Synchronize the scroll of two data table contents together and ChangeListener

Ignition
#1

Hi all,

I have two tables which i would like to scroll synchronously.
I am using pturmel’s example (Freeze table column), and everything is working fine.
But I would like add some point to stop that ChangeListener and break synchronous scrolling two tables. Not sure how to do this. There is removeChangeListener() but i did not figure out how to use it.
Also, where can be found some details regarding viewport, especially for Table Component (table.viewport)?

Any help is appreciated, thanks!

#2

You have to pass the listener you want to remove to the removeChangeListener() method. Which means you need to save it somewhere persistent. A client property of the component is probably the best place.

#3

Thank you ptumel.

I tried client property. I added myScrollEvent to Button_1, and save it as myClientProperty_1, and then use another Button_2, get myClentProperty_1, print myScrollProperty_1 (<function myScrollEvent at 0x2>), but when i try to remove change listener “tblT22.viewport.removeChangeListener(myScrollEvent)”, nothing happens. Change listener is still active and both table are still scroll synchronously.
What i am doing wrong?

#4

Ah, I think you’ll actually have to subclass the ChangeListener interface. I think that happens under the hood if you just add a callable, so the callable isn’t really the ChangeListener. If you subclass it, jython shouldn’t transform it automagically.

#5

Thank you ptumel.
It works now. (had to search a little bit about sub-interfaces of EventListener)

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#6

Care to share the example for the community…?

#7

hi zxcslo, here is what is use for testing synchronize the scroll of two tables:

tblT22 = event.source.parent.getComponent(‘Table 22’)
tblT12 = event.source.parent.getComponent(‘Table 12’)

class myListener(ChangeListener):
def stateChange(self, e):
scrollBarMain = tblT22.getHorizontalScrollBar()
scrollBarTop = tblT12.getHorizontalScrollBar()
scrollBarTop.setValue(scrollBarMain.getValue())

#to add ChangeListener
tblT22.viewport.addChangeListener(myListener())

#to remove ChangeListener
mls = tblT22.viewport.getChangeListeners()
for m in mls:
tblT22.viewport.removeChangeListener(m)

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