mirror of
https://github.com/mozilla/gecko-dev.git
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415 lines
16 KiB
C++
415 lines
16 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 "nsAbsoluteContainingBlock.h"
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#include "nsContainerFrame.h"
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#include "nsHTMLIIDs.h"
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#include "nsIAreaFrame.h"
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#include "nsIReflowCommand.h"
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#include "nsIStyleContext.h"
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#include "nsIViewManager.h"
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#include "nsLayoutAtoms.h"
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#include "nsIReflowCommand.h"
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#include "nsIPresShell.h"
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#include "nsHTMLParts.h"
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static NS_DEFINE_IID(kAreaFrameIID, NS_IAREAFRAME_IID);
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nsresult
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nsAbsoluteContainingBlock::FirstChild(const nsIFrame* aDelegatingFrame,
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nsIAtom* aListName,
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nsIFrame** aFirstChild) const
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{
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NS_PRECONDITION(nsLayoutAtoms::absoluteList == aListName, "unexpected child list name");
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*aFirstChild = mAbsoluteFrames.FirstChild();
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return NS_OK;
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}
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nsresult
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nsAbsoluteContainingBlock::SetInitialChildList(nsIFrame* aDelegatingFrame,
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nsIPresContext& aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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NS_PRECONDITION(nsLayoutAtoms::absoluteList == aListName, "unexpected child list name");
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#ifdef NS_DEBUG
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nsFrame::VerifyDirtyBitSet(aChildList);
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#endif
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mAbsoluteFrames.SetFrames(aChildList);
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return NS_OK;
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}
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nsresult
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nsAbsoluteContainingBlock::AppendFrames(nsIFrame* aDelegatingFrame,
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nsIPresContext& aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aFrameList)
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{
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nsresult rv = NS_OK;
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// Append the frames to our list of absolutely positioned frames
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#ifdef NS_DEBUG
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nsFrame::VerifyDirtyBitSet(aFrameList);
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#endif
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mAbsoluteFrames.AppendFrames(nsnull, aFrameList);
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// Generate a reflow command to reflow the dirty frames
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nsIReflowCommand* reflowCmd;
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rv = NS_NewHTMLReflowCommand(&reflowCmd, aDelegatingFrame, nsIReflowCommand::ReflowDirty);
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if (NS_SUCCEEDED(rv)) {
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reflowCmd->SetChildListName(nsLayoutAtoms::absoluteList);
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aPresShell.AppendReflowCommand(reflowCmd);
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NS_RELEASE(reflowCmd);
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}
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return rv;
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}
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nsresult
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nsAbsoluteContainingBlock::InsertFrames(nsIFrame* aDelegatingFrame,
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nsIPresContext& aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList)
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{
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nsresult rv = NS_OK;
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// Insert the new frames
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#ifdef NS_DEBUG
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nsFrame::VerifyDirtyBitSet(aFrameList);
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#endif
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mAbsoluteFrames.InsertFrames(nsnull, aPrevFrame, aFrameList);
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// Generate a reflow command to reflow the dirty frames
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nsIReflowCommand* reflowCmd;
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rv = NS_NewHTMLReflowCommand(&reflowCmd, aDelegatingFrame, nsIReflowCommand::ReflowDirty);
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if (NS_SUCCEEDED(rv)) {
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reflowCmd->SetChildListName(nsLayoutAtoms::absoluteList);
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aPresShell.AppendReflowCommand(reflowCmd);
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NS_RELEASE(reflowCmd);
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}
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return rv;
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}
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nsresult
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nsAbsoluteContainingBlock::RemoveFrame(nsIFrame* aDelegatingFrame,
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nsIPresContext& aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aOldFrame)
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{
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PRBool result = mAbsoluteFrames.DestroyFrame(aPresContext, aOldFrame);
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NS_ASSERTION(result, "didn't find frame to delete");
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// Because positioned frames aren't part of a flow, there's no additional
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// work to do, e.g. reflowing sibling frames. And because positioned frames
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// have a view, we don't need to repaint
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return result ? NS_OK : NS_ERROR_FAILURE;
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}
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nsresult
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nsAbsoluteContainingBlock::Reflow(nsIFrame* aDelegatingFrame,
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nsIPresContext& aPresContext,
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const nsHTMLReflowState& aReflowState,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight)
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{
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// Make a copy of the reflow state. If the reason is eReflowReason_Incremental,
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// then change it to eReflowReason_Resize
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nsHTMLReflowState reflowState(aReflowState);
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if (eReflowReason_Incremental == reflowState.reason) {
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reflowState.reason = eReflowReason_Resize;
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}
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nsIFrame* kidFrame;
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for (kidFrame = mAbsoluteFrames.FirstChild(); nsnull != kidFrame; kidFrame->GetNextSibling(&kidFrame)) {
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// Reflow the frame
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nsReflowStatus kidStatus;
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ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, reflowState, aContainingBlockWidth,
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aContainingBlockHeight, kidFrame, PR_FALSE, kidStatus);
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}
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return NS_OK;
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}
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nsresult
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nsAbsoluteContainingBlock::IncrementalReflow(nsIFrame* aDelegatingFrame,
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nsIPresContext& aPresContext,
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const nsHTMLReflowState& aReflowState,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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PRBool& aWasHandled)
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{
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// Initialize the OUT paremeter
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aWasHandled = PR_FALSE;
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// See if the reflow command is targeted at us
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nsIFrame* targetFrame;
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aReflowState.reflowCommand->GetTarget(targetFrame);
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if (aReflowState.frame == targetFrame) {
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nsIAtom* listName;
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PRBool isAbsoluteChild;
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// It's targeted at us. See if it's for the positioned child frames
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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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nsIReflowCommand::ReflowType type;
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// Get the type of reflow command
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aReflowState.reflowCommand->GetType(type);
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// The only type of reflow command we expect is that we have dirty
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// child frames to reflow
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NS_ASSERTION(nsIReflowCommand::ReflowDirty, "unexpected reflow type");
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// Walk the positioned frames and reflow the dirty frames
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for (nsIFrame* f = mAbsoluteFrames.FirstChild(); f; f->GetNextSibling(&f)) {
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nsFrameState frameState;
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f->GetFrameState(&frameState);
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if (frameState & NS_FRAME_IS_DIRTY) {
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nsReflowStatus status;
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// Note: the only reason the frame would be dirty would be if it had
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// just been inserted or appended
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NS_ASSERTION(frameState & NS_FRAME_FIRST_REFLOW, "unexpected frame state");
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ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowState,
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aContainingBlockWidth, aContainingBlockHeight, f,
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PR_TRUE, status);
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}
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}
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// Indicate we handled the reflow command
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aWasHandled = 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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ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowState,
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aContainingBlockWidth, aContainingBlockHeight, nextFrame,
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PR_FALSE, kidStatus);
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// We don't need to invalidate anything because the frame should
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// invalidate any area within its frame that needs repainting, and
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// because it has a view if it changes size the view manager will
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// damage the dirty area
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aWasHandled = PR_TRUE;
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}
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}
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return NS_OK;
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}
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void
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nsAbsoluteContainingBlock::DestroyFrames(nsIFrame* aDelegatingFrame,
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nsIPresContext& aPresContext)
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{
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mAbsoluteFrames.DestroyFrames(aPresContext);
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}
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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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nsAbsoluteContainingBlock::ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame,
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nsIPresContext& aPresContext,
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const nsHTMLReflowState& aReflowState,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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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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// Get the border values
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if (!aReflowState.mStyleSpacing->GetBorder(border)) {
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NS_NOTYETIMPLEMENTED("percentage border");
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}
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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.mComputedWidth, NS_UNCONSTRAINEDSIZE);
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nsHTMLReflowMetrics kidDesiredSize(nsnull);
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nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aKidFrame,
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availSize, aContainingBlockWidth,
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aContainingBlockHeight);
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// If it's the initial reflow, then override the reflow reason. This is
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// used when frames are inserted incrementally
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if (aInitialReflow) {
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kidReflowState.reason = eReflowReason_Initial;
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}
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rv = htmlReflow->Reflow(aPresContext, kidDesiredSize, kidReflowState, aStatus);
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// Because we don't know the size of a replaced element until after we reflow
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// it 'auto' margins must be computed now, and we need to take into account
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// min-max information
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if (NS_FRAME_IS_REPLACED(kidReflowState.mFrameType)) {
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// Factor in any minimum and maximum size information
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if (kidDesiredSize.width > kidReflowState.mComputedMaxWidth) {
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kidDesiredSize.width = kidReflowState.mComputedMaxWidth;
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} else if (kidDesiredSize.width < kidReflowState.mComputedMinWidth) {
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kidDesiredSize.width = kidReflowState.mComputedMinWidth;
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}
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if (kidDesiredSize.height > kidReflowState.mComputedMaxHeight) {
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kidDesiredSize.height = kidReflowState.mComputedMaxHeight;
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} else if (kidDesiredSize.height < kidReflowState.mComputedMinHeight) {
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kidDesiredSize.height = kidReflowState.mComputedMinHeight;
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}
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// Get the containing block width/height
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nscoord containingBlockWidth, containingBlockHeight;
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kidReflowState.ComputeContainingBlockRectangle(&aReflowState,
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containingBlockWidth,
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containingBlockHeight);
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// XXX This code belongs in nsHTMLReflowState...
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if ((NS_AUTOMARGIN == kidReflowState.mComputedMargin.left) ||
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(NS_AUTOMARGIN == kidReflowState.mComputedMargin.right)) {
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// Calculate the amount of space for margins
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nscoord availMarginSpace = containingBlockWidth -
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kidReflowState.mComputedOffsets.left - kidReflowState.mComputedBorderPadding.left -
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kidDesiredSize.width - kidReflowState.mComputedBorderPadding.right -
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kidReflowState.mComputedOffsets.right;
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if (NS_AUTOMARGIN == kidReflowState.mComputedMargin.left) {
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if (NS_AUTOMARGIN == kidReflowState.mComputedMargin.right) {
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// Both 'margin-left' and 'margin-right' are 'auto', so they get
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// equal values
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kidReflowState.mComputedMargin.left = availMarginSpace / 2;
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kidReflowState.mComputedMargin.right = availMarginSpace -
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kidReflowState.mComputedMargin.left;
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} else {
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// Just 'margin-left' is 'auto'
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kidReflowState.mComputedMargin.left = availMarginSpace -
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kidReflowState.mComputedMargin.right;
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}
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} else {
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// Just 'margin-right' is 'auto'
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kidReflowState.mComputedMargin.right = availMarginSpace -
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kidReflowState.mComputedMargin.left;
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}
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}
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if ((NS_AUTOMARGIN == kidReflowState.mComputedMargin.top) ||
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(NS_AUTOMARGIN == kidReflowState.mComputedMargin.bottom)) {
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// Calculate the amount of space for margins
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nscoord availMarginSpace = containingBlockHeight -
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kidReflowState.mComputedOffsets.top - kidReflowState.mComputedBorderPadding.top -
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kidDesiredSize.height - kidReflowState.mComputedBorderPadding.bottom -
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kidReflowState.mComputedOffsets.bottom;
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if (NS_AUTOMARGIN == kidReflowState.mComputedMargin.top) {
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if (NS_AUTOMARGIN == kidReflowState.mComputedMargin.bottom) {
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// Both 'margin-top' and 'margin-bottom' are 'auto', so they get
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// equal values
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kidReflowState.mComputedMargin.top = availMarginSpace / 2;
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kidReflowState.mComputedMargin.bottom = availMarginSpace -
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kidReflowState.mComputedMargin.top;
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} else {
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// Just 'margin-top' is 'auto'
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kidReflowState.mComputedMargin.top = availMarginSpace -
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kidReflowState.mComputedMargin.bottom;
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}
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} else {
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// Just 'margin-bottom' is 'auto'
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kidReflowState.mComputedMargin.bottom = availMarginSpace -
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kidReflowState.mComputedMargin.top;
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}
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}
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}
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// XXX If the child had a fixed height, then make sure it respected it...
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if (NS_AUTOHEIGHT != kidReflowState.mComputedHeight) {
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if (kidDesiredSize.height < kidReflowState.mComputedHeight) {
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kidDesiredSize.height = kidReflowState.mComputedHeight;
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kidDesiredSize.height += kidReflowState.mComputedBorderPadding.top +
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kidReflowState.mComputedBorderPadding.bottom;
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}
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}
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// Position the child relative to our padding edge
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nsRect rect(border.left + kidReflowState.mComputedOffsets.left + kidReflowState.mComputedMargin.left,
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border.top + kidReflowState.mComputedOffsets.top + kidReflowState.mComputedMargin.top,
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kidDesiredSize.width, kidDesiredSize.height);
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aKidFrame->SetRect(rect);
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}
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return rv;
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}
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nsresult
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nsAbsoluteContainingBlock::GetPositionedInfo(const nsIFrame* aDelegatingFrame,
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nscoord& aXMost,
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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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