org.gnu.gtk

Class Action

Known Direct Subclasses:
ToggleAction

public class Action
extends GObject

An action which can be triggered by a menu or toolbar item.

Actions represent operations that the user can be perform, along with some information how it should be presented in the interface. Each action provides methods to create icons, menu items and toolbar items representing itself.

As well as the callback that is called when the action gets activated, the following also gets associated with the action:

a name (not translated, for path lookup)

a label (translated, for display)

an accelerator

whether label indicates a stock id

a tooltip (optional, translated)

a toolbar label (optional, shorter than label)

The action will also have some state information:

visible (shown/hidden)

sensitive (enabled/disabled)

Apart from regular actions, there are ToggleAction, which can be toggled between two states and RadioAction, of which only one in a group can be in the "active" state. Other actions can be implemented as Action subclasses.

Each action can have one or more proxy menu item, toolbar button or other proxy widgets. Proxies mirror the state of the action (text label, tooltip, icon, visible, sensitive, etc), and should change when the action's state changes. When the proxy is activated, it should activate its action.

Constructor Summary

Action(String name, String label, String tooltip, String stockId)
Construct a new Action object.

Method Summary

void
activate()
Emits the "activate" signal on the specified action, if it isn't insensitive.
void
addListener(ActionListener listener)
Register an object to receive action activation event notification.
void
connectAccelerator()
Installs the accelerator for action if action has an accel path and group.
void
connectProxy(Widget proxy)
Connects a widget to an action object as a proxy.
Widget
createIcon(IconSize iconSize)
This function is intended for use by action implementations to create icons displayed in the proxy widgets.
Widget
createMenuItem()
Creates a menu item widget that proxies for the given action.
Widget
createToolItem()
Creates a toolbar item widget that proxies for the given action.
void
disconnectAccelerator()
Undoes the effect of one call to connectAccelerator().
void
disconnectProxy(Widget proxy)
Disconnects a proxy widget from an action.
String
getAcceleratorPath()
String
getName()
Returns the name of the action.
List
getProxies()
Returns the proxy widgets for an action.
static org.gnu.glib.Type
getType()
Retrieve the runtime type used by the GLib library.
boolean
isSensitive()
boolean
isVisible()
void
removeListener(ActionListener listener)
Unregister an object that was receiving focus event notification.
void
setAccelGroup(AccelGroup group)
Sets the AccelGroup in which the accelerator for this action will be installed.
void
setAccelPath(String path)
Sets the accel path for this action.
void
setSensitive(boolean sensitive)
void
setVisible(boolean visible)

Constructor Details

Action

public Action(String name,
              String label,
              String tooltip,
              String stockId)
Construct a new Action object.

Method Details

activate

public void activate()
Emits the "activate" signal on the specified action, if it isn't insensitive. This gets called by the proxy widgets when they get activated. It can also be used to manually activate an action.

addListener

public void addListener(ActionListener listener)
Register an object to receive action activation event notification.
Parameters:
listener - The object that has implemented the ActionListener interface that is to receive the activation events.
Since:
2.8

connectAccelerator

public void connectAccelerator()

connectProxy

public void connectProxy(Widget proxy)
Connects a widget to an action object as a proxy. Synchronises various properties of the action with the widget (such as label text, icon, tooltip, etc), and attaches a callback so that the action gets activated when the proxy widget does. If the widget is already connected to an action, it is disconnected first.
Parameters:
proxy - the proxy widget

createIcon

public Widget createIcon(IconSize iconSize)
This function is intended for use by action implementations to create icons displayed in the proxy widgets.
Parameters:
iconSize - the size of the icon that should be created
Returns:
a widget that displays the icon for this action

createMenuItem

public Widget createMenuItem()
Creates a menu item widget that proxies for the given action.
Returns:
a menu item connected to the action

createToolItem

public Widget createToolItem()
Creates a toolbar item widget that proxies for the given action.
Returns:
a toolbar item connected to the action

disconnectAccelerator

public void disconnectAccelerator()

disconnectProxy

public void disconnectProxy(Widget proxy)
Disconnects a proxy widget from an action. Does not destroy the widget, however.
Parameters:
proxy - the proxy widget

getAcceleratorPath

public String getAcceleratorPath()

getName

public String getName()
Returns the name of the action.
Returns:
the name of the action

getProxies

public List getProxies()
Returns the proxy widgets for an action.
Returns:
a List of proxy widgets

getType

public static org.gnu.glib.Type getType()
Retrieve the runtime type used by the GLib library.

isSensitive

public boolean isSensitive()

isVisible

public boolean isVisible()

removeListener

public void removeListener(ActionListener listener)
Unregister an object that was receiving focus event notification.
Parameters:
listener - The object that is to no longer receive focus events.
Since:
2.8

setAccelGroup

public void setAccelGroup(AccelGroup group)
Sets the AccelGroup in which the accelerator for this action will be installed.
Parameters:
group - an AccelGroup or null
Since:
2.8

setAccelPath

public void setAccelPath(String path)
Sets the accel path for this action. All proxy widgets associated with the action will have this accel path, so that their accelerators are consistent.
Parameters:
path - The accelerator path
Since:
2.8

setSensitive

public void setSensitive(boolean sensitive)

setVisible

public void setVisible(boolean visible)