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gecko-dev/layout/generic/nsSimplePageSequenceFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsSimplePageSequenceFrame.h"
#include "DateTimeFormat.h"
#include "nsCOMPtr.h"
#include "nsDeviceContext.h"
#include "nsPresContext.h"
#include "gfxContext.h"
#include "nsGkAtoms.h"
#include "nsIPresShell.h"
#include "nsIPrintSettings.h"
#include "nsPageFrame.h"
#include "nsSubDocumentFrame.h"
#include "nsRegion.h"
#include "nsCSSFrameConstructor.h"
#include "nsContentUtils.h"
#include "nsDisplayList.h"
#include "nsHTMLCanvasFrame.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "nsICanvasRenderingContextInternal.h"
#include "nsServiceManagerUtils.h"
#include <algorithm>
#define OFFSET_NOT_SET -1
using namespace mozilla;
using namespace mozilla::dom;
#include "mozilla/Logging.h"
mozilla::LazyLogModule gLayoutPrintingLog("printing-layout");
#define PR_PL(_p1) MOZ_LOG(gLayoutPrintingLog, mozilla::LogLevel::Debug, _p1)
nsSimplePageSequenceFrame*
NS_NewSimplePageSequenceFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsSimplePageSequenceFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSimplePageSequenceFrame)
nsSimplePageSequenceFrame::nsSimplePageSequenceFrame(nsStyleContext* aContext)
: nsContainerFrame(aContext, kClassID)
, mTotalPages(-1)
, mSelectionHeight(-1)
, mYSelOffset(0)
, mCalledBeginPage(false)
, mCurrentCanvasListSetup(false)
{
nscoord halfInch = PresContext()->CSSTwipsToAppUnits(NS_INCHES_TO_TWIPS(0.5));
mMargin.SizeTo(halfInch, halfInch, halfInch, halfInch);
// XXX Unsafe to assume successful allocation
mPageData = new nsSharedPageData();
mPageData->mHeadFootFont =
*PresContext()->GetDefaultFont(kGenericFont_serif,
aContext->StyleFont()->mLanguage);
mPageData->mHeadFootFont.size = nsPresContext::CSSPointsToAppUnits(10);
// Doing this here so we only have to go get these formats once
SetPageNumberFormat("pagenumber", "%1$d", true);
SetPageNumberFormat("pageofpages", "%1$d of %2$d", false);
}
nsSimplePageSequenceFrame::~nsSimplePageSequenceFrame()
{
delete mPageData;
ResetPrintCanvasList();
}
NS_QUERYFRAME_HEAD(nsSimplePageSequenceFrame)
NS_QUERYFRAME_ENTRY(nsIPageSequenceFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
//----------------------------------------------------------------------
void
nsSimplePageSequenceFrame::SetDesiredSize(ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nscoord aWidth,
nscoord aHeight)
{
// Aim to fill the whole size of the document, not only so we
// can act as a background in print preview but also handle overflow
// in child page frames correctly.
// Use availableISize so we don't cause a needless horizontal scrollbar.
WritingMode wm = aReflowInput.GetWritingMode();
nscoord scaledWidth = aWidth * PresContext()->GetPrintPreviewScale();
nscoord scaledHeight = aHeight * PresContext()->GetPrintPreviewScale();
nscoord scaledISize = (wm.IsVertical() ? scaledHeight : scaledWidth);
nscoord scaledBSize = (wm.IsVertical() ? scaledWidth : scaledHeight);
aDesiredSize.ISize(wm) = std::max(scaledISize, aReflowInput.AvailableISize());
aDesiredSize.BSize(wm) = std::max(scaledBSize, aReflowInput.ComputedBSize());
}
// Helper function to compute the offset needed to center a child
// page-frame's margin-box inside our content-box.
nscoord
nsSimplePageSequenceFrame::ComputeCenteringMargin(
nscoord aContainerContentBoxWidth,
nscoord aChildPaddingBoxWidth,
const nsMargin& aChildPhysicalMargin)
{
// We'll be centering our child's margin-box, so get the size of that:
nscoord childMarginBoxWidth =
aChildPaddingBoxWidth + aChildPhysicalMargin.LeftRight();
// When rendered, our child's rect will actually be scaled up by the
// print-preview scale factor, via ComputePageSequenceTransform().
// We really want to center *that scaled-up rendering* inside of
// aContainerContentBoxWidth. So, we scale up its margin-box here...
auto ppScale = PresContext()->GetPrintPreviewScale();
nscoord scaledChildMarginBoxWidth =
NSToCoordRound(childMarginBoxWidth * ppScale);
// ...and see we how much space is left over, when we subtract that scaled-up
// size from the container width:
nscoord scaledExtraSpace =
aContainerContentBoxWidth - scaledChildMarginBoxWidth;
if (scaledExtraSpace <= 0) {
// (Don't bother centering if there's zero/negative space.)
return 0;
}
// To center the child, we want to give it an additional left-margin of half
// of the extra space. And then, we have to scale that space back down, so
// that it'll produce the correct scaled-up amount when we render (because
// rendering will scale it back up):
return NSToCoordRound(scaledExtraSpace * 0.5 / ppScale);
}
/*
* Note: we largely position/size out our children (page frames) using
* \*physical\* x/y/width/height values, because the print preview UI is always
* arranged in the same orientation, regardless of writing mode.
*/
void
nsSimplePageSequenceFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus)
{
MarkInReflow();
NS_PRECONDITION(aPresContext->IsRootPaginatedDocument(),
"A Page Sequence is only for real pages");
DO_GLOBAL_REFLOW_COUNT("nsSimplePageSequenceFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
NS_FRAME_TRACE_REFLOW_IN("nsSimplePageSequenceFrame::Reflow");
aStatus.Reset(); // we're always complete
// Don't do incremental reflow until we've taught tables how to do
// it right in paginated mode.
if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
// Return our desired size
SetDesiredSize(aDesiredSize, aReflowInput, mSize.width, mSize.height);
aDesiredSize.SetOverflowAreasToDesiredBounds();
FinishAndStoreOverflow(&aDesiredSize);
if (GetRect().Width() != aDesiredSize.Width()) {
// Our width is changing; we need to re-center our children (our pages).
for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
nsMargin pageCSSMargin = child->GetUsedMargin();
nscoord centeringMargin =
ComputeCenteringMargin(aReflowInput.ComputedWidth(),
child->GetRect().Width(),
pageCSSMargin);
nscoord newX = pageCSSMargin.left + centeringMargin;
// Adjust the child's x-position:
child->MovePositionBy(nsPoint(newX - child->GetNormalPosition().x, 0));
}
}
return;
}
// See if we can get a Print Settings from the Context
if (!mPageData->mPrintSettings &&
aPresContext->Medium() == nsGkAtoms::print) {
mPageData->mPrintSettings = aPresContext->GetPrintSettings();
}
// now get out margins & edges
if (mPageData->mPrintSettings) {
nsIntMargin unwriteableTwips;
mPageData->mPrintSettings->GetUnwriteableMarginInTwips(unwriteableTwips);
NS_ASSERTION(unwriteableTwips.left >= 0 && unwriteableTwips.top >= 0 &&
unwriteableTwips.right >= 0 && unwriteableTwips.bottom >= 0,
"Unwriteable twips should be non-negative");
nsIntMargin marginTwips;
mPageData->mPrintSettings->GetMarginInTwips(marginTwips);
mMargin = aPresContext->CSSTwipsToAppUnits(marginTwips + unwriteableTwips);
int16_t printType;
mPageData->mPrintSettings->GetPrintRange(&printType);
mPrintRangeType = printType;
nsIntMargin edgeTwips;
mPageData->mPrintSettings->GetEdgeInTwips(edgeTwips);
// sanity check the values. three inches are sometimes needed
int32_t inchInTwips = NS_INCHES_TO_INT_TWIPS(3.0);
edgeTwips.top = clamped(edgeTwips.top, 0, inchInTwips);
edgeTwips.bottom = clamped(edgeTwips.bottom, 0, inchInTwips);
edgeTwips.left = clamped(edgeTwips.left, 0, inchInTwips);
edgeTwips.right = clamped(edgeTwips.right, 0, inchInTwips);
mPageData->mEdgePaperMargin =
aPresContext->CSSTwipsToAppUnits(edgeTwips + unwriteableTwips);
}
// *** Special Override ***
// If this is a sub-sdoc (meaning it doesn't take the whole page)
// and if this Document is in the upper left hand corner
// we need to suppress the top margin or it will reflow too small
nsSize pageSize = aPresContext->GetPageSize();
mPageData->mReflowSize = pageSize;
// If we're printing a selection, we need to reflow with
// unconstrained height, to make sure we'll get to the selection
// even if it's beyond the first page of content.
if (nsIPrintSettings::kRangeSelection == mPrintRangeType) {
mPageData->mReflowSize.height = NS_UNCONSTRAINEDSIZE;
}
mPageData->mReflowMargin = mMargin;
// We use the CSS "margin" property on the -moz-page pseudoelement
// to determine the space between each page in print preview.
// Keep a running y-offset for each page.
nscoord y = 0;
nscoord maxXMost = 0;
// Tile the pages vertically
ReflowOutput kidSize(aReflowInput);
for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
nsIFrame* kidFrame = e.get();
// Set the shared data into the page frame before reflow
nsPageFrame * pf = static_cast<nsPageFrame*>(kidFrame);
pf->SetSharedPageData(mPageData);
// Reflow the page
ReflowInput kidReflowInput(aPresContext, aReflowInput, kidFrame,
LogicalSize(kidFrame->GetWritingMode(),
pageSize));
nsReflowStatus status;
kidReflowInput.SetComputedISize(kidReflowInput.AvailableISize());
//kidReflowInput.SetComputedHeight(kidReflowInput.AvailableHeight());
PR_PL(("AV ISize: %d BSize: %d\n",
kidReflowInput.AvailableISize(),
kidReflowInput.AvailableBSize()));
nsMargin pageCSSMargin = kidReflowInput.ComputedPhysicalMargin();
y += pageCSSMargin.top;
nscoord x = pageCSSMargin.left;
// Place and size the page.
ReflowChild(kidFrame, aPresContext, kidSize, kidReflowInput, x, y, 0, status);
// If the page is narrower than our width, then center it horizontally:
x += ComputeCenteringMargin(aReflowInput.ComputedWidth(),
kidSize.Width(), pageCSSMargin);
FinishReflowChild(kidFrame, aPresContext, kidSize, nullptr, x, y, 0);
y += kidSize.Height();
y += pageCSSMargin.bottom;
maxXMost = std::max(maxXMost, x + kidSize.Width() + pageCSSMargin.right);
// Is the page complete?
nsIFrame* kidNextInFlow = kidFrame->GetNextInFlow();
if (status.IsFullyComplete()) {
NS_ASSERTION(!kidNextInFlow, "bad child flow list");
} else if (!kidNextInFlow) {
// The page isn't complete and it doesn't have a next-in-flow, so
// create a continuing page.
nsIFrame* continuingPage = aPresContext->PresShell()->FrameConstructor()->
CreateContinuingFrame(aPresContext, kidFrame, this);
// Add it to our child list
mFrames.InsertFrame(nullptr, kidFrame, continuingPage);
}
}
// Get Total Page Count
// XXXdholbert technically we could calculate this in the loop above,
// instead of needing a separate walk.
int32_t pageTot = mFrames.GetLength();
// Set Page Number Info
int32_t pageNum = 1;
for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
MOZ_ASSERT(e.get()->IsPageFrame(),
"only expecting nsPageFrame children. Other children will make "
"this static_cast bogus & probably violate other assumptions");
nsPageFrame* pf = static_cast<nsPageFrame*>(e.get());
pf->SetPageNumInfo(pageNum, pageTot);
pageNum++;
}
nsAutoString formattedDateString;
time_t ltime;
time( &ltime );
if (NS_SUCCEEDED(DateTimeFormat::FormatTime(kDateFormatShort,
kTimeFormatNoSeconds,
ltime,
formattedDateString))) {
SetDateTimeStr(formattedDateString);
}
// Return our desired size
// Adjust the reflow size by PrintPreviewScale so the scrollbars end up the
// correct size
SetDesiredSize(aDesiredSize, aReflowInput, maxXMost, y);
aDesiredSize.SetOverflowAreasToDesiredBounds();
FinishAndStoreOverflow(&aDesiredSize);
// cache the size so we can set the desired size
// for the other reflows that happen
mSize.width = maxXMost;
mSize.height = y;
NS_FRAME_TRACE_REFLOW_OUT("nsSimplePageSequeceFrame::Reflow", aStatus);
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}
//----------------------------------------------------------------------
#ifdef DEBUG_FRAME_DUMP
nsresult
nsSimplePageSequenceFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("SimplePageSequence"), aResult);
}
#endif
//====================================================================
//== Asynch Printing
//====================================================================
NS_IMETHODIMP
nsSimplePageSequenceFrame::GetCurrentPageNum(int32_t* aPageNum)
{
NS_ENSURE_ARG_POINTER(aPageNum);
*aPageNum = mPageNum;
return NS_OK;
}
NS_IMETHODIMP
nsSimplePageSequenceFrame::GetNumPages(int32_t* aNumPages)
{
NS_ENSURE_ARG_POINTER(aNumPages);
*aNumPages = mTotalPages;
return NS_OK;
}
NS_IMETHODIMP
nsSimplePageSequenceFrame::IsDoingPrintRange(bool* aDoing)
{
NS_ENSURE_ARG_POINTER(aDoing);
*aDoing = mDoingPageRange;
return NS_OK;
}
NS_IMETHODIMP
nsSimplePageSequenceFrame::GetPrintRange(int32_t* aFromPage, int32_t* aToPage)
{
NS_ENSURE_ARG_POINTER(aFromPage);
NS_ENSURE_ARG_POINTER(aToPage);
*aFromPage = mFromPageNum;
*aToPage = mToPageNum;
return NS_OK;
}
// Helper Function
void
nsSimplePageSequenceFrame::SetPageNumberFormat(const char* aPropName, const char* aDefPropVal, bool aPageNumOnly)
{
// Doing this here so we only have to go get these formats once
nsXPIDLString pageNumberFormat;
// Now go get the Localized Page Formating String
nsresult rv =
nsContentUtils::GetLocalizedString(nsContentUtils::ePRINTING_PROPERTIES,
aPropName, pageNumberFormat);
if (NS_FAILED(rv)) { // back stop formatting
pageNumberFormat.AssignASCII(aDefPropVal);
}
SetPageNumberFormat(pageNumberFormat, aPageNumOnly);
}
NS_IMETHODIMP
nsSimplePageSequenceFrame::StartPrint(nsPresContext* aPresContext,
nsIPrintSettings* aPrintSettings,
const nsAString& aDocTitle,
const nsAString& aDocURL)
{
NS_ENSURE_ARG_POINTER(aPresContext);
NS_ENSURE_ARG_POINTER(aPrintSettings);
if (!mPageData->mPrintSettings) {
mPageData->mPrintSettings = aPrintSettings;
}
if (!aDocTitle.IsEmpty()) {
mPageData->mDocTitle = aDocTitle;
}
if (!aDocURL.IsEmpty()) {
mPageData->mDocURL = aDocURL;
}
aPrintSettings->GetStartPageRange(&mFromPageNum);
aPrintSettings->GetEndPageRange(&mToPageNum);
aPrintSettings->GetPageRanges(mPageRanges);
mDoingPageRange = nsIPrintSettings::kRangeSpecifiedPageRange == mPrintRangeType ||
nsIPrintSettings::kRangeSelection == mPrintRangeType;
// If printing a range of pages make sure at least the starting page
// number is valid
int32_t totalPages = mFrames.GetLength();
if (mDoingPageRange) {
if (mFromPageNum > totalPages) {
return NS_ERROR_INVALID_ARG;
}
}
// Begin printing of the document
nsresult rv = NS_OK;
// Determine if we are rendering only the selection
aPresContext->SetIsRenderingOnlySelection(nsIPrintSettings::kRangeSelection == mPrintRangeType);
if (mDoingPageRange) {
// XXX because of the hack for making the selection all print on one page
// we must make sure that the page is sized correctly before printing.
nscoord height = aPresContext->GetPageSize().height;
int32_t pageNum = 1;
nscoord y = 0;//mMargin.top;
for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
nsIFrame* page = e.get();
if (pageNum >= mFromPageNum && pageNum <= mToPageNum) {
nsRect rect = page->GetRect();
rect.y = y;
rect.height = height;
page->SetRect(rect);
y += rect.height + mMargin.top + mMargin.bottom;
}
pageNum++;
}
// adjust total number of pages
if (nsIPrintSettings::kRangeSelection != mPrintRangeType) {
totalPages = pageNum - 1;
}
}
mPageNum = 1;
if (mTotalPages == -1) {
mTotalPages = totalPages;
}
return rv;
}
void
GetPrintCanvasElementsInFrame(nsIFrame* aFrame, nsTArray<RefPtr<HTMLCanvasElement> >* aArr)
{
if (!aFrame) {
return;
}
for (nsIFrame::ChildListIterator childLists(aFrame);
!childLists.IsDone(); childLists.Next()) {
nsFrameList children = childLists.CurrentList();
for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
// Check if child is a nsHTMLCanvasFrame.
nsHTMLCanvasFrame* canvasFrame = do_QueryFrame(child);
// If there is a canvasFrame, try to get actual canvas element.
if (canvasFrame) {
HTMLCanvasElement* canvas =
HTMLCanvasElement::FromContentOrNull(canvasFrame->GetContent());
if (canvas && canvas->GetMozPrintCallback()) {
aArr->AppendElement(canvas);
continue;
}
}
if (!child->PrincipalChildList().FirstChild()) {
nsSubDocumentFrame* subdocumentFrame = do_QueryFrame(child);
if (subdocumentFrame) {
// Descend into the subdocument
nsIFrame* root = subdocumentFrame->GetSubdocumentRootFrame();
child = root;
}
}
// The current child is not a nsHTMLCanvasFrame OR it is but there is
// no HTMLCanvasElement on it. Check if children of `child` might
// contain a HTMLCanvasElement.
GetPrintCanvasElementsInFrame(child, aArr);
}
}
}
void
nsSimplePageSequenceFrame::DetermineWhetherToPrintPage()
{
// See whether we should print this page
mPrintThisPage = true;
bool printEvenPages, printOddPages;
mPageData->mPrintSettings->GetPrintOptions(nsIPrintSettings::kPrintEvenPages, &printEvenPages);
mPageData->mPrintSettings->GetPrintOptions(nsIPrintSettings::kPrintOddPages, &printOddPages);
// If printing a range of pages check whether the page number is in the
// range of pages to print
if (mDoingPageRange) {
if (mPageNum < mFromPageNum) {
mPrintThisPage = false;
} else if (mPageNum > mToPageNum) {
mPageNum++;
mPrintThisPage = false;
return;
} else {
int32_t length = mPageRanges.Length();
// Page ranges are pairs (start, end)
if (length && (length % 2 == 0)) {
mPrintThisPage = false;
int32_t i;
for (i = 0; i < length; i += 2) {
if (mPageRanges[i] <= mPageNum && mPageNum <= mPageRanges[i+1]) {
mPrintThisPage = true;
break;
}
}
}
}
}
// Check for printing of odd and even pages
if (mPageNum & 0x1) {
if (!printOddPages) {
mPrintThisPage = false; // don't print odd numbered page
}
} else {
if (!printEvenPages) {
mPrintThisPage = false; // don't print even numbered page
}
}
if (nsIPrintSettings::kRangeSelection == mPrintRangeType) {
mPrintThisPage = true;
}
}
nsIFrame*
nsSimplePageSequenceFrame::GetCurrentPageFrame()
{
int32_t i = 1;
for (nsFrameList::Enumerator childFrames(mFrames); !childFrames.AtEnd();
childFrames.Next()) {
if (i == mPageNum) {
return childFrames.get();
}
++i;
}
return nullptr;
}
NS_IMETHODIMP
nsSimplePageSequenceFrame::PrePrintNextPage(nsITimerCallback* aCallback, bool* aDone)
{
nsIFrame* currentPage = GetCurrentPageFrame();
if (!currentPage) {
*aDone = true;
return NS_ERROR_FAILURE;
}
DetermineWhetherToPrintPage();
// Nothing to do if the current page doesn't get printed OR rendering to
// preview. For preview, the `CallPrintCallback` is called from within the
// HTMLCanvasElement::HandlePrintCallback.
if (!mPrintThisPage || !PresContext()->IsRootPaginatedDocument()) {
*aDone = true;
return NS_OK;
}
// If the canvasList is null, then generate it and start the render
// process for all the canvas.
if (!mCurrentCanvasListSetup) {
mCurrentCanvasListSetup = true;
GetPrintCanvasElementsInFrame(currentPage, &mCurrentCanvasList);
if (mCurrentCanvasList.Length() != 0) {
nsresult rv = NS_OK;
// Begin printing of the document
nsDeviceContext *dc = PresContext()->DeviceContext();
PR_PL(("\n"));
PR_PL(("***************** BeginPage *****************\n"));
rv = dc->BeginPage();
NS_ENSURE_SUCCESS(rv, rv);
mCalledBeginPage = true;
RefPtr<gfxContext> renderingContext = dc->CreateRenderingContext();
NS_ENSURE_TRUE(renderingContext, NS_ERROR_OUT_OF_MEMORY);
DrawTarget* drawTarget = renderingContext->GetDrawTarget();
if (NS_WARN_IF(!drawTarget)) {
return NS_ERROR_FAILURE;
}
for (int32_t i = mCurrentCanvasList.Length() - 1; i >= 0 ; i--) {
HTMLCanvasElement* canvas = mCurrentCanvasList[i];
nsIntSize size = canvas->GetSize();
RefPtr<DrawTarget> canvasTarget =
drawTarget->CreateSimilarDrawTarget(size, drawTarget->GetFormat());
if (!canvasTarget) {
continue;
}
nsICanvasRenderingContextInternal* ctx = canvas->GetContextAtIndex(0);
if (!ctx) {
continue;
}
// Initialize the context with the new DrawTarget.
ctx->InitializeWithDrawTarget(nullptr, WrapNotNull(canvasTarget));
// Start the rendering process.
AutoWeakFrame weakFrame = this;
canvas->DispatchPrintCallback(aCallback);
NS_ENSURE_STATE(weakFrame.IsAlive());
}
}
}
uint32_t doneCounter = 0;
for (int32_t i = mCurrentCanvasList.Length() - 1; i >= 0 ; i--) {
HTMLCanvasElement* canvas = mCurrentCanvasList[i];
if (canvas->IsPrintCallbackDone()) {
doneCounter++;
}
}
// If all canvas have finished rendering, return true, otherwise false.
*aDone = doneCounter == mCurrentCanvasList.Length();
return NS_OK;
}
NS_IMETHODIMP
nsSimplePageSequenceFrame::ResetPrintCanvasList()
{
for (int32_t i = mCurrentCanvasList.Length() - 1; i >= 0 ; i--) {
HTMLCanvasElement* canvas = mCurrentCanvasList[i];
canvas->ResetPrintCallback();
}
mCurrentCanvasList.Clear();
mCurrentCanvasListSetup = false;
return NS_OK;
}
NS_IMETHODIMP
nsSimplePageSequenceFrame::PrintNextPage()
{
// This method would be very straightforward except that the
// "Print Selection Only" functionality (which is a broken mess) is
// integrated here. The thing to understand is that if we're printing a
// selection (which may contain multiple ranges) then we only enter this
// function once since the content to print is laid out as one arbitrarily
// long nsPageFrame instead of multiple nsPageFrames that are sized to fit
// the printer paper size(!). Each of the "pages" between the start and end
// of the selection are printed by offsetting the nsPageContentFrame by the
// index of the page being printed and then drawing the nsPageContentFrame.
// This does not work for IFrames.
//
// Note: When print al the pages or a page range the printed page shows the
// actual page number, when printing selection it prints the page number starting
// with the first page of the selection. For example if the user has a
// selection that starts on page 2 and ends on page 3, the page numbers when
// print are 1 and then two (which is different than printing a page range, where
// the page numbers would have been 2 and then 3)
nsIFrame* currentPageFrame = GetCurrentPageFrame();
if (!currentPageFrame) {
return NS_ERROR_FAILURE;
}
nsresult rv = NS_OK;
DetermineWhetherToPrintPage();
if (mPrintThisPage) {
nsDeviceContext* dc = PresContext()->DeviceContext();
nsPageFrame * pf = static_cast<nsPageFrame*>(currentPageFrame);
pf->SetPageNumInfo(mPageNum, mTotalPages);
pf->SetSharedPageData(mPageData);
// Only used if we're printing a selection:
nsIFrame* selectionContentFrame = nullptr;
nscoord pageContentHeight =
PresContext()->GetPageSize().height - (mMargin.top + mMargin.bottom);
nscoord selectionY = pageContentHeight;
int32_t selectionCurrentPageNum = 1;
bool haveUnfinishedSelectionToPrint = false;
if (mSelectionHeight >= 0) {
selectionContentFrame = currentPageFrame->PrincipalChildList().FirstChild();
MOZ_ASSERT(selectionContentFrame->IsPageContentFrame() &&
!selectionContentFrame->GetNextSibling(),
"Unexpected frame tree");
// To print a selection we reposition the page content frame for each
// page. We can do this (and not have to bother resetting the position
// after we're done) because we are printing from a static clone document
// that is thrown away after we finish printing.
selectionContentFrame->SetPosition(selectionContentFrame->GetPosition() +
nsPoint(0, -mYSelOffset));
nsContainerFrame::PositionChildViews(selectionContentFrame);
}
do {
if (PresContext()->IsRootPaginatedDocument()) {
if (!mCalledBeginPage) {
// We must make sure BeginPage() has been called since some printing
// backends can't give us a valid rendering context for a [physical]
// page otherwise.
PR_PL(("\n"));
PR_PL(("***************** BeginPage *****************\n"));
rv = dc->BeginPage();
NS_ENSURE_SUCCESS(rv, rv);
}
// Reset this flag. We reset it early here because if we loop around to
// print another page's worth of selection we need to call BeginPage
// again:
mCalledBeginPage = false;
}
PR_PL(("SeqFr::PrintNextPage -> %p PageNo: %d", pf, mPageNum));
// CreateRenderingContext can fail
RefPtr<gfxContext> gCtx = dc->CreateRenderingContext();
NS_ENSURE_TRUE(gCtx, NS_ERROR_OUT_OF_MEMORY);
nsRect drawingRect(nsPoint(0, 0), currentPageFrame->GetSize());
nsRegion drawingRegion(drawingRect);
nsLayoutUtils::PaintFrame(gCtx, currentPageFrame,
drawingRegion, NS_RGBA(0,0,0,0),
nsDisplayListBuilderMode::PAINTING,
nsLayoutUtils::PaintFrameFlags::PAINT_SYNC_DECODE_IMAGES);
if (mSelectionHeight >= 0) {
haveUnfinishedSelectionToPrint = (selectionY < mSelectionHeight);
if (haveUnfinishedSelectionToPrint) {
selectionY += pageContentHeight;
selectionCurrentPageNum++;
pf->SetPageNumInfo(selectionCurrentPageNum, mTotalPages);
selectionContentFrame->SetPosition(selectionContentFrame->GetPosition() +
nsPoint(0, -pageContentHeight));
nsContainerFrame::PositionChildViews(selectionContentFrame);
// We're going to loop and call BeginPage to print another page's worth
// of selection so we need to call EndPage first. (Otherwise, EndPage
// is called in DoEndPage.)
PR_PL(("***************** End Page (PrintNextPage) *****************\n"));
rv = dc->EndPage();
NS_ENSURE_SUCCESS(rv, rv);
}
}
} while (haveUnfinishedSelectionToPrint);
}
return rv;
}
NS_IMETHODIMP
nsSimplePageSequenceFrame::DoPageEnd()
{
nsresult rv = NS_OK;
if (PresContext()->IsRootPaginatedDocument() && mPrintThisPage) {
PR_PL(("***************** End Page (DoPageEnd) *****************\n"));
rv = PresContext()->DeviceContext()->EndPage();
NS_ENSURE_SUCCESS(rv, rv);
}
ResetPrintCanvasList();
mPageNum++;
return rv;
}
inline gfx::Matrix4x4
ComputePageSequenceTransform(nsIFrame* aFrame, float aAppUnitsPerPixel)
{
float scale = aFrame->PresContext()->GetPrintPreviewScale();
return gfx::Matrix4x4::Scaling(scale, scale, 1);
}
void
nsSimplePageSequenceFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
DisplayBorderBackgroundOutline(aBuilder, aLists);
nsDisplayList content;
{
// Clear clip state while we construct the children of the
// nsDisplayTransform, since they'll be in a different coordinate system.
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
clipState.Clear();
nsIFrame* child = PrincipalChildList().FirstChild();
nsRect dirty = aDirtyRect;
dirty.ScaleInverseRoundOut(PresContext()->GetPrintPreviewScale());
while (child) {
if (child->GetVisualOverflowRectRelativeToParent().Intersects(dirty)) {
child->BuildDisplayListForStackingContext(aBuilder,
dirty - child->GetPosition(), &content);
aBuilder->ResetMarkedFramesForDisplayList();
}
child = child->GetNextSibling();
}
}
content.AppendNewToTop(new (aBuilder)
nsDisplayTransform(aBuilder, this, &content, content.GetVisibleRect(),
::ComputePageSequenceTransform));
aLists.Content()->AppendToTop(&content);
}
//------------------------------------------------------------------------------
void
nsSimplePageSequenceFrame::SetPageNumberFormat(const nsAString& aFormatStr, bool aForPageNumOnly)
{
NS_ASSERTION(mPageData != nullptr, "mPageData string cannot be null!");
if (aForPageNumOnly) {
mPageData->mPageNumFormat = aFormatStr;
} else {
mPageData->mPageNumAndTotalsFormat = aFormatStr;
}
}
//------------------------------------------------------------------------------
void
nsSimplePageSequenceFrame::SetDateTimeStr(const nsAString& aDateTimeStr)
{
NS_ASSERTION(mPageData != nullptr, "mPageData string cannot be null!");
mPageData->mDateTimeStr = aDateTimeStr;
}
//------------------------------------------------------------------------------
// For Shrink To Fit
//
// Return the percentage that the page needs to shrink to
//
NS_IMETHODIMP
nsSimplePageSequenceFrame::GetSTFPercent(float& aSTFPercent)
{
NS_ENSURE_TRUE(mPageData, NS_ERROR_UNEXPECTED);
aSTFPercent = mPageData->mShrinkToFitRatio;
return NS_OK;
}
void
nsSimplePageSequenceFrame::AppendDirectlyOwnedAnonBoxes(
nsTArray<OwnedAnonBox>& aResult)
{
if (mFrames.NotEmpty()) {
aResult.AppendElement(mFrames.FirstChild());
}
}
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