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Unified Diff: ui/views/touch_event_watcher.h

Issue 2125663002: mus: Add watcher for all touch events. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Fix a comment Created 4 years, 5 months ago
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Index: ui/views/touch_event_watcher.h
diff --git a/ui/views/touch_event_watcher.h b/ui/views/touch_event_watcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..e1647de0dd068ee590df122390e82f494c1068d3
--- /dev/null
+++ b/ui/views/touch_event_watcher.h
@@ -0,0 +1,43 @@
+// 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_TOUCH_EVENT_WATCHER_H_
+#define UI_VIEWS_TOUCH_EVENT_WATCHER_H_
+
+#include "base/macros.h"
+#include "ui/views/views_export.h"
+
+namespace gfx {
+class Point;
+}
+
+namespace ui {
+class LocatedEvent;
+}
+
+namespace views {
+class Widget;
+
+// An interface for read-only observation of touch events (in particular, the
+// events cannot be marked as handled). Only touch pointer kind are supported.
+// The |target| is the top-level widget that will receive the event, if any.
+// 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.
+class VIEWS_EXPORT TouchEventWatcher {
+ public:
+ TouchEventWatcher() {}
+ virtual void OnTouchEventObserved(const ui::LocatedEvent& event,
+ Widget* target) = 0;
+
+ protected:
+ virtual ~TouchEventWatcher() {}
+
+ private:
+ DISALLOW_COPY_AND_ASSIGN(TouchEventWatcher);
+};
+
+} // namespace views
+
+#endif // UI_VIEWS_TOUCH_EVENT_WATCHER_H_
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