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44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MouseEventHitRegion_h
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#define MouseEventHitRegion_h
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#include "core/events/MouseEvent.h"
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#include "core/html/HTMLCanvasElement.h"
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#include "core/html/canvas/CanvasRenderingContext.h"
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#include "core/html/canvas/CanvasRenderingContext2D.h"
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namespace blink {
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class MouseEventHitRegion {
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public:
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static String region(MouseEvent& event)
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{
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if (!event.target() || !isHTMLCanvasElement(event.target()->toNode()))
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return String();
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HTMLCanvasElement* canvas = toHTMLCanvasElement(event.target()->toNode());
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CanvasRenderingContext* context = canvas->renderingContext();
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if (!context || !context->is2d())
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return String();
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HitRegion* hitRegion = toCanvasRenderingContext2D(context)->
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hitRegionAtPoint(LayoutPoint(event.offsetX(), event.offsetY()));
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if (!hitRegion)
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return String();
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String id = hitRegion->id();
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if (id.isEmpty())
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return String();
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return id;
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}
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};
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} // namespace blink
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#endif
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