Figure 13 5 IPropertyDescriptor hierarchy in Java

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Figure 13 5 IPropertyDescriptor hierarchy
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Instances of PropertyDescriptor are constructed with a property identifier and a display name for the property If an object has many properties, then it s useful to group similar properties visually by calling setCategory() on each descriptor in the group Other useful methods include:
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setAlwaysIncompatible(boolean) Sets a flag indicating whether the property descriptor is to be considered always incompatible with any other property descriptor Setting this flag prevents a property from displaying during multiple selections
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133 Displaying Properties in the Properties View
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setCategory(String) Sets the name of the category to which the property belongs Properties belonging to the same category are grouped together visually This localized string is shown to the user If the category is not set on any of the descriptors, the property will appear at the top level in the Properties view without being grouped If the category is set on at least one descriptor, then any descriptors with an unset category will appear in a miscellaneous category setDescription(String) Sets a brief description of the property The description should be limited to a single line so that it can be displayed in the status line setFilterFlags(String[]) Sets a list of filter types to which the property belongs The user is able to toggle the filters to show/hide properties belonging to a filter type Currently, the only valid value for these flags is IPropertySheetEntryFILTER_ID_EXPERT setHelpContextIds(Object) Sets the help context ID for the property Even though the method name is plural, only a string can be specified, indicating the singular associated help context (see Section 1531, Associating context IDs with items, on page 592) setLabelProvider(ILabelProvider) Sets the label provider for the property The label provider is used to obtain the text (and possible image) for displaying the value of this property setValidator(ICellEditorValidator) Sets the input validator for
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1332 Favorite properties in the Properties view
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For the Favorites product, you want to display the Color property and a Hash Code property Using setAlwaysIncompatible(true), you specify that the Hash Code property should appear in the Properties view only when the Show Advanced Properties option is turned on The Favorites view is already a workbench selection provider (see Section 741, Selection provider, on page 337), so the Properties view is already examining the selected Favorites items All that s left is for BasicFavoriteItem to implement the IPropertySource2 interface
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private static final String COLOR_ID = "favoritecolor"; private static final ColorPropertyDescriptor COLOR_PROPERTY_DESCRIPTOR = new ColorPropertyDescriptor(COLOR_ID, "Color"); private static final String HASH_ID = "favoritehash"; private static final TextPropertyDescriptor HASH_PROPERTY_DESCRIPTOR = new TextPropertyDescriptor(HASH_ID, "Hash Code");
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Properties
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static { HASH_PROPERTY_DESCRIPTORsetCategory("Other"); HASH_PROPERTY_DESCRIPTORsetFilterFlags( new String[] {IPropertySheetEntryFILTER_ID_EXPERT }); HASH_PROPERTY_DESCRIPTORsetAlwaysIncompatible(true); } private static final IPropertyDescriptor[] DESCRIPTORS = { COLOR_PROPERTY_DESCRIPTOR, HASH_PROPERTY_DESCRIPTOR }; public Object getEditableValue() { return this; } public IPropertyDescriptor[] getPropertyDescriptors() { return DESCRIPTORS; } public Object getPropertyValue(Object id) { if (COLOR_IDequals(id)) return getColor()getRGB(); if (HASH_IDequals(id)) return new Integer(hashCode()); return null; } public boolean isPropertyResettable(Object id) { if (COLOR_IDequals(id)) return true; return false; } public boolean isPropertySet(Object id) { if (COLOR_IDequals(id)) return getColor() != getDefaultColor(); if (HASH_IDequals(id)) { // Return true for indicating that hash // does not have a meaningful default value return true; } return false; } public void resetPropertyValue(Object id) { if (COLOR_IDequals(id)) setColor(null); } public void setPropertyValue(Object id, Object value) { if (COLOR_IDequals(id)) setColor(getColor((RGB) value)); }
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Now, when an item is selected in the Favorites view, the Properties view displays the Color property for that item When the Show Advanced Properties option is turned on, the Hash Code property appears (see Figure 13 6)
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134 Property Pages Reused as Preference Pages
Figure 13 6 Properties view showing expert properties
Property Pages Reused as Preference Pages
Since PropertyPage inherits from PreferencePage, with a little work you can reuse a Property page as a Preference page In this case, you want to reuse the FavoriteItemPropertyPage as a Preference page for specifying the Color and comment properties default values To accomplish this, create a new FavoriteDefaultsPreferencePage as a subclass of FavoriteItemwhich implements orgeclipseuiIWorkbenchPropertyPage, PreferencePage and overrides the property accessor methods
public class FavoriteDefaultsPreferencePage extends FavoriteItemPropertyPage implements IWorkbenchPreferencePage { public void init(IWorkbench workbench) { } protected RGB getColorPropertyValue() { return BasicFavoriteItemgetDefaultColor()getRGB(); } protected void setColorPropertyValue(RGB rgb) { BasicFavoriteItemsetDefaultColor( BasicFavoriteItemgetColor(rgb)); } protected String getCommentPropertyValue() { return BasicFavoriteItemgetDefaultComment(); } protected void setCommentPropertyValue(String comment) { BasicFavoriteItemsetDefaultComment(comment); } }
Then, create a new Preference page declaration in the Favorites plug-in manifest (see Section 121, Creating a Preference Page, on page 485) with the following attributes: