linux/x11: Fix event dispatch in menus in High DPI.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc
index aec6aa2968b23f500743fe3dbd11964aa150aca3..8fc6b74ad219fd7fbb08b2b43b7ec938e09b9f9e 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc
@@ -8,23 +8,30 @@
 #include <X11/Xlib.h>
 
 // Get rid of X11 macros which conflict with gtest.
+// It is necessary to include this header before the rest so that Bool can be
+// undefined.
+#include "ui/events/test/events_test_utils_x11.h"
 #undef Bool
 #undef None
 
+#include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/hit_test.h"
 #include "ui/base/x/x11_util.h"
+#include "ui/events/devices/x11/touch_factory_x11.h"
 #include "ui/events/platform/x11/x11_event_source.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/path.h"
+#include "ui/gfx/switches.h"
 #include "ui/gfx/x/x11_atom_cache.h"
 #include "ui/views/test/views_test_base.h"
 #include "ui/views/test/x11_property_change_waiter.h"
 #include "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"
+#include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 #include "ui/views/widget/widget_delegate.h"
 #include "ui/views/window/non_client_view.h"
 
@@ -32,6 +39,8 @@ namespace views {
 
 namespace {
 
+const int kPointerDeviceId = 1;
+
 // Blocks till the window state hint, |hint|, is set or unset.
 class WMStateWaiter : public X11PropertyChangeWaiter {
  public:
@@ -454,4 +463,137 @@ TEST_F(DesktopWindowTreeHostX11Test, ToggleMinimizePropogateToContentWindow) {
   EXPECT_TRUE(widget.GetNativeWindow()->IsVisible());
 }
 
+class MouseEventRecorder : public ui::EventHandler {
+ public:
+  MouseEventRecorder() {}
+  ~MouseEventRecorder() override {}
+
+  void Reset() { mouse_events_.clear(); }
+
+  const std::vector<ui::MouseEvent>& mouse_events() const {
+    return mouse_events_;
+  }
+
+ private:
+  // ui::EventHandler:
+  void OnMouseEvent(ui::MouseEvent* mouse) override {
+    mouse_events_.push_back(*mouse);
+  }
+
+  std::vector<ui::MouseEvent> mouse_events_;
+
+  DISALLOW_COPY_AND_ASSIGN(MouseEventRecorder);
+};
+
+// A custom event-source that can be used to directly dispatch synthetic X11
+// events.
+class CustomX11EventSource : public ui::X11EventSource {
+ public:
+  CustomX11EventSource() : X11EventSource(gfx::GetXDisplay()) {}
+  ~CustomX11EventSource() override {}
+
+  void DispatchSingleEvent(XEvent* xevent) {
+    PlatformEventSource::DispatchEvent(xevent);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CustomX11EventSource);
+};
+
+class DesktopWindowTreeHostX11HighDPITest
+    : public DesktopWindowTreeHostX11Test {
+ public:
+  DesktopWindowTreeHostX11HighDPITest() {}
+  ~DesktopWindowTreeHostX11HighDPITest() override {}
+
+  void DispatchSingleEventToWidget(XEvent* event, Widget* widget) {
+    DCHECK_EQ(GenericEvent, event->type);
+    XIDeviceEvent* device_event =
+        static_cast<XIDeviceEvent*>(event->xcookie.data);
+    device_event->event =
+        widget->GetNativeWindow()->GetHost()->GetAcceleratedWidget();
+    event_source_.DispatchSingleEvent(event);
+  }
+
+  void PretendCapture(views::Widget* capture_widget) {
+    DesktopWindowTreeHostX11* capture_host = nullptr;
+    if (capture_widget) {
+      capture_host = static_cast<DesktopWindowTreeHostX11*>(
+          capture_widget->GetNativeWindow()->GetHost());
+    }
+    DesktopWindowTreeHostX11::g_current_capture = capture_host;
+    if (capture_widget)
+      capture_widget->GetNativeWindow()->SetCapture();
+  }
+
+ private:
+  void SetUp() override {
+    base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+    command_line->AppendSwitchASCII(switches::kForceDeviceScaleFactor, "2");
+    std::vector<unsigned int> pointer_devices;
+    pointer_devices.push_back(kPointerDeviceId);
+    ui::TouchFactory::GetInstance()->SetPointerDeviceForTest(pointer_devices);
+
+    DesktopWindowTreeHostX11Test::SetUp();
+  }
+
+  CustomX11EventSource event_source_;
+  DISALLOW_COPY_AND_ASSIGN(DesktopWindowTreeHostX11HighDPITest);
+};
+
+TEST_F(DesktopWindowTreeHostX11HighDPITest, LocatedEventDispatchWithCapture) {
+  Widget first;
+  Widget::InitParams params = CreateParams(Widget::InitParams::TYPE_WINDOW);
+  params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
+  params.native_widget = new DesktopNativeWidgetAura(&first);
+  params.bounds = gfx::Rect(0, 0, 50, 50);
+  first.Init(params);
+  first.Show();
+
+  Widget second;
+  params = CreateParams(Widget::InitParams::TYPE_WINDOW);
+  params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
+  params.native_widget = new DesktopNativeWidgetAura(&second);
+  params.bounds = gfx::Rect(50, 50, 50, 50);
+  second.Init(params);
+  second.Show();
+
+  ui::X11EventSource::GetInstance()->DispatchXEvents();
+
+  MouseEventRecorder first_recorder, second_recorder;
+  first.GetNativeWindow()->AddPreTargetHandler(&first_recorder);
+  second.GetNativeWindow()->AddPreTargetHandler(&second_recorder);
+
+  // Dispatch an event on |first|. Verify it gets the event.
+  ui::ScopedXI2Event event;
+  event.InitGenericButtonEvent(kPointerDeviceId, ui::ET_MOUSEWHEEL,
+                               gfx::Point(50, 50), ui::EF_NONE);
+  DispatchSingleEventToWidget(event, &first);
+  ASSERT_EQ(1u, first_recorder.mouse_events().size());
+  EXPECT_EQ(ui::ET_MOUSEWHEEL, first_recorder.mouse_events()[0].type());
+  EXPECT_EQ(gfx::Point(25, 25).ToString(),
+            first_recorder.mouse_events()[0].location().ToString());
+  ASSERT_EQ(0u, second_recorder.mouse_events().size());
+
+  first_recorder.Reset();
+  second_recorder.Reset();
+
+  // Set a capture on |second|, and dispatch the same event to |first|. This
+  // event should reach |second| instead.
+  PretendCapture(&second);
+  event.InitGenericButtonEvent(kPointerDeviceId, ui::ET_MOUSEWHEEL,
+                               gfx::Point(50, 50), ui::EF_NONE);
+  DispatchSingleEventToWidget(event, &first);
+
+  ASSERT_EQ(0u, first_recorder.mouse_events().size());
+  ASSERT_EQ(1u, second_recorder.mouse_events().size());
+  EXPECT_EQ(ui::ET_MOUSEWHEEL, second_recorder.mouse_events()[0].type());
+  EXPECT_EQ(gfx::Point(-25, -25).ToString(),
+            second_recorder.mouse_events()[0].location().ToString());
+
+  PretendCapture(nullptr);
+  first.GetNativeWindow()->RemovePreTargetHandler(&first_recorder);
+  second.GetNativeWindow()->RemovePreTargetHandler(&second_recorder);
+}
+
 }  // namespace views