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.NET Forum / Languages / C# / March 2008ListView Grid Distortion
My ListView components seem to produce distortion when they are scrolled in Details view; it looks almost like the text has a "strike-through" attribute applied to it. Does anyone know of a fix for this? If not, is there an alternative component available (that behaves like a ListView) ? TIA L PS: this is in VS 2005, SP1 ... I have not checked yet whether vs2008 behaves differently I vaguely remember working around a problem similar to that, by adding a scroll handler and calling the Invalidate method (to force a refresh). > My ListView components seem to produce distortion when they are scrolled > in Details view; it looks almost like the text has a "strike-through" [quoted text clipped - 9 lines] > PS: this is in VS 2005, SP1 ... I have not checked yet whether vs2008 > behaves differently >I vaguely remember working around a problem similar to that, by adding a >scroll handler and calling the Invalidate method (to force a refresh). what event did you handle ... on what object? this sounds like it makes sense but I have no handles to grab here ... can you say a little bit more about what you did? thanks .... Liz >> My ListView components seem to produce distortion when they are scrolled >> in Details view; it looks almost like the text has a "strike-through" [quoted text clipped - 9 lines] >> PS: this is in VS 2005, SP1 ... I have not checked yet whether vs2008 >> behaves differently >>I vaguely remember working around a problem similar to that, by adding a >>scroll handler and calling the Invalidate method (to force a refresh). > > what event did you handle ... on what object? The Scroll event on a DataGridView. It looks like I didn't have that problem with a ListView. I think you can catch the Scroll event on a ListView too though. >>>I vaguely remember working around a problem similar to that, by adding a >>>scroll handler and calling the Invalidate method (to force a refresh). [quoted text clipped - 4 lines] > problem with a ListView. I think you can catch the Scroll event on a > ListView too though. no ... there's a scroll event in the docs for DataGridView but none for ListView; am I missing something? L >>>> I vaguely remember working around a problem similar to that, by adding >>>> a scroll handler and calling the Invalidate method (to force a [quoted text clipped - 8 lines] > no ... there's a scroll event in the docs for DataGridView but none for > ListView; am I missing something? You're right, I just checked, and you and I are both missing an event that just seems too sensible. I wonder why someone thought programmers wouldn't need a Scroll event on a ListView. The form itself has a Scroll event. If you handle that one and check to see if the sender (of type Object) is your ListView, does that work? In my experience, these types of artifacts are caused by crappy graphics drivers. Do you experience the problem on different machines or only on a specific one? What graphics card are you using? /claes > My ListView components seem to produce distortion when they are scrolled > in Details view; it looks almost like the text has a "strike-through" [quoted text clipped - 9 lines] > PS: this is in VS 2005, SP1 ... I have not checked yet whether vs2008 > behaves differently > In my experience, these types of artifacts are caused by crappy graphics > drivers. Do you experience the problem on different machines or only on a > specific one? What graphics card are you using? > > /claes it's not just my machines, Claes ... (NVIDIA 7950 on the primary dev machine) ... I hope you are not right about this because I really don't think you can tell businesses they have to buy 1400 high-end gamer-class video boards just to get rid of some distortion in a simple ListView control; this is not (or shouldn't be) a complex, demanding video requirement .. it's a tough sell when every other application they have works just fine. My own question would be, "well how come my really complex Excel sheets render without any distortion?" >> My ListView components seem to produce distortion when they are scrolled >> in Details view; it looks almost like the text has a "strike-through" [quoted text clipped - 9 lines] >> PS: this is in VS 2005, SP1 ... I have not checked yet whether vs2008 >> behaves differently >> In my experience, these types of artifacts are caused by crappy graphics >> drivers. Do you experience the problem on different machines or only on a [quoted text clipped - 10 lines] > works just fine. My own question would be, "well how come my really > complex Excel sheets render without any distortion?" I never said anything about the grahics adapter, only the driver. If we're talking 1400 machines then I'm sure they have the means to provide software updates to those machines. Any adapter that's less than 5 years old should be able to show a listview without problems. An nVidia 7950 should be just fine. However, it sounds like you're experiencing this with different adapters so it's unlikely that it's a driver problem. FWIW, I have around 500 machines using a Matrox card with buggy drivers that causes artifacts with a listview. I can't update though because the new drivers are worse! I managed to work around the problem by lowering the hardware acceleration a notch. Could be worth trying in your case. /claes > FWIW, I have around 500 machines using a Matrox card with buggy drivers > that causes artifacts with a listview. I can't update though because the > new drivers are worse! I managed to work around the problem by lowering > the hardware acceleration a notch. Could be worth trying in your case. thanks; this sounded promising but didn't pan out .. it's a strange problem .. the *only* time I see distortion is when I click on the scoll bar anywhere off of the slider ... anything else: arrow up, down, pgUp, pgDn, using the slider to scroll, right-clicking on the scroll bar and selecting "Scroll Here" ... all work without problem L
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