I am using following code.
But addvaluechangedHandler fires twice in gwt.
what other method should i use so that it will occur only once?
calendar.addValueChangeHandler(new ValueChangeHandler<Date>() {
#Override
public void onValueChange(ValueChangeEvent<Date> event) {
Date newDate = calendar.getValue();
newDate.setDate(newDate.getDate()+1);
if ((newDate.before(todaysDate))) {
Window.alert("You can not choose past dates before " +todaysDate);
calendar.setValue(null);
}
}
});
See http://code.google.com/p/google-web-toolkit/issues/detail?id=4785
The workaround seems to be:
public class DateBoxOneEvent extends DateBox {
#Override
public void setValue(Date date, boolean fireEvents) {
if (date != null) {
date.setHours(0);
date.setMinutes(0);
date.setSeconds(0);
}
super.setValue(date, fireEvents);
}
}
Related
I have an webapp with a large collection. So my user get a text box to filter the collection.
But every time the user put in one letter the filter action starts. This is very slow some times.
So I want only get the value change event when the user stop typing for one second.
I tried it this way:
#Override
public void onValueChange( ValueChangeEvent<String> event )
{
Timer t = new Timer()
{
#Override
public void run()
{
addChangeHandler( new ChangeHandler()
{
#Override
public void onChange( ChangeEvent event1 )
{
ValueChangeEvent.fire( TextBoxPSG.this, getValue() );
}
} );
}
};
t.schedule( 15000 );
}
But this doesn't work.
Maybe someone has an Idea or the same problem.
Thanks in advance.
Do not use ValueChangeEvent. Use KeyUpEvent.
private static Timer timer = new Timer() {
#Override
public void run() {
// do you filter work;
}
};
...
myTextBox.addKeyUpHandler(new KeyUpHandler() {
#Override
public void onKeyUp(KeyUpEvent event) {
if (timer.isRunning()) {
timer.cancel();
}
timer.schedule(1000);
}
});
I want to create a Cell factory that returns a TableCell that behaves exactly like TextFieldTableCell, with the following difference: When it loses focus, it commits the changes.
My code is very simple:
public final class TextFieldCellFactory<S, T> implements Callback<TableColumn<S, T>, TableCell<S, T>> {
#Override
public TableCell<S, T> call(TableColumn<S, T> p) {
class EditingCell extends TextFieldTableCell {
public EditingCell() {
super();
setConverter(new DefaultStringConverter());
focusedProperty().addListener(new ChangeListener() {
#Override
public void changed(ObservableValue observable, Object oldValue, Object newValue) {
System.out.println("changed!");
System.out.println("getText() = " + getText());
System.out.println("textProperty() = " + textProperty().get());
System.out.println("getItem = " + getItem());
}
});
}
#Override
public void startEdit() {
super.startEdit();
}
#Override
public void cancelEdit() {
super.cancelEdit();
}
}
return new EditingCell();
}
}
As you see I add a change listener in the focusedProperty. The problem is that the change method is not called (nothing is printed).
How can I get the desired behaviour? Thank you.
Basically, you have to register the listener with the textField's (not the cell's) focusedProperty. As the textfield is a private field of super, it's not directly accessible - you have to look it up once after it was added to the cell. That's when an edit was started for the first time:
private TextField myTextField;
#Override
public void startEdit() {
super.startEdit();
if (isEditing() && myTextField == null) {
// most simple case, assuming that there is no graphic other than the field
// TBD: implement the general case: walk the tree and find the field
myTextField = (TextField) getGraphic();
myTextField.focusedProperty().addListener((e, old, nvalue) -> {
if (!nvalue) {
T edited = getConverter().fromString(myTextField.getText());
commitEdit(edited);
}
});
}
}
Some notes:
this is a workaround around an open issue (vote for it!)
since jdk8, it's not entirely functional: won't commit if you click somewhere else inside the table
a recent answer uses a binding approach which might or not be fully functional (didn't test)
I have a SuggestionBox in GWT. Is there a way to clear it when it blurs (unless the user made a selection, in which case an action should happen)?
Add a BlurHandler:
suggestionBox.getValueBox().addBlurHandler(new BlurHandler() {
#Override
public void onBlur(BlurEvent event) {
// your code goes here
}
});
Try this one using ValueChangeHandler:
Note: ValueChange event has same behavior as Blue event but it is fired only if value is changed in SuggestBox.
class MyMultiWordSuggestOracle extends MultiWordSuggestOracle {
private Set<String> values = new HashSet<String>();
#Override
public void add(String value) {
super.add(value);
values.add(value);
}
#Override
public void clear(){
super.clear();
values.clear();
}
public boolean contains(String value) {
return values.contains(value);
}
}
You code:
final MyMultiWordSuggestOracle oracle = new MyMultiWordSuggestOracle();
oracle.add("A");
oracle.add("AB");
oracle.add("BCD");
oracle.add("BCDE");
final SuggestBox suggestionBox = new SuggestBox(oracle);
suggestionBox.addValueChangeHandler(new ValueChangeHandler<String>() {
#Override
public void onValueChange(ValueChangeEvent<String> event) {
if (!oracle.contains(event.getValue())) {
suggestionBox.setValue("");
}
}
});
I want to get values of my textBox before change its value and after changed its value.
String beforeValue = "";
TextBox textBox = new TextBox();
textBox.addFocusHandler(new FocusHandler() {
public void onFocus(final FocusEvent event) {
beforeValue = textBox.getText();
}
});
textBox.addValueChangeHandler(new ValueChangeHandler<String>() {
public void onValueChange(final ValueChangeEvent<String> event) {
System.out.println("Before value is " + beforeValue);
System.out.println("After value is " + textBox.getText());
}
});
As above codes , I need two handlers (FocusHandler and ValueChangeHadler) to get before value and after value . My question is how can I get it by one Handler or another simple and easy way ? I don't want to use two handlers to get it. Any suggestions would be appreciated. Thanks in advance !
Your idea(using 2 handlers) is fair enough but its buggy. I don't think it can be done in a better way. If you want to use a single handler, create a custom class wrapper using the two handlers.
Here is the code for you.
public abstract class MyValueChangeHandler<T> implements ValueChangeHandler<T> {
T prevValue = null;
T value = null;
public MyValueChangeHandler(final ValueBoxBase<T> widget) {
widget.addFocusHandler(new FocusHandler() {
public void onFocus(FocusEvent event) {
prevValue = widget.getValue();
}
});
}
#Override
public void onValueChange(ValueChangeEvent<T> event) {
value = event.getValue();
onValueChange(value, prevValue);
// or
// onValueChange(event, prevValue);
prevValue = value;
}
public abstract void onValueChange(T value, T prevValue);
// or
// public abstract void onValueChange(ValueChangeEvent<T> event, T prevValue);
}
And you can use it as,
TextBox box = new TextBox();
box.addValueChangeHandler(new MyValueChangeHandler<String>(box) {
#Override
public void onValueChange(String value, String prevValue) {
Window.alert("Prev Value : " + prevValue + " CurrnetValue: "
+ value);
}
});
I have implemented a GEF editor for a graph-like EMF model, with a remove command for a certain type of node in the graph. I think I've done all the necessary steps in order to make this set up work (vainolo's blog has been a great help).
However, when I'm deleting a model element, the view doesn't get refreshed, i.e., the figure for the model element isn't removed from the editor view, and I have no idea why. I'd be extremely grateful if somebody could have a look at my sources and point me to any problems (and possibly solutions :)). Many thanks in advance!
Below are what I think are the important classes for this issue. Please do let me know should I add further code/edit the code, etc. (I've left out code that I thought doesn't help, e.g., getters and setters, class variables). Thanks!
DiagramEditPart
public class DiagramEditPart extends AbstractGraphicalEditPart {
public DiagramEditPart(Diagram model) {
this.setModel(model);
adapter = new DiagramAdapter();
}
#Override protected IFigure createFigure() {
Figure figure = new FreeformLayer();
return figure;
}
#Override protected void createEditPolicies() {
installEditPolicy(EditPolicy.LAYOUT_ROLE, new DiagramXYLayoutPolicy());
}
#Override protected List<EObject> getModelChildren() {
List<EObject> allModelObjects = new ArrayList<EObject>();
if (((Diagram) getModel()).getMyNodes() != null)
allModelObjects.addAll(((Diagram) getModel()).getMyNodes());
return allModelObjects;
}
#Override public void activate() {
if(!isActive()) {
((Diagram) getModel()).eAdapters().add(adapter);
}
super.activate();
}
#Override public void deactivate() {
if(isActive()) {
((Diagram) getModel()).eAdapters().remove(adapter);
}
super.deactivate();
}
public class DiagramAdapter implements Adapter {
#Override public void notifyChanged(Notification notification) {
switch (notification.getEventType()) {
case Notification.REMOVE: refreshChildren();
break;
default:
break;
}
}
#Override public Notifier getTarget() {
return (Diagram) getModel();
}
#Override public void setTarget(Notifier newTarget) {
// Do nothing.
}
#Override public boolean isAdapterForType(Object type) {
return type.equals(Diagram.class);
}
}
}
MyNodeEditPart
public class MyNodeEditPart extends AbstractGraphicalEditPart {
public MyNodeEditPart(MyNode model) {
this.setModel(model);
adapter = new MyNodeAdapter();
}
#Override protected IFigure createFigure() {
return new MyNodeFigure();
}
#Override protected void createEditPolicies() {
installEditPolicy(EditPolicy.COMPONENT_ROLE, new MyNodeComponentEditPolicy());
}
#Override protected void refreshVisuals() {
MyNodeFigure figure = (MyNodeFigure) getFigure();
DiagramEditPart parent = (DiagramEditPart) getParent();
Dimension labelSize = figure.getLabel().getPreferredSize();
Rectangle layout = new Rectangle((getParent().getChildren().indexOf(this) * 50),
(getParent().getChildren().indexOf(this) * 50), (labelSize.width + 20),
(labelSize.height + 20));
parent.setLayoutConstraint(this, figure, layout);
}
public List<Edge> getModelSourceConnections() {
if ((MyNode) getModel() != null && ((MyNode) getModel()).getDiagram() != null) {
ArrayList<Edge> sourceConnections = new ArrayList<Edge>();
for (Edge edge : ((MyNode) getModel()).getDiagram().getOutEdges(((MyNode) getModel()).getId())) {
sourceConnections.add(edge);
}
return sourceConnections;
}
return null;
}
// + the same method for targetconnections
#Override public void activate() {
if (!isActive()) {
((MyNode) getModel()).eAdapters().add(adapter);
}
super.activate();
}
#Override public void deactivate() {
if (isActive()) {
((MyNode) getModel()).eAdapters().remove(adapter);
}
super.deactivate();
}
public class MyNodeAdapter implements Adapter {
#Override
public void notifyChanged(Notification notification) {
refreshVisuals();
}
#Override
public Notifier getTarget() {
return (MyNode) getModel();
}
#Override
public void setTarget(Notifier newTarget) {
// Do nothing
}
#Override
public boolean isAdapterForType(Object type) {
return type.equals(MyNode.class);
}
}
}
MyNodeComponentEditPolicy
public class MyNodeComponentEditPolicy extends ComponentEditPolicy {
#Override
protected Command createDeleteCommand(GroupRequest deleteRequest) {
DeleteMyNodeCommand nodeDeleteCommand = new DeleteMyNodeCommand((MyNode) getHost().getModel());
return nodeDeleteCommand;
}
}
DeleteMyNodeCommand
public class DeleteMyNodeCommand extends Command {
public DeleteMyNodeCommand(MyNode model) {
this.node = model;
this.graph = node.getDiagram();
}
#Override public void execute() {
getMyNode().setDiagram(null);
System.out.println("Is the model still present in the graph? " + getGraph().getMyNodes().contains(getMyNode()));
// Returns false, i.e., graph doesn't contain model object at this point!
}
#Override public void undo() {
getMyNode().setDiagram(getGraph());
}
}
EDIT
Re execc's comment: Yes, refreshChildren() is being called. I've tested this by overriding it and adding a simple System.err line, which is being displayed on the console on deletion of a node:
#Override
public void refreshChildren() {
super.refreshChildren();
System.err.println("refreshChildren() IS being called!");
}
EDIT 2
The funny (well...) thing is, when I close the editor and persist the model, then re-open the same file, the node isn't painted anymore, and is not present in the model. But what does this mean? Am I working on a stale model? Or is refreshing/getting the model children not working properly?
EDIT 3
I've just found a peculiar thing, which might explain the isues I have? In the getModelChildren() method I call allModelObjects.addAll(((Diagram) getModel()).getMyNodes());, and getMyNodes() returns an unmodifiable EList. I found out when I tried to do something along the lines of ((Diagram) getModel()).getMyNodes().remove(getMyNode()) in the delete command, and it threw an UnsupportedOperationException... Hm.
EDIT 4
Er, somebody kill me please?
I've double-checked whether I'm handling the same Diagram object at all times, and while doing this I stumbled across a very embarassing thing:
The getModelChildren() method in DiagramEditPart in the last version read approx. like this:
#Override protected List<EObject> getModelChildren() {
List<EObject> allModelObjects = new ArrayList<EObject>();
EList<MyNode> nodes = ((Diagram) getModel()).getMyNodes();
for (MyNode node : nodes) {
if (node.getDiagram() != null); // ### D'Uh! ###
allModelObjects.add(node);
}
return allModelObjects;
}
I'd like to apologize for stealing everyone's time! Your suggestions were very helpful, and indeed helped my to finally track down the bug!
I've also learned a number of lessons, amongst them: Always paste the original code, over-simplifaction may cloak your bugs! And I've learned a lot about EMF, Adapter, and GEF. Still:
There is one semi-colon too many in line 5 of the following part of the code, namely after the if statement: if (node.getDiagram() != null);:
1 #Override protected List<EObject> getModelChildren() {
2 List<EObject> allModelObjects = new ArrayList<EObject>();
3 EList<MyNode> nodes = ((Diagram) getModel()).getMyNodes();
4 for (MyNode node : nodes) {
5 if (node.getDiagram() != null);
6 allModelObjects.add(node);
7 }
8 return allModelObjects;
9 }