mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
106 lines
3.9 KiB
C++
106 lines
3.9 KiB
C++
// Copyright 2014 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 MOJO_SERVICES_VIEW_MANAGER_CPP_VIEW_OBSERVER_H_
|
|
#define MOJO_SERVICES_VIEW_MANAGER_CPP_VIEW_OBSERVER_H_
|
|
|
|
#include <vector>
|
|
|
|
#include "input_events/interfaces/input_events.mojom.h"
|
|
#include "view_manager/cpp/view.h"
|
|
|
|
namespace mojo {
|
|
|
|
class View;
|
|
|
|
// A note on -ing and -ed suffixes:
|
|
//
|
|
// -ing methods are called before changes are applied to the local view model.
|
|
// -ed methods are called after changes are applied to the local view model.
|
|
//
|
|
// If the change originated from another connection to the view manager, it's
|
|
// possible that the change has already been applied to the service-side model
|
|
// prior to being called, so for example in the case of OnViewDestroying(), it's
|
|
// possible the view has already been destroyed on the service side.
|
|
|
|
class ViewObserver {
|
|
public:
|
|
struct TreeChangeParams {
|
|
TreeChangeParams();
|
|
View* target;
|
|
View* old_parent;
|
|
View* new_parent;
|
|
View* receiver;
|
|
};
|
|
|
|
virtual void OnTreeChanging(const TreeChangeParams& params) {}
|
|
virtual void OnTreeChanged(const TreeChangeParams& params) {}
|
|
|
|
virtual void OnViewReordering(View* view,
|
|
View* relative_view,
|
|
OrderDirection direction) {}
|
|
virtual void OnViewReordered(View* view,
|
|
View* relative_view,
|
|
OrderDirection direction) {}
|
|
|
|
virtual void OnViewDestroying(View* view) {}
|
|
virtual void OnViewDestroyed(View* view) {}
|
|
|
|
virtual void OnViewBoundsChanging(View* view,
|
|
const Rect& old_bounds,
|
|
const Rect& new_bounds) {}
|
|
virtual void OnViewBoundsChanged(View* view,
|
|
const Rect& old_bounds,
|
|
const Rect& new_bounds) {}
|
|
|
|
virtual void OnViewViewportMetricsChanged(View* view,
|
|
const ViewportMetrics& old_bounds,
|
|
const ViewportMetrics& new_bounds) {
|
|
}
|
|
|
|
virtual void OnViewCaptureChanged(View* gained_capture, View* lost_capture) {}
|
|
virtual void OnViewFocusChanged(View* gained_focus, View* lost_focus) {}
|
|
virtual void OnViewActivationChanged(View* gained_active, View* lost_active) {
|
|
}
|
|
|
|
virtual void OnViewInputEvent(View* view, const EventPtr& event) {}
|
|
|
|
virtual void OnViewVisibilityChanging(View* view) {}
|
|
virtual void OnViewVisibilityChanged(View* view) {}
|
|
|
|
// Invoked when this View's shared properties have changed. This can either
|
|
// be caused by SetSharedProperty() being called locally, or by us receiving
|
|
// a mojo message that this property has changed. If this property has been
|
|
// added, |old_data| is null. If this property was removed, |new_data| is
|
|
// null.
|
|
virtual void OnViewSharedPropertyChanged(
|
|
View* view,
|
|
const std::string& name,
|
|
const std::vector<uint8_t>* old_data,
|
|
const std::vector<uint8_t>* new_data) {}
|
|
|
|
// Invoked when SetProperty() or ClearProperty() is called on the window.
|
|
// |key| is either a WindowProperty<T>* (SetProperty, ClearProperty). Either
|
|
// way, it can simply be compared for equality with the property
|
|
// constant. |old| is the old property value, which must be cast to the
|
|
// appropriate type before use.
|
|
virtual void OnViewLocalPropertyChanged(View* view,
|
|
const void* key,
|
|
intptr_t old) {}
|
|
|
|
virtual void OnViewEmbeddedAppDisconnected(View* view) {}
|
|
|
|
// Sent when the drawn state changes. This is only sent for the root nodes
|
|
// when embedded.
|
|
virtual void OnViewDrawnChanging(View* view) {}
|
|
virtual void OnViewDrawnChanged(View* view) {}
|
|
|
|
protected:
|
|
virtual ~ViewObserver() {}
|
|
};
|
|
|
|
} // namespace mojo
|
|
|
|
#endif // MOJO_SERVICES_VIEW_MANAGER_CPP_VIEW_OBSERVER_H_
|