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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 <memory>
#include "base/callback.h"
#include "base/macros.h"
#include "chrome/browser/printing/print_job_worker_owner.h"
namespace base {
class DictionaryValue;
}
namespace printing {
class PrintJobWorker;
// Query the printer for settings.
class PrinterQuery : public PrintJobWorkerOwner {
public:
// GetSettings() UI parameter.
enum class GetSettingsAskParam {
DEFAULTS,
ASK_USER,
};
// Can only be called on the IO thread.
PrinterQuery(int render_process_id, int render_frame_id);
// PrintJobWorkerOwner implementation.
void GetSettingsDone(const PrintSettings& new_settings,
PrintingContext::Result result) override;
std::unique_ptr<PrintJobWorker> DetachWorker(
PrintJobWorkerOwner* new_owner) override;
const PrintSettings& settings() const override;
int cookie() const override;
// Initializes the printing context. It is fine to call this function multiple
// times to reinitialize the settings. |web_contents_observer| can be queried
// to find 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,
int expected_page_count,
bool has_selection,
MarginType margin_type,
bool is_scripted,
bool is_modifiable,
base::OnceClosure callback);
// Updates the current settings with |new_settings| dictionary values.
virtual void SetSettings(std::unique_ptr<base::DictionaryValue> new_settings,
base::OnceClosure callback);
#if defined(OS_CHROMEOS)
// Updates the current settings with |new_settings|.
void SetSettingsFromPOD(std::unique_ptr<printing::PrintSettings> new_settings,
base::OnceClosure callback);
#endif
// Stops the worker thread since the client is done with this object.
virtual 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;
protected:
// For unit tests to manually set the print callback.
void set_callback(base::OnceClosure callback);
// 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.
std::unique_ptr<PrintJobWorker> worker_;
// Refcounted class.
~PrinterQuery() override;
private:
// Lazy create the worker thread. There is one worker thread per print job.
void StartWorker(base::OnceClosure callback);
// 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_ = false;
// Cookie that make this instance unique.
int cookie_;
// Results from the last GetSettingsDone() callback.
PrintingContext::Result last_status_ = PrintingContext::FAILED;
// Callback waiting to be run.
base::OnceClosure callback_;
DISALLOW_COPY_AND_ASSIGN(PrinterQuery);
};
} // namespace printing
#endif // CHROME_BROWSER_PRINTING_PRINTER_QUERY_H_
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