Require a mouse button release event before counting a press event as a new click.

ui/events/event_unittest.cc

 // 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.
 
 #include "base/memory/scoped_ptr.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/keycodes/dom4/keycode_converter.h"
 #include "ui/events/test/events_test_utils.h"
@@ skipping 80 matching lines @@
   EXPECT_FALSE(MouseEvent::IsRepeatedClickEvent(mouse_ev1, mouse_ev2));
 
   // Too long a time between clicks.
   test_ev1.set_location(gfx::Point(0, 0));
   test_ev2.set_location(gfx::Point(0, 0));
   test_ev1.set_time_stamp(start);
   test_ev2.set_time_stamp(later);
   EXPECT_FALSE(MouseEvent::IsRepeatedClickEvent(mouse_ev1, mouse_ev2));
 }
 
+// Tests that an event only increases the click count and gets marked as a
+// double click if a release event was seen for the previous click. This
+// prevents the same PRESSED event from being processed twice:
+// http://crbug.com/389162
+TEST(EventTest, DoubleClickRequiresRelease) {
+  const gfx::Point origin1(0, 0);
+  const gfx::Point origin2(100, 0);
+  scoped_ptr<MouseEvent> ev;
+
+  ev.reset(new MouseEvent(ET_MOUSE_PRESSED, origin1, origin1, 0, 0));
+  EXPECT_EQ(1, MouseEvent::GetRepeatCount(*ev));
+  ev.reset(new MouseEvent(ET_MOUSE_PRESSED, origin1, origin1, 0, 0));
+  EXPECT_EQ(1, MouseEvent::GetRepeatCount(*ev));
+
+  ev.reset(new MouseEvent(ET_MOUSE_PRESSED, origin2, origin2, 0, 0));
+  EXPECT_EQ(1, MouseEvent::GetRepeatCount(*ev));
+  ev.reset(new MouseEvent(ET_MOUSE_RELEASED, origin2, origin2, 0, 0));
+  EXPECT_EQ(1, MouseEvent::GetRepeatCount(*ev));
+  ev.reset(new MouseEvent(ET_MOUSE_PRESSED, origin2, origin2, 0, 0));
+  EXPECT_EQ(2, MouseEvent::GetRepeatCount(*ev));
+}
+
 TEST(EventTest, KeyEvent) {
   static const struct {
     KeyboardCode key_code;
     int flags;
     uint16 character;
   } kTestData[] = {
     { VKEY_A, 0, 'a' },
     { VKEY_A, EF_SHIFT_DOWN, 'A' },
     { VKEY_A, EF_CAPS_LOCK_DOWN, 'A' },
     { VKEY_A, EF_SHIFT_DOWN | EF_CAPS_LOCK_DOWN, 'a' },
@@ skipping 276 matching lines @@
   EXPECT_FALSE(key_a4_pressed.IsRepeat());
 
   KeyEvent key_a4_pressed_nonstandard_state(
       native_event_a_pressed_nonstandard_state, false);
   EXPECT_FALSE(key_a4_pressed_nonstandard_state.IsRepeat());
 #endif
 }
 #endif  // USE_X11 || OS_WIN
 
 }  // namespace ui