Move DragCaretController class to its own file

Source/core/editing/DragCaretController.cpp

Index: Source/core/editing/DragCaretController.cpp
diff --git a/Source/core/editing/Caret.cpp b/Source/core/editing/DragCaretController.cpp
similarity index 37%
copy from Source/core/editing/Caret.cpp
copy to Source/core/editing/DragCaretController.cpp
index 4afb89d11851d0758e1b1e131f8e78f635382aef..0c9c5a37088da9dffcb4a4d86a415fe89f3bb77f 100644
--- a/Source/core/editing/Caret.cpp
+++ b/Source/core/editing/DragCaretController.cpp
@@ -24,27 +24,14 @@
  */
 
 #include "config.h"
-#include "core/editing/Caret.h"
+#include "core/editing/DragCaretController.h"
 
-#include "core/dom/Document.h"
-#include "core/editing/VisibleUnits.h"
 #include "core/editing/htmlediting.h"
-#include "core/frame/LocalFrame.h"
-#include "core/frame/Settings.h"
-#include "core/html/HTMLTextFormControlElement.h"
-#include "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutView.h"
 #include "core/paint/DeprecatedPaintLayer.h"
-#include "platform/graphics/GraphicsContext.h"
 
 namespace blink {
 
-CaretBase::CaretBase(CaretVisibility visibility)
-    : m_caretPainter(nullptr)
-    , m_caretVisibility(visibility)
-{
-}
-
 DragCaretController::DragCaretController()
     : CaretBase(Visible)
 {
@@ -63,7 +50,8 @@ bool DragCaretController::isContentRichlyEditable() const
 void DragCaretController::setCaretPosition(const VisiblePosition& position)
 {
     // for querying Layer::compositingState()
-    // This code is probably correct, since it doesn't occur in a stack that involves updating compositing state.
+    // This code is probably correct, since it doesn't occur in a stack that
+    // involves updating compositing state.
     DisableCompositingQueryAsserts disabler;
 
     if (Node* node = m_position.deepEquivalent().deprecatedNode())
@@ -114,172 +102,10 @@ DEFINE_TRACE(DragCaretController)
     visitor->trace(m_position);
 }
 
-void CaretBase::clearCaretRect()
-{
-    m_caretPainter = nullptr;
-    m_caretLocalRect = LayoutRect();
-}
-
-static inline bool caretRendersInsideNode(Node* node)
-{
-    return node && !isRenderedTableElement(node) && !editingIgnoresContent(node);
-}
-
-LayoutBlock* CaretBase::caretLayoutObject(Node* node)
-{
-    if (!node)
-        return 0;
-
-    LayoutObject* layoutObject = node->layoutObject();
-    if (!layoutObject)
-        return 0;
-
-    // if caretNode is a block and caret is inside it then caret should be painted by that block
-    bool paintedByBlock = layoutObject->isLayoutBlock() && caretRendersInsideNode(node);
-    return paintedByBlock ? toLayoutBlock(layoutObject) : layoutObject->containingBlock();
-}
-
-static void mapCaretRectToCaretPainter(LayoutObject* caretLayoutObject, LayoutBlock* caretPainter, LayoutRect& caretRect)
-{
-    // FIXME: This shouldn't be called on un-rooted subtrees.
-    // FIXME: This should probably just use mapLocalToContainer.
-    // Compute an offset between the caretLayoutObject and the caretPainter.
-
-    ASSERT(caretLayoutObject->isDescendantOf(caretPainter));
-
-    bool unrooted = false;
-    while (caretLayoutObject != caretPainter) {
-        LayoutObject* containerObject = caretLayoutObject->container();
-        if (!containerObject) {
-            unrooted = true;
-            break;
-        }
-        caretRect.move(caretLayoutObject->offsetFromContainer(containerObject, caretRect.location()));
-        caretLayoutObject = containerObject;
-    }
-
-    if (unrooted)
-        caretRect = LayoutRect();
-}
-
-bool CaretBase::updateCaretRect(Document* document, const PositionWithAffinity& caretPosition)
-{
-    m_caretPainter = nullptr;
-    m_caretLocalRect = LayoutRect();
-
-    if (caretPosition.position().isNull())
-        return false;
-
-    ASSERT(caretPosition.position().deprecatedNode()->layoutObject());
-
-    // First compute a rect local to the layoutObject at the selection start.
-    LayoutObject* layoutObject;
-    m_caretLocalRect = localCaretRectOfPosition(caretPosition, layoutObject);
-
-    // Get the layoutObject that will be responsible for painting the caret
-    // (which is either the layoutObject we just found, or one of its containers).
-    m_caretPainter = caretLayoutObject(caretPosition.position().deprecatedNode());
-
-    mapCaretRectToCaretPainter(layoutObject, m_caretPainter, m_caretLocalRect);
-
-    return true;
-}
-
-bool CaretBase::updateCaretRect(Document* document, const VisiblePosition& caretPosition)
-{
-    return updateCaretRect(document, PositionWithAffinity(caretPosition.deepEquivalent(), caretPosition.affinity()));
-}
-
-IntRect CaretBase::absoluteBoundsForLocalRect(Node* node, const LayoutRect& rect) const
-{
-    LayoutBlock* caretPainter = caretLayoutObject(node);
-    if (!caretPainter)
-        return IntRect();
-
-    LayoutRect localRect(rect);
-    caretPainter->flipForWritingMode(localRect);
-    return caretPainter->localToAbsoluteQuad(FloatRect(localRect)).enclosingBoundingBox();
-}
-
-void CaretBase::invalidateLocalCaretRect(Node* node, const LayoutRect& rect)
-{
-    LayoutBlock* caretPainter = caretLayoutObject(node);
-    if (!caretPainter)
-        return;
-
-    // FIXME: Need to over-paint 1 pixel to workaround some rounding problems.
-    // https://bugs.webkit.org/show_bug.cgi?id=108283
-    LayoutRect inflatedRect = rect;
-    inflatedRect.inflate(1);
-
-    // FIXME: We should use mapLocalToContainer() since we know we're not un-rooted.
-    mapCaretRectToCaretPainter(node->layoutObject(), caretPainter, inflatedRect);
-
-    // FIXME: We should not allow paint invalidation out of paint invalidation state. crbug.com/457415
-    DisablePaintInvalidationStateAsserts disabler;
-    caretPainter->invalidatePaintRectangle(inflatedRect);
-}
-
-bool CaretBase::shouldRepaintCaret(Node& node) const
-{
-    // If PositionAnchorType::BeforeAnchor or PositionAnchorType::AfterAnchor,
-    // carets need to be repainted not only when the node is contentEditable but
-    // also when its parentNode() is contentEditable.
-    return node.isContentEditable() || (node.parentNode() && node.parentNode()->isContentEditable());
-}
-
-bool CaretBase::shouldRepaintCaret(const LayoutView* view) const
-{
-    ASSERT(view);
-    if (FrameView* frameView = view->frameView()) {
-        LocalFrame& frame = frameView->frame(); // The frame where the selection started
-        return frame.settings() && frame.settings()->caretBrowsingEnabled();
-    }
-    return false;
-}
-
-void CaretBase::invalidateCaretRect(Node* node, bool caretRectChanged)
-{
-    if (caretRectChanged)
-        return;
-
-    if (LayoutView* view = node->document().layoutView()) {
-        if (node->isContentEditable(Node::UserSelectAllIsAlwaysNonEditable) || shouldRepaintCaret(view))
-            invalidateLocalCaretRect(node, localCaretRectWithoutUpdate());
-    }
-}
-
-void CaretBase::paintCaret(Node* node, GraphicsContext* context, const LayoutPoint& paintOffset, const LayoutRect& clipRect) const
-{
-    if (m_caretVisibility == Hidden)
-        return;
-
-    LayoutRect drawingRect = localCaretRectWithoutUpdate();
-    if (LayoutBlock* layoutObject = caretLayoutObject(node))
-        layoutObject->flipForWritingMode(drawingRect);
-    drawingRect.moveBy(roundedIntPoint(paintOffset));
-    LayoutRect caret = intersection(drawingRect, clipRect);
-    if (caret.isEmpty())
-        return;
-
-    Color caretColor = Color::black;
-
-    Element* element;
-    if (node->isElementNode())
-        element = toElement(node);
-    else
-        element = node->parentElement();
-
-    if (element && element->layoutObject())
-        caretColor = element->layoutObject()->resolveColor(CSSPropertyColor);
-
-    context->fillRect(caret, caretColor);
-}
-
 void DragCaretController::paintDragCaret(LocalFrame* frame, GraphicsContext* p, const LayoutPoint& paintOffset, const LayoutRect& clipRect) const
 {
     if (m_position.deepEquivalent().deprecatedNode()->document().frame() == frame)
         paintCaret(m_position.deepEquivalent().deprecatedNode(), p, paintOffset, clipRect);
 }
 
-}
+} // namespace blink