Re: How to fix the Column Ordering issue when Insert and Remove columns in GWT?

Sure, the index to insert at is the "original" minus the number of hidden columns before it; or put differently, the number of visible columns before it. In any case, it means tracking the visible state of your columns.

You could use an array of booleans representing the visible state of your columns (by their "original" index), and therefore count the number of visible/invisible columns.

Or each column could know its predecessor, in a linked list fashion, and its visible state, so you could ask the column to compute its "current index" based on its predecessor's index and its visible state (recursively).

On Friday, February 7, 2014 3:55:18 PM UTC+1, Tom wrote:

I have a cellTable that has many columns like the followings:

OrderID - OrderDate - OrderTime - Name .....  1 - 2012-01-05 - 11:12:12 - Tom......   

Each column will have a checkBox for Hide/Unhide column:

[x] orderID (CheckBox)  [x] orderDate (CheckBox)  [x] orderTime (CheckBox)  ......  

Requirement: I want that when users uncheck the CheckBox the corresponding column will disappear & when they check the CheckBox, the column will appear in the CORRECT ORDER as at the beginning. This is the code:

public void insertColumn(int beforeIndex, TextColumn<String[]> textColumn, String columnName){      if(getView().getOrderListCellTable().getColumnIndex(textColumn)==-1){          getView().getOrderListCellTable().insertColumn(beforeIndex,textColumn, columnName);          textColumn.setSortable(true);      }  }  public void removeColumn(TextColumn<String[]> textColumn){      int index= getView().getOrderListCellTable().getColumnIndex(textColumn);        if(index!=-1){          getView().getOrderListCellTable().removeColumn(index);      }  }  

However, I got this issue, when I hide / unhinde just 1 column then the order is OK, ex, hide orderDate column then the table will be like this:

OrderID - OrderTime - Name .....  1 - 11:12:12 - Tom......   

And ofcourse, when unhiding orderDate then it will go back to the beginning correctly.

Code to insert/remove orderDate

    getView().getOrderDateCheckBox().addClickHandler(new ClickHandler(){            @Override          public void onClick(ClickEvent event)       {                 if(getView().getOrderDateCheckBox().getValue()){                        insertColumn(1, orderDateColumn,"Order Date");              }              else{                  removeColumn(orderDateColumn);              }          }        });  

But if I hide both orderID & OrderDate & then unhide orderDate then it will be like this:

OrderTime - OrderDate - Name .....  11:12:12 - 2012-01-05 - Tom......   

This is not right cos he orderDate should be stand before orderTime. This cos I insertColumn(1, orderDateColumn,"Order Date"); at position 1 (before index).

Can you figure out a logic to fix this issue?

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