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// Copyright (c) 2009 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/print_web_view_helper.h"
#import <AppKit/AppKit.h>
#include "app/l10n_util.h"
#include "base/logging.h"
#include "base/process_util.h"
#include "base/scoped_cftyperef.h"
#include "chrome/common/render_messages.h"
#include "chrome/renderer/render_view.h"
#include "grit/generated_resources.h"
#include "printing/native_metafile.h"
#include "third_party/WebKit/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/WebKit/chromium/public/WebCanvas.h"
#include "third_party/WebKit/WebKit/chromium/public/WebConsoleMessage.h"
using WebKit::WebFrame;
using WebKit::WebCanvas;
using WebKit::WebConsoleMessage;
using WebKit::WebString;
// TODO(stuartmorgan): There's a fair amount of code here that is duplicated
// from _win that should instead be shared. Once Linux has a real print settings
// implementation, it's likely that this whole method can just be moved to the
// cross-platform file, and the slight divergences resolved/ifdef'd.
void PrintWebViewHelper::Print(WebFrame* frame, bool script_initiated) {
const int kMinSecondsToIgnoreJavascriptInitiatedPrint = 2;
const int kMaxSecondsToIgnoreJavascriptInitiatedPrint = 2 * 60; // 2 Minutes.
// If still not finished with earlier print request simply ignore.
if (IsPrinting())
return;
// TODO(maruel): Move this out of platform specific code.
// Check if there is script repeatedly trying to print and ignore it if too
// frequent. We use exponential wait time so for a page that calls print() in
// a loop the user will need to cancel the print dialog after 2 seconds, 4
// seconds, 8, ... up to the maximum of 2 minutes.
// This gives the user time to navigate from the page.
if (script_initiated && (user_cancelled_scripted_print_count_ > 0)) {
base::TimeDelta diff = base::Time::Now() - last_cancelled_script_print_;
int min_wait_seconds = std::min(
kMinSecondsToIgnoreJavascriptInitiatedPrint <<
(user_cancelled_scripted_print_count_ - 1),
kMaxSecondsToIgnoreJavascriptInitiatedPrint);
if (diff.InSeconds() < min_wait_seconds) {
WebString message(WebString::fromUTF8(
"Ignoring too frequent calls to print()."));
frame->addMessageToConsole(WebConsoleMessage(
WebConsoleMessage::LevelWarning,
message));
return;
}
}
// Retrieve the default print settings to calculate the expected number of
// pages.
ViewMsg_Print_Params default_settings;
bool user_cancelled_print = false;
IPC::SyncMessage* msg =
new ViewHostMsg_GetDefaultPrintSettings(routing_id(), &default_settings);
if (Send(msg)) {
msg = NULL;
if (default_settings.IsEmpty()) {
NOTREACHED() << "Couldn't get default print settings";
return;
}
// Continue only if the settings are valid.
if (default_settings.dpi && default_settings.document_cookie) {
int expected_pages_count = 0;
// Prepare once to calculate the estimated page count. This must be in
// a scope for itself (see comments on PrepareFrameAndViewForPrint).
{
PrepareFrameAndViewForPrint prep_frame_view(default_settings,
frame,
frame->view());
expected_pages_count = prep_frame_view.GetExpectedPageCount();
DCHECK(expected_pages_count);
}
// Ask the browser to show UI to retrieve the final print settings.
ViewMsg_PrintPages_Params print_settings;
ViewHostMsg_ScriptedPrint_Params params;
// The routing id is sent across as it is needed to look up the
// corresponding RenderViewHost instance to signal and reset the
// pump messages event.
params.routing_id = routing_id();
// host_window_ may be NULL at this point if the current window is a popup
// and the print() command has been issued from the parent. The receiver
// of this message has to deal with this.
params.host_window_id = render_view_->host_window();
params.cookie = default_settings.document_cookie;
params.has_selection = frame->hasSelection();
params.expected_pages_count = expected_pages_count;
msg = new ViewHostMsg_ScriptedPrint(routing_id(), params,
&print_settings);
msg->EnableMessagePumping();
if (Send(msg)) {
msg = NULL;
// If the settings are invalid, early quit.
if (print_settings.params.dpi &&
print_settings.params.document_cookie) {
if (print_settings.params.selection_only) {
CopyAndPrint(print_settings, frame);
} else {
// TODO: Always copy before printing.
PrintPages(print_settings, frame);
}
// Reset cancel counter on first successful print.
user_cancelled_scripted_print_count_ = 0;
return; // All went well.
} else {
user_cancelled_print = true;
}
} else {
// Send() failed.
NOTREACHED();
}
} else {
// Failed to get default settings.
NOTREACHED();
}
} else {
// Send() failed.
NOTREACHED();
}
if (script_initiated && user_cancelled_print) {
++user_cancelled_scripted_print_count_;
last_cancelled_script_print_ = base::Time::Now();
}
// When |user_cancelled_print| is true, we treat it as success so that
// DidFinishPrinting() won't show any error alert.
// If |user_cancelled_print| is false and we reach here, there must be
// something wrong and hence is not success, DidFinishPrinting() should show
// an error alert.
// In both cases, we have to call DidFinishPrinting() here to release
// printing resources, since we don't need them anymore.
DidFinishPrinting(user_cancelled_print);
}
void PrintWebViewHelper::PrintPages(const ViewMsg_PrintPages_Params& params,
WebKit::WebFrame* frame) {
PrepareFrameAndViewForPrint prep_frame_view(params.params,
frame,
frame->view());
int page_count = prep_frame_view.GetExpectedPageCount();
Send(new ViewHostMsg_DidGetPrintedPagesCount(routing_id(),
params.params.document_cookie,
page_count));
if (!page_count)
return;
const gfx::Size& canvas_size = prep_frame_view.GetPrintCanvasSize();
ViewMsg_PrintPage_Params page_params;
page_params.params = params.params;
if (params.pages.empty()) {
for (int i = 0; i < page_count; ++i) {
page_params.page_number = i;
PrintPage(page_params, canvas_size, 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];
PrintPage(page_params, canvas_size, frame);
}
}
}
void PrintWebViewHelper::PrintPage(const ViewMsg_PrintPage_Params& params,
const gfx::Size& canvas_size,
WebFrame* frame) {
printing::NativeMetafile metafile;
CGContextRef context = metafile.Init();
float scale_factor = frame->getPrintPageShrink(params.page_number);
metafile.StartPage(canvas_size.width(), canvas_size.height(), scale_factor);
// printPage can create autoreleased references to |canvas|. PDF contexts
// don't write all their data until they are destroyed, so we need to make
// certain that there are no lingering references.
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
frame->printPage(params.page_number, context);
[pool release];
metafile.FinishPage();
metafile.Close();
// Get the size of the compiled metafile.
ViewHostMsg_DidPrintPage_Params page_params;
page_params.data_size = 0;
page_params.page_number = params.page_number;
page_params.document_cookie = params.params.document_cookie;
page_params.actual_shrink = scale_factor;
base::SharedMemory shared_buf;
// Ask the browser to create the shared memory for us.
uint32 buf_size = metafile.GetDataSize();
base::SharedMemoryHandle shared_mem_handle;
if (Send(new ViewHostMsg_AllocatePDFTransport(routing_id(), buf_size,
&shared_mem_handle))) {
if (base::SharedMemory::IsHandleValid(shared_mem_handle)) {
base::SharedMemory shared_buf(shared_mem_handle, false);
if (shared_buf.Map(buf_size)) {
metafile.GetData(shared_buf.memory(), buf_size);
page_params.data_size = buf_size;
shared_buf.GiveToProcess(base::GetCurrentProcessHandle(),
&(page_params.metafile_data_handle));
} else {
NOTREACHED() << "Map failed";
}
} else {
NOTREACHED() << "Browser failed to allocate shared memory";
}
} else {
NOTREACHED() << "Browser allocation request message failed";
}
Send(new ViewHostMsg_DidPrintPage(routing_id(), page_params));
}
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