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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef UI_MESSAGE_CENTER_BOUNDED_LABEL_H_
      6 #define UI_MESSAGE_CENTER_BOUNDED_LABEL_H_
      7 
      8 #include <list>
      9 #include <map>
     10 
     11 #include "base/memory/scoped_ptr.h"
     12 #include "third_party/skia/include/core/SkColor.h"
     13 #include "ui/message_center/message_center_export.h"
     14 #include "ui/views/view.h"
     15 
     16 namespace gfx {
     17 class Font;
     18 }
     19 
     20 namespace message_center {
     21 
     22 class InnerBoundedLabel;
     23 
     24 namespace test {
     25 class BoundedLabelTest;
     26 }
     27 
     28 // BoundedLabels display left aligned text up to a maximum number of lines, with
     29 // ellipsis at the end of the last line for any omitted text. BoundedLabel is a
     30 // direct subclass of views::Views rather than a subclass of views::Label
     31 // to avoid exposing some of views::Label's methods that can't be made to work
     32 // with BoundedLabel. See the description of InnerBoundedLabel in the
     33 // bounded_label.cc file for details.
     34 class MESSAGE_CENTER_EXPORT BoundedLabel : public views::View {
     35  public:
     36   BoundedLabel(const string16& text, gfx::Font font);
     37   BoundedLabel(const string16& text);
     38   virtual ~BoundedLabel();
     39 
     40   void SetColors(SkColor textColor, SkColor backgroundColor);
     41   void SetLineHeight(int height);  // Pass in 0 for default height.
     42   void SetLineLimit(int lines);  // Pass in -1 for no limit.
     43 
     44   int GetLineHeight() const;
     45   int GetLineLimit() const;
     46 
     47   // Pass in a -1 width to use the preferred width, a -1 limit to skip limits.
     48   int GetLinesForWidthAndLimit(int width, int limit);
     49   gfx::Size GetSizeForWidthAndLines(int width, int lines);
     50 
     51   // Overridden from views::View.
     52   virtual int GetBaseline() const OVERRIDE;
     53   virtual gfx::Size GetPreferredSize() OVERRIDE;
     54   virtual int GetHeightForWidth(int width) OVERRIDE;
     55   virtual void Paint(gfx::Canvas* canvas) OVERRIDE;
     56   virtual bool HitTestRect(const gfx::Rect& rect) const OVERRIDE;
     57   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
     58 
     59  protected:
     60   // Overridden from views::View.
     61   virtual void OnBoundsChanged(const gfx::Rect& previous_bounds) OVERRIDE;
     62   virtual void OnNativeThemeChanged(const ui::NativeTheme* theme) OVERRIDE;
     63 
     64  private:
     65   friend class test::BoundedLabelTest;
     66 
     67   string16 GetWrappedTextForTest(int width, int lines);
     68 
     69   scoped_ptr<InnerBoundedLabel> label_;
     70   int line_limit_;
     71 
     72   DISALLOW_COPY_AND_ASSIGN(BoundedLabel);
     73 };
     74 
     75 }  // namespace message_center
     76 
     77 #endif  // UI_MESSAGE_CENTER_BOUNDED_LABEL_H_
     78