Implementing directional selection strategy in Blink.

public/web/WebSettings.h

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 75 matching lines @@
     // blink::HoverType enums, enforced by compile-time assertions in
     // AssertMatchingEnums.cpp.
     enum HoverType {
         HoverTypeNone = 1 << 0,
         // Indicates that the primary pointing system can hover, but it requires
         // a significant action on the user's part. e.g. hover on "long press".
         HoverTypeOnDemand = 1 << 1,
         HoverTypeHover = 1 << 2
     };
 
+    // Selection strategy defines how the selection granularity changes when the
+    // selection extent is moved.
+    enum class SelectionStrategyType {
+        // Always uses character granularity.
+        Character,
+        // "Expand by word, shrink by character" selection strategy.
+        // Uses character granularity when selection is shrinking. If the
+        // selection is expanding, granularity doesn't change until a word
+        // boundary is passed, after which the granularity switches to "word".
+        Direction
+    };
+
     // Sets value of a setting by its string identifier from Settings.in and
     // string representation of value. An enum's string representation is the
     // string representation of the integer value of the enum.
     virtual void setFromStrings(const WebString& name, const WebString& value) = 0;
 
     virtual bool mainFrameResizesAreOrientationChanges() const = 0;
     virtual int availablePointerTypes() const = 0;
     virtual PointerType primaryPointerType() const = 0;
     virtual int availableHoverTypes() const = 0;
     virtual HoverType primaryHoverType() const = 0;
@@ skipping 91 matching lines @@
     virtual void setPrimaryPointerType(PointerType) = 0;
     virtual void setAvailableHoverTypes(int) = 0;
     virtual void setPrimaryHoverType(HoverType) = 0;
     virtual void setRenderVSyncNotificationEnabled(bool) = 0;
     virtual void setReportScreenSizeInPhysicalPixelsQuirk(bool) = 0;
     virtual void setRootLayerScrolls(bool) = 0;
     virtual void setRubberBandingOnCompositorThread(bool) = 0;
     virtual void setSansSerifFontFamily(const WebString&, UScriptCode = USCRIPT_COMMON) = 0;
     virtual void setSelectTrailingWhitespaceEnabled(bool) = 0;
     virtual void setSelectionIncludesAltImageText(bool) = 0;
+    virtual void setSelectionStrategy(SelectionStrategyType) = 0;
     virtual void setSerifFontFamily(const WebString&, UScriptCode = USCRIPT_COMMON) = 0;
     virtual void setShouldPrintBackgrounds(bool) = 0;
     virtual void setShouldClearDocumentBackground(bool) = 0;
     virtual void setShouldRespectImageOrientation(bool) = 0;
     virtual void setShowContextMenuOnMouseUp(bool) = 0;
     virtual void setShowFPSCounter(bool) = 0;
     virtual void setShowPaintRects(bool) = 0;
     virtual void setShrinksStandaloneImagesToFit(bool) = 0;
     virtual void setShrinksViewportContentToFit(bool) = 0;
     virtual void setSmartInsertDeleteEnabled(bool) = 0;
@@ skipping 45 matching lines @@
     virtual void setWideViewportQuirkEnabled(bool) = 0;
     virtual void setXSSAuditorEnabled(bool) = 0;
 
 protected:
     ~WebSettings() { }
 };
 
 } // namespace blink
 
 #endif