根据鼠标位置移动wpf按钮,但它在闪烁
本文关键字:闪烁 按钮 wpf 鼠标 位置 移动 | 更新日期: 2023-09-27 18:19:51
我试图根据鼠标位置移动按钮,但移动按钮时按钮会闪烁。请找到下面的代码,
XAML代码下方,
<Button Name="Samplebutton"
PreviewMouseDown="Samplebutton_PreviewMouseDown"
PreviewMouseUp="Samplebutton_PreviewMouseUp"
PreviewMouseMove="Samplebutton_PreviewMouseMove"
Content="Moving" Width="100" Height="35"/>
CS,
private bool m_IsPressed = false;
private void Samplebutton_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
if (e.ChangedButton == MouseButton.Left)
{
m_IsPressed = true;
}
else
{
m_IsPressed = false;
}
}
private void Samplebutton_PreviewMouseUp(object sender, MouseButtonEventArgs e)
{
m_IsPressed = false;
}
private void Samplebutton_PreviewMouseMove(object sender, MouseEventArgs e)
{
if (m_IsPressed)
{
TranslateTransform transform = new TranslateTransform();
transform.X = Mouse.GetPosition(sender as Button).X;
transform.Y = Mouse.GetPosition(sender as Button).Y;
this.Samplebutton.RenderTransform = transform;
}
}
有人能提供你的建议吗?
您的"闪烁"是由PreviewMouseMove
处理程序中的转换引起的。
使用鼠标相对于Button控件的位置变换控件的X和Y位置,每次应用变换时,该位置都会更改。每次按钮位置改变时,您的Mouse.GetPosition(sender as Button).X
&Y
将返回不同的值,导致按钮再次改变位置,依此类推
一种解决方法是从父元素(例如,具有固定位置的Grid
、Canvas
)获取鼠标位置:
<Grid Name="myGrid">
<Button Name="Samplebutton"
PreviewMouseDown="Samplebutton_PreviewMouseDown"
PreviewMouseUp="Samplebutton_PreviewMouseUp"
PreviewMouseMove="Samplebutton_PreviewMouseMove"
Content="Moving" Width="100" Height="35"/>
</Grid>
和
private void Samplebutton_PreviewMouseMove(object sender, MouseEventArgs e)
{
if (m_IsPressed)
{
TranslateTransform transform = new TranslateTransform();
transform.X = Mouse.GetPosition(myGrid).X;
transform.Y = Mouse.GetPosition(myGrid).Y;
this.Samplebutton.RenderTransform = transform;
}
}
这不会是世界上最漂亮的东西,因为它会从左上角"抓住"按钮,但你可以调整位置以获得你想要的行为。
祝你好运。
编辑:如果你不想显式地命名你想用于相对位置的元素,你应该可以通过查询sender
对象来选择直接父元素:
transform.X = Mouse.GetPosition((sender as Button).Parent as FrameworkElement).X;
private void button_PreviewMouseDown_1(object sender, MouseButtonEventArgs e)
{
button.CaptureMouse();
}
private void button_PreviewMouseUp_1(object sender, MouseButtonEventArgs e)
{
button.ReleaseMouseCapture();
}
private void button_PreviewMouseMove_1(object sender, MouseEventArgs e)
{
if (button.IsMouseCaptured)
{
Canvas.SetLeft(button, e.GetPosition(this).X);
Canvas.SetTop(button, e.GetPosition(this).Y);
}
}