Question

嘿伙计们（我正在研究这个由缩放功能组成的项目。现在，我正面临这个问题，我使用的缩放功能需要四个鼠标事件，鼠标滚轮，鼠标左键按钮但是，我试图让它像点击按钮一样，最终可以执行缩放功能。但是，我在使用按钮调用鼠标事件功能时遇到了问题。这是代码，请帮帮我（：非常感谢DDDDD

private void image_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) 
{ 
    imagePicture.CaptureMouse(); 
    var tt = (TranslateTransform)((TransformGroup)imagePicture.RenderTransform).Children.First(tr => tr is TranslateTransform); 
    start = e.GetPosition(border); 
    origin = new Point(tt.X, tt.Y);

}

private void image_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) 
{ 
    imagePicture.ReleaseMouseCapture(); 
}

private void image_MouseMove(object sender, MouseEventArgs e) 
{ 
    if (!imagePicture.IsMouseCaptured) return;

    var tt = (TranslateTransform)((TransformGroup)imagePicture.RenderTransform).Children.First(tr => tr is TranslateTransform); 
    Vector v = start - e.GetPosition(border); 
    tt.X = origin.X - v.X; 
    tt.Y = origin.Y - v.Y; 
}

private void image_mousewheel(object sender, MouseWheelEventArgs e) 
{
    TransformGroup transformGroup = (TransformGroup)imagePicture.RenderTransform; 
    ScaleTransform transform = (ScaleTransform)transformGroup.Children[0]; 
    RenderOptions.SetBitmapScalingMode(imagePicture, BitmapScalingMode.NearestNeighbor);

    double zoom = e.Delta > 0 ? .01 : -.01;

    transform.ScaleX += zoom; transform.ScaleY += zoom;
}

同样，我的问题是如何在按钮被点击时执行这四个鼠标事件功能，而不是在鼠标被带到图像时能够直接缩放。对于您的信息，称为图像的名称（图像）。我尝试过绑定方法，不幸的是它不起作用;（

的问候。

Answer 1

设置bool例如：

，而不是设置ImageCapture并对其进行测试

变化：

imagePicture.CaptureMouse();

为：

buttonIsDown = true;
imagePicture.CaptureMouse();

和

imagePicture.ReleaseMouseCapture();

为：

imagePicture.ReleaseMouseCapture();
buttonIsDown = false;

然后您可以使用：

进行测试

if (buttonIsDown)

哪种方法可能会更好。

Answer 2

您可以让按钮调用外部DLL（user32.dll）来模仿真实的鼠标事件。首先在代码之上添加：

using System.Runtime.InteropServices;

然后在你班上有这些行：

   [DllImport("user32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
   public static extern void mouse_event(long dwFlags, long dx, long dy, long cButtons, long dwExtraInfo);
   private const int MOUSEEVENTF_LEFTDOWN = 0x02;
   private const int MOUSEEVENTF_LEFTUP = 0x04;
   private const int MOUSEEVENTF_RIGHTDOWN = 0x08;
   private const int MOUSEEVENTF_RIGHTUP = 0x10;

最后有这样的功能模仿当前光标位置的“真实”点击：

public void DoMouseClick()
{
      //Call the imported function with the cursor's current position
      int X = Cursor.Position.X;
      int Y = Cursor.Position.Y;
      mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, X, Y, 0, 0);
}

（取自here，将代码复制为镜像以防链接无法使用）

Button调用鼠标事件函数。:)

2 个答案: