Codejock Developer Community : CXTCheckListBox Horizontal Scrolling

CXTCheckListBox Horizontal Scrolling : Hi; you dont have to create...

Tue, 20 May 2008 03:13:22 +0000

Author: mgampi
Subject: 10678
Posted: 20 May 2008 at 3:13am

Hi;

you dont have to create your own class from scratch. Only derive it to handle WM_HSCROLL. This requires about 15 minutes to be realized...

CXTCheckListBox Horizontal Scrolling : What you are suggesting is to...

Tue, 20 May 2008 03:11:38 +0000

Author: devam
Subject: 10678
Posted: 20 May 2008 at 3:11am

What you are suggesting is to create a class of my own for the control that I am using. That is the correct approach, but is not feasible for my project currently due to lack of time and resources.

I was wondering if there is any workaround through which I could properly handle the horizontal scrollbar while keeping the CXTPCheckListBox as a control within the dialog, and not creating a class for it.

Thanks a lot for the suggestion, but a little insight on this workaround, if possible, would be greatly appreciated.

CXTCheckListBox Horizontal Scrolling : Hi; You have to derive from CXTPCheckListBox...

Tue, 20 May 2008 03:03:10 +0000

Author: mgampi
Subject: 10678
Posted: 20 May 2008 at 3:03am

Hi;

You have to derive from CXTPCheckListBox class and handle WM_HSCROLL there.

Then declare a dialog member variable of type of the derived class and in DoDataExchange do a DDX_Control().

HTH

CXTCheckListBox Horizontal Scrolling : Thanks for the suggestion but...

Tue, 20 May 2008 01:22:08 +0000

Author: devam
Subject: 10678
Posted: 20 May 2008 at 1:22am

Thanks for the suggestion but I tried that as well. Problem is that I have a dialog on which the CCheckListBox is a control.

So, since I do not have a wrapper class over the control, I cannot handle WM_HSCROLL message. If I do, it will get handled for the dialog class and not the control.

Is there any way in which I can handle the message while keeping the CheckListBox as a control within a dialog?

CXTCheckListBox Horizontal Scrolling : Hi; what about adding a OnHScroll...

Mon, 19 May 2008 11:03:23 +0000

Author: mgampi
Subject: 10678
Posted: 19 May 2008 at 11:03am

Hi;

what about adding a OnHScroll handler and after calling the base class implementation do a simple window refresh?

CXTCheckListBox Horizontal Scrolling : Hi, I have used CXTCheckListBox...

Mon, 19 May 2008 06:52:03 +0000

Author: devam
Subject: 10678
Posted: 19 May 2008 at 6:52am

Hi,

I have used CXTCheckListBox in my project and need horizontal scrollbars in the same.

While creating the list box I have specified the WS_HSCROLL property, but that is not enough for CXTCheckListBoxes. By surfing and a little research I came up with the following code which successfully adds a Horizontal scrollbar to my CXTCheckListBox :

    CString cstr;
    CSize   sz;
    int     iMaxLength = 0;
    CDC*    pDC = m_UnroutedTrailsList.GetDC();
    for (int i = 0; i < m_UnroutedTrailsList.GetCount(); i++)
    {
        m_UnroutedTrailsList.GetText(i, cstr);
        sz = pDC->GetTextExtent(cstr);

        if (sz.cx > iMaxLength)
        {
            iMaxLength = sz.cx;
        }
    }

m_UnroutedTrailsList.ReleaseDC(pDC);

    // Set the horizontal extent so every character of all strings
    // can be scrolled to.
    m_UnroutedTrailsList.SetHorizontalExtent(iMaxLength);

But the problem is that when I scroll the list box horizontally, the strings are not displayed properly. I think there is some refresh problem. The strings are incorrectly drawn (overlap) as I scroll the listbox. The strings get correctly displayed when I click on any item within the CheckListBox.

Can anyone please help me to fix this display problem so that the horizontal scrollbar can behave normally with a CXTCheckListBox?

An early response is eagerly awaited...