protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (_readOnly)
{
return(true);
}
if (msg.Msg == 256)
{
int key = msg.WParam.ToInt32();
if (key == 37) //left
{
mathExp.SelectPrevious();
this.Refresh();
return(true);
}
else if (key == 39) //right
{
mathExp.SelectNext();
this.Refresh();
return(true);
}
else if (key == 0x2d) //insert
{
mathExp.AddEmptyNode();
this.Refresh();
_changed = true;
return(true);
}
else if (key == 0x2e) //delete
{
mathExp.DeleteSelectedNode();
RefreshVariableMap();
this.Refresh();
_changed = true;
return(true);
}
else if (key == 8) //backspace
{
mathExp.Backspace();
RefreshVariableMap();
this.Refresh();
_changed = true;
return(true);
}
else if (key == 38) //up
{
mathExp.OnKeyUp();
_changed = true;
this.Refresh();
return(true);
}
else if (key == 40) //down
{
mathExp.OnKeyDown();
_changed = true;
this.Refresh();
return(true);
}
}
else if (msg.Msg == 255)
{
return(true);
}
return(base.ProcessCmdKey(ref msg, keyData));
}