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// Copyright (c) 2006-2008 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_WINDOW_SIZER_H__
#define CHROME_BROWSER_WINDOW_SIZER_H__
#include "base/gfx/rect.h"
#include "base/logging.h"
#include "testing/gtest/include/gtest/gtest_prod.h"
///////////////////////////////////////////////////////////////////////////////
// WindowSizer
//
// A class that determines the best new size and position for a window to be
// shown at based several factors, including the position and size of the last
// window of the same type, the last saved bounds of the window from the
// previous session, and default system metrics if neither of the above two
// conditions exist. The system has built-in providers for monitor metrics
// and persistent storage (using preferences) but can be overrided with mocks
// for testing.
//
class WindowSizer {
public:
class MonitorInfoProvider;
class StateProvider;
// The WindowSizer assumes ownership of these objects.
WindowSizer(StateProvider* state_provider,
MonitorInfoProvider* monitor_info_provider);
virtual ~WindowSizer();
// An interface implemented by an object that can retrieve information about
// the monitors on the system.
class MonitorInfoProvider {
public:
virtual ~MonitorInfoProvider() { }
// Returns the bounds of the working rect of the primary monitor.
virtual gfx::Rect GetPrimaryMonitorWorkingRect() const = 0;
// Returns the bounds of the entire primary screen.
virtual gfx::Rect GetPrimaryMonitorBounds() const = 0;
// Returns the bounds of the working rect of the monitor that most closely
// intersects the provided bounds.
virtual gfx::Rect GetMonitorWorkingRectMatching(
const gfx::Rect& match_rect) const = 0;
// Returns the delta between the working rect and the monitor size of the
// monitor that most closely intersects the provided bounds.
virtual gfx::Point GetBoundsOffsetMatching(
const gfx::Rect& match_rect) const = 0;
// Returns the number of monitors on the system.
virtual int GetMonitorCount() const = 0;
// Returns the bounds of the working rect of the monitor at the specified
// index.
virtual gfx::Rect GetWorkingRectAt(int index) const = 0;
};
// An interface implemented by an object that can retrieve state from either a
// persistent store or an existing window.
class StateProvider {
public:
virtual ~StateProvider() { }
// Retrieve the persisted bounds of the window. Returns true if there was
// persisted data to retrieve state information, false otherwise.
virtual bool GetPersistentState(gfx::Rect* bounds,
bool* maximized) const = 0;
// Retrieve the bounds of the most recent window of the matching type.
// Returns true if there was a last active window to retrieve state
// information from, false otherwise.
virtual bool GetLastActiveWindowState(gfx::Rect* bounds) const = 0;
};
// Determines the size, position and maximized state for the browser window.
// See documentation for DetermineWindowBounds below.
static void GetBrowserWindowBounds(const std::wstring& app_name,
const gfx::Rect& specified_bounds,
gfx::Rect* window_bounds,
bool* maximized);
// Returns the default origin for popups of the given size.
static gfx::Point GetDefaultPopupOrigin(const gfx::Size& size);
// Determines the position, size and maximized state for a window as it is
// created. This function uses several strategies to figure out optimal size
// and placement, first looking for an existing active window, then falling
// back to persisted data from a previous session, finally utilizing a default
// algorithm. If |specified_bounds| are non-empty, this value is returned
// instead. For use only in testing.
//
// NOTE: |maximized| is only set if we're restoring a saved maximized window.
// When creating a new window based on an existing active window, standard
// Windows behavior is to have it always be nonmaximized, even if the existing
// window is maximized.
void DetermineWindowBounds(const gfx::Rect& specified_bounds,
gfx::Rect* bounds,
bool* maximized) const;
private:
explicit WindowSizer(const std::wstring& app_name);
void Init(StateProvider* state_provider,
MonitorInfoProvider* monitor_info_provider);
// Gets the size and placement of the last window. Returns true if this data
// is valid, false if there is no last window and the application should
// restore saved state from preferences using RestoreWindowPosition.
bool GetLastWindowBounds(gfx::Rect* bounds) const;
// Gets the size and placement of the last window in the last session, saved
// in local state preferences. Returns true if local state exists containing
// this information, false if this information does not exist and a default
// size should be used.
bool GetSavedWindowBounds(gfx::Rect* bounds, bool* maximized) const;
// Gets the default window position and size if there is no last window and
// no saved window placement in prefs. This function determines the default
// size based on monitor size, etc.
void GetDefaultWindowBounds(gfx::Rect* default_bounds) const;
// The edge of the work area to check for out-of-bounds.
enum Edge { TOP, LEFT, BOTTOM, RIGHT };
// Return true if the position is over the specified edge on the valid
// monitor work are rects.
bool PositionIsOffscreen(int position, Edge edge) const;
// Adjust the bounds specified in |bounds| so that they fit completely within
// the work area of the monitor that contains |other_bounds|.
void AdjustBoundsToBeVisibleOnMonitorContaining(
const gfx::Rect& other_bounds,
gfx::Rect* bounds /* inout */) const;
// Providers for persistent storage and monitor metrics.
StateProvider* state_provider_;
MonitorInfoProvider* monitor_info_provider_;
DISALLOW_EVIL_CONSTRUCTORS(WindowSizer);
};
#endif // #ifndef CHROME_BROWSER_WINDOW_SIZER_H__
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