[Reland] Refactor the selection code in EventHandler

Source/core/editing/SelectionController.h

Index: Source/core/editing/SelectionController.h
diff --git a/Source/core/editing/SelectionController.h b/Source/core/editing/SelectionController.h
new file mode 100644
index 0000000000000000000000000000000000000000..7052833130a59d61d45df47ad9f54c1775ae155a
--- /dev/null
+++ b/Source/core/editing/SelectionController.h
@@ -0,0 +1,63 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.

[yosin_UTC9, 2015/05/18 08:53:46]

nit: Please use copyright comments in "EventHandler.h". Since, this file holds
contents from "EventHandler.h"

[Miyoung Shin(g), 2015/05/19 09:01:42]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SelectionController_h
+#define SelectionController_h
+#include "core/CoreExport.h"

[yosin_UTC9, 2015/05/18 08:53:46]

nit: Please have a blank line between guard macro and the first #include.

[Miyoung Shin(g), 2015/05/19 09:01:42]

Done.

+#include "core/editing/TextGranularity.h"
+#include "core/page/EventWithHitTestResults.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class LocalFrame;

[yosin_UTC9, 2015/05/18 08:53:46]

Please in alphabetical order.

[Miyoung Shin(g), 2015/05/19 09:01:42]

Done.

+class HitTestResult;
+class VisibleSelection;
+
+enum AppendTrailingWhitespace { ShouldAppendTrailingWhitespace, DontAppendTrailingWhitespace };
+
+class CORE_EXPORT SelectionController {

[yosin_UTC9, 2015/05/18 08:53:46]

nit: Please put |final|.

[Miyoung Shin(g), 2015/05/19 09:01:42]

Done.

+    DISALLOW_ALLOCATION();

[yosin_UTC9, 2015/05/18 08:53:46]

Let's make |SelectionControler| allocatable to avoid including
"SelectionController.h" in "EventHandler.h".

See "Page.h", there are number of controllers holding in |OwnPtr<T>|, e.g.
|const OwnPtr<AutoscrollController> m_autoscrollController|. This is Blink idiom
of "pimpl" pattern.

[yosin_UTC9, 2015/05/18 08:53:46]

nit: Please add |WTF_MAKE_NONCOPYABLE(SelectionController)|

[Miyoung Shin(g), 2015/05/19 09:01:42]

Done.

[Miyoung Shin(g), 2015/05/19 09:01:42]

Done.

+public:
+    explicit SelectionController(LocalFrame*);
+    ~SelectionController();
+
+    void clear();
+
+    bool updateSelectionForMouseDownDispatchingSelectStart(Node*, const VisibleSelection&, TextGranularity);
+    void selectClosestWordFromHitTestResult(const HitTestResult&, AppendTrailingWhitespace);
+    void selectClosestMisspellingFromHitTestResult(const HitTestResult&, AppendTrailingWhitespace);
+    void selectClosestWordFromMouseEvent(const MouseEventWithHitTestResults&);
+    void selectClosestMisspellingFromMouseEvent(const MouseEventWithHitTestResults&);
+    void selectClosestWordOrLinkFromMouseEvent(const MouseEventWithHitTestResults&);
+
+    void handleMousePressEvent(const MouseEventWithHitTestResults&);
+    bool handleMousePressEventSingleClick(const MouseEventWithHitTestResults&);
+    bool handleMousePressEventDoubleClick(const MouseEventWithHitTestResults&);
+    bool handleMousePressEventTripleClick(const MouseEventWithHitTestResults&);
+    void handleMouseDraggedEvent(const MouseEventWithHitTestResults&, const IntPoint&, const LayoutPoint&, const RefPtr<Node>, const IntPoint&);
+    bool handleMouseReleaseEvent(const MouseEventWithHitTestResults&, const LayoutPoint&);
+    bool handlePasteGlobalSelection(const PlatformMouseEvent&);
+
+    void updateSelectionForMouseDrag(const RefPtr<Node>, const LayoutPoint&, const IntPoint&);
+    void updateSelectionForMouseDrag(const HitTestResult&, const RefPtr<Node>, const LayoutPoint&, const IntPoint&);
+    void selectionForContextMenu(const MouseEventWithHitTestResults&, const LayoutPoint&);
+    void releaseSelection(MouseEventWithHitTestResults&);
+
+    void initializeSelectionState() { m_selectionState = HaveNotStartedSelection; }

[yosin_UTC9, 2015/05/18 08:53:46]

Let's do this in CPP file.

See:
http://dev.chromium.org/developers/coding-style/cpp-dos-and-donts#TOC-Stop-in...

[Miyoung Shin(g), 2015/05/19 09:01:42]

Oh, I thought that it's ok to refer to the legacy-coding style of the WebKit,
because we have still many codes in header file like this. Thanks for the good
information.

+    void setAllowSelection(bool allow) { m_allowSelection = allow; }
+    bool allowSelection() const { return m_allowSelection; }
+    bool singleClickInSelection() { return m_singleClickInSelection; }

[yosin_UTC9, 2015/05/18 08:53:46]

nit: |const|.

[Miyoung Shin(g), 2015/05/19 09:01:42]

Done.

+
+private:
+    LocalFrame* const m_frame;
+
+    bool m_allowSelection;
+    bool m_singleClickInSelection;
+    enum SelectionState { HaveNotStartedSelection, PlacedCaret, ExtendedSelection };

[yosin_UTC9, 2015/05/18 08:53:46]

Let't use |enum class| for better static check.

[Miyoung Shin(g), 2015/05/19 09:01:42]

Done.

+    SelectionState m_selectionState;
+};
+
+}
+#endif // SelectionController_h