view_targeter.cc 3.2 KB

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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. #include "ui/views/view_targeter.h"
  5. #include "ui/events/event_target.h"
  6. #include "ui/views/focus/focus_manager.h"
  7. #include "ui/views/view.h"
  8. #include "ui/views/view_targeter_delegate.h"
  9. namespace views {
  10. ViewTargeter::ViewTargeter(ViewTargeterDelegate* delegate)
  11. : delegate_(delegate) {
  12. DCHECK(delegate_);
  13. }
  14. ViewTargeter::~ViewTargeter() = default;
  15. bool ViewTargeter::DoesIntersectRect(const View* target,
  16. const gfx::Rect& rect) const {
  17. return delegate_->DoesIntersectRect(target, rect);
  18. }
  19. View* ViewTargeter::TargetForRect(View* root, const gfx::Rect& rect) const {
  20. return delegate_->TargetForRect(root, rect);
  21. }
  22. ui::EventTarget* ViewTargeter::FindTargetForEvent(ui::EventTarget* root,
  23. ui::Event* event) {
  24. View* view = static_cast<View*>(root);
  25. if (event->IsKeyEvent())
  26. return FindTargetForKeyEvent(view, *event->AsKeyEvent());
  27. if (event->IsScrollEvent())
  28. return FindTargetForScrollEvent(view, *event->AsScrollEvent());
  29. if (event->IsGestureEvent()) {
  30. ui::GestureEvent* gesture = event->AsGestureEvent();
  31. View* gesture_target = FindTargetForGestureEvent(view, *gesture);
  32. root->ConvertEventToTarget(gesture_target, gesture);
  33. return gesture_target;
  34. }
  35. NOTREACHED() << "ViewTargeter does not yet support this event type.";
  36. return nullptr;
  37. }
  38. ui::EventTarget* ViewTargeter::FindNextBestTarget(
  39. ui::EventTarget* previous_target,
  40. ui::Event* event) {
  41. if (!previous_target)
  42. return nullptr;
  43. if (event->IsGestureEvent()) {
  44. ui::GestureEvent* gesture = event->AsGestureEvent();
  45. ui::EventTarget* next_target =
  46. FindNextBestTargetForGestureEvent(previous_target, *gesture);
  47. previous_target->ConvertEventToTarget(next_target, gesture);
  48. return next_target;
  49. }
  50. return previous_target->GetParentTarget();
  51. }
  52. View* ViewTargeter::FindTargetForKeyEvent(View* root, const ui::KeyEvent& key) {
  53. if (root->GetFocusManager())
  54. return root->GetFocusManager()->GetFocusedView();
  55. return nullptr;
  56. }
  57. View* ViewTargeter::FindTargetForScrollEvent(View* root,
  58. const ui::ScrollEvent& scroll) {
  59. gfx::Rect rect(scroll.location(), gfx::Size(1, 1));
  60. return root->GetEffectiveViewTargeter()->TargetForRect(root, rect);
  61. }
  62. View* ViewTargeter::FindTargetForGestureEvent(View* root,
  63. const ui::GestureEvent& gesture) {
  64. // TODO(tdanderson): The only code path that performs targeting for gestures
  65. // uses the ViewTargeter installed on the RootView (i.e.,
  66. // a RootViewTargeter). Provide a default implementation
  67. // here if we need to be able to perform gesture targeting
  68. // starting at an arbitrary node in a Views tree.
  69. NOTREACHED();
  70. return nullptr;
  71. }
  72. ui::EventTarget* ViewTargeter::FindNextBestTargetForGestureEvent(
  73. ui::EventTarget* previous_target,
  74. const ui::GestureEvent& gesture) {
  75. NOTREACHED();
  76. return nullptr;
  77. }
  78. } // namespace views