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// Copyright 2016 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_VIEWS_POINTER_WATCHER_H_
#define UI_VIEWS_POINTER_WATCHER_H_
#include "base/macros.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/views/views_export.h"
namespace gfx {
class Point;
}
namespace ui {
class PointerEvent;
}
namespace views {
// When a PointerWatcher is added the types of events desired is specified by
// way of PointerWatcherEventTypes.
enum class PointerWatcherEventTypes {
// The PointerWatcher is interested in press, release, capture and mouse
// wheel.
BASIC,
// The PointerWatcher is interested in BASIC events, as well as move
// events.
MOVES,
// The PointerWatcher is interested in MOVE events, as well as drag
// events.
DRAGS
};
// An interface for read-only observation of pointer events (in particular, the
// events cannot be marked as handled). Only certain event types are supported.
// The |target| is the native window that will receive the event, if any.
// To reduce IPC traffic from the window server, move events are not provided
// unless the app specifically requests them.
// NOTE: On mus this allows observation of events outside of windows owned
// by the current process, in which case the |target| will be null. On mus
// event.target() is always null.
// NOTE: Mouse capture change events are sent through OnPointerEventObserved and
// its |target| is always null.
// NOTE: |target| may or may not have an associated views::Widget that may not
// be a top-level Widget.
class VIEWS_EXPORT PointerWatcher {
public:
PointerWatcher() {}
virtual void OnPointerEventObserved(const ui::PointerEvent& event,
const gfx::Point& location_in_screen,
gfx::NativeView target) = 0;
protected:
virtual ~PointerWatcher() {}
private:
DISALLOW_COPY_AND_ASSIGN(PointerWatcher);
};
} // namespace views
#endif // UI_VIEWS_POINTER_WATCHER_H_
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