Templatize handleMousePressEventSingleClick in SelectionController

Source/core/editing/SelectionController.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  * Copyright (C) 2015 Google 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
@@ skipping 232 matching lines @@
     return updateSelectionForMouseDownDispatchingSelectStart(innerNode, expandSelectionToRespectUserSelectAll(innerNode, newSelection), ParagraphGranularity);
 }
 
 static int textDistance(const Position& start, const Position& end)
 {
     return TextIterator::rangeLength(start, end, true);
 }
 
 bool SelectionController::handleMousePressEventSingleClick(const MouseEventWithHitTestResults& event)
 {
+    return handleMousePressEventSingleClickAlgorithm<VisibleSelection::InDOMTree>(event);
+}
+
+template <typename Strategy>
+bool SelectionController::handleMousePressEventSingleClickAlgorithm(const MouseEventWithHitTestResults& event)
+{
     TRACE_EVENT0("blink", "SelectionController::handleMousePressEventSingleClick");
+    using PositionType = typename Strategy::PositionType;
 
     m_frame->document()->updateLayoutIgnorePendingStylesheets();
     Node* innerNode = event.innerNode();
     if (!(innerNode && innerNode->layoutObject() && m_mouseDownMayStartSelect))
         return false;
 
     // Extend the selection if the Shift key is down, unless the click is in a link.
     bool extendSelection = event.event().shiftKey() && !event.isOverLink();
 
     // Don't restart the selection when the mouse is pressed on an
     // existing selection so we can allow for text dragging.
     if (FrameView* view = m_frame->view()) {
         LayoutPoint vPoint = view->rootFrameToContents(event.event().position());
         if (!extendSelection && m_frame->selection().contains(vPoint)) {
             m_mouseDownWasSingleClickInSelection = true;
             return false;
         }
     }
 
     VisiblePosition visiblePos(innerNode->layoutObject()->positionForPoint(event.localPoint()));
     if (visiblePos.isNull())
         visiblePos = VisiblePosition(firstPositionInOrBeforeNode(innerNode), DOWNSTREAM);
-    Position pos = visiblePos.deepEquivalent();
+    PositionType pos = Strategy::toPositionType(visiblePos.deepEquivalent());
 
     VisibleSelection newSelection = m_frame->selection().selection();
     TextGranularity granularity = CharacterGranularity;
 
     if (extendSelection && newSelection.isCaretOrRange()) {
         VisibleSelection selectionInUserSelectAll(expandSelectionToRespectUserSelectAll(innerNode, VisibleSelection(VisiblePosition(pos))));
         if (selectionInUserSelectAll.isRange()) {
-            if (comparePositions(selectionInUserSelectAll.start(), newSelection.start()) < 0)
-                pos = selectionInUserSelectAll.start();
-            else if (comparePositions(newSelection.end(), selectionInUserSelectAll.end()) < 0)
-                pos = selectionInUserSelectAll.end();
+            if (Strategy::selectionStart(selectionInUserSelectAll).compareTo(Strategy::selectionStart(newSelection)) < 0)
+                pos = Strategy::selectionStart(selectionInUserSelectAll);
+            else if (Strategy::selectionEnd(newSelection).compareTo(Strategy::selectionEnd(selectionInUserSelectAll)) < 0)
+                pos = Strategy::selectionEnd(selectionInUserSelectAll);
         }
 
         if (!m_frame->editor().behavior().shouldConsiderSelectionAsDirectional()) {
             if (pos.isNotNull()) {
                 // See <rdar://problem/3668157> REGRESSION (Mail): shift-click deselects when selection
                 // was created right-to-left
-                Position start = newSelection.start();
-                Position end = newSelection.end();
+                PositionType start = Strategy::selectionStart(newSelection);
+                PositionType end = Strategy::selectionEnd(newSelection);
                 int distanceToStart = textDistance(start, pos);
                 int distanceToEnd = textDistance(pos, end);
                 if (distanceToStart <= distanceToEnd)
                     newSelection = VisibleSelection(end, pos);
                 else
                     newSelection = VisibleSelection(start, pos);
             }
         } else {
             newSelection.setExtent(pos);
         }
@@ skipping 275 matching lines @@
 {
     return m_mouseDownMayStartSelect;
 }
 
 bool SelectionController::mouseDownWasSingleClickInSelection() const
 {
     return m_mouseDownWasSingleClickInSelection;
 }
 
 } // namespace blink