Simulate DoubleClick

Question

How can I programatically throw a doubleclick to select a row in a datagrid. I am able to trap the enter key now I would like to have it throw the double click event.
Thanks,
John

jrosa · Answer

I found my solution. The trick is a to send a WM_LBUTTONDOWN, then WM_LBUTTONUP, then WM_LBUTTONDBLCLK, then WM_LBUTTONUP. This triggers the controls double click event.
Here is the code that works for me:
public const int WM_LBUTTONDOWN = 513; // 0x0201
public const int WM_LBUTTONUP = 514; // 0x0202
public const int WM_LBUTTONDBLCLK = 515; //0x0203
[System.Runtime.InteropServices.DllImport("user32.dll")]
static extern bool SendMessage(IntPtr hWnd, Int32 msg, Int32 wParam, Int32 lParam);
static int MakeLong(int LoWord, int HiWord)
{
return (HiWord << 16) | (LoWord & 0xffff);
}
protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData)
{
if(msg.WParam.ToInt32() == (int) Keys.Enter)
{
System.Windows.Forms.MouseEventArgs e;
int row = this.CurrentRowIndex;
//get a point to click
Rectangle rect = this.GetCellBounds(row, 0);
Int32 lparam = MakeLong(rect.Left - 4, rect.Top + 4);
//double click it
SendMessage( this.Handle, WM_LBUTTONDOWN, 0, lparam);
SendMessage( this.Handle, WM_LBUTTONUP, 0, lparam);
SendMessage( this.Handle, WM_LBUTTONDBLCLK, 0, lparam);
SendMessage( this.Handle, WM_LBUTTONUP, 0, lparam);
return false;
}
return base.ProcessCmdKey(ref msg, keyData);
}
I hope this helps someone else.
Regards,
John