/// <summary>
/// Function to process the messages through the installed message filters.
/// </summary>
/// <param name="hwnd">Window handle receiving the message.</param>
/// <param name="msg">Message being received.</param>
/// <param name="wParam">Window parameter 1.</param>
/// <param name="lParam">Window parameter 2.</param>
/// <returns>The result of a call to the previous window procedure if the message was not processed, or <see cref="IntPtr.Zero"/> if the message was processed.</returns>
private IntPtr NewWndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam)
{
if (!_hooked)
{
UninstallWindowProcedure();
return(UserApi.CallWindowProc(_defaultWndProc, hwnd, msg, wParam, lParam));
}
var windowMessage = new Message
{
HWnd = hwnd,
Msg = msg,
WParam = wParam,
LParam = lParam
};
// Send a copy of the message to any installed filters.
// ReSharper disable once LoopCanBeConvertedToQuery
// ReSharper disable once ForCanBeConvertedToForeach
for (int i = 0; i < _messageFilters.Count; i++)
{
// ReSharper disable once InconsistentlySynchronizedField
IMessageFilter filter = _messageFilters[i];
if (filter.PreFilterMessage(ref windowMessage))
{
return(windowMessage.Result);
}
}
return(UserApi.CallWindowProc(_defaultWndProc, hwnd, msg, wParam, lParam));
}
/// <summary>Hook callback to process <see cref="WM.WM_MOUSEMOVE" /> messages to move the thumbnail along with the cursor.</summary>
/// <param name="nCode">The message being received.</param>
/// <param name="wParam">Additional information about the message.</param>
/// <param name="lParam">Additional information about the message.</param>
/// <returns>A zero value if the procedure processes the message; a nonzero value if the procedure ignores the message.</returns>
protected IntPtr MouseHookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0)
{
switch ((WM)wParam)
{
case WM.WM_MOUSEMOVE:
MSLLHOOKSTRUCT hookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
Point cursorPosition = new Point(hookStruct.pt.x, hookStruct.pt.y);
SetWindowPosition(cursorPosition);
{
var msg = new Message()
{
HWnd = Handle,
LParam = lParam,
WParam = wParam,
Msg = (int)WM.WM_MOUSEMOVE,
};
Invoke(new Action(() => m_messageFilter.PreFilterMessage(ref msg)));
}
break;
case WM.WM_LBUTTONUP:
{
var msg = new Message()
{
HWnd = Handle,
LParam = lParam,
WParam = wParam,
Msg = (int)WM.WM_LBUTTONUP,
};
Invoke(new Action(() => m_messageFilter.PreFilterMessage(ref msg)));
}
break;
default:
break;
}
}
return(User32.CallNextHookEx(m_hookId, nCode, wParam, lParam));
}
public static bool FilterMessage(ref Message message)
{
lock (message_filters) {
for (int i = 0; i < message_filters.Count; i++)
{
IMessageFilter filter = (IMessageFilter)message_filters[i];
if (filter.PreFilterMessage(ref message))
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// 本函数实现 System.Windows.Forms.IMessageFilter接口的PreFilterMessage函数,用于对当前应用程序的消息进行预处理
/// </summary>
/// <remarks>本过滤器处理了鼠标按钮按下时间和键盘事件以及鼠标滚轮事件,
/// 若鼠标在本列表边框外部按下则表示认为用户想要关闭列表,此时立即关闭本列表窗体
/// 此外本函数还处理汉语拼音辅助定位列表元素
/// 用户可用上下光标键或者上下翻页键来滚动列表,用空格或回车来进行选择</remarks>
/// <param name="m">当前消息队列中的消息对象</param>
/// <returns>true 当前消息其他程序不可处理(本消息被吃掉了) false本消息还可被其他程序处理</returns>
public virtual bool PreFilterMessage(ref System.Windows.Forms.Message m)
{
bool eatMessage = false;
if (this.IsDisposed || this.Disposing || this.Visible == false)
{
// 若对象被销毁了或列表不显示则删除本消息过滤器
System.Windows.Forms.Application.RemoveMessageFilter(this);
return(false);
}
Win32Message msg = new Win32Message(m);
// 获得窗体的绝对位置和大小
System.Drawing.Rectangle BoundsRect = this.Bounds;
// 鼠标在客户区的按键按下消息
// Mouse was pressed in a window of this application
if (msg.IsMouseDownMessage)
{
if (msg.Msg == (int)Msgs.WM_LBUTTONDOWN ||
msg.Msg == (int)Msgs.WM_MBUTTONDOWN ||
msg.Msg == (int)Msgs.WM_RBUTTONDOWN ||
msg.Msg == (int)Msgs.WM_XBUTTONDOWN)
{
System.Drawing.Point mousePos = msg.ScreenMousePosition;
bolExitLoop = !BoundsRect.Contains(mousePos);
msgBack = m;
eatMessage = bolExitLoop;
if (bolExitLoop)
{
if (IsChildWindow(m.HWnd))
{
bolExitLoop = false;
}
WindowInformation info = new WindowInformation(this.Handle);
if (info.Enabled == false)
{
// 窗体不可用，很可能正在显示对话框使得本窗体暂时不可用
bolExitLoop = false;
}
//else
//{
// this.UserProcessState = WinForms.UserProcessState.Accept;
//}
return(true);
}
}
}
// 鼠标在非客户区的按键按下消息
// Mouse was pressed in a window of this application
if ((m.Msg == (int)Msgs.WM_NCLBUTTONDOWN) ||
(m.Msg == (int)Msgs.WM_NCMBUTTONDOWN) ||
(m.Msg == (int)Msgs.WM_NCRBUTTONDOWN) ||
(m.Msg == (int)Msgs.WM_NCXBUTTONDOWN))
{
System.Drawing.Point mousePos = msg.MousePosition;
bolExitLoop = !BoundsRect.Contains(mousePos);
//eatMessage = true;
msgBack = m;
eatMessage = bolExitLoop;
if (bolExitLoop)
{
if (IsChildWindow(m.HWnd))
{
bolExitLoop = false;
}
WindowInformation info = new WindowInformation(this.Handle);
if (info.Enabled == false)
{
// 窗体不可用，很可能正在显示对话框使得本窗体暂时不可用
bolExitLoop = false;
}
//else
//{
// this.UserProcessState = WinForms.UserProcessState.Accept;
//}
return(true);
}
}
if (this.RuntimeContentControl is IMessageFilter)
{
WindowInformation info = new WindowInformation(this.Handle);
//if (info.Enabled)
{
IMessageFilter mf = (IMessageFilter)this.RuntimeContentControl;
return(mf.PreFilterMessage(ref m));
}
}
return(eatMessage);
}