sd/source/ui/slidesorter/inc/view/SlsFontProvider.hxx

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  30
  31 #ifndef SD_SLIDESORTER_VIEW_FONT_PROVIDER_HXX
  32 #define SD_SLIDESORTER_VIEW_FONT_PROVIDER_HXX
  33
  34 #include "tools/SdGlobalResourceContainer.hxx"
  35
  36 #include <boost/shared_ptr.hpp>
  37 #include <vcl/mapmod.hxx>
  38
  39 class Font;
  40 class OutputDevice;
  41 class VclWindowEvent;
  42
  43 namespace sd { namespace slidesorter { namespace view {
  44
  45 /** This simple singleton class provides fonts that are scaled so that they
  46     have a fixed height on the given device regardless of its map mode.
  47 */
  48 class FontProvider
  49     : public SdGlobalResource
  50 {
  51 public:
  52     typedef ::boost::shared_ptr<Font> SharedFontPointer;
  53
  54     /** Return the single instance of this class.  Throws a RuntimeException
  55         when no instance can be created.
  56     */
  57     static FontProvider& Instance (void);
  58
  59     /** Return a font that is scaled according to the current map mode of
  60         the given device.  Repeated calls with a device, not necessarily the
  61         same device, with the same map mode will return the same font.  The
  62         first call with a different map mode will release the old font and
  63         create a new one that is correctly scaled.
  64     */
  65     SharedFontPointer GetFont (const OutputDevice& rDevice);
  66
  67     /** Call this method to tell an object to release its currently used
  68         font.  The next call to GetFont() will then create a new one.
  69         Typically called after a DataChange event when for instance a system
  70         font has been modified.
  71     */
  72     void Invalidate (void);
  73
  74 private:
  75     static FontProvider* mpInstance;
  76
  77     /** The font that was created by a previous call to GetFont().  It is
  78         replaced by another one only when GetFont() is called with a device
  79         with a different map mode or by a call to Invalidate().
  80     */
  81     SharedFontPointer maFont;
  82     /** The mape mode for which maFont was created.
  83     */
  84     MapMode maMapMode;
  85
  86     FontProvider (void);
  87     virtual ~FontProvider (void);
  88
  89     // Copy constructor is not implemented.
  90     FontProvider (const FontProvider&);
  91     // Assignment operator is not implemented.
  92     FontProvider& operator= (const FontProvider&);
  93 };
  94
  95 } } } // end of namespace ::sd::slidesorter::view
  96
  97 #endif