当按下鼠标左键时更改鼠标指针？

Question

当按下鼠标左键时更改鼠标指针？

c#wpfmouse-cursor

4

我需要在按下左键时改变鼠标指针。不幸的是，直到左键释放后，对鼠标指针的更改才会被忽略。有没有任何解决方法？感谢任何提示！（我正在使用WPF和C＃）

编辑：示例项目：http://cid-0432ee4cfe9c26a0.skydrive.live.com/self.aspx/%c3%96ffentlich/WpfApplication5.zip（只需运行它，应用程序中会显示说明）

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)";
    }
}

- stefan.at.wpf

你正在使用 MouseLeftButtonDown 还是 MouseLeftButtonClick 事件？ - Ozan

你好Ozan，我正在使用MouseLeftButtonDown。我在上面添加了一个示例。 - stefan.at.kotlin

2个回答

0

在鼠标左键按下处理程序中，您可以编写以下代码。

try
{
   Cursor = Cursors.WaitCursor;
}
catch(Exception ex)
{
}
finally
{
   Cursor = Cursors.Default;
}

您可以根据需要将光标重置为默认值。

- Pabitra Dash

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Dennis · Accepted Answer

我建议在可能的情况下使用预览事件来进行视觉上的更改，因为这将使您的逻辑保持良好的分离。此外，最好（在我看来）使用Mouse.OverrideCursor属性暂时更改光标。

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;
}