/// <summary>
/// Gets a Boolean value indicating of the given command is allowed to execute.
/// </summary>
/// <param name="command">The command of interest.</param>
/// <returns><c>true</c> if the command should be allowed to execute, <c>false</c> otherwise.</returns>
protected override bool HandleCanExecuteChangedForCommand(VisualRelayCommand command)
{
var context = Context;
if (command.UniqueId == CancelRomsImportCommand.UniqueId)
{
context = ProgressIndicatorViewModel;
}
var canExecute = command.CanExecute(context);
if (command.UniqueId == RemoveRomsCommand.UniqueId)
{
if (canExecute)
{
NSResponder firstResponder = null;
if ((NSApplication.SharedApplication != null) && (NSApplication.SharedApplication.MainWindow != null))
{
firstResponder = NSApplication.SharedApplication.MainWindow.FirstResponder;
canExecute = firstResponder is NSTableView;
if (canExecute)
{
canExecute = (RomListView != null) && (RomListView.FindChild <NSTableView>() == firstResponder);
}
command.MenuItem.NativeMenuItem.KeyEquivalent = canExecute ? RemoveRomsCommand.KeyboardShortcutKey : string.Empty;
command.MenuItem.NativeMenuItem.KeyEquivalentModifierMask = (NSEventModifierMask)(canExecute ? RemoveRomsCommand.KeyboardShortcutModifiers : OSModifierKeys.None);
}
}
}
return(canExecute);
}
private OSVisual OSInitializeVisual()
{
var visual = new RomListView();
visual.DataContext = this; // not sure if this needs to be done...
return(visual);
}
/// <inheritdoc/>
public IEnumerable <ComponentVisual> GetVisuals()
{
// TODO: This is wrong... ViewModel should not create the visual - it should be the other way around
if (_visual == null)
{
var view = OSInitializeVisual().AsType <RomListView>();
_visual = new System.WeakReference(view);
}
RomListView romListView = _visual.IsAlive ? _visual.Target as RomListView : null; // ugh... .NET 4.0 doesn't have better Generic version of WeakReference<T> :(
var componentVisual = new ComponentVisual(RomListView.Id, romListView, Resources.Strings.RomListSettingsPage_Title);
yield return(componentVisual);
}
private OSVisual OSInitializeVisual()
{
var visual = new RomListView(this);
return(visual);
}
