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// 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.
#ifndef CHROME_BROWSER_PRINTING_PRINTER_QUERY_H_
#define CHROME_BROWSER_PRINTING_PRINTER_QUERY_H_
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "chrome/browser/printing/print_job_worker_owner.h"
#include "printing/print_job_constants.h"
#include "ui/gfx/native_widget_types.h"
namespace base {
class DictionaryValue;
class MessageLoop;
}
namespace printing {
class PrintDestinationInterface;
class PrintJobWorker;
// Query the printer for settings.
class PrinterQuery : public PrintJobWorkerOwner {
public:
// GetSettings() UI parameter.
enum GetSettingsAskParam {
DEFAULTS,
ASK_USER,
};
PrinterQuery();
// PrintJobWorkerOwner implementation.
virtual void GetSettingsDone(const PrintSettings& new_settings,
PrintingContext::Result result) OVERRIDE;
virtual PrintJobWorker* DetachWorker(PrintJobWorkerOwner* new_owner) OVERRIDE;
virtual base::MessageLoop* message_loop() OVERRIDE;
virtual const PrintSettings& settings() const OVERRIDE;
virtual int cookie() const OVERRIDE;
// Initializes the printing context. It is fine to call this function multiple
// times to reinitialize the settings. |parent_view| parameter's window will
// be the owner of the print setting dialog box. It is unused when
// |ask_for_user_settings| is DEFAULTS.
void GetSettings(GetSettingsAskParam ask_user_for_settings,
gfx::NativeView parent_view,
int expected_page_count,
bool has_selection,
MarginType margin_type,
const base::Closure& callback);
// Updates the current settings with |new_settings| dictionary values.
void SetSettings(const base::DictionaryValue& new_settings,
const base::Closure& callback);
// Set a destination for the worker.
void SetWorkerDestination(PrintDestinationInterface* destination);
// Stops the worker thread since the client is done with this object.
void StopWorker();
// Returns true if a GetSettings() call is pending completion.
bool is_callback_pending() const;
PrintingContext::Result last_status() const { return last_status_; }
// Returns if a worker thread is still associated to this instance.
bool is_valid() const;
private:
virtual ~PrinterQuery();
// Lazy create the worker thread. There is one worker thread per print job.
void StartWorker(const base::Closure& callback);
// Main message loop reference. Used to send notifications in the right
// thread.
base::MessageLoop* const io_message_loop_;
// All the UI is done in a worker thread because many Win32 print functions
// are blocking and enters a message loop without your consent. There is one
// worker thread per print job.
scoped_ptr<PrintJobWorker> worker_;
// Cache of the print context settings for access in the UI thread.
PrintSettings settings_;
// Is the Print... dialog box currently shown.
bool is_print_dialog_box_shown_;
// Cookie that make this instance unique.
int cookie_;
// Results from the last GetSettingsDone() callback.
PrintingContext::Result last_status_;
// Callback waiting to be run.
base::Closure callback_;
DISALLOW_COPY_AND_ASSIGN(PrinterQuery);
};
} // namespace printing
#endif // CHROME_BROWSER_PRINTING_PRINTER_QUERY_H_
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