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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "ui/views/widget/root_view_targeter.h" | |
| 6 | |
| 7 #include "ui/views/view.h" | |
| 8 #include "ui/views/view_targeter_delegate.h" | |
| 9 #include "ui/views/views_switches.h" | |
| 10 #include "ui/views/widget/root_view.h" | |
| 11 #include "ui/views/widget/widget.h" | |
| 12 | |
| 13 namespace views { | |
| 14 | |
| 15 RootViewTargeter::RootViewTargeter(ViewTargeterDelegate* delegate, | |
| 16 internal::RootView* root_view) | |
| 17 : ViewTargeter(delegate), root_view_(root_view) { | |
| 18 } | |
| 19 | |
| 20 RootViewTargeter::~RootViewTargeter() { | |
| 21 } | |
| 22 | |
| 23 View* RootViewTargeter::FindTargetForGestureEvent( | |
| 24 View* root, | |
| 25 const ui::GestureEvent& gesture) { | |
| 26 CHECK_EQ(root, root_view_); | |
| 27 | |
| 28 // Return the default gesture handler if one is already set. | |
| 29 if (root_view_->gesture_handler_) { | |
| 30 CHECK(root_view_->gesture_handler_set_before_processing_); | |
| 31 return root_view_->gesture_handler_; | |
| 32 } | |
| 33 | |
| 34 // If rect-based targeting is enabled, use the gesture's bounding box to | |
| 35 // determine the target. Otherwise use the center point of the gesture's | |
| 36 // bounding box to determine the target. | |
| 37 gfx::Rect rect(gesture.location(), gfx::Size(1, 1)); | |
| 38 if (views::switches::IsRectBasedTargetingEnabled() && | |
| 39 !gesture.details().bounding_box().IsEmpty()) { | |
| 40 // TODO(tdanderson): Pass in the bounding box to GetEventHandlerForRect() | |
| 41 // once crbug.com/313392 is resolved. | |
| 42 rect.set_size(gesture.details().bounding_box().size()); | |
| 43 rect.Offset(-rect.width() / 2, -rect.height() / 2); | |
| 44 } | |
| 45 | |
| 46 return root->GetEffectiveViewTargeter()->TargetForRect(root, rect); | |
| 47 } | |
| 48 | |
| 49 ui::EventTarget* RootViewTargeter::FindNextBestTargetForGestureEvent( | |
| 50 ui::EventTarget* previous_target, | |
| 51 const ui::GestureEvent& gesture) { | |
| 52 // ET_GESTURE_END events should only ever be targeted to the default | |
| 53 // gesture handler set by a previous gesture, if one exists. Thus we do not | |
| 54 // permit any re-targeting of ET_GESTURE_END events. | |
| 55 if (gesture.type() == ui::ET_GESTURE_END) | |
| 56 return NULL; | |
| 57 | |
| 58 // Prohibit re-targeting of gesture events (except for GESTURE_SCROLL_BEGIN | |
| 59 // events) if the default gesture handler was set by the dispatch of a | |
| 60 // previous gesture event. | |
| 61 if (root_view_->gesture_handler_set_before_processing_ && | |
| 62 gesture.type() != ui::ET_GESTURE_SCROLL_BEGIN) { | |
| 63 return NULL; | |
| 64 } | |
| 65 | |
| 66 // If |gesture_handler_| is NULL, it is either because the view was removed | |
| 67 // from the tree by the previous dispatch of |gesture| or because |gesture| is | |
| 68 // the GESTURE_END event corresponding to the removal of the last touch | |
| 69 // point. In either case, no further re-targeting of |gesture| should be | |
| 70 // permitted. | |
| 71 if (!root_view_->gesture_handler_) | |
| 72 return NULL; | |
| 73 | |
| 74 return previous_target->GetParentTarget(); | |
| 75 } | |
| 76 | |
| 77 } // namespace views | |
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