CXTCheckListBox Horizontal Scrolling
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URL: http://forum.codejock.com/forum_posts.asp?TID=10678
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Topic: CXTCheckListBox Horizontal Scrolling
Posted By: devam
Subject: CXTCheckListBox Horizontal Scrolling
Date Posted: 19 May 2008 at 6:52am
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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...  ------------- DC |
Replies:
Posted By: mgampi
Date Posted: 19 May 2008 at 11:03am
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Hi;
what about adding a OnHScroll handler and after calling the base class implementation do a simple window refresh? ------------- Martin Product: Xtreme Toolkit v 19.0.0, new Projects v 19.1.0 Platform: Windows 10 v 1909 (64bit) Language: VC++ 2017 |
Posted By: devam
Date Posted: 20 May 2008 at 1:22am
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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? ------------- DC |
Posted By: mgampi
Date Posted: 20 May 2008 at 3:03am
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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 ------------- Martin Product: Xtreme Toolkit v 19.0.0, new Projects v 19.1.0 Platform: Windows 10 v 1909 (64bit) Language: VC++ 2017 |
Posted By: devam
Date Posted: 20 May 2008 at 3:11am
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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. ------------- DC |
Posted By: mgampi
Date Posted: 20 May 2008 at 3:13am
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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... ------------- Martin Product: Xtreme Toolkit v 19.0.0, new Projects v 19.1.0 Platform: Windows 10 v 1909 (64bit) Language: VC++ 2017 |