253 lines
8.2 KiB
C++
253 lines
8.2 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 "nsHTMLParts.h"
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#include "nsContainerFrame.h"
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#include "nsCSSRendering.h"
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#include "nsIDocument.h"
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#include "nsIReflowCommand.h"
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#include "nsIPresContext.h"
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#include "nsIStyleContext.h"
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#include "nsViewsCID.h"
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#include "nsIView.h"
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#include "nsIViewManager.h"
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#include "nsIWidget.h"
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#include "nsHTMLIIDs.h"
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#include "nsPageFrame.h"
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#include "nsIRenderingContext.h"
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#include "nsGUIEvent.h"
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#include "nsDOMEvent.h"
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#include "nsStyleConsts.h"
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#include "nsIViewManager.h"
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#include "nsHTMLAtoms.h"
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#include "nsIEventStateManager.h"
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#include "nsIDeviceContext.h"
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#include "nsIScrollableView.h"
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// Interface IDs
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static NS_DEFINE_IID(kScrollViewIID, NS_ISCROLLABLEVIEW_IID);
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static NS_DEFINE_IID(kIFrameIID, NS_IFRAME_IID);
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/**
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* Root frame class.
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*
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* The root frame is the parent frame for the document element's frame.
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* It only supports having a single child frame which must be one of the
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* following:
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* - scroll frame
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* - area frame
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* - page sequence frame
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*/
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class RootFrame : public nsHTMLContainerFrame {
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public:
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NS_IMETHOD SetInitialChildList(nsIPresContext& aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList);
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NS_IMETHOD 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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NS_IMETHOD HandleEvent(nsIPresContext& aPresContext,
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nsGUIEvent* aEvent,
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nsEventStatus& aEventStatus);
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NS_IMETHOD IsPercentageBase(PRBool& aBase) const {
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aBase = PR_TRUE;
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return NS_OK;
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}
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NS_IMETHOD GetFrameName(nsString& aResult) const;
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protected:
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virtual PRIntn GetSkipSides() const;
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};
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//----------------------------------------------------------------------
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nsresult
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NS_NewRootFrame(nsIFrame*& aResult)
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{
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RootFrame* frame = new RootFrame;
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if (nsnull == frame) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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aResult = frame;
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return NS_OK;
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}
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NS_IMETHODIMP
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RootFrame::SetInitialChildList(nsIPresContext& aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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mFirstChild = aChildList;
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return NS_OK;
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}
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NS_IMETHODIMP
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RootFrame::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_REFLOW_IN("RootFrame::Reflow");
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NS_PRECONDITION(nsnull == aDesiredSize.maxElementSize, "unexpected request");
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// Initialize OUT parameter
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aStatus = NS_FRAME_COMPLETE;
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PRBool isChildInitialReflow = PR_FALSE;
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// Check for an incremental reflow
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if (eReflowReason_Incremental == aReflowState.reason) {
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// See if we're the target frame
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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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nsIReflowCommand::ReflowType reflowType;
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nsIFrame* childFrame;
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// Get the reflow type
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aReflowState.reflowCommand->GetType(reflowType);
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if ((nsIReflowCommand::FrameAppended == reflowType) ||
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(nsIReflowCommand::FrameInserted == reflowType)) {
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NS_ASSERTION(nsnull == mFirstChild, "only one child frame allowed");
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// Insert the frame into the child list
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aReflowState.reflowCommand->GetChildFrame(childFrame);
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mFirstChild = childFrame;
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// It's the child frame's initial reflow
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isChildInitialReflow = PR_TRUE;
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} else if (nsIReflowCommand::FrameRemoved == reflowType) {
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nsIFrame* deletedFrame;
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// Get the child frame we should delete
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aReflowState.reflowCommand->GetChildFrame(deletedFrame);
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NS_ASSERTION(deletedFrame == mFirstChild, "not a child frame");
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// Remove it from the child list
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if (deletedFrame == mFirstChild) {
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mFirstChild = nsnull;
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// Damage the area occupied by the deleted frame
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nsRect damageRect;
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deletedFrame->GetRect(damageRect);
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Invalidate(damageRect, PR_FALSE);
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// Delete the frame
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deletedFrame->DeleteFrame(aPresContext);
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}
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}
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} else {
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nsIFrame* nextFrame;
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// Get the next frame in the reflow chain
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aReflowState.reflowCommand->GetNext(nextFrame);
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NS_ASSERTION(nextFrame == mFirstChild, "unexpected next reflow command frame");
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}
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}
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// Reflow our one and only child frame
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if (nsnull != mFirstChild) {
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// Note: the root frame does not have border or padding...
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nsHTMLReflowMetrics desiredSize(nsnull);
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// We must pass in that the available height is unconstrained, because
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// constrained is only for when we're paginated...
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nsHTMLReflowState kidReflowState(aPresContext, mFirstChild, aReflowState,
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nsSize(aReflowState.maxSize.width, NS_UNCONSTRAINEDSIZE));
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if (isChildInitialReflow) {
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kidReflowState.reason = eReflowReason_Initial;
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kidReflowState.reflowCommand = nsnull;
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}
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// For a height that's 'auto', make the frame as big as the available space
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// minus and top and bottom margins
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if (NS_AUTOHEIGHT == kidReflowState.computedHeight) {
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kidReflowState.computedHeight = aReflowState.maxSize.height -
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kidReflowState.computedTopMargin - kidReflowState.computedTopMargin;
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// Computed height is for the content area so reduce it by the amount of
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// space taken up by border and padding
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nsMargin borderPadding;
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kidReflowState.ComputeBorderPaddingFor(mFirstChild, &aReflowState, borderPadding);
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kidReflowState.computedHeight -= borderPadding.top + borderPadding.bottom;
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}
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// Reflow the frame
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nsIHTMLReflow* htmlReflow;
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if (NS_OK == mFirstChild->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow)) {
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ReflowChild(mFirstChild, aPresContext, desiredSize, kidReflowState, aStatus);
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nsRect rect(kidReflowState.computedLeftMargin, kidReflowState.computedTopMargin,
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desiredSize.width, desiredSize.height);
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mFirstChild->SetRect(rect);
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// XXX We should resolve the details of who/when DidReflow()
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// notifications are sent...
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htmlReflow->DidReflow(aPresContext, NS_FRAME_REFLOW_FINISHED);
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}
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// If this is a resize reflow then do a repaint
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if (eReflowReason_Resize == aReflowState.reason) {
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nsRect damageRect(0, 0, aReflowState.maxSize.width, aReflowState.maxSize.height);
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Invalidate(damageRect, PR_FALSE);
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}
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}
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// Return the max size as our desired size
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aDesiredSize.width = aReflowState.maxSize.width;
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aDesiredSize.height = aReflowState.maxSize.height;
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aDesiredSize.ascent = aDesiredSize.height;
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aDesiredSize.descent = 0;
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NS_FRAME_TRACE_REFLOW_OUT("RootFrame::Reflow", aStatus);
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return NS_OK;
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}
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PRIntn
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RootFrame::GetSkipSides() const
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{
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return 0;
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}
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NS_IMETHODIMP
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RootFrame::HandleEvent(nsIPresContext& aPresContext,
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nsGUIEvent* aEvent,
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nsEventStatus& aEventStatus)
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{
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if (nsEventStatus_eConsumeNoDefault == aEventStatus) {
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return NS_OK;
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}
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if (aEvent->message == NS_MOUSE_LEFT_BUTTON_UP ||
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aEvent->message == NS_MOUSE_MIDDLE_BUTTON_UP ||
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aEvent->message == NS_MOUSE_RIGHT_BUTTON_UP) {
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nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
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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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RootFrame::GetFrameName(nsString& aResult) const
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{
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return MakeFrameName("Root", aResult);
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}
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