зеркало из https://github.com/mozilla/pjs.git
574 строки
19 KiB
C++
574 строки
19 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsAreaFrame.h"
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#include "nsBlockBandData.h"
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#include "nsIReflowCommand.h"
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#include "nsIStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsIPresContext.h"
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#include "nsIViewManager.h"
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#include "nsSpaceManager.h"
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#include "nsHTMLAtoms.h"
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#include "nsIView.h"
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#include "nsHTMLIIDs.h"
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#include "nsHTMLValue.h"
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#include "nsHTMLParts.h"
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#include "nsLayoutAtoms.h"
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static NS_DEFINE_IID(kAreaFrameIID, NS_IAREAFRAME_IID);
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nsresult
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NS_NewAreaFrame(nsIFrame*& aResult, PRUint32 aFlags)
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{
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nsAreaFrame* it = new nsAreaFrame;
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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it->SetFlags(aFlags);
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aResult = it;
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return NS_OK;
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}
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nsAreaFrame::nsAreaFrame()
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{
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}
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nsAreaFrame::~nsAreaFrame()
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{
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NS_IF_RELEASE(mSpaceManager);
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}
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/////////////////////////////////////////////////////////////////////////////
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// nsISupports
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NS_IMETHODIMP
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nsAreaFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
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{
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if (NULL == aInstancePtr) {
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return NS_ERROR_NULL_POINTER;
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}
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if (aIID.Equals(kAreaFrameIID)) {
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nsIAreaFrame* tmp = (nsIAreaFrame*)this;
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*aInstancePtr = (void*)tmp;
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return NS_OK;
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}
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return nsBlockFrame::QueryInterface(aIID, aInstancePtr);
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}
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/////////////////////////////////////////////////////////////////////////////
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// nsIFrame
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NS_IMETHODIMP
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nsAreaFrame::Init(nsIPresContext& aPresContext,
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nsIContent* aContent,
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nsIFrame* aParent,
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nsIStyleContext* aContext,
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nsIFrame* aPrevInFlow)
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{
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nsresult rv;
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// Let the block frame do its initialization
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rv = nsBlockFrame::Init(aPresContext, aContent, aParent, aContext, aPrevInFlow);
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// Create a space manager if requested
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if (0 == (mFlags & NS_AREA_NO_SPACE_MGR)) {
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mSpaceManager = new nsSpaceManager(this);
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NS_ADDREF(mSpaceManager);
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}
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return rv;
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}
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NS_IMETHODIMP
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nsAreaFrame::DeleteFrame(nsIPresContext& aPresContext)
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{
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mAbsoluteFrames.DeleteFrames(aPresContext);
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return nsBlockFrame::DeleteFrame(aPresContext);
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}
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NS_IMETHODIMP
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nsAreaFrame::SetInitialChildList(nsIPresContext& aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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nsresult rv;
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if (nsLayoutAtoms::absoluteList == aListName) {
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mAbsoluteFrames.SetFrames(aChildList);
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rv = NS_OK;
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} else {
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rv = nsBlockFrame::SetInitialChildList(aPresContext, aListName, aChildList);
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}
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return rv;
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}
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NS_IMETHODIMP
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nsAreaFrame::GetAdditionalChildListName(PRInt32 aIndex,
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nsIAtom** aListName) const
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{
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NS_PRECONDITION(nsnull != aListName, "null OUT parameter pointer");
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if (aIndex <= NS_BLOCK_FRAME_LAST_LIST_INDEX) {
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return nsBlockFrame::GetAdditionalChildListName(aIndex, aListName);
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}
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*aListName = nsnull;
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if (NS_AREA_FRAME_ABSOLUTE_LIST_INDEX == aIndex) {
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*aListName = nsLayoutAtoms::absoluteList;
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NS_ADDREF(*aListName);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAreaFrame::FirstChild(nsIAtom* aListName, nsIFrame** aFirstChild) const
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{
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NS_PRECONDITION(nsnull != aFirstChild, "null OUT parameter pointer");
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if (aListName == nsLayoutAtoms::absoluteList) {
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*aFirstChild = mAbsoluteFrames.FirstChild();
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return NS_OK;
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}
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return nsBlockFrame::FirstChild(aListName, aFirstChild);
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}
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#ifdef NS_DEBUG
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NS_IMETHODIMP
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nsAreaFrame::Paint(nsIPresContext& aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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nsFramePaintLayer aWhichLayer)
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{
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// Note: all absolutely positioned elements have views so we don't
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// need to worry about painting them
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nsresult rv = nsBlockFrame::Paint(aPresContext, aRenderingContext,
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aDirtyRect, aWhichLayer);
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if ((NS_FRAME_PAINT_LAYER_DEBUG == aWhichLayer) && GetShowFrameBorders()) {
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// Render the bands in the spacemanager
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nsISpaceManager* sm = mSpaceManager;
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if (nsnull != sm) {
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nsBlockBandData band;
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band.Init(sm, nsSize(mRect.width, mRect.height));
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nscoord y = 0;
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while (y < mRect.height) {
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nsRect availArea;
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band.GetAvailableSpace(y, availArea);
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// Render a box and a diagonal line through the band
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aRenderingContext.SetColor(NS_RGB(0,255,0));
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aRenderingContext.DrawRect(0, availArea.y,
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mRect.width, availArea.height);
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aRenderingContext.DrawLine(0, availArea.y,
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mRect.width, availArea.YMost());
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// Render boxes and opposite diagonal lines around the
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// unavailable parts of the band.
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PRInt32 i;
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for (i = 0; i < band.GetTrapezoidCount(); i++) {
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const nsBandTrapezoid* trapezoid = band.GetTrapezoid(i);
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if (nsBandTrapezoid::Available != trapezoid->state) {
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nsRect r;
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trapezoid->GetRect(r);
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if (nsBandTrapezoid::OccupiedMultiple == trapezoid->state) {
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aRenderingContext.SetColor(NS_RGB(0,255,128));
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}
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else {
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aRenderingContext.SetColor(NS_RGB(128,255,0));
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}
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aRenderingContext.DrawRect(r);
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aRenderingContext.DrawLine(r.x, r.YMost(), r.XMost(), r.y);
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}
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}
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y = availArea.YMost();
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}
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}
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}
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return rv;
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}
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#endif
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// Return the x-most and y-most for the child absolutely positioned
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// elements
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NS_IMETHODIMP
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nsAreaFrame::GetPositionedInfo(nscoord& aXMost, nscoord& aYMost) const
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{
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aXMost = aYMost = 0;
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for (nsIFrame* f = mAbsoluteFrames.FirstChild(); nsnull != f; f->GetNextSibling(&f)) {
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// Get the frame's x-most and y-most. This is for its flowed content only
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nsRect rect;
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f->GetRect(rect);
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if (rect.XMost() > aXMost) {
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aXMost = rect.XMost();
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}
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if (rect.YMost() > aYMost) {
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aYMost = rect.YMost();
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}
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// If the child frame is also an area frame, then take into account its child
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// absolutely positioned elements
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nsIAreaFrame* areaFrame;
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if (NS_SUCCEEDED(f->QueryInterface(kAreaFrameIID, (void**)&areaFrame))) {
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nscoord xMost, yMost;
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areaFrame->GetPositionedInfo(xMost, yMost);
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// Convert to our coordinate space
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xMost += rect.x;
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yMost += rect.y;
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if (xMost > aXMost) {
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aXMost = xMost;
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}
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if (yMost > aYMost) {
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aYMost = yMost;
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}
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}
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}
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return NS_OK;
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}
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/**
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* Called by Reflow() to handle the case where it's an incremental reflow
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* targeted at us of an absolutely positioned child frame
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*/
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nsresult
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nsAreaFrame::IncrementalReflow(nsIPresContext& aPresContext,
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const nsHTMLReflowState& aReflowState)
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{
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nsIReflowCommand::ReflowType type;
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nsIFrame* newFrames;
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PRInt32 numFrames = 0;
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// Get the type of reflow command
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aReflowState.reflowCommand->GetType(type);
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// Handle each specific type
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if (nsIReflowCommand::FrameAppended == type) {
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// Add the frames to our list of absolutely position frames
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aReflowState.reflowCommand->GetChildFrame(newFrames);
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NS_ASSERTION(nsnull != newFrames, "null child list");
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numFrames = LengthOf(newFrames);
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mAbsoluteFrames.AppendFrames(nsnull, newFrames);
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} else if (nsIReflowCommand::FrameRemoved == type) {
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// Get the new frame
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nsIFrame* childFrame;
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aReflowState.reflowCommand->GetChildFrame(childFrame);
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PRBool result = mAbsoluteFrames.DeleteFrame(aPresContext, childFrame);
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NS_ASSERTION(result, "didn't find frame to delete");
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} else if (nsIReflowCommand::FrameInserted == type) {
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// Get the previous sibling
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nsIFrame* prevSibling;
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aReflowState.reflowCommand->GetPrevSiblingFrame(prevSibling);
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// Insert the new frames
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aReflowState.reflowCommand->GetChildFrame(newFrames);
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NS_ASSERTION(nsnull != newFrames, "null child list");
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numFrames = LengthOf(newFrames);
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mAbsoluteFrames.InsertFrames(nsnull, prevSibling, newFrames);
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} else {
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NS_ASSERTION(PR_FALSE, "unexpected reflow type");
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}
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// For inserted and appended reflow commands we need to reflow the
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// newly added frames
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if ((nsIReflowCommand::FrameAppended == type) ||
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(nsIReflowCommand::FrameInserted == type)) {
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while (numFrames-- > 0) {
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nsReflowStatus status;
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ReflowAbsoluteFrame(aPresContext, aReflowState, newFrames, PR_TRUE, status);
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newFrames->GetNextSibling(&newFrames);
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAreaFrame::Reflow(nsIPresContext& 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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NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
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("enter nsAreaFrame::Reflow: maxSize=%d,%d reason=%d",
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aReflowState.availableWidth,
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aReflowState.availableHeight,
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aReflowState.reason));
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nsresult rv = NS_OK;
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// See if it's an incremental reflow command
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if (eReflowReason_Incremental == aReflowState.reason) {
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PRBool handled = PR_FALSE;
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// See if it's targeted at us
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nsIFrame* targetFrame;
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aReflowState.reflowCommand->GetTarget(targetFrame);
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if (this == targetFrame) {
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nsIAtom* listName;
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PRBool isAbsoluteChild;
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// It's targeted at us. See if the child frame is absolutely positioned
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aReflowState.reflowCommand->GetChildListName(listName);
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isAbsoluteChild = nsLayoutAtoms::absoluteList == listName;
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NS_IF_RELEASE(listName);
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if (isAbsoluteChild) {
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rv = IncrementalReflow(aPresContext, aReflowState);
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handled = PR_TRUE;
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}
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} else {
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// Peek at the next frame in the reflow path
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nsIFrame* nextFrame;
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aReflowState.reflowCommand->GetNext(nextFrame, PR_FALSE);
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// See if it's one of our absolutely positioned child frames
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NS_ASSERTION(nsnull != nextFrame, "next frame in reflow command is null.");
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if (mAbsoluteFrames.ContainsFrame(nextFrame)) {
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// Remove the next frame from the reflow path
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aReflowState.reflowCommand->GetNext(nextFrame, PR_TRUE);
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nsReflowStatus kidStatus;
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rv = ReflowAbsoluteFrame(aPresContext, aReflowState, nextFrame,
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PR_FALSE, kidStatus);
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// XXX Make sure the frame is repainted. For the time being, since we
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// have no idea what actually changed repaint it all...
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nsIView* view;
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nextFrame->GetView(&view);
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if (nsnull != view) {
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nsIViewManager* viewMgr;
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view->GetViewManager(viewMgr);
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if (nsnull != viewMgr) {
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viewMgr->UpdateView(view, (nsIRegion*)nsnull, NS_VMREFRESH_NO_SYNC);
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NS_RELEASE(viewMgr);
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}
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}
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handled = PR_TRUE;
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}
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}
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// If we handled the incremental reflow, then we're all done
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if (handled) {
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// Just return our current size as our desired size
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aDesiredSize.width = mRect.width;
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aDesiredSize.height = mRect.height;
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aDesiredSize.ascent = mRect.height;
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aDesiredSize.descent = 0;
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// Whether or not we're complete hasn't changed
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aStatus = (nsnull != mNextInFlow) ? NS_FRAME_NOT_COMPLETE : NS_FRAME_COMPLETE;
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return rv;
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}
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}
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// Let the block frame code handle it. Make a copy of the reflow state so we can
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// set the space manager.
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// Note: we don't do this for absolutely positioned child frames, because they
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// have their own space manager
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nsHTMLReflowState reflowState(aReflowState);
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if (nsnull != mSpaceManager) {
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reflowState.spaceManager = mSpaceManager;
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// Clear the spacemanager's regions.
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mSpaceManager->ClearRegions();
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}
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rv = nsBlockFrame::Reflow(aPresContext, aDesiredSize, reflowState, aStatus);
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// Reflow the absolutely positioned child frames. We need to do this even for
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// an incremental reflow, because some of the absolutely positioned child frames
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// may have 'auto' for an offset
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ReflowAbsoluteFrames(aPresContext, reflowState);
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// Compute our desired size taking into account anything that sticks
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// outside our new size (for example, floaters). Note that if this
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// frame has a height specified by CSS then we don't do this!
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if ((NS_UNCONSTRAINEDSIZE == reflowState.computedHeight) &&
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(NS_FRAME_OUTSIDE_CHILDREN & mState)) {
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nscoord contentYMost = aDesiredSize.height;
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nscoord yMost = aDesiredSize.mCombinedArea.YMost();
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if (yMost > contentYMost) {
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// retain the border+padding for this element after the bottom
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// most object.
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aDesiredSize.height = yMost;
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}
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}
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// XXX This code is really temporary; the lower level frame
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// classes need to contribute to the area that needs damage
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// repair. This class should only worry about damage repairing
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// it's border+padding area.
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nsRect damageArea(0, 0, 0, 0);
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// Decide how much to repaint based on the reflow type.
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// Note: we don't have to handle the initial reflow case and the
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// resize reflow case, because they're handled by the scroll frame
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if (eReflowReason_Incremental == aReflowState.reason) {
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nsIReflowCommand::ReflowType reflowType;
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aReflowState.reflowCommand->GetType(reflowType);
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// For append reflow commands that target the flowed frames just
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// repaint the newly added part of the frame.
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if (nsIReflowCommand::FrameAppended == reflowType) {
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//this blows. we're repainting everything, but we have no choice
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//since we don't know how we got here. see the XXX above for a
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//real fix.
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#if 1
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damageArea.y = 0;
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damageArea.height = aDesiredSize.height;
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damageArea.width = aDesiredSize.width;
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#else
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// It's an append reflow command
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damageArea.y = mRect.YMost();
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damageArea.width = aDesiredSize.width;
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damageArea.height = aDesiredSize.height - mRect.height;
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if ((damageArea.height < 0) ||
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(aDesiredSize.height == mRect.height)) {
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// Since we don't know what changed, assume it all changed.
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damageArea.y = 0;
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damageArea.height = aDesiredSize.height;
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}
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#endif
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} else {
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// Ideally the frame that is the target of the reflow command
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// (or its parent frame) would generate a damage rect, but
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// since none of the frame classes know how to do this then
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// for the time being just repaint the entire frame
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damageArea.width = aDesiredSize.width;
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// If the new height is smaller than the old height then make
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// sure we erase whatever used to be displayed
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damageArea.height = PR_MAX(aDesiredSize.height, mRect.height);
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}
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}
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// 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);
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}
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return rv;
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}
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/////////////////////////////////////////////////////////////////////////////
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// Helper functions
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// XXX Optimize the case where it's a resize reflow and the absolutely
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// positioned child has the exact same size and position and skip the
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// reflow...
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nsresult
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nsAreaFrame::ReflowAbsoluteFrame(nsIPresContext& aPresContext,
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const nsHTMLReflowState& aReflowState,
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nsIFrame* aKidFrame,
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PRBool aInitialReflow,
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nsReflowStatus& aStatus)
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{
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nsresult rv;
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nsMargin border;
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const nsStyleSpacing* spacing =
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(const nsStyleSpacing*)mStyleContext->GetStyleData(eStyleStruct_Spacing);
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spacing->GetBorder(border);
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nsIHTMLReflow* htmlReflow;
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rv = aKidFrame->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow);
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if (NS_SUCCEEDED(rv)) {
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htmlReflow->WillReflow(aPresContext);
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nsSize availSize(aReflowState.computedWidth, NS_UNCONSTRAINEDSIZE);
|
|
nsHTMLReflowMetrics kidDesiredSize(nsnull);
|
|
nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aKidFrame,
|
|
availSize);
|
|
|
|
// If it's the initial reflow, then override the reflow reason. This is
|
|
// used when frames are inserted incrementally
|
|
if (aInitialReflow) {
|
|
kidReflowState.reason = eReflowReason_Initial;
|
|
}
|
|
|
|
rv = htmlReflow->Reflow(aPresContext, kidDesiredSize, kidReflowState, aStatus);
|
|
|
|
// XXX If the child had a fixed height, then make sure it respected it...
|
|
if (NS_AUTOHEIGHT != kidReflowState.computedHeight) {
|
|
if (kidDesiredSize.height < kidReflowState.computedHeight) {
|
|
kidDesiredSize.height = kidReflowState.computedHeight;
|
|
kidDesiredSize.height += kidReflowState.mComputedBorderPadding.top +
|
|
kidReflowState.mComputedBorderPadding.bottom;
|
|
}
|
|
}
|
|
|
|
// 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);
|
|
aKidFrame->SetRect(rect);
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
// Called by Reflow() to reflow the absolutely positioned child frames.
|
|
void
|
|
nsAreaFrame::ReflowAbsoluteFrames(nsIPresContext& aPresContext,
|
|
const nsHTMLReflowState& aReflowState)
|
|
{
|
|
// Make a copy of the reflow state. If the reason is eReflowReason_Incremental,
|
|
// then change it to eReflowReason_Resize
|
|
nsHTMLReflowState reflowState(aReflowState);
|
|
if (eReflowReason_Incremental == reflowState.reason) {
|
|
reflowState.reason = eReflowReason_Resize;
|
|
}
|
|
|
|
nsIFrame* kidFrame;
|
|
for (kidFrame = mAbsoluteFrames.FirstChild(); nsnull != kidFrame; kidFrame->GetNextSibling(&kidFrame)) {
|
|
// Reflow the frame
|
|
nsReflowStatus kidStatus;
|
|
ReflowAbsoluteFrame(aPresContext, reflowState, kidFrame, PR_FALSE,
|
|
kidStatus);
|
|
}
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAreaFrame::GetFrameType(nsIAtom** aType) const
|
|
{
|
|
NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
|
|
*aType = nsLayoutAtoms::areaFrame;
|
|
NS_ADDREF(*aType);
|
|
return NS_OK;
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
// Diagnostics
|
|
|
|
NS_IMETHODIMP
|
|
nsAreaFrame::GetFrameName(nsString& aResult) const
|
|
{
|
|
return MakeFrameName("Area", aResult);
|
|
}
|