c# - 向“切换”发送垃圾邮件时,C#/WPF 处理活动的故事板动画
问题描述
基本上我有这个动画,当您单击按钮时,它会切换网格,显示或隐藏第二列(包含 Button2)...我的问题是,当您点击按钮时,动画会排队所以它需要在做第二个动画之前完成第一个动画。我唯一的解决方法是在动画处于活动状态时禁用按钮,然后在动画完成后重新启用它们。但我正在尝试找到一种方法以某种方式中断活动动画,而是使用网格的当前宽度来启动第二个动画。
private void Window_Loaded(object sender, RoutedEventArgs e)
{
_toggle = false;
GridBodyWidthOne = new GridLength(1, GridUnitType.Star);
GridBodyWidthZero = new GridLength(0, GridUnitType.Star);
GridBody0Width = GridBodyWidthOne;
GridBody1Width = GridBodyWidthZero;
storyboard = this.FindResource("expandBody0") as Storyboard;
storyboard.FillBehavior = FillBehavior.Stop;
storyboard.Completed += (object o, EventArgs ea) => {
GridBody0.Width = GridBodyWidthOne;
GridBody1.Width = GridBodyWidthZero;
GridBody0.BeginAnimation(ColumnDefinition.WidthProperty, null);
GridBody1.BeginAnimation(ColumnDefinition.WidthProperty, null);
GridSplitter0.IsEnabled = false;};
storyboard = this.FindResource("retractBody0") as Storyboard;
storyboard.FillBehavior = FillBehavior.Stop;
storyboard.Completed += (object o, EventArgs ea) => {
GridBody0.Width = GridBodyWidthOne;
GridBody1.Width = GridBodyWidthOne;
GridBody0.BeginAnimation(ColumnDefinition.WidthProperty, null);
GridBody1.BeginAnimation(ColumnDefinition.WidthProperty, null);
GridSplitter0.IsEnabled = true;};
}
private void Button_Click(object sender, RoutedEventArgs e)
{
ToggleMainBody1();
}
private void ToggleMainBody1()
{
double maxWidth = GridBody0.ActualWidth + GridBody1.ActualWidth;
double width0 = GridBody0.ActualWidth / maxWidth;
double width1 = GridBody1.ActualWidth / maxWidth;
GridBody0Width = new GridLength(width0, GridUnitType.Star);
GridBody1Width = new GridLength(width1, GridUnitType.Star);
if (!_toggle)
RevealMainBody1();
else
HideMainBody1();
_toggle = !_toggle;
}
private void HideMainBody1()
{
//storyboard = this.FindResource("retractBody0") as Storyboard;
//storyboard.Stop(this);
storyboard = this.FindResource("expandBody0") as Storyboard;
storyboard.Begin(this);
}
private void RevealMainBody1()
{
//storyboard = this.FindResource("expandBody0") as Storyboard;
//storyboard.Stop(this);
storyboard = this.FindResource("retractBody0") as Storyboard;
storyboard.Begin(this);
}
至于为什么我将 FillBehavior 设置为“Stop”,如果将 GridSplitter 设置为“HoldEnd”,我会遇到问题。“HoldEnd”实际上效果很好,但当我通过 GridSplitter 调整它时就不行了。所以基本上,当您双击切换按钮(或触发切换两次而没有完成第一个动画)时,就会出现问题。
<Window x:Class="ColumnAdjustmentV2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:ColumnAdjustmentV2"
xmlns:g="clr-namespace:ColumnAdjustmentV2"
mc:Ignorable="d"
Title="MainWindow" Height="650" Width="800" Loaded="Window_Loaded" SizeChanged="Window_SizeChanged" StateChanged="Window_StateChanged" >
<Window.Resources>
<Storyboard x:Key="expandBody0">
<!--<g:GridLengthAnimation BeginTime="0:0:0" Duration="0:0:0.5" Storyboard.TargetName="GridBody0" Storyboard.TargetProperty="Width" From="{Binding Path=GridBody0Width}" To="{Binding Path=GridBodyWidthOne}" />-->
<g:GridLengthAnimation BeginTime="0:0:0" Duration="0:0:0.5" Storyboard.TargetName="GridBody1" Storyboard.TargetProperty="Width" From="{Binding Path=GridBody1Width}" To="{Binding Path=GridBodyWidthZero}" />
</Storyboard>
<Storyboard x:Key="retractBody0">
<!--<g:GridLengthAnimation BeginTime="0:0:0" Duration="0:0:0.5" Storyboard.TargetName="GridBody0" Storyboard.TargetProperty="Width" From="{Binding Path=GridBody0Width}" To="{Binding Path=GridBodyWidthOne}" />-->
<g:GridLengthAnimation BeginTime="0:0:0" Duration="0:0:0.5" Storyboard.TargetName="GridBody1" Storyboard.TargetProperty="Width" From="{Binding Path=GridBody1Width}" To="{Binding Path=GridBodyWidthOne}" />
</Storyboard>
</Window.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="500" />
<RowDefinition Height="100" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition x:Name="GridBody0" Width="{Binding Path=GridBody0Width, Mode=TwoWay}" />
<ColumnDefinition x:Name="GridBodyDivider" Width="Auto" />
<ColumnDefinition x:Name="GridBody1" Width="{Binding Path=GridBody1Width, Mode=TwoWay}" />
</Grid.ColumnDefinitions>
<Button x:Name="Button1" Grid.Column="0" Content="Button1" Click="Button_Click" />
<GridSplitter x:Name="GridSplitter0" Grid.Column="1" Background="#FFCC0099" HorizontalAlignment="Center" Margin="0" Width="4" VerticalAlignment="Stretch" LayoutUpdated="GridSplitter_LayoutUpdated" MouseDoubleClick="GridSplitter_MouseDoubleClick" PreviewKeyDown="GridSplitter_PreviewKeyDown" PreviewMouseUp="GridSplitter_PreviewMouseUp" />
<Button x:Name="Button2" Grid.Column="2" Content="Button2" Click="Button_Click" />
</Grid>
<Grid Grid.Row="1">
<Button x:Name="Button3" Content=""/>
</Grid>
</Grid>
解决方案
我准备了一个我认为可能对您有帮助的示例项目:https ://github.com/Drreamer/AnimationReverse 在此示例中,我使用动画将按钮的大小从最小宽度调整为最大宽度。要启动动画或反向运行动画,只需单击按钮。
<Grid x:Name="rootGrid">
<Button x:Name="button" MinWidth="40" Width="40" Content="Expand"
local:MainWindow.AnimationDuration="0:0:2" HorizontalAlignment="Left" Click="button_Click" >
<Button.Triggers>
<EventTrigger RoutedEvent="Button.Click">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="button"
Storyboard.TargetProperty="Width"
From="{Binding ActualWidth, ElementName=button}"
Duration="{Binding Path=(local:MainWindow.AnimationDuration), ElementName=button}">
<DoubleAnimation.To>
<MultiBinding Converter="{StaticResource ToWidthConverter}">
<Binding ElementName="button" Path="Tag" />
<Binding ElementName="button" Path="MinWidth" />
<Binding ElementName="rootGrid" Path="ActualWidth" />
</MultiBinding>
</DoubleAnimation.To>
</DoubleAnimation>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Button.Triggers>
</Button>
</Grid>
这里我使用绑定来动态设置 To 和 Duration 属性。我将有关当前动画方向的信息存储在 Tag 属性中。Duration 是根据当前元素宽度从 Button.Click 事件动态计算的。这里的目标是确保动画始终以相同的速度应用。
private void button_Click(object sender, RoutedEventArgs e) {
double currentPosition = (button.ActualWidth - button.MinWidth) / (rootGrid.ActualWidth - button.MinWidth);
if (button.Tag is bool && (bool)button.Tag)
button.Tag = false;
else {
currentPosition = 1 - currentPosition;
button.Tag = true;
}
SetAnimationDuration(button, new Duration(TimeSpan.FromSeconds(5 * currentPosition)));
}
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