Listbox Multiselect on touchscreen

General
1

The listbox control has a Selectiontype property which can be set to Mutiple. This works fine but you need the Ctrl button to select the second row. On a touchscreen this is going to be a thing. Does anybody know the trick how to do this ?

2

@Joost Rongen — The SelectionType does not change much in the ListBox’s behavior because YOU are responsible for creating/using the list of selected items using “selected( row )”.

About the GUI, on my iPad, I usually need to do some action before I can select multiple items (like clicking on the Modify button). Then every click is interpreted as either selecting or deselecting a row.

3

Of course, I did so. But the trouble is, when you tap on a row (touchscreen) , the listbox first deselects the previously selected row(s) and selects the one you tapped on. The Change event fires afterwards. In the Change event you can re-select all other rows via code again, but you will see this proces as a lumpy behavior.
Using the WebListbox you can simply use the CellClick event which works fine for multirow selection on a touchscreen.
But, I still haven’t found a good looking solution for the Listbox control on desktop.

4

in mousedown get the row (fromXY) that was tapped, then you should be able to set the old and new row trough code
Se the return value appropriately

5 
dim p1(-1) as integer //the listitems to select
dim p2 as integer = 1 //are we selecting multiple records right now?

if p2=1 then 
  p1.Append(me.ListIndex) //add the current item to the array of rows to be selected
  if p1.Ubound=0 then //if there are no other rows to be sel. then this must be number 1
    //do nothing...  we have our first selection
  else
    for i as integer = 0 to p1.Ubound //from the first item to select to the last item
      lb.Selected(p1(i))=true //select that row...
    next //if nothing else move along, otherwise, go through it again 
  end
end
6

there. lol

7

Hi Robert, this is was my first thought was so I implemented it. Looks very lumpy to the user. We select rows by code which got deselected by the click event, so you will notice the re-selection of the rows. Functional it works fine, the experience is for the user is just not so professional.

8

what kind of touchscreen is this you are using? Raspberry pi?
If so you could map keys to multitouch.

9

The absence of right-click is the root of most of my gripes about touchscreen/ ipad use.
Its such a useful thing to be able to get options.

10

Just a presentation screen on the wall, OS = Win10

As said, functional it’s working ok. The look and feel is anything but perfect.
I am afraid the enduser has to accept as long as I use the xojo listbox here.

11

[quote=469202:@Joost Rongen]Just a presentation screen on the wall, OS = Win10

As said, functional it’s working ok. The look and feel is anything but perfect.
I am afraid the enduser has to accept as long as I use the xojo listbox here.[/quote]

I think there is a way to do this, i may have to look into it.
No time for coding today.

12

Thanks Derk.

Joh ? No worries.

13

And you cannot ask Windows 10 to display the keyboard on screen ?

14

No - since the app is actually a dashboard.

15

Sorry.

16

[quote=469205:@Joost Rongen]Thanks Derk.

Joh ? No worries.[/quote]

No coding but here’s a probability:
In this event:
http://documentation.xojo.com/api/deprecated/listbox.html#listbox-cellclick

Set the selection of the row from the event and return true.
By returning true the listbox should keep it’s current selection as the docs say.

Me.Selected(row) = True

Return True

That should do it

17

You could add an extra column, and format the new cell as a checkbox.
That allows the user to ‘check’ the rows they want to operate upon.

18

[quote=469215:@Derk Jochems]No coding but here’s a probability:
In this event:
http://documentation.xojo.com/api/deprecated/listbox.html#listbox-cellclick

Set the selection of the row from the event and return true.
By returning true the listbox should keep it’s current selection as the docs say.

Me.Selected(row) = True

Return True

That should do it[/quote]

@Joost Rongen did you try this ?

19

Yes I did, and would expect this to be working but it doesn’t work out as expected.
If you try to select a row in between two selected rows, it selects a complete wrong row and if click on a selected row, it get’s the wrong row too. Did not have the time to do further research on this behavior related to the expected behavior.
For now, I give up with this, too time consuming…Hope the user will accept the functional working multiselection listbox I delivered here.

20

Hm. That’s probably a bug. Let’s see when there’s time to test