зеркало из https://github.com/mozilla/gecko-dev.git
364 строки
12 KiB
C++
364 строки
12 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 "nsSimplePageSequence.h"
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#include "nsPageFrame.h"
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#include "nsIPresContext.h"
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#include "nsIReflowCommand.h"
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#include "nsIRenderingContext.h"
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#include "nsIStyleContext.h"
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#include "nsHTMLAtoms.h"
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#include "nsHTMLIIDs.h"
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#include "nsIDeviceContext.h"
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#include "nsIViewManager.h"
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#include "nsIPresShell.h"
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nsresult
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nsSimplePageSequenceFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
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{
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NS_PRECONDITION(0 != aInstancePtr, "null ptr");
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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(kIPageSequenceFrameIID)) {
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*aInstancePtr = (void*)(nsIPageSequenceFrame*)this;
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return NS_OK;
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}
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return nsContainerFrame::QueryInterface(aIID, aInstancePtr);
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}
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//----------------------------------------------------------------------
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// XXX Hack
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#define PAGE_SPACING_TWIPS 100
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NS_IMETHODIMP
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nsSimplePageSequenceFrame::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("nsSimplePageSequenceFrame::Reflow");
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aStatus = NS_FRAME_COMPLETE;
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// Compute the size of each page and the x coordinate that each page will
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// be placed at
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nsSize pageSize(aPresContext.GetPageWidth(), aPresContext.GetPageHeight());
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PRInt32 extra = aReflowState.maxSize.width - 2*PAGE_SPACING_TWIPS - pageSize.width;
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// Note: nscoord is an unsigned type so don't combine these
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// two statements or the extra will be promoted to unsigned
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// and the >0 won't work!
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nscoord x = PAGE_SPACING_TWIPS;
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if (extra > 0) {
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x += extra / 2;
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}
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// Running y-offset for each page
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nscoord y = PAGE_SPACING_TWIPS;
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if (eReflowReason_Incremental == aReflowState.reason) {
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// We don't expect the target of the reflow command to be the root
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// content frame
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#ifdef NS_DEBUG
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nsIFrame* targetFrame;
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aReflowState.reflowCommand->GetTarget(targetFrame);
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NS_ASSERTION(targetFrame != this, "simple page sequence frame is reflow command target");
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#endif
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// Get the next child frame in the target chain
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nsIFrame* nextFrame;
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aReflowState.reflowCommand->GetNext(nextFrame);
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// Compute the y-offset of this page
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for (nsIFrame* f = mFirstChild; f != nextFrame; f->GetNextSibling(f)) {
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nsSize size;
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f->GetSize(size);
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y += size.height + PAGE_SPACING_TWIPS;
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}
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// Reflow the page
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nsHTMLReflowState kidReflowState(aPresContext, nextFrame, aReflowState, pageSize);
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nsHTMLReflowMetrics kidSize(nsnull);
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// Dispatch the reflow command to our child frame. Allow it to be as high
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// as it wants
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ReflowChild(nextFrame, aPresContext, kidSize, kidReflowState, aStatus);
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// Place and size the page. If the page is narrower than our max width then
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// center it horizontally
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nsRect rect(x, y, kidSize.width, kidSize.height);
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nextFrame->SetRect(rect);
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// XXX Check if the page is complete...
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// Update the y-offset to reflect the remaining pages
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nextFrame->GetNextSibling(nextFrame);
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while (nsnull != nextFrame) {
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nsSize size;
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nextFrame->GetSize(size);
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y += size.height + PAGE_SPACING_TWIPS;
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nextFrame->GetNextSibling(nextFrame);
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}
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} else {
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nsReflowReason reflowReason = aReflowState.reason;
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// Tile the pages vertically
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nsHTMLReflowMetrics kidSize(nsnull);
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for (nsIFrame* kidFrame = mFirstChild; nsnull != kidFrame; ) {
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// Reflow the page
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nsHTMLReflowState kidReflowState(aPresContext, kidFrame,
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aReflowState, pageSize,
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reflowReason);
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nsReflowStatus status;
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// Place and size the page. If the page is narrower than our
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// max width then center it horizontally
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ReflowChild(kidFrame, aPresContext, kidSize, kidReflowState, status);
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kidFrame->SetRect(nsRect(x, y, kidSize.width, kidSize.height));
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y += kidSize.height;
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// Leave a slight gap between the pages
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y += PAGE_SPACING_TWIPS;
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// Is the page complete?
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nsIFrame* kidNextInFlow;
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kidFrame->GetNextInFlow(kidNextInFlow);
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if (NS_FRAME_IS_COMPLETE(status)) {
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NS_ASSERTION(nsnull == kidNextInFlow, "bad child flow list");
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} else if (nsnull == kidNextInFlow) {
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// The page isn't complete and it doesn't have a next-in-flow so
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// create a continuing page
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nsIStyleContext* kidSC;
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kidFrame->GetStyleContext(kidSC);
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nsIFrame* continuingPage;
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nsresult rv = kidFrame->CreateContinuingFrame(aPresContext, this,
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kidSC, continuingPage);
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nsHTMLContainerFrame::CreateViewForFrame(aPresContext, continuingPage,
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kidSC, PR_TRUE);
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NS_RELEASE(kidSC);
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reflowReason = eReflowReason_Initial;
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// Add it to our child list
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#ifdef NS_DEBUG
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nsIFrame* kidNextSibling;
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kidFrame->GetNextSibling(kidNextSibling);
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NS_ASSERTION(nsnull == kidNextSibling, "unexpected sibling");
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#endif
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kidFrame->SetNextSibling(continuingPage);
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}
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// Get the next page
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kidFrame->GetNextSibling(kidFrame);
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}
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}
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// Return our desired size
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aDesiredSize.height = y;
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aDesiredSize.width = 2*PAGE_SPACING_TWIPS + pageSize.width;
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aDesiredSize.ascent = aDesiredSize.height;
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aDesiredSize.descent = 0;
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NS_FRAME_TRACE_REFLOW_OUT("nsSimplePageSequeceFrame::Reflow", aStatus);
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return NS_OK;
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}
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//----------------------------------------------------------------------
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NS_IMETHODIMP
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nsSimplePageSequenceFrame::GetFrameName(nsString& aResult) const
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{
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return MakeFrameName("SimplePageSequence", aResult);
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}
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NS_IMETHODIMP
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nsSimplePageSequenceFrame::Paint(nsIPresContext& aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect)
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{
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// Paint a white background
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aRenderingContext.SetColor(NS_RGB(255,255,255));
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aRenderingContext.FillRect(aDirtyRect);
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// XXX Crop marks or hash marks would be nice. Use style info...
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return nsContainerFrame::Paint(aPresContext, aRenderingContext, aDirtyRect);
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}
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void
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nsSimplePageSequenceFrame::PaintChild(nsIPresContext& aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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nsIFrame* aFrame)
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{
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// Let the page paint
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nsContainerFrame::PaintChild(aPresContext, aRenderingContext,
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aDirtyRect, aFrame);
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// XXX Paint a one-pixel border around the page so it's easy to see where
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// each page begins and ends when we're in print preview mode
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nsRect pageBounds;
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float p2t = aPresContext.GetPixelsToTwips();
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aRenderingContext.SetColor(NS_RGB(0, 0, 0));
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aFrame->GetRect(pageBounds);
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pageBounds.Inflate(p2t, p2t);
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aRenderingContext.DrawRect(pageBounds);
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}
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//----------------------------------------------------------------------
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// Helper function that sends the progress notification. Returns PR_TRUE
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// if printing should continue and PR_FALSE otherwise
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static PRBool
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SendStatusNotification(nsIPrintStatusCallback* aStatusCallback,
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PRInt32 aPageNumber,
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PRInt32 aTotalPages,
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nsPrintStatus aStatus)
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{
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PRBool ret = PR_TRUE;
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if (nsnull != aStatusCallback) {
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aStatusCallback->OnProgress(aPageNumber, aTotalPages, aStatus,ret);
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}
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return ret;
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}
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NS_IMETHODIMP
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nsSimplePageSequenceFrame::Print(nsIPresContext& aPresContext,
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const nsPrintOptions& aPrintOptions,
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nsIPrintStatusCallback* aStatusCallback)
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{
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// If printing a range of pages make sure at least the starting page
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// number is valid
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PRInt32 totalPages = LengthOf(mFirstChild);
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if (ePrintRange_SpecifiedRange == aPrintOptions.range) {
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if (aPrintOptions.startPage > totalPages) {
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return NS_ERROR_INVALID_ARG;
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}
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}
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// Send the notification that we're beginning to print the document
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if (!SendStatusNotification(aStatusCallback, -1, totalPages,
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ePrintStatus_StartDoc)) {
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return NS_ERROR_ABORT; // indicate client cancelled printing
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}
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// Begin printing of the document
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nsIDeviceContext* dc = aPresContext.GetDeviceContext();
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nsresult rv = NS_OK;
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rv = dc->BeginDocument();
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if (NS_FAILED(rv)) {
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if (nsnull != aStatusCallback) {
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aStatusCallback->OnError(ePrintError_Error);
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}
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} else {
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nsIPresShell* presShell = aPresContext.GetShell();
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nsIViewManager* vm = presShell->GetViewManager();
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NS_RELEASE(presShell);
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// Print each specified page
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PRInt32 pageNum = 1;
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for (nsIFrame* page = mFirstChild;
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nsnull != page;
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pageNum++, page->GetNextSibling(page)) {
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// If printing a range of pages check whether the page number is in the
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// range of pages to print
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if (ePrintRange_SpecifiedRange == aPrintOptions.range) {
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if (pageNum < aPrintOptions.startPage) {
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continue;
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} else if (pageNum > aPrintOptions.endPage) {
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break;
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}
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}
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// Start printing of the page
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if (!SendStatusNotification(aStatusCallback, pageNum, totalPages,
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ePrintStatus_StartPage)) {
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rv = NS_ERROR_ABORT;
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break;
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}
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rv = dc->BeginPage();
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if (NS_FAILED(rv)) {
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if (nsnull != aStatusCallback) {
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aStatusCallback->OnError(ePrintError_Error);
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}
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break;
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}
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// Print the page
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nsIView* view;
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page->GetView(view);
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NS_ASSERTION(nsnull != view, "no page view");
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vm->Display(view);
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// Finish printing of the page
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if (!SendStatusNotification(aStatusCallback, pageNum, totalPages,
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ePrintStatus_EndPage)) {
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rv = NS_ERROR_ABORT;
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break;
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}
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rv = dc->EndPage();
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if (NS_FAILED(rv)) {
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if (nsnull != aStatusCallback) {
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aStatusCallback->OnError(ePrintError_Error);
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}
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break;
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}
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}
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// Finish printing of the document
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if (NS_SUCCEEDED(rv)) {
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rv = dc->EndDocument();
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} else {
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// rv = dc->AbortDocument();
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}
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if (NS_FAILED(rv) && (nsnull != aStatusCallback)) {
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aStatusCallback->OnError(ePrintError_Error);
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}
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SendStatusNotification(aStatusCallback, pageNum - 1, totalPages,
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ePrintStatus_EndDoc);
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NS_RELEASE(vm);
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}
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NS_RELEASE(dc);
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return rv;
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}
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//----------------------------------------------------------------------
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nsresult
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NS_NewSimplePageSequenceFrame(nsIFrame*& aResult)
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{
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nsSimplePageSequenceFrame* it = new nsSimplePageSequenceFrame;
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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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aResult = it;
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return NS_OK;
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}
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