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Issue with scroll bar for NatTable freeze command [message #1495631]

Tue, 02 December 2014 11:25

Amruta Sardeshmukh

Messages: 25
Registered: September 2014

Junior Member

Basically I have implemened NatTable on custom panel,the custom panel has been implemented through eclipse plugins.There is FreezeColumn command implemented for freezing the columns.My NatTable has more than 37 columns.The Freeze works well till column 12 but after that if I try to apply freeze command to any of the columns later than that, then the viewport layer suddenly jumps to inital columns of NatTable and the horizontal scroll disappears.

final int colIndex = getColumnIndexByPosition (obj.getColumnPosition());

natTable.doCommand(new FreezeColumnCommand(natTable.getLayer(), colIndex));

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Re: Issue with scroll bar for NatTable freeze command [message #1495657 is a reply to message #1495631]

Tue, 02 December 2014 11:46

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

Possibly related to the ViewportLayer since you are firing a command down the layer stack for a index that might not be visible. Maybe it helps to programmatically scroll prior freezing.

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Re: Issue with scroll bar for NatTable [message #1495783 is a reply to message #1495631]

Tue, 02 December 2014 14:06

ambuj bhargava

Messages: 19
Registered: July 2014

Junior Member

Hi Dirk

I have implemented the NatTable and it has 15 columns. The issue I am facing is when user clicks on the cell of the Nat Table. The horizontal scroll automatically shifts to extreme left which is quite disturbing.

How to avoid this automatic shifting of the scroll bar.

Regards
Ambuj

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Re: Issue with scroll bar for NatTable [message #1495826 is a reply to message #1495783]

Tue, 02 December 2014 14:53

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

I don't understand what you mean

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Re: Issue with scroll bar for NatTable [message #1495935 is a reply to message #1495826]

Tue, 02 December 2014 16:44

Amruta Sardeshmukh

Messages: 25
Registered: September 2014

Junior Member

Can you suggest some NATTabel example which I can refer to for programatic scroll

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Re: Issue with scroll bar for NatTable [message #1495944 is a reply to message #1495935]

Tue, 02 December 2014 16:53

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

No, there is no such example. But Google helps on this: http://lmgtfy.com/?q=nattable+scroll+programmatically

https://www.eclipse.org/forums/index.php/t/628001/
http://stackoverflow.com/questions/17593049/scroll-nattable-programmatically

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Re: Issue with scroll bar for NatTable [message #1495972 is a reply to message #1495935]

Tue, 02 December 2014 17:21

Amruta Sardeshmukh

Messages: 25
Registered: September 2014

Junior Member

While debugging I have observed in the FreezeHelper.freeze

IUniqueIndexLayer scrollableLayer = viewportLayer.getScrollableLayer();
int originX = bottomRightPosition.columnPosition == scrollableLayer.getColumnCount() - 1 ? scrollableLayer.getWidth() : scrollableLayer.getStartXOfColumnPosition(bottomRightPosition.columnPosition + 1);
int originY = bottomRightPosition.rowPosition == scrollableLayer.getRowCount() - 1 ? scrollableLayer.getHeight() : scrollableLayer.getStartYOfRowPosition(bottomRightPosition.rowPosition + 1);

For problematic condition following are the values for
originX = 1147
originY =0

Could this be the issue.Is there any way where I can set the scrollableLayer to correct position.

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Re: Issue with scroll bar for NatTable [message #1495977 is a reply to message #1495972]

Tue, 02 December 2014 17:26

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

What is correct? AFAIK this is intended so if a users performs a freeze operation in scrolled state the NatTable shows only the last column(s) of the frozen region. That is how freeze should work. Otherwise what should happen if the freeze region is bigger than the available space to render? The freeze region is not intended to scroll as it should stay per definition.

Of course you can hack by setting the viewportlayer origin manually for programmatic scrolling. For this see the links I posted above.

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Re: Issue with scroll bar for NatTable [message #1499704 is a reply to message #1495977]

Fri, 05 December 2014 10:47

Amruta Sardeshmukh

Messages: 25
Registered: September 2014

Junior Member

I have been able to avoid the scroll bar disappear by adjusting setTopLeftPosition in freeze layer:

freezeLayer.setTopLeftPosition(topLeftPosition.columnPosition, topLeftPosition.rowPosition);
freezeLayer.setBottomRightPosition(bottomRightPosition.columnPosition, bottomRightPosition.rowPosition);

however I would be intrested to reset the vertical scroll bar to extreme left i.e.

I have tried to acheive it with
viewPortLayer.setOriginX and setOriginY but I am not able to exactly identify the X coordinate to reset the scroll bar.

Could you please point me to the correct method to invoke.

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Re: Issue with scroll bar for NatTable [message #1500111 is a reply to message #1499704]

Fri, 05 December 2014 17:54

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

I still don't understand what you are doing and what your issue is. IMHO you are trying to perform an action that can not be performed because it brings NatTable in an inconsistent state. Your "workaround" to set the freeze states afterwards again to some value you think that is correct.

Saying that I can't tell you what you should do or which method you should invoke since IMHO you are doing things you shouldn't do, and I don't know how to doing things wrong.

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