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- // 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/view_targeter.h"
- #include "ui/events/event_target.h"
- #include "ui/views/focus/focus_manager.h"
- #include "ui/views/view.h"
- #include "ui/views/view_targeter_delegate.h"
- namespace views {
- ViewTargeter::ViewTargeter(ViewTargeterDelegate* delegate)
- : delegate_(delegate) {
- DCHECK(delegate_);
- }
- ViewTargeter::~ViewTargeter() = default;
- bool ViewTargeter::DoesIntersectRect(const View* target,
- const gfx::Rect& rect) const {
- return delegate_->DoesIntersectRect(target, rect);
- }
- View* ViewTargeter::TargetForRect(View* root, const gfx::Rect& rect) const {
- return delegate_->TargetForRect(root, rect);
- }
- ui::EventTarget* ViewTargeter::FindTargetForEvent(ui::EventTarget* root,
- ui::Event* event) {
- View* view = static_cast<View*>(root);
- if (event->IsKeyEvent())
- return FindTargetForKeyEvent(view, *event->AsKeyEvent());
- if (event->IsScrollEvent())
- return FindTargetForScrollEvent(view, *event->AsScrollEvent());
- if (event->IsGestureEvent()) {
- ui::GestureEvent* gesture = event->AsGestureEvent();
- View* gesture_target = FindTargetForGestureEvent(view, *gesture);
- root->ConvertEventToTarget(gesture_target, gesture);
- return gesture_target;
- }
- NOTREACHED() << "ViewTargeter does not yet support this event type.";
- return nullptr;
- }
- ui::EventTarget* ViewTargeter::FindNextBestTarget(
- ui::EventTarget* previous_target,
- ui::Event* event) {
- if (!previous_target)
- return nullptr;
- if (event->IsGestureEvent()) {
- ui::GestureEvent* gesture = event->AsGestureEvent();
- ui::EventTarget* next_target =
- FindNextBestTargetForGestureEvent(previous_target, *gesture);
- previous_target->ConvertEventToTarget(next_target, gesture);
- return next_target;
- }
- return previous_target->GetParentTarget();
- }
- View* ViewTargeter::FindTargetForKeyEvent(View* root, const ui::KeyEvent& key) {
- if (root->GetFocusManager())
- return root->GetFocusManager()->GetFocusedView();
- return nullptr;
- }
- View* ViewTargeter::FindTargetForScrollEvent(View* root,
- const ui::ScrollEvent& scroll) {
- gfx::Rect rect(scroll.location(), gfx::Size(1, 1));
- return root->GetEffectiveViewTargeter()->TargetForRect(root, rect);
- }
- View* ViewTargeter::FindTargetForGestureEvent(View* root,
- const ui::GestureEvent& gesture) {
- // TODO(tdanderson): The only code path that performs targeting for gestures
- // uses the ViewTargeter installed on the RootView (i.e.,
- // a RootViewTargeter). Provide a default implementation
- // here if we need to be able to perform gesture targeting
- // starting at an arbitrary node in a Views tree.
- NOTREACHED();
- return nullptr;
- }
- ui::EventTarget* ViewTargeter::FindNextBestTargetForGestureEvent(
- ui::EventTarget* previous_target,
- const ui::GestureEvent& gesture) {
- NOTREACHED();
- return nullptr;
- }
- } // namespace views
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