TStringGrid component with TListBox inside

This is a discussion on TStringGrid component with TListBox inside within the Windows Programming forums, part of the Platform Specific Boards category; Hi all, I'm programming a component that is a derivate from TStringGrid. I want to put inside a TListBox component, ...

  1. #1
    Daniel Pertin
    Guest

    TStringGrid component with TListBox inside

    Hi all,

    I'm programming a component that is a derivate from TStringGrid. I want to put inside a TListBox component, so in each cell of the grid I'll be able to have multiple Items. (Well, in fact it isn't a TListBox rather than an own component derivated from it, but for the question, it should be enough with that infomration).

    I Associated the TListBox to the TStringGrid with:
    Code:
    TStringList1->Objects[x][y]=objListBox;
    I don't want to use scrolling inside each cell (it appears awfull), so when I add an Item in a TListBox inside a Cell, I grow up the Height of the TListBox, and the RowHeights[ARow].

    Well, I have override the DrawCell method of the TStringGrid, so I can draw the TListBox.

    Code:
    void __fastcall TBitmapStringGrid::DrawCell(int ACol, int ARow, const Types::TRect &ARect, TGridDrawState AState)
    {
        TListBox* objListBox = ( TListBox* )(Objects[ACol][ARow] );
    
        if (objListBox != NULL) //only if there are data
        {
          objListBox->Top  = ARect.Top;
          objListBox->Left = ARect.Left;
          objListBox->Height = ARect.Bottom - ARect.Top + 1;
          objListBox->Width  = ARect.Right - ARect.Left + 1;
          objListBox->Visible = True;
        }
        Canvas->Brush->Color=clWhite;
        Canvas->FillRect(ARect);
    }
    The problem is that when I scroll, it does extrange things. It overwrites the blank cells, and I'm unable to get that it scrolls correctly. The TlistBox component don't scroll when the TStrginGrid scroll.

    I Read in http://www.bridgespublishing.com/art...ds__part_I.htm
    that (obviously) it's a known issue of this, but I'm unable to find a solution.

    Help please!
    Regards,
    Daniel

  2. #2
    End Of Line Hammer's Avatar
    Join Date
    Apr 2002
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    6,231
    Thread moved to the Windows forum.
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
    Daniel Pertin
    Guest
    Where're the Windows Forum? I thought that this was the windows programming forum :?

    Regards,
    Daniel

  4. #4
    End Of Line Hammer's Avatar
    Join Date
    Apr 2002
    Posts
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    Originally posted by Daniel Pertin
    Where're the Windows Forum? I thought that this was the windows programming forum :?

    Regards,
    Daniel
    The thread was originally in the C++ forum, I moved it to the Windows forum as it's a Windows specific question, that's all.
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

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