зеркало из https://github.com/mozilla/pjs.git
362 строки
12 KiB
C++
362 строки
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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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 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsCOMPtr.h"
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#include "nsViewportFrame.h"
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#include "nsHTMLParts.h"
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#include "nsLayoutAtoms.h"
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#include "nsIViewManager.h"
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#include "nsIScrollableFrame.h"
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#include "nsIDeviceContext.h"
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#include "nsIPresContext.h"
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#include "nsReflowPath.h"
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#include "nsIPresShell.h"
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nsresult
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NS_NewViewportFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
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{
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NS_PRECONDITION(aNewFrame, "null OUT ptr");
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if (nsnull == aNewFrame) {
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return NS_ERROR_NULL_POINTER;
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}
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ViewportFrame* it = new (aPresShell) ViewportFrame;
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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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*aNewFrame = it;
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return NS_OK;
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}
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NS_IMETHODIMP
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ViewportFrame::Destroy(nsIPresContext* aPresContext)
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{
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mFixedContainer.DestroyFrames(this, aPresContext);
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return nsContainerFrame::Destroy(aPresContext);
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}
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NS_IMETHODIMP
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ViewportFrame::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 = NS_OK;
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// See which child list to add the frames to
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#ifdef NS_DEBUG
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nsFrame::VerifyDirtyBitSet(aChildList);
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#endif
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if (mFixedContainer.GetChildListName() == aListName) {
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rv = mFixedContainer.SetInitialChildList(this, aPresContext, aListName, aChildList);
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}
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else {
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rv = nsContainerFrame::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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ViewportFrame::GetFrameForPoint(nsIPresContext* aPresContext,
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const nsPoint& aPoint,
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nsFramePaintLayer aWhichLayer,
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nsIFrame** aFrame)
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{
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// this should act like a block, so we need to override
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return GetFrameForPointUsing(aPresContext, aPoint, nsnull, aWhichLayer,
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(aWhichLayer == NS_FRAME_PAINT_LAYER_BACKGROUND), aFrame);
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}
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NS_IMETHODIMP
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ViewportFrame::AppendFrames(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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if (mFixedContainer.GetChildListName() == aListName) {
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rv = mFixedContainer.AppendFrames(this, aPresContext, aPresShell,
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aListName, aFrameList);
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}
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else {
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// We only expect incremental changes for our fixed frames
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NS_ERROR("unexpected child list");
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rv = NS_ERROR_INVALID_ARG;
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}
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return rv;
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}
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NS_IMETHODIMP
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ViewportFrame::InsertFrames(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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if (mFixedContainer.GetChildListName() == aListName) {
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rv = mFixedContainer.InsertFrames(this, aPresContext, aPresShell, aListName,
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aPrevFrame, aFrameList);
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}
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else {
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// We only expect incremental changes for our fixed frames
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NS_ERROR("unexpected child list");
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rv = NS_ERROR_INVALID_ARG;
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}
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return rv;
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}
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NS_IMETHODIMP
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ViewportFrame::RemoveFrame(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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nsresult rv = NS_OK;
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if (mFixedContainer.GetChildListName() == aListName) {
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rv = mFixedContainer.RemoveFrame(this, aPresContext, aPresShell, aListName, aOldFrame);
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}
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else {
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// We only expect incremental changes for our fixed frames
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NS_ERROR("unexpected child list");
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rv = NS_ERROR_INVALID_ARG;
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}
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return rv;
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}
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NS_IMETHODIMP
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ViewportFrame::GetAdditionalChildListName(PRInt32 aIndex,
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nsIAtom** aListName) const
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{
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NS_PRECONDITION(aListName, "null OUT parameter pointer");
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NS_PRECONDITION(aIndex >= 0, "illegal index");
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*aListName = nsnull;
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nsresult rv = NS_OK;
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if (0 == aIndex) {
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*aListName = mFixedContainer.GetChildListName();
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NS_ADDREF(*aListName);
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}
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return rv;
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}
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NS_IMETHODIMP
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ViewportFrame::FirstChild(nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame** aFirstChild) const
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{
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NS_PRECONDITION(aFirstChild, "null OUT parameter pointer");
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if (mFixedContainer.GetChildListName() == aListName) {
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mFixedContainer.FirstChild(this, aListName, aFirstChild);
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return NS_OK;
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}
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return nsContainerFrame::FirstChild(aPresContext, aListName, aFirstChild);
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}
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void
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ViewportFrame::AdjustReflowStateForScrollbars(nsIPresContext* aPresContext,
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nsHTMLReflowState& aReflowState) const
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{
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// Calculate how much room is available for fixed frames. That means
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// determining if the viewport is scrollable and whether the vertical and/or
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// horizontal scrollbars are visible
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// Get our prinicpal child frame and see if we're scrollable
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nsIFrame* kidFrame = mFrames.FirstChild();
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nsCOMPtr<nsIScrollableFrame> scrollingFrame(do_QueryInterface(kidFrame));
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if (scrollingFrame) {
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nscoord sbWidth = 0, sbHeight = 0;
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PRBool sbHVisible = PR_FALSE, sbVVisible = PR_FALSE;
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scrollingFrame->GetScrollbarSizes(aPresContext, &sbWidth, &sbHeight);
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scrollingFrame->GetScrollbarVisibility(aPresContext, &sbVVisible, &sbHVisible);
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if (sbVVisible) {
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aReflowState.mComputedWidth -= sbWidth;
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aReflowState.availableWidth -= sbWidth;
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}
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if (sbHVisible) {
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aReflowState.mComputedHeight -= sbHeight;
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}
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}
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}
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NS_IMETHODIMP
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ViewportFrame::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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DO_GLOBAL_REFLOW_COUNT("ViewportFrame", aReflowState.reason);
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DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
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NS_FRAME_TRACE_REFLOW_IN("ViewportFrame::Reflow");
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NS_PRECONDITION(!aDesiredSize.mComputeMEW, "unexpected request");
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// Initialize OUT parameters
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aStatus = NS_FRAME_COMPLETE;
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// Reflow the main content first so that the placeholders of the
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// fixed-position frames will be in the right places on an initial
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// reflow.
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nsRect kidRect(0,0,aReflowState.availableWidth,aReflowState.availableHeight);
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nsresult rv = NS_OK;
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if (mFrames.NotEmpty()) {
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// Deal with a non-incremental reflow or an incremental reflow
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// targeted at our one-and-only principal child frame.
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if (eReflowReason_Incremental != aReflowState.reason ||
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aReflowState.path->HasChild(mFrames.FirstChild())) {
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// Reflow our one-and-only principal child frame
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nsIFrame* kidFrame = mFrames.FirstChild();
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nsHTMLReflowMetrics kidDesiredSize(nsnull);
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nsSize availableSpace(aReflowState.availableWidth,
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aReflowState.availableHeight);
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nsHTMLReflowState kidReflowState(aPresContext, aReflowState,
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kidFrame, availableSpace);
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// Reflow the frame
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kidReflowState.mComputedHeight = aReflowState.availableHeight;
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rv = ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowState,
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0, 0, 0, aStatus);
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kidRect.width = kidDesiredSize.width;
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kidRect.height = kidDesiredSize.height;
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FinishReflowChild(kidFrame, aPresContext, nsnull, kidDesiredSize, 0, 0, 0);
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}
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}
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// If we were flowed initially at both an unconstrained width and height,
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// this is a hint that we should return our child's intrinsic size.
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if ((eReflowReason_Initial == aReflowState.reason ||
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eReflowReason_Resize == aReflowState.reason) &&
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aReflowState.availableWidth == NS_UNCONSTRAINEDSIZE &&
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aReflowState.availableHeight == NS_UNCONSTRAINEDSIZE) {
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aDesiredSize.width = kidRect.width;
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aDesiredSize.height = kidRect.height;
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aDesiredSize.ascent = kidRect.height;
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aDesiredSize.descent = 0;
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}
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else {
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// Return the max size as our desired size
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aDesiredSize.width = aReflowState.availableWidth;
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aDesiredSize.height = aReflowState.availableHeight;
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aDesiredSize.ascent = aReflowState.availableHeight;
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aDesiredSize.descent = 0;
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}
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// Make a copy of the reflow state and change the computed width and height
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// to reflect the available space for the fixed items
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nsHTMLReflowState reflowState(aReflowState);
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AdjustReflowStateForScrollbars(aPresContext, reflowState);
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nsReflowType reflowType = eReflowType_ContentChanged;
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if (aReflowState.path) {
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// XXXwaterson this is more restrictive than the previous code
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// was: it insists that the UserDefined reflow be targeted at
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// _this_ frame.
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nsHTMLReflowCommand *command = aReflowState.path->mReflowCommand;
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if (command)
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command->GetType(reflowType);
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}
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PRBool wasHandled = PR_FALSE;
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if (reflowType != eReflowType_UserDefined &&
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aReflowState.reason == eReflowReason_Incremental) {
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// Incremental reflow
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rv = mFixedContainer.IncrementalReflow(this, aPresContext, reflowState,
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reflowState.mComputedWidth,
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reflowState.mComputedHeight,
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wasHandled);
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}
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if (!wasHandled) {
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// It's the initial reflow or some other non-incremental reflow or
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// IncrementalReflow() didn't handle it. Just reflow all the
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// fixed-pos frames.
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rv = mFixedContainer.Reflow(this, aPresContext, reflowState,
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reflowState.mComputedWidth,
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reflowState.mComputedHeight);
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}
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// If this is an initial reflow, resize reflow, or style change reflow
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// then do a repaint
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if ((eReflowReason_Initial == aReflowState.reason) ||
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(eReflowReason_Resize == aReflowState.reason) ||
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(eReflowReason_StyleChange == aReflowState.reason)) {
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nsRect damageRect(0, 0, aDesiredSize.width, aDesiredSize.height);
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if (!damageRect.IsEmpty()) {
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Invalidate(aPresContext, damageRect, PR_FALSE);
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}
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}
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NS_FRAME_TRACE_REFLOW_OUT("ViewportFrame::Reflow", aStatus);
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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return rv;
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}
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NS_IMETHODIMP
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ViewportFrame::GetFrameType(nsIAtom** aType) const
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{
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NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
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*aType = nsLayoutAtoms::viewportFrame;
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NS_ADDREF(*aType);
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return NS_OK;
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}
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NS_IMETHODIMP
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ViewportFrame::IsPercentageBase(PRBool& aBase) const
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{
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aBase = PR_TRUE;
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return NS_OK;
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}
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#ifdef DEBUG
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NS_IMETHODIMP
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ViewportFrame::GetFrameName(nsAString& aResult) const
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{
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return MakeFrameName(NS_LITERAL_STRING("Viewport"), aResult);
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}
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#endif
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