ICommand.CanExecuteChanged Event
Definition
Important
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Occurs whenever something happens that affects whether the command can execute.
// Register
event_token CanExecuteChanged(EventHandler<IInspectable> const& handler) const;
// Revoke with event_token
void CanExecuteChanged(event_token const* cookie) const;
// Revoke with event_revoker
ICommand::CanExecuteChanged_revoker CanExecuteChanged(auto_revoke_t, EventHandler<IInspectable> const& handler) const;event System.EventHandler<object> CanExecuteChanged;function onCanExecuteChanged(eventArgs) { /* Your code */ }
iCommand.addEventListener("canexecutechanged", onCanExecuteChanged);
iCommand.removeEventListener("canexecutechanged", onCanExecuteChanged);
- or -
iCommand.oncanexecutechanged = onCanExecuteChanged;Event CanExecuteChanged As EventHandler(Of Object) Event Type
Remarks
Call CanExecute on the command element when this event occurs.
A command element typically disables itself if the command it is associated with cannot execute. For example, a MenuItem associated with the Paste command is disabled when the there is nothing on the clipboard to paste.