forked from mirrors/gecko-dev
401 lines
14 KiB
C++
401 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsHTMLButtonControlFrame.h"
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#include "nsContainerFrame.h"
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#include "nsIFormControlFrame.h"
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#include "nsPresContext.h"
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#include "nsGkAtoms.h"
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#include "nsButtonFrameRenderer.h"
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#include "nsCSSAnonBoxes.h"
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#include "nsFormControlFrame.h"
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#include "nsNameSpaceManager.h"
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#include "nsStyleSet.h"
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#include "nsDisplayList.h"
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#include <algorithm>
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using namespace mozilla;
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nsContainerFrame*
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NS_NewHTMLButtonControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsHTMLButtonControlFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsHTMLButtonControlFrame)
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nsHTMLButtonControlFrame::nsHTMLButtonControlFrame(nsStyleContext* aContext)
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: nsContainerFrame(aContext)
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{
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}
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nsHTMLButtonControlFrame::~nsHTMLButtonControlFrame()
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{
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}
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void
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nsHTMLButtonControlFrame::DestroyFrom(nsIFrame* aDestructRoot)
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{
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nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);
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nsContainerFrame::DestroyFrom(aDestructRoot);
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}
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void
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nsHTMLButtonControlFrame::Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
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mRenderer.SetFrame(this, PresContext());
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}
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NS_QUERYFRAME_HEAD(nsHTMLButtonControlFrame)
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NS_QUERYFRAME_ENTRY(nsIFormControlFrame)
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NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
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#ifdef ACCESSIBILITY
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a11y::AccType
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nsHTMLButtonControlFrame::AccessibleType()
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{
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return a11y::eHTMLButtonType;
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}
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#endif
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nsIAtom*
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nsHTMLButtonControlFrame::GetType() const
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{
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return nsGkAtoms::HTMLButtonControlFrame;
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}
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void
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nsHTMLButtonControlFrame::SetFocus(bool aOn, bool aRepaint)
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{
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}
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nsresult
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nsHTMLButtonControlFrame::HandleEvent(nsPresContext* aPresContext,
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WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus)
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{
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// if disabled do nothing
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if (mRenderer.isDisabled()) {
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return NS_OK;
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}
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// mouse clicks are handled by content
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// we don't want our children to get any events. So just pass it to frame.
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return nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
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}
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void
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nsHTMLButtonControlFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists)
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{
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nsDisplayList onTop;
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if (IsVisibleForPainting(aBuilder)) {
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mRenderer.DisplayButton(aBuilder, aLists.BorderBackground(), &onTop);
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}
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nsDisplayListCollection set;
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// Do not allow the child subtree to receive events.
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if (!aBuilder->IsForEventDelivery()) {
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DisplayListClipState::AutoSaveRestore clipState(aBuilder);
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if (IsInput() || StyleDisplay()->mOverflowX != NS_STYLE_OVERFLOW_VISIBLE) {
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nsMargin border = StyleBorder()->GetComputedBorder();
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nsRect rect(aBuilder->ToReferenceFrame(this), GetSize());
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rect.Deflate(border);
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nscoord radii[8];
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bool hasRadii = GetPaddingBoxBorderRadii(radii);
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clipState.ClipContainingBlockDescendants(rect, hasRadii ? radii : nullptr);
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}
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BuildDisplayListForChild(aBuilder, mFrames.FirstChild(), aDirtyRect, set,
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DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT);
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// That should put the display items in set.Content()
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}
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// Put the foreground outline and focus rects on top of the children
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set.Content()->AppendToTop(&onTop);
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set.MoveTo(aLists);
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DisplayOutline(aBuilder, aLists);
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// to draw border when selected in editor
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DisplaySelectionOverlay(aBuilder, aLists.Content());
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}
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nscoord
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nsHTMLButtonControlFrame::GetMinWidth(nsRenderingContext* aRenderingContext)
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{
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nscoord result;
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DISPLAY_MIN_WIDTH(this, result);
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nsIFrame* kid = mFrames.FirstChild();
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result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
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kid,
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nsLayoutUtils::MIN_WIDTH);
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result += mRenderer.GetAddedButtonBorderAndPadding().LeftRight();
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return result;
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}
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nscoord
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nsHTMLButtonControlFrame::GetPrefWidth(nsRenderingContext* aRenderingContext)
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{
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nscoord result;
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DISPLAY_PREF_WIDTH(this, result);
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nsIFrame* kid = mFrames.FirstChild();
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result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
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kid,
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nsLayoutUtils::PREF_WIDTH);
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result += mRenderer.GetAddedButtonBorderAndPadding().LeftRight();
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return result;
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}
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void
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nsHTMLButtonControlFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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DO_GLOBAL_REFLOW_COUNT("nsHTMLButtonControlFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
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NS_PRECONDITION(aReflowState.ComputedWidth() != NS_INTRINSICSIZE,
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"Should have real computed width by now");
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if (mState & NS_FRAME_FIRST_REFLOW) {
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nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), true);
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}
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// Reflow the child
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nsIFrame* firstKid = mFrames.FirstChild();
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MOZ_ASSERT(firstKid, "Button should have a child frame for its contents");
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MOZ_ASSERT(!firstKid->GetNextSibling(),
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"Button should have exactly one child frame");
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MOZ_ASSERT(firstKid->StyleContext()->GetPseudo() ==
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nsCSSAnonBoxes::buttonContent,
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"Button's child frame has unexpected pseudo type!");
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// XXXbz Eventually we may want to check-and-bail if
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// !aReflowState.ShouldReflowAllKids() &&
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// !NS_SUBTREE_DIRTY(firstKid).
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// We'd need to cache our ascent for that, of course.
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// Reflow the contents of the button.
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// (This populates our aDesiredSize, too.)
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ReflowButtonContents(aPresContext, aDesiredSize,
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aReflowState, firstKid);
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ConsiderChildOverflow(aDesiredSize.mOverflowAreas, firstKid);
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aStatus = NS_FRAME_COMPLETE;
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FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize,
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aReflowState, aStatus);
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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}
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// Helper-function that lets us clone the button's reflow state, but with its
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// ComputedWidth and ComputedHeight reduced by the amount of renderer-specific
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// focus border and padding that we're using. (This lets us provide a more
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// appropriate content-box size for descendents' percent sizes to resolve
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// against.)
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static nsHTMLReflowState
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CloneReflowStateWithReducedContentBox(
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const nsHTMLReflowState& aButtonReflowState,
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const nsMargin& aFocusPadding)
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{
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nscoord adjustedWidth =
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aButtonReflowState.ComputedWidth() - aFocusPadding.LeftRight();
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adjustedWidth = std::max(0, adjustedWidth);
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// (Only adjust height if it's an actual length.)
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nscoord adjustedHeight = aButtonReflowState.ComputedHeight();
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if (adjustedHeight != NS_INTRINSICSIZE) {
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adjustedHeight -= aFocusPadding.TopBottom();
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adjustedHeight = std::max(0, adjustedHeight);
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}
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nsHTMLReflowState clone(aButtonReflowState);
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clone.SetComputedWidth(adjustedWidth);
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clone.SetComputedHeight(adjustedHeight);
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return clone;
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}
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void
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nsHTMLButtonControlFrame::ReflowButtonContents(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aButtonDesiredSize,
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const nsHTMLReflowState& aButtonReflowState,
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nsIFrame* aFirstKid)
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{
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// Buttons have some bonus renderer-determined border/padding,
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// which occupies part of the button's content-box area:
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const nsMargin focusPadding = mRenderer.GetAddedButtonBorderAndPadding();
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nsSize availSize(aButtonReflowState.ComputedWidth(), NS_INTRINSICSIZE);
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// Indent the child inside us by the focus border. We must do this separate
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// from the regular border.
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availSize.width -= focusPadding.LeftRight();
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// See whether out availSize's width is big enough. If it's smaller than our
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// intrinsic min width, that means that the kid wouldn't really fit; for a
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// better look in such cases we adjust the available width and our left
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// offset to allow the kid to spill left into our padding.
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nscoord xoffset = focusPadding.left +
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aButtonReflowState.ComputedPhysicalBorderPadding().left;
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nscoord extrawidth = GetMinWidth(aButtonReflowState.rendContext) -
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aButtonReflowState.ComputedWidth();
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if (extrawidth > 0) {
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nscoord extraleft = extrawidth / 2;
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nscoord extraright = extrawidth - extraleft;
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NS_ASSERTION(extraright >=0, "How'd that happen?");
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// Do not allow the extras to be bigger than the relevant padding
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extraleft = std::min(extraleft, aButtonReflowState.ComputedPhysicalPadding().left);
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extraright = std::min(extraright, aButtonReflowState.ComputedPhysicalPadding().right);
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xoffset -= extraleft;
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availSize.width += extraleft + extraright;
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}
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availSize.width = std::max(availSize.width,0);
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// Give child a clone of the button's reflow state, with height/width reduced
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// by focusPadding, so that descendants with height:100% don't protrude.
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nsHTMLReflowState adjustedButtonReflowState =
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CloneReflowStateWithReducedContentBox(aButtonReflowState, focusPadding);
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nsHTMLReflowState contentsReflowState(aPresContext,
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adjustedButtonReflowState,
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aFirstKid, availSize);
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nsReflowStatus contentsReflowStatus;
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nsHTMLReflowMetrics contentsDesiredSize(aButtonReflowState);
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ReflowChild(aFirstKid, aPresContext,
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contentsDesiredSize, contentsReflowState,
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xoffset,
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focusPadding.top + aButtonReflowState.ComputedPhysicalBorderPadding().top,
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0, contentsReflowStatus);
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MOZ_ASSERT(NS_FRAME_IS_COMPLETE(contentsReflowStatus),
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"We gave button-contents frame unconstrained available height, "
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"so it should be complete");
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// Compute the button's content-box height:
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nscoord buttonContentBoxHeight = 0;
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if (aButtonReflowState.ComputedHeight() != NS_INTRINSICSIZE) {
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// Button has a fixed height -- that's its content-box height.
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buttonContentBoxHeight = aButtonReflowState.ComputedHeight();
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} else {
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// Button is intrinsically sized -- it should shrinkwrap the
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// button-contents' height, plus any focus-padding space:
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buttonContentBoxHeight =
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contentsDesiredSize.Height() + focusPadding.TopBottom();
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// Make sure we obey min/max-height in the case when we're doing intrinsic
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// sizing (we get it for free when we have a non-intrinsic
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// aButtonReflowState.ComputedHeight()). Note that we do this before
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// adjusting for borderpadding, since mComputedMaxHeight and
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// mComputedMinHeight are content heights.
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buttonContentBoxHeight =
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NS_CSS_MINMAX(buttonContentBoxHeight,
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aButtonReflowState.ComputedMinHeight(),
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aButtonReflowState.ComputedMaxHeight());
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}
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// Center child vertically in the button
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// (technically, inside of the button's focus-padding area)
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nscoord extraSpace =
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buttonContentBoxHeight - focusPadding.TopBottom() -
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contentsDesiredSize.Height();
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nscoord yoffset = std::max(0, extraSpace / 2);
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// Adjust yoffset to be in terms of the button's frame-rect, instead of
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// its focus-padding rect:
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yoffset += focusPadding.top + aButtonReflowState.ComputedPhysicalBorderPadding().top;
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// Place the child
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FinishReflowChild(aFirstKid, aPresContext,
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contentsDesiredSize, &contentsReflowState,
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xoffset, yoffset, 0);
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// Make sure we have a useful 'ascent' value for the child
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if (contentsDesiredSize.BlockStartAscent() ==
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nsHTMLReflowMetrics::ASK_FOR_BASELINE) {
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WritingMode wm = aButtonReflowState.GetWritingMode();
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contentsDesiredSize.SetBlockStartAscent(aFirstKid->GetLogicalBaseline(wm));
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}
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// OK, we're done with the child frame.
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// Use what we learned to populate the button frame's reflow metrics.
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// * Button's height & width are content-box size + border-box contribution:
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aButtonDesiredSize.Width() = aButtonReflowState.ComputedWidth() +
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aButtonReflowState.ComputedPhysicalBorderPadding().LeftRight();
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aButtonDesiredSize.Height() = buttonContentBoxHeight +
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aButtonReflowState.ComputedPhysicalBorderPadding().TopBottom();
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// * Button's ascent is its child's ascent, plus the child's y-offset
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// within our frame:
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aButtonDesiredSize.SetBlockStartAscent(contentsDesiredSize.BlockStartAscent() +
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yoffset);
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aButtonDesiredSize.SetOverflowAreasToDesiredBounds();
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}
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nsresult nsHTMLButtonControlFrame::SetFormProperty(nsIAtom* aName, const nsAString& aValue)
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{
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if (nsGkAtoms::value == aName) {
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return mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::value,
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aValue, true);
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}
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return NS_OK;
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}
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nsStyleContext*
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nsHTMLButtonControlFrame::GetAdditionalStyleContext(int32_t aIndex) const
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{
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return mRenderer.GetStyleContext(aIndex);
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}
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void
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nsHTMLButtonControlFrame::SetAdditionalStyleContext(int32_t aIndex,
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nsStyleContext* aStyleContext)
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{
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mRenderer.SetStyleContext(aIndex, aStyleContext);
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}
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#ifdef DEBUG
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void
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nsHTMLButtonControlFrame::AppendFrames(ChildListID aListID,
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nsFrameList& aFrameList)
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{
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MOZ_CRASH("unsupported operation");
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}
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void
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nsHTMLButtonControlFrame::InsertFrames(ChildListID aListID,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList)
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{
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MOZ_CRASH("unsupported operation");
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}
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void
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nsHTMLButtonControlFrame::RemoveFrame(ChildListID aListID,
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nsIFrame* aOldFrame)
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{
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MOZ_CRASH("unsupported operation");
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}
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#endif
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