public MainPage()
{
this.InitializeComponent();
// Instantiate lists and stacks to keep track of the state
_shapeList = new List <PaintBase>();
_undoStack = new Stack <List <PaintBase> >();
_redoStack = new Stack <List <PaintBase> >();
// Initialize invokers for the command pattern
_canvasInvoker = new ClickInvoker();
_userInvoker = new UserActionInvoker();
// Set initial selection to circle
CircleToggle.IsChecked = true;
_cmd = new DrawShapeCommand(this)
{
ShapeType = CircleShape.Instance
};
// Set canvas Z indici
Canvas.SetZIndex(BottomPanel, 100);
Canvas.SetZIndex(TopBar, 100);
Canvas.SetZIndex(ShapeList, 100);
}
/// <summary>
/// Handles UI toggles
/// </summary>
private void BrushToggle_OnClick(object sender, RoutedEventArgs e)
{
if (sender is AppBarToggleButton button)
{
// Make sure all toggles are off before turning a new one on
ClickSelectToggle.IsChecked = false;
SelectToggle.IsChecked = false;
MoveToggle.IsChecked = false;
ScaleToggle.IsChecked = false;
CircleToggle.IsChecked = false;
RectangleToggle.IsChecked = false;
EditDecorator.IsChecked = false;
// Check what button is toggled and change the active command accordingly
switch (button.Name)
{
case "ClickSelectToggle":
ClickSelectToggle.IsChecked = true;
_cmd = new ClickSelectCommand(this);
break;
case "SelectToggle":
SelectToggle.IsChecked = true;
_cmd = new SelectCommand(this);
break;
case "EditDecorator":
EditDecorator.IsChecked = true;
_cmd = new ChangeDecoratorCommand(this);
break;
case "MoveToggle":
MoveToggle.IsChecked = true;
_cmd = new MoveCommand(this);
break;
case "ScaleToggle":
ScaleToggle.IsChecked = true;
_cmd = new ScaleCommand(this);
break;
case "RectangleToggle":
RectangleToggle.IsChecked = true;
_cmd = new DrawShapeCommand(this)
{
ShapeType = RectangleShape.Instance
};
break;
case "CircleToggle":
CircleToggle.IsChecked = true;
_cmd = new DrawShapeCommand(this)
{
ShapeType = CircleShape.Instance
};
break;
}
}
}
public void StoreAndExecute(ICanvasCommand command)
{
try{
command.Execute();
OnExecuteSuccess();
}
catch (Exception e)
{
OnExcuteException(e);
}
}
/// <summary>
/// Invokes the command for pointer move
/// </summary>
/// <param name="cmd">Command</param>
public async Task InvokePointerMovedAsync(ICanvasCommand cmd)
{
await cmd.PointerMovedExecuteAsync();
}
