Add LayoutRoot

sky/engine/core/painting/LayoutRoot.cpp

+// Copyright 2015 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.
+
+#include "sky/engine/config.h"
+#include "sky/engine/core/painting/LayoutRoot.h"
+
+#include "sky/engine/core/dom/Document.h"
+#include "sky/engine/core/dom/Element.h"
+#include "sky/engine/core/frame/FrameView.h"
+#include "sky/engine/core/frame/LocalFrame.h"
+#include "sky/engine/core/frame/Settings.h"
+#include "sky/engine/core/painting/PaintingTasks.h"
+#include "sky/engine/platform/geometry/IntRect.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+
+namespace blink {
+
+PassRefPtr<LayoutRoot> LayoutRoot::create()
+{
+    return adoptRef(new LayoutRoot);
+}
+
+LayoutRoot::LayoutRoot()
+    : m_minWidth(0)
+    , m_maxWidth(0)
+    , m_minHeight(0)
+    , m_maxHeight(0)
+{
+    m_settings = Settings::create();
+    m_settings->setDefaultFixedFontSize(13);
+    m_settings->setDefaultFontSize(16);
+    m_frameHost = FrameHost::createDummy(m_settings.get());
+    m_frame = LocalFrame::create(nullptr, m_frameHost.get());
+    m_frame->createView(IntSize(), Color::white, false);
+}
+
+LayoutRoot::~LayoutRoot()
+{
+}
+
+Element* LayoutRoot::rootElement() const
+{
+    if (!m_document)
+        return nullptr;
+    return m_document->firstElementChild();
+}
+
+void LayoutRoot::setRootElement(Element* root)
+{
+    m_document = &root->document();
+    m_frame->setDocument(m_document.get());
+    m_document->setFrame(m_frame.get());
+
+    m_document->attach();
+    m_document->setChild(root, ASSERT_NO_EXCEPTION);
+
+    m_document->setFrame(nullptr);
+    m_frame->setDocument(nullptr);
+}
+
+void LayoutRoot::layout()
+{
+    m_frame->setDocument(m_document.get());
+    m_document->setFrame(m_frame.get());
+
+    LayoutUnit maxWidth = std::max(m_minWidth, m_maxWidth);
+    LayoutUnit maxHeight = std::max(m_minHeight, m_maxHeight);
+    IntSize maxSize(maxWidth, maxHeight);
+
+    m_frame->view()->setFrameRect(IntRect(IntPoint(), maxSize));
+    m_frame->view()->setLayoutSize(maxSize);
+
+    m_document->updateLayout();
+
+    m_document->setFrame(nullptr);
+    m_frame->setDocument(nullptr);
+}
+
+} // namespace blink