WPF开发随笔收录-仿安卓Toast

一、前言

在项目中，经常需要用到消息提醒功能，在以前接触安卓开发那会使用过Toast，于是打算在WPF上也来模仿一个，话不多说，撸起袖子干起来！

二、正文

1、首先新建一个工程，工程的目录如下

2、编写Toast.cs的代码，这里因为只需要显示文本信息，所以Toast继承Label即可，然后添加一个定时关闭的方法

public class Toast : Label
{
    public Toast()
    {
            
    }

    public void SetTimeClose(TimeSpan time)
    {
        new Thread(() =>
        {
            Thread.Sleep(time);
            if (this.Parent is Panel)
            {
                this.Dispatcher.BeginInvoke(new Action(() =>
                {
                    (this.Parent as Panel).Children.Remove(this);
                }));
            }
        })
        { IsBackground = true }.Start();
    }
}

3、接着编写一下Toast控件的样式

<Style TargetType="{x:Type ctls:Toast}">
    <Setter Property="Foreground" Value="White" />
    <Setter Property="FocusVisualStyle" Value="{x:Null}" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ctls:Toast}">
                <Border
                    MinWidth="50"
                    MinHeight="50"
                    Padding="25,0"
                    Background="#90000000"
                    CornerRadius="2">
                    <Border.Effect>
                        <DropShadowEffect BlurRadius="10" ShadowDepth="1" />
                    </Border.Effect>
                    <ContentPresenter
                        HorizontalAlignment="Center"
                        VerticalAlignment="Center"
                        TextBlock.FontSize="14" />
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

4、编辑MainWindow.xaml文件，其中StackPanel是用来添加Toast控件的容器

<Window x:Class="ToastDemo.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:ToastDemo"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid>
            <Button 
                Width="100"
                Height="50"
                Content="Button"
                Click="Button_Click"/>
        </Grid>
        <StackPanel
            Name="ToastPanel"
            Margin="0,80,30,0"
            HorizontalAlignment="Center"
            VerticalAlignment="Top" />
    </Grid>
</Window>

5、接着编写后台代码，添加一个ShowToast方法来生成一个Toast到ToastPanel

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        ShowToast("这是一个Toast");
    }

    public void ShowToast(string text, TimeSpan? time = null)
    {
        Toast toast = new Toast();
        toast.Content = text;
        toast.Margin = new Thickness(0, 10, 0, 0);
        ToastPanel.Children.Add(toast);
        if (time == null)
        {
            toast.SetTimeClose(TimeSpan.FromSeconds(5));
        }
        else
        {
            toast.SetTimeClose(time.Value);
        }
    }
}