--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/osswebengine/WebCore/page/FocusController.cpp Mon Mar 30 12:54:55 2009 +0300
@@ -0,0 +1,300 @@
+/*
+ * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "FocusController.h"
+
+#include "AXObjectCache.h"
+#include "Chrome.h"
+#include "Document.h"
+#include "Editor.h"
+#include "EditorClient.h"
+#include "Element.h"
+#include "Event.h"
+#include "EventHandler.h"
+#include "EventNames.h"
+#include "Frame.h"
+#include "FrameView.h"
+#include "FrameTree.h"
+#include "HTMLFrameOwnerElement.h"
+#include "HTMLNames.h"
+#include "KeyboardEvent.h"
+#include "Page.h"
+#include "Range.h"
+#include "RenderObject.h"
+#include "RenderWidget.h"
+#include "SelectionController.h"
+#include "Widget.h"
+#include <wtf/Platform.h>
+
+namespace WebCore {
+
+using namespace EventNames;
+using namespace HTMLNames;
+
+FocusController::FocusController(Page* page)
+ : m_page(page)
+{
+}
+
+void FocusController::setFocusedFrame(PassRefPtr<Frame> frame)
+{
+ if (m_focusedFrame == frame)
+ return;
+
+ if (m_focusedFrame) {
+ m_focusedFrame->setWindowHasFocus(false);
+ m_focusedFrame->setIsActive(false);
+ }
+
+ m_focusedFrame = frame;
+
+ if (m_focusedFrame) {
+ m_focusedFrame->setWindowHasFocus(true);
+ m_focusedFrame->setIsActive(true);
+ }
+}
+
+Frame* FocusController::focusedOrMainFrame()
+{
+ if (Frame* frame = focusedFrame())
+ return frame;
+ return m_page->mainFrame();
+}
+
+static Node* deepFocusableNode(FocusDirection direction, Node* node, KeyboardEvent* event)
+{
+ // The node we found might be a HTMLFrameOwnerElement, so descend down the frame tree until we find either:
+ // 1) a focusable node, or
+ // 2) the deepest-nested HTMLFrameOwnerElement
+ while (node && node->isFrameOwnerElement()) {
+ HTMLFrameOwnerElement* owner = static_cast<HTMLFrameOwnerElement*>(node);
+ if (!owner->contentFrame())
+ break;
+
+ Document* document = owner->contentFrame()->document();
+ if (!document)
+ break;
+
+ node = (direction == FocusDirectionForward)
+ ? document->nextFocusableNode(0, event)
+ : document->previousFocusableNode(0, event);
+ if (!node) {
+ node = owner;
+ break;
+ }
+ }
+
+ return node;
+}
+
+bool FocusController::setInitialFocus(FocusDirection direction, KeyboardEvent* event)
+{
+ return advanceFocus(direction, event, true);
+}
+
+bool FocusController::advanceFocus(KeyboardEvent* event)
+{
+ return advanceFocus((event && event->shiftKey()) ? FocusDirectionBackward : FocusDirectionForward, event);
+}
+
+bool FocusController::advanceFocus(FocusDirection direction, KeyboardEvent* event, bool initialFocus)
+{
+ Frame* frame = focusedOrMainFrame();
+ ASSERT(frame);
+ Document* document = frame->document();
+ if (!document)
+ return false;
+
+ Node* node = (direction == FocusDirectionForward)
+ ? document->nextFocusableNode(document->focusedNode(), event)
+ : document->previousFocusableNode(document->focusedNode(), event);
+
+ // If there's no focusable node to advance to, move up the frame tree until we find one.
+ while (!node && frame) {
+ Frame* parentFrame = frame->tree()->parent();
+ if (!parentFrame)
+ break;
+
+ Document* parentDocument = parentFrame->document();
+ if (!parentDocument)
+ break;
+
+ HTMLFrameOwnerElement* owner = frame->ownerElement();
+ if (!owner)
+ break;
+
+ node = (direction == FocusDirectionForward)
+ ? parentDocument->nextFocusableNode(owner, event)
+ : parentDocument->previousFocusableNode(owner, event);
+
+ frame = parentFrame;
+ }
+
+ node = deepFocusableNode(direction, node, event);
+
+ if (!node) {
+ // We didn't find a node to focus, so we should try to pass focus to Chrome.
+ if (!initialFocus && m_page->chrome()->canTakeFocus(direction)) {
+ document->setFocusedNode(0);
+ setFocusedFrame(0);
+ m_page->chrome()->takeFocus(direction);
+ return true;
+ }
+
+ // Chrome doesn't want focus, so we should wrap focus.
+ if (Document* d = m_page->mainFrame()->document())
+ node = (direction == FocusDirectionForward)
+ ? d->nextFocusableNode(0, event)
+ : d->previousFocusableNode(0, event);
+
+ node = deepFocusableNode(direction, node, event);
+
+ if (!node)
+ return false;
+ }
+
+ ASSERT(node);
+
+ if (node == document->focusedNode())
+ // Focus wrapped around to the same node.
+ return true;
+
+ if (!node->isElementNode())
+ // FIXME: May need a way to focus a document here.
+ return false;
+
+ if (node->isFrameOwnerElement()) {
+ // We focus frames rather than frame owners.
+ // FIXME: We should not focus frames that have no scrollbars, as focusing them isn't useful to the user.
+ HTMLFrameOwnerElement* owner = static_cast<HTMLFrameOwnerElement*>(node);
+ if (!owner->contentFrame())
+ return false;
+
+ document->setFocusedNode(0);
+ setFocusedFrame(owner->contentFrame());
+ return true;
+ }
+
+ // FIXME: It would be nice to just be able to call setFocusedNode(node) here, but we can't do
+ // that because some elements (e.g. HTMLInputElement and HTMLTextAreaElement) do extra work in
+ // their focus() methods.
+
+ Document* newDocument = node->document();
+
+ if (newDocument != document)
+ // Focus is going away from this document, so clear the focused node.
+ document->setFocusedNode(0);
+
+ if (newDocument)
+ setFocusedFrame(newDocument->frame());
+
+ static_cast<Element*>(node)->focus(false);
+ return true;
+}
+
+static bool relinquishesEditingFocus(Node *node)
+{
+ ASSERT(node);
+ ASSERT(node->isContentEditable());
+
+ Node* root = node->rootEditableElement();
+ Frame* frame = node->document()->frame();
+ if (!frame || !root)
+ return false;
+
+ return frame->editor()->shouldEndEditing(rangeOfContents(root).get());
+}
+
+static void clearSelectionIfNeeded(Frame* oldFocusedFrame, Frame* newFocusedFrame, Node* newFocusedNode)
+{
+ if (!oldFocusedFrame || !newFocusedFrame)
+ return;
+
+ if (oldFocusedFrame->document() != newFocusedFrame->document())
+ return;
+
+ SelectionController* s = oldFocusedFrame->selectionController();
+ if (s->isNone())
+ return;
+
+ Node* selectionStartNode = s->selection().start().node();
+ if (selectionStartNode == newFocusedNode || selectionStartNode->isDescendantOf(newFocusedNode) || selectionStartNode->shadowAncestorNode() == newFocusedNode)
+ return;
+
+ if (Node* mousePressNode = newFocusedFrame->eventHandler()->mousePressNode())
+ if (mousePressNode->renderer() && !mousePressNode->canStartSelection())
+ if (Node* root = s->rootEditableElement())
+ if (Node* shadowAncestorNode = root->shadowAncestorNode())
+ // Don't do this for textareas and text fields, when they lose focus their selections should be cleared
+ // and then restored when they regain focus, to match other browsers.
+ if (!shadowAncestorNode->hasTagName(inputTag) && !shadowAncestorNode->hasTagName(textareaTag))
+ return;
+
+ s->clear();
+}
+
+bool FocusController::setFocusedNode(Node* node, PassRefPtr<Frame> newFocusedFrame)
+{
+ RefPtr<Frame> oldFocusedFrame = focusedFrame();
+ RefPtr<Document> oldDocument = oldFocusedFrame ? oldFocusedFrame->document() : 0;
+
+ Node* oldFocusedNode = oldDocument ? oldDocument->focusedNode() : 0;
+ if (oldFocusedNode == node)
+ return true;
+
+ if (oldFocusedNode && oldFocusedNode->rootEditableElement() == oldFocusedNode && !relinquishesEditingFocus(oldFocusedNode))
+ return false;
+
+ clearSelectionIfNeeded(oldFocusedFrame.get(), newFocusedFrame.get(), node);
+
+ if (!node) {
+ if (oldDocument)
+ oldDocument->setFocusedNode(0);
+ m_page->editorClient()->setInputMethodState(false);
+ return true;
+ }
+
+ RefPtr<Document> newDocument = node ? node->document() : 0;
+
+ if (newDocument && newDocument->focusedNode() == node) {
+ m_page->editorClient()->setInputMethodState(node->shouldUseInputMethod());
+ return true;
+ }
+
+ if (oldDocument && oldDocument != newDocument)
+ oldDocument->setFocusedNode(0);
+
+ setFocusedFrame(newFocusedFrame);
+
+ if (newDocument)
+ newDocument->setFocusedNode(node);
+
+ m_page->editorClient()->setInputMethodState(node->shouldUseInputMethod());
+
+ return true;
+}
+
+} // namespace WebCore