Show wallpaper context menu in home launcher

Changes:
Show the context menu in home launcher in the same way as that in
wallpaper when the background is long-pressed or right clicked.

BUG=832993

Change-Id: I5f2d769884b2313a8a32254522428a73e13b9665
Reviewed-on: https://chromium-review.googlesource.com/1024728
Commit-Queue: Weidong Guo <weidongg@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553371}

ash/app_list/app_list_presenter_delegate_unittest.cc

@@ -12,6 +12,7 @@
 #include "ash/public/cpp/shelf_model.h"
 #include "ash/public/cpp/shelf_types.h"
 #include "ash/public/cpp/shell_window_ids.h"
+#include "ash/root_window_controller.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_controller.h"
 #include "ash/shelf/shelf_layout_manager.h"
@@ -20,6 +21,7 @@
 #include "ash/shell_port.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/overview/window_selector_controller.h"
+#include "ash/wm/root_window_finder.h"
 #include "ash/wm/splitview/split_view_controller.h"
 #include "ash/wm/tablet_mode/tablet_mode_controller.h"
 #include "ash/wm/window_state.h"
@@ -1289,4 +1291,45 @@ TEST_F(AppListPresenterDelegateHomeLauncherTest, AppListButtonEndOverViewMode) {
   GetAppListTestHelper()->CheckVisibility(true);
 }
 
+// Tests that the context menu is triggered in the same way as if we are on
+// the wallpaper.
+TEST_F(AppListPresenterDelegateHomeLauncherTest, WallpaperContextMenu) {
+  // Show app list in tablet mode.
+  EnableTabletMode(true);
+  GetAppListTestHelper()->CheckVisibility(true);
+
+  // Long press on the app list to open the context menu.
+  const gfx::Point onscreen_point(GetPointOutsideSearchbox());
+  ui::test::EventGenerator& generator = GetEventGenerator();
+  ui::GestureEvent long_press(
+      onscreen_point.x(), onscreen_point.y(), 0, base::TimeTicks(),
+      ui::GestureEventDetails(ui::ET_GESTURE_LONG_PRESS));
+  generator.Dispatch(&long_press);
+  GetAppListTestHelper()->WaitUntilIdle();
+  const aura::Window* root = wm::GetRootWindowAt(onscreen_point);
+  const RootWindowController* root_window_controller =
+      RootWindowController::ForWindow(root);
+  EXPECT_TRUE(root_window_controller->IsContextMenuShown());
+
+  // Tap down to close the context menu.
+  ui::GestureEvent tap_down(onscreen_point.x(), onscreen_point.y(), 0,
+                            base::TimeTicks(),
+                            ui::GestureEventDetails(ui::ET_GESTURE_TAP_DOWN));
+  generator.Dispatch(&tap_down);
+  GetAppListTestHelper()->WaitUntilIdle();
+  EXPECT_FALSE(root_window_controller->IsContextMenuShown());
+
+  // Right click to open the context menu.
+  generator.MoveMouseTo(onscreen_point);
+  generator.PressRightButton();
+  GetAppListTestHelper()->WaitUntilIdle();
+  EXPECT_TRUE(root_window_controller->IsContextMenuShown());
+
+  // Left click to close the context menu.
+  generator.MoveMouseTo(onscreen_point);
+  generator.PressLeftButton();
+  GetAppListTestHelper()->WaitUntilIdle();
+  EXPECT_FALSE(root_window_controller->IsContextMenuShown());
+}
+
 }  // namespace ash

ash/app_list/app_list_view_delegate_mash.cc

@@ -10,6 +10,7 @@
 #include "ash/app_list/model/app_list_model.h"
 #include "ash/app_list/model/search/search_model.h"
 #include "ash/shell.h"
+#include "ash/shell_port.h"
 #include "ash/wallpaper/wallpaper_controller.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/user_metrics.h"
@@ -114,4 +115,10 @@ void AppListViewDelegateMash::RemoveObserver(
   observers_.RemoveObserver(observer);
 }
 
+void AppListViewDelegateMash::ShowWallpaperContextMenu(
+    const gfx::Point& onscreen_location,
+    ui::MenuSourceType source_type) {
+  ShellPort::Get()->ShowContextMenu(onscreen_location, source_type);
+}
+
 }  // namespace ash

ash/app_list/app_list_view_delegate_mash.h

@@ -50,6 +50,9 @@ class ASH_EXPORT AppListViewDelegateMash
   void AddObserver(app_list::AppListViewDelegateObserver* observer) override;
   void RemoveObserver(app_list::AppListViewDelegateObserver* observer) override;
 
+  void ShowWallpaperContextMenu(const gfx::Point& onscreen_location,
+                                ui::MenuSourceType source_type) override;
+
  private:
   ash::AppListControllerImpl* owner_;
   base::string16 last_raw_query_;

ash/root_window_controller.cc

@@ -639,6 +639,10 @@ void RootWindowController::HideContextMenu() {
     menu_runner_->Cancel();
 }
 
+bool RootWindowController::IsContextMenuShown() const {
+  return menu_runner_ && menu_runner_->IsRunning();
+}
+
 void RootWindowController::UpdateAfterLoginStatusChange(LoginStatus status) {
   StatusAreaWidget* status_area_widget =
       shelf_->shelf_widget()->status_area_widget();

ash/root_window_controller.h

@@ -231,6 +231,7 @@ class ASH_EXPORT RootWindowController {
   void ShowContextMenu(const gfx::Point& location_in_screen,
                        ui::MenuSourceType source_type);
   void HideContextMenu();
+  bool IsContextMenuShown() const;
 
   // Called when the login status changes after login (such as lock/unlock).
   void UpdateAfterLoginStatusChange(LoginStatus status);

ash/shell/app_list.cc

@@ -305,6 +305,11 @@ class ExampleAppListViewDelegate : public app_list::AppListViewDelegate {
     NOTIMPLEMENTED();
   }
 
+  void ShowWallpaperContextMenu(const gfx::Point& onscreen_location,
+                                ui::MenuSourceType source_type) override {
+    NOTIMPLEMENTED();
+  }
+
   std::unique_ptr<app_list::AppListModel> model_;
   std::unique_ptr<app_list::SearchModel> search_model_;
 

ui/app_list/app_list_view_delegate.h

@@ -14,6 +14,8 @@
 #include "base/time/time.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/app_list/app_list_export.h"
+#include "ui/base/ui_base_types.h"
+#include "ui/gfx/geometry/point.h"
 
 namespace gfx {
 class Size;
@@ -96,6 +98,10 @@ class APP_LIST_EXPORT AppListViewDelegate {
   // Add/remove observer for AppListViewDelegate.
   virtual void AddObserver(AppListViewDelegateObserver* observer) = 0;
   virtual void RemoveObserver(AppListViewDelegateObserver* observer) = 0;
+
+  // Show wallpaper context menu from the specified onscreen location.
+  virtual void ShowWallpaperContextMenu(const gfx::Point& onscreen_location,
+                                        ui::MenuSourceType source_type) = 0;
 };
 
 }  // namespace app_list

ui/app_list/test/app_list_test_view_delegate.h

@@ -65,6 +65,8 @@ class AppListTestViewDelegate : public AppListViewDelegate {
   void AddObserver(app_list::AppListViewDelegateObserver* observer) override {}
   void RemoveObserver(
       app_list::AppListViewDelegateObserver* observer) override {}
+  void ShowWallpaperContextMenu(const gfx::Point& onscreen_location,
+                                ui::MenuSourceType source_type) override {}
 
   // Do a bulk replacement of the items in the model.
   void ReplaceTestModel(int item_count);

ui/app_list/views/app_list_view.cc

@@ -553,11 +553,22 @@ void AppListView::HandleClickOrTap(ui::LocatedEvent* event) {
     return;
   }
 
-  // No-op if the event was a right-click or two-finger tap.
   if ((event->IsGestureEvent() &&
-       event->AsGestureEvent()->type() == ui::ET_GESTURE_TWO_FINGER_TAP) ||
+       (event->AsGestureEvent()->type() == ui::ET_GESTURE_LONG_PRESS ||
+        event->AsGestureEvent()->type() == ui::ET_GESTURE_LONG_TAP ||
+        event->AsGestureEvent()->type() == ui::ET_GESTURE_TWO_FINGER_TAP)) ||
       (event->IsMouseEvent() &&
        event->AsMouseEvent()->IsOnlyRightMouseButton())) {
+    if (!IsHomeLauncherEnabledInTabletMode())
+      return;
+
+    // Home launcher is shown on top of wallpaper with trasparent background. So
+    // trigger the wallpaper context menu for the same events.
+    gfx::Point onscreen_location(event->location());
+    ConvertPointToScreen(this, &onscreen_location);
+    delegate_->ShowWallpaperContextMenu(
+        onscreen_location, event->IsGestureEvent() ? ui::MENU_SOURCE_TOUCH
+                                                   : ui::MENU_SOURCE_MOUSE);
     return;
   }
 
@@ -933,6 +944,9 @@ void AppListView::OnMouseEvent(ui::MouseEvent* event) {
 void AppListView::OnGestureEvent(ui::GestureEvent* event) {
   switch (event->type()) {
     case ui::ET_GESTURE_TAP:
+    case ui::ET_GESTURE_LONG_PRESS:
+    case ui::ET_GESTURE_LONG_TAP:
+    case ui::ET_GESTURE_TWO_FINGER_TAP:
       SetIsInDrag(false);
       event->SetHandled();
       HandleClickOrTap(event);