From 8a2820a90f85f91c500a9d382f8e8ba870fb621c Mon Sep 17 00:00:00 2001 From: "ojan@google.com" Date: Thu, 9 Oct 2008 21:58:05 +0000 Subject: Patch by Thatcher Ulrich . Implement "iframe shim" behavior for windowed plugins. In FF and IE on windows, iframes are implemented as native HWNDs. This has the side effect that iframes display on top of windowed plugins. This side effect has long been known as a workaround for allowing HTML elements to appear above plugin content. BUG=1788 Review URL: http://codereview.chromium.org/7032 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@3137 0039d316-1c4b-4281-b951-d872f2087c98 --- webkit/glue/stacking_order_iterator.h | 73 +++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100755 webkit/glue/stacking_order_iterator.h (limited to 'webkit/glue/stacking_order_iterator.h') diff --git a/webkit/glue/stacking_order_iterator.h b/webkit/glue/stacking_order_iterator.h new file mode 100755 index 0000000..20dea41 --- /dev/null +++ b/webkit/glue/stacking_order_iterator.h @@ -0,0 +1,73 @@ +// Copyright (c) 2006-2008 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. + +// Provides some utilities for iterating over a RenderObject graph in +// stacking order. + +#ifndef WEBKIT_GLUE_STACKING_ORDER_ITERATOR_H__ +#define WEBKIT_GLUE_STACKING_ORDER_ITERATOR_H__ + +#include + +namespace WebCore { +class RenderLayer; +class RenderObject; +} + +// Iterates over a subtree of RenderLayers in stacking order, back to +// front. Modifying the RenderObject graph invalidates this iterator. +// +// TODO(tulrich): this could go in webkit. +// TODO(tulrich): needs unittests. +class RenderLayerIterator { + public: + RenderLayerIterator(); + + // Sets the RenderLayer subtree to iterate over. + void Reset(WebCore::RenderLayer* rl); + + // Returns the next RenderLayer in stacking order, back to front. + WebCore::RenderLayer* Next(); + private: + class Context { + public: + Context(WebCore::RenderLayer* layer); + + bool HasMoreNeg(); + Context NextNeg(); + bool HasSelf(); + WebCore::RenderLayer* NextSelf(); + bool HasMoreOverflow(); + Context NextOverflow(); + bool HasMorePos(); + Context NextPos(); + + private: + WebCore::RenderLayer* layer_; + size_t next_neg_; + size_t next_self_; + size_t next_overflow_; + size_t next_pos_; + }; + + std::vector context_stack_; +}; + +// Iterates over a subtree of RenderObjects below a given RenderLayer. +// +// TODO(tulrich): this could go in webkit. +// TODO(tulrich): needs unittests. +class StackingOrderIterator { + public: + StackingOrderIterator(); + void Reset(WebCore::RenderLayer* rl); + WebCore::RenderObject* Next(); + + private: + RenderLayerIterator layer_iterator_; + WebCore::RenderObject* current_object_; + WebCore::RenderObject* current_layer_root_; +}; + +#endif // WEBKIT_GLUE_STACKING_ORDER_ITERATOR_H__ -- cgit v1.1