.net 如何将鼠标滚轮事件传输到WindowsFormsHost?
我在WPF应用程序中有一个WinForms控件。幸运的是,在WPF中,鼠标滚轮事件通常由鼠标光标下的控件处理。。。但是如果它是WinForms控件,我必须首先单击该控件以使其具有键盘焦点。当WinForms控件没有焦点时,如何绕过此行为并将鼠标滚轮事件发送到WinForms控件.net 如何将鼠标滚轮事件传输到WindowsFormsHost?,.net,wpf,mousewheel,windowsformshost,.net,Wpf,Mousewheel,Windowsformshost,我在WPF应用程序中有一个WinForms控件。幸运的是,在WPF中,鼠标滚轮事件通常由鼠标光标下的控件处理。。。但是如果它是WinForms控件,我必须首先单击该控件以使其具有键盘焦点。当WinForms控件没有焦点时,如何绕过此行为并将鼠标滚轮事件发送到WinForms控件 (注意:mouseweeel和PreviewMouseWheel事件似乎不适用于WindowsFormsHost。如果在WindowsFormsHost的父级中添加PreviewMouseWheel的处理程序,则当鼠标位
(注意:
mouseweee
l和PreviewMouseWheel
事件似乎不适用于WindowsFormsHost。如果在WindowsFormsHost的父级中添加PreviewMouseWheel
的处理程序,则当鼠标位于非WPF控件的顶部时不会调用它。显然,WinForms控件没有MouseWheel
ev。)一个可能的解决方案是处理所有WM_mouseweel
消息,并手动为未聚焦的控件引发mouseweel
事件。我的附加行为实现了这一想法:
public static class CaptureMouseWheelWhenUnfocusedBehavior
{
private static readonly HashSet<WindowsFormsHost> TrackedHosts =
new HashSet<WindowsFormsHost>();
private static readonly System.Windows.Forms.IMessageFilter MessageFilter =
new MouseWheelMessageFilter();
private sealed class MouseWheelMessageFilter : System.Windows.Forms.IMessageFilter
{
[DllImport("User32.dll"), SuppressUnmanagedCodeSecurity]
private static extern IntPtr WindowFromPoint(System.Drawing.Point point);
private static System.Drawing.Point LocationFromLParam(IntPtr lParam)
{
int x = (int)((((long)lParam) >> 0) & 0xffff);
int y = (int)((((long)lParam) >> 16) & 0xffff);
return new System.Drawing.Point(x, y);
}
private static bool ConsiderRedirect(WindowsFormsHost host)
{
var control = host.Child;
return control != null &&
!control.IsDisposed &&
control.IsHandleCreated &&
control.Visible &&
!control.Focused;
}
private static int DeltaFromWParam(IntPtr wParam)
{
return (short)((((long)wParam) >> 16) & 0xffff);
}
private static System.Windows.Forms.MouseButtons MouseButtonsFromWParam(IntPtr wParam)
{
const int MK_LBUTTON = 0x0001;
const int MK_MBUTTON = 0x0010;
const int MK_RBUTTON = 0x0002;
const int MK_XBUTTON1 = 0x0020;
const int MK_XBUTTON2 = 0x0040;
int buttonFlags = (int)((((long)wParam) >> 0) & 0xffff);
var buttons = System.Windows.Forms.MouseButtons.None;
if(buttonFlags != 0)
{
if((buttonFlags & MK_LBUTTON) == MK_LBUTTON)
{
buttons |= System.Windows.Forms.MouseButtons.Left;
}
if((buttonFlags & MK_MBUTTON) == MK_MBUTTON)
{
buttons |= System.Windows.Forms.MouseButtons.Middle;
}
if((buttonFlags & MK_RBUTTON) == MK_RBUTTON)
{
buttons |= System.Windows.Forms.MouseButtons.Right;
}
if((buttonFlags & MK_XBUTTON1) == MK_XBUTTON1)
{
buttons |= System.Windows.Forms.MouseButtons.XButton1;
}
if((buttonFlags & MK_XBUTTON2) == MK_XBUTTON2)
{
buttons |= System.Windows.Forms.MouseButtons.XButton2;
}
}
return buttons;
}
public bool PreFilterMessage(ref System.Windows.Forms.Message m)
{
const int WM_MOUSEWHEEL = 0x020A;
if(m.Msg == WM_MOUSEWHEEL)
{
var location = LocationFromLParam(m.LParam);
var hwnd = WindowFromPoint(location);
foreach(var host in TrackedHosts)
{
if(!ConsiderRedirect(host)) continue;
if(hwnd == host.Child.Handle)
{
var delta = DeltaFromWParam(m.WParam);
{
// raise event for WPF control
var mouse = InputManager.Current.PrimaryMouseDevice;
var args = new MouseWheelEventArgs(mouse, Environment.TickCount, delta);
args.RoutedEvent = WindowsFormsHost.MouseWheelEvent;
host.RaiseEvent(args);
}
{
// raise event for winforms control
var buttons = MouseButtonsFromWParam(m.WParam);
var args = new System.Windows.Forms.MouseEventArgs(
buttons, 0, location.X, location.Y, delta);
var method = typeof(System.Windows.Forms.Control).GetMethod(
"OnMouseWheel",
System.Reflection.BindingFlags.Instance |
System.Reflection.BindingFlags.NonPublic);
method.Invoke(host.Child, new object[] { args });
}
return true;
}
}
}
return false;
}
}
public static bool GetIsEnabled(DependencyObject obj)
{
return (bool)obj.GetValue(IsEnabledProperty);
}
public static void SetIsEnabled(DependencyObject obj, bool value)
{
obj.SetValue(IsEnabledProperty, value);
}
public static readonly DependencyProperty IsEnabledProperty =
DependencyProperty.RegisterAttached(
"IsEnabled",
typeof(bool),
typeof(CaptureMouseWheelWhenUnfocusedBehavior),
new PropertyMetadata(false, OnIsEnabledChanged));
private static void OnIsEnabledChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
var wfh = o as WindowsFormsHost;
if(wfh == null) return;
if((bool)e.NewValue)
{
wfh.Loaded += OnHostLoaded;
wfh.Unloaded += OnHostUnloaded;
if(wfh.IsLoaded && TrackedHosts.Add(wfh))
{
if(TrackedHosts.Count == 1)
{
System.Windows.Forms.Application.AddMessageFilter(MessageFilter);
}
}
}
else
{
wfh.Loaded -= OnHostLoaded;
wfh.Unloaded -= OnHostUnloaded;
if(TrackedHosts.Remove(wfh))
{
if(TrackedHosts.Count == 0)
{
System.Windows.Forms.Application.RemoveMessageFilter(MessageFilter);
}
}
}
}
private static void OnHostLoaded(object sender, EventArgs e)
{
var wfh = (WindowsFormsHost)sender;
if(TrackedHosts.Add(wfh))
{
if(TrackedHosts.Count == 1)
{
System.Windows.Forms.Application.AddMessageFilter(MessageFilter);
}
}
}
private static void OnHostUnloaded(object sender, EventArgs e)
{
var wfh = (WindowsFormsHost)sender;
if(TrackedHosts.Remove(wfh))
{
if(TrackedHosts.Count == 0)
{
System.Windows.Forms.Application.RemoveMessageFilter(MessageFilter);
}
}
}
}
更新:为WinForms控件添加了引发事件的代码您是否尝试在其鼠标悬停事件中设置wfh的焦点?否,但这将是不正确的行为:键盘焦点不应仅因为鼠标移动而改变。我的应用程序具有文本框,因此用户可能会注意到焦点以这种方式意外改变。
WindowsFormsHost
也不会接收MouseEnter
或MouseMove
事件,尽管它包含的控件会接收。这非常有效,只是它只将控制盘事件传递给WindowsFormsHost
,不会在WinForms控件上引发事件。如果您愿意,我可以使用调用Control.OnMouseWheel所需的基于反射的命令,该命令受保护,因此无法直接调用。以下是LocationFromLParam方法的改进版本,适用于多个监视系统:short x=(short)(((long)lParam)>>0和0xffff);short y=(short)((long)lParam)>>16和0xffff);返回新的System.Drawing.Point(x,y);
非常好!小补丁:OnMouseWheel事件参数应该包括客户端坐标,而不是屏幕坐标,因此需要转换它们:var clientpoint=host.Child.PointToClient(location);var args=new System.Windows.Forms.MouseEventArgs(按钮,0,clientpoint.X,clientpoint.Y,delta);
<WindowsFormsHost namespace:CaptureMouseWheelWhenUnfocusedBehavior.IsEnabled="True" />
CaptureMouseWheelWhenUnfocusedBehavior.SetIsEnabled(host, true);