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1 // Copyright 2015 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 "modules/canvas2d/EventHitRegion.h" | |
6 | |
7 #include "core/dom/Document.h" | |
8 #include "core/html/HTMLCanvasElement.h" | |
9 #include "core/layout/LayoutBox.h" | |
10 #include "core/page/Page.h" | |
11 #include "modules/canvas2d/CanvasRenderingContext2D.h" | |
12 #include "modules/canvas2d/HitRegion.h" | |
13 | |
14 namespace blink { | |
15 | |
16 String EventHitRegion::regionIdFromAbsoluteLocation(HTMLCanvasElement& canvas, c
onst LayoutPoint& location) | |
17 { | |
18 CanvasRenderingContext* context = canvas.renderingContext(); | |
19 if (!context || !context->is2d()) | |
20 return String(); | |
21 | |
22 Document& document = canvas.document(); | |
23 document.updateLayoutTreeForNodeIfNeeded(&canvas); | |
24 | |
25 // Adjust offsetLocation to be relative to the canvas's position. | |
26 LayoutBox* box = canvas.layoutBox(); | |
27 FloatPoint localPos = box->absoluteToLocal(FloatPoint(location), UseTransfor
ms); | |
28 if (box->hasBorderOrPadding()) | |
29 localPos.move(-box->contentBoxOffset()); | |
30 localPos.scale(canvas.width() / box->contentWidth(), canvas.height() / box->
contentHeight()); | |
31 | |
32 HitRegion* hitRegion = toCanvasRenderingContext2D(context)->hitRegionAtPoint
(localPos); | |
33 if (!hitRegion || hitRegion->id().isEmpty()) | |
34 return String(); | |
35 | |
36 return hitRegion->id(); | |
37 } | |
38 | |
39 } // namespace blink | |
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