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

Simulate DoubleClick

Answers (1)