Support Drag and Drop across displays.

This CL introduces DragDropTracker, which
- Makes a dummy window capture events while dragging an item, and
- Dispatches mouse events to the window at the pointer location in DragDropController::PreHandleMouseEvent.

BUG=136817


Review URL: https://chromiumcodereview.appspot.com/10855159

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@153401 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 212 insertions, 0 deletions

diff --git a/ash/drag_drop/drag_drop_tracker_unittest.cc b/ash/drag_drop/drag_drop_tracker_unittest.cc
new file mode 100644
index 0000000..ddc75ba
--- /dev/null
+++ b/ash/drag_drop/drag_drop_tracker_unittest.cc
@@ -0,0 +1,212 @@
+// 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 "ash/drag_drop/drag_drop_tracker.h"
+
+#include "ash/shell.h"
+#include "ash/shell_window_ids.h"
+#include "ash/test/ash_test_base.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/aura/root_window.h"
+#include "ui/aura/test/test_windows.h"
+#include "ui/aura/window.h"
+
+namespace ash {
+namespace test {
+
+class DragDropTrackerTest : public test::AshTestBase {
+ public:
+  virtual void SetUp() OVERRIDE {
+    AshTestBase::SetUp();
+    UpdateDisplay("0+0-200x200,0+201-200x200");
+  }
+
+  static aura::Window* CreateTestWindow(const gfx::Rect& bounds,
+                                        aura::Window* parent) {
+    static int window_id = 0;
+    return aura::test::CreateTestWindowWithDelegate(
+        new aura::test::TestWindowDelegate,
+        window_id++,
+        bounds,
+        parent);
+  }
+
+  static aura::Window* GetTarget(aura::RootWindow* root_window,
+                          const gfx::Point& location) {
+    scoped_ptr<internal::DragDropTracker> tracker(
+        new internal::DragDropTracker(root_window));
+    ui::MouseEvent e(ui::ET_MOUSE_DRAGGED,
+                     location,
+                     location,
+                     ui::EF_NONE);
+    aura::Window* target = tracker->GetTarget(e);
+    return target;
+  }
+
+  static ui::MouseEvent* ConvertMouseEvent(aura::RootWindow* root_window,
+                                           aura::Window* target,
+                                           const ui::MouseEvent& event) {
+    scoped_ptr<internal::DragDropTracker> tracker(
+        new internal::DragDropTracker(root_window));
+    ui::MouseEvent* converted = tracker->ConvertMouseEvent(target, event);
+    return converted;
+  }
+};
+
+// TODO(mazda): Remove this once ash/wm/coordinate_conversion.h supports
+// non-X11 platforms.
+#if defined(USE_X11)
+#define MAYBE_GetTarget GetTarget
+#else
+#define MAYBE_GetTarget DISABLED_GetTarget
+#endif
+
+TEST_F(DragDropTrackerTest, MAYBE_GetTarget) {
+  Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
+  EXPECT_EQ(2U, root_windows.size());
+
+  aura::Window* default_container0 =
+      ash::Shell::GetContainer(root_windows[0],
+                               ash::internal::kShellWindowId_DefaultContainer);
+  EXPECT_TRUE(NULL != default_container0);
+
+  scoped_ptr<aura::Window> window0(
+      CreateTestWindow(gfx::Rect(0, 0, 100, 100), default_container0));
+  window0->Show();
+
+  aura::Window* default_container1 =
+      ash::Shell::GetContainer(root_windows[1],
+                               ash::internal::kShellWindowId_DefaultContainer);
+  EXPECT_TRUE(NULL != default_container1);
+
+  scoped_ptr<aura::Window> window1(
+      CreateTestWindow(gfx::Rect(100, 100, 100, 100), default_container1));
+  window1->Show();
+
+  // Start tracking from the RootWindow0 and check the point on RootWindow0 that
+  // |window0| covers.
+  EXPECT_EQ(window0.get(), GetTarget(root_windows[0], gfx::Point(50, 50)));
+
+  // Start tracking from the RootWindow0 and check the point on RootWindow0 that
+  // neither |window0| nor |window1| covers.
+  EXPECT_NE(window0.get(), GetTarget(root_windows[0], gfx::Point(150, 150)));
+  EXPECT_NE(window1.get(), GetTarget(root_windows[0], gfx::Point(150, 150)));
+
+  // Start tracking from the RootWindow0 and check the point on RootWindow1 that
+  // |window1| covers.
+  EXPECT_EQ(window1.get(), GetTarget(root_windows[0], gfx::Point(150, 350)));
+
+  // Start tracking from the RootWindow0 and check the point on RootWindow1 that
+  // neither |window0| nor |window1| covers.
+  EXPECT_NE(window0.get(), GetTarget(root_windows[0], gfx::Point(50, 250)));
+  EXPECT_NE(window1.get(), GetTarget(root_windows[0], gfx::Point(50, 250)));
+
+  // Start tracking from the RootWindow1 and check the point on RootWindow0 that
+  // |window0| covers.
+  EXPECT_EQ(window0.get(), GetTarget(root_windows[1], gfx::Point(50, -150)));
+
+  // Start tracking from the RootWindow1 and check the point on RootWindow0 that
+  // neither |window0| nor |window1| covers.
+  EXPECT_NE(window0.get(), GetTarget(root_windows[1], gfx::Point(150, -50)));
+  EXPECT_NE(window1.get(), GetTarget(root_windows[1], gfx::Point(150, -50)));
+
+  // Start tracking from the RootWindow1 and check the point on RootWindow1 that
+  // |window1| covers.
+  EXPECT_EQ(window1.get(), GetTarget(root_windows[1], gfx::Point(150, 150)));
+
+  // Start tracking from the RootWindow1 and check the point on RootWindow1 that
+  // neither |window0| nor |window1| covers.
+  EXPECT_NE(window0.get(), GetTarget(root_windows[1], gfx::Point(50, 50)));
+  EXPECT_NE(window1.get(), GetTarget(root_windows[1], gfx::Point(50, 50)));
+}
+
+// TODO(mazda): Remove this once ash/wm/coordinate_conversion.h supports
+// non-X11 platforms.
+#if defined(USE_X11)
+#define MAYBE_ConvertMouseEvent ConvertMouseEvent
+#else
+#define MAYBE_ConvertMouseEvent DISABLED_ConvertMouseEvent
+#endif
+
+TEST_F(DragDropTrackerTest, MAYBE_ConvertMouseEvent) {
+  Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
+  EXPECT_EQ(2U, root_windows.size());
+
+  aura::Window* default_container0 =
+      ash::Shell::GetContainer(root_windows[0],
+                               ash::internal::kShellWindowId_DefaultContainer);
+  EXPECT_TRUE(NULL != default_container0);
+
+  scoped_ptr<aura::Window> window0(
+      CreateTestWindow(gfx::Rect(0, 0, 100, 100), default_container0));
+  window0->Show();
+
+  aura::Window* default_container1 =
+      ash::Shell::GetContainer(root_windows[1],
+                               ash::internal::kShellWindowId_DefaultContainer);
+  EXPECT_TRUE(NULL != default_container1);
+
+  scoped_ptr<aura::Window> window1(
+      CreateTestWindow(gfx::Rect(100, 100, 100, 100), default_container1));
+  window1->Show();
+
+  // Start tracking from the RootWindow0 and converts the mouse event into
+  // |window0|'s coodinates.
+  ui::MouseEvent original00(ui::ET_MOUSE_DRAGGED,
+                            gfx::Point(50, 50),
+                            gfx::Point(50, 50),
+                            ui::EF_NONE);
+  scoped_ptr<ui::MouseEvent> converted00(ConvertMouseEvent(root_windows[0],
+                                                           window0.get(),
+                                                           original00));
+  EXPECT_EQ(original00.type(), converted00->type());
+  EXPECT_EQ(gfx::Point(50, 50), converted00->location());
+  EXPECT_EQ(gfx::Point(50, 50), converted00->root_location());
+  EXPECT_EQ(original00.flags(), converted00->flags());
+
+  // Start tracking from the RootWindow0 and converts the mouse event into
+  // |window1|'s coodinates.
+  ui::MouseEvent original01(ui::ET_MOUSE_DRAGGED,
+                            gfx::Point(150, 350),
+                            gfx::Point(150, 350),
+                            ui::EF_NONE);
+  scoped_ptr<ui::MouseEvent> converted01(ConvertMouseEvent(root_windows[0],
+                                                           window1.get(),
+                                                           original01));
+  EXPECT_EQ(original01.type(), converted01->type());
+  EXPECT_EQ(gfx::Point(50, 50), converted01->location());
+  EXPECT_EQ(gfx::Point(150, 150), converted01->root_location());
+  EXPECT_EQ(original01.flags(), converted01->flags());
+
+  // Start tracking from the RootWindow1 and converts the mouse event into
+  // |window0|'s coodinates.
+  ui::MouseEvent original10(ui::ET_MOUSE_DRAGGED,
+                            gfx::Point(50, -150),
+                            gfx::Point(50, -150),
+                            ui::EF_NONE);
+  scoped_ptr<ui::MouseEvent> converted10(ConvertMouseEvent(root_windows[1],
+                                                           window0.get(),
+                                                           original10));
+  EXPECT_EQ(original10.type(), converted10->type());
+  EXPECT_EQ(gfx::Point(50, 50), converted10->location());
+  EXPECT_EQ(gfx::Point(50, 50), converted10->root_location());
+  EXPECT_EQ(original10.flags(), converted10->flags());
+
+  // Start tracking from the RootWindow1 and converts the mouse event into
+  // |window1|'s coodinates.
+  ui::MouseEvent original11(ui::ET_MOUSE_DRAGGED,
+                            gfx::Point(150, 150),
+                            gfx::Point(150, 150),
+                            ui::EF_NONE);
+  scoped_ptr<ui::MouseEvent> converted11(ConvertMouseEvent(root_windows[1],
+                                                           window1.get(),
+                                                           original11));
+  EXPECT_EQ(original11.type(), converted11->type());
+  EXPECT_EQ(gfx::Point(50, 50), converted11->location());
+  EXPECT_EQ(gfx::Point(150, 150), converted11->root_location());
+  EXPECT_EQ(original11.flags(), converted11->flags());
+}
+
+}  // namespace test
+}  // namespace aura