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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 "third_party/mojo_services/src/view_manager/public/cpp/types.h" |
| 9 #include "third_party/mojo_services/src/view_manager/public/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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