/// <summary>
/// Determine if an action should be enabled.
/// </summary>
/// <param name="actionName">The action name.</param>
/// <returns>True if the action should be enabled. False if not or
/// the action doesn't exist.</returns>
public bool IsActionEnabled(string actionName)
{
/*
* Return false if the action doesn't exist.
* Cannot enable an action it can't do.
*/
if (!_actionStateHandlers.ContainsKey(actionName))
{
return(false);
}
ActionStateHandler d = _actionStateHandlers[actionName];
if (d != null)
{
return(d());
}
else
{
return(false);
}
}
/*
* ActionState Handlers
*
* ActionState handlers allow a document to register callback
* methods with the MainForm. Each callback responds to a
* particular action available from a MainForm UI element
* (menu and toolbar). When a document becomes active the
* mainform calls each method registered for that document to
* determine the state of each available UI element.
*
* If the callback returns false or no callback has been
* registered the corresponding UI element will be disabled.
*/
/// <summary>
/// Register an ActionState handler for the document. ActionState
/// handlers allow a document to register callback methods with document
/// management system. Each callback responds to a particular action
/// available from a MainForm UI element (menu and toolbar). When a
/// document becomes active the document manager calls each method
/// registered for that document to determine the state of each available
/// UI element. If the callback returns false or no callback has been
/// registered the corresponding UI element will be disabled.
/// </summary>
/// <param name="action">The name of the action.</param>
/// <param name="handler">The ActionState event handler.</param>
public void RegisterActionStateHandler(
string action, ActionStateHandler handler)
{
_actionStateHandlers[action] = handler;
}
