public override OSVisual CreateVisualForCommand(ICommand command)
{
OSVisual visual = OSVisual.Empty;
var visualCommand = command as VisualRelayCommand;
var window = INTV.Shared.Utility.SingleInstanceApplication.Instance.MainWindow;
if (visualCommand != null)
{
switch (visualCommand.UniqueId)
{
case UniqueNameBase + ".Root":
visual = window.FindChild <Gtk.Toolbar>(c => c.Name == "_toolbar");
break;
case UniqueNameBase + ".RootMenu":
case UniqueNameBase + ".ApplicationMenuCommand":
visual = window.FindChild <Gtk.MenuBar>(c => c.Name == "_menubar");
break;
default:
visual = base.CreateVisualForCommand(command);
break;
}
}
return(visual);
}
/// <summary>
/// Initializes a new instance of ProgressIndicatorViewModel, attaching it to the specified visual.
/// </summary>
/// <param name="visual">The visual with which to associate the progress indicator.</param>
/// <remarks>This is an atypical construction pattern, driven partly by pragmatism and partly
/// by laziness in getting the different platforms involved. Blame the Mac and me not caring
/// to revisit every off-the-cuff workaround I created while trying to avoid replicating the
/// notion of DependencyObject / DependencyPropery and the whole inheritance mechanism.</remarks>
public ProgressIndicatorViewModel(OSVisual visual)
{
DisplayDelay = DefaultDisplayDelay;
if (!visual.IsEmpty)
{
visual.NativeVisual.SetValue(ProgressIndicatorViewModelDataContextProperty, this);
}
}
/// <summary>
/// Gets a Boolean value indicating of the given command is allowed to execute.
/// </summary>
/// <param name="command">The command of interest.</param>
/// <param name="visual">The visual with which the command is associated</param>
/// <returns><c>true</c> if the command should be allowed to execute, <c>false</c> otherwise.</returns>
protected override bool HandleCanExecuteChangedForCommand(VisualRelayCommand command, OSVisual visual)
{
var canExecute = true;
if ((command.UniqueId == RomListCommandGroup.RemoveRomsCommand.UniqueId) && (visual.NativeVisual is Gtk.MenuItem))
{
// for this one, disable the menu item unless the RomListView's tree has focus.
canExecute = RomListViewModel.ListHasFocus;
}
return(canExecute && base.HandleCanExecuteChangedForCommand(command, visual));
}
private void OSInitializeVisual(OSVisual visual)
{
}
/// <summary>
/// Gets a Boolean value indicating of the given command is allowed to execute.
/// </summary>
/// <param name="command">The command of interest.</param>
/// <param name="visual">The visual with which the command is associated</param>
/// <returns><c>true</c> if the command should be allowed to execute, <c>false</c> otherwise.</returns>
protected virtual bool HandleCanExecuteChangedForCommand(VisualRelayCommand command, OSVisual visual)
{
object dataContext = null;
if (!visual.IsEmpty)
{
dataContext = visual.NativeVisual.GetInheritedValue(IFakeDependencyObjectHelpers.DataContextPropertyName);
}
if (dataContext == null)
{
dataContext = GetContextForCommand(dataContext, command, Context);
}
return(command.CanExecute(dataContext));
}
