OLD | NEW |
| (Empty) |
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_TRI_VIEW_H_ | |
6 #define ASH_COMMON_SYSTEM_TRAY_TRI_VIEW_H_ | |
7 | |
8 #include <memory> | |
9 | |
10 #include "ash/ash_export.h" | |
11 #include "base/macros.h" | |
12 #include "ui/gfx/geometry/insets.h" | |
13 #include "ui/gfx/geometry/size.h" | |
14 #include "ui/views/view.h" | |
15 | |
16 namespace views { | |
17 class Border; | |
18 class BoxLayout; | |
19 class LayoutManager; | |
20 } // namespace views | |
21 | |
22 namespace ash { | |
23 class SizeRangeLayout; | |
24 | |
25 // A View which has 3 child containers (START, CENTER, END) which can be | |
26 // arranged vertically or horizontally. The child containers can have minimum | |
27 // and/or maximum preferred size defined as well as a flex weight that is used | |
28 // to distribute excess space across the main axis, i.e. flexible width for the | |
29 // horizontal orientation. By default all the containers have a flex weight of | |
30 // 0, meaning no flexibility, and no minimum or maximum size. | |
31 // | |
32 // Child views should not be added to |this| directly via View::AddChildView() | |
33 // or View::AddChildViewAt() and will fail a DCHECK() if attempted. | |
34 // | |
35 // Views added to the containers are laid out as per the LayoutManager that has | |
36 // been installed on that container. By default a BoxLayout manager is installed | |
37 // on each container with the same orientation as |this| has been created with. | |
38 // The default BoxLayout will use a center alignment for both the main axis and | |
39 // cross axis alignment. | |
40 class ASH_EXPORT TriView : public views::View { | |
41 public: | |
42 enum class Orientation { | |
43 HORIZONTAL, | |
44 VERTICAL, | |
45 }; | |
46 | |
47 // The different containers that child Views can be added to. | |
48 enum class Container { START = 0, CENTER = 1, END = 2 }; | |
49 | |
50 // Constructs a layout with horizontal orientation and 0 padding between | |
51 // containers. | |
52 TriView(); | |
53 | |
54 // Creates |this| with a Horizontal orientation and the specified padding | |
55 // between containers. | |
56 // | |
57 // TODO(bruthig): The |padding_between_containers| can only be set on | |
58 // BoxLayouts during construction. Investigate whether this can be a mutable | |
59 // property of BoxLayouts and if so consider dropping it as a constructor | |
60 // parameter here. | |
61 explicit TriView(int padding_between_containers); | |
62 | |
63 // Creates |this| with the specified orientation and 0 padding between | |
64 // containers. | |
65 explicit TriView(Orientation orientation); | |
66 | |
67 // Creates this with the specified |orientation| and | |
68 // |padding_between_containers|. | |
69 TriView(Orientation orientation, int padding_between_containers); | |
70 | |
71 ~TriView() override; | |
72 | |
73 // Set the minimum height for all containers to |height|. | |
74 void SetMinHeight(int height); | |
75 | |
76 // Set the minimum size for the given |container|. | |
77 void SetMinSize(Container container, const gfx::Size& size); | |
78 | |
79 // Get the minimum size for the given |container|. | |
80 gfx::Size GetMinSize(Container container); | |
81 | |
82 // Set the maximum size for the given |container|. | |
83 void SetMaxSize(Container container, const gfx::Size& size); | |
84 | |
85 // Adds the child |view| to the specified |container|. | |
86 void AddView(Container container, views::View* view); | |
87 | |
88 // Removes all the children from the specified |container|. If | |
89 // |delete_children| is true, the views are deleted, unless marked as not | |
90 // parent owned. | |
91 void RemoveAllChildren(Container container, bool delete_children); | |
92 | |
93 // During layout the |insets| are applied to the host views entire space | |
94 // before allocating the remaining space to the container views. | |
95 void SetInsets(const gfx::Insets& insets); | |
96 | |
97 // Sets the border for the given |container|. | |
98 void SetContainerBorder(Container container, | |
99 std::unique_ptr<views::Border> border); | |
100 | |
101 // Sets whether the |container| is visible. During a layout the space will be | |
102 // allocated to the visible containers only. i.e. non-visible containers will | |
103 // not be allocated any space. | |
104 void SetContainerVisible(Container container, bool visible); | |
105 | |
106 // Sets the flex weight for the given |container|. Using the preferred size as | |
107 // the basis, free space along the main axis is distributed to views in the | |
108 // ratio of their flex weights. Similarly, if the views will overflow the | |
109 // parent, space is subtracted in these ratios. | |
110 // | |
111 // A flex of 0 means this view is not resized. Flex values must not be | |
112 // negative. | |
113 // | |
114 // Note that non-zero flex values will take precedence over size constraints. | |
115 // i.e. even if |container| has a max size set the space allocated during | |
116 // layout may be larger if |flex| > 0 and similar for min size constraints. | |
117 void SetFlexForContainer(Container container, int flex); | |
118 | |
119 // Sets the |layout_manager| used by the given |container|. | |
120 void SetContainerLayout(Container container, | |
121 std::unique_ptr<views::LayoutManager> layout_manager); | |
122 | |
123 protected: | |
124 // View: | |
125 void ViewHierarchyChanged( | |
126 const views::View::ViewHierarchyChangedDetails& details) override; | |
127 const char* GetClassName() const override; | |
128 | |
129 private: | |
130 friend class TriViewTest; | |
131 | |
132 // Returns the View for the given |container|. | |
133 views::View* GetContainer(Container container); | |
134 | |
135 // Returns the layout manager for the given |container|. | |
136 SizeRangeLayout* GetLayoutManager(Container container); | |
137 | |
138 // Type spcific layout manager installed on |this|. Responsible for laying out | |
139 // the container Views. | |
140 views::BoxLayout* box_layout_; | |
141 | |
142 SizeRangeLayout* start_container_layout_manager_; | |
143 SizeRangeLayout* center_container_layout_manager_; | |
144 SizeRangeLayout* end_container_layout_manager_; | |
145 | |
146 // In order to detect direct manipulation of child views the | |
147 // ViewHierarchyChanged() event override fails on a DCHECK. However, we need | |
148 // to manipulate the child views during construction/destruction so this flag | |
149 // is used to disable the DCHECK during construction/destruction. | |
150 bool enable_hierarchy_changed_dcheck_ = false; | |
151 | |
152 DISALLOW_COPY_AND_ASSIGN(TriView); | |
153 }; | |
154 | |
155 } // namespace ash | |
156 | |
157 #endif // ASH_COMMON_SYSTEM_TRAY_TRI_VIEW_H_ | |
OLD | NEW |