/// <summary>
/// Creates a visual for a command.
/// </summary>
/// <param name="command">The command for which a visual must be created.</param>
/// <param name="requiresParentCommand">If <c>true</c>, this command requires a parent visual.</param>
/// <returns>The visual for the command.</returns>
public static Gtk.Widget CreateVisualForCommand(this VisualRelayCommand command, bool requiresParentCommand)
{
System.Diagnostics.Debug.Assert(!string.IsNullOrEmpty(command.UniqueId), "Command's UniqueId is not defined.");
Gtk.Widget visual = null;
var parentCommand = (VisualRelayCommand)command.VisualParent;
if (parentCommand != null)
{
var parentVisual = parentCommand.Visual.NativeVisual;
if (parentVisual is Gtk.MenuBar)
{
throw new System.InvalidOperationException("This should be done by CreateMenuItem!");
// Make a submenu for the command, and add the menu item to the menubar.
////var menu = new Gtk.Menu() { Name = command.UniqueId };
////var menuItem = new Gtk.MenuItem(command.MenuItemName) { Name = command.UniqueId, Submenu = menu };
////((Gtk.MenuBar)parentVisual).Add(menuItem);
////visual = menuItem;
}
if (parentVisual is Gtk.Toolbar)
{
// The default toolbar command visual will be a button. If a different visual is desired,
// the CommandGroup should override visual creation for that command in ICommandGroup.CreateVisualForCommand().
var toolbar = parentVisual as Gtk.Toolbar;
Gtk.ToolItem toolbarItem;
if (command.UniqueId == RootCommandGroup.ToolbarSeparatorCommand.UniqueId)
{
toolbarItem = new Gtk.SeparatorToolItem();
}
else
{
var group = command.GetCommandGroup() as CommandGroup;
toolbarItem = group.CreateToolbarItemForCommand(command).AsType <Gtk.ToolItem>();
}
var insertLocation = FindInsertLocation(parentCommand, command, false);
toolbar.Insert(toolbarItem, insertLocation); // if <0, appends
visual = toolbarItem;
}
if (parentCommand.Visual.IsEmpty)
{
var group = parentCommand.GetCommandGroup();
if (group != null)
{
parentCommand.Visual = group.CreateVisualForCommand(parentCommand);
}
}
ErrorReporting.ReportErrorIf(requiresParentCommand && parentCommand.Visual.IsEmpty, "Failed to create parent visual for command: " + command.Name + "(" + command.UniqueId + ")");
parentVisual = parentCommand.Visual;
}
DebugOutputIf(requiresParentCommand && (parentCommand == null), "No parent visual for command: " + command.Name + "(" + command.UniqueId + ")");
if (visual != null)
{
visual.SetValue(CommandGroup.AttachedCommandPropertyName, command);
var group = command.GetCommandGroup() as CommandGroup;
if (group != null)
{
var context = group.GetCommandContext(command, null);
visual.SetValue(IFakeDependencyObjectHelpers.DataContextPropertyName, context);
group.AttachCanExecuteChangeHandler(command);
}
}
return(visual);
}
