Eclipse Community Forums: NatTable » ColumnOverrideAccumulator to ColumnGroupHeaderLayer or ColumnGroupGroupHeaderLayer

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ColumnOverrideAccumulator to ColumnGroupHeaderLayer or ColumnGroupGroupHeaderLayer [message #1705542]

Mon, 17 August 2015 12:46

Yeshaswini HS

Messages: 7
Registered: October 2014

Junior Member

I am using 2 level Column Grouping using ColumnGroupGroupHeaderLayer and ColumnGroupHeaderLayer

In colummnGroupHeaderLayer.addColumnIndexesTo Group("groupName1", 1,2,3);
In the above line instead of hardcoding given some unique identifier for groupName1 and overriden the method getDataValueByPosition()in columnGroupHeaderLayer to iterate the list based on columnPosition and return value.(this is the value of the actual groupName1).

What is happening is

Since over ViewPort layer our columnGroupLayer is used, everytime i scroll columnPosition changes so everytime columnGroupHeaderLayer . getDataValueByPosition() is called , so as i scroll column group Header layer cell value is changing.

To Solve this, i used

i) i override the method getConfigLabelsByPositionin ColumnGroupHeaderLayer
LabelStack result = super.getConfigLabelsByPosition(columnPosition, rowPosition);
int columnIndex = getColumnIndexByPosition(columnPosition);
int rowIndex = getRowIndexByPosition(rowPosition);

if (rowIndex == 0 && this.isColumnInGroup(columnIndex)) {
result.add("LABEL");
}

Also i did

IConfigLabelAccumulator cellLabelAccumulator = new IConfigLabelAccumulator() {

@Override
public void accumulateConfigLabels(LabelStack configLabels,int columnPosition, int rowPosition) {
int columnIndex = columnGroupHeaderLayer.getColumnIndexByPosition(columnPosition);
int rowIndex = columnGroupHeaderLayer.getRowIndexByPosition(rowPosition);

if (rowPosition==0) {

configLabels.addLabel("COLUMN_GROUP_HEADER");
}

}

}
};

Both dint work

How to solve this issue?

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Re: ColumnOverrideAccumulator to ColumnGroupHeaderLayer or ColumnGroupGroupHeaderLayer [message #1705561 is a reply to message #1705542]

Mon, 17 August 2015 13:46

Alpha Foxtrott

Messages: 8
Registered: July 2015

Junior Member

Hi,

I don't understand what you want to achieve.

You got a 2 level column grouping, and you have problems with the viewport layer if you scroll from left to right or vice versa, right?

As often pointed out in this forum, such problems mostly come from overriding methods instead of creating a special configuration to get the behaviour you want.

Please provide more infomation, so we can help you. Try to tell us your goal, what you want to achieve. Maybe there is a more simple way to do this.

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Re: ColumnOverrideAccumulator to ColumnGroupHeaderLayer or ColumnGroupGroupHeaderLayer [message #1706141 is a reply to message #1705561]

Mon, 24 August 2015 07:23

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

It seems you don't understand the basic mechanics of NatTable. And I don't understand why people are overriding internal methods when they haven't understood whats happening internally.

First, from what I can see from your post I assume you don't know about the index-position transformation. Therefore the values are changing on scrolling.
Second, why should setting a label help regarding the cell content. One of the main concepts is to separate content and rendering. Therefore your solution to solve your self-produced issue is simply wrong.

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