First shot at implementing drag&drop for Aura

ui/aura_shell/drag_drop_controller_unittest.cc

Index: ui/aura_shell/drag_drop_controller_unittest.cc
diff --git a/ui/aura_shell/drag_drop_controller_unittest.cc b/ui/aura_shell/drag_drop_controller_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a696feab97c0a6983dbad7a4a6aba1775251db08
--- /dev/null
+++ b/ui/aura_shell/drag_drop_controller_unittest.cc
@@ -0,0 +1,361 @@
+// 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_shell/drag_drop_controller.h"
+
+#include "base/location.h"
+#include "base/utf_string_conversions.h"
+#include "ui/aura/client/aura_constants.h"
+#include "ui/aura/desktop.h"
+#include "ui/aura/event.h"
+#include "ui/aura_shell/desktop_event_filter.h"
+#include "ui/aura_shell/test/aura_shell_test_base.h"
+#include "ui/base/dragdrop/os_exchange_data.h"
+#include "ui/base/dragdrop/drag_drop_types.h"
+#include "views/events/event.h"
+#include "views/view.h"
+#include "views/widget/widget.h"
+
+namespace aura_shell {
+namespace test {
+
+namespace {
+
+// A simple view that makes sure RunShellDrag is invoked on mouse drag.
+class DragTestView : public views::View {
+ public:
+  DragTestView() : views::View() {
+    Reset();
+  }
+
+  void Reset() {
+    num_drag_enters_ = 0;
+    num_drag_exits_ = 0;
+    num_drag_updates_ = 0;
+    num_drops_ = 0;
+    drag_done_received_ = false;
+  }
+
+  int num_drag_enters_;
+  int num_drag_exits_;
+  int num_drag_updates_;
+  int num_drops_;
+  bool drag_done_received_;
+
+ private:
+  // View overrides:
+  int GetDragOperations(const gfx::Point& press_pt) OVERRIDE {
+    return ui::DragDropTypes::DRAG_COPY;
+  }
+
+  void WriteDragData(const gfx::Point& p, OSExchangeData* data) OVERRIDE {
+    data->SetString(UTF8ToUTF16("I am being dragged"));
+  }
+
+  bool OnMousePressed(const views::MouseEvent& event) OVERRIDE {
+    return true;
+  }
+
+  bool GetDropFormats(int* formats,
+                      std::set<OSExchangeData::CustomFormat>* custom_formats) {
+    *formats = ui::OSExchangeData::STRING;
+    return true;
+  }
+
+  bool CanDrop(const OSExchangeData& data) OVERRIDE {
+    return true;
+  }
+
+  void OnDragEntered(const views::DropTargetEvent& event) OVERRIDE {
+    num_drag_enters_++;
+  }
+
+  int OnDragUpdated(const views::DropTargetEvent& event) OVERRIDE {
+    num_drag_updates_++;
+    return ui::DragDropTypes::DRAG_COPY;
+  }
+
+  void OnDragExited() OVERRIDE {
+    num_drag_exits_++;
+  }
+
+  int OnPerformDrop(const views::DropTargetEvent& event) OVERRIDE {
+    num_drops_++;
+    return ui::DragDropTypes::DRAG_COPY;
+  }
+
+  void OnDragDone() OVERRIDE {
+    drag_done_received_ = true;
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(DragTestView);
+};
+
+class TestDragDropController : public internal::DragDropController {
+ public:
+  TestDragDropController() : internal::DragDropController() {
+    Reset();
+  }
+
+  void Reset() {
+    drag_start_received_ = false;
+    num_drag_updates_ = 0;
+    drop_received_ = false;
+    drag_string_.clear();
+  }
+
+  bool drag_start_received_;
+  int num_drag_updates_;
+  bool drop_received_;
+  string16 drag_string_;
+
+ private:
+  void StartDragAndDrop(const ui::OSExchangeData& data,
+                        int operation) OVERRIDE {
+    DragDropController::StartDragAndDrop(data, operation);
+    drag_start_received_ = true;
+    data.GetString(&drag_string_);
+  }
+
+  void DragUpdate(aura::Window* target,
+                  const aura::MouseEvent& event) OVERRIDE {
+    DragDropController::DragUpdate(target, event);
+    num_drag_updates_++;
+  }
+
+  void Drop(aura::Window* target, const aura::MouseEvent& event) OVERRIDE {
+    DragDropController::Drop(target, event);
+    drop_received_ = true;
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(TestDragDropController);
+};
+
+views::Widget* CreateNewWidget() {
+  views::Widget* widget = new views::Widget;
+  views::Widget::InitParams params;
+  params.type = views::Widget::InitParams::TYPE_WINDOW_FRAMELESS;
+  params.accept_events = true;
+  params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
+  params.parent = aura::Desktop::GetInstance();
+  params.child = true;
+  widget->Init(params);
+  widget->Show();
+  return widget;
+}
+
+void AddViewToWidgetAndResize(views::Widget* widget, views::View* view) {
+  if (!widget->GetContentsView()) {
+    views::View* contents_view = new views::View;
+    widget->SetContentsView(contents_view);
+  }
+
+  views::View* contents_view = widget->GetContentsView();
+  contents_view->AddChildView(view);
+  view->SetBounds(contents_view->width(), 0, 100, 100);
+  gfx::Rect contents_view_bounds = contents_view->bounds();
+  contents_view_bounds = contents_view_bounds.Union(view->bounds());
+  contents_view->SetBoundsRect(contents_view_bounds);
+  widget->SetBounds(contents_view_bounds);
+}
+
+}  // namespace
+
+class DragDropControllerTest : public AuraShellTestBase {
+ public:
+  DragDropControllerTest() : AuraShellTestBase() {
+  }
+
+  virtual ~DragDropControllerTest() {
+    aura::Desktop::GetInstance()->SetProperty(aura::kDesktopDragDropClientKey,
+        NULL);
+  }
+
+  void SetUp() OVERRIDE {
+    AuraShellTestBase::SetUp();
+    // We delete the default drag drop controller and replace it with test.
+    delete static_cast<internal::DragDropController*>(
+        aura::Desktop::GetInstance()->GetProperty(
+            aura::kDesktopDragDropClientKey));
+    drag_drop_controller_ = new TestDragDropController;
+    drag_drop_controller_->set_should_block_during_drag_drop(false);
+    aura::Desktop::GetInstance()->SetProperty(aura::kDesktopDragDropClientKey,
+        drag_drop_controller_);
+  }
+
+  void TearDown() OVERRIDE {
+    delete drag_drop_controller_;
+    drag_drop_controller_ = NULL;
+    AuraShellTestBase::TearDown();
+  }
+
+  void UpdateDragData(ui::OSExchangeData* data) {
+    drag_drop_controller_->drag_data_ = data;
+  }
+
+ protected:
+  TestDragDropController* drag_drop_controller_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DragDropControllerTest);
+};
+
+TEST_F(DragDropControllerTest, DragDropInSingleViewTest) {
+  views::Widget* widget = CreateNewWidget();
+  DragTestView* drag_view = new DragTestView;
+  AddViewToWidgetAndResize(widget, drag_view);
+  gfx::Point point = gfx::Rect(drag_view->bounds()).CenterPoint();
+  ui::OSExchangeData data;
+  data.SetString(UTF8ToUTF16("I am being dragged"));
+
+  aura::MouseEvent event1(ui::ET_MOUSE_PRESSED, point, ui::EF_LEFT_BUTTON_DOWN);
+  aura::Desktop::GetInstance()->DispatchMouseEvent(&event1);
+
+  int num_drags = 17;
+  for (int i = 0; i < num_drags; ++i) {
+    // Because we are not doing a blocking drag and drop, the original
+    // OSDragExchangeData object is lost as soon as we return from the drag
+    // initiation in DragDropController::StartDragAndDrop(). Hence we set the
+    // drag_data_ to a fake drag data object that we created.
+    if (i > 0)
+      UpdateDragData(&data);
+    point.Offset(0, 1);
+    aura::MouseEvent drag_event(ui::ET_MOUSE_DRAGGED, point,
+        ui::EF_LEFT_BUTTON_DOWN);
+    aura::Desktop::GetInstance()->DispatchMouseEvent(&drag_event);
+  }
+
+  aura::MouseEvent event2(ui::ET_MOUSE_RELEASED, point, 0);
+  aura::Desktop::GetInstance()->DispatchMouseEvent(&event2);
+
+  EXPECT_TRUE(drag_drop_controller_->drag_start_received_);
+  EXPECT_EQ(num_drags - 1, drag_drop_controller_->num_drag_updates_);
+  EXPECT_TRUE(drag_drop_controller_->drop_received_);
+  EXPECT_EQ(UTF8ToUTF16("I am being dragged"),
+      drag_drop_controller_->drag_string_);
+
+  EXPECT_EQ(1, drag_view->num_drag_enters_);
+  EXPECT_EQ(num_drags - 1, drag_view->num_drag_updates_);
+  EXPECT_EQ(1, drag_view->num_drops_);
+  EXPECT_EQ(0, drag_view->num_drag_exits_);
+  EXPECT_TRUE(drag_view->drag_done_received_);
+  delete widget;
+}
+
+TEST_F(DragDropControllerTest, DragDropInMultipleViewsSingleWidgetTest) {
+  views::Widget* widget = CreateNewWidget();
+  DragTestView* drag_view1 = new DragTestView;
+  AddViewToWidgetAndResize(widget, drag_view1);
+  gfx::Point point = drag_view1->bounds().CenterPoint();
+  DragTestView* drag_view2 = new DragTestView;
+  AddViewToWidgetAndResize(widget, drag_view2);
+
+  ui::OSExchangeData data;
+  data.SetString(UTF8ToUTF16("I am being dragged"));
+
+  aura::MouseEvent event1(ui::ET_MOUSE_PRESSED, point, ui::EF_LEFT_BUTTON_DOWN);
+  aura::Desktop::GetInstance()->DispatchMouseEvent(&event1);
+
+  int num_drags = drag_view1->width();
+  for (int i = 0; i < num_drags; ++i) {
+    // Because we are not doing a blocking drag and drop, the original
+    // OSDragExchangeData object is lost as soon as we return from the drag
+    // initiation in DragDropController::StartDragAndDrop(). Hence we set the
+    // drag_data_ to a fake drag data object that we created.
+    if (i > 0)
+      UpdateDragData(&data);
+    point.Offset(1, 0);
+    aura::MouseEvent drag_event(ui::ET_MOUSE_DRAGGED, point,
+        ui::EF_LEFT_BUTTON_DOWN);
+    aura::Desktop::GetInstance()->DispatchMouseEvent(&drag_event);
+  }
+
+  aura::MouseEvent event2(ui::ET_MOUSE_RELEASED, point, 0);
+  aura::Desktop::GetInstance()->DispatchMouseEvent(&event2);
+
+  EXPECT_TRUE(drag_drop_controller_->drag_start_received_);
+  EXPECT_EQ(num_drags - 1, drag_drop_controller_->num_drag_updates_);
+  EXPECT_TRUE(drag_drop_controller_->drop_received_);
+  EXPECT_EQ(UTF8ToUTF16("I am being dragged"),
+      drag_drop_controller_->drag_string_);
+
+  EXPECT_EQ(1, drag_view1->num_drag_enters_);
+  int num_expected_updates = drag_view1->bounds().width() -
+      drag_view1->bounds().CenterPoint().x() - 2;
+  EXPECT_EQ(num_expected_updates, drag_view1->num_drag_updates_);
+  EXPECT_EQ(0, drag_view1->num_drops_);
+  EXPECT_EQ(1, drag_view1->num_drag_exits_);
+  EXPECT_TRUE(drag_view1->drag_done_received_);
+
+  EXPECT_EQ(1, drag_view2->num_drag_enters_);
+  num_expected_updates = num_drags - num_expected_updates - 1;
+  EXPECT_EQ(num_expected_updates, drag_view2->num_drag_updates_);
+  EXPECT_EQ(1, drag_view2->num_drops_);
+  EXPECT_EQ(0, drag_view2->num_drag_exits_);
+  EXPECT_FALSE(drag_view2->drag_done_received_);
+  delete widget;
+}
+
+TEST_F(DragDropControllerTest, DragDropInMultipleViewsMultipleWidgetsTest) {
+  views::Widget* widget1 = CreateNewWidget();
+  DragTestView* drag_view1 = new DragTestView;
+  AddViewToWidgetAndResize(widget1, drag_view1);
+  gfx::Point point = drag_view1->bounds().CenterPoint();
+  views::Widget* widget2 = CreateNewWidget();
+  DragTestView* drag_view2 = new DragTestView;
+  AddViewToWidgetAndResize(widget2, drag_view2);
+  gfx::Rect widget1_bounds = widget1->GetClientAreaScreenBounds();
+  gfx::Rect widget2_bounds = widget2->GetClientAreaScreenBounds();
+  widget2->SetBounds(gfx::Rect(widget1_bounds.width(), 0,
+      widget2_bounds.width(), widget2_bounds.height()));
+
+  ui::OSExchangeData data;
+  data.SetString(UTF8ToUTF16("I am being dragged"));
+
+  aura::MouseEvent event1(ui::ET_MOUSE_PRESSED, point, ui::EF_LEFT_BUTTON_DOWN);
+  aura::Desktop::GetInstance()->DispatchMouseEvent(&event1);
+
+  int num_drags = drag_view1->width();
+  for (int i = 0; i < num_drags; ++i) {
+    // Because we are not doing a blocking drag and drop, the original
+    // OSDragExchangeData object is lost as soon as we return from the drag
+    // initiation in DragDropController::StartDragAndDrop(). Hence we set the
+    // drag_data_ to a fake drag data object that we created.
+    if (i > 0)
+      UpdateDragData(&data);
+    point.Offset(1, 0);
+    aura::MouseEvent drag_event(ui::ET_MOUSE_DRAGGED, point,
+        ui::EF_LEFT_BUTTON_DOWN);
+    aura::Desktop::GetInstance()->DispatchMouseEvent(&drag_event);
+  }
+
+  aura::MouseEvent event2(ui::ET_MOUSE_RELEASED, point, 0);
+  aura::Desktop::GetInstance()->DispatchMouseEvent(&event2);
+
+  EXPECT_TRUE(drag_drop_controller_->drag_start_received_);
+  EXPECT_EQ(num_drags - 1, drag_drop_controller_->num_drag_updates_);
+  EXPECT_TRUE(drag_drop_controller_->drop_received_);
+  EXPECT_EQ(UTF8ToUTF16("I am being dragged"),
+      drag_drop_controller_->drag_string_);
+
+  EXPECT_EQ(1, drag_view1->num_drag_enters_);
+  int num_expected_updates = drag_view1->bounds().width() -
+      drag_view1->bounds().CenterPoint().x() - 2;
+  EXPECT_EQ(num_expected_updates, drag_view1->num_drag_updates_);
+  EXPECT_EQ(0, drag_view1->num_drops_);
+  EXPECT_EQ(1, drag_view1->num_drag_exits_);
+  EXPECT_TRUE(drag_view1->drag_done_received_);
+
+  EXPECT_EQ(1, drag_view2->num_drag_enters_);
+  num_expected_updates = num_drags - num_expected_updates - 2;
+  EXPECT_EQ(num_expected_updates, drag_view2->num_drag_updates_);
+  EXPECT_EQ(1, drag_view2->num_drops_);
+  EXPECT_EQ(0, drag_view2->num_drag_exits_);
+  EXPECT_FALSE(drag_view2->drag_done_received_);
+  delete widget1;
+  delete widget2;
+}
+
+}  // namespace test
+}  // namespace aura