ListView - some missing events/properties

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   Hi Codejock,

In trying to implement a 'file list' type control using the Codejock ListView I came across a few missing features.

Basically, loading the icons for each item is time consuming if there are a large number of files. The correct way to go about it is to load icons for each item as needed and then cache. This would be fine BUT:

1. There's no ListView_Scroll event and so no way to detect when items icons might need loading.
2. There's no ListViewItem.IsVisible property (I see the ListView.GetFirstVisible method, but then I need to check following items are visible or not)

I'm not even sure if the above 'missing' features would accurately solve the problem anyway (sort order would affect things also I imagine).

Maybe this could be done with a ListView_GetVisibleItemsIndexes method, or a ListView.VisibleListItems collection.

Also, how about having a method added to the ImageManager control:
ImageManager.LoadFileIcon(filename as string) - get's the system icon used for specified file.

Finally, maybe 'FileListView' and 'FolderBrowser' controls would be a good addition to the SuitePro bundle? FileListView would need a Filter property to only show matching files, and an option to show 'preview' images for png files etc.

Cheers

Ian

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ijwelch Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 20 June 2006 Status: Offline Points: 262	Post Options Post Reply Quote ijwelch Report Post Thanks(0) Quote Reply Topic: ListView - some missing events/properties Posted: 16 November 2007 at 3:10am
	Hi Codejock, In trying to implement a 'file list' type control using the Codejock ListView I came across a few missing features. Basically, loading the icons for each item is time consuming if there are a large number of files. The correct way to go about it is to load icons for each item as needed and then cache. This would be fine BUT: 1. There's no ListView_Scroll event and so no way to detect when items icons might need loading. 2. There's no ListViewItem.IsVisible property (I see the ListView.GetFirstVisible method, but then I need to check following items are visible or not) I'm not even sure if the above 'missing' features would accurately solve the problem anyway (sort order would affect things also I imagine). Maybe this could be done with a ListView_GetVisibleItemsIndexes method, or a ListView.VisibleListItems collection. Also, how about having a method added to the ImageManager control: ImageManager.LoadFileIcon(filename as string) - get's the system icon used for specified file. Finally, maybe 'FileListView' and 'FolderBrowser' controls would be a good addition to the SuitePro bundle? FileListView would need a Filter property to only show matching files, and an option to show 'preview' images for png files etc. Cheers Ian