/// <summary>
/// Called after a child control is removed from this control. The default behavior is to call InvalidateAutoSize().
/// </summary>
protected virtual void OnChildRemoved(int index, Control child)
{
InvalidateAutoSize();
}
/// <summary>
/// Remove the given control from this control's list of children.
/// </summary>
public void RemoveChild(Control child)
{
if(child.Parent != this)
throw new InvalidOperationException();
RemoveChildAt(children.IndexOf(child));
}
public void AddChild(Control child)
{
if (child.Parent != null)
{
child.Parent.RemoveChild(child);
}
AddChild(child, ChildCount);
}
public void AddChild(Control child, int index)
{
if (child.Parent != null)
{
child.Parent.RemoveChild(child);
}
child.Parent = this;
if (children == null)
{
children = new List<Control>();
}
children.Insert(index, child);
OnChildAdded(index, child);
}
// Call this method once per frame on the root of your control heirarchy to draw all the controls.
// See ControlScreen for an example.
public static void BatchDraw(Control control, GraphicsDevice device, SpriteBatch spriteBatch, Vector2 offset, GameTime gameTime)
{
if (control != null && control.Visible)
{
spriteBatch.Begin();
control.Draw(new DrawContext
{
Device = device,
SpriteBatch = spriteBatch,
DrawOffset = offset + control.Position,
GameTime = gameTime
});
spriteBatch.End();
}
}
