I'm trying to restrict the characters that are valid in a textBox, so I
derived from System.Windows. Forms.TextBox, and overrode WndProc, catching
the key up/down messages... Everything works except the arrow keys - the
text cursor never moves. Why won't the arrows work? I know I'm catching
the correct WParam values...
protected override void WndProc(ref Message m)
{
if ((m.Msg == 256) || (m.Msg == 258))
{
int v = (int)m.WParam;
if ((v > (int)'0') && (v < (int)'9'))
{
base.WndProc (ref m);
return;
}
switch(v)
{
case 8: // Backspace
case 13: // Enter
case 33: // PgUp
case 34: // PgDn
case 35: // End
case 36: // Home
case 37: // Left
case 38: // Up
case 39: // Right
case 40: // Down
case 46: // Delete
base.WndProc(re f m);
break;
default:
break;
}
}
else
{
base.WndProc(re f m);
}
}
--
-mdb 1 2425
HI,
Instead of creating a new class just use the TextBox.KeyPres s event, there
you will get two properties
1- Handled that indicate that the key was hanbdle and it should be igonred.
2- KeyChar which is a char, y ou can use Char.Is(Control |Digit|Letter|e tc )
as needed.
cheers,
--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
"mdb" <m_b_r_a_y@c_t_ i_u_s_a__d0t__c om> wrote in message
news:Xn******** *************** *****@207.46.24 8.16... I'm trying to restrict the characters that are valid in a textBox, so I derived from System.Windows. Forms.TextBox, and overrode WndProc, catching the key up/down messages... Everything works except the arrow keys - the text cursor never moves. Why won't the arrows work? I know I'm catching the correct WParam values...
protected override void WndProc(ref Message m) { if ((m.Msg == 256) || (m.Msg == 258)) { int v = (int)m.WParam;
if ((v > (int)'0') && (v < (int)'9')) { base.WndProc (ref m); return; }
switch(v) { case 8: // Backspace case 13: // Enter case 33: // PgUp case 34: // PgDn case 35: // End case 36: // Home case 37: // Left case 38: // Up case 39: // Right case 40: // Down case 46: // Delete base.WndProc(re f m); break; default: break; } } else { base.WndProc(re f m); } }
-- -mdb This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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