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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_UI_PANELS_DOCKED_PANEL_COLLECTION_H_
#define CHROME_BROWSER_UI_PANELS_DOCKED_PANEL_COLLECTION_H_
#include <list>
#include <set>
#include "base/basictypes.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/ui/panels/display_settings_provider.h"
#include "chrome/browser/ui/panels/panel.h"
#include "chrome/browser/ui/panels/panel_collection.h"
#include "chrome/browser/ui/panels/panel_mouse_watcher_observer.h"
#include "ui/gfx/geometry/rect.h"
class PanelManager;
// This class manages a group of panels that could be docked to the bottom of
// screen.
class DockedPanelCollection :
public PanelCollection,
public PanelMouseWatcherObserver,
public DisplaySettingsProvider::DesktopBarObserver {
public:
typedef std::list<Panel*> Panels;
explicit DockedPanelCollection(PanelManager* panel_manager);
~DockedPanelCollection() override;
// PanelCollection OVERRIDES:
void OnDisplayChanged() override;
// Rearranges the positions of the panels in the collection
// and reduces their width when there is not enough room.
// This is called when the display space has been changed, i.e. working
// area being changed or a panel being closed.
void RefreshLayout() override;
// Adds a panel to the collection. The panel may be a newly created panel or
// one that is transitioning from another grouping of panels.
void AddPanel(Panel* panel, PositioningMask positioning_mask) override;
void RemovePanel(Panel* pane, RemovalReason reasonl) override;
void CloseAll() override;
void ResizePanelWindow(Panel* panel,
const gfx::Size& preferred_window_size) override;
panel::Resizability GetPanelResizability(const Panel* panel) const override;
void OnPanelResizedByMouse(Panel* panel,
const gfx::Rect& new_bounds) override;
void OnPanelAttentionStateChanged(Panel* panel) override;
void OnPanelTitlebarClicked(Panel* panel,
panel::ClickModifier modifier) override;
void ActivatePanel(Panel* panel) override;
void MinimizePanel(Panel* panel) override;
void RestorePanel(Panel* panel) override;
void OnMinimizeButtonClicked(Panel* panel,
panel::ClickModifier modifier) override;
void OnRestoreButtonClicked(Panel* panel,
panel::ClickModifier modifier) override;
bool CanShowMinimizeButton(const Panel* panel) const override;
bool CanShowRestoreButton(const Panel* panel) const override;
bool IsPanelMinimized(const Panel* panel) const override;
bool UsesAlwaysOnTopPanels() const override;
void SavePanelPlacement(Panel* panel) override;
void RestorePanelToSavedPlacement() override;
void DiscardSavedPanelPlacement() override;
void UpdatePanelOnCollectionChange(Panel* panel) override;
void OnPanelExpansionStateChanged(Panel* panel) override;
void OnPanelActiveStateChanged(Panel* panel) override;
gfx::Rect GetInitialPanelBounds(
const gfx::Rect& requested_bounds) const override;
// Returns true if we should bring up the titlebars, given the current mouse
// point.
bool ShouldBringUpTitlebars(int mouse_x, int mouse_y) const;
// Brings up or down the titlebars for all minimized panels.
void BringUpOrDownTitlebars(bool bring_up);
// Returns the bottom position for the panel per its expansion state. If auto-
// hide bottom bar is present, we want to move the minimized panel to the
// bottom of the screen, not the bottom of the work area.
int GetBottomPositionForExpansionState(
Panel::ExpansionState expansion_state) const;
// Returns panel width to be used, taking into account possible "squeezing"
// due to lack of space in the collection.
int WidthToDisplayPanelInCollection(bool is_for_active_panel,
double squeeze_factor,
int full_width) const;
bool HasPanel(Panel* panel) const;
// num_panels() and panels() only includes panels in the collection that
// do NOT have a temporary layout.
int num_panels() const { return panels_.size(); }
const Panels& panels() const { return panels_; }
Panel* last_panel() const { return panels_.empty() ? NULL : panels_.back(); }
gfx::Rect work_area() const { return work_area_; }
int StartingRightPosition() const;
#ifdef UNIT_TEST
int minimized_panel_count() const {return minimized_panel_count_; }
#endif
private:
friend class DockedPanelDragHandler;
enum TitlebarAction {
NO_ACTION,
BRING_UP,
BRING_DOWN
};
struct PanelPlacement {
Panel* panel;
// Used to remember the panel to the left of |panel|, if any, for use when
// restoring the position of |panel|.
Panel* left_panel;
PanelPlacement() : panel(NULL), left_panel(NULL) { }
};
// Overridden from PanelMouseWatcherObserver:
void OnMouseMove(const gfx::Point& mouse_position) override;
// Overridden from DisplaySettingsProvider::DesktopBarObserver:
void OnAutoHidingDesktopBarVisibilityChanged(
DisplaySettingsProvider::DesktopBarAlignment alignment,
DisplaySettingsProvider::DesktopBarVisibility visibility) override;
void OnAutoHidingDesktopBarThicknessChanged(
DisplaySettingsProvider::DesktopBarAlignment alignment,
int thickness) override;
// Schedules a layout refresh with a short delay to avoid too much flicker.
void ScheduleLayoutRefresh();
// Keep track of the minimized panels to control mouse watching.
void UpdateMinimizedPanelCount();
// Minimizes or restores all panels in the collection.
void MinimizeAll();
void RestoreAll();
// Makes sure the panel's bounds reflect its expansion state and the
// panel is aligned at the bottom of the screen. Does not touch the x
// coordinate.
void AdjustPanelBoundsPerExpansionState(Panel* panel,
gfx::Rect* panel_bounds);
// Does the real job of bringing up or down the titlebars.
void DoBringUpOrDownTitlebars(bool bring_up);
// The callback for a delyed task, checks if it still need to perform
// the delayed action.
void DelayedBringUpOrDownTitlebarsCheck();
// Compute default bounds for a panel of |full_size| that would be used
// when adding the panel to the collection.
gfx::Point GetDefaultPositionForPanel(const gfx::Size& full_size) const;
int GetRightMostAvailablePosition() const;
PanelManager* panel_manager_; // Weak, owns us.
// All panels in the collection must fit within this area.
gfx::Rect work_area_;
Panels panels_;
int minimized_panel_count_;
bool are_titlebars_up_;
bool minimizing_all_; // True while minimizing all panels.
// Delayed transitions support. Sometimes transitions between minimized and
// title-only states are delayed, for better usability with Taskbars/Docks.
TitlebarAction delayed_titlebar_action_;
// Used to save the placement information for a panel.
PanelPlacement saved_panel_placement_;
static const int kPanelsHorizontalSpacing = 4;
// Owned by MessageLoop after posting.
base::WeakPtrFactory<DockedPanelCollection> titlebar_action_factory_;
// Owned by MessageLoop after posting.
base::WeakPtrFactory<DockedPanelCollection> refresh_action_factory_;
DISALLOW_COPY_AND_ASSIGN(DockedPanelCollection);
};
#endif // CHROME_BROWSER_UI_PANELS_DOCKED_PANEL_COLLECTION_H_
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