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flc.net
Joined: 21 Jun 2005
Posts: 89
Location: Switzerland
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 Posted: Mon Aug 29, 2005 7:28 am Post subject: SelectedRow/SelectedItem don' t invoke SelectionChanging |
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Hello Support
I think this is a Bug: Selecting a Row/Item with the Methods SelectedRow/SelectedItem only invokes the Event SelectionChanged but not the Event SelectionChanging.
Best Regards
Giuseppe |
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Infralution
Joined: 28 Feb 2005
Posts: 5027
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| Posted: Mon Aug 29, 2005 9:51 am Post subject: |
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I'm not sure that this really is a bug. The selection changing event is fired by VirtualTree when the user interactively attempts to make changes that will affect the selection of the tree. It is not fired in response to a change in the SelectedRows collection (as SelectionChanged is). It's intent was to allow you to prevent the user selecting something that you don't want allow them to - or to warn them if they are about to do something that may take some time (eg selecting 1 million rows). If you are setting the selection programatically then presumably you know the selection rules and so it shouldn't be an issue.
Anyway let us know what you thoughts are and why you think it should fire SelectionChanging in this case.
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Infralution Support |
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flc.net
Joined: 21 Jun 2005
Posts: 89
Location: Switzerland
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| Posted: Mon Aug 29, 2005 10:42 am Post subject: |
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| Infralution wrote: | | Anyway let us know what you thoughts are and why you think it should fire SelectionChanging in this case. |
I thought it would be the same behaviour like Microsoft implementation: e.g. If you call myForm.Close() both Closing and Closed are invoked.
I have implemented an generic "AutoUpdate". If a User edits the Data in Row 0 and then jumps to Row 1 data from Row 0 will be updated on the Database.
I use the SelectionChanged Event to know when the User leaves the Row and the SelectionChanging Event to know which Row they have edited (through SelectionChangingEventArgs).
With the CheckBox as a PrefixColumn, I set the SelectedRow via Code when a User checks the Box.... and because the SelectionChanging Event is not fired i don't know which row was selected before.
I can implement my behaviour in another way so it's OK when SelectedRow/SelectedItem does not invoke the Changing event.
Thanks and Best Regards
Giuseppe |
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Infralution
Joined: 28 Feb 2005
Posts: 5027
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| Posted: Mon Aug 29, 2005 11:10 am Post subject: |
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Actually I find the form.Closing behaviour a bit irritating. If you want to prevent the user closing the form using the form close cross you handle the Closing event and set the cancel flag - but then you get the event firing when you programmatically close the form - so you have to set some member variable so that in the Closing event you know that you really want to close this time. I'm fairly sure this was different in VB6.
Anyway we will put some more thought into the issue. If you want to auto update the database why not just do it from the SetCellValue event (ie whenever a cell value is changed)? If you use the Validated event as CellEditor UpdateValueEvent (which is the default) then typically this is only fired as the user changes selection anyway.
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