aura: Track mouse button state.

ui/aura/desktop_unittest.cc

Index: ui/aura/desktop_unittest.cc
diff --git a/ui/aura/desktop_unittest.cc b/ui/aura/desktop_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cac63dbffa230a1580a9aaf9fcbf29010e0224a9
--- /dev/null
+++ b/ui/aura/desktop_unittest.cc
@@ -0,0 +1,68 @@
+// Copyright (c) 2011 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 "ui/aura/desktop.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/aura/event.h"
+#include "ui/aura/test/aura_test_base.h"
+#include "ui/aura/test/event_generator.h"
+
+namespace aura {
+namespace test {
+
+typedef AuraTestBase DesktopTest;
+
+// Check that we correctly track the state of the mouse buttons in response to
+// button press and release events.
+TEST_F(DesktopTest, MouseButtonState) {
+  Desktop* desktop = Desktop::GetInstance();
+  EXPECT_FALSE(desktop->IsMouseButtonDown());
+
+  gfx::Point location;
+  scoped_ptr<MouseEvent> event;
+
+  // Press the left button.
+  event.reset(new MouseEvent(
+      ui::ET_MOUSE_PRESSED,
+      location,
+      ui::EF_LEFT_BUTTON_DOWN));
+  desktop->DispatchMouseEvent(event.get());
+  EXPECT_TRUE(desktop->IsMouseButtonDown());
+
+  // Additionally press the right.
+  event.reset(new MouseEvent(
+      ui::ET_MOUSE_PRESSED,
+      location,
+      ui::EF_LEFT_BUTTON_DOWN | ui::EF_RIGHT_BUTTON_DOWN));
+  desktop->DispatchMouseEvent(event.get());
+  EXPECT_TRUE(desktop->IsMouseButtonDown());
+
+  // Release the left button.
+  event.reset(new MouseEvent(
+      ui::ET_MOUSE_RELEASED,
+      location,
+      ui::EF_RIGHT_BUTTON_DOWN));
+  desktop->DispatchMouseEvent(event.get());
+  EXPECT_TRUE(desktop->IsMouseButtonDown());
+
+  // Release the right button.  We should ignore the Shift-is-down flag.
+  event.reset(new MouseEvent(
+      ui::ET_MOUSE_RELEASED,
+      location,
+      ui::EF_SHIFT_DOWN));
+  desktop->DispatchMouseEvent(event.get());
+  EXPECT_FALSE(desktop->IsMouseButtonDown());
+
+  // Press the middle button.
+  event.reset(new MouseEvent(
+      ui::ET_MOUSE_PRESSED,
+      location,
+      ui::EF_MIDDLE_BUTTON_DOWN));
+  desktop->DispatchMouseEvent(event.get());
+  EXPECT_TRUE(desktop->IsMouseButtonDown());
+}
+
+}  // namespace test
+}  // namespace aura