I am using DataGrid in a GWT. One of the column is TextIntputCell. I want to place one tooltip on the same cell to show the updated value at each FieldUpdter Event.
Following is the code.
TextInputCell commentCell= new TextInputCell();{
#Override
public void render(com.google.gwt.cell.client.Cell.Context context, String value, SafeHtmlBuilder sb) {
String imagePath = GWT.getModuleBaseURL() + "/images/about.png";
sb.appendHtmlConstant(" ");
sb.appendHtmlConstant("<img src = '" + imagePath + "'height = '20px' width = '20px' title='"+value+"'/>");
}
};
commentColumn = new Column<RegisteredClasses, String>(commentCell) {
#Override
public String getValue(RegisteredClasses object) {
return "";
}
};
FieldUpdater<RegisteredClasses, String> commentUpdater = new FieldUpdater<RegisteredClasses, String>() {
#Override
public void update(int index, RegisteredClasses object, String value) {
if(value != null ){
object.setCommentsByContractor(value);
}
}
};
commentColumn.setFieldUpdater(commentUpdater);
table.addColumn(commentColumn, localizableResource.onAcceptanceComment());
table.setColumnWidth(commentColumn, "280px");
This is not working as the render event is called once only. Is there any way to call it explicitly.
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 a table with a nameColumn.
I want that when user mouseOver the title of nameColumn it will trigger a method
I tried:
Header<String> nameColumnHeader = new Header<String>(new ClickableTextCell()) {
#Override
public String getValue() {
return "Name";
}
#Override
public final void onBrowserEvent(Context context, Element elem, NativeEvent event) {
if ("mouseover".equals(event.getType())) {
//
meaningMessagesPopup.show();
}
else if("mouseout".equals(event.getType())){
meaningMessagesPopup.hide();
}
}
};
table.addColumn(nameColumn, nameColumnHeader);
But seem Gwt did not recognize "mouseover".equals(event.getType())
Do you know how to do the MOUSEOVER event in GWT Header?
i found the answer, that is to create a CustomCell that extends AbstractCell
private class HeaderCell extends AbstractCell<String> {
private String text;
public HeaderCell(String text) {
/*
* Let the parent class know that our cell responds to click events and
* keydown events.
*/
//super("click", "keydown");
super("mouseover");
this.text=text;
}
#Override
public void onBrowserEvent(Context context, Element parent, String value,
NativeEvent event, ValueUpdater<String> valueUpdater) {
// Check that the value is not null.
if (value == null) {
return;
}
// Call the super handler, which handlers the enter key.
super.onBrowserEvent(context, parent, value, event, valueUpdater);
if ("mouseover".equals(event.getType())) {
SafeHtmlBuilder sb=new SafeHtmlBuilder();
sb.appendHtmlConstant("<b>");
sb.appendHtmlConstant("<font color=\"blue\">");
sb.appendEscaped(text);
sb.appendHtmlConstant("</font></b>");
meaningMessagesPopup.setWidget(new HTML(sb.toSafeHtml()));
int left = event.getClientX() -140;
int top = event.getClientY() +30;
meaningMessagesPopup.setPopupPosition(left, top);
// Show the popup
meaningMessagesPopup.show();
}
else if ("mouseout".equals(event.getType())) {
meaningMessagesPopup.hide();
}
}
#Override
public void render(Context context, String value, SafeHtmlBuilder sb) {
/*
* Always do a null check on the value. Cell widgets can pass null to
* cells if the underlying data contains a null, or if the data arrives
* out of order.
*/
if (value == null) {
return;
}
sb.appendEscaped(value);
}
}
Then
Header<String> nameColumnHeader = new Header<String>(new HeaderCell("my Text...")) {
#Override
public String getValue() {
return "Name";
}
};
table.addColumn(nameColumn, nameColumnHeader);
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).
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());
}
});
I have tried this but didn't work
Column<ContactInfo, String> imageColumn = new Column<ContactInfo, String>(new ImageCell()) {
#Override
public String getValue(ContactInfo object) {
return "contact.jpg";
}
};
imageColumn.setFieldUpdater(new FieldUpdater<ContactInfo, String>() {
#Override
public void update(int index, ContactInfo object, String value) {
Window.alert("You clicked " + object.firstName);
}
});
cellTable.addColumn(imageColumn, SafeHtmlUtils.fromSafeConstant("<br/>"));
public class ButtonImageCell extends ButtonCell{
#Override
public void render(com.google.gwt.cell.client.Cell.Context context,
String value, SafeHtmlBuilder sb) {
SafeHtml html = SafeHtmlUtils.fromTrustedString(new Image(value).toString());
sb.append(html);
}
}
in use:
final Column<ReportDTOProxy, String> buttonImageCellTest = new Column<ProxyObject, String>(new ButtonImageCell()) {
#Override
public String getValue(ProxyObject row) {
//url to image
return row.getImageUrl();
}
};
You can extend ImageCell class and override 2 it's methods - getConsumedEvents and onBrowserEvent. Example:
private class MyImageCell extends ImageCell{
#Override
public Set<String> getConsumedEvents() {
Set<String> consumedEvents = new HashSet<String>();
consumedEvents.add("dblclick");
return consumedEvents;
}
#Override
public void onBrowserEvent(Context context, Element parent,
String value, NativeEvent event,
ValueUpdater<String> valueUpdater) {
switch (DOM.eventGetType((Event)event)) {
case Event.ONDBLCLICK:
// TODO
break;
default:
break;
}
}
}
I did something similar mixing a Button cell with the renderer from an ImageCell....
ButtonCell bc = new ButtonCell() {
#Override
public void render(Context context, SafeHtml data, SafeHtmlBuilder sb) {
if (data != null) {
ImageResource icon = Icons.BUNDLE.pieChart();
SafeHtml html = SafeHtmlUtils.fromTrustedString(AbstractImagePrototype.create(icon).getHTML());
sb.append(html);
}
}
};
You get the idea. The only problem is that it does not display the "hand" icon when you hover over it.... likely it can be fixed by setting the CSS.
You can try this rather than using ButtonCell or ImageCell. This will work for sure. As I have implemented for my requirement. Let me know how does it goes..
ClickableTextCell imageCell = new ClickableTextCell() {
#Override
public void render(Context context, SafeHtml data, SafeHtmlBuilder sb) {
if (data != null) {
String imagePath = "icon.png";
sb.append(imagePath);
}
}
};
Column<ContactInfo, String> imageColumn = new Column<ContactInfo, String>(imageCell) {
#Override
public String getValue(ContactInfo object) {
return "";
}
};
imageColumn.setFieldUpdater(new FieldUpdater<ContactInfo, String>() {
#Override
public void update(int index, ContactInfo object, String value) {
Window.alert("You clicked " + object.firstName);
}
});
cellTable.addColumn(imageColumn, SafeHtmlUtils.fromSafeConstant("<br/>"));
A good solution for this issue, if you use ActionCell that is able to handle clicking. The use of it is a bit complicatied, but for me it worked pretty well.
First you need to initialize ActionCell with a delegate, in the constructor, write new ActionCell.Delegate<your class>. In this override the method execute and in that write your code that handle the clicking event.
The other thing you need to do is building up a html from the image. The SafeHtmlUtils class gives you a very easy way to do that. It's fromTrustedString method helps you building up the html:
SafeHtmlUtils.fromTrustedString(AbstractImagePrototype.create ("Your image from a resource class").getHTML());
This way the SafeHtml field can be initalized and if you give the ActionCell's contructor the SafeHtml and the Delegate, that it will do the work for you.
In this example a button will be initialized with the image from the bundle file in it. You can make it without the button if you override the render method of the ActionCell and append the SafeHtmlBuilder in the method with the same SafeHtml variable as above.
My code looks like the following:
IdentityColumn<Type> imageCell = new IdentityColumn<Type>(new ActionCell<Type>("AnyString",
new ActionCell.Delegate<Type>() {
#Override
public void execute(final Type item) {
"your code"
}
}) {
#Override
public void render(Context context, Type value, SafeHtmlBuilder sb) {
if (value != null) {
SafeHtml html = SafeHtmlUtils.fromTrustedString(AbstractImagePrototype.create(resource.image).getHTML());
sb.append(html);
}
}
});
You'd rather override the method in an another class but I didn't want to split them for this post. It worked for me very well, I hope it will help other's too.
I got all the above and added them in my app. Thanks to all. stackoverflow rocks!
ButtonCell bc = new ButtonCell() {
#Override
public void render(Context context, SafeHtml data, SafeHtmlBuilder sb) {
if (data != null) {
ImageResource icon = Connector.imageResources.minus();
Image image = new Image(icon);
//fix the mouse pointer
image.getElement().getStyle().setCursor(Cursor.POINTER);
//Do something with the DATA
image.setTitle("Delete " + data.asString());
SafeHtml html = SafeHtmlUtils.fromTrustedString(image.toString());
sb.append(html);
}
}
};
Column<InstanceProperty, String> imageColumn = new Column<InstanceProperty, String>(bc) {
#Override
public String getValue(InstanceProperty object) {
//return the DATA
return object.getKey();
}
};
imageColumn.setFieldUpdater(new FieldUpdater<InstanceProperty, String>() {
#Override
public void update(int index, InstanceProperty property,
String value) {
//you can also use the DATA to do something
InstancePropertiesTable.this.dataProvider.getList().remove(index);
}
});
addColumn(imageColumn, "");
This worked for me:
public class ButtonImageCell extends ButtonCell{
#Override
public void render(com.google.gwt.cell.client.Cell.Context context,
String renderedHtmlStr, SafeHtmlBuilder sb) {
sb.appendHtmlConstant(renderedHtmlStr);
}
}
In a class containing CellTable table:
TableResources resources = GWT.create(TableResources.class);
ImageResourceRenderer imageRenderer = new ImageResourceRenderer();
...
Column<MyRecord, String> buttonCol = new Column<MyRecord, String>(new ButtonImageCell()) {
#Override
public String getValue(MyRecord record) {
if(record.isOn())
return imageRenderer.render(resources.getOnImg()).asString();
else
return imageRenderer.render(resources.getOffImg()).asString();
}
};
buttonCol.setFieldUpdater(new FieldUpdater<MyRecord, String>() {
public void update(int index, MyRecordobject, String value) {
if (Window.confirm("Do stuff?")) {
//todo: stuff
}
}
});
...
table.addColumn(buttonCol, "");
Where the ImageResource comes from (resources):
public interface TableResources extends CellTable.Resources {
interface TableStyle extends CellTable.Style {
}
#Source("/images/on.png")
ImageResource getOnImg();
#Source("/images/off.png")
ImageResource getOffImg();
}
You need to sinkEvents() with appropriate bits.
Refer to answer of Question Adding ClickHandler to div which contains many other widget.