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// Copyright (c) 2011 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_PANEL_STRIP_H_
#define CHROME_BROWSER_UI_PANELS_PANEL_STRIP_H_
#pragma once
#include <set>
#include <vector>
#include "base/basictypes.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/ui/panels/auto_hiding_desktop_bar.h"
#include "chrome/browser/ui/panels/panel.h"
#include "chrome/browser/ui/panels/panel_mouse_watcher_observer.h"
#include "ui/gfx/rect.h"
class Browser;
class PanelManager;
// This class manages a group of panels displayed in a horizontal strip,
// positioning the panels and controlling how they are displayed.
// Panels in the strip appear minimized, showing title-only or expanded.
// All panels in the strip are contained within the bounds of the strip.
class PanelStrip : public PanelMouseWatcherObserver {
public:
typedef std::vector<Panel*> Panels;
explicit PanelStrip(PanelManager* panel_manager);
virtual ~PanelStrip();
// Sets the bounds of the panel strip.
// |area| is in screen coordinates.
void SetDisplayArea(const gfx::Rect& area);
// Adds a panel to the strip. The panel may be a newly created panel or one
// that is transitioning from another grouping of panels.
void AddPanel(Panel* panel);
// Returns |false| if the panel is not in the strip.
bool Remove(Panel* panel);
void RemoveAll();
// Drags the given panel.
void StartDragging(Panel* panel);
void Drag(int delta_x);
void EndDragging(bool cancelled);
// Invoked when a panel's expansion state changes.
void OnPanelExpansionStateChanged(Panel* panel,
Panel::ExpansionState old_state);
// Invoked when the preferred window size of the given panel might need to
// get changed.
void OnPreferredWindowSizeChanged(
Panel* panel, const gfx::Size& preferred_window_size);
// 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;
// num_panels() and panels() only includes panels in the panel strip that
// do NOT have a temporary layout.
int num_panels() const { return panels_.size(); }
const Panels& panels() const { return panels_; }
bool is_dragging_panel() const;
gfx::Rect display_area() const { return display_area_; }
int GetMaxPanelWidth() const;
int GetMaxPanelHeight() const;
int StartingRightPosition() const;
void OnAutoHidingDesktopBarVisibilityChanged(
AutoHidingDesktopBar::Alignment alignment,
AutoHidingDesktopBar::Visibility visibility);
void OnFullScreenModeChanged(bool is_full_screen);
#ifdef UNIT_TEST
int num_temporary_layout_panels() const {
return panels_in_temporary_layout_.size();
}
#endif
private:
enum TitlebarAction {
NO_ACTION,
BRING_UP,
BRING_DOWN
};
// Overridden from PanelMouseWatcherObserver:
virtual void OnMouseMove(const gfx::Point& mouse_position) OVERRIDE;
// Keep track of the minimized panels to control mouse watching.
void IncrementMinimizedPanels();
void DecrementMinimizedPanels();
// Handles all the panels that're delayed to be removed.
void DelayedRemove();
// Does the actual remove. Caller is responsible for rearranging
// the panel strip if necessary.
// Returns |false| if panel is not in the strip.
bool DoRemove(Panel* panel);
// Rearranges the positions of the panels in the strip.
// Handles moving panels to/from overflow area as needed.
// This is called when the display space has been changed, i.e. working
// area being changed or a panel being closed.
void Rearrange();
// Help functions to drag the given panel.
void DragLeft();
void DragRight();
// 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();
int GetRightMostAvailablePosition() const;
// Called by AddPanel() after a delay to move a newly created panel from
// the panel strip to overflow because the panel could not fit
// within the bounds of the panel strip. New panels are first displayed
// in the panel strip, then moved to overflow so that all created
// panels are (at least briefly) visible before entering overflow.
void DelayedMovePanelToOverflow(Panel* panel);
PanelManager* panel_manager_; // Weak, owns us.
// All panels in the panel strip must fit within this area.
gfx::Rect display_area_;
Panels panels_;
// Stores the panels that are pending to remove. We want to delay the removal
// when we're in the process of the dragging.
Panels panels_pending_to_remove_;
// Stores newly created panels that have a temporary layout until they
// are moved to overflow after a delay.
std::set<Panel*> panels_in_temporary_layout_;
int minimized_panel_count_;
bool are_titlebars_up_;
// Panel to drag.
size_t dragging_panel_index_;
// Original x coordinate of the panel to drag. This is used to get back to
// the original position when we cancel the dragging.
int dragging_panel_original_x_;
// Bounds of the panel to drag. It is first set to the original bounds when
// the dragging happens. Then it is updated to the position that will be set
// to when the dragging ends.
gfx::Rect dragging_panel_bounds_;
// Delayed transitions support. Sometimes transitions between minimized and
// title-only states are delayed, for better usability with Taskbars/Docks.
TitlebarAction delayed_titlebar_action_;
// Owned by MessageLoop after posting.
base::WeakPtrFactory<PanelStrip> titlebar_action_factory_;
static const int kPanelsHorizontalSpacing = 4;
// Absolute minimum width and height for panels, including non-client area.
// Should only be big enough to accomodate a close button on the reasonably
// recognisable titlebar.
static const int kPanelMinWidth;
static const int kPanelMinHeight;
DISALLOW_COPY_AND_ASSIGN(PanelStrip);
};
#endif // CHROME_BROWSER_UI_PANELS_PANEL_STRIP_H_
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