tab.h revision dc0f95d653279beabeb9817299e2902918ba123e 
1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROME_BROWSER_UI_VIEWS_TABS_TAB_H_
6#define CHROME_BROWSER_UI_VIEWS_TABS_TAB_H_
7#pragma once
8
9#include <string>
10
11#include "base/scoped_ptr.h"
12#include "chrome/browser/ui/views/tabs/base_tab.h"
13#include "ui/gfx/point.h"
14
15namespace ui {
16class MultiAnimation;
17class SlideAnimation;
18}
19
20///////////////////////////////////////////////////////////////////////////////
21//
22// TabRenderer
23//
24//  A View that renders a Tab, either in a TabStrip or in a DraggedTabView.
25//
26///////////////////////////////////////////////////////////////////////////////
27class Tab : public BaseTab {
28 public:
29  // The menu button's class name.
30  static const char kViewClassName[];
31
32  explicit Tab(TabController* controller);
33  virtual ~Tab();
34
35  // Start/stop the mini-tab title animation.
36  void StartMiniTabTitleAnimation();
37  void StopMiniTabTitleAnimation();
38
39  // Set the background offset used to match the image in the inactive tab
40  // to the frame image.
41  void set_background_offset(const gfx::Point& offset) {
42    background_offset_ = offset;
43  }
44
45  // Returns the minimum possible size of a single unselected Tab.
46  static gfx::Size GetMinimumUnselectedSize();
47  // Returns the minimum possible size of a selected Tab. Selected tabs must
48  // always show a close button and have a larger minimum size than unselected
49  // tabs.
50  static gfx::Size GetMinimumSelectedSize();
51  // Returns the preferred size of a single Tab, assuming space is
52  // available.
53  static gfx::Size GetStandardSize();
54
55  // Returns the width for mini-tabs. Mini-tabs always have this width.
56  static int GetMiniWidth();
57
58 protected:
59  // BaseTab overrides:
60  virtual const gfx::Rect& GetTitleBounds() const;
61  virtual const gfx::Rect& GetIconBounds() const;
62  virtual void DataChanged(const TabRendererData& old);
63
64 private:
65  // Overridden from views::View:
66  virtual void OnPaint(gfx::Canvas* canvas);
67  virtual void Layout();
68  virtual void OnThemeChanged();
69  virtual std::string GetClassName() const;
70  virtual bool HasHitTestMask() const;
71  virtual void GetHitTestMask(gfx::Path* path) const;
72  virtual bool GetTooltipTextOrigin(const gfx::Point& p, gfx::Point* origin);
73  virtual void OnMouseMoved(const views::MouseEvent& event);
74
75  // Paint various portions of the Tab
76  void PaintTabBackground(gfx::Canvas* canvas);
77  void PaintInactiveTabBackgroundWithTitleChange(gfx::Canvas* canvas);
78  void PaintInactiveTabBackground(gfx::Canvas* canvas);
79  void PaintActiveTabBackground(gfx::Canvas* canvas);
80  SkBitmap DrawHoverGlowBitmap(int width, int height);
81
82  // Returns the number of favicon-size elements that can fit in the tab's
83  // current size.
84  int IconCapacity() const;
85
86  // Returns whether the Tab should display a favicon.
87  bool ShouldShowIcon() const;
88
89  // Returns whether the Tab should display a close button.
90  bool ShouldShowCloseBox() const;
91
92  // Gets the throb value for the tab. When a tab is not selected the
93  // active background is drawn at |GetThrobValue()|%. This is used for hover,
94  // mini tab title change and pulsing.
95  double GetThrobValue();
96
97  // Performs a one-time initialization of static resources such as tab images.
98  static void InitTabResources();
99
100  // Loads the images to be used for the tab background.
101  static void LoadTabImages();
102
103  // The bounds of various sections of the display.
104  gfx::Rect favicon_bounds_;
105  gfx::Rect title_bounds_;
106
107  // The offset used to paint the inactive background image.
108  gfx::Point background_offset_;
109
110  // The center point for the radial hover glow.
111  gfx::Point hover_point_;
112
113  // Animation used when the title of an inactive mini tab changes.
114  scoped_ptr<ui::MultiAnimation> mini_title_animation_;
115
116  struct TabImage {
117    SkBitmap* image_l;
118    SkBitmap* image_c;
119    SkBitmap* image_r;
120    int l_width;
121    int r_width;
122    int y_offset;
123  };
124  static TabImage tab_active_;
125  static TabImage tab_inactive_;
126  static TabImage tab_alpha_;
127
128  // Whether we're showing the icon. It is cached so that we can detect when it
129  // changes and layout appropriately.
130  bool showing_icon_;
131
132  // Whether we are showing the close button. It is cached so that we can
133  // detect when it changes and layout appropriately.
134  bool showing_close_button_;
135
136  // The current color of the close button.
137  SkColor close_button_color_;
138
139  static bool initialized_;
140
141  DISALLOW_COPY_AND_ASSIGN(Tab);
142};
143
144#endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_H_
145