TreeView slowed by custom ButtonImageList/CheckImageList

TreeView slowed by custom ButtonImageList/CheckImageList

Posted by: kbj on 8 May 2018, 12:51 pm EST

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  kbj

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  Posted 8 May 2018, 12:51 pm EST

  I have a treeview that uses custom ButtonImageList/CheckImageList (to display properly sized expand/contract and checkbox in a high dpi environment) that redraws much slower than the same treeview without the custom imagelists.
  
  I have to believe the bottleneck is in using a listview to retrieve the images rather than simply exposing an image property for each one of the expand and checked states. The treeview uses a custom CustomContentPresenter which draws images (not from a listview VERY quickly).
  
  Is there anyway to set the default expand/contract and checked images directly?
  
  As an aside, directly setting images in a ribbon menu is significantly faster than linking the control to a imageList. It must be either some slowdown in the way you retrieve the images from the imagelist, or a basic weakness in the imagelist class itself.

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  kbj

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  Posted 8 May 2018, 12:53 pm EST

  er above I meant “using an imageList to retrieve the images” not a listview

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  Ruchir.Agarwal

  

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  Posted 9 May 2018, 9:26 am EST

  Hello,

  If you wish to modify checked/expand node image using a single property, then the option available is to use CheckBoxStyle/ExpandButtonStyle properties. However, they consist of only 3 options to select from System/VS15/Windows10, giving limited flexibility.
  
  Moreover, did you try accessing the images from resources? That might result in better performance.
  
  Also, could you please share a video/application demonstrating how worse the treeview is performing as compared to without imagelist.

  Thanks,