I have this buttoncell
It's returning a string, but can i return an actual button instead of this string "ReList", to which I can add ClickHandler, which i can disable, hide etc.
(as i want to disable/hide this cell)
ButtonCell reListCell = new ButtonCell();
reListColumn = new Column<EmployerJobs, String>(reListCell) {
#Override
public String getValue(EmployerJobs object) {
return "ReList";
}
};
You have to add a FieldUpdater to the Column. See here for details.
ButtonCell reListCell = new ButtonCell();
reListColumn = new Column<EmployerJobs, String>(reListCell) {
#Override
public String getValue(EmployerJobs object) {
return "ReList";
}
};
reListColumn.setFieldUpdater(new FieldUpdater<EmployerJobs,String>() {
#Override
public void update(int index, EmployerJobs object, String value) {
Window.alert("You clicked " + object.someField());
}
});
Related
I had my data in a FlexTable, but am migrating to a DataGrid so I can easily add pagination. I get the data via a REST call. I can't seem to get the data to actually display. Here are the relevant snippets:
private DataGrid<SearchResult> resultsGrid = new DataGrid<SearchResult>();
resultsGrid.setAutoHeaderRefreshDisabled(true);
TextColumn<SearchResult> titleColumn = new TextColumn<SearchResult>() {
#Override
public String getValue(SearchResult object) {
return object.getTitle();
}
};
resultsGrid.addColumn(titleColumn, "Document Title");
ButtonCell buttonCell = new ButtonCell();
Column<SearchResult, String> buttonColumn = new Column<SearchResult, String>(buttonCell){
#Override
public String getValue(SearchResult object) {
return "Show";
}
};
resultsGrid.addColumn(buttonColumn, "");
buttonColumn.setFieldUpdater(new FieldUpdater<SearchResult, String>() {
public void update(int index, SearchResult object, String value) {
doPreview(object.title);
}
});
TextColumn<SearchResult> roleColumn = new TextColumn<SearchResult>() {
#Override
public String getValue(SearchResult object) {
return object.getRoles();
}
#Override
public String getCellStyleNames(Context context, SearchResult object) {
if (object.containsCurrentRole)
return "highlight";
else
return null;
}
};
resultsGrid.addColumn(roleColumn, "Associated Roles");
final SingleSelectionModel<SearchResult> selectionModel = new SingleSelectionModel<SearchResult>();
resultsGrid.setSelectionModel(selectionModel);
selectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {
public void onSelectionChange(SelectionChangeEvent event) {
SearchResult selected = selectionModel.getSelectedObject();
if (selected != null) {
clearWordCloud();
getWordCloud(selected.getTitle());
}
}
});
dataProvider.addDataDisplay(resultsGrid);
// Create a Pager to control the table.
SimplePager.Resources pagerResources = GWT.create(SimplePager.Resources.class);
pager = new SimplePager(TextLocation.CENTER, pagerResources, false, 0, true);
pager.setDisplay(resultsGrid);
resultsGrid.setVisible(true);
resultsGrid.addStyleName("results");
mainPanel.add(resultsGrid);
...
The function that gets called after a search:
private void updateTable(List<SearchResult> results) {
dataProvider.getList().addAll(results);
dataProvider.refresh();
dataProvider.flush();
resultsGrid.setVisible(true);
resultsFlexTable.setVisible(true);
}
At first I was missing the flush and refresh, but adding them had no effect. I'm kind of stumped.
The most likely problem is that your DataGrid has a height of zero. DataGrid implements RequiresResize, which means that its height either has to be set explicitly, or it will acquire its height from a parent widget if this parent widget implements ProvidesResize. FlexTable does not implement ProvidesResize interface.
NB: You don't need flush and refresh - adding data to the DataProvider refreshes the grid.
I have two buttons(edit + delete) in one column.
ButtonCell functionButtonCell = new ButtonCell() {
#Override
public void render(final Context context, final SafeHtml data, final SafeHtmlBuilder sb) {
sb.appendHtmlConstant("<button type='button' class='gwt-Button' style = 'width:60px;margin:1px;'>Edit</button>");
sb.appendHtmlConstant("<br/>");
sb.appendHtmlConstant("<button type='button' class='gwt-Button' style = 'width:60px;margin:1px;'>Delete</button>");
}
};
functionColumn = new Column<AdminModel, String>(functionButtonCell) {
public String getValue(final AdminModel object) {
return object.getSeq().toString();
}
};
Bind event for this column in Presenter as
.........
view.getFunctionColumn().setFieldUpdater(new FieldUpdater<AdminModel, String>() {
public void update(final int index, final AdminModel object, final String value) {
Window.alert(index + "-" + value);
}
});
After clicked on edit button , alert-box has appeared , but not on delete button. When I clicked on delete button , nothing has appeared. What would be the problem ?
Addition: How can I decide which button was clicked by user (edit or delete) from my presenter ?
I would really appreciate any of your suggestions because I am troubled on it for a long times. Thanks!
ButtonCell filters events on the first child element only: https://gwt.googlesource.com/gwt/+/2.6.1/user/src/com/google/gwt/cell/client/ButtonCell.java This is why you don't get an event when clicking the second button (note: the goal of that code is to make sure you clicked on the button, and not on blank space around the button; see https://gwt.googlesource.com/gwt/+/a0dc88c8be7408be9554f746eb1ec93798183a28)
The easiest way to implement a two-button cell is to use a CompositeCell; it requires that child cells are rendered into sibling elements though (uses <span>s by default, example below overrides the rendering to use <div>s so your buttons stack each on its own line).
new CompositeCell<AdminModel>(Arrays.asList(
// First button
new HasCell<AdminModel, String>() {
#Override public Cell<String> getCell() { return new ButtonCell(); }
#Override public FieldUpdated<AdminModel, String> getFieldUpdater() {
return new FieldUpdater<AdminModel, String>() {
#Override public void update(int index, AdminModel object, String value) {
Window.alert("Edit " + object.getId());
}
};
}
#Override public String getValue(AdminModel o) {
return "Edit";
}
},
// Second button
new HasCell<AdminModel, String>() {
#Override public Cell<String> getCell() { return new ButtonCell(); }
#Override public FieldUpdated<AdminModel, String> getFieldUpdater() {
return new FieldUpdater<AdminModel, String>() {
#Override public void update(int index, AdminModel object, String value) {
Window.alert("Delete " + object.getId());
}
};
}
#Override public String getValue(AdminModel o) {
return "Delete";
}
}) {
#Override protected <X> void render(Cell.Context context, AdminModel value, SafeHtmlBuilder sb, HasCell<String,X> hasCell) {
// use a <div> instead of the default <span>
Cell<X> cell = hasCell.getCell();
sb.appendHtmlConstant("<div>");
cell.render(context, hasCell.getValue(value), sb);
sb.appendHtmlConstant("</div>");
}
};
(note: in your case, because the button's text doesn't depend on the row object, maybe you should rather use an ActionCell; it would better fit "semantically" with what you're doing, but otherwise it's almost the same; with an ActionCell, you'd use HasCell<AdminModel, AdminModel>, ActionCell<AdminModel>, getFieldUpdater would return null, and thegetValueof theHasCellwould just return theAdminModel` argument as-is).
Otherwise, implement your Cell (or AbstractCell) entirely by yourself.
Ideally, a column should have only one type of cell be it ImageCell, ButtonCell etc. Because all this ImageCell and ButtonCell does not provide any in-built events. The events are handled by FieldUpdater itself which does not have differentiators to identify that which ButtonCell is clicked. Ideally on click of that column, the field-updater will be called.
You should rather create your own composite widget which extends HasCell. This composite widget will have two different buttons and those in built methods are called on click of respective button.
public void onModuleLoad() {
CellTable<Person> table = new CellTable<Person>();
List<HasCell<Person, ?>> cells = new LinkedList<HasCell<Person, ?>>();
cells.add(new ActionHasCell("Edit", new Delegate<Person>() {
#Override
public void execute(Person object) {
// EDIT CODE
}
}));
cells.add(new ActionHasCell("Delete", new Delegate<Person>() {
#Override
public void execute(Person object) {
// DELETE CODE
}
}));
CompositeCell<Person> cell = new CompositeCell<Person>(cells);
table.addColumn(new TextColumn<Person>() {
#Override
public String getValue(Person object) {
return object.getName()
}
}, "Name");
// ADD Cells for Age and Address
table.addColumn(new Column<Person, Person>(cell) {
#Override
public Person getValue(Person object) {
return object;
}
}, "Actions");
}
private class ActionHasCell implements HasCell<Person, Person> {
private ActionCell<Person> cell;
public ActionHasCell(String text, Delegate<Person> delegate) {
cell = new ActionCell<Person>(text, delegate);
}
#Override
public Cell<Person> getCell() {
return cell;
}
#Override
public FieldUpdater<Person, Person> getFieldUpdater() {
return null;
}
#Override
public Person getValue(Person object) {
return object;
}
}
Also, see the link below.
[GWT CellTable-Need to have two buttons in last single cell of each row
I try to add button into rowExpander content:
so i have:
ButtonCell<Integer> viewButtonCell = new ButtonCell<Integer>();
and row expander
RowExpander<XX> expander = new RowExpander<XX>(identity, new AbstractCell<XX>() {
#Override
public void render(Context context, XX value, SafeHtmlBuilder sb) {
sb.appendHtmlConstant("<span>");
viewButtonCell.render(context, value.getId(), sb);
sb.appendHtmlConstant("</span>");
}
ButtonCell is rendered OK i can see it BUT I cannot click it, no selecthandler from ButtonCell is call :(.
Any ideas how can I make selectHandlerActive for this button ?
Thanks
i created some new RowExpander :
public class MTPRowExpander<M> extends RowExpander<M> {
public static int id = 0;
public static interface WidgetFactory<M> {
public Widget createWidget(M model);
}
private WidgetFactory<M> wf;
private Set<Integer> expandedRows;
public MTPRowExpander(IdentityValueProvider<M> valueProvider,WidgetFactory<M> wf) {
this(valueProvider,GWT.<RowExpanderAppearance<M>> create(RowExpanderAppearance.class),wf);
}
public MTPRowExpander(IdentityValueProvider<M> valueProvider,final RowExpanderAppearance<M> appearance, WidgetFactory<M> wf) {
super(valueProvider, null, appearance);
this.wf = wf;
expandedRows = new HashSet<Integer>();
}
#Override
protected boolean beforeExpand(M model, Element body, XElement row,int rowIndex) {
if (expandedRows.contains(rowIndex)) {
return true;
} else {
expandedRows.add(rowIndex);
return super.beforeExpand(model, body, row, rowIndex);
}
}
#Override
protected String getBodyContent(final M model, int rowIndex) {
final int curentid = id++;
Scheduler.get().scheduleFinally(new ScheduledCommand() {
#Override
public void execute() {
Widget widget = wf.createWidget(model);
com.google.gwt.dom.client.Element item = grid.getElement().childElement(".widget" + curentid);
item.appendChild(widget.getElement());
ComponentHelper.setParent(grid, widget);
}
});
return "<div class='widget" + curentid + "'></div>";
}
}
I know that this solution is not perfect but I didnt know how to resolve problem at more proper way.
I have DataGrid where one on of the columns contains images. I used this code to generate the column.
Column<Job, String> expandHideColumn = new Column<Job, String>(
imageCell) {
#Override
public String getValue(Job object) {
return null;
}
#Override
public void render(Context context, Job Object, SafeHtmlBuilder sb) {
sb.appendHtmlConstant("<img src='images/expand.jpeg' style='cursor: pointer' />");
}
}
What I want is on clicking the image it has to change. For this I added a click handler on the ImageCell like this
ImageCell imageCell = new ImageCell() {
#Override
public Set<String> getConsumedEvents() {
Set<String> events = new HashSet<String>();
events.add("click");
return events;
}
};
In the onBrowserEvent method I wrote this
#Override
public void onBrowserEvent(Context context, Element element,
Job job, NativeEvent event) {
if (element.getFirstChildElement().isOrHasChild(
Element.as(event.getEventTarget()))) {
if (element.getFirstChildElement().getPropertyString("src")
.matches("(.*)expand.jpeg")) {
element.getFirstChildElement().setPropertyString("src",
"images/collapse.jpeg");
} else {
element.getFirstChildElement().setPropertyString("src",
"images/expand.jpeg");
}
}
}
I don't think this is a good approach to change images on click event. Is there a better solution?
You can use a column value for know the state of the column :
Column<Job, Boolean> expandHideColumn = new Column<Job, Boolean>(new ImageExpandCollapseCell()) {
#Override
public Boolean getValue(Job object) {
return object.isExpand(); //The object know the expand state ?
}
}
expandHideColumn.setValueUpdater(new FieldUpdater<Job, Boolean>() {
void update(int index, Job object, Boolean value) {
object.setExpand(value);
}
});
The ImageExpandCollapseCell look like this :
public class ImageExpandCollapseCell extends AbstractCell<Boolean> {
final String EXPAND = "images/expand.jpeg";
final String COLLAPSE = "images/collapse.jpeg";
interface Template extends SafeHtmlTemplates {
#Template("<div style=\"float:right\"><img src=\"" + url + "\"></div>")
SafeHtml img(String url);
}
private static Template template;
/**
* Construct a new ImageCell.
*/
public ImageCell() {
super("click"); //Replace your getConsumedEvents()
if (template == null) {
template = GWT.create(Template.class);
}
}
#Override
public void render(Context context, Boolean value, SafeHtmlBuilder sb) {
if (value != null) {
sb.append(template.img(UriUtils.fromSafeConstant(value ? EXPAND : COLLAPSE)));
}
}
#Override
public void onBrowserEvent(Context context, Element element,
Boolean value, NativeEvent event, ValueUpdater<Boolean> valueUpdater) {
valueUpdate.update(!value);
}
}
I improve the proposed version of user905374
It's not a good idea to instantiate new value in the render method.
The column render method call the Cell render method, you musn't replace it !
With the FieldUpdater, you can change the state of the image : expand or collapse and update the cell display (it will be rendered again).
am using GWT 2.4, Hibernate and MysQL
I created a cell table , when i click on a cell i want to display the data/value in that particular cell
Thanks in advance
#override
public Widget onInitialize(){
CellTable grid = new CellTable<Bean>();
grid.setWidth("100%",true);
setColumns(grid);
}
private void setColumns(CellTable grid){
Column<Bean, String> firstNameColumn = new Column<Bean, String>(
new EditTextCell()) {
#Override
public String getValue(Bean object) {
return object.getFirstName();
}
};
firstNameColumn.setSortable(true);
grid.addColumn(firstNameColumn, "First Name");
Column<Bean, String> imageColumn = new Column<Bean, String>(
new ClikableTextCell()) {
#Override
public String getValue(Bean object) {
return "clickhere";
}
};
imageColumn.setSortable(true);
grid.addColumn(imageColumn, "Add Information");
firstNameColumn.setFieldUpdater(new FieldUpdater<Bean, String>() {
public void update(int index, Bean object, String value) {
Window.alert("You clicked " + object.getFullName());
}
});
cellTable.setColumnWidth(firstNameColumn, 20, Unit.PCT);
}
Use DataProvider and SingleSelectionModel for you cellTable:
private final ListDataProvider<SomeClass> dataProvider = new ListDataProvider<SomeClass>();
private final SingleSelectionModel<SomeClass> selectionModel = new SingleSelectionModel<SomeClass>();
//then
table.setSelectionModel(selectionModel);
dataProvider.addDataDisplay(table);
Heres how u can get the selected objects info:
showDataValueOfCellBtn.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
SomeClass selected = selectionModel.getSelectedObject();
Window.alert (selected.getValue());
}
});