54 lines
2.1 KiB
C#
54 lines
2.1 KiB
C#
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using Sinvo.EplanHpD.Plugin.WPFUI.Utils;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Controls;
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using System.Windows.Input;
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using System.Windows.Media.Animation;
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namespace Sinvo.EplanHpD.Plugin.WPFUI.Controls
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{
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//继承ScrollViewer 通过截获MouseWheel事件控制滚动
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public class MyScrollViewer : ScrollViewer
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{
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//记录上一次的滚动位置
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private double LastLocation = 0;
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//重写鼠标滚动事件
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protected override void OnMouseWheel(MouseWheelEventArgs e)
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{
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double WheelChange = e.Delta;
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//可以更改一次滚动的距离倍数 (WheelChange可能为正负数!)
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double newOffset = LastLocation - (WheelChange * 2);
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//Animation并不会改变真正的VerticalOffset(只是它的依赖属性) 所以将VOffset设置到上一次的滚动位置 (相当于衔接上一个动画)
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ScrollToVerticalOffset(LastLocation);
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//碰到底部和顶部时的处理
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if (newOffset < 0)
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newOffset = 0;
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if (newOffset > ScrollableHeight)
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newOffset = ScrollableHeight;
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AnimateScroll(newOffset);
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LastLocation = newOffset;
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//告诉ScrollViewer我们已经完成了滚动
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e.Handled = true;
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}
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private void AnimateScroll(double ToValue)
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{
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//为了避免重复，先结束掉上一个动画
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BeginAnimation(ScrollViewerBehavior.VerticalOffsetProperty, null);
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DoubleAnimation Animation = new DoubleAnimation();
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Animation.EasingFunction = new CubicEase() { EasingMode = EasingMode.EaseOut };
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Animation.From = VerticalOffset;
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Animation.To = ToValue;
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//动画速度
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Animation.Duration = TimeSpan.FromMilliseconds(800);
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//考虑到性能，可以降低动画帧数
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//Timeline.SetDesiredFrameRate(Animation, 40);
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BeginAnimation(ScrollViewerBehavior.VerticalOffsetProperty, Animation);
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}
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}
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}
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