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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_AURA_WINDOW_DELEGATE_H_
#define UI_AURA_WINDOW_DELEGATE_H_
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "ui/aura/aura_export.h"
#include "ui/aura/window.h"
#include "ui/events/event_constants.h"
#include "ui/events/event_handler.h"
#include "ui/gfx/native_widget_types.h"
class SkPath;
namespace gfx {
class Point;
class Rect;
class Size;
}
namespace ui {
class PaintContext;
}
namespace aura {
// Delegate interface for aura::Window.
class AURA_EXPORT WindowDelegate : public ui::EventHandler {
public:
// Returns the window's minimum size, or size 0,0 if there is no limit.
virtual gfx::Size GetMinimumSize() const = 0;
// Returns the window's maximum size, or size 0,0 if there is no limit.
virtual gfx::Size GetMaximumSize() const = 0;
// Called when the Window's position and/or size changes.
virtual void OnBoundsChanged(const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds) = 0;
// Returns the native cursor for the specified point, in window coordinates,
// or NULL for the default cursor.
virtual gfx::NativeCursor GetCursor(const gfx::Point& point) = 0;
// Returns the non-client component (see hit_test.h) containing |point|, in
// window coordinates.
virtual int GetNonClientComponent(const gfx::Point& point) const = 0;
// Returns true if event handling should descend into |child|. |location| is
// in terms of the Window.
virtual bool ShouldDescendIntoChildForEventHandling(
Window* child,
const gfx::Point& location) = 0;
// Returns true of the window can be focused.
virtual bool CanFocus() = 0;
// Invoked when mouse capture is lost on the window.
virtual void OnCaptureLost() = 0;
// Asks the delegate to paint window contents into the supplied context.
virtual void OnPaint(const ui::PaintContext& context) = 0;
// Called when the window's device scale factor has changed.
virtual void OnDeviceScaleFactorChanged(float old_device_scale_factor,
float new_device_scale_factor) = 0;
// Called from Window's destructor before OnWindowDestroyed and before the
// children have been destroyed and the window has been removed from its
// parent.
// This method takes the window because the delegate implementation may no
// longer have a route back to the window by the time this method is called.
virtual void OnWindowDestroying(Window* window) = 0;
// Called when the Window has been destroyed (i.e. from its destructor). This
// is called after OnWindowDestroying and after the children have been
// deleted and the window has been removed from its parent.
// The delegate can use this as an opportunity to delete itself if necessary.
// This method takes the window because the delegate implementation may no
// longer have a route back to the window by the time this method is called.
virtual void OnWindowDestroyed(Window* window) = 0;
// Called when the TargetVisibility() of a Window changes. |visible|
// corresponds to the target visibility of the window. See
// Window::TargetVisibility() for details.
virtual void OnWindowTargetVisibilityChanged(bool visible) = 0;
// Called when the occlusion state or occluded region of the Window changes
// while tracked (see WindowOcclusionTracker::Track). |occlusion_state| is
// the new occlusion state of the Window. |occluded_region| is the new
// occluded region of the Window.
virtual void OnWindowOcclusionChanged(Window::OcclusionState occlusion_state,
const SkRegion& occluded_region) {}
// Called from Window::HitTest to check if the window has a custom hit test
// mask. It works similar to the views counterparts. That is, if the function
// returns true, GetHitTestMask below will be called to get the mask.
// Otherwise, Window will hit-test against its bounds.
virtual bool HasHitTestMask() const = 0;
// Called from Window::HitTest to retrieve hit test mask when HasHitTestMask
// above returns true.
virtual void GetHitTestMask(SkPath* mask) const = 0;
// Returns whether the window wants to receive and handle double tap gesture
// events. Defaults to false.
virtual bool RequiresDoubleTapGestureEvents() const;
// See LayerDelegate::UpdateVisualState() for details.
virtual void UpdateVisualState() {}
protected:
~WindowDelegate() override {}
};
} // namespace aura
#endif // UI_AURA_WINDOW_DELEGATE_H_
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