pjs/layout/generic/nsAreaFrame.cpp

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C++
Исходник Обычный вид История

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/* -*- 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 "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsAreaFrame.h"
#include "nsIContent.h"
#include "nsIHTMLContent.h"
#include "nsIReflowCommand.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIPresContext.h"
#include "nsIPresShell.h"
#include "nsIViewManager.h"
#include "nsIDeviceContext.h"
#include "nsSpaceManager.h"
#include "nsHTMLAtoms.h"
#include "nsIView.h"
#include "nsViewsCID.h"
#include "nsHTMLIIDs.h"
#include "nsIWebShell.h"
#include "nsHTMLValue.h"
#include "nsHTMLParts.h"
#include "nsLayoutAtoms.h"
static NS_DEFINE_IID(kIWebShellIID, NS_IWEB_SHELL_IID);
static NS_DEFINE_IID(kAreaFrameIID, NS_IAREAFRAME_IID);
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nsresult
NS_NewAreaFrame(nsIFrame*& aResult, PRUint32 aFlags)
{
nsAreaFrame* it = new nsAreaFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
it->SetFlags(aFlags);
aResult = it;
return NS_OK;
}
nsAreaFrame::nsAreaFrame()
{
mState &= ~NS_FRAME_SYNC_FRAME_AND_VIEW; // let us handle it
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}
nsAreaFrame::~nsAreaFrame()
{
NS_IF_RELEASE(mSpaceManager);
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}
/////////////////////////////////////////////////////////////////////////////
// nsISupports
NS_IMETHODIMP
nsAreaFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
if (NULL == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(kAreaFrameIID)) {
nsIAreaFrame* tmp = (nsIAreaFrame*)this;
*aInstancePtr = (void*)tmp;
return NS_OK;
}
return nsBlockFrame::QueryInterface(aIID, aInstancePtr);
}
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/////////////////////////////////////////////////////////////////////////////
// nsIFrame
NS_IMETHODIMP
nsAreaFrame::Init(nsIPresContext& aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext)
{
// Create a space manager if requested
if (0 == (mFlags & NS_AREA_NO_SPACE_MGR)) {
mSpaceManager = new nsSpaceManager(this);
NS_ADDREF(mSpaceManager);
}
return nsBlockFrame::Init(aPresContext, aContent, aParent, aContext);
}
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NS_IMETHODIMP
nsAreaFrame::DeleteFrame(nsIPresContext& aPresContext)
{
mAbsoluteFrames.DeleteFrames(aPresContext);
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return nsBlockFrame::DeleteFrame(aPresContext);
}
NS_IMETHODIMP
nsAreaFrame::SetInitialChildList(nsIPresContext& aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList)
{
nsresult rv;
if (nsLayoutAtoms::absoluteList == aListName) {
mAbsoluteFrames.SetFrames(aChildList);
rv = NS_OK;
} else {
rv = nsBlockFrame::SetInitialChildList(aPresContext, aListName, aChildList);
}
return rv;
}
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NS_IMETHODIMP
nsAreaFrame::GetAdditionalChildListName(PRInt32 aIndex,
nsIAtom*& aListName) const
{
if (aIndex <= NS_BLOCK_FRAME_LAST_LIST_INDEX) {
return nsBlockFrame::GetAdditionalChildListName(aIndex, aListName);
}
nsIAtom* atom = nsnull;
if (NS_AREA_FRAME_ABSOLUTE_LIST_INDEX == aIndex) {
atom = nsLayoutAtoms::absoluteList;
NS_ADDREF(atom);
}
aListName = atom;
return NS_OK;
}
NS_IMETHODIMP
nsAreaFrame::FirstChild(nsIAtom* aListName, nsIFrame*& aFirstChild) const
{
if (aListName == nsLayoutAtoms::absoluteList) {
aFirstChild = mAbsoluteFrames.FirstChild();
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return NS_OK;
}
return nsBlockFrame::FirstChild(aListName, aFirstChild);
}
#ifdef NS_DEBUG
void
nsAreaFrame::BandData::ComputeAvailSpaceRect()
{
nsBandTrapezoid* trapezoid = data;
if (count > 1) {
// If there's more than one trapezoid that means there are floaters
PRInt32 i;
// Stop when we get to space occupied by a right floater, or when we've
// looked at every trapezoid and none are right floaters
for (i = 0; i < count; i++) {
nsBandTrapezoid* trapezoid = &data[i];
if (trapezoid->state != nsBandTrapezoid::Available) {
const nsStyleDisplay* display;
if (nsBandTrapezoid::OccupiedMultiple == trapezoid->state) {
PRInt32 j, numFrames = trapezoid->frames->Count();
NS_ASSERTION(numFrames > 0, "bad trapezoid frame list");
for (j = 0; j < numFrames; j++) {
nsIFrame* f = (nsIFrame*)trapezoid->frames->ElementAt(j);
f->GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&)display);
if (NS_STYLE_FLOAT_RIGHT == display->mFloats) {
goto foundRightFloater;
}
}
} else {
trapezoid->frame->GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&)display);
if (NS_STYLE_FLOAT_RIGHT == display->mFloats) {
break;
}
}
}
}
foundRightFloater:
if (i > 0) {
trapezoid = &data[i - 1];
}
}
if (nsBandTrapezoid::Available == trapezoid->state) {
// The trapezoid is available
trapezoid->GetRect(availSpace);
} else {
const nsStyleDisplay* display;
// The trapezoid is occupied. That means there's no available space
trapezoid->GetRect(availSpace);
// XXX Better handle the case of multiple frames
if (nsBandTrapezoid::Occupied == trapezoid->state) {
trapezoid->frame->GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&)display);
if (NS_STYLE_FLOAT_LEFT == display->mFloats) {
availSpace.x = availSpace.XMost();
}
}
availSpace.width = 0;
}
}
NS_IMETHODIMP
nsAreaFrame::Paint(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer)
{
// Note: all absolutely positioned elements have views so we don't
// need to worry about painting them
nsresult rv = nsBlockFrame::Paint(aPresContext, aRenderingContext,
aDirtyRect, aWhichLayer);
if ((eFramePaintLayer_Overlay == aWhichLayer) && nsIFrame::GetShowFrameBorders()) {
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// Render the bands in the spacemanager
nsISpaceManager* sm = mSpaceManager;
if (nsnull != sm) {
BandData band;
nscoord y = 0;
while (y < mRect.height) {
sm->GetBandData(y, nsSize(mRect.width, mRect.height - y), band);
band.ComputeAvailSpaceRect();
// Render a box and a diagonal line through the band
aRenderingContext.SetColor(NS_RGB(0,255,0));
aRenderingContext.DrawRect(0, band.availSpace.y,
mRect.width, band.availSpace.height);
aRenderingContext.DrawLine(0, band.availSpace.y,
mRect.width, band.availSpace.YMost());
// Render boxes and opposite diagonal lines around the
// unavailable parts of the band.
PRInt32 i;
for (i = 0; i < band.count; i++) {
nsBandTrapezoid* trapezoid = &band.data[i];
if (nsBandTrapezoid::Available != trapezoid->state) {
nsRect r;
trapezoid->GetRect(r);
if (nsBandTrapezoid::OccupiedMultiple == trapezoid->state) {
aRenderingContext.SetColor(NS_RGB(0,255,128));
}
else {
aRenderingContext.SetColor(NS_RGB(128,255,0));
}
aRenderingContext.DrawRect(r);
aRenderingContext.DrawLine(r.x, r.YMost(), r.XMost(), r.y);
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}
}
y = band.availSpace.YMost();
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}
}
}
return rv;
}
#endif
// Return the x-most and y-most for the child absolutely positioned
// elements
NS_IMETHODIMP
nsAreaFrame::GetPositionedInfo(nscoord& aXMost, nscoord& aYMost) const
{
aXMost = aYMost = 0;
for (nsIFrame* f = mAbsoluteFrames.FirstChild(); nsnull != f; f->GetNextSibling(f)) {
// Get the frame's x-most and y-most. This is for its flowed content only
nsRect rect;
f->GetRect(rect);
if (rect.XMost() > aXMost) {
aXMost = rect.XMost();
}
if (rect.YMost() > aYMost) {
aYMost = rect.YMost();
}
// If the child frame is also an area frame, then take into account its child
// absolutely positioned elements
nsIAreaFrame* areaFrame;
if (NS_SUCCEEDED(f->QueryInterface(kAreaFrameIID, (void**)&areaFrame))) {
nscoord xMost, yMost;
areaFrame->GetPositionedInfo(xMost, yMost);
// Convert to our coordinate space
xMost += rect.x;
yMost += rect.y;
if (xMost > aXMost) {
aXMost = xMost;
}
if (yMost > aYMost) {
aYMost = yMost;
}
}
}
return NS_OK;
}
// XXX Temporary until the view code allows positioned child views to extend
// outside their parent without being clipped...
NS_IMETHODIMP
nsAreaFrame::DidReflow(nsIPresContext& aPresContext,
nsDidReflowStatus aStatus)
{
nsresult rv = nsBlockFrame::DidReflow(aPresContext, aStatus);
if (NS_FRAME_REFLOW_FINISHED == aStatus) {
nsIView* view;
GetView(view);
// Size and position the view if requested
if (nsnull != view) {
// Position and size view relative to its parent, not relative to our
// parent frame (our parent frame may not have a view).
nsIView* parentWithView;
nsPoint origin;
GetOffsetFromView(origin, parentWithView);
nsIViewManager *vm;
view->GetViewManager(vm);
// Take into account any absolutely positioned children
nscoord xMost, yMost;
GetPositionedInfo(xMost, yMost);
vm->ResizeView(view, PR_MAX(mRect.width, xMost), PR_MAX(mRect.height, yMost));
vm->MoveViewTo(view, origin.x, origin.y);
NS_RELEASE(vm);
}
}
return rv;
}
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NS_IMETHODIMP
nsAreaFrame::Reflow(nsIPresContext& aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("enter nsAreaFrame::Reflow: maxSize=%d,%d reason=%d",
aReflowState.availableWidth,
aReflowState.availableHeight,
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aReflowState.reason));
nsresult rv = NS_OK;
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// Make a copy of the reflow state so we can set the space manager
nsHTMLReflowState reflowState(aReflowState);
if (nsnull != mSpaceManager) {
reflowState.spaceManager = mSpaceManager;
// Clear the spacemanager's regions.
mSpaceManager->ClearRegions();
}
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// See if the reflow command is for an absolutely positioned frame
PRBool wasHandled = PR_FALSE;
if (eReflowReason_Incremental == aReflowState.reason) {
nsIFrame* targetFrame;
aReflowState.reflowCommand->GetTarget(targetFrame);
if (this == targetFrame) {
nsIAtom* listName;
PRBool isAbsoluteChild;
// See if it's for an absolutely positioned child frame
aReflowState.reflowCommand->GetChildListName(listName);
isAbsoluteChild = nsLayoutAtoms::absoluteList == listName;
NS_IF_RELEASE(listName);
if (isAbsoluteChild) {
nsIReflowCommand::ReflowType type;
aReflowState.reflowCommand->GetType(type);
// Handle each specific type
if (nsIReflowCommand::FrameAppended == type) {
// Add the frames to our list of absolutely position frames
nsIFrame* childFrames;
aReflowState.reflowCommand->GetChildFrame(childFrames);
NS_ASSERTION(nsnull != childFrames, "null child list");
mAbsoluteFrames.AppendFrames(nsnull, childFrames);
// Indicate we handled the reflow command
wasHandled = PR_TRUE;
} else if (nsIReflowCommand::FrameRemoved == type) {
// Get the new frame
nsIFrame* childFrame;
aReflowState.reflowCommand->GetChildFrame(childFrame);
PRBool zap = mAbsoluteFrames.DeleteFrame(aPresContext, childFrame);
NS_ASSERTION(zap, "didn't find frame");
// XXX We don't need to reflow all the absolutely positioned
// frames. Compute the desired size and exit...
wasHandled = PR_TRUE;
} else if (nsIReflowCommand::FrameInserted == type) {
// Get the new frame
nsIFrame* childFrame;
aReflowState.reflowCommand->GetChildFrame(childFrame);
// Get the previous sibling
nsIFrame* prevSibling;
aReflowState.reflowCommand->GetPrevSiblingFrame(prevSibling);
// Insert the frame
mAbsoluteFrames.InsertFrame(nsnull, prevSibling, childFrame);
wasHandled = PR_TRUE;
} else {
NS_ASSERTION(PR_FALSE, "unexpected reflow type");
}
}
}
}
if (!wasHandled) {
// XXX We need to peek at incremental reflow commands and see if the next
// frame is one of the absolutely positioned frames...
rv = nsBlockFrame::Reflow(aPresContext, aDesiredSize, reflowState, aStatus);
}
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// Reflow any absolutely positioned frames that need reflowing
// XXX We shouldn't really be doing this for all incremental reflow commands
ReflowAbsoluteItems(aPresContext, reflowState);
// Compute our desired size. Take into account any floaters when computing the
// height
if (nsnull != mSpaceManager) {
nscoord floaterYMost;
mSpaceManager->YMost(floaterYMost);
if (floaterYMost > 0) {
// What we need to check for is if the bottom most floater extends below
// the content area of the desired size
nsMargin borderPadding;
nscoord contentYMost;
nsHTMLReflowState::ComputeBorderPaddingFor(this, aReflowState.parentReflowState,
borderPadding);
contentYMost = aDesiredSize.height - borderPadding.bottom;
if (floaterYMost > contentYMost) {
aDesiredSize.height += floaterYMost - contentYMost;
}
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}
}
// XXX This code is really temporary; the lower level frame
// classes need to contribute to the area that needs damage
// repair. This class should only worry about damage repairing
// it's border+padding area.
nsRect damageArea(0, 0, 0, 0);
// Decide how much to repaint based on the reflow type.
// Note: we don't have to handle the initial reflow case and the
// resize reflow case, because they're handled by the scroll frame
if (eReflowReason_Incremental == aReflowState.reason) {
nsIReflowCommand::ReflowType reflowType;
aReflowState.reflowCommand->GetType(reflowType);
// For append reflow commands that target the flowed frames just
// repaint the newly added part of the frame.
if (nsIReflowCommand::FrameAppended == reflowType) {
//this blows. we're repainting everything, but we have no choice
//since we don't know how we got here. see the XXX above for a
//real fix.
#if 1
damageArea.y = 0;
damageArea.height = aDesiredSize.height;
damageArea.width = aDesiredSize.width;
#else
// It's an append reflow command
damageArea.y = mRect.YMost();
damageArea.width = aDesiredSize.width;
damageArea.height = aDesiredSize.height - mRect.height;
if ((damageArea.height < 0) ||
(aDesiredSize.height == mRect.height)) {
// Since we don't know what changed, assume it all changed.
damageArea.y = 0;
damageArea.height = aDesiredSize.height;
}
#endif
} else {
// Ideally the frame that is the target of the reflow command
// (or its parent frame) would generate a damage rect, but
// since none of the frame classes know how to do this then
// for the time being just repaint the entire frame
damageArea.width = aDesiredSize.width;
// If the new height is smaller than the old height then make
// sure we erase whatever used to be displayed
damageArea.height = PR_MAX(aDesiredSize.height, mRect.height);
}
}
// If this is really the body, force a repaint of the damage area
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if ((NS_BLOCK_DOCUMENT_ROOT & mFlags) && !damageArea.IsEmpty()) {
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Invalidate(damageArea);
}
return rv;
}
NS_METHOD
nsAreaFrame::CreateContinuingFrame(nsIPresContext& aPresContext,
nsIFrame* aParent,
nsIStyleContext* aStyleContext,
nsIFrame*& aContinuingFrame)
{
nsAreaFrame* cf = new nsAreaFrame;
if (nsnull == cf) {
return NS_ERROR_OUT_OF_MEMORY;
}
cf->Init(aPresContext, mContent, aParent, aStyleContext);
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cf->SetFlags(mFlags);
cf->AppendToFlow(this);
aContinuingFrame = cf;
return NS_OK;
}
/////////////////////////////////////////////////////////////////////////////
// Helper functions
// Called at the end of the Reflow() member function so we can process
// any abolutely positioned items that need to be reflowed
void
nsAreaFrame::ReflowAbsoluteItems(nsIPresContext& aPresContext,
const nsHTMLReflowState& aReflowState)
{
nsMargin border;
const nsStyleSpacing* spacing =
(const nsStyleSpacing*)mStyleContext->GetStyleData(eStyleStruct_Spacing);
spacing->GetBorder(border);
for (nsIFrame* absoluteFrame = mAbsoluteFrames.FirstChild();
nsnull != absoluteFrame; absoluteFrame->GetNextSibling(absoluteFrame)) {
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PRBool placeFrame = PR_FALSE;
#if 0
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PRBool reflowFrame = PR_FALSE;
#else
PRBool reflowFrame = PR_TRUE;
#endif
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nsReflowReason reflowReason = eReflowReason_Resize;
// Get its style information
const nsStyleDisplay* display;
const nsStylePosition* position;
absoluteFrame->GetStyleData(eStyleStruct_Display, (const nsStyleStruct*&)display);
absoluteFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)position);
#if 0
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// See whether the frame is a newly added frame
if (!IsAbsoluteFrame(absoluteFrame)) {
// The absolutely position item hasn't yet been added to our child list
absoluteFrame->SetGeometricParent(this);
// Add the absolutely positioned frame to the end of the child list
AddAbsoluteFrame(absoluteFrame);
// See whether this is the frame's initial reflow
nsFrameState frameState;
absoluteFrame->GetFrameState(frameState);
if (frameState & NS_FRAME_FIRST_REFLOW) {
reflowReason = eReflowReason_Initial;
}
// We need to place and reflow the absolutely positioned frame
placeFrame = reflowFrame = PR_TRUE;
} else {
#endif
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// We need to place the frame if the left-offset or the top-offset are
// auto or a percentage
if ((eStyleUnit_Coord != position->mOffset.GetLeftUnit()) ||
(eStyleUnit_Coord != position->mOffset.GetTopUnit())) {
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placeFrame = PR_TRUE;
}
// We need to reflow the frame if its width or its height is auto or
// a percentage
if ((eStyleUnit_Coord != position->mWidth.GetUnit()) ||
(eStyleUnit_Coord != position->mHeight.GetUnit())) {
reflowFrame = PR_TRUE;
}
#if 0
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}
#endif
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if (placeFrame || reflowFrame) {
nsIHTMLReflow* htmlReflow;
if (NS_OK == absoluteFrame->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow)) {
htmlReflow->WillReflow(aPresContext);
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if (reflowFrame) {
nsSize availSize(aReflowState.computedWidth, NS_UNCONSTRAINEDSIZE);
nsHTMLReflowMetrics kidDesiredSize(nsnull);
nsHTMLReflowState kidReflowState(aPresContext, absoluteFrame,
aReflowState, availSize,
reflowReason);
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nsReflowStatus status;
// XXX Temporary hack until the block/inline code starts using 'computedWidth'
kidReflowState.availableWidth = kidReflowState.computedWidth;
htmlReflow->Reflow(aPresContext, kidDesiredSize, kidReflowState, status);
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// Position the child relative to our padding edge
nsRect rect(border.left + kidReflowState.computedOffsets.left + kidReflowState.computedMargin.left,
border.top + kidReflowState.computedOffsets.top + kidReflowState.computedMargin.top,
kidDesiredSize.width, kidDesiredSize.height);
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absoluteFrame->SetRect(rect);
}
}
}
}
}
/////////////////////////////////////////////////////////////////////////////
// Diagnostics
NS_IMETHODIMP
nsAreaFrame::GetFrameName(nsString& aResult) const
{
return MakeFrameName("Area", aResult);
}