Listview control - Please help me !!!

Question on listview control:

In my superclassed listview control I use images in some

of the list items. These have transparent backgrounds.

However, when I select a row, the transparent background is not

selected, it is still the background colour of the control.

How can I tell the control to select the transparent

background of the control as well?

Is this ownerdrawn stuff?


Thanks,

Charles Gamble.

Did you specify a mask when you created the ImageList? (ILC_MASK)

Here's the code where I create the imagelist and add it to the control:

// Create and initialize image list used with control

hImageList = ImageList_Create(16,16,ILC_COLORDDB|ILC_MASK,14,1);

hBitmap = LoadBitmap(hInstance,MAKEINTRESOURCE(IDB_IMAGELIST));

// Add images to image list

ImageList_AddMasked(hImageList,hBitmap,RGB(0,255,255));

DeleteObject(hBitmap);

ImageList_SetBkColor(hImageList, CLR_NONE);

// Set image list of list view

SendMessage(LVM_SETIMAGELIST,(WPARAM)LVSIL_SMALL, (LPARAM)hImageList);

Any ideas?


Charles.

That looks right. The only thing I do differently is pass white (RGB(255,255,255)) to AddMasked.

I have enclosed some more code which describes how I add two of my columns

to the listview control. I am using ATL 3.0, but the principles are the same.

LVCOLUMN colDetails;

colDetails.mask = LVCF_WIDTH;

colDetails.cx = 30;

SendMessage(LVM_INSERTCOLUMN,nColumnIndex,(LPARAM)&colDetails);

nPriorityIndex = nColumnIndex;

nColumnIndex++;

SendMessage(LVM_INSERTCOLUMN,nColumnIndex,(LPARAM)&colDetails);

nStatusIndex = nColumnIndex;

nColumnIndex++;

--------(The image list is created here, using the code I sent previously)

// Get listview header

hHeader = ListView_GetHeader(m_hWndCD);

HDITEM hd;

hd.mask = HDI_FORMAT|HDI_LPARAM|HDI_IMAGE;

hd.fmt = HDF_LEFT|HDF_IMAGE;

hd.iImage = 0;

hd.lParam = ePriority;

// Set header images and LPARAM information (used to identify columns)

SendMessage(hHeader, HDM_SETITEM, nPriorityIndex, (LPARAM)&hd);

hd.iImage = 1;

hd.lParam = eStatus;

SendMessage(hHeader, HDM_SETITEM, nStatusIndex, (LPARAM)&hd);

I have my own function which selects the listview items as I want to send

events back to the container when items are selected. Below is the selecting

part of it:

// Deselect currently selected item

lvItem.state = 0;

int i = SendMessage(LVM_SETITEMSTATE, (WPARAM)-1,

(LPARAM)&lvItem);

// Select new item

lvItem.state = LVIS_SELECTED;

i = SendMessage(LVM_SETITEMSTATE, (WPARAM)HitTestInf.iItem,

(LPARAM)&lvItem);

So my main problems are that the transparent backgrounds of images are not

being highlighted when an item is selected. Also, when an image is set in the header control, there must be an image in

the column contents or else a blank space is left.

Here is the code where I add items:

// Insert item into list

lvItem.mask = LVIF_PARAM;

lvItem.iItem = SendMessage(LVM_GETITEMCOUNT, 0, 0);

lvItem.iSubItem = 0;

lvItem.lParam = (LPARAM)ActivityDetails;

SendMessage(LVM_INSERTITEM,(WPARAM)0,(LPARAM)&lvItem);

// Add Priority information

// Assign mask to text and image here, otherwise the image

// from the column header is displayed in the row

lvItem.mask = LVIF_TEXT|LVIF_IMAGE;

lvItem.iSubItem = 0

lvItem.pszText = OLE2T(bsPriority);

lvItem.cchTextMax = _tcslen(lvItem.pszText);

SendMessage(LVM_SETITEM,(WPARAM)0,(LPARAM)&lvItem);

// Add Status information

lvItem.mask = LVIF_IMAGE;

lvItem.iSubItem = 1;

lvItem.iImage = 4

SendMessage(LVM_SETITEM,0,(LPARAM)&lvItem);

Any ideas?

Are you having these problems? If not, maybe you could send me some of your

code?

Thanks for the help anyway.


Charles.

If you were using OWNER_DRAWn listview ctrl you could specify ILD_TRANSPARENT flag when drawing icon image yourself:

CImageList *pImageList = listView.GetImageList(LVSIL_SMALL);
if(pImageList) {
POINT pt;
pt.x = lpDrawItem->rcItem.left;
pt.y = lpDrawItem->rcItem.top;
pImageList->Draw(&dc, lvi.iImage, pt, ILD_TRANSPARENT);
}

check out with the ILD_TRANSPARENT style
make use of ImageList_DrawEx()function in which
u can set this style