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1 // Copyright 2016 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 ASH_COMMON_SYSTEM_TRAY_THREE_VIEW_LAYOUT_H_ | |
6 #define ASH_COMMON_SYSTEM_TRAY_THREE_VIEW_LAYOUT_H_ | |
7 | |
8 #include <memory> | |
9 | |
10 #include "base/macros.h" | |
11 #include "ui/gfx/geometry/insets.h" | |
12 #include "ui/gfx/geometry/size.h" | |
13 #include "ui/views/layout/layout_manager.h" | |
14 | |
15 namespace views { | |
16 class BoxLayout; | |
17 class View; | |
18 } // namespace views | |
19 | |
20 namespace ash { | |
21 class SizeRangeLayout; | |
22 | |
23 // A layout manager that has 3 child containers (START, CENTER, END) which can | |
24 // be arranged vertically or horizontally. The child containers can have | |
25 // minimum and/or maximum preferred size defined as well as a flex weight that | |
26 // is used to distribute excess space across the main axis, i.e. flexible width | |
27 // for the horizontal orientation. By default all the containers have a flex | |
28 // weight of 0, meaning no flexibility, and no minimum or maximum size. | |
29 // | |
30 // Views are laid out within each container as per the LayoutManager that has | |
31 // been installed on that container. By default a BoxLayout manager is installed | |
32 // on each container with the same orientation as this has been created with. | |
33 // The default BoxLayout will use a center alignment for both the main axis and | |
34 // cross axis alignment. | |
35 class ThreeViewLayout : public views::LayoutManager { | |
sky
2016/10/14 22:11:12
How is this different than BoxLayout? I get that i
bruthig
2016/10/17 15:53:12
It's different in that each of the Container views
| |
36 public: | |
37 enum Orientation { | |
38 HORIZONTAL, | |
39 VERTICAL, | |
40 }; | |
41 | |
42 // The different containers that child Views can be added to. | |
43 enum Container { START, CENTER, END }; | |
44 | |
45 // Constructs a layout with Horizontal orientation. | |
46 // | |
47 // TODO(bruthig): The |padding_between_items| can only be set on BoxLayouts | |
48 // during construction. Investigate whether this can be a mutable property of | |
49 // BoxLayouts and if so consider dropping it as a constructor parameter here. | |
50 explicit ThreeViewLayout(int padding_between_items); | |
51 | |
52 // Constructs a layout with the specified orientation and padding between | |
53 // child Views. | |
54 ThreeViewLayout(Orientation orientation, int padding_between_items); | |
55 | |
56 ~ThreeViewLayout() override; | |
57 | |
58 // Set the minimum cross axis size for the layout, i.e. the minimum height for | |
59 // a horizontal orientation. | |
60 void SetMinCrossAxisSize(int min_size); | |
61 | |
62 // Set the minimum size for the given |container|. | |
63 void SetMinSize(Container container, const gfx::Size& size); | |
64 | |
65 // Set the maximum size for the given |container|. | |
66 void SetMaxSize(Container container, const gfx::Size& size); | |
67 | |
68 // Adds the child |view| to the specified |container|. | |
69 void AddView(Container container, views::View* view); | |
70 | |
71 // Removes all current children from the specified |container| and adds the | |
72 // child |view| to it. | |
73 void SetView(Container container, views::View* view); | |
74 | |
75 // Sets the |insets| that union of the Container spaces will be laied out | |
76 // within. | |
77 void SetInsets(const gfx::Insets& insets); | |
78 | |
79 // Sets the |insets| within the given |container|. | |
80 void SetInsets(Container container, const gfx::Insets& insets); | |
81 | |
82 // Sets wither the |container| is visible. When a container is set to | |
83 // not-visible its space will be distributed to the other visible containers. | |
84 void SetContainerVisible(Container container, bool visible); | |
85 | |
86 // Sets the flex weight for the given |container|. Using the preferred size as | |
87 // the basis, free space along the main axis is distributed to views in the | |
88 // ratio of their flex weights. Similarly, if the views will overflow the | |
89 // parent, space is subtracted in these ratios. | |
90 // | |
91 // A flex of 0 means this view is not resized. Flex values must not be | |
92 // negative. | |
93 void SetFlexForView(Container container, int flex); | |
94 | |
95 // Sets the |layout_manager| used by the given |container|. | |
96 void SetLayoutManager(Container container, | |
97 std::unique_ptr<LayoutManager> layout_manager); | |
98 | |
99 // LayoutManager: | |
100 void Installed(views::View* host) override; | |
101 void Uninstalled(views::View* host) override; | |
102 void Layout(views::View* host) override; | |
103 gfx::Size GetPreferredSize(const views::View* host) const override; | |
104 int GetPreferredHeightForWidth(const views::View* host, | |
105 int width) const override; | |
106 void ViewAdded(views::View* host, views::View* view) override; | |
107 void ViewRemoved(views::View* host, views::View* view) override; | |
108 | |
109 private: | |
110 // Creates a default LayoutManager for the given |orientation|. | |
111 std::unique_ptr<views::LayoutManager> CreateDefaultLayoutManager( | |
112 Orientation orientation) const; | |
113 | |
114 // Returns the View for the given |container|. | |
115 views::View* GetContainer(Container container) const; | |
116 | |
117 // Returns the layout manager for the given |container|. | |
118 SizeRangeLayout* GetLayoutManager(Container container) const; | |
119 | |
120 // The layout manager that lays out the different Container Views. | |
121 std::unique_ptr<views::BoxLayout> box_layout_; | |
122 | |
123 // The host View that this layout manager has been installed on. | |
124 views::View* host_ = nullptr; | |
125 | |
126 views::View* start_container_ = nullptr; | |
127 SizeRangeLayout* start_container_layout_manager_ = nullptr; | |
128 | |
129 views::View* center_container_ = nullptr; | |
130 SizeRangeLayout* center_container_layout_manager_ = nullptr; | |
131 | |
132 views::View* end_container_ = nullptr; | |
133 SizeRangeLayout* end_container_layout_manager_ = nullptr; | |
134 | |
135 DISALLOW_COPY_AND_ASSIGN(ThreeViewLayout); | |
136 }; | |
137 | |
138 } // namespace ash | |
139 | |
140 #endif // ASH_COMMON_SYSTEM_TRAY_THREE_VIEW_LAYOUT_H_ | |
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