(nsIFrame* aFrame)
{
uint32_t count = 0;
nsFrameList::Enumerator e(aFrame->PrincipalChildList());
for (; !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
nsIContent* content = child->GetContent();
if (content) {
if (content->IsHTMLElement(nsGkAtoms::option)) {
++count;
} else {
nsCOMPtr<nsIDOMHTMLOptGroupElement> optgroup = do_QueryInterface(content);
if (optgroup) {
nsAutoString label;
optgroup->GetLabel(label);
if (label.Length() > 0) {
++count;
}
count += CountOptionsAndOptgroups(child);
}
}
}
}
return count;
}
uint32_t
nsListControlFrame::GetNumberOfRows()
{
return ::CountOptionsAndOptgroups(GetContentInsertionFrame());
}
//---------------------------------------------------------
bool
nsListControlFrame::PerformSelection(int32_t aClickedIndex,
bool aIsShift,
bool aIsControl)
{
bool wasChanged = false;
if (aClickedIndex == kNothingSelected && !mForceSelection) {
// Ignore kNothingSelected unless the selection is forced
} else if (GetMultiple()) {
if (aIsShift) {
// Make sure shift+click actually does something expected when
// the user has never clicked on the select
if (mStartSelectionIndex == kNothingSelected) {
InitSelectionRange(aClickedIndex);
}
// Get the range from beginning (low) to end (high)
// Shift *always* works, even if the current option is disabled
int32_t startIndex;
int32_t endIndex;
if (mStartSelectionIndex == kNothingSelected) {
startIndex = aClickedIndex;
endIndex = aClickedIndex;
} else if (mStartSelectionIndex <= aClickedIndex) {
startIndex = mStartSelectionIndex;
endIndex = aClickedIndex;
} else {
startIndex = aClickedIndex;
endIndex = mStartSelectionIndex;
}
// Clear only if control was not pressed
wasChanged = ExtendedSelection(startIndex, endIndex, !aIsControl);
nsWeakFrame weakFrame(this);
ScrollToIndex(aClickedIndex);
if (!weakFrame.IsAlive()) {
return wasChanged;
}
if (mStartSelectionIndex == kNothingSelected) {
mStartSelectionIndex = aClickedIndex;
}
#ifdef ACCESSIBILITY
bool isCurrentOptionChanged = mEndSelectionIndex != aClickedIndex;
#endif
mEndSelectionIndex = aClickedIndex;
InvalidateFocus();
#ifdef ACCESSIBILITY
if (isCurrentOptionChanged) {
FireMenuItemActiveEvent();
}
#endif
} else if (aIsControl) {
wasChanged = SingleSelection(aClickedIndex, true); // might destroy us
} else {
wasChanged = SingleSelection(aClickedIndex, false); // might destroy us
}
} else {
wasChanged = SingleSelection(aClickedIndex, false); // might destroy us
}
return wasChanged;
}
//---------------------------------------------------------
bool
nsListControlFrame::HandleListSelection(nsIDOMEvent* aEvent,
int32_t aClickedIndex)
{
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aEvent);
bool isShift;
bool isControl;
#ifdef XP_MACOSX
mouseEvent->GetMetaKey(&isControl);
#else
mouseEvent->GetCtrlKey(&isControl);
#endif
mouseEvent->GetShiftKey(&isShift);
return PerformSelection(aClickedIndex, isShift, isControl); // might destroy us
}
//---------------------------------------------------------
void
nsListControlFrame::CaptureMouseEvents(bool aGrabMouseEvents)
{
// Currently cocoa widgets use a native popup widget which tracks clicks synchronously,
// so we never want to do mouse capturing. Note that we only bail if the list
// is in drop-down mode, and the caller is requesting capture (we let release capture
// requests go through to ensure that we can release capture requested via other
// code paths, if any exist).
if (aGrabMouseEvents && IsInDropDownMode() && nsComboboxControlFrame::ToolkitHasNativePopup())
return;
if (aGrabMouseEvents) {
nsIPresShell::SetCapturingContent(mContent, CAPTURE_IGNOREALLOWED);
} else {
nsIContent* capturingContent = nsIPresShell::GetCapturingContent();
bool dropDownIsHidden = false;
if (IsInDropDownMode()) {
dropDownIsHidden = !mComboboxFrame->IsDroppedDown();
}
if (capturingContent == mContent || dropDownIsHidden) {
// only clear the capturing content if *we* are the ones doing the
// capturing (or if the dropdown is hidden, in which case NO-ONE should
// be capturing anything - it could be a scrollbar inside this listbox
// which is actually grabbing
// This shouldn't be necessary. We should simply ensure that events targeting
// scrollbars are never visible to DOM consumers.
nsIPresShell::SetCapturingContent(nullptr, 0);
}
}
}
//---------------------------------------------------------
nsresult
nsListControlFrame::HandleEvent(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
NS_ENSURE_ARG_POINTER(aEventStatus);
/*const char * desc[] = {"eMouseMove",
"NS_MOUSE_LEFT_BUTTON_UP",
"NS_MOUSE_LEFT_BUTTON_DOWN",
"<NA>","<NA>","<NA>","<NA>","<NA>","<NA>","<NA>",
"NS_MOUSE_MIDDLE_BUTTON_UP",
"NS_MOUSE_MIDDLE_BUTTON_DOWN",
"<NA>","<NA>","<NA>","<NA>","<NA>","<NA>","<NA>","<NA>",
"NS_MOUSE_RIGHT_BUTTON_UP",
"NS_MOUSE_RIGHT_BUTTON_DOWN",
"eMouseOver",
"eMouseOut",
"NS_MOUSE_LEFT_DOUBLECLICK",
"NS_MOUSE_MIDDLE_DOUBLECLICK",
"NS_MOUSE_RIGHT_DOUBLECLICK",
"NS_MOUSE_LEFT_CLICK",
"NS_MOUSE_MIDDLE_CLICK",
"NS_MOUSE_RIGHT_CLICK"};
int inx = aEvent->mMessage - eMouseEventFirst;
if (inx >= 0 && inx <= (NS_MOUSE_RIGHT_CLICK - eMouseEventFirst)) {
printf("Mouse in ListFrame %s [%d]\n", desc[inx], aEvent->mMessage);
} else {
printf("Mouse in ListFrame <UNKNOWN> [%d]\n", aEvent->mMessage);
}*/
if (nsEventStatus_eConsumeNoDefault == *aEventStatus)
return NS_OK;
// do we have style that affects how we are selected?
// do we have user-input style?
const nsStyleUserInterface* uiStyle = StyleUserInterface();
if (uiStyle->mUserInput == NS_STYLE_USER_INPUT_NONE || uiStyle->mUserInput == NS_STYLE_USER_INPUT_DISABLED)
return nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED))
return NS_OK;
return nsHTMLScrollFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
//---------------------------------------------------------
void
nsListControlFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList)
{
if (aListID == kPrincipalList) {
// First check to see if all the content has been added
mIsAllContentHere = mContent->IsDoneAddingChildren();
if (!mIsAllContentHere) {
mIsAllFramesHere = false;
mHasBeenInitialized = false;
}
}
nsHTMLScrollFrame::SetInitialChildList(aListID, aChildList);
// If all the content is here now check
// to see if all the frames have been created
/*if (mIsAllContentHere) {
// If all content and frames are here
// the reset/initialize
if (CheckIfAllFramesHere()) {
ResetList(aPresContext);
mHasBeenInitialized = true;
}
}*/
}
//---------------------------------------------------------
void
nsListControlFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsHTMLScrollFrame::Init(aContent, aParent, aPrevInFlow);
// we shouldn't have to unregister this listener because when
// our frame goes away all these content node go away as well
// because our frame is the only one who references them.
// we need to hook up our listeners before the editor is initialized
mEventListener = new nsListEventListener(this);
mContent->AddSystemEventListener(NS_LITERAL_STRING("keydown"),
mEventListener, false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("keypress"),
mEventListener, false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("mousedown"),
mEventListener, false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("mouseup"),
mEventListener, false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("mousemove"),
mEventListener, false, false);
mStartSelectionIndex = kNothingSelected;
mEndSelectionIndex = kNothingSelected;
mLastDropdownBackstopColor = PresContext()->DefaultBackgroundColor();
if (IsInDropDownMode()) {
AddStateBits(NS_FRAME_IN_POPUP);
}
}
dom::HTMLOptionsCollection*
nsListControlFrame::GetOptions() const
{
dom::HTMLSelectElement* select =
dom::HTMLSelectElement::FromContentOrNull(mContent);
NS_ENSURE_TRUE(select, nullptr);
return select->Options();
}
dom::HTMLOptionElement*
nsListControlFrame::GetOption(uint32_t aIndex) const
{
dom::HTMLSelectElement* select =
dom::HTMLSelectElement::FromContentOrNull(mContent);
NS_ENSURE_TRUE(select, nullptr);
return select->Item(aIndex);
}
NS_IMETHODIMP
nsListControlFrame::OnOptionSelected(int32_t aIndex, bool aSelected)
{
if (aSelected) {
ScrollToIndex(aIndex);
}
return NS_OK;
}
void
nsListControlFrame::OnContentReset()
{
ResetList(true);
}
void
nsListControlFrame::ResetList(bool aAllowScrolling)
{
// if all the frames aren't here
// don't bother reseting
if (!mIsAllFramesHere) {
return;
}
if (aAllowScrolling) {
mPostChildrenLoadedReset = true;
// Scroll to the selected index
int32_t indexToSelect = kNothingSelected;
nsCOMPtr<nsIDOMHTMLSelectElement> selectElement(do_QueryInterface(mContent));
NS_ASSERTION(selectElement, "No select element!");
if (selectElement) {
selectElement->GetSelectedIndex(&indexToSelect);
nsWeakFrame weakFrame(this);
ScrollToIndex(indexToSelect);
if (!weakFrame.IsAlive()) {
return;
}
}
}
mStartSelectionIndex = kNothingSelected;
mEndSelectionIndex = kNothingSelected;
InvalidateFocus();
// Combobox will redisplay itself with the OnOptionSelected event
}
void
nsListControlFrame::SetFocus(bool aOn, bool aRepaint)
{
InvalidateFocus();
if (aOn) {
ComboboxFocusSet();
mFocused = this;
} else {
mFocused = nullptr;
}
InvalidateFocus();
}
void nsListControlFrame::ComboboxFocusSet()
{
gLastKeyTime = 0;
}
void
nsListControlFrame::SetComboboxFrame(nsIFrame* aComboboxFrame)
{
if (nullptr != aComboboxFrame) {
mComboboxFrame = do_QueryFrame(aComboboxFrame);
}
}
void
nsListControlFrame::GetOptionText(uint32_t aIndex, nsAString& aStr)
{
aStr.Truncate();
if (dom::HTMLOptionElement* optionElement = GetOption(aIndex)) {
optionElement->GetText(aStr);
}
}
int32_t
nsListControlFrame::GetSelectedIndex()
{
dom::HTMLSelectElement* select =
dom::HTMLSelectElement::FromContentOrNull(mContent);
return select->SelectedIndex();
}
dom::HTMLOptionElement*
nsListControlFrame::GetCurrentOption()
{
// The mEndSelectionIndex is what is currently being selected. Use
// the selected index if this is kNothingSelected.
int32_t focusedIndex = (mEndSelectionIndex == kNothingSelected) ?
GetSelectedIndex() : mEndSelectionIndex;
if (focusedIndex != kNothingSelected) {
return GetOption(AssertedCast<uint32_t>(focusedIndex));
}
// There is no selected item. Return the first non-disabled item.
RefPtr<dom::HTMLSelectElement> selectElement =
dom::HTMLSelectElement::FromContent(mContent);
for (uint32_t i = 0, length = selectElement->Length(); i < length; ++i) {
dom::HTMLOptionElement* node = selectElement->Item(i);
if (!node) {
return nullptr;
}
if (!selectElement->IsOptionDisabled(node)) {
return node;
}
}
return nullptr;
}
bool
nsListControlFrame::IsInDropDownMode() const
{
return (mComboboxFrame != nullptr);
}
uint32_t
nsListControlFrame::GetNumberOfOptions()
{
dom::HTMLOptionsCollection* options = GetOptions();
if (!options) {
return 0;
}
return options->Length();
}
//----------------------------------------------------------------------
// nsISelectControlFrame
//----------------------------------------------------------------------
bool nsListControlFrame::CheckIfAllFramesHere()
{
// Get the number of optgroups and options
//int32_t numContentItems = 0;
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(mContent));
if (node) {
// XXX Need to find a fail proff way to determine that
// all the frames are there
mIsAllFramesHere = true;//NS_OK == CountAllChild(node, numContentItems);
}
// now make sure we have a frame each piece of content
return mIsAllFramesHere;
}
NS_IMETHODIMP
nsListControlFrame::DoneAddingChildren(bool aIsDone)
{
mIsAllContentHere = aIsDone;
if (mIsAllContentHere) {
// Here we check to see if all the frames have been created
// for all the content.
// If so, then we can initialize;
if (!mIsAllFramesHere) {
// if all the frames are now present we can initialize
if (CheckIfAllFramesHere()) {
mHasBeenInitialized = true;
ResetList(true);
}
}
}
return NS_OK;
}
NS_IMETHODIMP
nsListControlFrame::AddOption(int32_t aIndex)
{
#ifdef DO_REFLOW_DEBUG
printf("---- Id: %d nsLCF %p Added Option %d\n", mReflowId, this, aIndex);
#endif
if (!mIsAllContentHere) {
mIsAllContentHere = mContent->IsDoneAddingChildren();
if (!mIsAllContentHere) {
mIsAllFramesHere = false;
mHasBeenInitialized = false;
} else {
mIsAllFramesHere = (aIndex == static_cast<int32_t>(GetNumberOfOptions()-1));
}
}
// Make sure we scroll to the selected option as needed
mNeedToReset = true;
if (!mHasBeenInitialized) {
return NS_OK;
}
mPostChildrenLoadedReset = mIsAllContentHere;
return NS_OK;
}
static int32_t
DecrementAndClamp(int32_t aSelectionIndex, int32_t aLength)
{
return aLength == 0 ? kNothingSelected : std::max(0, aSelectionIndex - 1);
}
NS_IMETHODIMP
nsListControlFrame::RemoveOption(int32_t aIndex)
{
NS_PRECONDITION(aIndex >= 0, "negative <option> index");
// Need to reset if we're a dropdown
if (IsInDropDownMode()) {
mNeedToReset = true;
mPostChildrenLoadedReset = mIsAllContentHere;
}
if (mStartSelectionIndex != kNothingSelected) {
NS_ASSERTION(mEndSelectionIndex != kNothingSelected, "");
int32_t numOptions = GetNumberOfOptions();
// NOTE: numOptions is the new number of options whereas aIndex is the
// unadjusted index of the removed option (hence the <= below).
NS_ASSERTION(aIndex <= numOptions, "out-of-bounds <option> index");
int32_t forward = mEndSelectionIndex - mStartSelectionIndex;
int32_t* low = forward >= 0 ? &mStartSelectionIndex : &mEndSelectionIndex;
int32_t* high = forward >= 0 ? &mEndSelectionIndex : &mStartSelectionIndex;
if (aIndex < *low)
*low = ::DecrementAndClamp(*low, numOptions);
if (aIndex <= *high)
*high = ::DecrementAndClamp(*high, numOptions);
if (forward == 0)
*low = *high;
}
else
NS_ASSERTION(mEndSelectionIndex == kNothingSelected, "");
InvalidateFocus();
return NS_OK;
}
//---------------------------------------------------------
// Set the option selected in the DOM. This method is named
// as it is because it indicates that the frame is the source
// of this event rather than the receiver.
bool
nsListControlFrame::SetOptionsSelectedFromFrame(int32_t aStartIndex,
int32_t aEndIndex,
bool aValue,
bool aClearAll)
{
RefPtr<dom::HTMLSelectElement> selectElement =
dom::HTMLSelectElement::FromContent(mContent);
uint32_t mask = dom::HTMLSelectElement::NOTIFY;
if (mForceSelection) {
mask |= dom::HTMLSelectElement::SET_DISABLED;
}
if (aValue) {
mask |= dom::HTMLSelectElement::IS_SELECTED;
}
if (aClearAll) {
mask |= dom::HTMLSelectElement::CLEAR_ALL;
}
return selectElement->SetOptionsSelectedByIndex(aStartIndex, aEndIndex, mask);
}
bool
nsListControlFrame::ToggleOptionSelectedFromFrame(int32_t aIndex)
{
RefPtr<dom::HTMLOptionElement> option =
GetOption(static_cast<uint32_t>(aIndex));
NS_ENSURE_TRUE(option, false);
RefPtr<dom::HTMLSelectElement> selectElement =
dom::HTMLSelectElement::FromContent(mContent);
uint32_t mask = dom::HTMLSelectElement::NOTIFY;
if (!option->Selected()) {
mask |= dom::HTMLSelectElement::IS_SELECTED;
}
return selectElement->SetOptionsSelectedByIndex(aIndex, aIndex, mask);
}
// Dispatch event and such
bool
nsListControlFrame::UpdateSelection()
{
if (mIsAllFramesHere) {
// if it's a combobox, display the new text
nsWeakFrame weakFrame(this);
if (mComboboxFrame) {
mComboboxFrame->RedisplaySelectedText();
// When dropdown list is open, onchange event will be fired when Enter key
// is hit or when dropdown list is dismissed.
if (mComboboxFrame->IsDroppedDown()) {
return weakFrame.IsAlive();
}
}
if (mIsAllContentHere) {
FireOnChange();
}
return weakFrame.IsAlive();
}
return true;
}
void
nsListControlFrame::ComboboxFinish(int32_t aIndex)
{
gLastKeyTime = 0;
if (mComboboxFrame) {
int32_t displayIndex = mComboboxFrame->GetIndexOfDisplayArea();
// Make sure we can always reset to the displayed index
mForceSelection = displayIndex == aIndex;
nsWeakFrame weakFrame(this);
PerformSelection(aIndex, false, false); // might destroy us
if (!weakFrame.IsAlive() || !mComboboxFrame) {
return;
}
if (displayIndex != aIndex) {
mComboboxFrame->RedisplaySelectedText(); // might destroy us
}
if (weakFrame.IsAlive() && mComboboxFrame) {
mComboboxFrame->RollupFromList(); // might destroy us
}
}
}
// Send out an onchange notification.
void
nsListControlFrame::FireOnChange()
{
if (mComboboxFrame) {
// Return hit without changing anything
int32_t index = mComboboxFrame->UpdateRecentIndex(NS_SKIP_NOTIFY_INDEX);
if (index == NS_SKIP_NOTIFY_INDEX)
return;
// See if the selection actually changed
if (index == GetSelectedIndex())
return;
}
// Dispatch the change event.
nsContentUtils::DispatchTrustedEvent(mContent->OwnerDoc(), mContent,
NS_LITERAL_STRING("change"), true,
false);
}
NS_IMETHODIMP
nsListControlFrame::OnSetSelectedIndex(int32_t aOldIndex, int32_t aNewIndex)
{
if (mComboboxFrame) {
// UpdateRecentIndex with NS_SKIP_NOTIFY_INDEX, so that we won't fire an onchange
// event for this setting of selectedIndex.
mComboboxFrame->UpdateRecentIndex(NS_SKIP_NOTIFY_INDEX);
}
nsWeakFrame weakFrame(this);
ScrollToIndex(aNewIndex);
if (!weakFrame.IsAlive()) {
return NS_OK;
}
mStartSelectionIndex = aNewIndex;
mEndSelectionIndex = aNewIndex;
InvalidateFocus();
#ifdef ACCESSIBILITY
FireMenuItemActiveEvent();
#endif
return NS_OK;
}
//----------------------------------------------------------------------
// End nsISelectControlFrame
//----------------------------------------------------------------------
nsresult
nsListControlFrame::SetFormProperty(nsIAtom* aName,
const nsAString& aValue)
{
if (nsGkAtoms::selected == aName) {
return NS_ERROR_INVALID_ARG; // Selected is readonly according to spec.
} else if (nsGkAtoms::selectedindex == aName) {
// You shouldn't be calling me for this!!!
return NS_ERROR_INVALID_ARG;
}
// We should be told about selectedIndex by the DOM element through
// OnOptionSelected
return NS_OK;
}
void
nsListControlFrame::AboutToDropDown()
{
NS_ASSERTION(IsInDropDownMode(),
"AboutToDropDown called without being in dropdown mode");
// Our widget doesn't get invalidated on changes to the rest of the document,
// so compute and store this color at the start of a dropdown so we don't
// get weird painting behaviour.
// We start looking for backgrounds above the combobox frame to avoid
// duplicating the combobox frame's background and compose each background
// color we find underneath until we have an opaque color, or run out of
// backgrounds. We compose with the PresContext default background color,
// which is always opaque, in case we don't end up with an opaque color.
// This gives us a very poor approximation of translucency.
nsIFrame* comboboxFrame = do_QueryFrame(mComboboxFrame);
nsStyleContext* context = comboboxFrame->StyleContext()->GetParent();
mLastDropdownBackstopColor = NS_RGBA(0,0,0,0);
while (NS_GET_A(mLastDropdownBackstopColor) < 255 && context) {
mLastDropdownBackstopColor =
NS_ComposeColors(context->StyleBackground()->mBackgroundColor,
mLastDropdownBackstopColor);
context = context->GetParent();
}
mLastDropdownBackstopColor =
NS_ComposeColors(PresContext()->DefaultBackgroundColor(),
mLastDropdownBackstopColor);
if (mIsAllContentHere && mIsAllFramesHere && mHasBeenInitialized) {
nsWeakFrame weakFrame(this);
ScrollToIndex(GetSelectedIndex());
if (!weakFrame.IsAlive()) {
return;
}
#ifdef ACCESSIBILITY
FireMenuItemActiveEvent(); // Inform assistive tech what got focus
#endif
}
mItemSelectionStarted = false;
mForceSelection = false;
}
// We are about to be rolledup from the outside (ComboboxFrame)
void
nsListControlFrame::AboutToRollup()
{
// We've been updating the combobox with the keyboard up until now, but not
// with the mouse. The problem is, even with mouse selection, we are
// updating the <select>. So if the mouse goes over an option just before
// he leaves the box and clicks, that's what the <select> will show.
//
// To deal with this we say "whatever is in the combobox is canonical."
// - IF the combobox is different from the current selected index, we
// reset the index.
if (IsInDropDownMode()) {
ComboboxFinish(mComboboxFrame->GetIndexOfDisplayArea()); // might destroy us
}
}
void
nsListControlFrame::DidReflow(nsPresContext* aPresContext,
const nsHTMLReflowState* aReflowState,
nsDidReflowStatus aStatus)
{
bool wasInterrupted = !mHasPendingInterruptAtStartOfReflow &&
aPresContext->HasPendingInterrupt();
nsHTMLScrollFrame::DidReflow(aPresContext, aReflowState, aStatus);
if (mNeedToReset && !wasInterrupted) {
mNeedToReset = false;
// Suppress scrolling to the selected element if we restored
// scroll history state AND the list contents have not changed
// since we loaded all the children AND nothing else forced us
// to scroll by calling ResetList(true). The latter two conditions
// are folded into mPostChildrenLoadedReset.
//
// The idea is that we want scroll history restoration to trump ResetList
// scrolling to the selected element, when the ResetList was probably only
// caused by content loading normally.
ResetList(!DidHistoryRestore() || mPostChildrenLoadedReset);
}
mHasPendingInterruptAtStartOfReflow = false;
}
nsIAtom*
nsListControlFrame::GetType() const
{
return nsGkAtoms::listControlFrame;
}
#ifdef DEBUG_FRAME_DUMP
nsresult
nsListControlFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("ListControl"), aResult);
}
#endif
nscoord
nsListControlFrame::GetBSizeOfARow()
{
return BSizeOfARow();
}
nsresult
nsListControlFrame::IsOptionDisabled(int32_t anIndex, bool &aIsDisabled)
{
RefPtr<dom::HTMLSelectElement> sel =
dom::HTMLSelectElement::FromContent(mContent);
if (sel) {
sel->IsOptionDisabled(anIndex, &aIsDisabled);
return NS_OK;
}
return NS_ERROR_FAILURE;
}
//----------------------------------------------------------------------
// helper
//----------------------------------------------------------------------
bool
nsListControlFrame::IsLeftButton(nsIDOMEvent* aMouseEvent)
{
// only allow selection with the left button
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aMouseEvent);
if (mouseEvent) {
int16_t whichButton;
if (NS_SUCCEEDED(mouseEvent->GetButton(&whichButton))) {
return whichButton != 0?false:true;
}
}
return false;
}
nscoord
nsListControlFrame::CalcFallbackRowBSize(float aFontSizeInflation)
{
RefPtr<nsFontMetrics> fontMet =
nsLayoutUtils::GetFontMetricsForFrame(this, aFontSizeInflation);
return fontMet->MaxHeight();
}
nscoord
nsListControlFrame::CalcIntrinsicBSize(nscoord aBSizeOfARow,
int32_t aNumberOfOptions)
{
NS_PRECONDITION(!IsInDropDownMode(),
"Shouldn't be in dropdown mode when we call this");
dom::HTMLSelectElement* select =
dom::HTMLSelectElement::FromContentOrNull(mContent);
if (select) {
mNumDisplayRows = select->Size();
} else {
mNumDisplayRows = 1;
}
if (mNumDisplayRows < 1) {
mNumDisplayRows = 4;
}
return mNumDisplayRows * aBSizeOfARow;
}
//----------------------------------------------------------------------
// nsIDOMMouseListener
//----------------------------------------------------------------------
nsresult
nsListControlFrame::MouseUp(nsIDOMEvent* aMouseEvent)
{
NS_ASSERTION(aMouseEvent != nullptr, "aMouseEvent is null.");
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aMouseEvent);
NS_ENSURE_TRUE(mouseEvent, NS_ERROR_FAILURE);
UpdateInListState(aMouseEvent);
mButtonDown = false;
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
return NS_OK;
}
// only allow selection with the left button
// if a right button click is on the combobox itself
// or on the select when in listbox mode, then let the click through
if (!IsLeftButton(aMouseEvent)) {
if (IsInDropDownMode()) {
if (!IgnoreMouseEventForSelection(aMouseEvent)) {
aMouseEvent->PreventDefault();
aMouseEvent->StopPropagation();
} else {
CaptureMouseEvents(false);
return NS_OK;
}
CaptureMouseEvents(false);
return NS_ERROR_FAILURE; // means consume event
} else {
CaptureMouseEvents(false);
return NS_OK;
}
}
const nsStyleVisibility* vis = StyleVisibility();
if (!vis->IsVisible()) {
return NS_OK;
}
if (IsInDropDownMode()) {
// XXX This is a bit of a hack, but.....
// But the idea here is to make sure you get an "onclick" event when you mouse
// down on the select and the drag over an option and let go
// And then NOT get an "onclick" event when when you click down on the select
// and then up outside of the select
// the EventStateManager tracks the content of the mouse down and the mouse up
// to make sure they are the same, and the onclick is sent in the PostHandleEvent
// depeneding on whether the clickCount is non-zero.
// So we cheat here by either setting or unsetting the clcikCount in the native event
// so the right thing happens for the onclick event
WidgetMouseEvent* mouseEvent =
aMouseEvent->WidgetEventPtr()->AsMouseEvent();
int32_t selectedIndex;
if (NS_SUCCEEDED(GetIndexFromDOMEvent(aMouseEvent, selectedIndex))) {
// If it's disabled, disallow the click and leave.
bool isDisabled = false;
IsOptionDisabled(selectedIndex, isDisabled);
if (isDisabled) {
aMouseEvent->PreventDefault();
aMouseEvent->StopPropagation();
CaptureMouseEvents(false);
return NS_ERROR_FAILURE;
}
if (kNothingSelected != selectedIndex) {
nsWeakFrame weakFrame(this);
ComboboxFinish(selectedIndex);
if (!weakFrame.IsAlive())
return NS_OK;
FireOnChange();
}
mouseEvent->mClickCount = 1;
} else {
// the click was out side of the select or its dropdown
mouseEvent->mClickCount =
IgnoreMouseEventForSelection(aMouseEvent) ? 1 : 0;
}
} else {
CaptureMouseEvents(false);
// Notify
if (mChangesSinceDragStart) {
// reset this so that future MouseUps without a prior MouseDown
// won't fire onchange
mChangesSinceDragStart = false;
FireOnChange();
}
}
return NS_OK;
}
void
nsListControlFrame::UpdateInListState(nsIDOMEvent* aEvent)
{
if (!mComboboxFrame || !mComboboxFrame->IsDroppedDown())
return;
nsPoint pt = nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(aEvent, this);
nsRect borderInnerEdge = GetScrollPortRect();
if (pt.y >= borderInnerEdge.y && pt.y < borderInnerEdge.YMost()) {
mItemSelectionStarted = true;
}
}
bool nsListControlFrame::IgnoreMouseEventForSelection(nsIDOMEvent* aEvent)
{
if (!mComboboxFrame)
return false;
// Our DOM listener does get called when the dropdown is not
// showing, because it listens to events on the SELECT element
if (!mComboboxFrame->IsDroppedDown())
return true;
return !mItemSelectionStarted;
}
#ifdef ACCESSIBILITY
void
nsListControlFrame::FireMenuItemActiveEvent()
{
if (mFocused != this && !IsInDropDownMode()) {
return;
}
nsCOMPtr<nsIContent> optionContent = GetCurrentOption();
if (!optionContent) {
return;
}
FireDOMEvent(NS_LITERAL_STRING("DOMMenuItemActive"), optionContent);
}
#endif
nsresult
nsListControlFrame::GetIndexFromDOMEvent(nsIDOMEvent* aMouseEvent,
int32_t& aCurIndex)
{
if (IgnoreMouseEventForSelection(aMouseEvent))
return NS_ERROR_FAILURE;
if (nsIPresShell::GetCapturingContent() != mContent) {
// If we're not capturing, then ignore movement in the border
nsPoint pt = nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(aMouseEvent, this);
nsRect borderInnerEdge = GetScrollPortRect();
if (!borderInnerEdge.Contains(pt)) {
return NS_ERROR_FAILURE;
}
}
RefPtr<dom::HTMLOptionElement> option;
for (nsCOMPtr<nsIContent> content =
PresContext()->EventStateManager()->GetEventTargetContent(nullptr);
content && !option;
content = content->GetParent()) {
option = dom::HTMLOptionElement::FromContent(content);
}
if (option) {
aCurIndex = option->Index();
MOZ_ASSERT(aCurIndex >= 0);
return NS_OK;
}
return NS_ERROR_FAILURE;
}
static bool
FireShowDropDownEvent(nsIContent* aContent)
{
if (XRE_IsContentProcess() &&
Preferences::GetBool("browser.tabs.remote.desktopbehavior", false)) {
nsContentUtils::DispatchChromeEvent(aContent->OwnerDoc(), aContent,
NS_LITERAL_STRING("mozshowdropdown"), true,
false);
return true;
}
return false;
}
nsresult
nsListControlFrame::MouseDown(nsIDOMEvent* aMouseEvent)
{
NS_ASSERTION(aMouseEvent != nullptr, "aMouseEvent is null.");
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aMouseEvent);
NS_ENSURE_TRUE(mouseEvent, NS_ERROR_FAILURE);
UpdateInListState(aMouseEvent);
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
return NS_OK;
}
// only allow selection with the left button
// if a right button click is on the combobox itself
// or on the select when in listbox mode, then let the click through
if (!IsLeftButton(aMouseEvent)) {
if (IsInDropDownMode()) {
if (!IgnoreMouseEventForSelection(aMouseEvent)) {
aMouseEvent->PreventDefault();
aMouseEvent->StopPropagation();
} else {
return NS_OK;
}
return NS_ERROR_FAILURE; // means consume event
} else {
return NS_OK;
}
}
int32_t selectedIndex;
if (NS_SUCCEEDED(GetIndexFromDOMEvent(aMouseEvent, selectedIndex))) {
// Handle Like List
mButtonDown = true;
CaptureMouseEvents(true);
nsWeakFrame weakFrame(this);
bool change =
HandleListSelection(aMouseEvent, selectedIndex); // might destroy us
if (!weakFrame.IsAlive()) {
return NS_OK;
}
mChangesSinceDragStart = change;
} else {
// NOTE: the combo box is responsible for dropping it down
if (mComboboxFrame) {
if (FireShowDropDownEvent(mContent)) {
return NS_OK;
}
if (!IgnoreMouseEventForSelection(aMouseEvent)) {
return NS_OK;
}
if (!nsComboboxControlFrame::ToolkitHasNativePopup())
{
bool isDroppedDown = mComboboxFrame->IsDroppedDown();
nsIFrame* comboFrame = do_QueryFrame(mComboboxFrame);
nsWeakFrame weakFrame(comboFrame);
mComboboxFrame->ShowDropDown(!isDroppedDown);
if (!weakFrame.IsAlive())
return NS_OK;
if (isDroppedDown) {
CaptureMouseEvents(false);
}
}
}
}
return NS_OK;
}
//----------------------------------------------------------------------
// nsIDOMMouseMotionListener
//----------------------------------------------------------------------
nsresult
nsListControlFrame::MouseMove(nsIDOMEvent* aMouseEvent)
{
NS_ASSERTION(aMouseEvent, "aMouseEvent is null.");
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aMouseEvent);
NS_ENSURE_TRUE(mouseEvent, NS_ERROR_FAILURE);
UpdateInListState(aMouseEvent);
if (IsInDropDownMode()) {
if (mComboboxFrame->IsDroppedDown()) {
int32_t selectedIndex;
if (NS_SUCCEEDED(GetIndexFromDOMEvent(aMouseEvent, selectedIndex))) {
PerformSelection(selectedIndex, false, false); // might destroy us
}
}
} else {// XXX - temporary until we get drag events
if (mButtonDown) {
return DragMove(aMouseEvent); // might destroy us
}
}
return NS_OK;
}
nsresult
nsListControlFrame::DragMove(nsIDOMEvent* aMouseEvent)
{
NS_ASSERTION(aMouseEvent, "aMouseEvent is null.");
UpdateInListState(aMouseEvent);
if (!IsInDropDownMode()) {
int32_t selectedIndex;
if (NS_SUCCEEDED(GetIndexFromDOMEvent(aMouseEvent, selectedIndex))) {
// Don't waste cycles if we already dragged over this item
if (selectedIndex == mEndSelectionIndex) {
return NS_OK;
}
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aMouseEvent);
NS_ASSERTION(mouseEvent, "aMouseEvent is not an nsIDOMMouseEvent!");
bool isControl;
#ifdef XP_MACOSX
mouseEvent->GetMetaKey(&isControl);
#else
mouseEvent->GetCtrlKey(&isControl);
#endif
nsWeakFrame weakFrame(this);
// Turn SHIFT on when you are dragging, unless control is on.
bool wasChanged = PerformSelection(selectedIndex,
!isControl, isControl);
if (!weakFrame.IsAlive()) {
return NS_OK;
}
mChangesSinceDragStart = mChangesSinceDragStart || wasChanged;
}
}
return NS_OK;
}
//----------------------------------------------------------------------
// Scroll helpers.
//----------------------------------------------------------------------
void
nsListControlFrame::ScrollToIndex(int32_t aIndex)
{
if (aIndex < 0) {
// XXX shouldn't we just do nothing if we're asked to scroll to
// kNothingSelected?
ScrollTo(nsPoint(0, 0), nsIScrollableFrame::INSTANT);
} else {
RefPtr<dom::HTMLOptionElement> option =
GetOption(AssertedCast<uint32_t>(aIndex));
if (option) {
ScrollToFrame(*option);
}
}
}
void
nsListControlFrame::ScrollToFrame(dom::HTMLOptionElement& aOptElement)
{
// otherwise we find the content's frame and scroll to it
nsIFrame* childFrame = aOptElement.GetPrimaryFrame();
if (childFrame) {
PresContext()->PresShell()->
ScrollFrameRectIntoView(childFrame,
nsRect(nsPoint(0, 0), childFrame->GetSize()),
nsIPresShell::ScrollAxis(), nsIPresShell::ScrollAxis(),
nsIPresShell::SCROLL_OVERFLOW_HIDDEN |
nsIPresShell::SCROLL_FIRST_ANCESTOR_ONLY);
}
}
//---------------------------------------------------------------------
// Ok, the entire idea of this routine is to move to the next item that
// is suppose to be selected. If the item is disabled then we search in
// the same direction looking for the next item to select. If we run off
// the end of the list then we start at the end of the list and search
// backwards until we get back to the original item or an enabled option
//
// aStartIndex - the index to start searching from
// aNewIndex - will get set to the new index if it finds one
// aNumOptions - the total number of options in the list
// aDoAdjustInc - the initial increment 1-n
// aDoAdjustIncNext - the increment used to search for the next enabled option
//
// the aDoAdjustInc could be a "1" for a single item or
// any number greater representing a page of items
//
void
nsListControlFrame::AdjustIndexForDisabledOpt(int32_t aStartIndex,
int32_t &aNewIndex,
int32_t aNumOptions,
int32_t aDoAdjustInc,
int32_t aDoAdjustIncNext)
{
// Cannot select anything if there is nothing to select
if (aNumOptions == 0) {
aNewIndex = kNothingSelected;
return;
}
// means we reached the end of the list and now we are searching backwards
bool doingReverse = false;
// lowest index in the search range
int32_t bottom = 0;
// highest index in the search range
int32_t top = aNumOptions;
// Start off keyboard options at selectedIndex if nothing else is defaulted to
//
// XXX Perhaps this should happen for mouse too, to start off shift click
// automatically in multiple ... to do this, we'd need to override
// OnOptionSelected and set mStartSelectedIndex if nothing is selected. Not
// sure of the effects, though, so I'm not doing it just yet.
int32_t startIndex = aStartIndex;
if (startIndex < bottom) {
startIndex = GetSelectedIndex();
}
int32_t newIndex = startIndex + aDoAdjustInc;
// make sure we start off in the range
if (newIndex < bottom) {
newIndex = 0;
} else if (newIndex >= top) {
newIndex = aNumOptions-1;
}
while (1) {
// if the newIndex isn't disabled, we are golden, bail out
bool isDisabled = true;
if (NS_SUCCEEDED(IsOptionDisabled(newIndex, isDisabled)) && !isDisabled) {
break;
}
// it WAS disabled, so sart looking ahead for the next enabled option
newIndex += aDoAdjustIncNext;
// well, if we reach end reverse the search
if (newIndex < bottom) {
if (doingReverse) {
return; // if we are in reverse mode and reach the end bail out
} else {
// reset the newIndex to the end of the list we hit
// reverse the incrementer
// set the other end of the list to our original starting index
newIndex = bottom;
aDoAdjustIncNext = 1;
doingReverse = true;
top = startIndex;
}
} else if (newIndex >= top) {
if (doingReverse) {
return; // if we are in reverse mode and reach the end bail out
} else {
// reset the newIndex to the end of the list we hit
// reverse the incrementer
// set the other end of the list to our original starting index
newIndex = top - 1;
aDoAdjustIncNext = -1;
doingReverse = true;
bottom = startIndex;
}
}
}
// Looks like we found one
aNewIndex = newIndex;
}
nsAString&
nsListControlFrame::GetIncrementalString()
{
if (sIncrementalString == nullptr)
sIncrementalString = new nsString();
return *sIncrementalString;
}
void
nsListControlFrame::Shutdown()
{
delete sIncrementalString;
sIncrementalString = nullptr;
}
void
nsListControlFrame::DropDownToggleKey(nsIDOMEvent* aKeyEvent)
{
// Cocoa widgets do native popups, so don't try to show
// dropdowns there.
if (IsInDropDownMode() && !nsComboboxControlFrame::ToolkitHasNativePopup()) {
aKeyEvent->PreventDefault();
if (!mComboboxFrame->IsDroppedDown()) {
if (!FireShowDropDownEvent(mContent)) {
mComboboxFrame->ShowDropDown(true);
}
} else {
nsWeakFrame weakFrame(this);
// mEndSelectionIndex is the last item that got selected.
ComboboxFinish(mEndSelectionIndex);
if (weakFrame.IsAlive()) {
FireOnChange();
}
}
}
}
nsresult
nsListControlFrame::KeyDown(nsIDOMEvent* aKeyEvent)
{
MOZ_ASSERT(aKeyEvent, "aKeyEvent is null.");
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
return NS_OK;
}
AutoIncrementalSearchResetter incrementalSearchResetter;
// Don't check defaultPrevented value because other browsers don't prevent
// the key navigation of list control even if preventDefault() is called.
// XXXmats 2015-04-16: the above is not true anymore, Chrome prevents all
// XXXmats keyboard events, even tabbing, when preventDefault() is called
// XXXmats in onkeydown. That seems sub-optimal though.
const WidgetKeyboardEvent* keyEvent =
aKeyEvent->WidgetEventPtr()->AsKeyboardEvent();
MOZ_ASSERT(keyEvent,
"DOM event must have WidgetKeyboardEvent for its internal event");
bool dropDownMenuOnUpDown;
bool dropDownMenuOnSpace;
#ifdef XP_MACOSX
dropDownMenuOnUpDown = IsInDropDownMode() && !mComboboxFrame->IsDroppedDown();
dropDownMenuOnSpace = !keyEvent->IsAlt() && !keyEvent->IsControl() &&
!keyEvent->IsMeta();
#else
dropDownMenuOnUpDown = keyEvent->IsAlt();
dropDownMenuOnSpace = IsInDropDownMode() && !mComboboxFrame->IsDroppedDown();
#endif
if ((dropDownMenuOnUpDown &&
(keyEvent->mKeyCode == NS_VK_UP || keyEvent->mKeyCode == NS_VK_DOWN)) ||
(dropDownMenuOnSpace && keyEvent->mKeyCode == NS_VK_SPACE)) {
DropDownToggleKey(aKeyEvent);
if (keyEvent->DefaultPrevented()) {
return NS_OK;
}
}
if (keyEvent->IsAlt()) {
return NS_OK;
}
// now make sure there are options or we are wasting our time
RefPtr<dom::HTMLOptionsCollection> options = GetOptions();
NS_ENSURE_TRUE(options, NS_ERROR_FAILURE);
uint32_t numOptions = options->Length();
// this is the new index to set
int32_t newIndex = kNothingSelected;
bool isControlOrMeta = (keyEvent->IsControl() || keyEvent->IsMeta());
// Don't try to handle multiple-select pgUp/pgDown in single-select lists.
if (isControlOrMeta && !GetMultiple() &&
(keyEvent->mKeyCode == NS_VK_PAGE_UP ||
keyEvent->mKeyCode == NS_VK_PAGE_DOWN)) {
return NS_OK;
}
if (isControlOrMeta && (keyEvent->mKeyCode == NS_VK_UP ||
keyEvent->mKeyCode == NS_VK_LEFT ||
keyEvent->mKeyCode == NS_VK_DOWN ||
keyEvent->mKeyCode == NS_VK_RIGHT ||
keyEvent->mKeyCode == NS_VK_HOME ||
keyEvent->mKeyCode == NS_VK_END)) {
// Don't go into multiple-select mode unless this list can handle it.
isControlOrMeta = mControlSelectMode = GetMultiple();
} else if (keyEvent->mKeyCode != NS_VK_SPACE) {
mControlSelectMode = false;
}
switch (keyEvent->mKeyCode) {
case NS_VK_UP:
case NS_VK_LEFT:
AdjustIndexForDisabledOpt(mEndSelectionIndex, newIndex,
static_cast<int32_t>(numOptions),
-1, -1);
break;
case NS_VK_DOWN:
case NS_VK_RIGHT:
AdjustIndexForDisabledOpt(mEndSelectionIndex, newIndex,
static_cast<int32_t>(numOptions),
1, 1);
break;
case NS_VK_RETURN:
if (IsInDropDownMode()) {
if (mComboboxFrame->IsDroppedDown()) {
// If the select element is a dropdown style, Enter key should be
// consumed while the dropdown is open for security.
aKeyEvent->PreventDefault();
nsWeakFrame weakFrame(this);
ComboboxFinish(mEndSelectionIndex);
if (!weakFrame.IsAlive()) {
return NS_OK;
}
}
FireOnChange();
return NS_OK;
}
// If this is single select listbox, Enter key doesn't cause anything.
if (!GetMultiple()) {
return NS_OK;
}
newIndex = mEndSelectionIndex;
break;
case NS_VK_ESCAPE: {
// If the select element is a listbox style, Escape key causes nothing.
if (!IsInDropDownMode()) {
return NS_OK;
}
AboutToRollup();
// If the select element is a dropdown style, Enter key should be
// consumed everytime since Escape key may be pressed accidentally after
// the dropdown is closed by Escepe key.
aKeyEvent->PreventDefault();
return NS_OK;
}
case NS_VK_PAGE_UP: {
int32_t itemsPerPage =
std::max(1, static_cast<int32_t>(mNumDisplayRows - 1));
AdjustIndexForDisabledOpt(mEndSelectionIndex, newIndex,
static_cast<int32_t>(numOptions),
-itemsPerPage, -1);
break;
}
case NS_VK_PAGE_DOWN: {
int32_t itemsPerPage =
std::max(1, static_cast<int32_t>(mNumDisplayRows - 1));
AdjustIndexForDisabledOpt(mEndSelectionIndex, newIndex,
static_cast<int32_t>(numOptions),
itemsPerPage, 1);
break;
}
case NS_VK_HOME:
AdjustIndexForDisabledOpt(0, newIndex,
static_cast<int32_t>(numOptions),
0, 1);
break;
case NS_VK_END:
AdjustIndexForDisabledOpt(static_cast<int32_t>(numOptions) - 1, newIndex,
static_cast<int32_t>(numOptions),
0, -1);
break;
#if defined(XP_WIN)
case NS_VK_F4:
if (!isControlOrMeta) {
DropDownToggleKey(aKeyEvent);
}
return NS_OK;
#endif
default: // printable key will be handled by keypress event.
incrementalSearchResetter.Cancel();
return NS_OK;
}
aKeyEvent->PreventDefault();
// Actually process the new index and let the selection code
// do the scrolling for us
PostHandleKeyEvent(newIndex, 0, keyEvent->IsShift(), isControlOrMeta);
return NS_OK;
}
nsresult
nsListControlFrame::KeyPress(nsIDOMEvent* aKeyEvent)
{
MOZ_ASSERT(aKeyEvent, "aKeyEvent is null.");
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
return NS_OK;
}
AutoIncrementalSearchResetter incrementalSearchResetter;
const WidgetKeyboardEvent* keyEvent =
aKeyEvent->WidgetEventPtr()->AsKeyboardEvent();
MOZ_ASSERT(keyEvent,
"DOM event must have WidgetKeyboardEvent for its internal event");
// Select option with this as the first character
// XXX Not I18N compliant
// Don't do incremental search if the key event has already consumed.
if (keyEvent->DefaultPrevented()) {
return NS_OK;
}
if (keyEvent->IsAlt()) {
return NS_OK;
}
// With some keyboard layout, space key causes non-ASCII space.
// So, the check in keydown event handler isn't enough, we need to check it
// again with keypress event.
if (keyEvent->mCharCode != ' ') {
mControlSelectMode = false;
}
bool isControlOrMeta = (keyEvent->IsControl() || keyEvent->IsMeta());
if (isControlOrMeta && keyEvent->mCharCode != ' ') {
return NS_OK;
}
// NOTE: If mKeyCode of keypress event is not 0, mCharCode is always 0.
// Therefore, all non-printable keys are not handled after this block.
if (!keyEvent->mCharCode) {
// Backspace key will delete the last char in the string. Otherwise,
// non-printable keypress should reset incremental search.
if (keyEvent->mKeyCode == NS_VK_BACK) {
incrementalSearchResetter.Cancel();
if (!GetIncrementalString().IsEmpty()) {
GetIncrementalString().Truncate(GetIncrementalString().Length() - 1);
}
aKeyEvent->PreventDefault();
} else {
// XXX When a select element has focus, even if the key causes nothing,
// it might be better to call preventDefault() here because nobody
// should expect one of other elements including chrome handles the
// key event.
}
return NS_OK;
}
incrementalSearchResetter.Cancel();
// We ate the key if we got this far.
aKeyEvent->PreventDefault();
// XXX Why don't we check/modify timestamp first?
// Incremental Search: if time elapsed is below
// INCREMENTAL_SEARCH_KEYPRESS_TIME, append this keystroke to the search
// string we will use to find options and start searching at the current
// keystroke. Otherwise, Truncate the string if it's been a long time
// since our last keypress.
if (keyEvent->mTime - gLastKeyTime > INCREMENTAL_SEARCH_KEYPRESS_TIME) {
// If this is ' ' and we are at the beginning of the string, treat it as
// "select this option" (bug 191543)
if (keyEvent->mCharCode == ' ') {
// Actually process the new index and let the selection code
// do the scrolling for us
PostHandleKeyEvent(mEndSelectionIndex, keyEvent->mCharCode,
keyEvent->IsShift(), isControlOrMeta);
return NS_OK;
}
GetIncrementalString().Truncate();
}
gLastKeyTime = keyEvent->mTime;
// Append this keystroke to the search string.
char16_t uniChar = ToLowerCase(static_cast<char16_t>(keyEvent->mCharCode));
GetIncrementalString().Append(uniChar);
// See bug 188199, if all letters in incremental string are same, just try to
// match the first one
nsAutoString incrementalString(GetIncrementalString());
uint32_t charIndex = 1, stringLength = incrementalString.Length();
while (charIndex < stringLength &&
incrementalString[charIndex] == incrementalString[charIndex - 1]) {
charIndex++;
}
if (charIndex == stringLength) {
incrementalString.Truncate(1);
stringLength = 1;
}
// Determine where we're going to start reading the string
// If we have multiple characters to look for, we start looking *at* the
// current option. If we have only one character to look for, we start
// looking *after* the current option.
// Exception: if there is no option selected to start at, we always start
// *at* 0.
int32_t startIndex = GetSelectedIndex();
if (startIndex == kNothingSelected) {
startIndex = 0;
} else if (stringLength == 1) {
startIndex++;
}
// now make sure there are options or we are wasting our time
RefPtr<dom::HTMLOptionsCollection> options = GetOptions();
NS_ENSURE_TRUE(options, NS_ERROR_FAILURE);
uint32_t numOptions = options->Length();
nsWeakFrame weakFrame(this);
for (uint32_t i = 0; i < numOptions; ++i) {
uint32_t index = (i + startIndex) % numOptions;
RefPtr<dom::HTMLOptionElement> optionElement =
options->ItemAsOption(index);
if (!optionElement || !optionElement->GetPrimaryFrame()) {
continue;
}
nsAutoString text;
if (NS_FAILED(optionElement->GetText(text)) ||
!StringBeginsWith(
nsContentUtils::TrimWhitespace<
nsContentUtils::IsHTMLWhitespaceOrNBSP>(text, false),
incrementalString, nsCaseInsensitiveStringComparator())) {
continue;
}
bool wasChanged = PerformSelection(index, keyEvent->IsShift(), isControlOrMeta);
if (!weakFrame.IsAlive()) {
return NS_OK;
}
if (!wasChanged) {
break;
}
// If UpdateSelection() returns false, that means the frame is no longer
// alive. We should stop doing anything.
if (!UpdateSelection()) {
return NS_OK;
}
break;
}
return NS_OK;
}
void
nsListControlFrame::PostHandleKeyEvent(int32_t aNewIndex,
uint32_t aCharCode,
bool aIsShift,
bool aIsControlOrMeta)
{
if (aNewIndex == kNothingSelected) {
return;
}
// If you hold control, but not shift, no key will actually do anything
// except space.
nsWeakFrame weakFrame(this);
bool wasChanged = false;
if (aIsControlOrMeta && !aIsShift && aCharCode != ' ') {
mStartSelectionIndex = aNewIndex;
mEndSelectionIndex = aNewIndex;
InvalidateFocus();
ScrollToIndex(aNewIndex);
if (!weakFrame.IsAlive()) {
return;
}
#ifdef ACCESSIBILITY
FireMenuItemActiveEvent();
#endif
} else if (mControlSelectMode && aCharCode == ' ') {
wasChanged = SingleSelection(aNewIndex, true);
} else {
wasChanged = PerformSelection(aNewIndex, aIsShift, aIsControlOrMeta);
}
if (wasChanged && weakFrame.IsAlive()) {
// dispatch event, update combobox, etc.
UpdateSelection();
}
}
/******************************************************************************
* nsListEventListener
*****************************************************************************/
NS_IMPL_ISUPPORTS(nsListEventListener, nsIDOMEventListener)
NS_IMETHODIMP
nsListEventListener::HandleEvent(nsIDOMEvent* aEvent)
{
if (!mFrame)
return NS_OK;
nsAutoString eventType;
aEvent->GetType(eventType);
if (eventType.EqualsLiteral("keydown")) {
return mFrame->nsListControlFrame::KeyDown(aEvent);
}
if (eventType.EqualsLiteral("keypress")) {
return mFrame->nsListControlFrame::KeyPress(aEvent);
}
if (eventType.EqualsLiteral("mousedown")) {
bool defaultPrevented = false;
aEvent->GetDefaultPrevented(&defaultPrevented);
if (defaultPrevented) {
return NS_OK;
}
return mFrame->nsListControlFrame::MouseDown(aEvent);
}
if (eventType.EqualsLiteral("mouseup")) {
// Don't try to honor defaultPrevented here - it's not web compatible.
// (bug 1194733)
return mFrame->nsListControlFrame::MouseUp(aEvent);
}
if (eventType.EqualsLiteral("mousemove")) {
// I don't think we want to honor defaultPrevented on mousemove
// in general, and it would only prevent highlighting here.
return mFrame->nsListControlFrame::MouseMove(aEvent);
}
NS_ABORT();
return NS_OK;
}
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