MeasureOverride和ArrangeOverride 练手项目
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public class Diagnol:Panel { /// <summary> /// 测量 /// </summary> /// <param name="availableSize">This的尺寸</param> /// <returns></returns> protected override Size MeasureOverride(Size availableSize) { Size size = new Size(); foreach (UIElement item in this.InternalChildren) { item.Measure(availableSize); size.Width += item.DesiredSize.Width; size.Height += item.DesiredSize.Height; } //返回所有子控件需要的 总尺寸 return base.MeasureOverride(size); } /// <summary> /// 排列每个子控件 /// </summary> /// <param name="finalSize">This的尺寸</param> /// <returns></returns> protected override Size ArrangeOverride(Size finalSize) { Point point1 = new Point(); //子控件个数 int count = this.InternalChildren.Count; //总个数的中间值 int index = (count + 1) / 2-1; for (int i = 0; i < this.InternalChildren.Count; i++) { var child = this.InternalChildren[i]; //如果就一个没法玩,直接排列 if (count <= 1) { //设置子控件的位置 child.Arrange(new Rect(point1, child.DesiredSize)); break; } //玩起来 if (i < index) { child.Arrange(new Rect(point1, child.DesiredSize)); point1.X += child.DesiredSize.Width; point1.Y += child.DesiredSize.Height; } else { child.Arrange(new Rect(point1, child.DesiredSize)); point1.X += child.DesiredSize.Width; point1.Y -= child.DesiredSize.Height; } } return base.ArrangeOverride(finalSize); } }
<local:Diagnol> <Button BorderBrush="Black" Background="Red" Content="0" Width="40"></Button> <Button BorderBrush="Black" Background="Red" Content="1" Width="40"></Button> <Button BorderBrush="Black" Background="Red" Content="2" Width="40"></Button> <Button BorderBrush="Black" Background="Red" Content="3" Width="40"></Button> <Button BorderBrush="Black" Background="Red" Content="4" Width="40"></Button> <Button BorderBrush="Black" Background="Red" Content="5" Width="40"></Button> <Button BorderBrush="Black" Background="Red" Content="6" Width="40"></Button> <Button BorderBrush="Black" Background="Red" Content="7" Width="40"></Button> <Button BorderBrush="Black" Background="Red" Content="8" Width="40"></Button> </local:Diagnol>
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