org.eclipse.jface.action
Interface IAction

All Known Implementing Classes:

Action, TextNavigationAction

public interface IAction

An action represents the non-UI side of a command which can be triggered by the end user. Actions are typically associated with buttons, menu items, and items in tool bars. The controls for a command are built by some container, which furnished the context where these controls appear and configures them with data from properties declared by the action. When the end user triggers the command via its control, the action's run method is invoked to do the real work.

Actions support a predefined set of properties (and possibly others as well). Clients of an action may register property change listeners so that they get notified whenever the value of a property changes.

Clients should subclass the abstract base class Action to define concrete actions rather than implementing IAction from scratch.

This interface exists only to define the API for actions. It is not intended to be implemented by clients.

See Also:

Action

Field Summary

static int	AS_CHECK_BOX Action style constant (value 2) indicating action is a check box.
static int	AS_DROP_DOWN_MENU Action style constant (value 4) indicating action is a drop down menu.
static int	AS_PUSH_BUTTON Action style constant (value 1) indicating action is a simple push button.
static String	CHECKED Property name of an action's checked status (value "checked").
static String	DESCRIPTION Property name of an action's description (value "description").
static String	ENABLED Property name of an action's enabled state (value "enabled").
static String	IMAGE Property name of an action's image (value "image").
static String	TEXT Property name of an action's text (value "text").
static String	TOOL_TIP_TEXT Property name of an action's tooltip text (value "toolTipText").

Method Summary

void	addPropertyChangeListener(IPropertyChangeListener listener) Adds a property change listener to this action.
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	removePropertyChangeListener(IPropertyChangeListener listener) Removes the given listener from this action.
void	run() Runs this action.
void	runWithEvent(Event event) Runs this action, passing the triggering SWT event.
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 text) Sets the tool tip text for this action.

Field Detail

AS_PUSH_BUTTON

public static final int AS_PUSH_BUTTON

Action style constant (value 1) indicating action is a simple push button.

See Also:

Constant Field Values

AS_CHECK_BOX

public static final int AS_CHECK_BOX

Action style constant (value 2) indicating action is a check box.

See Also:

Constant Field Values

AS_DROP_DOWN_MENU

public static final int AS_DROP_DOWN_MENU

Action style constant (value 4) indicating action is a drop down menu.

See Also:

Constant Field Values

TEXT

public static final String TEXT

Property name of an action's text (value "text").

See Also:

Constant Field Values

ENABLED

public static final String ENABLED

Property name of an action's enabled state (value "enabled").

See Also:

Constant Field Values

IMAGE

public static final String IMAGE

Property name of an action's image (value "image").

See Also:

Constant Field Values

TOOL_TIP_TEXT

public static final String TOOL_TIP_TEXT

Property name of an action's tooltip text (value "toolTipText").

See Also:

Constant Field Values

DESCRIPTION

public static final String DESCRIPTION

Property name of an action's description (value "description"). Typically the description is shown as a (longer) help text in the status line.

See Also:

Constant Field Values

CHECKED

public static final String CHECKED

Property name of an action's checked status (value "checked").

See Also:

Constant Field Values

Method Detail

addPropertyChangeListener

public void addPropertyChangeListener(IPropertyChangeListener listener)

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

Parameters:

listener - a property change listener

getAccelerator

public int getAccelerator()

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.

Returns:

the accelerator keycode

See Also:

MenuItem.getAccelerator()

getActionDefinitionId

public String getActionDefinitionId()

Returns the action definition id of this action.

Returns:

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

Since:

2.0

getDescription

public String getDescription()

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

getDisabledImageDescriptor

public ImageDescriptor getDisabledImageDescriptor()

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.

Returns:

the image, or null if this action has no image

See Also:

IMAGE

getHelpListener

public HelpListener getHelpListener()

Returns a help listener for this action.

Returns:

a help listener for this action

getHoverImageDescriptor

public ImageDescriptor getHoverImageDescriptor()

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.

Returns:

the image, or null if this action has no image

See Also:

IMAGE

getId

public String getId()

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

Returns:

the action id, or null if none

getImageDescriptor

public ImageDescriptor getImageDescriptor()

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.

Returns:

the image, or null if this action has no image

See Also:

IMAGE

getMenuCreator

public IMenuCreator getMenuCreator()

Returns the menu creator for this action.

Returns:

the menu creator, or null if none

getStyle

public int getStyle()

Return this action's style.

Returns:

one of AS_PUSH_BUTTON, AS_CHECK_BOX, and AS_DROP_DOWN.

getText

public String getText()

Returns the text for this action.

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

Returns:

the text, or null if none

See Also:

TEXT

getToolTipText

public String getToolTipText()

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.

Returns:

the tool tip text, or null if none

See Also:

TOOL_TIP_TEXT

isChecked

public boolean isChecked()

Returns the checked status of this action.

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

Returns:

the checked status

See Also:

CHECKED

isEnabled

public boolean isEnabled()

Returns whether this action is enabled.

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

Returns:

true if enabled, and false if disabled

See Also:

ENABLED

removePropertyChangeListener

public void removePropertyChangeListener(IPropertyChangeListener listener)

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

Parameters:

listener - a property change listener

run

public void run()

Runs this action. Each action implementation must define the steps needed to carry out this action. The default implementation of this method in Action does nothing.

runWithEvent

public void runWithEvent(Event event)

Runs this action, passing the triggering SWT event. As of 2.0, ActionContributionItem calls this method instead of run(). The default implementation of this method in Action simply calls run() for backwards compatibility. NOTE: This is experimental API, which may change in the future.

Parameters:

event - the SWT event which triggered this action being run

Since:

2.0

setActionDefinitionId

public void setActionDefinitionId(String id)

Sets the action definition id of this action.

Parameters:

id - the action definition id

Since:

2.0

setChecked

public void setChecked(boolean checked)

Sets the checked status of this action.

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

Parameters:

checked - the new checked status

See Also:

CHECKED

setDescription

public void setDescription(String text)

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.

Parameters:

text - the description, or null to clear the description

See Also:

DESCRIPTION

setDisabledImageDescriptor

public void setDisabledImageDescriptor(ImageDescriptor newImage)

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.

Parameters:

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

See Also:

IMAGE

setEnabled

public void setEnabled(boolean enabled)

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.

Parameters:

enabled - true to enable, and false to disable

See Also:

ENABLED

setHelpListener

public void setHelpListener(HelpListener listener)

Sets a help listener for this action.

Parameters:

listener - a help listener for this action

setHoverImageDescriptor

public void setHoverImageDescriptor(ImageDescriptor newImage)

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.

Parameters:

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

See Also:

IMAGE

setId

public void setId(String id)

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.

Parameters:

id - the action id

See Also:

ActionContributionItem, IContributionItem.getId()

setImageDescriptor

public void setImageDescriptor(ImageDescriptor newImage)

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.

Parameters:

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

See Also:

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.

Parameters:

creator - the menu creator, or null if none

setText

public void setText(String text)

Sets the text for this action.

An accelerator specification may follow the actual text, separated from it by an '@' or a '\t' character. An accelerator specification consists of zero or more modifier tokens followed by a key code token. The tokens are separated by a '+' character.

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

Parameters:

text - the text, or null if none

See Also:

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

setToolTipText

public void setToolTipText(String text)

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.

Parameters:

text - the tool tip text, or null if none

See Also:

TOOL_TIP_TEXT

setAccelerator

public void setAccelerator(int keycode)

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.