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Eclipse Platform
Release 3.0

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org.eclipse.jface.action
Class Action

java.lang.Object
  org.eclipse.jface.action.Action

All Implemented Interfaces:

IAction

Direct Known Subclasses:

BaseSelectionListenerAction, BooleanPropertyAction, ClearOutputAction, CreateProjectAction, FrameAction, GlobalBuildAction, LaunchAction, LaunchAsAction, NavigationAction, NewExampleAction, NewProjectAction, NewWizardAction, OpenCheatSheetAction, OpenInNewWindowAction, OpenLaunchDialogAction, PartEventAction, QuickStartAction, ResourceAction, SelectionProviderAction, TextNavigationAction, TextViewerAction

public abstract class Action

extends Object

implements IAction

The standard abstract implementation of an action.

Subclasses must implement the IAction.run method to carry out the action's semantics.

Field Summary

Fields inherited from interface org.eclipse.jface.action.IAction

AS_CHECK_BOX, AS_DROP_DOWN_MENU, AS_PUSH_BUTTON, AS_RADIO_BUTTON, AS_UNSPECIFIED, CHECKED, DESCRIPTION, ENABLED, IMAGE, RESULT, TEXT, TOOL_TIP_TEXT

Constructor Summary

protected	Action() Creates a new action with no text and no image.
protected	Action(String text) Creates a new action with the given text and no image.
protected	Action(String text, ImageDescriptor image) Creates a new action with the given text and image.
protected	Action(String text, int style) Creates a new action with the given text and style.

Method Summary

void	addPropertyChangeListener(IPropertyChangeListener listener) Adds a property change listener to this action.
static String	convertAccelerator(int keyCode) Converts an accelerator key code to a string representation.
static int	convertAccelerator(String acceleratorText) Parses the given accelerator text, and converts it to an accelerator key code.
static int	findKeyCode(String token) Maps a standard keyboard key name to an SWT key code.
static String	findKeyString(int keyCode) Maps an SWT key code to a standard keyboard key name.
static int	findModifier(String token) Maps standard keyboard modifier key names to the corresponding SWT modifier bit.
static String	findModifierString(int keyCode) Returns a string representation of an SWT modifier bit (SWT.CTRL, SWT.ALT, SWT.SHIFT, and SWT.COMMAND).
protected void	firePropertyChange(PropertyChangeEvent event) Notifies any property change listeners that a property has changed.
protected void	firePropertyChange(String propertyName, Object oldValue, Object newValue) Notifies any property change listeners that a property has changed.
int	getAccelerator() Returns the accelerator keycode for this action.
String	getActionDefinitionId() Returns the action definition id of this action.
String	getDescription() Returns the action's description if it has one.
ImageDescriptor	getDisabledImageDescriptor() Returns the disabled image for this action as an image descriptor.
HelpListener	getHelpListener() Returns a help listener for this action.
ImageDescriptor	getHoverImageDescriptor() Returns the hover image for this action as an image descriptor.
String	getId() Returns a unique identifier for this action, or null if it has none.
ImageDescriptor	getImageDescriptor() Returns the image for this action as an image descriptor.
IMenuCreator	getMenuCreator() Returns the menu creator for this action.
int	getStyle() Return this action's style.
String	getText() Returns the text for this action.
String	getToolTipText() Returns the tool tip text for this action.
boolean	isChecked() Returns the checked status of this action.
boolean	isEnabled() Returns whether this action is enabled.
void	notifyResult(boolean success) Reports the outcome of the running of this action via the IAction.RESULT property.
static String	removeAcceleratorText(String text) Convenience method for removing any optional accelerator text from the given string.
static String	removeMnemonics(String text) Convenience method for removing any mnemonics from the given string.
void	removePropertyChangeListener(IPropertyChangeListener listener) Removes the given listener from this action.
void	run() The default implementation of this IAction method does nothing.
void	runWithEvent(Event event) The default implementation of this IAction method ignores the event argument, and simply calls run().
void	setAccelerator(int keycode) Sets the accelerator keycode that this action maps to.
void	setActionDefinitionId(String id) Sets the action definition id of this action.
void	setChecked(boolean checked) Sets the checked status of this action.
void	setDescription(String text) Sets this action's description.
void	setDisabledImageDescriptor(ImageDescriptor newImage) Sets the disabled image for this action, as an image descriptor.
void	setEnabled(boolean enabled) Sets the enabled state of this action.
void	setHelpListener(HelpListener listener) Sets a help listener for this action.
void	setHoverImageDescriptor(ImageDescriptor newImage) Sets the hover image for this action, as an image descriptor.
void	setId(String id) Sets the unique identifier for this action.
void	setImageDescriptor(ImageDescriptor newImage) Sets the image for this action, as an image descriptor.
void	setMenuCreator(IMenuCreator creator) Sets the menu creator for this action.
void	setText(String text) Sets the text for this action.
void	setToolTipText(String toolTipText) Sets the tool tip text for this action.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Action

protected Action()

Creates a new action with no text and no image.

Configure the action later using the set methods.

Action

protected Action(String text)

Creates a new action with the given text and no image. Calls the zero-arg constructor, then setText.

Parameters:

text - the string used as the text for the action, or null if there is no text

See Also:

setText(java.lang.String)

Action

protected Action(String text,
                 ImageDescriptor image)

Creates a new action with the given text and image. Calls the zero-arg constructor, then setText and setImageDescriptor.

Parameters:

text - the action's text, or null if there is no text

image - the action's image, or null if there is no image

See Also:

setText(java.lang.String), setImageDescriptor(org.eclipse.jface.resource.ImageDescriptor)

Action

protected Action(String text,
                 int style)

Creates a new action with the given text and style.

Parameters:

text - the action's text, or null if there is no text

style - one of AS_PUSH_BUTTON, AS_CHECK_BOX, AS_DROP_DOWN_MENU, AS_RADIO_BUTTON, and AS_UNSPECIFIED.

Method Detail

addPropertyChangeListener

public void addPropertyChangeListener(IPropertyChangeListener listener)

Description copied from interface: IAction

Adds a property change listener to this action. Has no effect if an identical listener is already registered.

Specified by:

addPropertyChangeListener in interface IAction

Parameters:

listener - a property change listener

convertAccelerator

public static int convertAccelerator(String acceleratorText)

Parses the given accelerator text, and converts it to an accelerator key code.

Parameters:

acceleratorText - the accelerator text

Returns:

the SWT key code, or 0 if there is no accelerator

convertAccelerator

public static String convertAccelerator(int keyCode)

Converts an accelerator key code to a string representation.

Parameters:

keyCode - the key code to be translated

Returns:

a string representation of the key code

findKeyCode

public static int findKeyCode(String token)

Maps a standard keyboard key name to an SWT key code. Key names are converted to upper case before comparison. If the key name is a single letter, for example "S", its character code is returned.

The following key names are known (case is ignored):

• "BACKSPACE"
• "TAB"
• "RETURN"
• "ENTER"
• "ESC"
• "ESCAPE"
• "DELETE"
• "SPACE"
• "ARROW_UP", "ARROW_DOWN", "ARROW_LEFT", and "ARROW_RIGHT"
• "PAGE_UP" and "PAGE_DOWN"
• "HOME"
• "END"
• "INSERT"
• "F1", "F2" through "F12"

Parameters:

token - the key name

Returns:

the SWT key code, -1 if no match was found

See Also:

SWT

findKeyString

public static String findKeyString(int keyCode)

Maps an SWT key code to a standard keyboard key name. The key code is stripped of modifiers (SWT.CTRL, SWT.ALT, SWT.SHIFT, and SWT.COMMAND). If the key code is not an SWT code (for example if it a key code for the key 'S'), a string containing a character representation of the key code is returned.

Parameters:

keyCode - the key code to be translated

Returns:

the string representation of the key code

Since:

2.0

See Also:

SWT

findModifier

public static int findModifier(String token)

Maps standard keyboard modifier key names to the corresponding SWT modifier bit. The following modifier key names are recognized (case is ignored): "CTRL", "SHIFT", "ALT", and "COMMAND". The given modifier key name is converted to upper case before comparison.

Parameters:

token - the modifier key name

Returns:

the SWT modifier bit, or 0 if no match was found

See Also:

SWT

findModifierString

public static String findModifierString(int keyCode)

Returns a string representation of an SWT modifier bit (SWT.CTRL, SWT.ALT, SWT.SHIFT, and SWT.COMMAND). Returns null if the key code is not an SWT modifier bit.

Parameters:

keyCode - the SWT modifier bit to be translated

Returns:

the string representation of the SWT modifier bit, or null if the key code was not an SWT modifier bit

Since:

2.0

See Also:

SWT

firePropertyChange

protected void firePropertyChange(String propertyName,
                                  Object oldValue,
                                  Object newValue)

Notifies any property change listeners that a property has changed. Only listeners registered at the time this method is called are notified. This method avoids creating an event object if there are no listeners registered, but calls firePropertyChange(PropertyChangeEvent) if there are.

Parameters:

propertyName - the name of the property that has changed

oldValue - the old value of the property, or null if none

newValue - the new value of the property, or null if none

See Also:

IPropertyChangeListener.propertyChange(org.eclipse.jface.util.PropertyChangeEvent)

firePropertyChange

protected void firePropertyChange(PropertyChangeEvent event)

Notifies any property change listeners that a property has changed. Only listeners registered at the time this method is called are notified.

Parameters:

event - the property change event

See Also:

IPropertyChangeListener.propertyChange(org.eclipse.jface.util.PropertyChangeEvent)

getAccelerator

public int getAccelerator()

Description copied from interface: IAction

Returns the accelerator keycode for this action. The result is the bit-wise OR of zero or more modifier masks and a key, as explained in MenuItem.getAccelerator.

Specified by:

getAccelerator in interface IAction

Returns:

the accelerator keycode

See Also:

MenuItem.getAccelerator()

getActionDefinitionId

public String getActionDefinitionId()

Description copied from interface: IAction

Returns the action definition id of this action.

Specified by:

getActionDefinitionId in interface IAction

Returns:

the action definition id of this action, or null if none

getDescription

public String getDescription()

Description copied from interface: IAction

Returns the action's description if it has one. Otherwise it returns getToolTipText().

Specified by:

getDescription in interface IAction

getDisabledImageDescriptor

public ImageDescriptor getDisabledImageDescriptor()

Description copied from interface: IAction

Returns the disabled image for this action as an image descriptor.

This method is associated with the IMAGE property; property change events are reported when its value changes.

Specified by:

getDisabledImageDescriptor in interface IAction

Returns:

the image, or null if this action has no image

See Also:

IAction.IMAGE

getHelpListener

public HelpListener getHelpListener()

Description copied from interface: IAction

Returns a help listener for this action.

Specified by:

getHelpListener in interface IAction

Returns:

a help listener for this action

getHoverImageDescriptor

public ImageDescriptor getHoverImageDescriptor()

Description copied from interface: IAction

Returns the hover image for this action as an image descriptor.

Hover images will be used on platforms that support changing the image when the user hovers over the item. This method is associated with the IMAGE property; property change events are reported when its value changes.

Specified by:

getHoverImageDescriptor in interface IAction

Returns:

the image, or null if this action has no image

See Also:

IAction.IMAGE

getId

public String getId()

Description copied from interface: IAction

Returns a unique identifier for this action, or null if it has none.

Specified by:

getId in interface IAction

Returns:

the action id, or null if none

getImageDescriptor

public ImageDescriptor getImageDescriptor()

Description copied from interface: IAction

Returns the image for this action as an image descriptor.

This method is associated with the IMAGE property; property change events are reported when its value changes.

Specified by:

getImageDescriptor in interface IAction

Returns:

the image, or null if this action has no image

See Also:

IAction.IMAGE

getMenuCreator

public IMenuCreator getMenuCreator()

Description copied from interface: IAction

Returns the menu creator for this action.

Specified by:

getMenuCreator in interface IAction

Returns:

the menu creator, or null if none

getStyle

public int getStyle()

Description copied from interface: IAction

Return this action's style.

Specified by:

getStyle in interface IAction

Returns:

one of AS_PUSH_BUTTON, AS_CHECK_BOX, AS_RADIO_BUTTON and AS_DROP_DOWN_MENU.

getText

public String getText()

Description copied from interface: IAction

Returns the text for this action.

This method is associated with the TEXT property; property change events are reported when its value changes.

Specified by:

getText in interface IAction

Returns:

the text, or null if none

See Also:

IAction.TEXT

getToolTipText

public String getToolTipText()

Description copied from interface: IAction

Returns the tool tip text for this action.

This method is associated with the TOOL_TIP_TEXT property; property change events are reported when its value changes.

Specified by:

getToolTipText in interface IAction

Returns:

the tool tip text, or null if none

See Also:

IAction.TOOL_TIP_TEXT

isChecked

public boolean isChecked()

Description copied from interface: IAction

Returns the checked status of this action. Applicable only if the style is AS_CHECK_BOX or AS_RADIO_BUTTON.

This method is associated with the CHECKED property; property change events are reported when its value changes.

Specified by:

isChecked in interface IAction

Returns:

the checked status

See Also:

IAction.CHECKED

isEnabled

public boolean isEnabled()

Description copied from interface: IAction

Returns whether this action is enabled.

This method is associated with the ENABLED property; property change events are reported when its value changes.

Specified by:

isEnabled in interface IAction

Returns:

true if enabled, and false if disabled

See Also:

IAction.ENABLED

removeAcceleratorText

public static String removeAcceleratorText(String text)

Convenience method for removing any optional accelerator text from the given string. The accelerator text appears at the end of the text, and is separated from the main part by a single tab character '\t'.

Parameters:

text - the text

Returns:

the text sans accelerator

removeMnemonics

public static String removeMnemonics(String text)

Convenience method for removing any mnemonics from the given string. For example, removeMnemonics("&Open") will return "Open".

Parameters:

text - the text

Returns:

the text sans mnemonics

Since:

3.0

removePropertyChangeListener

public void removePropertyChangeListener(IPropertyChangeListener listener)

Description copied from interface: IAction

Removes the given listener from this action. Has no effect if an identical listener is not registered.

Specified by:

removePropertyChangeListener in interface IAction

Parameters:

listener - a property change listener

run

public void run()

The default implementation of this IAction method does nothing. Subclasses should override this method if they do not need information from the triggering event, or override runWithEvent(Event) if they do.

Specified by:

run in interface IAction

runWithEvent

public void runWithEvent(Event event)

The default implementation of this IAction method ignores the event argument, and simply calls run(). Subclasses should override this method if they need information from the triggering event, or override run() if not.

Specified by:

runWithEvent in interface IAction

Parameters:

event - the SWT event which triggered this action being run

Since:

2.0

setActionDefinitionId

public void setActionDefinitionId(String id)

Description copied from interface: IAction

Sets the action definition id of this action.

Specified by:

setActionDefinitionId in interface IAction

Parameters:

id - the action definition id

setChecked

public void setChecked(boolean checked)

Description copied from interface: IAction

Sets the checked status of this action. Applicable for the styles AS_CHECK_BOX or AS_RADIO_BUTTON.

Fires a property change event for the CHECKED property if the checked status actually changes as a consequence.

Specified by:

setChecked in interface IAction

Parameters:

checked - the new checked status

See Also:

IAction.CHECKED

setDescription

public void setDescription(String text)

Description copied from interface: IAction

Sets this action's description. Typically the description is shown as a (longer) help text in the status line.

Fires a property change event for the DESCRIPTION property if the description actually changes as a consequence.

Specified by:

setDescription in interface IAction

Parameters:

text - the description, or null to clear the description

See Also:

IAction.DESCRIPTION

setDisabledImageDescriptor

public void setDisabledImageDescriptor(ImageDescriptor newImage)

Description copied from interface: IAction

Sets the disabled image for this action, as an image descriptor.

Disabled images will be used on platforms that support changing the image when the item is disabled.Fires a property change event for the IMAGE property if the image actually changes as a consequence.

Specified by:

setDisabledImageDescriptor in interface IAction

Parameters:

newImage - the image, or null if this action should not have an image

See Also:

IAction.IMAGE

setEnabled

public void setEnabled(boolean enabled)

Description copied from interface: IAction

Sets the enabled state of this action.

When an action is in the enabled state, the control associated with it is active; triggering it will end up inkoking this action's run method.

Fires a property change event for the ENABLED property if the enabled state actually changes as a consequence.

Specified by:

setEnabled in interface IAction

Parameters:

enabled - true to enable, and false to disable

See Also:

IAction.ENABLED

setHelpListener

public void setHelpListener(HelpListener listener)

Description copied from interface: IAction

Sets a help listener for this action.

Specified by:

setHelpListener in interface IAction

Parameters:

listener - a help listener for this action

setHoverImageDescriptor

public void setHoverImageDescriptor(ImageDescriptor newImage)

Description copied from interface: IAction

Sets the hover image for this action, as an image descriptor.

Hover images will be used on platforms that support changing the image when the user hovers over the item.Fires a property change event for the IMAGE property if the image actually changes as a consequence.

Specified by:

setHoverImageDescriptor in interface IAction

Parameters:

newImage - the image, or null if this action should not have an image

See Also:

IAction.IMAGE

setId

public void setId(String id)

Description copied from interface: IAction

Sets the unique identifier for this action. This is used to identify actions when added to a contribution manager. It should be set when the action is created. It should not be modified once the action is part of an action contribution item.

Specified by:

setId in interface IAction

Parameters:

id - the action id

See Also:

ActionContributionItem, IContributionItem.getId()

setImageDescriptor

public void setImageDescriptor(ImageDescriptor newImage)

Description copied from interface: IAction

Sets the image for this action, as an image descriptor.

Fires a property change event for the IMAGE property if the image actually changes as a consequence.

Specified by:

setImageDescriptor in interface IAction

Parameters:

newImage - the image, or null if this action should not have an image

See Also:

IAction.IMAGE

setMenuCreator

public void setMenuCreator(IMenuCreator creator)

Sets the menu creator for this action.

Note that if this method is called, it overrides the check status.

Specified by:

setMenuCreator in interface IAction

Parameters:

creator - the menu creator, or null if none

setText

public void setText(String text)

Sets the text for this action.

Fires a property change event for the TEXT property if the text actually changes as a consequence.

The accelerator is identified by the last index of a tab character. If there are no tab characters, then it is identified by the last index of a '@' character. If neither, then there is no accelerator text. Note that if you want to insert a '@' character into the text (but no accelerator, you can simply insert a '@' or a tab at the end of the text.

Specified by:

setText in interface IAction

Parameters:

text - the text, or null if none

See Also:

IAction.TEXT, findModifier(java.lang.String), findKeyCode(java.lang.String)

setToolTipText

public void setToolTipText(String toolTipText)

Sets the tool tip text for this action.

Fires a property change event for the TOOL_TIP_TEXT property if the tool tip text actually changes as a consequence.

Specified by:

setToolTipText in interface IAction

Parameters:

toolTipText - the tool tip text, or null if none

See Also:

IAction.TOOL_TIP_TEXT

setAccelerator

public void setAccelerator(int keycode)

Description copied from interface: IAction

Sets the accelerator keycode that this action maps to. This is a bitwise OR of zero or more SWT key modifier masks (i.e. SWT.CTRL or SWT.ALT) and a character code. For example, for Ctrl+Z, use SWT.CTRL | 'Z'. Use 0 for no accelerator.

This method should no longer be used for actions in the Eclipse workbench. IWorkbenchCommandSupport and IWorkbenchContextSupport provide all the functionality required for key bindings. If you set an accelerator using this method, then it will not work in the workbench if it conflicts any existing key binding, or if there is a different key binding defined for this action's definition id. The definition id should be used instead -- referring to the command in the workbench from which the key binding should be retrieved.

Specified by:

setAccelerator in interface IAction

Parameters:

keycode - the keycode to be accepted.

notifyResult

public final void notifyResult(boolean success)

Reports the outcome of the running of this action via the IAction.RESULT property.

Parameters:

success - true if the action succeeded and false if the action failed or was not completed

Since:

3.0

See Also:

IAction.RESULT