WPF 如何在基础控件上显示 Loading 等待动画
- 框架使用
.NET4 至 .NET6； Visual Studio 2022;- 使用方式需引入命名空间后设置控件的附加属性
wd:Loading.IsShow="true"，即可显示默认等待动画效果如下：
- 如需自定义
Loading一定要 先设置wd:Loading.Child在设置IsShow="true"。 - 显示不同
Loading内容需wd:Loading.Child ={x:Static wd:NormalLoading.Default}进行复赋值显示NormalLoading效果如下：
实现代码
1）创建 BasicControlsExample.xaml 代码如下:
<UserControl x:Class="WPFDevelopers.Samples.ExampleViews.BasicControlsExample"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:WPFDevelopers.Samples.ExampleViews"
xmlns:wpfdev="https://github.com/WPFDevelopersOrg/WPFDevelopers"
xmlns:controls="clr-namespace:WPFDevelopers.Samples.Controls"
mc:Ignorable="d" Background="{DynamicResource BackgroundSolidColorBrush}"
d:DesignHeight="450" d:DesignWidth="800" Name="MyBasicControls">
<TextBlock Text="Loading" FontSize="20" Margin="0,20,0,0"/>
<WrapPanel Margin="0,10">
<Button Content="Loading" Click="Loading_Click"
Style="{DynamicResource PrimaryButton}"/>
<Button Name="btnLoadingTask" Content="LoadingTask" Click="LoadingTask_Click"
Style="{DynamicResource SuccessPrimaryButton}" Margin="10,0"/>
<Button Name="btnLoading" Click="BtnLoading_Click" Content="AddLoading"
wpfdev:Loading.Child="{x:Static wpfdev:NormalLoading.Default}"
Style="{DynamicResource WarningPrimaryButton}"/>
<Button Name="btnOffTask" Click="BtnOffTask_Click"
Margin="10,0" Content="Off Task"
Style="{DynamicResource DangerPrimaryButton}"/>
</WrapPanel>
</UserControl>
2）逻辑 BasicControlsExample.xaml.cs 代码如下:
对控件进行等待动画。
private void Loading_Click(object sender, RoutedEventArgs e)
{
var task = new Task(() => { Thread.Sleep(5000); });
task.ContinueWith(previousTask =>
{
Loading.SetIsShow(MyBasicControls, false);
},
TaskScheduler.FromCurrentSynchronizationContext());
Loading.SetIsShow(MyBasicControls, true);
task.Start();
}
基础控件上添加等待动画。
private void BtnLoading_Click(object sender, RoutedEventArgs e)
{
var task = new Task(() => { Thread.Sleep(5000); });
task.ContinueWith(previousTask => { Loading.SetIsShow(btnLoading, false); }, TaskScheduler.FromCurrentSynchronizationContext());
Loading.SetIsShow(btnLoading, true);
task.Start();
}
关闭基础控件的等待动画。
private void BtnOffTask_Click(object sender, RoutedEventArgs e)
{
if (tokenSource == null) return;
tokenSource.Cancel();
Loading.SetIsShow(btnLoadingTask, false);
}
private CancellationTokenSource tokenSource;
private void LoadingTask_Click(object sender, RoutedEventArgs e)
{
tokenSource = new CancellationTokenSource();
var cancellationToken = tokenSource.Token;
var task = new Task(() =>
{
for (int i = 0; i < 10; i++)
{
//这里做自己的事情
if (tokenSource.IsCancellationRequested)
return;
Thread.Sleep(1000);
}
}, cancellationToken);
task.ContinueWith(previousTask =>
{
if (tokenSource.IsCancellationRequested)
return;
Loading.SetIsShow(btnLoadingTask, false);
}, TaskScheduler.FromCurrentSynchronizationContext());
Loading.SetIsShow(btnLoadingTask, true);
task.Start();
}
效果图
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