GWT CellTree inside a DataGrid does not react to mouse-clicks - gwt

Question

I have put a GWT-CellTree in a DataGrid. It works except for one thing: When clicking on the tree-expand-icon, nothing happens. I have tried to minimize the
code needed to reproduce the problem...
How can this be fixed ?
best regards, Magnus
package com.raybased.gwt.configtool.client.grid;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.cellview.client.DataGrid;
import com.google.gwt.user.client.ui.RootLayoutPanel;
import com.google.gwt.user.client.ui.SimpleLayoutPanel;
public class HelloWorld implements EntryPoint {
public void onModuleLoad() {
DataGrid grid= (DataGrid) new NodesGrid().getTable();
grid.setWidth("100%");
SimpleLayoutPanel slp = new SimpleLayoutPanel();
slp.add(grid);
RootLayoutPanel.get().add(slp);
}
}
package com.raybased.gwt.configtool.client.grid;
import com.google.gwt.cell.client.ClickableTextCell;
import com.google.gwt.cell.client.FieldUpdater;
import com.google.gwt.dom.client.Style;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.text.shared.AbstractSafeHtmlRenderer;
import com.google.gwt.text.shared.SafeHtmlRenderer;
import com.google.gwt.user.cellview.client.*;
import com.google.gwt.user.cellview.client.HasKeyboardSelectionPolicy.KeyboardSelectionPolicy;
import com.google.gwt.view.client.ListDataProvider;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.function.Function;
public class NodesGrid {
private AbstractCellTable<Node> table = new DataGrid<>();
private Column nameColumn;
private Column<Node, String> showBlocksColumn;
private final Set<Integer> showBlocks = new HashSet<>();
public Column getNameColumn() {
return nameColumn;
}
public AbstractCellTable<Node> getTable() {
return table;
}
public NodesGrid() {
table.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.ENABLED);
table.setWidth("100%");
CustomCellTableBuilder c = new CustomCellTableBuilder(this, table);
table.setTableBuilder(c);
Node nodes = new Node();
nodes.setName("hello");
nodes.setId(123);
Node n2 = new Node();
n2.setName("testing");
nodes.getBlocks().add(n2);
ListDataProvider<Node> dataProvider = new ListDataProvider<>();
dataProvider.addDataDisplay(table);
List<Node> list = dataProvider.getList();
list.add(nodes);
addShowBlocks();
nameColumn = getSorter(list, "Name", Comparator.comparing(Node::getName), Node::getName);
}
private Column getSorter(List<Node> list,
String name,
Comparator<Node> cmp,
Function<Node, String> supplier) {
TextColumn<Node> column = new TextColumn<Node>() {
#Override
public String getValue(Node object) {
return supplier.apply(object);
}
};
table.addColumn(column, name);
column.setSortable(true);
ColumnSortEvent.ListHandler<Node> columnSortHandler = new ColumnSortEvent.ListHandler<>(list);
columnSortHandler.setComparator(column, cmp);
table.addColumnSortHandler(columnSortHandler);
table.getColumnSortList().push(column);
return column;
}
public Column<Node, String> getShowBlocksColumn() {
return showBlocksColumn;
}
public Set<Integer> getShowBlocks() {
return showBlocks;
}
void addShowBlocks() {
SafeHtmlRenderer<String> anchorRenderer = new AbstractSafeHtmlRenderer<String>() {
#Override
public SafeHtml render(String object) {
SafeHtmlBuilder sb = new SafeHtmlBuilder();
sb.appendHtmlConstant("(<a href=\"javascript:;\">").appendEscaped(object)
.appendHtmlConstant("</a>)");
return sb.toSafeHtml();
}
};
showBlocksColumn = new Column<Node, String>(new ClickableTextCell(anchorRenderer)) {
#Override
public String getValue(Node node) {
if (showBlocks.contains(node.getId())) {
return "hide blocks";
} else {
return "show blocks";
}
}
};
showBlocksColumn.setFieldUpdater(new FieldUpdater<Node, String>() {
#Override
public void update(int index, Node node, String value) {
if (showBlocks.contains(node.getId())) {
showBlocks.remove(node.getId());
} else {
showBlocks.add(node.getId());
}
table.redrawRow(index);
}
});
table.addColumn(showBlocksColumn);
table.setColumnWidth(0, 10, Style.Unit.EM);
}
}
package com.raybased.gwt.configtool.client.grid;
import com.google.gwt.cell.client.AbstractCell;
import com.google.gwt.cell.client.Cell;
import com.google.gwt.cell.client.TextCell;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.user.cellview.client.CellTree;
import com.google.gwt.user.cellview.client.HasKeyboardSelectionPolicy.KeyboardSelectionPolicy;
import com.google.gwt.user.cellview.client.TreeNode;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwt.view.client.ListDataProvider;
import com.google.gwt.view.client.SingleSelectionModel;
import com.google.gwt.view.client.TreeViewModel;
import java.util.ArrayList;
import java.util.List;
public class NodesTree {
private CellTree tree;
public NodesTree(Node node) {
TreeViewModel model = new CustomTreeModel(node);
tree = new CellTree(model, null);
tree.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.ENABLED);
TreeNode rootNode = tree.getRootTreeNode();
openAll(rootNode);
}
private static class TopLevel {
private final String name;
private List<Node> blocks = new ArrayList<>();
public TopLevel(String name) {
this.name = name;
}
public TopLevel(String name, List<Node> blocks) {
this.name = name;
this.blocks = blocks;
}
public String getName() {
return name;
}
public List<Node> getBlocks() {
return blocks;
}
}
private static class CustomTreeModel implements TreeViewModel {
private final List<TopLevel> topLevels;
private final SingleSelectionModel<String> selectionModel
= new SingleSelectionModel<>();
public CustomTreeModel(Node node) {
topLevels = new ArrayList<>();
{
TopLevel blocksNode = new TopLevel("Blocks", new ArrayList(node.getBlocks()));
topLevels.add(blocksNode);
}
{
TopLevel outgoing = new TopLevel("Outgoing");
topLevels.add(outgoing);
}
{
TopLevel incoming = new TopLevel("Incoming");
topLevels.add(incoming);
}
}
public <T> NodeInfo<?> getNodeInfo(T value) {
if (value == null) {
// LEVEL 0.
ListDataProvider<TopLevel> dataProvider
= new ListDataProvider<>(
topLevels);
Cell<TopLevel> cell = new AbstractCell<TopLevel>() {
#Override
public void render(Context context, TopLevel value, SafeHtmlBuilder sb) {
sb.appendHtmlConstant(" ");
sb.appendEscaped(value.getName());
}
};
return new DefaultNodeInfo<>(dataProvider, cell);
} else if (value instanceof TopLevel) {
// LEVEL 1.
ListDataProvider<Node> dataProvider = new ListDataProvider<>(((TopLevel) value).getBlocks());
Cell<Node> cell = new AbstractCell<Node>() {
#Override
public void render(Context context, Node value, SafeHtmlBuilder sb) {
if (value != null) {
sb.appendHtmlConstant(" ");
sb.appendEscaped("(" + value.getName() + ")");
}
}
};
return new DefaultNodeInfo<>(dataProvider, cell);
} else if (value instanceof Node) {
// LEVEL 2 - LEAF.
String params = "test";
ArrayList<String> str = new ArrayList<>();
str.add(params);
ListDataProvider<String> dataProvider = new ListDataProvider<>(str);
return new DefaultNodeInfo<>(dataProvider, new TextCell(), selectionModel, null);
}
return null;
}
public boolean isLeaf(Object value) {
if (value instanceof String) {
return true;
}
return false;
}
}
private void openAll(TreeNode rootNode) {
if (rootNode == null) return;
for (int i = 0; i < rootNode.getChildCount(); i++) {
TreeNode node = rootNode.setChildOpen(i, true);
openAll(node);
}
}
public Widget getWidget() {
return tree;
}
}
package com.raybased.gwt.configtool.client.grid;
import com.google.gwt.dom.builder.shared.DivBuilder;
import com.google.gwt.dom.builder.shared.TableCellBuilder;
import com.google.gwt.dom.builder.shared.TableRowBuilder;
import com.google.gwt.dom.client.Style;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;
import com.google.gwt.user.cellview.client.AbstractCellTable;
import com.google.gwt.user.cellview.client.AbstractCellTableBuilder;
import com.google.gwt.user.cellview.client.Column;
import com.google.gwt.view.client.SelectionModel;
public class CustomCellTableBuilder extends AbstractCellTableBuilder<Node> {
NodesGrid nodesGrid;
private final String rowStyle;
private final String selectedRowStyle;
private final String cellStyle;
private final String selectedCellStyle;
/**
* Construct a new table builder.
*
* #param cellTable the table this builder will build rows for
*/
public CustomCellTableBuilder(NodesGrid nodesGrid, AbstractCellTable<Node> cellTable) {
super(cellTable);
this.nodesGrid = nodesGrid;
AbstractCellTable.Style style = cellTable.getResources().style();
rowStyle = style.evenRow();
selectedRowStyle = " " + style.selectedRow();
cellStyle = style.cell() + " " + style.evenRowCell();
selectedCellStyle = " " + style.selectedRowCell();
}
#Override
protected void buildRowImpl(Node rowValue, int absRowIndex) {
// Calculate the row styles.
SelectionModel<? super Node> selectionModel = cellTable.getSelectionModel();
boolean isSelected =
(selectionModel == null || rowValue == null) ? false : selectionModel
.isSelected(rowValue);
StringBuilder trClasses = new StringBuilder(rowStyle);
if (isSelected) {
trClasses.append(selectedRowStyle);
}
String cellStyles = cellStyle;
if (isSelected) {
cellStyles += selectedCellStyle;
}
TableRowBuilder row = startRow();
row.className(trClasses.toString());
buildRow(row, rowValue, cellStyles, nodesGrid.getShowBlocksColumn());
buildRow(row, rowValue, cellStyles, nodesGrid.getNameColumn());
row.endTR();
if (nodesGrid.getShowBlocks().contains(rowValue.getId())) {
buildBlockRow(rowValue, cellStyles);
}
}
void buildRow(TableRowBuilder row, Node rowValue, String cellStyles, Column column) {
TableCellBuilder td = row.startTD();
td.className(cellStyles);
td.style().outlineStyle(Style.OutlineStyle.NONE).endStyle();
renderCell(td, createContext(0), column, rowValue);
td.endTD();
}
private void buildBlockRow(Node rowValue, String cellStyles) {
TableRowBuilder row = startRow();
buildCell(rowValue, cellStyles, row);
row.endTR();
}
private void buildCell(Node rowValue, String cellStyles, TableRowBuilder row) {
NodesTree hw = new NodesTree(rowValue);
TableCellBuilder td = row.startTD().colSpan(5);
td.className(cellStyles);
DivBuilder div = td.startDiv();
String t = hw.getWidget().getElement().getInnerHTML();
div.html(SafeHtmlUtils.fromTrustedString(t));
div.end();
td.endTD();
}
}
package com.raybased.gwt.configtool.client.grid;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
public class Node implements Serializable {
String name;
List<Node> blocks = new ArrayList<>();
String params;
int id;
public Node() {
}
public String getParams() {
return params;
}
public void setParams(String params) {
this.params = params;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Node> getBlocks() {
return blocks;
}
}