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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_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 (views::View* 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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