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IntegerFieldEditor
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A label and text field for selecting an integer This editor can optionally enforce a value within a range
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A label, list, and group of buttons for selecting zero or more paths The New button opens a directory chooser, while the other buttons manipulate paths already in the list
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A label and series of radio buttons for selecting one of several properties Optionally, the radio buttons can be grouped and displayed in multiple columns
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A label and slider for selecting a range of integer values
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A label and text field for entering a string value
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CHAPTER 12 Preference Pages
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Field editors are designed around the concept of create them and forget them In other words, you create a field editor with all that it needs to know about the preferences it is to represent, and then the field editor, in combination with the FieldEditorPreferencePage, handles the rest Field editors excel at presenting and manipulating simple types of preferences such as strings, integers, colors, and so on If your preferences lend themselves to simple values such as these, then field editors will save you the hassle of writing code to load, display, validate, and store these simple preferences If the data you wish to present is more structured and complex, then you may need to build your preference page without field editors, subclassing PreferencePage rather than FieldEditorPreferencePage If you need to interact with a field editor directly or to create a new type of field editor, here are some of the field editor methods you might need to know:
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adjustForNumColumns(int) Adjusts the horizontal span of the field
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editor s basic controls
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dispose() Cleans up any native resources allocated by this editor doFillIntoGrid(Composite, int) Creates the controls comprising
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doLoad() Initializes the editor content with the current value from the
preferences store
doLoadDefault() Initializes the editor content with the default value doStore() Saves the current editor value into the preferences store fireStateChanged(String, boolean, boolean) Informs the field editor s listener, if it has one, about a change to Boolean-valued properties Does nothing if the old and new values are the same fireValueChanged(String, Object, Object) Informs the field editor s listener, if it has one, about a change to a property getLabelControl() Returns the label that is part of the editor or null if none getLabelControl(Composite) Returns the label that is part of the editor Creates the label if label text has been specified either in the constructor or the setLabelText() method getLabelText() Returns the label text specified either in the constructor or the setLabelText() method
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122 Preference Page APIs
getNumberOfControls() Returns the number of controls comprising the editor This value is passed to the doFillIntoGrid(Composite, int) method getPreferenceName() Returns the name/key of the preference dis-
played by the editor
getPreferenceStore() Returns the preferences store containing the
preference being edited
isValid() Returns whether the editor s contents are valid Subclasses should override this method along with the presentsDefaultValue() method load() Loads the current value from the preferences store into the editor Subclasses should override the doLoad() method rather than this method loadDefault() Loads the default value into the editor Subclasses should override the doLoadDefault() method rather than this method presentsDefaultValue() Returns whether the editor is currently displaying the default value refreshValidState() Determines whether the editor s content is valid Subclasses should override this method to perform the validation and the isValid() method to return the state setFocus() Sets focus to the editor Subclasses may override this method to set focus to a particular control within the editor setLabelText(String) Sets the text to appear in the label associated
with the editor
setPreferenceName(String) Sets the name of the preference being
displayed by the editor
setPreferenceStore(IPreferenceStore) Sets the preferences store
in which the editor s value is saved
setPresentsDefaultValue(boolean) Sets whether the editor is
displaying the default value
setPropertyChangeListener(IPropertyChangeListener) Sets the property change listener that should be notified via the fireStateChanged() or fireValueChanged() methods when the editor s content has changed
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CHAPTER 12 Preference Pages showErrorMessage(String) Convenient method for displaying an
error message at the top of the preference page
showMessage(String) Convenient method for displaying a message at the top of the preference page store() Saves the editor s current value into the preferences store Subclasses should override doStore() rather than this method
1223 PreferencePage
FieldEditorPreferencePage assumes that all the preferences on the page
are field editors and handles most of the work involved in loading, validating, and saving field editor content For more complex preference pages, you can use PreferencePage, which is the superclass of FieldEditorPreferencePage, instead The downside is that you must do more of the work yourself