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// Copyright (c) 2010 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.
#pragma once
#include <vector>
#include "base/basictypes.h"
#include "gfx/rect.h"
class Browser;
// 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 {
class MonitorInfoProvider;
class StateProvider;
// The WindowSizer assumes ownership of these objects.
WindowSizer(StateProvider* state_provider,
MonitorInfoProvider* monitor_info_provider);
virtual ~WindowSizer();
// Static factory methods to create default MonitorInfoProvider
// instances. The returned object is owned by the caller.
static MonitorInfoProvider* CreateDefaultMonitorInfoProvider();
// An interface implemented by an object that can retrieve information about
// the monitors on the system.
class MonitorInfoProvider {
virtual ~MonitorInfoProvider();
// Returns the bounds of the work area of the primary monitor.
virtual gfx::Rect GetPrimaryMonitorWorkArea() const = 0;
// Returns the bounds of the primary monitor.
virtual gfx::Rect GetPrimaryMonitorBounds() const = 0;
// Returns the bounds of the work area of the monitor that most closely
// intersects the provided bounds.
virtual gfx::Rect GetMonitorWorkAreaMatching(
const gfx::Rect& match_rect) const = 0;
// Returns the delta between the work area and the monitor bounds for the
// monitor that most closely intersects the provided bounds.
virtual gfx::Point GetBoundsOffsetMatching(
const gfx::Rect& match_rect) const = 0;
// Ensures number and coordinates of work areas are up-to-date. You must
// call this before calling either of the below functions, as work areas can
// change while the program is running.
virtual void UpdateWorkAreas() = 0;
// Returns the number of monitors on the system.
size_t GetMonitorCount() const {
return work_areas_.size();
// Returns the bounds of the work area of the monitor at the specified
// index.
gfx::Rect GetWorkAreaAt(size_t index) const {
return work_areas_[index];
std::vector<gfx::Rect> work_areas_;
// An interface implemented by an object that can retrieve state from either a
// persistent store or an existing window.
class StateProvider {
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,
gfx::Rect* work_area) 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 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;
// Determines the size, position and maximized state for the browser window.
// See documentation for DetermineWindowBounds above. Normally,
// |window_bounds| is calculated by calling GetLastActiveWindowState(). To
// explicitly specify a particular window to base the bounds on, pass in a
// non-NULL value for |browser|.
static void GetBrowserWindowBounds(const std::string& app_name,
const gfx::Rect& specified_bounds,
Browser* browser,
gfx::Rect* window_bounds,
bool* maximized);
// Returns the default origin for popups of the given size.
static gfx::Point GetDefaultPopupOrigin(const gfx::Size& size);
// How much horizontal and vertical offset there is between newly
// opened windows. This value may be different on each platform.
static const int kWindowTilePixels;
// The edge of the screen to check for out-of-bounds.
enum Edge { TOP, LEFT, BOTTOM, RIGHT };
explicit WindowSizer(const std::string& 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;
// Returns true if the specified position is "offscreen" for the given edge,
// meaning that it's outside all work areas in the direction of that edge.
bool PositionIsOffscreen(int position, Edge edge) const;
// Adjusts |bounds| to be visible onscreen, biased toward the work area of the
// monitor containing |other_bounds|. Despite the name, this doesn't
// guarantee the bounds are fully contained within this monitor's work rect;
// it just tried to ensure the edges are visible on _some_ work rect.
// If |saved_work_area| is non-empty, it is used to determine whether the
// monitor cofiguration has changed. If it has, bounds are repositioned and
// resized if necessary to make them completely contained in the current work
// area.
void AdjustBoundsToBeVisibleOnMonitorContaining(
const gfx::Rect& other_bounds,
const gfx::Rect& saved_work_area,
gfx::Rect* bounds) const;
// Providers for persistent storage and monitor metrics.
StateProvider* state_provider_;
MonitorInfoProvider* monitor_info_provider_;