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1 // Copyright 2014 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 SERVICES_WINDOW_MANAGER_FOCUS_RULES_H_ | |
6 #define SERVICES_WINDOW_MANAGER_FOCUS_RULES_H_ | |
7 | |
8 #include "mojo/services/view_manager/cpp/types.h" | |
9 #include "mojo/services/view_manager/cpp/view.h" | |
10 | |
11 namespace window_manager { | |
12 | |
13 // Implemented by an object that establishes the rules about what can be | |
14 // focused or activated. | |
15 class FocusRules { | |
16 public: | |
17 virtual ~FocusRules() {} | |
18 | |
19 // Returns true if the children of |window| can be activated. | |
20 virtual bool SupportsChildActivation(mojo::View* window) const = 0; | |
21 | |
22 // Returns true if |view| is a toplevel view. Whether or not a view | |
23 // is considered toplevel is determined by a similar set of rules that | |
24 // govern activation and focus. Not all toplevel views are activatable, | |
25 // call CanActivateView() to determine if a view can be activated. | |
26 virtual bool IsToplevelView(mojo::View* view) const = 0; | |
27 // Returns true if |view| can be activated or focused. | |
28 virtual bool CanActivateView(mojo::View* view) const = 0; | |
29 // For CanFocusView(), null is supported, because null is a valid focusable | |
30 // view (in the case of clearing focus). | |
31 virtual bool CanFocusView(mojo::View* view) const = 0; | |
32 | |
33 // Returns the toplevel view containing |view|. Not all toplevel views | |
34 // are activatable, call GetActivatableView() instead to return the | |
35 // activatable view, which might be in a different hierarchy. | |
36 // Will return null if |view| is not contained by a view considered to be | |
37 // a toplevel view. | |
38 virtual mojo::View* GetToplevelView(mojo::View* view) const = 0; | |
39 // Returns the activatable or focusable view given an attempt to activate or | |
40 // focus |view|. Some possible scenarios (not intended to be exhaustive): | |
41 // - |view| is a child of a non-focusable view and so focus must be set | |
42 // according to rules defined by the delegate, e.g. to a parent. | |
43 // - |view| is an activatable view that is the transient parent of a modal | |
44 // view, so attempts to activate |view| should result in the modal | |
45 // transient being activated instead. | |
46 // These methods may return null if they are unable to find an activatable | |
47 // or focusable view given |view|. | |
48 virtual mojo::View* GetActivatableView(mojo::View* view) const = 0; | |
49 virtual mojo::View* GetFocusableView(mojo::View* view) const = 0; | |
50 | |
51 // Returns the next view to activate in the event that |ignore| is no longer | |
52 // activatable. This function is called when something is happening to | |
53 // |ignore| that means it can no longer have focus or activation, including | |
54 // but not limited to: | |
55 // - it or its parent hierarchy is being hidden, or removed from the | |
56 // RootView. | |
57 // - it is being destroyed. | |
58 // - it is being explicitly deactivated. | |
59 // |ignore| cannot be null. | |
60 virtual mojo::View* GetNextActivatableView(mojo::View* ignore) const = 0; | |
61 }; | |
62 | |
63 } // namespace window_manager | |
64 | |
65 #endif // SERVICES_WINDOW_MANAGER_FOCUS_RULES_H_ | |
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