ui/message_center/views/bounded_label.h

   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 FontList;
  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 base::string16& text, const gfx::FontList& font_list);
  37   BoundedLabel(const base::string16& text);
  38   ~BoundedLabel() override;
  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   void SetText(const base::string16& text);  // Additionally clears caches.
  44
  45   int GetLineHeight() const;
  46   int GetLineLimit() const;
  47
  48   // Pass in a -1 width to use the preferred width, a -1 limit to skip limits.
  49   int GetLinesForWidthAndLimit(int width, int limit);
  50   gfx::Size GetSizeForWidthAndLines(int width, int lines);
  51
  52   // views::View:
  53   int GetBaseline() const override;
  54   gfx::Size GetPreferredSize() const override;
  55   int GetHeightForWidth(int width) const override;
  56   void OnPaint(gfx::Canvas* canvas) override;
  57   bool CanProcessEventsWithinSubtree() const override;
  58   void GetAccessibleState(ui::AXViewState* state) override;
  59
  60  protected:
  61   // Overridden from views::View.
  62   void OnBoundsChanged(const gfx::Rect& previous_bounds) override;
  63   void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
  64
  65  private:
  66   friend class test::BoundedLabelTest;
  67
  68   base::string16 GetWrappedTextForTest(int width, int lines);
  69
  70   scoped_ptr<InnerBoundedLabel> label_;
  71   int line_limit_;
  72
  73   DISALLOW_COPY_AND_ASSIGN(BoundedLabel);
  74 };
  75
  76 }  // namespace message_center
  77
  78 #endif  // UI_MESSAGE_CENTER_BOUNDED_LABEL_H_