1 // Copyright 2019 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 UI_PLATFORM_WINDOW_PLATFORM_WINDOW_DELEGATE_H_ 6 #define UI_PLATFORM_WINDOW_PLATFORM_WINDOW_DELEGATE_H_ 7 8 #include "base/component_export.h" 9 #include "base/optional.h" 10 #include "ui/gfx/native_widget_types.h" 11 12 namespace gfx { 13 class Rect; 14 class Size; 15 } // namespace gfx 16 17 namespace ui { 18 19 class Event; 20 21 enum class PlatformWindowState { 22 kUnknown, 23 kMaximized, 24 kMinimized, 25 kNormal, 26 kFullScreen, 27 }; 28 COMPONENT_EXPORT(PLATFORM_WINDOW)29class COMPONENT_EXPORT(PLATFORM_WINDOW) PlatformWindowDelegate { 30 public: 31 PlatformWindowDelegate(); 32 virtual ~PlatformWindowDelegate(); 33 34 // Note that |new_bounds| is in physical screen coordinates. 35 virtual void OnBoundsChanged(const gfx::Rect& new_bounds) = 0; 36 37 // Note that |damaged_region| is in the platform-window's coordinates, in 38 // physical pixels. 39 virtual void OnDamageRect(const gfx::Rect& damaged_region) = 0; 40 41 virtual void DispatchEvent(Event* event) = 0; 42 43 virtual void OnCloseRequest() = 0; 44 virtual void OnClosed() = 0; 45 46 virtual void OnWindowStateChanged(PlatformWindowState new_state) = 0; 47 48 virtual void OnLostCapture() = 0; 49 50 virtual void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) = 0; 51 52 // Notifies the delegate that the widget is about to be destroyed. 53 virtual void OnWillDestroyAcceleratedWidget() = 0; 54 55 // Notifies the delegate that the widget cannot be used anymore until 56 // a new widget is made available through OnAcceleratedWidgetAvailable(). 57 // Must not be called when the PlatformWindow is being destroyed. 58 virtual void OnAcceleratedWidgetDestroyed() = 0; 59 60 virtual void OnActivationChanged(bool active) = 0; 61 62 // Requests size constraints for the PlatformWindow. 63 virtual base::Optional<gfx::Size> GetMinimumSizeForWindow(); 64 virtual base::Optional<gfx::Size> GetMaximumSizeForWindow(); 65 66 // Called when the location of mouse pointer entered the window. This is 67 // different from ui::ET_MOUSE_ENTERED which may not be generated when mouse 68 // is captured either by implicitly or explicitly. 69 virtual void OnMouseEnter() = 0; 70 }; 71 72 } // namespace ui 73 74 #endif // UI_PLATFORM_WINDOW_PLATFORM_WINDOW_DELEGATE_H_ 75