public VisualGraphics DrawVisual(GraphicsBase graphics)
{
VisualGraphics visual = VisualFactory.Create(graphics);
this.VisualList.Add(visual);
this.AddVisualChild(visual); // 该函数只会把DrawableVisual和DrawableVisualLayer关联起来，在渲染的时候并不会真正渲染。关联的目的是为了做命中测试（HitTest）。
visual.Render();
return(visual);
}
/// <summary>
/// 当前选中的Visual改变的时候被调用
/// 保证previouseSelected和selectedVisual都不为空
/// </summary>
/// <param name="previouseSelected"></param>
/// <param name="selectedVisual"></param>
private void ProcessSelectedVisualChanged(VisualGraphics previouseSelected, VisualGraphics selectedVisual)
{
if (previouseSelected == selectedVisual)
{
return;
}
if (previouseSelected != null)
{
if (previouseSelected != selectedVisual)
{
previouseSelected.IsSelected = false;
previouseSelected.Render();
selectedVisual.IsSelected = true;
selectedVisual.Render();
}
}
else
{
selectedVisual.IsSelected = true;
selectedVisual.Render();
}
}
/// <summary>
/// 保存图形里输入的文本
/// </summary>
private void StopVisualInputState(VisualGraphics visual)
{
if (this.visualState != Visuals.VisualState.InputState)
{
return;
}
if (visual == null)
{
return;
}
visual.Graphics.TextProperties.Text = this.TextBoxEditor.Text;
visual.Render(); // 刷新文本信息
this.TextBoxEditor.Text = null;
this.TextBoxEditor.Visibility = Visibility.Collapsed;
}
