Board index » cppbuilder » TComboBox at Runtime

2005-01-14 09:39:02 PM
cppbuilder11
Hi,
I got a StringGrid in my Application, and i would like to Show a ComboBox at
the top of the cell, when a cell in col 3 is clicked. i tried this:
TComboBox *temp_CB=NULL;
if( Reftab_SG->Col != 3)
{
ModeHinweis_Mem->Hide(); // HinweisPanel für Mode verstecken
if (temp_CB)
delete temp_CB; temp_CB=NULL;
}
else
{
ModeHinweis_Mem->Show(); // HinweisPanel für Mode anzeigen
if (lan)
{
[someCode]
}
else
{
[some Code]
}
temp_CB=new TComboBox(Reftab_SG);
temp_CB->Left=200;
temp_CB->Top=200;
temp_CB->Visible=true;
}
but i can't see anything, why?
Thanks!
 

Ron Eggler @ Work wrote:
TComboBox *temp_CB=NULL;
if( Reftab_SG->Col != 3)
{
ModeHinweis_Mem->Hide(); // HinweisPanel für Mode verstecken
if (temp_CB)
{
temp_CB->Visible=false;
delete temp_CB; temp_CB=NULL;
}
}
else
{
ModeHinweis_Mem->Show(); // HinweisPanel für Mode anzeigen
if (lan)
{
[someCode]
}
else
{
[someCode]
}
temp_CB=new TComboBox(this);
temp_CB->Parent=this;
temp_CB->Style=csDropDownList;
temp_CB->OnChange = temp_CBChange;
temp_CB->Left=Reftab_SG->Left;
temp_CB->Height=Reftab_SG->DefaultRowHeight;
temp_CB->Top=Reftab_SG->Top;
temp_CB->Visible=true;
temp_CB->Items->Add("Bit 1&0: 0=Speedmode, 1=absolute Pos. mode,
2=relative Pos. mode");
temp_CB->Items->Add("Bit 4: 1=Absolute Time(whole mov. Cmd), 0=Time
after mov. Cmd");
temp_CB->Items->Add("Bit 5: 1=Stop after this mov. Cmd, 0=Continue
with next mov. Cmd");
/*** [Code for positioning] ***/
TRect Rect = Reftab_SG->CellRect(Reftab_SG->Col,Reftab_SG->Row);
temp_CB->Top = Reftab_SG->Top;
temp_CB->Left = Reftab_SG->Left;
temp_CB->Text = EmptyStr;
temp_CB->Top = temp_CB->Top + Rect.Top + Reftab_SG->GridLineWidth+72;
temp_CB->Left = temp_CB->Left + Rect.Left +
Reftab_SG->GridLineWidth+8;
temp_CB->Height = (Rect.Bottom - Rect.Top);
temp_CB->Width = (Rect.Right - Rect.Left) + 2;
temp_CB->Visible = true;
temp_CB->SetFocus();
/*** [/Code for positioning] ***/
}
Where is the Error, what do i miss?
Thanks!
 

Ron Eggler @ Work wrote:
If you want quick help than post codesnippets that will work
when someone puts a TStringGrid and two TButtons on a TForm.
Do not change the names given by the IDE.
Hans.
 

{smallsort}

Hans Galema wrote:
temp_CB->Visible=false;
us, we should give names,to draw direct conclusions from.
 

"Ron Eggler @ Work" < XXXX@XXXXX.COM >wrote in message
has native support for what you are trying to accomplish manually. Simply
derive a new component from TStringGrid and override the CreateEditor()
method to return an instance of TInplaceEditList rather than the default of
TInplaceEdit. Also assign an event handler to the
TInplaceEditList::OnGetPickListItems event so that you can fill in the
drop-down list when needed.
If you are not using BCB6, then you can derive your own class from
TInplaceEdit to handle your ComboBox, and then the above still applies.
Gambit
 

Remy Lebeau (TeamB) wrote:
that.
Got it to work with perevious posted Code but the TComboBoxes don't
disappear anymore. :(