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| 1 // Copyright 2017 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 |
| 5 #include "components/viz/host/hit_test/hit_test_query.h" |
| 6 |
| 7 namespace viz { |
| 8 namespace hit_test { |
| 9 |
| 10 HitTestQuery::HitTestQuery() {} |
| 11 |
| 12 HitTestQuery::~HitTestQuery() {} |
| 13 |
| 14 Target HitTestQuery::FindTargetForLocation(const gfx::Point& location_in_root) { |
| 15 // TODO(riajiang): Assumptions about the DisplayHitTestDataList received. |
| 16 // 1. The list is in ascending (front to back) z-order. |
| 17 // 2. Children count includes children of children. |
| 18 // 3. After applying transform to the incoming point, point is in the same |
| 19 // coordinate system as the bounds it is comparing against. |
| 20 // For example, |
| 21 // +e-------------+ |
| 22 // | +c---------| |
| 23 // | 1 |+a--+ | |
| 24 // | || 2 | | |
| 25 // | |+b--------| |
| 26 // | || | |
| 27 // | || 3 | |
| 28 // +--------------+ |
| 29 // In this case, after applying identity transform, 1 is in the coordinate |
| 30 // system of e; apply the transfrom-from-e-to-c and transform-from-c-to-a |
| 31 // then we get 2 in the coordinate system of a; apply the |
| 32 // transfrom-from-e-to-c and transform-from-c-to-b then we get 3 in the |
| 33 // coordinate system of b. |
| 34 // 4. Transform contains transform for the position. |
| 35 // 5. HIT_TEST_MINE means the region can receive events, i.e., not just a |
| 36 // bounding box. The opposite is HIT_TEST_IGNORE. |
| 37 DCHECK(!display_hit_test_data_list_.empty()); |
| 38 Target target; |
| 39 FindTargetInRegionForLocation(location_in_root, |
| 40 &display_hit_test_data_list_.front(), &target); |
| 41 return target; |
| 42 } |
| 43 |
| 44 bool HitTestQuery::FindTargetInRegionForLocation( |
| 45 const gfx::Point& location_in_parent, |
| 46 DisplayHitTestData* region, |
| 47 Target* target) const { |
| 48 gfx::Point location_transformed(location_in_parent); |
| 49 region->transform.TransformPoint(&location_transformed); |
| 50 |
| 51 if (!region->bounds.Contains(location_transformed)) |
| 52 return false; |
| 53 |
| 54 DisplayHitTestData* child_region = region + 1; |
| 55 DisplayHitTestData* child_region_end = region + region->child_count; |
| 56 if (child_region_end > &display_hit_test_data_list_.back()) |
| 57 return false; |
| 58 |
| 59 while (child_region <= child_region_end) { |
| 60 if (FindTargetInRegionForLocation(location_transformed, child_region, |
| 61 target)) |
| 62 return true; |
| 63 |
| 64 child_region = child_region + child_region->child_count + 1; |
| 65 } |
| 66 |
| 67 // TODO(riajiang): Use flag values defined in |
| 68 // https://codereview.chromium.org/2938953002/. |
| 69 if (region->flags) { |
| 70 target->id = region->id; |
| 71 target->location_in_target = location_transformed; |
| 72 target->flags = region->flags; |
| 73 return true; |
| 74 } |
| 75 return false; |
| 76 } |
| 77 |
| 78 } // namespace hit_test |
| 79 } // namespace viz |
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