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Normal Topic Multi-select using click and drag (Read 2330 times)
David Long
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Multi-select using click and drag
Jun 23rd, 2022 at 2:56pm
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I can select multiple boxes in my chart using CTRL+click on each box - this gives me pic1. I can also draw a selection rectangle that stays inside the boundaries of the boxes and this seems to work although I think it's an undocumented feature (pic2). What users are used to is to draw a selection rectangle around the boxes to be selected (pic3). This does not seem to work. Is there a way of getting this to work also?

Thanks in advance.
DavidL
  
Pic1.PNG ( 2 KB | 84 Downloads )
Pic1.PNG
pic2.PNG ( 2 KB | 80 Downloads )
pic2.PNG
pic3.PNG ( 3 KB | 88 Downloads )
pic3.PNG
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Slavcho
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Re: Multi-select using click and drag
Reply #1 - Jun 23rd, 2022 at 4:48pm
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It should also work when drawing the selection lasso around nodes. Check if you are not preventing that from Diagram.NodeSelecting event handler.

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Slavcho
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David Long
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Re: Multi-select using click and drag
Reply #2 - Jun 24th, 2022 at 3:26pm
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No, I'm not actually handling the NodeSelecting event.
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Slavcho
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Re: Multi-select using click and drag
Reply #3 - Jun 27th, 2022 at 9:26am
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Also check if not clearing selection from SelectionChanged event handler.

That works in the control's demo and sample projects otherwise. You could save empty diagram XML from one of them and from your application, and compare the files (e.g. using SDK's windiff tool) to see if differing property values aren't affecting selection behavior.

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Slavcho
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David Long
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Re: Multi-select using click and drag
Reply #4 - Jun 27th, 2022 at 3:30pm
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I was actually clearing the selection in the mouse click event handler for some reason now lost in time. Problem now fixed. Thanks for your help.

DavidL
  
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