我是 wpf 的初学者,今天我遇到了一个奇怪的问题,如果我将动画添加到网格列,gridsplitter 就会停止工作,下面是代码片段,这是一个毫无意义但非常简单的测试代码,它什么也不做,除非当鼠标进入右栏,宽度会从15扩大到100
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Name="c1"/>
<ColumnDefinition Name="c2" Width="15" MinWidth="15"/>
</Grid.ColumnDefinitions>
<Border Grid.Column="0" Background="Gray"></Border>
<GridSplitter Width="8" Background="Yellow"></GridSplitter>
<Border Grid.Column="1" Background="Silver" Name="bdRight" MouseEnter="bdRight_MouseEnter"></Border>
</Grid>
还有这个:
bool flag = true;
private void bdRight_MouseEnter(object sender, MouseEventArgs e)
{
if (flag)
{
flag = false;
var da = new GridLengthAnimation();
da.From = new GridLength(c2.MinWidth);
da.To = new GridLength(100);
var ef = new BounceEase();
ef.EasingMode = EasingMode.EaseOut;
da.EasingFunction = ef;
this.c2.BeginAnimation(ColumnDefinition.WidthProperty, da);
}
}
这是GridLengthAnimation,我发现DoubleAnimation不能用于网格列的宽度后,我从互联网上得到它。
public class GridLengthAnimation : AnimationTimeline
{
public static readonly DependencyProperty FromProperty;
public static readonly DependencyProperty ToProperty;
public static readonly DependencyProperty EasingFunctionProperty;
static GridLengthAnimation()
{
FromProperty = DependencyProperty.Register("From", typeof(GridLength), typeof(GridLengthAnimation));
ToProperty = DependencyProperty.Register("To", typeof(GridLength), typeof(GridLengthAnimation));
EasingFunctionProperty = DependencyProperty.Register("EasingFunction", typeof(IEasingFunction), typeof(GridLengthAnimation));
}
protected override Freezable CreateInstanceCore()
{
return new GridLengthAnimation();
}
public override Type TargetPropertyType
{
get { return typeof(GridLength); }
}
public IEasingFunction EasingFunction
{
get
{
return (IEasingFunction)GetValue(GridLengthAnimation.EasingFunctionProperty);
}
set
{
SetValue(GridLengthAnimation.EasingFunctionProperty, value);
}
}
public GridLength From
{
get
{
return (GridLength)GetValue(GridLengthAnimation.FromProperty);
}
set
{
SetValue(GridLengthAnimation.FromProperty, value);
}
}
public GridLength To
{
get
{
return (GridLength)GetValue(GridLengthAnimation.ToProperty);
}
set
{
SetValue(GridLengthAnimation.ToProperty, value);
}
}
public override object GetCurrentValue(object defaultOriginValue, object defaultDestinationValue, AnimationClock animationClock)
{
double fromValue = ((GridLength)GetValue(GridLengthAnimation.FromProperty)).Value;
double toValue = ((GridLength)GetValue(GridLengthAnimation.ToProperty)).Value;
IEasingFunction easingFunction = this.EasingFunction;
double progress = (easingFunction != null) ? easingFunction.Ease(animationClock.CurrentProgress.Value) : animationClock.CurrentProgress.Value;
if (fromValue > toValue)
{
return new GridLength((1 - progress) * (fromValue - toValue) + toValue, this.To.IsStar ? GridUnitType.Star : GridUnitType.Pixel);
}
else
{
return new GridLength((progress) * (toValue - fromValue) + fromValue, this.To.IsStar ? GridUnitType.Star : GridUnitType.Pixel);
}
}
}
如果我在 MouseEnter 事件处理程序中注释掉代码,则拆分器可以正常工作,否则它将停止工作。有任何想法吗?