forked from mirrors/gecko-dev
1427 lines
54 KiB
C++
1427 lines
54 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape Public License
|
|
* Version 1.0 (the "License"); you may not use this file except in
|
|
* compliance with the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS"
|
|
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
|
|
* the License for the specific language governing rights and limitations
|
|
* under the License.
|
|
*
|
|
* The Original Code is Mozilla Communicator client code.
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape Communications
|
|
* Corporation. Portions created by Netscape are Copyright (C) 1998
|
|
* Netscape Communications Corporation. All Rights Reserved.
|
|
*/
|
|
#include "nsCOMPtr.h"
|
|
#include "nsIStyleContext.h"
|
|
#include "nsStyleConsts.h"
|
|
#include "nsFrame.h"
|
|
#include "nsIHTMLReflow.h"
|
|
#include "nsIContent.h"
|
|
#include "nsHTMLAtoms.h"
|
|
#include "nsIPresContext.h"
|
|
#include "nsIPresShell.h"
|
|
#include "nsLayoutAtoms.h"
|
|
#include "nsIRenderingContext.h"
|
|
|
|
#ifdef NS_DEBUG
|
|
#undef NOISY_VERTICAL_ALIGN
|
|
#else
|
|
#undef NOISY_VERTICAL_ALIGN
|
|
#endif
|
|
|
|
// Initialize a <b>root</b> reflow state with a rendering context to
|
|
// use for measuring things.
|
|
nsHTMLReflowState::nsHTMLReflowState(nsIPresContext& aPresContext,
|
|
nsIFrame* aFrame,
|
|
nsReflowReason aReason,
|
|
nsIRenderingContext* aRenderingContext,
|
|
const nsSize& aAvailableSpace)
|
|
{
|
|
NS_PRECONDITION(nsnull != aRenderingContext, "no rendering context");
|
|
|
|
parentReflowState = nsnull;
|
|
frame = aFrame;
|
|
reason = aReason;
|
|
reflowCommand = nsnull;
|
|
availableWidth = aAvailableSpace.width;
|
|
availableHeight = aAvailableSpace.height;
|
|
rendContext = aRenderingContext;
|
|
spaceManager = nsnull;
|
|
lineLayout = nsnull;
|
|
isTopOfPage = PR_FALSE;
|
|
Init(aPresContext);
|
|
}
|
|
|
|
// Initialize a <b>root</b> reflow state for an <b>incremental</b>
|
|
// reflow.
|
|
nsHTMLReflowState::nsHTMLReflowState(nsIPresContext& aPresContext,
|
|
nsIFrame* aFrame,
|
|
nsIReflowCommand& aReflowCommand,
|
|
nsIRenderingContext* aRenderingContext,
|
|
const nsSize& aAvailableSpace)
|
|
{
|
|
NS_PRECONDITION(nsnull != aRenderingContext, "no rendering context");
|
|
|
|
parentReflowState = nsnull;
|
|
frame = aFrame;
|
|
reason = eReflowReason_Incremental;
|
|
reflowCommand = &aReflowCommand;
|
|
availableWidth = aAvailableSpace.width;
|
|
availableHeight = aAvailableSpace.height;
|
|
rendContext = aRenderingContext;
|
|
spaceManager = nsnull;
|
|
lineLayout = nsnull;
|
|
isTopOfPage = PR_FALSE;
|
|
Init(aPresContext);
|
|
}
|
|
|
|
// Initialize a reflow state for a child frames reflow. Some state
|
|
// is copied from the parent reflow state; the remaining state is
|
|
// computed.
|
|
nsHTMLReflowState::nsHTMLReflowState(nsIPresContext& aPresContext,
|
|
const nsHTMLReflowState& aParentReflowState,
|
|
nsIFrame* aFrame,
|
|
const nsSize& aAvailableSpace,
|
|
nsReflowReason aReason)
|
|
{
|
|
parentReflowState = &aParentReflowState;
|
|
frame = aFrame;
|
|
reason = aReason;
|
|
reflowCommand = (reason == eReflowReason_Incremental)
|
|
? aParentReflowState.reflowCommand
|
|
: nsnull;
|
|
availableWidth = aAvailableSpace.width;
|
|
availableHeight = aAvailableSpace.height;
|
|
|
|
rendContext = aParentReflowState.rendContext;
|
|
spaceManager = aParentReflowState.spaceManager;
|
|
lineLayout = aParentReflowState.lineLayout;
|
|
isTopOfPage = aParentReflowState.isTopOfPage;
|
|
|
|
Init(aPresContext);
|
|
}
|
|
|
|
// Same as the previous except that the reason is taken from the
|
|
// parent's reflow state.
|
|
nsHTMLReflowState::nsHTMLReflowState(nsIPresContext& aPresContext,
|
|
const nsHTMLReflowState& aParentReflowState,
|
|
nsIFrame* aFrame,
|
|
const nsSize& aAvailableSpace)
|
|
{
|
|
parentReflowState = &aParentReflowState;
|
|
frame = aFrame;
|
|
reason = aParentReflowState.reason;
|
|
reflowCommand = aParentReflowState.reflowCommand;
|
|
availableWidth = aAvailableSpace.width;
|
|
availableHeight = aAvailableSpace.height;
|
|
|
|
rendContext = aParentReflowState.rendContext;
|
|
spaceManager = aParentReflowState.spaceManager;
|
|
lineLayout = aParentReflowState.lineLayout;
|
|
isTopOfPage = aParentReflowState.isTopOfPage;
|
|
|
|
Init(aPresContext);
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::Init(nsIPresContext& aPresContext)
|
|
{
|
|
mCompactMarginWidth = 0;
|
|
mAlignCharOffset = 0;
|
|
mUseAlignCharOffset = 0;
|
|
|
|
frame->GetStyleData(eStyleStruct_Position,
|
|
(const nsStyleStruct*&)mStylePosition);
|
|
frame->GetStyleData(eStyleStruct_Display,
|
|
(const nsStyleStruct*&)mStyleDisplay);
|
|
frame->GetStyleData(eStyleStruct_Spacing,
|
|
(const nsStyleStruct*&)mStyleSpacing);
|
|
frameType = DetermineFrameType(frame, mStylePosition, mStyleDisplay);
|
|
InitConstraints(aPresContext);
|
|
}
|
|
|
|
PRBool
|
|
nsHTMLReflowState::HaveFixedContentWidth() const
|
|
{
|
|
const nsStylePosition* pos;
|
|
frame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)pos);
|
|
// What about 'inherit'?
|
|
return eStyleUnit_Auto != pos->mWidth.GetUnit();
|
|
}
|
|
|
|
PRBool
|
|
nsHTMLReflowState::HaveFixedContentHeight() const
|
|
{
|
|
const nsStylePosition* pos;
|
|
frame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)pos);
|
|
// What about 'inherit'?
|
|
return eStyleUnit_Auto != pos->mHeight.GetUnit();
|
|
}
|
|
|
|
const nsHTMLReflowState*
|
|
nsHTMLReflowState::GetContainingBlockReflowState(const nsReflowState* aParentRS)
|
|
{
|
|
while (nsnull != aParentRS) {
|
|
if (nsnull != aParentRS->frame) {
|
|
PRBool isContainingBlock;
|
|
// XXX This needs to go and we need to start using the info in the
|
|
// reflow state...
|
|
nsresult rv = aParentRS->frame->IsPercentageBase(isContainingBlock);
|
|
if (NS_SUCCEEDED(rv) && isContainingBlock) {
|
|
return (const nsHTMLReflowState*) aParentRS;
|
|
}
|
|
}
|
|
aParentRS = aParentRS->parentReflowState;
|
|
}
|
|
return nsnull;
|
|
}
|
|
|
|
const nsHTMLReflowState*
|
|
nsHTMLReflowState::GetPageBoxReflowState(const nsReflowState* aParentRS)
|
|
{
|
|
// XXX write me as soon as we can ask a frame if it's a page frame...
|
|
return nsnull;
|
|
}
|
|
|
|
nscoord
|
|
nsHTMLReflowState::GetContainingBlockContentWidth(const nsReflowState* aParentRS)
|
|
{
|
|
nscoord width = 0;
|
|
const nsHTMLReflowState* rs =
|
|
GetContainingBlockReflowState(aParentRS);
|
|
if (nsnull != rs) {
|
|
return ((nsHTMLReflowState*)aParentRS)->computedWidth;/* XXX cast */
|
|
}
|
|
return width;
|
|
}
|
|
|
|
nsCSSFrameType
|
|
nsHTMLReflowState::DetermineFrameType(nsIFrame* aFrame)
|
|
{
|
|
const nsStylePosition* stylePosition;
|
|
aFrame->GetStyleData(eStyleStruct_Position,
|
|
(const nsStyleStruct*&)stylePosition);
|
|
const nsStyleDisplay* styleDisplay;
|
|
aFrame->GetStyleData(eStyleStruct_Display,
|
|
(const nsStyleStruct*&)styleDisplay);
|
|
return DetermineFrameType(aFrame, stylePosition, styleDisplay);
|
|
}
|
|
|
|
nsCSSFrameType
|
|
nsHTMLReflowState::DetermineFrameType(nsIFrame* aFrame,
|
|
const nsStylePosition* aPosition,
|
|
const nsStyleDisplay* aDisplay)
|
|
{
|
|
nsCSSFrameType frameType;
|
|
|
|
// Section 9.7 of the CSS2 spec indicates that absolute position
|
|
// takes precedence over float which takes precedence over display.
|
|
if (aPosition->IsAbsolutelyPositioned()) {
|
|
frameType = NS_CSS_FRAME_TYPE_ABSOLUTE;
|
|
}
|
|
else if (NS_STYLE_FLOAT_NONE != aDisplay->mFloats) {
|
|
frameType = NS_CSS_FRAME_TYPE_FLOATING;
|
|
}
|
|
else {
|
|
switch (aDisplay->mDisplay) {
|
|
case NS_STYLE_DISPLAY_BLOCK:
|
|
case NS_STYLE_DISPLAY_LIST_ITEM:
|
|
case NS_STYLE_DISPLAY_TABLE:
|
|
frameType = NS_CSS_FRAME_TYPE_BLOCK;
|
|
break;
|
|
|
|
case NS_STYLE_DISPLAY_INLINE:
|
|
case NS_STYLE_DISPLAY_MARKER:
|
|
case NS_STYLE_DISPLAY_INLINE_TABLE:
|
|
frameType = NS_CSS_FRAME_TYPE_INLINE;
|
|
break;
|
|
|
|
case NS_STYLE_DISPLAY_RUN_IN:
|
|
case NS_STYLE_DISPLAY_COMPACT:
|
|
// XXX need to look ahead at the frame's sibling
|
|
frameType = NS_CSS_FRAME_TYPE_BLOCK;
|
|
break;
|
|
|
|
case NS_STYLE_DISPLAY_TABLE_CELL:
|
|
case NS_STYLE_DISPLAY_TABLE_CAPTION:
|
|
case NS_STYLE_DISPLAY_TABLE_ROW_GROUP:
|
|
case NS_STYLE_DISPLAY_TABLE_COLUMN:
|
|
case NS_STYLE_DISPLAY_TABLE_COLUMN_GROUP:
|
|
case NS_STYLE_DISPLAY_TABLE_HEADER_GROUP:
|
|
case NS_STYLE_DISPLAY_TABLE_FOOTER_GROUP:
|
|
case NS_STYLE_DISPLAY_TABLE_ROW:
|
|
frameType = NS_CSS_FRAME_TYPE_INTERNAL_TABLE;
|
|
break;
|
|
|
|
case NS_STYLE_DISPLAY_NONE:
|
|
default:
|
|
frameType = NS_CSS_FRAME_TYPE_UNKNOWN;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// See if the frame is replaced
|
|
nsFrameState frameState;
|
|
aFrame->GetFrameState(&frameState);
|
|
if (frameState & NS_FRAME_REPLACED_ELEMENT) {
|
|
frameType = NS_FRAME_REPLACED(frameType);
|
|
}
|
|
|
|
return frameType;
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputeRelativeOffsets(const nsHTMLReflowState* cbrs)
|
|
{
|
|
nsStyleCoord coord;
|
|
const nsHTMLReflowState* pcbrs = nsnull;
|
|
|
|
// If any of the offsets are 'inherit' we need to find the positioned
|
|
// containing block
|
|
if ((eStyleUnit_Inherit == mStylePosition->mOffset.GetLeftUnit()) ||
|
|
(eStyleUnit_Inherit == mStylePosition->mOffset.GetTopUnit()) ||
|
|
(eStyleUnit_Inherit == mStylePosition->mOffset.GetRightUnit()) ||
|
|
(eStyleUnit_Inherit == mStylePosition->mOffset.GetBottomUnit())) {
|
|
|
|
pcbrs = cbrs;
|
|
|
|
while (nsnull != pcbrs) {
|
|
const nsStylePosition* pcbrsPosition;
|
|
pcbrs->frame->GetStyleData(eStyleStruct_Position,
|
|
(const nsStyleStruct*&)pcbrsPosition);
|
|
|
|
if ((NS_STYLE_POSITION_ABSOLUTE == pcbrsPosition->mPosition) ||
|
|
(NS_STYLE_POSITION_RELATIVE == pcbrsPosition->mPosition)) {
|
|
break;
|
|
}
|
|
|
|
pcbrs = (const nsHTMLReflowState*)pcbrs->parentReflowState; // XXX cast
|
|
}
|
|
}
|
|
|
|
// Compute the 'left' and 'right' values. 'Left' moves the boxes to the right,
|
|
// and 'right' moves the boxes to the left. The computed values are always:
|
|
// left=-right
|
|
PRBool leftIsAuto = eStyleUnit_Auto == mStylePosition->mOffset.GetLeftUnit();
|
|
PRBool rightIsAuto = eStyleUnit_Auto == mStylePosition->mOffset.GetRightUnit();
|
|
|
|
// Check for percentage based values and an unconstrained containing
|
|
// block width. Treat them like 'auto'
|
|
if (NS_UNCONSTRAINEDSIZE == cbrs->computedWidth) {
|
|
if (eStyleUnit_Percent == mStylePosition->mOffset.GetLeftUnit()) {
|
|
leftIsAuto = PR_TRUE;
|
|
}
|
|
if (eStyleUnit_Percent == mStylePosition->mOffset.GetRightUnit()) {
|
|
rightIsAuto = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
// If neither 'left' not 'right' are auto, then we're over-constrained and
|
|
// we ignore one of them
|
|
if (!leftIsAuto && !rightIsAuto) {
|
|
const nsStyleDisplay* display;
|
|
frame->GetStyleData(eStyleStruct_Display, (const nsStyleStruct*&)display);
|
|
|
|
if (NS_STYLE_DIRECTION_LTR == display->mDirection) {
|
|
rightIsAuto = PR_TRUE;
|
|
} else {
|
|
leftIsAuto = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
if (leftIsAuto) {
|
|
if (rightIsAuto) {
|
|
// If both are 'auto' (their initial values), the computed values are 0
|
|
computedOffsets.left = computedOffsets.right = 0;
|
|
} else {
|
|
// 'Right' isn't 'auto' so compute its value
|
|
if (eStyleUnit_Inherit == mStylePosition->mOffset.GetRightUnit()) {
|
|
computedOffsets.right = pcbrs ? pcbrs->computedOffsets.right : 0;
|
|
} else {
|
|
ComputeHorizontalValue(cbrs->computedWidth, mStylePosition->mOffset.GetRightUnit(),
|
|
mStylePosition->mOffset.GetRight(coord),
|
|
computedOffsets.right);
|
|
}
|
|
|
|
// Computed value for 'left' is minus the value of 'right'
|
|
computedOffsets.left = -computedOffsets.right;
|
|
}
|
|
|
|
} else {
|
|
NS_ASSERTION(rightIsAuto, "unexpected specified constraint");
|
|
|
|
// 'Left' isn't 'auto' so compute its value
|
|
if (eStyleUnit_Inherit == mStylePosition->mOffset.GetLeftUnit()) {
|
|
computedOffsets.left = pcbrs ? pcbrs->computedOffsets.left : 0;
|
|
} else {
|
|
ComputeHorizontalValue(cbrs->computedWidth, mStylePosition->mOffset.GetLeftUnit(),
|
|
mStylePosition->mOffset.GetLeft(coord),
|
|
computedOffsets.left);
|
|
}
|
|
|
|
// Computed value for 'right' is minus the value of 'left'
|
|
computedOffsets.right = -computedOffsets.left;
|
|
}
|
|
|
|
// Compute the 'top' and 'bottom' values. The 'top' and 'bottom' properties
|
|
// move relatively positioned elements up and down. They also must be each
|
|
// other's negative
|
|
PRBool topIsAuto = eStyleUnit_Auto == mStylePosition->mOffset.GetTopUnit();
|
|
PRBool bottomIsAuto = eStyleUnit_Auto == mStylePosition->mOffset.GetBottomUnit();
|
|
|
|
// Check for percentage based values and a containing block height that
|
|
// depends on the content height. Treat them like 'auto'
|
|
if (NS_AUTOHEIGHT == cbrs->computedHeight) {
|
|
if (eStyleUnit_Percent == mStylePosition->mOffset.GetTopUnit()) {
|
|
topIsAuto = PR_TRUE;
|
|
}
|
|
if (eStyleUnit_Percent == mStylePosition->mOffset.GetBottomUnit()) {
|
|
bottomIsAuto = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
// If neither is 'auto', 'bottom' is ignored
|
|
if (!topIsAuto && !bottomIsAuto) {
|
|
bottomIsAuto = PR_TRUE;
|
|
}
|
|
|
|
if (topIsAuto) {
|
|
if (bottomIsAuto) {
|
|
// If both are 'auto' (their initial values), the computed values are 0
|
|
computedOffsets.top = computedOffsets.bottom = 0;
|
|
} else {
|
|
// 'Bottom' isn't 'auto' so compute its value
|
|
if (eStyleUnit_Inherit == mStylePosition->mOffset.GetBottomUnit()) {
|
|
computedOffsets.bottom = pcbrs ? pcbrs->computedOffsets.bottom : 0;
|
|
} else {
|
|
ComputeVerticalValue(cbrs->computedHeight, mStylePosition->mOffset.GetBottomUnit(),
|
|
mStylePosition->mOffset.GetBottom(coord),
|
|
computedOffsets.bottom);
|
|
}
|
|
|
|
// Computed value for 'top' is minus the value of 'bottom'
|
|
computedOffsets.top = -computedOffsets.bottom;
|
|
}
|
|
|
|
} else {
|
|
NS_ASSERTION(bottomIsAuto, "unexpected specified constraint");
|
|
|
|
// 'Top' isn't 'auto' so compute its value
|
|
if (eStyleUnit_Inherit == mStylePosition->mOffset.GetTopUnit()) {
|
|
computedOffsets.top = pcbrs ? pcbrs->computedOffsets.top : 0;
|
|
} else {
|
|
ComputeVerticalValue(cbrs->computedHeight, mStylePosition->mOffset.GetTopUnit(),
|
|
mStylePosition->mOffset.GetTop(coord),
|
|
computedOffsets.top);
|
|
}
|
|
|
|
// Computed value for 'bottom' is minus the value of 'top'
|
|
computedOffsets.bottom = -computedOffsets.top;
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::InitAbsoluteConstraints(nsIPresContext& aPresContext,
|
|
const nsHTMLReflowState* cbrs,
|
|
nscoord containingBlockWidth,
|
|
nscoord containingBlockHeight)
|
|
{
|
|
// If any of the offsets are 'auto', then get the placeholder frame
|
|
// and compute its origin relative to the containing block
|
|
nsPoint placeholderOffset(0, 0);
|
|
if ((eStyleUnit_Auto == mStylePosition->mOffset.GetLeftUnit()) ||
|
|
(eStyleUnit_Auto == mStylePosition->mOffset.GetTopUnit()) ||
|
|
(eStyleUnit_Auto == mStylePosition->mOffset.GetRightUnit()) ||
|
|
(eStyleUnit_Auto == mStylePosition->mOffset.GetBottomUnit())) {
|
|
|
|
// Get the placeholder frame
|
|
nsIFrame* placeholderFrame;
|
|
nsCOMPtr<nsIPresShell> presShell;
|
|
aPresContext.GetShell(getter_AddRefs(presShell));
|
|
|
|
presShell->GetPlaceholderFrameFor(frame, &placeholderFrame);
|
|
NS_ASSERTION(nsnull != placeholderFrame, "no placeholder frame");
|
|
if (nsnull != placeholderFrame) {
|
|
placeholderFrame->GetOrigin(placeholderOffset);
|
|
|
|
nsIFrame* parent;
|
|
placeholderFrame->GetParent(&parent);
|
|
while ((nsnull != parent) && (parent != cbrs->frame)) {
|
|
nsPoint origin;
|
|
|
|
parent->GetOrigin(origin);
|
|
placeholderOffset += origin;
|
|
parent->GetParent(&parent);
|
|
}
|
|
|
|
// Offsets are relative to the containing block's padding edge, so translate
|
|
// from the frame's edge to the padding edge
|
|
nsMargin blockBorder;
|
|
const nsStyleSpacing* blockSpacing;
|
|
|
|
cbrs->frame->GetStyleData(eStyleStruct_Spacing, (const nsStyleStruct*&)blockSpacing);
|
|
blockSpacing->GetBorder(blockBorder);
|
|
placeholderOffset.x -= blockBorder.top;
|
|
placeholderOffset.y -= blockBorder.bottom;
|
|
}
|
|
}
|
|
|
|
nsStyleUnit widthUnit = mStylePosition->mWidth.GetUnit();
|
|
nsStyleUnit heightUnit = mStylePosition->mHeight.GetUnit();
|
|
|
|
// Initialize the 'left' and 'right' computed offsets
|
|
PRBool leftIsAuto = PR_FALSE, rightIsAuto = PR_FALSE;
|
|
nsStyleCoord coord;
|
|
if (eStyleUnit_Inherit == mStylePosition->mOffset.GetLeftUnit()) {
|
|
computedOffsets.left = cbrs->computedOffsets.left;
|
|
} else if (eStyleUnit_Auto == mStylePosition->mOffset.GetLeftUnit()) {
|
|
if (NS_STYLE_DIRECTION_LTR == mStyleDisplay->mDirection) {
|
|
computedOffsets.left = placeholderOffset.x;
|
|
} else {
|
|
computedOffsets.left = 0;
|
|
leftIsAuto = PR_TRUE;
|
|
}
|
|
} else {
|
|
ComputeHorizontalValue(containingBlockWidth, mStylePosition->mOffset.GetLeftUnit(),
|
|
mStylePosition->mOffset.GetLeft(coord),
|
|
computedOffsets.left);
|
|
}
|
|
if (eStyleUnit_Inherit == mStylePosition->mOffset.GetRightUnit()) {
|
|
computedOffsets.right = cbrs->computedOffsets.right;
|
|
} else if (eStyleUnit_Auto == mStylePosition->mOffset.GetRightUnit()) {
|
|
if (NS_STYLE_DIRECTION_RTL == mStyleDisplay->mDirection) {
|
|
computedOffsets.right = placeholderOffset.x;
|
|
} else {
|
|
computedOffsets.right = 0;
|
|
rightIsAuto = PR_TRUE;
|
|
}
|
|
} else {
|
|
ComputeHorizontalValue(containingBlockWidth, mStylePosition->mOffset.GetRightUnit(),
|
|
mStylePosition->mOffset.GetRight(coord),
|
|
computedOffsets.right);
|
|
}
|
|
|
|
// Calculate the computed width
|
|
if (eStyleUnit_Auto == widthUnit) {
|
|
// Any remaining 'auto' values for 'left', 'right', 'margin-left', or
|
|
// 'margin-right' are replaced with 0 (their default value)
|
|
computedWidth = containingBlockWidth - computedOffsets.left -
|
|
computedMargin.left - mComputedBorderPadding.left -
|
|
mComputedBorderPadding.right -
|
|
computedMargin.right - computedOffsets.right;
|
|
|
|
if (computedWidth > mComputedMaxWidth) {
|
|
computedWidth = mComputedMaxWidth;
|
|
} else if (computedWidth < mComputedMinWidth) {
|
|
computedWidth = mComputedMinWidth;
|
|
}
|
|
|
|
} else {
|
|
if (eStyleUnit_Inherit == widthUnit) {
|
|
computedWidth = containingBlockWidth;
|
|
} else {
|
|
// Use the specified value for the computed width
|
|
ComputeHorizontalValue(containingBlockWidth, widthUnit,
|
|
mStylePosition->mWidth, computedWidth);
|
|
}
|
|
if (computedWidth > mComputedMaxWidth) {
|
|
computedWidth = mComputedMaxWidth;
|
|
} else if (computedWidth < mComputedMinWidth) {
|
|
computedWidth = mComputedMinWidth;
|
|
}
|
|
|
|
if (leftIsAuto) {
|
|
// Any 'auto' on 'margin-left' or 'margin-right' are replaced with 0
|
|
// (their default value)
|
|
computedOffsets.left = containingBlockWidth - computedMargin.left -
|
|
mComputedBorderPadding.left - computedWidth -
|
|
mComputedBorderPadding.right -
|
|
computedMargin.right - computedOffsets.right;
|
|
|
|
} else if (rightIsAuto) {
|
|
// Any 'auto' on 'margin-left' or 'margin-right' are replaced with 0
|
|
// (their default value)
|
|
computedOffsets.right = containingBlockWidth - computedOffsets.left -
|
|
computedMargin.left - mComputedBorderPadding.left - computedWidth -
|
|
mComputedBorderPadding.right - computedMargin.right;
|
|
|
|
} else {
|
|
// All that's left to solve for are 'auto' values for 'margin-left' and
|
|
// 'margin-right'
|
|
if ((eStyleUnit_Auto == mStyleSpacing->mMargin.GetLeftUnit()) ||
|
|
(eStyleUnit_Auto == mStyleSpacing->mMargin.GetRightUnit())) {
|
|
|
|
nscoord availMarginSpace = containingBlockWidth -
|
|
computedOffsets.left - mComputedBorderPadding.left -
|
|
computedWidth - mComputedBorderPadding.right -
|
|
computedOffsets.right;
|
|
|
|
if (eStyleUnit_Auto == mStyleSpacing->mMargin.GetLeftUnit()) {
|
|
if (eStyleUnit_Auto == mStyleSpacing->mMargin.GetRightUnit()) {
|
|
// Both 'margin-left' and 'margin-right' are 'auto', so they get
|
|
// equal values
|
|
computedMargin.left = availMarginSpace / 2;
|
|
computedMargin.right = availMarginSpace - computedMargin.left;
|
|
} else {
|
|
computedMargin.left = availMarginSpace;
|
|
}
|
|
} else {
|
|
computedMargin.right = availMarginSpace;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Initialize the 'top' and 'bottom' computed offsets
|
|
PRBool bottomIsAuto = PR_FALSE;
|
|
if (eStyleUnit_Inherit == mStylePosition->mOffset.GetTopUnit()) {
|
|
computedOffsets.top = cbrs->computedOffsets.top;
|
|
} else if ((eStyleUnit_Auto == mStylePosition->mOffset.GetTopUnit()) ||
|
|
((NS_AUTOHEIGHT == containingBlockHeight) &&
|
|
(eStyleUnit_Percent == mStylePosition->mOffset.GetTopUnit()))) {
|
|
// Use the placeholder position
|
|
computedOffsets.top = placeholderOffset.y;
|
|
} else {
|
|
nsStyleCoord coord;
|
|
ComputeVerticalValue(containingBlockHeight, mStylePosition->mOffset.GetTopUnit(),
|
|
mStylePosition->mOffset.GetTop(coord), computedOffsets.top);
|
|
}
|
|
if (eStyleUnit_Inherit == mStylePosition->mOffset.GetBottomUnit()) {
|
|
computedOffsets.bottom = cbrs->computedOffsets.bottom;
|
|
} else if ((eStyleUnit_Auto == mStylePosition->mOffset.GetBottomUnit()) ||
|
|
((NS_AUTOHEIGHT == containingBlockHeight) &&
|
|
(eStyleUnit_Percent == mStylePosition->mOffset.GetBottomUnit()))) {
|
|
if (eStyleUnit_Auto == heightUnit) {
|
|
computedOffsets.bottom = 0;
|
|
} else {
|
|
bottomIsAuto = PR_TRUE;
|
|
}
|
|
} else {
|
|
nsStyleCoord coord;
|
|
ComputeVerticalValue(containingBlockHeight, mStylePosition->mOffset.GetBottomUnit(),
|
|
mStylePosition->mOffset.GetBottom(coord), computedOffsets.bottom);
|
|
}
|
|
|
|
// Check for a percentage based height and a containing block height
|
|
// that depends on its content height, i.e., not explicitly specified
|
|
if (eStyleUnit_Percent == heightUnit) {
|
|
if (NS_AUTOHEIGHT == containingBlockHeight) {
|
|
// Interpret the height like 'auto'
|
|
heightUnit = eStyleUnit_Auto;
|
|
}
|
|
}
|
|
|
|
// Calculate the computed height
|
|
if (eStyleUnit_Auto == heightUnit) {
|
|
// Any 'auto' on 'margin-top' or 'margin-bottom' are replaced with 0
|
|
// (their default value)
|
|
if (NS_FRAME_IS_REPLACED(frameType)) {
|
|
computedHeight = NS_INTRINSICSIZE;
|
|
} else {
|
|
// If the containing block's height was not explicitly specified (i.e.,
|
|
// it depends on its content height), then so does our height
|
|
if (NS_AUTOHEIGHT == containingBlockHeight) {
|
|
computedHeight = NS_AUTOHEIGHT;
|
|
|
|
} else {
|
|
computedHeight = containingBlockHeight - computedOffsets.top -
|
|
computedMargin.top - mComputedBorderPadding.top -
|
|
mComputedBorderPadding.bottom -
|
|
computedMargin.bottom - computedOffsets.bottom;
|
|
|
|
if (computedHeight > mComputedMaxHeight) {
|
|
computedHeight = mComputedMaxHeight;
|
|
} else if (computedHeight < mComputedMinHeight) {
|
|
computedHeight = mComputedMinHeight;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
if (eStyleUnit_Inherit == heightUnit) {
|
|
computedHeight = containingBlockHeight;
|
|
} else {
|
|
// Use the specified value for the computed height
|
|
ComputeVerticalValue(containingBlockHeight, heightUnit,
|
|
mStylePosition->mHeight, computedHeight);
|
|
}
|
|
|
|
if (computedHeight > mComputedMaxHeight) {
|
|
computedHeight = mComputedMaxHeight;
|
|
}
|
|
if (computedHeight < mComputedMinHeight) {
|
|
computedHeight = mComputedMinHeight;
|
|
}
|
|
|
|
if (NS_AUTOHEIGHT != containingBlockHeight) {
|
|
if (bottomIsAuto) {
|
|
// Any 'auto' on 'margin-top' or 'margin-bottom' are replaced with 0
|
|
computedOffsets.bottom = containingBlockHeight - computedOffsets.top -
|
|
computedMargin.top - mComputedBorderPadding.top - computedHeight -
|
|
mComputedBorderPadding.bottom - computedMargin.bottom;
|
|
|
|
} else {
|
|
// All that's left to solve for are 'auto' values for 'margin-top' and
|
|
// 'margin-bottom'
|
|
if ((eStyleUnit_Auto == mStyleSpacing->mMargin.GetTopUnit()) ||
|
|
(eStyleUnit_Auto == mStyleSpacing->mMargin.GetBottomUnit())) {
|
|
|
|
nscoord availMarginSpace = containingBlockHeight - computedOffsets.top -
|
|
mComputedBorderPadding.top - computedHeight - mComputedBorderPadding.bottom -
|
|
computedOffsets.bottom;
|
|
|
|
if (eStyleUnit_Auto == mStyleSpacing->mMargin.GetTopUnit()) {
|
|
if (eStyleUnit_Auto == mStyleSpacing->mMargin.GetBottomUnit()) {
|
|
// Both 'margin-top' and 'margin-bottom' are 'auto', so they get
|
|
// equal values
|
|
computedMargin.top = availMarginSpace / 2;
|
|
computedMargin.bottom = availMarginSpace - computedMargin.top;
|
|
} else {
|
|
computedMargin.top = availMarginSpace;
|
|
}
|
|
} else {
|
|
computedMargin.bottom = availMarginSpace;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// XXX refactor this code to have methods for each set of properties
|
|
// we are computing: width,height,line-height; margin; offsets
|
|
|
|
void
|
|
nsHTMLReflowState::InitConstraints(nsIPresContext& aPresContext)
|
|
{
|
|
// If this is the root frame then set the computed width and
|
|
// height equal to the available space
|
|
if (nsnull == parentReflowState) {
|
|
computedWidth = availableWidth;
|
|
computedHeight = availableHeight;
|
|
computedMargin.SizeTo(0, 0, 0, 0);
|
|
mComputedPadding.SizeTo(0, 0, 0, 0);
|
|
mComputedBorderPadding.SizeTo(0, 0, 0, 0);
|
|
computedOffsets.SizeTo(0, 0, 0, 0);
|
|
mComputedMinWidth = mComputedMinHeight = 0;
|
|
mComputedMaxWidth = mComputedMaxHeight = NS_UNCONSTRAINEDSIZE;
|
|
} else {
|
|
// Get the containing block reflow state
|
|
const nsHTMLReflowState* cbrs =
|
|
GetContainingBlockReflowState(parentReflowState);
|
|
NS_ASSERTION(nsnull != cbrs, "no containing block");
|
|
|
|
// See if the element is relatively positioned
|
|
if (NS_STYLE_POSITION_RELATIVE == mStylePosition->mPosition) {
|
|
ComputeRelativeOffsets(cbrs);
|
|
} else {
|
|
// Initialize offsets to 0
|
|
computedOffsets.SizeTo(0, 0, 0, 0);
|
|
}
|
|
|
|
// Get the containing block width and height. We'll need them when
|
|
// calculating the computed width and height. For all elements other
|
|
// than absolutely positioned elements, the containing block is formed
|
|
// by the content edge
|
|
nscoord containingBlockWidth = cbrs->computedWidth;
|
|
nscoord containingBlockHeight = cbrs->computedHeight;
|
|
if (NS_FRAME_GET_TYPE(frameType) == NS_CSS_FRAME_TYPE_ABSOLUTE) {
|
|
// Containing block is formed by the padding edge and not the padding edge
|
|
containingBlockWidth += cbrs->mComputedPadding.left +
|
|
cbrs->mComputedPadding.right;
|
|
containingBlockHeight += cbrs->mComputedPadding.top +
|
|
cbrs->mComputedPadding.bottom;
|
|
}
|
|
#if 0
|
|
nsFrame::ListTag(stdout, frame); printf(": cb=");
|
|
nsFrame::ListTag(stdout, cbrs->frame); printf(" size=%d,%d\n", containingBlockWidth, containingBlockHeight);
|
|
#endif
|
|
|
|
// See if the containing block height is based on the size of the
|
|
// content
|
|
if (NS_AUTOHEIGHT == containingBlockHeight) {
|
|
// See if the containing block is a scrolled frame, i.e. its
|
|
// parent is a scroll frame. The prescence of the interveening
|
|
// frame (that the scroll frame scrolls) needs to be hidden from
|
|
// the containingBlockHeight calcuation.
|
|
if (cbrs->parentReflowState) {
|
|
nsIFrame* f = cbrs->parentReflowState->frame;
|
|
nsIAtom* frameType;
|
|
|
|
f->GetFrameType(&frameType);
|
|
if (nsLayoutAtoms::scrollFrame == frameType) {
|
|
// Use the scroll frame's computed height instead
|
|
containingBlockHeight =
|
|
((nsHTMLReflowState*)cbrs->parentReflowState)->computedHeight;
|
|
}
|
|
NS_IF_RELEASE(frameType);
|
|
}
|
|
}
|
|
|
|
// Compute margins from the specified margin style information. These
|
|
// become the default computed values, and may be adjusted below
|
|
// XXX fix to provide 0,0 for the top&bottom margins for
|
|
// inline-non-replaced elements
|
|
ComputeMargin(containingBlockWidth, cbrs);
|
|
ComputePadding(containingBlockWidth, cbrs);
|
|
if (!mStyleSpacing->GetBorder(mComputedBorderPadding)) {
|
|
// CSS2 has no percentage borders
|
|
mComputedBorderPadding.SizeTo(0, 0, 0, 0);
|
|
}
|
|
mComputedBorderPadding += mComputedPadding;
|
|
|
|
nsStyleUnit widthUnit = mStylePosition->mWidth.GetUnit();
|
|
nsStyleUnit heightUnit = mStylePosition->mHeight.GetUnit();
|
|
|
|
// Check for a percentage based width and an unconstrained containing
|
|
// block width
|
|
if (eStyleUnit_Percent == widthUnit) {
|
|
if (NS_UNCONSTRAINEDSIZE == containingBlockWidth) {
|
|
// Interpret the width like 'auto'
|
|
widthUnit = eStyleUnit_Auto;
|
|
}
|
|
}
|
|
// Check for a percentage based height and a containing block height
|
|
// that depends on the content height
|
|
if (eStyleUnit_Percent == heightUnit) {
|
|
if (NS_AUTOHEIGHT == containingBlockHeight) {
|
|
// Interpret the height like 'auto'
|
|
heightUnit = eStyleUnit_Auto;
|
|
}
|
|
}
|
|
|
|
// Calculate the computed values for min and max properties
|
|
ComputeMinMaxValues(containingBlockWidth, containingBlockHeight, cbrs);
|
|
|
|
// Calculate the computed width and height. This varies by frame type
|
|
if ((NS_FRAME_REPLACED(NS_CSS_FRAME_TYPE_INLINE) == frameType) ||
|
|
(NS_FRAME_REPLACED(NS_CSS_FRAME_TYPE_FLOATING) == frameType)) {
|
|
// Inline replaced element and floating replaced element are basically
|
|
// treated the same. First calculate the computed width
|
|
if (eStyleUnit_Inherit == widthUnit) {
|
|
computedWidth = containingBlockWidth;
|
|
} else if (eStyleUnit_Auto == widthUnit) {
|
|
// A specified value of 'auto' uses the element's intrinsic width
|
|
computedWidth = NS_INTRINSICSIZE;
|
|
} else {
|
|
ComputeHorizontalValue(containingBlockWidth, widthUnit,
|
|
mStylePosition->mWidth,
|
|
computedWidth);
|
|
}
|
|
if (computedWidth > mComputedMaxWidth) {
|
|
computedWidth = mComputedMaxWidth;
|
|
} else if (computedWidth < mComputedMinWidth) {
|
|
computedWidth = mComputedMinWidth;
|
|
}
|
|
|
|
// Now calculate the computed height
|
|
if (eStyleUnit_Inherit == heightUnit) {
|
|
computedHeight = containingBlockHeight;
|
|
} else if (eStyleUnit_Auto == heightUnit) {
|
|
// A specified value of 'auto' uses the element's intrinsic height
|
|
computedHeight = NS_INTRINSICSIZE;
|
|
} else {
|
|
ComputeVerticalValue(containingBlockHeight, heightUnit,
|
|
mStylePosition->mHeight,
|
|
computedHeight);
|
|
}
|
|
if (computedHeight > mComputedMaxHeight) {
|
|
computedHeight = mComputedMaxHeight;
|
|
} else if (computedHeight < mComputedMinHeight) {
|
|
computedHeight = mComputedMinHeight;
|
|
}
|
|
|
|
} else if (NS_CSS_FRAME_TYPE_FLOATING == frameType) {
|
|
// Floating non-replaced element. First calculate the computed width
|
|
if (eStyleUnit_Inherit == widthUnit) {
|
|
computedWidth = containingBlockWidth;
|
|
} else if (eStyleUnit_Auto == widthUnit) {
|
|
// A specified value of 'auto' becomes a computed width of 0
|
|
computedWidth = 0;
|
|
} else {
|
|
ComputeHorizontalValue(containingBlockWidth, widthUnit,
|
|
mStylePosition->mWidth,
|
|
computedWidth);
|
|
}
|
|
if (computedWidth > mComputedMaxWidth) {
|
|
computedWidth = mComputedMaxWidth;
|
|
} else if (computedWidth < mComputedMinWidth) {
|
|
computedWidth = mComputedMinWidth;
|
|
}
|
|
|
|
// Now calculate the computed height
|
|
if (eStyleUnit_Inherit == heightUnit) {
|
|
computedHeight = containingBlockHeight;
|
|
} else if (eStyleUnit_Auto == heightUnit) {
|
|
computedHeight = NS_AUTOHEIGHT; // let it choose its height
|
|
} else {
|
|
ComputeVerticalValue(containingBlockHeight, heightUnit,
|
|
mStylePosition->mHeight,
|
|
computedHeight);
|
|
}
|
|
if (computedHeight > mComputedMaxHeight) {
|
|
computedHeight = mComputedMaxHeight;
|
|
} else if (computedHeight < mComputedMinHeight) {
|
|
computedHeight = mComputedMinHeight;
|
|
}
|
|
|
|
} else if (NS_CSS_FRAME_TYPE_INTERNAL_TABLE == frameType) {
|
|
// Internal table elements. The rules vary depending on the type.
|
|
// Calculate the computed width
|
|
if ((NS_STYLE_DISPLAY_TABLE_ROW == mStyleDisplay->mDisplay) ||
|
|
(NS_STYLE_DISPLAY_TABLE_ROW_GROUP == mStyleDisplay->mDisplay)) {
|
|
// 'width' property doesn't apply to table rows and row groups
|
|
widthUnit = eStyleUnit_Auto;
|
|
}
|
|
|
|
if (eStyleUnit_Inherit == widthUnit) {
|
|
computedWidth = containingBlockWidth;
|
|
} else if (eStyleUnit_Auto == widthUnit) {
|
|
computedWidth = availableWidth;
|
|
|
|
if (computedWidth != NS_UNCONSTRAINEDSIZE) {
|
|
// Internal table elements don't have margins, but they have border
|
|
// and padding
|
|
computedWidth -= mComputedBorderPadding.left +
|
|
mComputedBorderPadding.right;
|
|
}
|
|
|
|
} else {
|
|
ComputeHorizontalValue(containingBlockWidth, widthUnit,
|
|
mStylePosition->mWidth,
|
|
computedWidth);
|
|
}
|
|
|
|
// Calculate the computed height
|
|
if ((NS_STYLE_DISPLAY_TABLE_COLUMN == mStyleDisplay->mDisplay) ||
|
|
(NS_STYLE_DISPLAY_TABLE_COLUMN_GROUP == mStyleDisplay->mDisplay)) {
|
|
// 'height' property doesn't apply to table columns and column groups
|
|
heightUnit = eStyleUnit_Auto;
|
|
}
|
|
if (eStyleUnit_Inherit == heightUnit) {
|
|
computedHeight = containingBlockHeight;
|
|
} else if (eStyleUnit_Auto == heightUnit) {
|
|
computedHeight = NS_AUTOHEIGHT;
|
|
} else {
|
|
ComputeVerticalValue(containingBlockHeight, heightUnit,
|
|
mStylePosition->mHeight,
|
|
computedHeight);
|
|
}
|
|
|
|
// Doesn't apply to table elements
|
|
mComputedMinWidth = mComputedMinHeight = 0;
|
|
mComputedMaxWidth = mComputedMaxHeight = NS_UNCONSTRAINEDSIZE;
|
|
|
|
} else if (NS_FRAME_GET_TYPE(frameType) == NS_CSS_FRAME_TYPE_ABSOLUTE) {
|
|
InitAbsoluteConstraints(aPresContext, cbrs, containingBlockWidth,
|
|
containingBlockHeight);
|
|
} else if (NS_CSS_FRAME_TYPE_INLINE == frameType) {
|
|
// Inline non-replaced elements do not have computed widths or heights
|
|
// XXX add this check to HaveFixedContentHeight/Width too
|
|
computedWidth = NS_UNCONSTRAINEDSIZE;
|
|
computedHeight = NS_UNCONSTRAINEDSIZE;
|
|
computedMargin.top = 0;
|
|
computedMargin.bottom = 0;
|
|
mComputedMinWidth = mComputedMinHeight = 0;
|
|
mComputedMaxWidth = mComputedMaxHeight = NS_UNCONSTRAINEDSIZE;
|
|
} else {
|
|
ComputeBlockBoxData(aPresContext, cbrs, widthUnit, heightUnit,
|
|
containingBlockWidth,
|
|
containingBlockHeight);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Compute the box data for block and block-replaced elements in the
|
|
// normal flow.
|
|
void
|
|
nsHTMLReflowState::ComputeBlockBoxData(nsIPresContext& aPresContext,
|
|
const nsHTMLReflowState* cbrs,
|
|
nsStyleUnit aWidthUnit,
|
|
nsStyleUnit aHeightUnit,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight)
|
|
{
|
|
// Compute the content width
|
|
if (eStyleUnit_Auto == aWidthUnit) {
|
|
if (NS_FRAME_IS_REPLACED(frameType)) {
|
|
// Block-level replaced element in the flow. A specified value of
|
|
// 'auto' uses the element's intrinsic width
|
|
computedWidth = NS_INTRINSICSIZE;
|
|
} else {
|
|
// Block-level non-replaced element in the flow
|
|
if (NS_UNCONSTRAINEDSIZE == availableWidth) {
|
|
computedWidth = NS_UNCONSTRAINEDSIZE;
|
|
} else {
|
|
// Block-level non-replaced element in the flow. 'auto'
|
|
// values for margin-left and margin-right become 0 and the
|
|
// sum of the areas must equal the width of the content-area
|
|
// of the parent element.
|
|
computedWidth = availableWidth - computedMargin.left -
|
|
computedMargin.right - mComputedBorderPadding.left -
|
|
mComputedBorderPadding.right;
|
|
|
|
// Take into account any min and max values
|
|
if (computedWidth > mComputedMaxWidth) {
|
|
// Apply the rules again, but this time using 'max-width' as
|
|
// the value for 'width'
|
|
computedWidth = mComputedMaxWidth;
|
|
} else if (computedWidth < mComputedMinWidth) {
|
|
// Apply the rules again, but this time using 'min-width' as
|
|
// the value for 'width'
|
|
computedWidth = mComputedMinWidth;
|
|
}
|
|
CalculateLeftRightMargin(cbrs, computedWidth);
|
|
}
|
|
}
|
|
} else {
|
|
if (eStyleUnit_Inherit == aWidthUnit) {
|
|
// Use parent elements width. Note that if its width was
|
|
// 'inherit', then it already did this so we don't need to
|
|
// recurse upwards.
|
|
//
|
|
// We use the containing blocks width here for the "parent"
|
|
// elements width, because we want to skip over any intervening
|
|
// inline elements (since width doesn't apply to them).
|
|
if (NS_UNCONSTRAINEDSIZE != aContainingBlockWidth) {
|
|
computedWidth = aContainingBlockWidth;
|
|
}
|
|
else {
|
|
computedWidth = NS_UNCONSTRAINEDSIZE;
|
|
}
|
|
}
|
|
else {
|
|
ComputeHorizontalValue(aContainingBlockWidth, aWidthUnit,
|
|
mStylePosition->mWidth, computedWidth);
|
|
}
|
|
|
|
// Take into account any min and max values
|
|
if (computedWidth > mComputedMaxWidth) {
|
|
computedWidth = mComputedMaxWidth;
|
|
} else if (computedWidth < mComputedMinWidth) {
|
|
computedWidth = mComputedMinWidth;
|
|
}
|
|
|
|
// Calculate the computed left and right margin again taking into
|
|
// account the computed width, border/padding, and width of the
|
|
// containing block
|
|
CalculateLeftRightMargin(cbrs, computedWidth);
|
|
}
|
|
|
|
// Compute the content height
|
|
if (eStyleUnit_Inherit == aHeightUnit) {
|
|
// Use parent elements height (note that if its height was inherit
|
|
// then it already did this so we don't need to recurse upwards).
|
|
//
|
|
// We use the containing blocks height here for the "parent"
|
|
// elements height because we want to skip over any interveening
|
|
// inline elements (since height doesn't apply to them).
|
|
if (NS_UNCONSTRAINEDSIZE != aContainingBlockHeight) {
|
|
computedHeight = aContainingBlockHeight;
|
|
}
|
|
else {
|
|
computedHeight = NS_UNCONSTRAINEDSIZE;
|
|
}
|
|
} else if (eStyleUnit_Auto == aHeightUnit) {
|
|
if (NS_FRAME_IS_REPLACED(frameType)) {
|
|
// For replaced elements use the intrinsic size for "auto"
|
|
computedHeight = NS_INTRINSICSIZE;
|
|
} else {
|
|
// For non-replaced elements auto means unconstrained
|
|
computedHeight = NS_UNCONSTRAINEDSIZE;
|
|
}
|
|
} else {
|
|
ComputeVerticalValue(aContainingBlockHeight, aHeightUnit,
|
|
mStylePosition->mHeight, computedHeight);
|
|
}
|
|
if (computedHeight > mComputedMaxHeight) {
|
|
computedHeight = mComputedMaxHeight;
|
|
} else if (computedHeight < mComputedMinHeight) {
|
|
computedHeight = mComputedMinHeight;
|
|
}
|
|
}
|
|
|
|
// Helper function that re-calculates the left and right margin based on
|
|
// the width of the containing block, the border/padding, and the computed
|
|
// width.
|
|
//
|
|
// This function is called by InitConstraints() when the 'width' property
|
|
// has a value other than 'auto'
|
|
void
|
|
nsHTMLReflowState::CalculateLeftRightMargin(const nsHTMLReflowState* cbrs,
|
|
nscoord aComputedWidth)
|
|
{
|
|
// We can only provide values for auto side margins in a constrained
|
|
// reflow. For unconstrained reflow there is no effective width to
|
|
// compute against...
|
|
if ((NS_UNCONSTRAINEDSIZE != aComputedWidth) &&
|
|
(NS_UNCONSTRAINEDSIZE != cbrs->computedWidth)) {
|
|
|
|
PRBool isAutoLeftMargin = eStyleUnit_Auto == mStyleSpacing->mMargin.GetLeftUnit();
|
|
PRBool isAutoRightMargin = eStyleUnit_Auto == mStyleSpacing->mMargin.GetRightUnit();
|
|
|
|
// Calculate how much space is available for margins
|
|
nscoord availMarginSpace = cbrs->computedWidth - aComputedWidth -
|
|
mComputedBorderPadding.left - mComputedBorderPadding.right;
|
|
|
|
if (availMarginSpace > 0) {
|
|
|
|
// See whether we're over constrained
|
|
if (!isAutoLeftMargin && !isAutoRightMargin) {
|
|
// Neither margin is 'auto' so we're over constrained. Use the
|
|
// 'direction' property to tell which margin to ignore
|
|
/*XXX*/ if (NS_STYLE_DISPLAY_TABLE != mStyleDisplay->mDisplay) {
|
|
if (NS_STYLE_DIRECTION_LTR == mStyleDisplay->mDirection) {
|
|
isAutoRightMargin = PR_TRUE;
|
|
} else {
|
|
isAutoLeftMargin = PR_TRUE;
|
|
}
|
|
/*XXX*/ }
|
|
}
|
|
|
|
if (isAutoLeftMargin) {
|
|
if (isAutoRightMargin) {
|
|
// Both margins are 'auto' so their computed values are equal
|
|
computedMargin.left = availMarginSpace / 2;
|
|
computedMargin.right = availMarginSpace - computedMargin.left;
|
|
} else {
|
|
computedMargin.left = availMarginSpace - computedMargin.right;
|
|
}
|
|
|
|
} else if (isAutoRightMargin) {
|
|
computedMargin.right = availMarginSpace - computedMargin.left;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
nscoord
|
|
nsHTMLReflowState::CalcLineHeight(nsIPresContext& aPresContext,
|
|
nsIFrame* aFrame)
|
|
{
|
|
nscoord lineHeight = -1;
|
|
nsIStyleContext* sc;
|
|
aFrame->GetStyleContext(&sc);
|
|
const nsStyleFont* elementFont = nsnull;
|
|
if (nsnull != sc) {
|
|
elementFont = (const nsStyleFont*)sc->GetStyleData(eStyleStruct_Font);
|
|
for (;;) {
|
|
const nsStyleText* text = (const nsStyleText*)
|
|
sc->GetStyleData(eStyleStruct_Text);
|
|
if (nsnull != text) {
|
|
nsStyleUnit unit = text->mLineHeight.GetUnit();
|
|
if (eStyleUnit_Normal == unit) {
|
|
// Normal value; we use a factor of 1.0 for normal
|
|
lineHeight = elementFont->mFont.size;
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" line-height: normal result=%d\n", lineHeight);
|
|
#endif
|
|
break;
|
|
} else if (eStyleUnit_Factor == unit) {
|
|
// CSS2 spec says that the number is inherited, not the
|
|
// computed value. Therefore use the font size of the
|
|
// element times the inherited number.
|
|
nscoord size = elementFont->mFont.size;
|
|
lineHeight = nscoord(size * text->mLineHeight.GetFactorValue());
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" line-height: factor=%g result=%d\n",
|
|
text->mLineHeight.GetFactorValue(), lineHeight);
|
|
#endif
|
|
break;
|
|
}
|
|
else if (eStyleUnit_Coord == unit) {
|
|
lineHeight = text->mLineHeight.GetCoordValue();
|
|
break;
|
|
}
|
|
else if (eStyleUnit_Percent == unit) {
|
|
// XXX This could arguably be the font-metrics actual height
|
|
// instead since the spec says use the computed height.
|
|
const nsStyleFont* font = (const nsStyleFont*)
|
|
sc->GetStyleData(eStyleStruct_Font);
|
|
nscoord size = font->mFont.size;
|
|
lineHeight = nscoord(size * text->mLineHeight.GetPercentValue());
|
|
break;
|
|
}
|
|
else if (eStyleUnit_Inherit == unit) {
|
|
nsIStyleContext* parentSC;
|
|
parentSC = sc->GetParent();
|
|
if (nsnull == parentSC) {
|
|
// Note: Break before releasing to avoid double-releasing sc
|
|
break;
|
|
}
|
|
NS_RELEASE(sc);
|
|
sc = parentSC;
|
|
}
|
|
else {
|
|
// other units are not part of the spec so don't bother
|
|
// looping
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
NS_RELEASE(sc);
|
|
}
|
|
|
|
return lineHeight;
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputeHorizontalValue(nscoord aContainingBlockWidth,
|
|
nsStyleUnit aUnit,
|
|
const nsStyleCoord& aCoord,
|
|
nscoord& aResult)
|
|
{
|
|
NS_PRECONDITION(eStyleUnit_Inherit != aUnit, "unexpected unit");
|
|
aResult = 0;
|
|
if (eStyleUnit_Percent == aUnit) {
|
|
if (NS_UNCONSTRAINEDSIZE == aContainingBlockWidth) {
|
|
aResult = 0;
|
|
} else {
|
|
float pct = aCoord.GetPercentValue();
|
|
aResult = NSToCoordFloor(aContainingBlockWidth * pct);
|
|
}
|
|
|
|
} else if (eStyleUnit_Coord == aUnit) {
|
|
aResult = aCoord.GetCoordValue();
|
|
}
|
|
else if (eStyleUnit_Chars == aUnit) {
|
|
if ((nsnull == rendContext) || (nsnull == frame)) {
|
|
// We can't compute it without a rendering context or frame, so
|
|
// pretend its zero...
|
|
}
|
|
else {
|
|
const nsStyleFont* font;
|
|
frame->GetStyleData(eStyleStruct_Font, (const nsStyleStruct*&) font);
|
|
rendContext->SetFont(font->mFont);
|
|
nscoord fontWidth;
|
|
rendContext->GetWidth('M', fontWidth);
|
|
aResult = aCoord.GetIntValue() * fontWidth;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputeVerticalValue(nscoord aContainingBlockHeight,
|
|
nsStyleUnit aUnit,
|
|
const nsStyleCoord& aCoord,
|
|
nscoord& aResult)
|
|
{
|
|
NS_PRECONDITION(eStyleUnit_Inherit != aUnit, "unexpected unit");
|
|
aResult = 0;
|
|
if (eStyleUnit_Percent == aUnit) {
|
|
// Verify no one is trying to calculate a percentage based height against
|
|
// a height that's shrink wrapping to its content. In that case they should
|
|
// treat the specified value like 'auto'
|
|
NS_ASSERTION(NS_AUTOHEIGHT != aContainingBlockHeight, "unexpected containing block height");
|
|
float pct = aCoord.GetPercentValue();
|
|
aResult = NSToCoordFloor(aContainingBlockHeight * pct);
|
|
|
|
} else if (eStyleUnit_Coord == aUnit) {
|
|
aResult = aCoord.GetCoordValue();
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputeMargin(nscoord aContainingBlockWidth,
|
|
const nsHTMLReflowState* aContainingBlockRS)
|
|
{
|
|
// If style style can provide us the margin directly, then use it.
|
|
if (!mStyleSpacing->GetMargin(computedMargin)) {
|
|
// We have to compute the value
|
|
if (NS_UNCONSTRAINEDSIZE == aContainingBlockWidth) {
|
|
computedMargin.left = 0;
|
|
computedMargin.right = 0;
|
|
|
|
} else {
|
|
nsStyleCoord left, right;
|
|
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mMargin.GetLeftUnit()) {
|
|
computedMargin.left = aContainingBlockRS->computedMargin.left;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mMargin.GetLeftUnit(),
|
|
mStyleSpacing->mMargin.GetLeft(left),
|
|
computedMargin.left);
|
|
}
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mMargin.GetRightUnit()) {
|
|
computedMargin.right = aContainingBlockRS->computedMargin.right;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mMargin.GetRightUnit(),
|
|
mStyleSpacing->mMargin.GetRight(right),
|
|
computedMargin.right);
|
|
}
|
|
}
|
|
|
|
const nsHTMLReflowState* rs2 = GetPageBoxReflowState(parentReflowState);
|
|
nsStyleCoord top, bottom;
|
|
if (nsnull != rs2) {
|
|
// According to the CSS2 spec, margin percentages are
|
|
// calculated with respect to the *height* of the containing
|
|
// block when in a paginated context.
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mMargin.GetTopUnit()) {
|
|
computedMargin.top = aContainingBlockRS->computedMargin.top;
|
|
} else {
|
|
ComputeVerticalValue(rs2->computedHeight,
|
|
mStyleSpacing->mMargin.GetTopUnit(),
|
|
mStyleSpacing->mMargin.GetTop(top),
|
|
computedMargin.top);
|
|
}
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mMargin.GetBottomUnit()) {
|
|
computedMargin.bottom = aContainingBlockRS->computedMargin.bottom;
|
|
} else {
|
|
ComputeVerticalValue(rs2->computedHeight,
|
|
mStyleSpacing->mMargin.GetBottomUnit(),
|
|
mStyleSpacing->mMargin.GetBottom(bottom),
|
|
computedMargin.bottom);
|
|
}
|
|
}
|
|
else {
|
|
// According to the CSS2 spec, margin percentages are
|
|
// calculated with respect to the *width* of the containing
|
|
// block, even for margin-top and margin-bottom.
|
|
if (NS_UNCONSTRAINEDSIZE == aContainingBlockWidth) {
|
|
computedMargin.top = 0;
|
|
computedMargin.bottom = 0;
|
|
|
|
} else {
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mMargin.GetTopUnit()) {
|
|
computedMargin.top = aContainingBlockRS->computedMargin.top;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mMargin.GetTopUnit(),
|
|
mStyleSpacing->mMargin.GetTop(top),
|
|
computedMargin.top);
|
|
}
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mMargin.GetBottomUnit()) {
|
|
computedMargin.bottom = aContainingBlockRS->computedMargin.bottom;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mMargin.GetBottomUnit(),
|
|
mStyleSpacing->mMargin.GetBottom(bottom),
|
|
computedMargin.bottom);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputePadding(nscoord aContainingBlockWidth,
|
|
const nsHTMLReflowState* aContainingBlockRS)
|
|
|
|
{
|
|
// If style can provide us the padding directly, then use it.
|
|
if (!mStyleSpacing->GetPadding(mComputedPadding)) {
|
|
// We have to compute the value
|
|
nsStyleCoord left, right, top, bottom;
|
|
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mPadding.GetLeftUnit()) {
|
|
mComputedPadding.left = aContainingBlockRS->mComputedPadding.left;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mPadding.GetLeftUnit(),
|
|
mStyleSpacing->mPadding.GetLeft(left),
|
|
mComputedPadding.left);
|
|
}
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mPadding.GetRightUnit()) {
|
|
mComputedPadding.right = aContainingBlockRS->mComputedPadding.right;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mPadding.GetRightUnit(),
|
|
mStyleSpacing->mPadding.GetRight(right),
|
|
mComputedPadding.right);
|
|
}
|
|
|
|
// According to the CSS2 spec, percentages are calculated with respect to
|
|
// containing block width for padding-top and padding-bottom
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mPadding.GetTopUnit()) {
|
|
mComputedPadding.top = aContainingBlockRS->mComputedPadding.top;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mPadding.GetTopUnit(),
|
|
mStyleSpacing->mPadding.GetTop(top),
|
|
mComputedPadding.top);
|
|
}
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mPadding.GetBottomUnit()) {
|
|
mComputedPadding.bottom = aContainingBlockRS->mComputedPadding.bottom;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mPadding.GetBottomUnit(),
|
|
mStyleSpacing->mPadding.GetBottom(bottom),
|
|
mComputedPadding.bottom);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputeMinMaxValues(nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
const nsHTMLReflowState* aContainingBlockRS)
|
|
{
|
|
nsStyleUnit minWidthUnit = mStylePosition->mMinWidth.GetUnit();
|
|
if (eStyleUnit_Inherit == minWidthUnit) {
|
|
mComputedMinWidth = aContainingBlockRS->mComputedMinWidth;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth, minWidthUnit,
|
|
mStylePosition->mMinWidth, mComputedMinWidth);
|
|
}
|
|
nsStyleUnit maxWidthUnit = mStylePosition->mMaxWidth.GetUnit();
|
|
if (eStyleUnit_Inherit == maxWidthUnit) {
|
|
mComputedMaxWidth = aContainingBlockRS->mComputedMaxWidth;
|
|
} else if (eStyleUnit_Null == maxWidthUnit) {
|
|
// Specified value of 'none'
|
|
mComputedMaxWidth = NS_UNCONSTRAINEDSIZE; // no limit
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth, maxWidthUnit,
|
|
mStylePosition->mMaxWidth, mComputedMaxWidth);
|
|
}
|
|
|
|
// If the computed value of 'min-width' is greater than the value of
|
|
// 'max-width', 'max-width' is set to the value of 'min-width'
|
|
if (mComputedMinWidth > mComputedMaxWidth) {
|
|
mComputedMaxWidth = mComputedMinWidth;
|
|
}
|
|
|
|
nsStyleUnit minHeightUnit = mStylePosition->mMinHeight.GetUnit();
|
|
if (eStyleUnit_Inherit == minHeightUnit) {
|
|
mComputedMinHeight = aContainingBlockRS->mComputedMinHeight;
|
|
} else {
|
|
// Check for percentage based values and a containing block height that
|
|
// depends on the content height. Treat them like 'auto'
|
|
if ((NS_AUTOHEIGHT == aContainingBlockHeight) &&
|
|
(eStyleUnit_Percent == minHeightUnit)) {
|
|
mComputedMinHeight = 0;
|
|
} else {
|
|
ComputeVerticalValue(aContainingBlockHeight, minHeightUnit,
|
|
mStylePosition->mMinHeight, mComputedMinHeight);
|
|
}
|
|
}
|
|
nsStyleUnit maxHeightUnit = mStylePosition->mMaxHeight.GetUnit();
|
|
if (eStyleUnit_Inherit == maxHeightUnit) {
|
|
mComputedMaxHeight = aContainingBlockRS->mComputedMaxHeight;
|
|
} else if (eStyleUnit_Null == maxHeightUnit) {
|
|
// Specified value of 'none'
|
|
mComputedMaxHeight = NS_UNCONSTRAINEDSIZE; // no limit
|
|
} else {
|
|
// Check for percentage based values and a containing block height that
|
|
// depends on the content height. Treat them like 'auto'
|
|
if ((NS_AUTOHEIGHT == aContainingBlockHeight) &&
|
|
(eStyleUnit_Percent == maxHeightUnit)) {
|
|
mComputedMaxHeight = NS_UNCONSTRAINEDSIZE;
|
|
} else {
|
|
ComputeVerticalValue(aContainingBlockHeight, maxHeightUnit,
|
|
mStylePosition->mMaxHeight, mComputedMaxHeight);
|
|
}
|
|
}
|
|
|
|
// If the computed value of 'min-height' is greater than the value of
|
|
// 'max-height', 'max-height' is set to the value of 'min-height'
|
|
if (mComputedMinHeight > mComputedMaxHeight) {
|
|
mComputedMaxHeight = mComputedMinHeight;
|
|
}
|
|
}
|