Add ability to defined ranges with different styles in StyledLabel

ui/views/controls/styled_label.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_CONTROLS_STYLED_LABEL_H_
 #define UI_VIEWS_CONTROLS_STYLED_LABEL_H_
 
 #include <map>
 #include <queue>
 
 #include "base/basictypes.h"
 #include "base/string16.h"
 #include "ui/base/range/range.h"
 #include "ui/gfx/size.h"
 #include "ui/views/controls/link_listener.h"
 #include "ui/views/view.h"
 
 namespace views {
 
 class Link;
 class StyledLabelListener;
 
 // A class which can apply mixed styles to a block of text. Currently, text is
-// always multiline, and the only style that may be applied is linkifying ranges
-// of text.
+// always multiline. Trailing whitespace in the styled label text is not
+// supported and will be trimmed on StyledLabel construction. Leading
+// whitespace is respected, provided not only whitespace fits in the first line.
+// In this case, leading whitespace is ignored.
 class VIEWS_EXPORT StyledLabel : public View, public LinkListener {
  public:
+  // Parameters that define label style for a styled label's text range.
+  struct RangeStyleInfo {
+    RangeStyleInfo();
+    ~RangeStyleInfo();
+
+    // Creates a range style info with default values for link.
+    static RangeStyleInfo CreateForLink();
+
+    // The font style that will be applied to the range. Should be a bitmask of
+    // values defined in gfx::Font::FontStyle (BOLD, ITALIC, UNDERLINE).
+    int font_style;
+
+    // Tooltip for the range.
+    string16 tooltip;
+
+    // If set, the whole range will be put on a single line.
+    bool disable_line_wrapping;
+
+    // If set, the range will be created as a link.
+    bool is_link;
+  };
+
+  // Note that any trailing whitespace in |text| will be trimmed.
   StyledLabel(const string16& text, StyledLabelListener* listener);
   virtual ~StyledLabel();
 
-  // Marks the given range within |text_| as a link.
-  void AddLink(const ui::Range& range);
+  // Marks the given range within |text_| with style defined by |style_info|.
+  // |range| must be contained in |text_|.
+  void AddStyleRange(const ui::Range& range, const RangeStyleInfo& style_info);
 
   // View implementation:
   virtual gfx::Insets GetInsets() const OVERRIDE;
   virtual int GetHeightForWidth(int w) OVERRIDE;
   virtual void Layout() OVERRIDE;
 
   // LinkListener implementation:
   virtual void LinkClicked(Link* source, int event_flags) OVERRIDE;
 
  private:
-  struct LinkRange {
-    explicit LinkRange(const ui::Range& range) : range(range) {}
-    ~LinkRange() {}
+  struct StyleRange {
+    StyleRange(const ui::Range& range,
+               const RangeStyleInfo& style_info)
+        : range(range),
+          style_info(style_info) {
+    }
+    ~StyleRange() {}
 
-    bool operator<(const LinkRange& other) const;
+    bool operator<(const StyleRange& other) const;
 
     ui::Range range;
+    RangeStyleInfo style_info;
   };
 
   // Calculates how to layout child views, creates them and sets their size
   // and position. |width| is the horizontal space, in pixels, that the view
   // has to work with. If |dry_run| is true, the view hierarchy is not touched.
   // The return value is the height in pixels.
   int CalculateAndDoLayout(int width, bool dry_run);
 
   // The text to display.
   string16 text_;
 
   // The listener that will be informed of link clicks.
   StyledLabelListener* listener_;
 
   // The ranges that should be linkified, sorted by start position.
-  std::priority_queue<LinkRange> link_ranges_;
+  std::priority_queue<StyleRange> style_ranges_;
 
-  // A mapping from Link* control to the range it corresponds to in |text_|.
-  std::map<Link*, ui::Range> link_targets_;
+  // A mapping from a view to the range it corresponds to in |text_|. Only views
+  // that correspond to ranges with is_link style set will be added to the map.
+  std::map<View*, ui::Range> link_targets_;
 
   // This variable saves the result of the last GetHeightForWidth call in order
   // to avoid repeated calculation.
   gfx::Size calculated_size_;
 
   DISALLOW_COPY_AND_ASSIGN(StyledLabel);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_STYLED_LABEL_H_