[Android] Perform haptic feedback after long press when appropriate

Tentatively trigger haptic feedback when ContentViewCore is directed to show the
the paste popup. While there are no guarantees that such a commend was triggered
by a long press gesture, it should still be a usability improvement. Also
trigger feedback when the selection is updated via a repeated long press gesture.

BUG=150151,399619

Review URL: https://codereview.chromium.org/467303002

Cr-Commit-Position: refs/heads/master@{#290107}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290107 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/android/content_view_core_impl.cc

@@ -620,7 +620,7 @@ void ContentViewCoreImpl::ShowPastePopup(int x_dip, int y_dip) {
   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
   if (obj.is_null())
     return;
-  Java_ContentViewCore_showPastePopup(env, obj.obj(),
+  Java_ContentViewCore_showPastePopupWithFeedback(env, obj.obj(),
                                                   static_cast<jint>(x_dip),
                                                   static_cast<jint>(y_dip));
 }

content/browser/renderer_host/input/touch_selection_controller.cc

@@ -4,6 +4,7 @@
 
 #include "content/browser/renderer_host/input/touch_selection_controller.h"
 
+#include "base/auto_reset.h"
 #include "base/logging.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
@@ -12,7 +13,7 @@ namespace content {
 TouchSelectionController::TouchSelectionController(
     TouchSelectionControllerClient* client)
     : client_(client),
-      last_input_event_type_(INPUT_EVENT_TYPE_NONE),
+      response_pending_input_event_(INPUT_EVENT_TYPE_NONE),
       start_orientation_(TOUCH_HANDLE_ORIENTATION_UNDEFINED),
       start_visible_(false),
       end_orientation_(TOUCH_HANDLE_ORIENTATION_UNDEFINED),
@@ -38,8 +39,11 @@ void TouchSelectionController::OnSelectionBoundsChanged(
     const gfx::RectF& end_rect,
     TouchHandleOrientation end_orientation,
     bool end_visible) {
-  if (!activate_selection_automatically_ && !activate_insertion_automatically_)
+  if (!activate_selection_automatically_ &&
+      !activate_insertion_automatically_) {
+    DCHECK_EQ(INPUT_EVENT_TYPE_NONE, response_pending_input_event_);
     return;
+  }
 
   if (start_rect_ == start_rect && end_rect_ == end_rect &&
       start_orientation_ == start_orientation &&
@@ -54,6 +58,14 @@ void TouchSelectionController::OnSelectionBoundsChanged(
   end_orientation_ = end_orientation;
   end_visible_ = end_visible;
 
+  // Ensure that |response_pending_input_event_| is cleared after the method
+  // completes, while also making its current value available for the duration
+  // of the call.
+  InputEventType causal_input_event = response_pending_input_event_;
+  response_pending_input_event_ = INPUT_EVENT_TYPE_NONE;
+  base::AutoReset<InputEventType> auto_reset_response_pending_input_event(
+      &response_pending_input_event_, causal_input_event);
+
   const bool is_selection_dragging =
       is_selection_active_ && (start_selection_handle_->is_dragging() ||
                                end_selection_handle_->is_dragging());
@@ -117,14 +129,14 @@ bool TouchSelectionController::WillHandleTouchEvent(
 }
 
 void TouchSelectionController::OnLongPressEvent() {
-  last_input_event_type_ = LONG_PRESS;
+  response_pending_input_event_ = LONG_PRESS;
   ShowSelectionHandlesAutomatically();
   ShowInsertionHandleAutomatically();
   ResetCachedValuesIfInactive();
 }
 
 void TouchSelectionController::OnTapEvent() {
-  last_input_event_type_ = TAP;
+  response_pending_input_event_ = TAP;
   activate_selection_automatically_ = false;
   DeactivateSelection();
   ShowInsertionHandleAutomatically();
@@ -132,7 +144,7 @@ void TouchSelectionController::OnTapEvent() {
 }
 
 void TouchSelectionController::HideAndDisallowShowingAutomatically() {
-  last_input_event_type_ = INPUT_EVENT_TYPE_NONE;
+  response_pending_input_event_ = INPUT_EVENT_TYPE_NONE;
   DeactivateInsertion();
   DeactivateSelection();
   activate_insertion_automatically_ = false;
@@ -248,7 +260,7 @@ void TouchSelectionController::ShowSelectionHandlesAutomatically() {
 void TouchSelectionController::OnInsertionChanged() {
   DeactivateSelection();
 
-  if (last_input_event_type_ == TAP && selection_empty_) {
+  if (response_pending_input_event_ == TAP && selection_empty_) {
     HideAndDisallowShowingAutomatically();
     return;
   }
@@ -324,8 +336,12 @@ void TouchSelectionController::ActivateSelection() {
     end_selection_handle_->SetOrientation(end_orientation_);
   }
 
-  if (!is_selection_active_) {
+  // As a long press received while a selection is already active may trigger
+  // an entirely new selection, notify the client but avoid sending an
+  // intervening SELECTION_CLEARED update to avoid unnecessary state changes.
+  if (!is_selection_active_ || response_pending_input_event_ == LONG_PRESS) {
     is_selection_active_ = true;
+    response_pending_input_event_ = INPUT_EVENT_TYPE_NONE;
     client_->OnSelectionEvent(SELECTION_SHOWN, GetStartPosition());
   }
 }

content/browser/renderer_host/input/touch_selection_controller.h

@@ -117,7 +117,7 @@ class CONTENT_EXPORT TouchSelectionController : public TouchHandleClient {
 
   TouchSelectionControllerClient* const client_;
 
-  InputEventType last_input_event_type_;
+  InputEventType response_pending_input_event_;
 
   gfx::RectF start_rect_;
   TouchHandleOrientation start_orientation_;

content/browser/renderer_host/input/touch_selection_controller_unittest.cc

@@ -478,6 +478,25 @@ TEST_F(TouchSelectionControllerTest, SelectionBasic) {
   EXPECT_EQ(gfx::PointF(), GetLastEventAnchor());
 }
 
+TEST_F(TouchSelectionControllerTest, SelectionRepeatedLongPress) {
+  gfx::RectF start_rect(5, 5, 0, 10);
+  gfx::RectF end_rect(50, 5, 0, 10);
+  bool visible = true;
+
+  controller().OnLongPressEvent();
+  ChangeSelection(start_rect, visible, end_rect, visible);
+  EXPECT_EQ(SELECTION_SHOWN, GetLastEventType());
+  EXPECT_EQ(start_rect.bottom_left(), GetLastEventAnchor());
+
+  // A long press triggering a new selection should re-send the SELECTION_SHOWN
+  // event notification.
+  start_rect.Offset(10, 10);
+  controller().OnLongPressEvent();
+  ChangeSelection(start_rect, visible, end_rect, visible);
+  EXPECT_EQ(SELECTION_SHOWN, GetLastEventType());
+  EXPECT_EQ(start_rect.bottom_left(), GetLastEventAnchor());
+}
+
 TEST_F(TouchSelectionControllerTest, SelectionDragged) {
   base::TimeTicks event_time = base::TimeTicks::Now();
   controller().OnLongPressEvent();

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

@@ -2406,12 +2406,21 @@ public class ContentViewCore
 
     @SuppressWarnings("unused")
     @CalledByNative
-    private void showPastePopup(int xDip, int yDip) {
-        if (!mHasInsertion || !canPaste()) return;
+    private void showPastePopupWithFeedback(int xDip, int yDip) {
+        // TODO(jdduke): Remove this when there is a better signal that long press caused
+        // showing of the paste popup. See http://crbug.com/150151.
+        if (showPastePopup(xDip, yDip)) {
+            mContainerView.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
+        }
+    }
+
+    private boolean showPastePopup(int xDip, int yDip) {
+        if (!mHasInsertion || !canPaste()) return false;
         final float contentOffsetYPix = mRenderCoordinates.getContentOffsetYPix();
         getPastePopup().showAt(
             (int) mRenderCoordinates.fromDipToPix(xDip),
             (int) (mRenderCoordinates.fromDipToPix(yDip) + contentOffsetYPix));
+        return true;
     }
 
     private PastePopupMenu getPastePopup() {