WPF中的左/右手柄傾斜

Question

如何在WPF中處理左傾或右傾斜鼠標事件？ alt text http://s3images.coroflot.com/user_files/individual_files/featured/featured_1266_st_dVYgtBSHIQRPzXvrG4WnUW.jpg

Answer 1

我想出瞭如何在WPF UserControl中實現WndProc。在我的例子中，UserControl必須獲得一個類似於AppendWindow方法的窗口指針：

private static MyUserControl instanceWithFocus; 

public void AppendWindow(Window window) { 
    HwndSource source = HwndSource.FromHwnd(new WindowInteropHelper(window).Handle); 
    source.AddHook(new HwndSourceHook(WndProc)); 
} 

private static IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { 
    switch (msg) { 
     case Win32Messages.WM_MOUSEHWHEEL: 
      MouseWheelTilt(wParam, lParam); 
      handled = true; 
      break; 
     default: 
      break; 
    } 
    return IntPtr.Zero; 
} 

private static void MouseWheelTilt(IntPtr wParam, IntPtr lParam) { 
    Int32 tilt = (Int16)Utils.HIWORD(wParam); 
    Int32 keys = Utils.LOWORD(wParam); 
    Int32 x = Utils.LOWORD(lParam); 
    Int32 y = Utils.HIWORD(lParam); 

    // call an event on active instance of this object 
    if (instanceWithFocus != null) { 
     instanceWithFocus.MouseWheelTilt(tilt, keys, x, y); 
    } 
} 

private void MouseWheelTilt(Int32 tilt, Int32 keys, Int32 x, Int32 y) { 
    scrollViewer.ScrollToHorizontalOffset(scrollViewer.HorizontalOffset + tilt); 
} 

private void UserControl_MouseEnter(object sender, MouseEventArgs e) { 
    instanceWithFocus = this; 
} 

private void UserControl_MouseLeave(object sender, MouseEventArgs e) { 
    instanceWithFocus = null; 
} 

abstract class Win32Messages { 
    public const int WM_MOUSEHWHEEL = 0x020E; 
} 

abstract class Utils { 

    internal static Int32 HIWORD(IntPtr ptr) { 
     Int32 val32 = ptr.ToInt32(); 
     return ((val32 >> 16) & 0xFFFF); 
    } 

    internal static Int32 LOWORD(IntPtr ptr) { 
     Int32 val32 = ptr.ToInt32(); 
     return (val32 & 0xFFFF); 
    } 

}