github/electron
1
1
Fork 0
mirror of https://github.com/electron/electron.git synced 2026-02-17 10:31:38 -05:00
Code Issues Packages Projects Releases Wiki Activity
Files
2cf0843f82af4eae283ad759d806360973bbd869
electron/chromium_src/chrome/renderer/printing/print_web_view_helper.cc
Cheng Zhao a2bd55dd3c Adapt to changes of Chrome 51 API changes (Part 2)
2016-05-23 12:29:14 +09:00

1450 lines
49 KiB
C++
Raw Blame History

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/renderer/printing/print_web_view_helper.h"
#include <string>
#include "base/auto_reset.h"
#include "base/command_line.h"
#include "base/json/json_writer.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/histogram.h"
#include "base/process/process_handle.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/common/print_messages.h"
#include "content/public/common/web_preferences.h"
#include "content/public/renderer/render_frame.h"
#include "content/public/renderer/render_thread.h"
#include "content/public/renderer/render_view.h"
#include "net/base/escape.h"
#include "printing/pdf_metafile_skia.h"
#include "printing/units.h"
#include "third_party/WebKit/public/platform/WebSize.h"
#include "third_party/WebKit/public/platform/WebURLRequest.h"
#include "third_party/WebKit/public/web/WebConsoleMessage.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebElement.h"
#include "third_party/WebKit/public/web/WebFrameClient.h"
#include "third_party/WebKit/public/web/WebLocalFrame.h"
#include "third_party/WebKit/public/web/WebPlugin.h"
#include "third_party/WebKit/public/web/WebPluginDocument.h"
#include "third_party/WebKit/public/web/WebPrintParams.h"
#include "third_party/WebKit/public/web/WebPrintScalingOption.h"
#include "third_party/WebKit/public/web/WebScriptSource.h"
#include "third_party/WebKit/public/web/WebSettings.h"
#include "third_party/WebKit/public/web/WebView.h"
#include "third_party/WebKit/public/web/WebViewClient.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "ui/base/resource/resource_bundle.h"
using content::WebPreferences;
namespace printing {
namespace {
const double kMinDpi = 1.0;
int GetDPI(const PrintMsg_Print_Params* print_params) {
#if defined(OS_MACOSX)
// On the Mac, the printable area is in points, don't do any scaling based
// on dpi.
return kPointsPerInch;
#else
return static_cast<int>(print_params->dpi);
#endif // defined(OS_MACOSX)
}
bool PrintMsg_Print_Params_IsValid(const PrintMsg_Print_Params& params) {
return !params.content_size.IsEmpty() && !params.page_size.IsEmpty() &&
!params.printable_area.IsEmpty() && params.document_cookie &&
params.desired_dpi && params.dpi && params.margin_top >= 0 &&
params.margin_left >= 0 && params.dpi > kMinDpi &&
params.document_cookie != 0;
}
PrintMsg_Print_Params GetCssPrintParams(
blink::WebFrame* frame,
int page_index,
const PrintMsg_Print_Params& page_params) {
PrintMsg_Print_Params page_css_params = page_params;
int dpi = GetDPI(&page_params);
blink::WebSize page_size_in_pixels(
ConvertUnit(page_params.page_size.width(), dpi, kPixelsPerInch),
ConvertUnit(page_params.page_size.height(), dpi, kPixelsPerInch));
int margin_top_in_pixels =
ConvertUnit(page_params.margin_top, dpi, kPixelsPerInch);
int margin_right_in_pixels = ConvertUnit(
page_params.page_size.width() -
page_params.content_size.width() - page_params.margin_left,
dpi, kPixelsPerInch);
int margin_bottom_in_pixels = ConvertUnit(
page_params.page_size.height() -
page_params.content_size.height() - page_params.margin_top,
dpi, kPixelsPerInch);
int margin_left_in_pixels = ConvertUnit(
page_params.margin_left,
dpi, kPixelsPerInch);
blink::WebSize original_page_size_in_pixels = page_size_in_pixels;
if (frame) {
frame->pageSizeAndMarginsInPixels(page_index,
page_size_in_pixels,
margin_top_in_pixels,
margin_right_in_pixels,
margin_bottom_in_pixels,
margin_left_in_pixels);
}
int new_content_width = page_size_in_pixels.width -
margin_left_in_pixels - margin_right_in_pixels;
int new_content_height = page_size_in_pixels.height -
margin_top_in_pixels - margin_bottom_in_pixels;
// Invalid page size and/or margins. We just use the default setting.
if (new_content_width < 1 || new_content_height < 1) {
CHECK(frame != NULL);
page_css_params = GetCssPrintParams(NULL, page_index, page_params);
return page_css_params;
}
page_css_params.content_size = gfx::Size(
ConvertUnit(new_content_width, kPixelsPerInch, dpi),
ConvertUnit(new_content_height, kPixelsPerInch, dpi));
if (original_page_size_in_pixels != page_size_in_pixels) {
page_css_params.page_size = gfx::Size(
ConvertUnit(page_size_in_pixels.width, kPixelsPerInch, dpi),
ConvertUnit(page_size_in_pixels.height, kPixelsPerInch, dpi));
} else {
// Printing frame doesn't have any page size css. Pixels to dpi conversion
// causes rounding off errors. Therefore use the default page size values
// directly.
page_css_params.page_size = page_params.page_size;
}
page_css_params.margin_top =
ConvertUnit(margin_top_in_pixels, kPixelsPerInch, dpi);
page_css_params.margin_left =
ConvertUnit(margin_left_in_pixels, kPixelsPerInch, dpi);
return page_css_params;
}
double FitPrintParamsToPage(const PrintMsg_Print_Params& page_params,
PrintMsg_Print_Params* params_to_fit) {
double content_width =
static_cast<double>(params_to_fit->content_size.width());
double content_height =
static_cast<double>(params_to_fit->content_size.height());
int default_page_size_height = page_params.page_size.height();
int default_page_size_width = page_params.page_size.width();
int css_page_size_height = params_to_fit->page_size.height();
int css_page_size_width = params_to_fit->page_size.width();
double scale_factor = 1.0f;
if (page_params.page_size == params_to_fit->page_size)
return scale_factor;
if (default_page_size_width < css_page_size_width ||
default_page_size_height < css_page_size_height) {
double ratio_width =
static_cast<double>(default_page_size_width) / css_page_size_width;
double ratio_height =
static_cast<double>(default_page_size_height) / css_page_size_height;
scale_factor = ratio_width < ratio_height ? ratio_width : ratio_height;
content_width *= scale_factor;
content_height *= scale_factor;
}
params_to_fit->margin_top = static_cast<int>(
(default_page_size_height - css_page_size_height * scale_factor) / 2 +
(params_to_fit->margin_top * scale_factor));
params_to_fit->margin_left = static_cast<int>(
(default_page_size_width - css_page_size_width * scale_factor) / 2 +
(params_to_fit->margin_left * scale_factor));
params_to_fit->content_size = gfx::Size(
static_cast<int>(content_width), static_cast<int>(content_height));
params_to_fit->page_size = page_params.page_size;
return scale_factor;
}
void CalculatePageLayoutFromPrintParams(
const PrintMsg_Print_Params& params,
PageSizeMargins* page_layout_in_points) {
int dpi = GetDPI(&params);
int content_width = params.content_size.width();
int content_height = params.content_size.height();
int margin_bottom = params.page_size.height() -
content_height - params.margin_top;
int margin_right = params.page_size.width() -
content_width - params.margin_left;
page_layout_in_points->content_width =
ConvertUnit(content_width, dpi, kPointsPerInch);
page_layout_in_points->content_height =
ConvertUnit(content_height, dpi, kPointsPerInch);
page_layout_in_points->margin_top =
ConvertUnit(params.margin_top, dpi, kPointsPerInch);
page_layout_in_points->margin_right =
ConvertUnit(margin_right, dpi, kPointsPerInch);
page_layout_in_points->margin_bottom =
ConvertUnit(margin_bottom, dpi, kPointsPerInch);
page_layout_in_points->margin_left =
ConvertUnit(params.margin_left, dpi, kPointsPerInch);
}
void EnsureOrientationMatches(const PrintMsg_Print_Params& css_params,
PrintMsg_Print_Params* page_params) {
if ((page_params->page_size.width() > page_params->page_size.height()) ==
(css_params.page_size.width() > css_params.page_size.height())) {
return;
}
// Swap the |width| and |height| values.
page_params->page_size.SetSize(page_params->page_size.height(),
page_params->page_size.width());
page_params->content_size.SetSize(page_params->content_size.height(),
page_params->content_size.width());
page_params->printable_area.set_size(
gfx::Size(page_params->printable_area.height(),
page_params->printable_area.width()));
}
void ComputeWebKitPrintParamsInDesiredDpi(
const PrintMsg_Print_Params& print_params,
blink::WebPrintParams* webkit_print_params) {
int dpi = GetDPI(&print_params);
webkit_print_params->printerDPI = dpi;
webkit_print_params->printScalingOption = print_params.print_scaling_option;
webkit_print_params->printContentArea.width =
ConvertUnit(print_params.content_size.width(), dpi,
print_params.desired_dpi);
webkit_print_params->printContentArea.height =
ConvertUnit(print_params.content_size.height(), dpi,
print_params.desired_dpi);
webkit_print_params->printableArea.x =
ConvertUnit(print_params.printable_area.x(), dpi,
print_params.desired_dpi);
webkit_print_params->printableArea.y =
ConvertUnit(print_params.printable_area.y(), dpi,
print_params.desired_dpi);
webkit_print_params->printableArea.width =
ConvertUnit(print_params.printable_area.width(), dpi,
print_params.desired_dpi);
webkit_print_params->printableArea.height =
ConvertUnit(print_params.printable_area.height(),
dpi, print_params.desired_dpi);
webkit_print_params->paperSize.width =
ConvertUnit(print_params.page_size.width(), dpi,
print_params.desired_dpi);
webkit_print_params->paperSize.height =
ConvertUnit(print_params.page_size.height(), dpi,
print_params.desired_dpi);
}
blink::WebPlugin* GetPlugin(const blink::WebFrame* frame) {
return frame->document().isPluginDocument() ?
frame->document().to<blink::WebPluginDocument>().plugin() : NULL;
}
bool PrintingNodeOrPdfFrame(const blink::WebFrame* frame,
const blink::WebNode& node) {
if (!node.isNull())
return true;
blink::WebPlugin* plugin = GetPlugin(frame);
return plugin && plugin->supportsPaginatedPrint();
}
MarginType GetMarginsForPdf(blink::WebFrame* frame,
const blink::WebNode& node) {
if (frame->isPrintScalingDisabledForPlugin(node))
return NO_MARGINS;
else
return PRINTABLE_AREA_MARGINS;
}
PrintMsg_Print_Params CalculatePrintParamsForCss(
blink::WebFrame* frame,
int page_index,
const PrintMsg_Print_Params& page_params,
bool ignore_css_margins,
bool fit_to_page,
double* scale_factor) {
PrintMsg_Print_Params css_params = GetCssPrintParams(frame, page_index,
page_params);
PrintMsg_Print_Params params = page_params;
EnsureOrientationMatches(css_params, &params);
if (ignore_css_margins && fit_to_page)
return params;
PrintMsg_Print_Params result_params = css_params;
if (ignore_css_margins) {
result_params.margin_top = params.margin_top;
result_params.margin_left = params.margin_left;
DCHECK(!fit_to_page);
// Since we are ignoring the margins, the css page size is no longer
// valid.
int default_margin_right = params.page_size.width() -
params.content_size.width() - params.margin_left;
int default_margin_bottom = params.page_size.height() -
params.content_size.height() - params.margin_top;
result_params.content_size = gfx::Size(
result_params.page_size.width() - result_params.margin_left -
default_margin_right,
result_params.page_size.height() - result_params.margin_top -
default_margin_bottom);
}
if (fit_to_page) {
double factor = FitPrintParamsToPage(params, &result_params);
if (scale_factor)
*scale_factor = factor;
}
return result_params;
}
} // namespace
FrameReference::FrameReference(blink::WebLocalFrame* frame) {
Reset(frame);
}
FrameReference::FrameReference() {
Reset(NULL);
}
FrameReference::~FrameReference() {
}
void FrameReference::Reset(blink::WebLocalFrame* frame) {
if (frame) {
view_ = frame->view();
frame_ = frame;
} else {
view_ = NULL;
frame_ = NULL;
}
}
blink::WebLocalFrame* FrameReference::GetFrame() {
if (view_ == NULL || frame_ == NULL)
return NULL;
for (blink::WebFrame* frame = view_->mainFrame(); frame != NULL;
frame = frame->traverseNext(false)) {
if (frame == frame_)
return frame_;
}
return NULL;
}
blink::WebView* FrameReference::view() {
return view_;
}
// static - Not anonymous so that platform implementations can use it.
float PrintWebViewHelper::RenderPageContent(blink::WebFrame* frame,
int page_number,
const gfx::Rect& canvas_area,
const gfx::Rect& content_area,
double scale_factor,
blink::WebCanvas* canvas) {
SkAutoCanvasRestore auto_restore(canvas, true);
if (content_area != canvas_area) {
canvas->translate((content_area.x() - canvas_area.x()) / scale_factor,
(content_area.y() - canvas_area.y()) / scale_factor);
SkRect clip_rect(
SkRect::MakeXYWH(content_area.origin().x() / scale_factor,
content_area.origin().y() / scale_factor,
content_area.size().width() / scale_factor,
content_area.size().height() / scale_factor));
SkIRect clip_int_rect;
clip_rect.roundOut(&clip_int_rect);
SkRegion clip_region(clip_int_rect);
canvas->setClipRegion(clip_region);
}
return frame->printPage(page_number, canvas);
}
// Class that calls the Begin and End print functions on the frame and changes
// the size of the view temporarily to support full page printing..
class PrepareFrameAndViewForPrint : public blink::WebViewClient,
public blink::WebFrameClient {
public:
PrepareFrameAndViewForPrint(const PrintMsg_Print_Params& params,
blink::WebLocalFrame* frame,
const blink::WebNode& node,
bool ignore_css_margins);
~PrepareFrameAndViewForPrint() override;
// Optional. Replaces |frame_| with selection if needed. Will call |on_ready|
// when completed.
void CopySelectionIfNeeded(const WebPreferences& preferences,
const base::Closure& on_ready);
// Prepares frame for printing.
void StartPrinting();
blink::WebLocalFrame* frame() {
return frame_.GetFrame();
}
const blink::WebNode& node() const {
return node_to_print_;
}
int GetExpectedPageCount() const {
return expected_pages_count_;
}
void FinishPrinting();
bool IsLoadingSelection() {
// It's not selection if not |owns_web_view_|.
return owns_web_view_ && frame() && frame()->isLoading();
}
protected:
// blink::WebViewClient override:
void didStopLoading() override;
bool allowsBrokenNullLayerTreeView() const override;
// blink::WebFrameClient:
blink::WebFrame* createChildFrame(
blink::WebLocalFrame* parent,
blink::WebTreeScopeType scope,
const blink::WebString& name,
const blink::WebString& unique_name,
blink::WebSandboxFlags sandbox_flags,
const blink::WebFrameOwnerProperties& frame_owner_properties) override;
void frameDetached(blink::WebFrame* frame, DetachType type) override;
private:
void CallOnReady();
void ResizeForPrinting();
void RestoreSize();
void CopySelection(const WebPreferences& preferences);
base::WeakPtrFactory<PrepareFrameAndViewForPrint> weak_ptr_factory_;
FrameReference frame_;
blink::WebNode node_to_print_;
bool owns_web_view_;
blink::WebPrintParams web_print_params_;
gfx::Size prev_view_size_;
gfx::Size prev_scroll_offset_;
int expected_pages_count_;
base::Closure on_ready_;
bool should_print_backgrounds_;
bool should_print_selection_only_;
bool is_printing_started_;
DISALLOW_COPY_AND_ASSIGN(PrepareFrameAndViewForPrint);
};
PrepareFrameAndViewForPrint::PrepareFrameAndViewForPrint(
const PrintMsg_Print_Params& params,
blink::WebLocalFrame* frame,
const blink::WebNode& node,
bool ignore_css_margins)
: weak_ptr_factory_(this),
frame_(frame),
node_to_print_(node),
owns_web_view_(false),
expected_pages_count_(0),
should_print_backgrounds_(params.should_print_backgrounds),
should_print_selection_only_(params.selection_only),
is_printing_started_(false) {
PrintMsg_Print_Params print_params = params;
if (!should_print_selection_only_ ||
!PrintingNodeOrPdfFrame(frame, node_to_print_)) {
bool fit_to_page = ignore_css_margins &&
print_params.print_scaling_option ==
blink::WebPrintScalingOptionFitToPrintableArea;
ComputeWebKitPrintParamsInDesiredDpi(params, &web_print_params_);
frame->printBegin(web_print_params_, node_to_print_);
print_params = CalculatePrintParamsForCss(frame, 0, print_params,
ignore_css_margins, fit_to_page,
NULL);
frame->printEnd();
}
ComputeWebKitPrintParamsInDesiredDpi(print_params, &web_print_params_);
}
PrepareFrameAndViewForPrint::~PrepareFrameAndViewForPrint() {
FinishPrinting();
}
void PrepareFrameAndViewForPrint::ResizeForPrinting() {
// Layout page according to printer page size. Since WebKit shrinks the
// size of the page automatically (from 125% to 200%) we trick it to
// think the page is 125% larger so the size of the page is correct for
// minimum (default) scaling.
// This is important for sites that try to fill the page.
// The 1.25 value is |printingMinimumShrinkFactor|.
gfx::Size print_layout_size(web_print_params_.printContentArea.width,
web_print_params_.printContentArea.height);
print_layout_size.set_height(
static_cast<int>(static_cast<double>(print_layout_size.height()) * 1.25));
if (!frame())
return;
blink::WebView* web_view = frame_.view();
// Backup size and offset.
if (blink::WebFrame* web_frame = web_view->mainFrame())
prev_scroll_offset_ = web_frame->scrollOffset();
prev_view_size_ = web_view->size();
web_view->resize(print_layout_size);
}
void PrepareFrameAndViewForPrint::StartPrinting() {
ResizeForPrinting();
blink::WebView* web_view = frame_.view();
web_view->settings()->setShouldPrintBackgrounds(should_print_backgrounds_);
expected_pages_count_ =
frame()->printBegin(web_print_params_, node_to_print_);
is_printing_started_ = true;
}
void PrepareFrameAndViewForPrint::CopySelectionIfNeeded(
const WebPreferences& preferences,
const base::Closure& on_ready) {
on_ready_ = on_ready;
if (should_print_selection_only_) {
CopySelection(preferences);
} else {
// Call immediately, async call crashes scripting printing.
CallOnReady();
}
}
void PrepareFrameAndViewForPrint::CopySelection(
const WebPreferences& preferences) {
ResizeForPrinting();
std::string url_str = "data:text/html;charset=utf-8,";
url_str.append(
net::EscapeQueryParamValue(frame()->selectionAsMarkup().utf8(), false));
RestoreSize();
// Create a new WebView with the same settings as the current display one.
// Except that we disable javascript (don't want any active content running
// on the page).
WebPreferences prefs = preferences;
prefs.javascript_enabled = false;
blink::WebView* web_view = blink::WebView::create(this);
owns_web_view_ = true;
content::RenderView::ApplyWebPreferences(prefs, web_view);
web_view->setMainFrame(
blink::WebLocalFrame::create(blink::WebTreeScopeType::Document, this));
frame_.Reset(web_view->mainFrame()->toWebLocalFrame());
node_to_print_.reset();
// When loading is done this will call didStopLoading() and that will do the
// actual printing.
frame()->loadRequest(blink::WebURLRequest(GURL(url_str)));
}
bool PrepareFrameAndViewForPrint::allowsBrokenNullLayerTreeView() const {
return true;
}
void PrepareFrameAndViewForPrint::didStopLoading() {
DCHECK(!on_ready_.is_null());
// Don't call callback here, because it can delete |this| and WebView that is
// called didStopLoading.
base::MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(&PrepareFrameAndViewForPrint::CallOnReady,
weak_ptr_factory_.GetWeakPtr()));
}
blink::WebFrame* PrepareFrameAndViewForPrint::createChildFrame(
blink::WebLocalFrame* parent,
blink::WebTreeScopeType scope,
const blink::WebString& name,
const blink::WebString& unique_name,
blink::WebSandboxFlags sandbox_flags,
const blink::WebFrameOwnerProperties& frame_owner_properties) {
blink::WebFrame* frame = blink::WebLocalFrame::create(scope, this);
parent->appendChild(frame);
return frame;
}
void PrepareFrameAndViewForPrint::frameDetached(blink::WebFrame* frame,
DetachType type) {
DCHECK(type == DetachType::Remove);
if (frame->parent())
frame->parent()->removeChild(frame);
frame->close();
}
void PrepareFrameAndViewForPrint::CallOnReady() {
return on_ready_.Run(); // Can delete |this|.
}
void PrepareFrameAndViewForPrint::RestoreSize() {
if (frame()) {
blink::WebView* web_view = frame_.GetFrame()->view();
web_view->resize(prev_view_size_);
if (blink::WebFrame* web_frame = web_view->mainFrame())
web_frame->setScrollOffset(prev_scroll_offset_);
}
}
void PrepareFrameAndViewForPrint::FinishPrinting() {
blink::WebLocalFrame* frame = frame_.GetFrame();
if (frame) {
blink::WebView* web_view = frame->view();
if (is_printing_started_) {
is_printing_started_ = false;
frame->printEnd();
if (!owns_web_view_) {
web_view->settings()->setShouldPrintBackgrounds(false);
RestoreSize();
}
}
if (owns_web_view_) {
DCHECK(!frame->isLoading());
owns_web_view_ = false;
web_view->close();
}
}
frame_.Reset(NULL);
on_ready_.Reset();
}
PrintWebViewHelper::PrintWebViewHelper(content::RenderView* render_view)
: content::RenderViewObserver(render_view),
content::RenderViewObserverTracker<PrintWebViewHelper>(render_view),
reset_prep_frame_view_(false),
is_print_ready_metafile_sent_(false),
ignore_css_margins_(false),
is_scripted_printing_blocked_(false),
notify_browser_of_print_failure_(true),
print_for_preview_(false),
print_node_in_progress_(false),
is_loading_(false),
is_scripted_preview_delayed_(false),
weak_ptr_factory_(this) {
}
PrintWebViewHelper::~PrintWebViewHelper() {}
// Prints |frame| which called window.print().
void PrintWebViewHelper::PrintPage(blink::WebLocalFrame* frame,
bool user_initiated) {
DCHECK(frame);
Print(frame, blink::WebNode());
}
bool PrintWebViewHelper::OnMessageReceived(const IPC::Message& message) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(PrintWebViewHelper, message)
IPC_MESSAGE_HANDLER(PrintMsg_PrintPages, OnPrintPages)
IPC_MESSAGE_HANDLER(PrintMsg_PrintingDone, OnPrintingDone)
IPC_MESSAGE_HANDLER(PrintMsg_PrintPreview, OnPrintPreview)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
bool PrintWebViewHelper::GetPrintFrame(blink::WebLocalFrame** frame) {
DCHECK(frame);
blink::WebView* webView = render_view()->GetWebView();
DCHECK(webView);
if (!webView)
return false;
// If the user has selected text in the currently focused frame we print
// only that frame (this makes print selection work for multiple frames).
blink::WebLocalFrame* focusedFrame =
webView->focusedFrame()->toWebLocalFrame();
*frame = focusedFrame->hasSelection()
? focusedFrame
: webView->mainFrame()->toWebLocalFrame();
return true;
}
#if !defined(DISABLE_BASIC_PRINTING)
void PrintWebViewHelper::OnPrintPages(bool silent, bool print_background) {
blink::WebLocalFrame* frame;
if (GetPrintFrame(&frame))
Print(frame, blink::WebNode(), silent, print_background);
}
#endif // !DISABLE_BASIC_PRINTING
void PrintWebViewHelper::GetPageSizeAndContentAreaFromPageLayout(
const PageSizeMargins& page_layout_in_points,
gfx::Size* page_size,
gfx::Rect* content_area) {
*page_size = gfx::Size(
page_layout_in_points.content_width +
page_layout_in_points.margin_right +
page_layout_in_points.margin_left,
page_layout_in_points.content_height +
page_layout_in_points.margin_top +
page_layout_in_points.margin_bottom);
*content_area = gfx::Rect(page_layout_in_points.margin_left,
page_layout_in_points.margin_top,
page_layout_in_points.content_width,
page_layout_in_points.content_height);
}
void PrintWebViewHelper::UpdateFrameMarginsCssInfo(
const base::DictionaryValue& settings) {
int margins_type = 0;
if (!settings.GetInteger(kSettingMarginsType, &margins_type))
margins_type = DEFAULT_MARGINS;
ignore_css_margins_ = (margins_type != DEFAULT_MARGINS);
}
void PrintWebViewHelper::OnPrintingDone(bool success) {
notify_browser_of_print_failure_ = false;
if (!success)
LOG(ERROR) << "Failure in OnPrintingDone";
DidFinishPrinting(success ? OK : FAIL_PRINT);
}
void PrintWebViewHelper::OnPrintPreview(const base::DictionaryValue& settings) {
blink::WebLocalFrame* frame;
if (GetPrintFrame(&frame)) {
print_preview_context_.InitWithFrame(frame);
if (!print_preview_context_.source_frame()) {
DidFinishPrinting(FAIL_PREVIEW);
return;
}
if (!UpdatePrintSettings(print_preview_context_.source_frame(),
print_preview_context_.source_node(), settings)) {
DidFinishPrinting(FAIL_PREVIEW);
return;
}
is_print_ready_metafile_sent_ = false;
PrepareFrameForPreviewDocument();
}
}
void PrintWebViewHelper::PrepareFrameForPreviewDocument() {
reset_prep_frame_view_ = false;
if (!print_pages_params_) {
DidFinishPrinting(FAIL_PREVIEW);
return;
}
// Don't reset loading frame or WebKit will fail assert. Just retry when
// current selection is loaded.
if (prep_frame_view_ && prep_frame_view_->IsLoadingSelection()) {
reset_prep_frame_view_ = true;
return;
}
const PrintMsg_Print_Params& print_params = print_pages_params_->params;
prep_frame_view_.reset(new PrepareFrameAndViewForPrint(
print_params, print_preview_context_.source_frame(),
print_preview_context_.source_node(), ignore_css_margins_));
prep_frame_view_->CopySelectionIfNeeded(
render_view()->GetWebkitPreferences(),
base::Bind(&PrintWebViewHelper::OnFramePreparedForPreviewDocument,
base::Unretained(this)));
}
void PrintWebViewHelper::OnFramePreparedForPreviewDocument() {
if (reset_prep_frame_view_) {
PrepareFrameForPreviewDocument();
return;
}
DidFinishPrinting(CreatePreviewDocument() ? OK : FAIL_PREVIEW);
}
bool PrintWebViewHelper::CreatePreviewDocument() {
if (!print_pages_params_)
return false;
const PrintMsg_Print_Params& print_params = print_pages_params_->params;
const std::vector<int>& pages = print_pages_params_->pages;
if (!print_preview_context_.CreatePreviewDocument(prep_frame_view_.release(),
pages)) {
return false;
}
while (!print_preview_context_.IsFinalPageRendered()) {
int page_number = print_preview_context_.GetNextPageNumber();
DCHECK_GE(page_number, 0);
if (!RenderPreviewPage(page_number, print_params))
return false;
// We must call PrepareFrameAndViewForPrint::FinishPrinting() (by way of
// print_preview_context_.AllPagesRendered()) before calling
// FinalizePrintReadyDocument() when printing a PDF because the plugin
// code does not generate output until we call FinishPrinting(). We do not
// generate draft pages for PDFs, so IsFinalPageRendered() and
// IsLastPageOfPrintReadyMetafile() will be true in the same iteration of
// the loop.
if (print_preview_context_.IsFinalPageRendered())
print_preview_context_.AllPagesRendered();
if (print_preview_context_.IsLastPageOfPrintReadyMetafile()) {
DCHECK(print_preview_context_.IsModifiable() ||
print_preview_context_.IsFinalPageRendered());
if (!FinalizePrintReadyDocument())
return false;
}
}
print_preview_context_.Finished();
return true;
}
bool PrintWebViewHelper::FinalizePrintReadyDocument() {
DCHECK(!is_print_ready_metafile_sent_);
print_preview_context_.FinalizePrintReadyDocument();
PdfMetafileSkia* metafile = print_preview_context_.metafile();
PrintHostMsg_DidPreviewDocument_Params preview_params;
// Ask the browser to create the shared memory for us.
if (!CopyMetafileDataToSharedMem(*metafile,
&(preview_params.metafile_data_handle))) {
LOG(ERROR) << "CopyMetafileDataToSharedMem failed";
print_preview_context_.set_error(PREVIEW_ERROR_METAFILE_COPY_FAILED);
return false;
}
preview_params.data_size = metafile->GetDataSize();
preview_params.document_cookie = print_pages_params_->params.document_cookie;
preview_params.expected_pages_count =
print_preview_context_.total_page_count();
preview_params.modifiable = print_preview_context_.IsModifiable();
preview_params.preview_request_id =
print_pages_params_->params.preview_request_id;
is_print_ready_metafile_sent_ = true;
Send(new PrintHostMsg_MetafileReadyForPrinting(routing_id(), preview_params));
return true;
}
void PrintWebViewHelper::PrintNode(const blink::WebNode& node) {
if (node.isNull() || !node.document().frame()) {
// This can occur when the context menu refers to an invalid WebNode.
// See http://crbug.com/100890#c17 for a repro case.
return;
}
if (print_node_in_progress_) {
// This can happen as a result of processing sync messages when printing
// from ppapi plugins. It's a rare case, so its OK to just fail here.
// See http://crbug.com/159165.
return;
}
print_node_in_progress_ = true;
blink::WebNode duplicate_node(node);
Print(duplicate_node.document().frame(), duplicate_node);
print_node_in_progress_ = false;
}
void PrintWebViewHelper::Print(blink::WebLocalFrame* frame,
const blink::WebNode& node,
bool silent,
bool print_background) {
// If still not finished with earlier print request simply ignore.
if (prep_frame_view_)
return;
FrameReference frame_ref(frame);
int expected_page_count = 0;
if (!CalculateNumberOfPages(frame, node, &expected_page_count)) {
DidFinishPrinting(FAIL_PRINT_INIT);
return; // Failed to init print page settings.
}
// Some full screen plugins can say they don't want to print.
if (!expected_page_count) {
DidFinishPrinting(FAIL_PRINT);
return;
}
// Ask the browser to show UI to retrieve the final print settings.
if (!silent && !GetPrintSettingsFromUser(frame_ref.GetFrame(), node,
expected_page_count)) {
DidFinishPrinting(OK); // Release resources and fail silently.
return;
}
print_pages_params_->params.should_print_backgrounds = print_background;
// Render Pages for printing.
if (!RenderPagesForPrint(frame_ref.GetFrame(), node)) {
LOG(ERROR) << "RenderPagesForPrint failed";
DidFinishPrinting(FAIL_PRINT);
}
}
void PrintWebViewHelper::DidFinishPrinting(PrintingResult result) {
switch (result) {
case OK:
break;
case FAIL_PRINT_INIT:
DCHECK(!notify_browser_of_print_failure_);
break;
case FAIL_PRINT:
if (notify_browser_of_print_failure_ && print_pages_params_) {
int cookie = print_pages_params_->params.document_cookie;
Send(new PrintHostMsg_PrintingFailed(routing_id(), cookie));
}
break;
case FAIL_PREVIEW:
LOG(ERROR) << "PREVIEW FAILED.";
if (print_pages_params_) {
Send(new PrintHostMsg_PrintPreviewFailed(routing_id(),
print_pages_params_->params.document_cookie,
print_pages_params_->params.preview_request_id));
}
break;
}
prep_frame_view_.reset();
print_pages_params_.reset();
notify_browser_of_print_failure_ = true;
}
void PrintWebViewHelper::OnFramePreparedForPrintPages() {
PrintPages();
FinishFramePrinting();
}
void PrintWebViewHelper::PrintPages() {
if (!prep_frame_view_) // Printing is already canceled or failed.
return;
prep_frame_view_->StartPrinting();
int page_count = prep_frame_view_->GetExpectedPageCount();
if (!page_count) {
LOG(ERROR) << "Can't print 0 pages.";
return DidFinishPrinting(FAIL_PRINT);
}
const PrintMsg_PrintPages_Params& params = *print_pages_params_;
const PrintMsg_Print_Params& print_params = params.params;
#if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
// TODO(vitalybuka): should be page_count or valid pages from params.pages.
// See http://crbug.com/161576
Send(new PrintHostMsg_DidGetPrintedPagesCount(routing_id(),
print_params.document_cookie,
page_count));
#endif // !defined(OS_CHROMEOS)
if (!PrintPagesNative(prep_frame_view_->frame(), page_count)) {
LOG(ERROR) << "Printing failed.";
return DidFinishPrinting(FAIL_PRINT);
}
}
void PrintWebViewHelper::FinishFramePrinting() {
prep_frame_view_.reset();
}
#if defined(OS_MACOSX)
bool PrintWebViewHelper::PrintPagesNative(blink::WebFrame* frame,
int page_count) {
const PrintMsg_PrintPages_Params& params = *print_pages_params_;
const PrintMsg_Print_Params& print_params = params.params;
PrintMsg_PrintPage_Params page_params;
page_params.params = print_params;
if (params.pages.empty()) {
for (int i = 0; i < page_count; ++i) {
page_params.page_number = i;
PrintPageInternal(page_params, frame);
}
} else {
for (size_t i = 0; i < params.pages.size(); ++i) {
if (params.pages[i] >= page_count)
break;
page_params.page_number = params.pages[i];
PrintPageInternal(page_params, frame);
}
}
return true;
}
#endif // OS_MACOSX
// static - Not anonymous so that platform implementations can use it.
void PrintWebViewHelper::ComputePageLayoutInPointsForCss(
blink::WebFrame* frame,
int page_index,
const PrintMsg_Print_Params& page_params,
bool ignore_css_margins,
double* scale_factor,
PageSizeMargins* page_layout_in_points) {
PrintMsg_Print_Params params = CalculatePrintParamsForCss(
frame, page_index, page_params, ignore_css_margins,
page_params.print_scaling_option ==
blink::WebPrintScalingOptionFitToPrintableArea,
scale_factor);
CalculatePageLayoutFromPrintParams(params, page_layout_in_points);
}
bool PrintWebViewHelper::InitPrintSettings(bool fit_to_paper_size) {
PrintMsg_PrintPages_Params settings;
Send(new PrintHostMsg_GetDefaultPrintSettings(routing_id(),
&settings.params));
// Check if the printer returned any settings, if the settings is empty, we
// can safely assume there are no printer drivers configured. So we safely
// terminate.
bool result = true;
if (!PrintMsg_Print_Params_IsValid(settings.params))
result = false;
// Reset to default values.
ignore_css_margins_ = false;
settings.pages.clear();
settings.params.print_scaling_option =
blink::WebPrintScalingOptionSourceSize;
if (fit_to_paper_size) {
settings.params.print_scaling_option =
blink::WebPrintScalingOptionFitToPrintableArea;
}
SetPrintPagesParams(settings);
return result;
}
bool PrintWebViewHelper::CalculateNumberOfPages(blink::WebLocalFrame* frame,
const blink::WebNode& node,
int* number_of_pages) {
DCHECK(frame);
bool fit_to_paper_size = !(PrintingNodeOrPdfFrame(frame, node));
if (!InitPrintSettings(fit_to_paper_size)) {
notify_browser_of_print_failure_ = false;
Send(new PrintHostMsg_ShowInvalidPrinterSettingsError(routing_id()));
return false;
}
const PrintMsg_Print_Params& params = print_pages_params_->params;
PrepareFrameAndViewForPrint prepare(params, frame, node, ignore_css_margins_);
prepare.StartPrinting();
*number_of_pages = prepare.GetExpectedPageCount();
return true;
}
bool PrintWebViewHelper::UpdatePrintSettings(
blink::WebLocalFrame* frame,
const blink::WebNode& node,
const base::DictionaryValue& passed_job_settings) {
const base::DictionaryValue* job_settings = &passed_job_settings;
base::DictionaryValue modified_job_settings;
if (job_settings->empty()) {
if (!print_for_preview_)
print_preview_context_.set_error(PREVIEW_ERROR_BAD_SETTING);
return false;
}
bool source_is_html = true;
if (print_for_preview_) {
if (!job_settings->GetBoolean(kSettingPreviewModifiable, &source_is_html)) {
NOTREACHED();
}
} else {
source_is_html = !PrintingNodeOrPdfFrame(frame, node);
}
if (print_for_preview_ || !source_is_html) {
modified_job_settings.MergeDictionary(job_settings);
modified_job_settings.SetBoolean(kSettingHeaderFooterEnabled, false);
modified_job_settings.SetInteger(kSettingMarginsType, NO_MARGINS);
job_settings = &modified_job_settings;
}
// Send the cookie so that UpdatePrintSettings can reuse PrinterQuery when
// possible.
int cookie =
print_pages_params_ ? print_pages_params_->params.document_cookie : 0;
PrintMsg_PrintPages_Params settings;
bool canceled = false;
Send(new PrintHostMsg_UpdatePrintSettings(routing_id(), cookie, *job_settings,
&settings, &canceled));
if (canceled) {
notify_browser_of_print_failure_ = false;
return false;
}
if (!print_for_preview_) {
job_settings->GetInteger(kPreviewRequestID,
&settings.params.preview_request_id);
settings.params.print_to_pdf = true;
UpdateFrameMarginsCssInfo(*job_settings);
settings.params.print_scaling_option =
blink::WebPrintScalingOptionSourceSize;
}
SetPrintPagesParams(settings);
if (!PrintMsg_Print_Params_IsValid(settings.params)) {
if (!print_for_preview_)
print_preview_context_.set_error(PREVIEW_ERROR_INVALID_PRINTER_SETTINGS);
return false;
}
return true;
}
bool PrintWebViewHelper::GetPrintSettingsFromUser(blink::WebFrame* frame,
const blink::WebNode& node,
int expected_pages_count) {
PrintHostMsg_ScriptedPrint_Params params;
PrintMsg_PrintPages_Params print_settings;
params.cookie = print_pages_params_->params.document_cookie;
params.has_selection = frame->hasSelection();
params.expected_pages_count = expected_pages_count;
MarginType margin_type = DEFAULT_MARGINS;
if (PrintingNodeOrPdfFrame(frame, node))
margin_type = GetMarginsForPdf(frame, node);
params.margin_type = margin_type;
// PrintHostMsg_ScriptedPrint will reset print_scaling_option, so we save the
// value before and restore it afterwards.
blink::WebPrintScalingOption scaling_option =
print_pages_params_->params.print_scaling_option;
print_pages_params_.reset();
IPC::SyncMessage* msg =
new PrintHostMsg_ScriptedPrint(routing_id(), params, &print_settings);
msg->EnableMessagePumping();
Send(msg);
print_settings.params.print_scaling_option = scaling_option;
SetPrintPagesParams(print_settings);
return (print_settings.params.dpi && print_settings.params.document_cookie);
}
bool PrintWebViewHelper::RenderPagesForPrint(blink::WebLocalFrame* frame,
const blink::WebNode& node) {
if (!frame || prep_frame_view_)
return false;
const PrintMsg_PrintPages_Params& params = *print_pages_params_;
const PrintMsg_Print_Params& print_params = params.params;
prep_frame_view_.reset(new PrepareFrameAndViewForPrint(
print_params, frame, node, ignore_css_margins_));
DCHECK(!print_pages_params_->params.selection_only ||
print_pages_params_->pages.empty());
prep_frame_view_->CopySelectionIfNeeded(
render_view()->GetWebkitPreferences(),
base::Bind(&PrintWebViewHelper::OnFramePreparedForPrintPages,
base::Unretained(this)));
return true;
}
#if defined(OS_POSIX)
bool PrintWebViewHelper::CopyMetafileDataToSharedMem(
const PdfMetafileSkia& metafile,
base::SharedMemoryHandle* shared_mem_handle) {
uint32_t buf_size = metafile.GetDataSize();
if (buf_size == 0)
return false;
std::unique_ptr<base::SharedMemory> shared_buf(
content::RenderThread::Get()->HostAllocateSharedMemoryBuffer(buf_size));
if (!shared_buf)
return false;
if (!shared_buf->Map(buf_size))
return false;
if (!metafile.GetData(shared_buf->memory(), buf_size))
return false;
return shared_buf->GiveToProcess(base::GetCurrentProcessHandle(),
shared_mem_handle);
}
#endif // defined(OS_POSIX)
void PrintWebViewHelper::SetPrintPagesParams(
const PrintMsg_PrintPages_Params& settings) {
print_pages_params_.reset(new PrintMsg_PrintPages_Params(settings));
}
bool PrintWebViewHelper::PreviewPageRendered(int page_number,
PdfMetafileSkia* metafile) {
DCHECK_GE(page_number, FIRST_PAGE_INDEX);
// For non-modifiable files, |metafile| should be NULL, so do not bother
// sending a message. If we don't generate draft metafiles, |metafile| is
// NULL.
if (!print_preview_context_.IsModifiable() ||
!print_preview_context_.generate_draft_pages()) {
DCHECK(!metafile);
return true;
}
if (!metafile) {
NOTREACHED();
print_preview_context_.set_error(
PREVIEW_ERROR_PAGE_RENDERED_WITHOUT_METAFILE);
return false;
}
return true;
}
PrintWebViewHelper::PrintPreviewContext::PrintPreviewContext()
: total_page_count_(0),
current_page_index_(0),
generate_draft_pages_(true),
print_ready_metafile_page_count_(0),
error_(PREVIEW_ERROR_NONE),
state_(UNINITIALIZED) {
}
PrintWebViewHelper::PrintPreviewContext::~PrintPreviewContext() {
}
void PrintWebViewHelper::PrintPreviewContext::InitWithFrame(
blink::WebLocalFrame* web_frame) {
DCHECK(web_frame);
DCHECK(!IsRendering());
state_ = INITIALIZED;
source_frame_.Reset(web_frame);
source_node_.reset();
}
void PrintWebViewHelper::PrintPreviewContext::InitWithNode(
const blink::WebNode& web_node) {
DCHECK(!web_node.isNull());
DCHECK(web_node.document().frame());
DCHECK(!IsRendering());
state_ = INITIALIZED;
source_frame_.Reset(web_node.document().frame());
source_node_ = web_node;
}
void PrintWebViewHelper::PrintPreviewContext::OnPrintPreview() {
DCHECK_EQ(INITIALIZED, state_);
ClearContext();
}
bool PrintWebViewHelper::PrintPreviewContext::CreatePreviewDocument(
PrepareFrameAndViewForPrint* prepared_frame,
const std::vector<int>& pages) {
DCHECK_EQ(INITIALIZED, state_);
state_ = RENDERING;
// Need to make sure old object gets destroyed first.
prep_frame_view_.reset(prepared_frame);
prep_frame_view_->StartPrinting();
total_page_count_ = prep_frame_view_->GetExpectedPageCount();
if (total_page_count_ == 0) {
LOG(ERROR) << "CreatePreviewDocument got 0 page count";
set_error(PREVIEW_ERROR_ZERO_PAGES);
return false;
}
metafile_.reset(new PdfMetafileSkia);
CHECK(metafile_->Init());
current_page_index_ = 0;
pages_to_render_ = pages;
// Sort and make unique.
std::sort(pages_to_render_.begin(), pages_to_render_.end());
pages_to_render_.resize(
std::unique(pages_to_render_.begin(), pages_to_render_.end()) -
pages_to_render_.begin());
// Remove invalid pages.
pages_to_render_.resize(std::lower_bound(pages_to_render_.begin(),
pages_to_render_.end(),
total_page_count_) -
pages_to_render_.begin());
print_ready_metafile_page_count_ = pages_to_render_.size();
if (pages_to_render_.empty()) {
print_ready_metafile_page_count_ = total_page_count_;
// Render all pages.
for (int i = 0; i < total_page_count_; ++i)
pages_to_render_.push_back(i);
} else if (generate_draft_pages_) {
int pages_index = 0;
for (int i = 0; i < total_page_count_; ++i) {
if (pages_index < print_ready_metafile_page_count_ &&
i == pages_to_render_[pages_index]) {
pages_index++;
continue;
}
pages_to_render_.push_back(i);
}
}
document_render_time_ = base::TimeDelta();
begin_time_ = base::TimeTicks::Now();
return true;
}
void PrintWebViewHelper::PrintPreviewContext::RenderedPreviewPage(
const base::TimeDelta& page_time) {
DCHECK_EQ(RENDERING, state_);
document_render_time_ += page_time;
UMA_HISTOGRAM_TIMES("PrintPreview.RenderPDFPageTime", page_time);
}
void PrintWebViewHelper::PrintPreviewContext::AllPagesRendered() {
DCHECK_EQ(RENDERING, state_);
state_ = DONE;
prep_frame_view_->FinishPrinting();
}
void PrintWebViewHelper::PrintPreviewContext::FinalizePrintReadyDocument() {
DCHECK(IsRendering());
base::TimeTicks begin_time = base::TimeTicks::Now();
metafile_->FinishDocument();
if (print_ready_metafile_page_count_ <= 0) {
NOTREACHED();
return;
}
UMA_HISTOGRAM_MEDIUM_TIMES("PrintPreview.RenderToPDFTime",
document_render_time_);
base::TimeDelta total_time =
(base::TimeTicks::Now() - begin_time) + document_render_time_;
UMA_HISTOGRAM_MEDIUM_TIMES("PrintPreview.RenderAndGeneratePDFTime",
total_time);
UMA_HISTOGRAM_MEDIUM_TIMES("PrintPreview.RenderAndGeneratePDFTimeAvgPerPage",
total_time / pages_to_render_.size());
}
void PrintWebViewHelper::PrintPreviewContext::Finished() {
DCHECK_EQ(DONE, state_);
state_ = INITIALIZED;
ClearContext();
}
void PrintWebViewHelper::PrintPreviewContext::Failed(bool report_error) {
DCHECK(state_ == INITIALIZED || state_ == RENDERING);
state_ = INITIALIZED;
if (report_error) {
DCHECK_NE(PREVIEW_ERROR_NONE, error_);
UMA_HISTOGRAM_ENUMERATION("PrintPreview.RendererError", error_,
PREVIEW_ERROR_LAST_ENUM);
}
ClearContext();
}
int PrintWebViewHelper::PrintPreviewContext::GetNextPageNumber() {
DCHECK_EQ(RENDERING, state_);
if (IsFinalPageRendered())
return -1;
return pages_to_render_[current_page_index_++];
}
bool PrintWebViewHelper::PrintPreviewContext::IsRendering() const {
return state_ == RENDERING || state_ == DONE;
}
bool PrintWebViewHelper::PrintPreviewContext::IsModifiable() {
// The only kind of node we can print right now is a PDF node.
return !PrintingNodeOrPdfFrame(source_frame(), source_node_);
}
bool PrintWebViewHelper::PrintPreviewContext::HasSelection() {
return IsModifiable() && source_frame()->hasSelection();
}
bool PrintWebViewHelper::PrintPreviewContext::IsLastPageOfPrintReadyMetafile()
const {
DCHECK(IsRendering());
return current_page_index_ == print_ready_metafile_page_count_;
}
bool PrintWebViewHelper::PrintPreviewContext::IsFinalPageRendered() const {
DCHECK(IsRendering());
return static_cast<size_t>(current_page_index_) == pages_to_render_.size();
}
void PrintWebViewHelper::PrintPreviewContext::set_generate_draft_pages(
bool generate_draft_pages) {
DCHECK_EQ(INITIALIZED, state_);
generate_draft_pages_ = generate_draft_pages;
}
void PrintWebViewHelper::PrintPreviewContext::set_error(
enum PrintPreviewErrorBuckets error) {
error_ = error;
}
blink::WebLocalFrame* PrintWebViewHelper::PrintPreviewContext::source_frame() {
DCHECK(state_ != UNINITIALIZED);
return source_frame_.GetFrame();
}
const blink::WebNode&
PrintWebViewHelper::PrintPreviewContext::source_node() const {
DCHECK(state_ != UNINITIALIZED);
return source_node_;
}
blink::WebLocalFrame*
PrintWebViewHelper::PrintPreviewContext::prepared_frame() {
DCHECK(state_ != UNINITIALIZED);
return prep_frame_view_->frame();
}
const blink::WebNode&
PrintWebViewHelper::PrintPreviewContext::prepared_node() const {
DCHECK(state_ != UNINITIALIZED);
return prep_frame_view_->node();
}
int PrintWebViewHelper::PrintPreviewContext::total_page_count() const {
DCHECK(state_ != UNINITIALIZED);
return total_page_count_;
}
bool PrintWebViewHelper::PrintPreviewContext::generate_draft_pages() const {
return generate_draft_pages_;
}
PdfMetafileSkia* PrintWebViewHelper::PrintPreviewContext::metafile() {
DCHECK(IsRendering());
return metafile_.get();
}
int PrintWebViewHelper::PrintPreviewContext::last_error() const {
return error_;
}
void PrintWebViewHelper::PrintPreviewContext::ClearContext() {
prep_frame_view_.reset();
metafile_.reset();
pages_to_render_.clear();
error_ = PREVIEW_ERROR_NONE;
}
} // namespace printing
Reference in New Issue View Git Blame Copy Permalink