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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_delegate.h"
- #include <limits.h>
- #include "base/containers/adapters.h"
- #include "ui/gfx/geometry/rect_conversions.h"
- #include "ui/views/rect_based_targeting_utils.h"
- #include "ui/views/view.h"
- namespace {
- // The minimum percentage of a view's area that needs to be covered by a rect
- // representing a touch region in order for that view to be considered by the
- // rect-based targeting algorithm.
- static const float kRectTargetOverlap = 0.6f;
- } // namespace
- namespace views {
- // TODO(tdanderson): Move the contents of rect_based_targeting_utils.(h|cc)
- // into here.
- bool ViewTargeterDelegate::DoesIntersectRect(const View* target,
- const gfx::Rect& rect) const {
- return target->GetLocalBounds().Intersects(rect);
- }
- View* ViewTargeterDelegate::TargetForRect(View* root, const gfx::Rect& rect) {
- // |rect_view| represents the current best candidate to return
- // if rect-based targeting (i.e., fuzzing) is used.
- // |rect_view_distance| is used to keep track of the distance
- // between the center point of |rect_view| and the center
- // point of |rect|.
- View* rect_view = nullptr;
- int rect_view_distance = INT_MAX;
- // |point_view| represents the view that would have been returned
- // from this function call if point-based targeting were used.
- View* point_view = nullptr;
- View::Views children = root->GetChildrenInZOrder();
- DCHECK_EQ(root->children().size(), children.size());
- for (auto* child : base::Reversed(children)) {
- if (!child->GetCanProcessEventsWithinSubtree() || !child->GetEnabled())
- continue;
- // Ignore any children which are invisible or do not intersect |rect|.
- if (!child->GetVisible())
- continue;
- gfx::RectF rect_in_child_coords_f(rect);
- View::ConvertRectToTarget(root, child, &rect_in_child_coords_f);
- gfx::Rect rect_in_child_coords =
- gfx::ToEnclosingRect(rect_in_child_coords_f);
- if (!child->HitTestRect(rect_in_child_coords))
- continue;
- View* cur_view = child->GetEventHandlerForRect(rect_in_child_coords);
- if (views::UsePointBasedTargeting(rect))
- return cur_view;
- gfx::RectF cur_view_bounds_f(cur_view->GetLocalBounds());
- View::ConvertRectToTarget(cur_view, root, &cur_view_bounds_f);
- gfx::Rect cur_view_bounds = gfx::ToEnclosingRect(cur_view_bounds_f);
- if (views::PercentCoveredBy(cur_view_bounds, rect) >= kRectTargetOverlap) {
- // |cur_view| is a suitable candidate for rect-based targeting.
- // Check to see if it is the closest suitable candidate so far.
- gfx::Point touch_center(rect.CenterPoint());
- int cur_dist = views::DistanceSquaredFromCenterToPoint(touch_center,
- cur_view_bounds);
- if (!rect_view || cur_dist < rect_view_distance) {
- rect_view = cur_view;
- rect_view_distance = cur_dist;
- }
- } else if (!rect_view && !point_view) {
- // Rect-based targeting has not yielded any candidates so far. Check
- // if point-based targeting would have selected |cur_view|.
- gfx::Point point_in_child_coords(rect_in_child_coords.CenterPoint());
- if (child->HitTestPoint(point_in_child_coords))
- point_view = child->GetEventHandlerForPoint(point_in_child_coords);
- }
- }
- if (views::UsePointBasedTargeting(rect) || (!rect_view && !point_view))
- return root;
- return rect_view ? rect_view : point_view;
- }
- } // namespace views
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