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Dynamically change the parent without disposing the children [message #888724]

Mon, 18 June 2012 14:46

nani Missing name

Messages: 10
Registered: May 2011

Junior Member

Hi,

I got a situation where i need to create Labels[children] on Composite[parent].i am creating using the following code

for(wordnum = 0;wordnum<256;wordnum++)
{
word[wordnum] = new Label(composite, SWT.BORDER);
word[wordnum].setToolTipText(Integer.valueOf(wordnum+1).toString());
word[wordnum].setData(Integer.valueOf(wordnum+1).toString());
word[wordnum].setText(Integer.valueOf(wordnum+1).toString());
}

the layout for this composite is GridLayout.

when i select a value from combo box which is present in my UI.the labels should be ordered differently

Example: If the UI before selecting the option in combo box is

1 65 129 193 17 81 145 209 33 97 161 225 49 113 177 241
2 66 130 194 18 82 146 210 34 98 162 226 50 114 178 242

After selecting the value from combo box the UI should be

1 33 65 97 129 161 193 225 17 49 81 113 145 177 209 241
2 34 66 98 130 162 194 226 18 50 82 114 146 178 210 242

I am using the GridLayout ,here the problem is when i change the columns the values are displaying in a wrong way like this.

1 65 129 193 2 66 130 194 17 81 145 209 18 82 146 210
Please suggest me some solution.

Thanks in advance.

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Re: Dynamically change the parent without disposing the children [message #889485 is a reply to message #888724]

Tue, 19 June 2012 09:24

Jan Krakora

Messages: 477
Registered: December 2009
Location: Prague

Senior Member

Hi, why you can't recreate all those Labels whenever the selection in the combo changes?

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Re: Dynamically change the parent without disposing the children [message #889799 is a reply to message #889485]

Tue, 19 June 2012 16:56

Grant Gayed

Messages: 2150
Registered: July 2009

Senior Member

If your case is really just a bunch of labels then it's most efficient
to setText() on each of them with their new content and then
parent.layout(true).

To re-arrange controls that have a common parent use Control.moveAbove()
repeatedly, and when you're done parent.layout(true).

Grant

On 6/19/2012 5:24 AM, Jan Krakora wrote:
> Hi, why you can't recreate all those Labels whenever the selection in
> the combo changes?

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Re: Dynamically change the parent without disposing the children [message #890094 is a reply to message #889799]

Thu, 21 June 2012 05:23

nani Missing name

Messages: 10
Registered: May 2011

Junior Member

@jan Krakora ,
I am assigning TONS of data to each label before positioning , if i recreate the labels i have to reload the data and set that again,which might decrease my tool performance.

Thanks for the reply..

@Grant Gayed ,

I am iterating and setting the bounds for each label which solved my problem,but i am unable to stop the scroll bar,because i am using a composite over a scrolled composite and i am setting the size of composite dynamically.how can i restrict the scroll bar when the user can see all labels.

Thanks for the reply...

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