Package org.eclipse.jface.resource

Class FontRegistry

java.lang.Object
org.eclipse.core.commands.common.EventManager
org.eclipse.jface.resource.ResourceRegistry
org.eclipse.jface.resource.FontRegistry
@NoExtend public class FontRegistry extends ResourceRegistry
A font registry maintains a mapping between symbolic font names and SWT fonts.

A font registry owns all of the font objects registered with it, and automatically disposes of them when the SWT Display that creates the fonts is disposed. Because of this, clients do not need to (indeed, must not attempt to) dispose of font objects themselves.

A special constructor is provided for populating a font registry from a property files using the standard Java resource bundle mechanism.

Methods are provided for registering listeners that will be kept apprised of changes to list of registered fonts.

Clients may instantiate this class (it was not designed to be subclassed).

Since 3.0 this class extends ResourceRegistry.

  • Field Details

    • displayRunnable

      protected Runnable displayRunnable
      Runnable that cleans up the manager on disposal of the display.

  • Constructor Details

    • FontRegistry

      public FontRegistry()
      Creates an empty font registry.

      There must be an SWT Display created in the current thread before calling this method.

    • FontRegistry

      public FontRegistry(String location, ClassLoader loader) throws MissingResourceException
      Creates a font registry and initializes its content from a property file.

      There must be an SWT Display created in the current thread before calling this method.

      The OS name (retrieved using System.getProperty("os.name")) is converted to lowercase, purged of whitespace, and appended as suffix (separated by an underscore '_') to the given location string to yield the base name of a resource bundle acceptable to ResourceBundle.getBundle. The standard Java resource bundle mechanism is then used to locate and open the appropriate properties file, taking into account locale specific variations.

      For example, on the Windows 2000 operating system the location string "com.example.myapp.Fonts" yields the base name "com.example.myapp.Fonts_windows2000". For the US English locale, this further elaborates to the resource bundle name "com.example.myapp.Fonts_windows2000_en_us".

      If no appropriate OS-specific resource bundle is found, the process is repeated using the location as the base bundle name.

      The property file contains entries that look like this: 

              textfont.0=MS Sans Serif-regular-10
        textfont.1=Times New Roman-regular-10

        titlefont.0=MS Sans Serif-regular-12
        titlefont.1=Times New Roman-regular-12

      Each entry maps a symbolic font names (the font registry keys) with a ".n" suffix to standard font names on the right. The suffix indicated order of preference: ".0" indicates the first choice, ".1" indicates the second choice, and so on.

      The following example shows how to use the font registry: 
        FontRegistry registry = new FontRegistry("com.example.myapp.fonts");
  Font font = registry.get("textfont");
  control.setFont(font);
  ...
      Parameters:
      location - the name of the resource bundle
      loader - the ClassLoader to use to find the resource bundle
      Throws:
      MissingResourceException - if the resource bundle cannot be found
      Since:
      2.1

    • FontRegistry

      public FontRegistry(String location) throws MissingResourceException
      Load the FontRegistry using the ClassLoader from the PlatformUI plug-in

      This method should only be called from the UI thread. If you are not on the UI thread then wrap the call with a PlatformUI.getWorkbench().getDisplay().synchExec() in order to guarantee the correct result. Failure to do this may result in an SWTException being thrown.

      Parameters:
      location - the location to read the resource bundle from
      Throws:
      MissingResourceException - Thrown if a resource is missing

    • FontRegistry

      public FontRegistry(Display display)
      Creates an empty font registry.
      Parameters:
      display - the Display

    • FontRegistry

      public FontRegistry(Display display, boolean cleanOnDisplayDisposal)
      Creates an empty font registry.
      Parameters:
      display - the Display
      cleanOnDisplayDisposal - whether all fonts allocated by this FontRegistry should be disposed when the display is disposed
      Since:
      3.1

  • Method Details

    • bestData

      @Deprecated public FontData bestData(FontData[] fonts, Display display)
      Deprecated.
      use bestDataArray in order to support Motif multiple entry fonts.
      Find the first valid fontData in the provided list. If none are valid return the first one regardless. If the list is empty return null. Return null if one cannot be found.
      Parameters:
      fonts - the font list
      display - the display used
      Returns:
      the font data of the like describe above

    • bestDataArray

      @Deprecated public FontData[] bestDataArray(FontData[] fonts, Display display)
      Deprecated.
      use filterData in order to preserve multiple entry fonts on Motif
      Find the first valid fontData in the provided list. If none are valid return the first one regardless. If the list is empty return null.
      Parameters:
      fonts - list of fonts
      display - the display
      Returns:
      font data like described above

    • filterData

      public FontData[] filterData(FontData[] fonts, Display display)
      Removes from the list all fonts that do not exist in this system. If none are valid, return the first irregardless. If the list is empty return null.
      Parameters:
      fonts - the fonts to check
      display - the display to check against
      Returns:
      the list of fonts that have been found on this system
      Since:
      3.1

    • defaultFont

      public Font defaultFont()
      Returns the default font data. Creates it if necessary.

      This method should only be called from the UI thread. If you are not on the UI thread then wrap the call with a PlatformUI.getWorkbench().getDisplay().synchExec() in order to guarantee the correct result. Failure to do this may result in an SWTException being thrown.

      Returns:
      Font

    • getDescriptor

      public FontDescriptor getDescriptor(String symbolicName)
      Returns the font descriptor for the font with the given symbolic font name. Returns the default font if there is no special value associated with that name
      Parameters:
      symbolicName - symbolic font name
      Returns:
      the font descriptor (never null)
      Since:
      3.3

    • getFontData

      public FontData[] getFontData(String symbolicName)
      Returns the font data associated with the given symbolic font name. Returns the default font data if there is no special value associated with that name.
      Parameters:
      symbolicName - symbolic font name
      Returns:
      the font

    • get

      public Font get(String symbolicName)
      Returns the font associated with the given symbolic font name. Returns the default font if there is no special value associated with that name.

      This method should only be called from the UI thread. If you are not on the UI thread then wrap the call with a PlatformUI.getWorkbench().getDisplay().synchExec() in order to guarantee the correct result. Failure to do this may result in an SWTException being thrown.

      Parameters:
      symbolicName - symbolic font name
      Returns:
      the font

    • getBold

      public Font getBold(String symbolicName)
      Returns the bold font associated with the given symbolic font name. Returns the bolded default font if there is no special value associated with that name.

      This method should only be called from the UI thread. If you are not on the UI thread then wrap the call with a PlatformUI.getWorkbench().getDisplay().synchExec() in order to guarantee the correct result. Failure to do this may result in an SWTException being thrown.

      Parameters:
      symbolicName - symbolic font name
      Returns:
      the font
      Since:
      3.0

    • getItalic

      public Font getItalic(String symbolicName)
      Returns the italic font associated with the given symbolic font name. Returns the italic default font if there is no special value associated with that name.

      This method should only be called from the UI thread. If you are not on the UI thread then wrap the call with a PlatformUI.getWorkbench().getDisplay().synchExec() in order to guarantee the correct result. Failure to do this may result in an SWTException being thrown.

      Parameters:
      symbolicName - symbolic font name
      Returns:
      the font
      Since:
      3.0

    • getKeySet

      public Set<String> getKeySet()
      Specified by:
      getKeySet in class ResourceRegistry
      Returns:
      the set of keys this manager knows about. This collection should be immutable.

    • hasValueFor

      public boolean hasValueFor(String fontKey)
      Description copied from class: ResourceRegistry
      Return whether or not the receiver has a value for the supplied key.
      Specified by:
      hasValueFor in class ResourceRegistry
      Parameters:
      fontKey - the key
      Returns:
      true if there is a value for this key

    • clearCaches

      protected void clearCaches()
      Description copied from class: ResourceRegistry
      Disposes all currently allocated resources.
      Specified by:
      clearCaches in class ResourceRegistry

    • put

      public void put(String symbolicName, FontData[] fontData)
      Adds (or replaces) a font to this font registry under the given symbolic name.

      A property change event is reported whenever the mapping from a symbolic name to a font changes. The source of the event is this registry; the property name is the symbolic font name.

      Parameters:
      symbolicName - the symbolic font name
      fontData - an Array of FontData

    • defaultFontDescriptor

      public FontDescriptor defaultFontDescriptor()
      Returns the font descriptor for the JFace default font.
      Returns:
      the font descriptor for the JFace default font
      Since:
      3.3