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// Copyright 2014 The Chromium Authors
// 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 <memory>
#include <utility>
#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(std::unique_ptr<ViewTargeterDelegate> delegate)
: owned_delegate_(std::move(delegate)), delegate_(owned_delegate_.get()) {
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* const view = static_cast<View*>(root);
if (event->IsKeyEvent()) {
return FindTargetForKeyEvent(view, *event->AsKeyEvent());
}
if (event->IsScrollEvent()) {
return FindTargetForScrollEvent(view, *event->AsScrollEvent());
}
CHECK(event->IsGestureEvent())
<< "ViewTargeter does not yet support this event type.";
ui::GestureEvent* gesture = event->AsGestureEvent();
View* gesture_target = FindTargetForGestureEvent(view, *gesture);
root->ConvertEventToTarget(gesture_target, gesture);
return gesture_target;
}
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();
}
ui::EventTarget* ViewTargeter::FindNextBestTargetForGestureEvent(
ui::EventTarget* previous_target,
const ui::GestureEvent& gesture) {
NOTREACHED();
}
} // namespace views
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