按下鼠标左键时更改鼠标光标? [英] Change mouse cursor while left mouse button is pressed?

问题描述

我需要在按下鼠标左键的同时更改鼠标光标.不幸的是，直到释放鼠标左键，鼠标光标的更改才会被忽略.有什么解决方法吗?谢谢您的提示！

I need to change the mouse cursor while the left mouse button is pressed. Unfortunately changes to the mouse cursor are ignored until the left mouse button is released. Is there any workaround to this? Thanks for any hint!

(我正在使用WPF和C#)

(I'm using WPF and C#)

示例项目: http://cid-0432ee4cfe9c26a0.skydrive.live .com/self.aspx/％c3％96ffentlich/WpfApplication5.zip (只要运行它，说明就会显示在应用程序中)

Sample Project: http://cid-0432ee4cfe9c26a0.skydrive.live.com/self.aspx/%c3%96ffentlich/WpfApplication5.zip (just run it, instructions are shown in the application)

示例代码:

XAML:

<Window x:Class="WpfApplication5.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="695" Loaded="Window_Loaded">
<Grid>
    <Button Content="Button1" Height="287" HorizontalAlignment="Left" Margin="12,12,0,0" Name="button1" VerticalAlignment="Top" Width="235" />
    <Button Content="Button2" Height="287" HorizontalAlignment="Left" Margin="284,12,0,0" Name="button2" VerticalAlignment="Top" Width="278" MouseMove="button2_MouseMove" />
</Grid>

窗口类:

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

    private void button2_MouseMove(object sender, MouseEventArgs e)
    {
        Cursor = Cursors.Cross;
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        button1.Content="Step1: Left click on this button, \nhold down the left mouse button";
        button2.Content = "(Make sure you don't hover this\n button before hovering Button1.\n Default application cursor\n is the normal arrow cursor)\n\n Step 2: Keep on holding the left mouse \nbutton, hover this button\n\nThe cursor won't change. (It will change after the \nleft mouse button was released)";
    }
}

推荐答案

我建议在可能的情况下使用Preview *事件进行视觉更改，因为这将使您的逻辑保持良好的分离.另外，最好(IMHO)使用Mouse.OverrideCursor属性临时更改光标.

I would recommend using Preview* events where possible for visual changes, as it will keep your logic nicely separated. Also, it is best (IMHO) to use the Mouse.OverrideCursor property to change the cursor temporarily.

例如:

void Window_Loaded(object sender, RoutedEventArgs e)
{
    // ...
    button1.PreviewMouseLeftButtonDown += Button1_PreviewMouseLeftButtonDown;
    button1.PreviewMouseLeftButtonUp += Button1_PreviewMouseLeftButtonUp;
}

void Button1_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    Mouse.OverrideCursor = Cursors.Cross;
    Mouse.Capture(button1);
}

void Button1_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
    Mouse.Capture(null);
    Mouse.OverrideCursor = null;
}

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