我希望我可以通过拖动该边框的四条边来动态控制边框和边框内元素大小该怎么做
时间: 2024-03-05 20:54:43 浏览: 24
要实现拖动边框调整大小的功能,可以在 CustomFont 控件中添加四个 Thumb 控件,分别代表边框的四个角落。然后在 Thumb 的 DragDelta 事件中动态调整控件的大小。
以下是示例代码:
```csharp
public class CustomFont : Control
{
// ...
private Thumb topLeftThumb;
private Thumb topRightThumb;
private Thumb bottomLeftThumb;
private Thumb bottomRightThumb;
public CustomFont()
{
// ...
// 添加四个 Thumb 控件
AddThumb(ref topLeftThumb, Cursors.SizeNWSE);
AddThumb(ref topRightThumb, Cursors.SizeNESW);
AddThumb(ref bottomLeftThumb, Cursors.SizeNESW);
AddThumb(ref bottomRightThumb, Cursors.SizeNWSE);
}
// 添加 Thumb 控件
private void AddThumb(ref Thumb thumb, Cursor cursor)
{
thumb = new Thumb();
thumb.Cursor = cursor;
thumb.Width = thumb.Height = 10;
thumb.Background = new SolidColorBrush(Colors.White);
thumb.BorderBrush = new SolidColorBrush(Colors.Black);
thumb.BorderThickness = new Thickness(1);
thumb.DragDelta += Thumb_DragDelta;
visualBrush.Visual = thumb;
visualBrush.Viewbox = new Rect(0, 0, 10, 10);
visualBrush.Viewport = new Rect(0, 0, 10, 10);
visualBrush.Stretch = Stretch.None;
Canvas.SetLeft(thumb, -5);
Canvas.SetTop(thumb, -5);
thumbCanvas.Children.Add(thumb);
}
// Thumb 的 DragDelta 事件处理程序
private void Thumb_DragDelta(object sender, DragDeltaEventArgs e)
{
double newWidth = ActualWidth;
double newHeight = ActualHeight;
if (sender == topLeftThumb || sender == topRightThumb)
{
newHeight = Math.Max(MinHeight, ActualHeight - e.VerticalChange);
}
if (sender == topRightThumb || sender == bottomRightThumb)
{
newWidth = Math.Max(MinWidth, ActualWidth + e.HorizontalChange);
}
if (sender == bottomLeftThumb || sender == bottomRightThumb)
{
newHeight = Math.Max(MinHeight, ActualHeight + e.VerticalChange);
}
if (sender == topLeftThumb || sender == bottomLeftThumb)
{
newWidth = Math.Max(MinWidth, ActualWidth - e.HorizontalChange);
}
Width = newWidth;
Height = newHeight;
}
}
```
这样就可以通过拖动四个 Thumb 控件来调整控件的大小了。同时,由于 Thumb 控件位于 CustomFont 控件上层的 Canvas 中,所以它们不会影响 CustomFont 控件本身的布局。
相关推荐
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![-](https://csdnimg.cn/download_wenku/file_type_column_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)