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POHow to implement a custom ColumnSorter with ScrollTable (GWT-incubator)
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  1. POHow to implement a custom ColumnSorter with ScrollTable (GWT-incubator)
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    copied!<p>I've implemented my custom column sorter which is used to sort the elements in my table.</p> <pre> class FileColumnSorter extends SortableGrid.ColumnSorter { @Override public void onSortColumn(SortableGrid sortableGrid, TableModelHelper.ColumnSortList columnSortList, SortableGrid.ColumnSorterCallback columnSorterCallback) .... } </pre> <p>When I initialize the FixedWidthGrid I do the following:</p> <pre> FixedWidthGrid dataTable = new FixedWidthGrid(rows, cols); dataTable.setSelectionPolicy(SelectionGrid.SelectionPolicy.ONE_ROW); dataTable.setColumnSorter(new FileColumnSorter()); </pre> <p>The scrolltable is initialized the following way:</p> <pre> FixedWidthFlexTable headerTable = createHeaderTable(); // Calling the lines described above FixedWidthGrid fileListGrid = createDataTable (currentDescriptorList.size(), 6); // Combine the components into a ScrollTable scrollTable = new ScrollTable(fileListGrid, headerTable); scrollTable.setSortPolicy(AbstractScrollTable.SortPolicy.SINGLE_CELL); scrollTable.setColumnSortable(0, false); scrollTable.setColumnSortable(1, true); scrollTable.setColumnSortable(2, true); scrollTable.setColumnSortable(3, true); scrollTable.setColumnSortable(4, true); scrollTable.setColumnSortable(5, false); </pre> <p>When I run the application, I get the built in sorting instead of my custom sorting. I've also tried to do the following:</p> <pre> ColumnSorter sorter = new FileColumnSorter(); FixedWidthGrid dataTable = new FixedWidthGrid(rows, cols) { @Override public ColumnSorter getColumnSorter() { return sorter; } }; </pre> <p>To ensure that my sorter get used, but I still get the same experience. </p> <p><strong>Update: Added the FileColumnSorter</strong></p> <pre><code>class FileColumnSorter extends SortableGrid.ColumnSorter { @Override public void onSortColumn(SortableGrid sortableGrid, TableModelHelper.ColumnSortList columnSortList, SortableGrid.ColumnSorterCallback columnSorterCallback) { final int column = columnSortList.getPrimaryColumn(); final Integer[] originalOrder = new Integer[sortableGrid.getRowCount()]; for (int i = 0; i &lt; originalOrder.length; i++) { originalOrder[i] = i; } Arrays.sort(originalOrder, new Comparator&lt;Integer&gt;() { public int compare(Integer first, Integer second) { Descriptor firstDesc = share.getCurrentDescriptors().get(first); Descriptor secondDesc = share.getCurrentDescriptors().get(second); if (firstDesc.getType().equals(secondDesc.getType())) { switch (column) { case 0: return firstDesc.compareTo(secondDesc); case 1: return firstDesc.getName().compareTo(secondDesc.getName()); case 2: return ((Long) firstDesc.getSize()).compareTo(secondDesc.getSize()); case 3: return firstDesc.getCreated().compareTo(secondDesc.getCreated()); case 4: return firstDesc.getModified().compareTo(secondDesc.getModified()); default: return firstDesc.compareTo(secondDesc); } } else { return firstDesc.getType() == Descriptor.FileItemType.FOLDER ? 1 : -1; } } }); int[] resultOrder = new int[originalOrder.length]; for (int i = 0; i &lt; originalOrder.length; i++) { if (columnSortList.isPrimaryAscending()) { resultOrder[i] = originalOrder[i]; } else { resultOrder[resultOrder.length - i - 1] = originalOrder[i]; } } columnSorterCallback.onSortingComplete(resultOrder); } } </code></pre>
 

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