| // Copyright 2014 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/views/widget/root_view_targeter.h" |
| |
| #include "ui/views/view.h" |
| #include "ui/views/view_targeter_delegate.h" |
| #include "ui/views/views_switches.h" |
| #include "ui/views/widget/root_view.h" |
| #include "ui/views/widget/widget.h" |
| |
| namespace views { |
| |
| RootViewTargeter::RootViewTargeter(ViewTargeterDelegate* delegate, |
| internal::RootView* root_view) |
| : ViewTargeter(delegate), root_view_(root_view) { |
| } |
| |
| RootViewTargeter::~RootViewTargeter() = default; |
| |
| View* RootViewTargeter::FindTargetForGestureEvent( |
| View* root, |
| const ui::GestureEvent& gesture) { |
| CHECK_EQ(root, root_view_); |
| |
| // Return the default gesture handler if one is already set. |
| if (root_view_->gesture_handler_) { |
| CHECK(root_view_->gesture_handler_set_before_processing_); |
| return root_view_->gesture_handler_; |
| } |
| |
| // If non-empty, use the gesture's bounding box to determine the target. |
| // Otherwise use the center point of the gesture's bounding box. |
| gfx::Rect rect(gesture.location(), gfx::Size(1, 1)); |
| if (!gesture.details().bounding_box().IsEmpty()) { |
| // TODO(tdanderson): Pass in the bounding box to GetEventHandlerForRect() |
| // once crbug.com/313392 is resolved. |
| rect.set_size(gesture.details().bounding_box().size()); |
| rect.Offset(-rect.width() / 2, -rect.height() / 2); |
| } |
| |
| return root->GetEffectiveViewTargeter()->TargetForRect(root, rect); |
| } |
| |
| ui::EventTarget* RootViewTargeter::FindNextBestTargetForGestureEvent( |
| ui::EventTarget* previous_target, |
| const ui::GestureEvent& gesture) { |
| // ET_GESTURE_END events should only ever be targeted to the default |
| // gesture handler set by a previous gesture, if one exists. Thus we do not |
| // permit any re-targeting of ET_GESTURE_END events. |
| if (gesture.type() == ui::ET_GESTURE_END) |
| return nullptr; |
| |
| // Prohibit re-targeting of gesture events (except for GESTURE_SCROLL_BEGIN |
| // events) if the default gesture handler was set by the dispatch of a |
| // previous gesture event. |
| if (root_view_->gesture_handler_set_before_processing_ && |
| gesture.type() != ui::ET_GESTURE_SCROLL_BEGIN) { |
| return nullptr; |
| } |
| |
| // If |gesture_handler_| is NULL, it is either because the view was removed |
| // from the tree by the previous dispatch of |gesture| or because |gesture| is |
| // the GESTURE_END event corresponding to the removal of the last touch |
| // point. In either case, no further re-targeting of |gesture| should be |
| // permitted. |
| if (!root_view_->gesture_handler_) |
| return nullptr; |
| |
| return previous_target->GetParentTarget(); |
| } |
| |
| } // namespace views |