I want to create a GWT application. That whenever the user gets logged in to system, it will show some information in PopUpPanel and after some time it gets disabled automatically.Is it possible with GWT ?
Could try something like:
Timer t = new Timer() {
#Override
public void run() {
popUpPanel.hide();
}
};
popUpPanel.show();
t.schedule(5000);
Where 5000 is how long you want to show the pop up for.
Related
I have a org.apache.wicket.markup.html.panel.FeedbackPanel in my panelA class. The feedback panel is instantiated in a panelA constructor with one message to display -> feedbackPanel.info("displayFirstTime"). I am navigating to a new page and later to the previous panelA with a command
target.getPage().get(BasePage.CONTENT_PANEL_ID).replaceWith(panelA);
but the message "displayFirstTime" won't be displayed on the feedback panel again.
I have made it with overriding a panel onBeforeRender method
#Override
public void onBeforeRender() {
super.onBeforeRender();
if (again_displayCondition) {
this.info("displayFirstTime");
}
}
but it's not a clean solution.
Is it possible or how to make it, that when moving to a panelA page for the 2nd time the feedback message will be also displayed ?
Wicket uses application.getApplicationSettings().getFeedbackMessageCleanupFilter() to delete the feedback messages at the end of the request cycle.
By default it will delete all already rendered messages.
You can setup a custom cleanup filter that may leave some of the messages, e.g. if they implement some interface. For example:
component.info(new DoNotDeleteMe("The actual message here."));
and your filter will have to check:
#Override
public boolean accept(FeedbackMessage message)
{
if (message.getMessage() instanceOf DoNotDeleteMe) {
return false;
}
return message.isRendered();
}
Make sure you implement DoNotDeleteMe#toString() so that it renders properly. Or you will have to use a custom FeedbackPanel too.
DoNotDeleteMe must implement java.io.Serializable!
new to android and I don't know how to display a View after some time. I don't want codes, just want some guidance or resources so I can learn. Already googled it in vain.
You should use handler to post in UI thread . Then set time using postDelayed method of Handler class .
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
//Set the text in your textview here
}
}, TIME_IN_MILLISECONDS);
My problem is with how to stop firing unrelated event of event bus. as I got this solution for Dialog box.
but it does not work in case of where one instance already initialize and try to create new instance of same class.
Just example: A below scroll panel has handler initialized. it used for document preview.
class TestScroll extends ScrollPanel
{
public TestScroll(){
}
implemented onload()
{
// eventBus.addHandler code here.
//here some preview related code
}
unload() method
{
//eventBus remove handler code
}
}
This preview has some data which contains some links that open different preview but with same class and different data structure,
Now The problem is like onUnload ( which contains code of remove handler) event does not load , because other panel opened. that does not mean previous panel unload.
So in that case, twice event handler registered. when one event fired then other event also fired.
Due to that, Preview 1 data shows properly, but after that Preview2 opened and when I close it, I find Preview1=Preview2.
so how can I handle such situation?
As per no of instance created each event fired. but I have to check some unique document id with if condition in event itself.
is there any other ways to stop unrelated event firing?
Edit:
public class Gwteventbus implements EntryPoint {
int i=0;
#Override
public void onModuleLoad() {
TestApp panel=new TestApp();
Button button=new Button("Test Event");
button.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
TestApp panel=new TestApp();
int j=i;
new AppUtils().EVENT_BUS.fireEventFromSource(new AuthenticationEvent(),""+(j));
i++;
}
});
panel.add(button);
RootPanel.get().add(panel);
}
}
public class AppUtils {
public static EventBus EVENT_BUS = GWT.create(SimpleEventBus.class);
}
public class TestApp extends VerticalPanel{
String testString="";
public TestApp( ) {
AppUtils.EVENT_BUS.addHandler(AuthenticationEvent.TYPE, new AuthenticationEventHandler() {
#Override
public void onAuthenticationChanged(AuthenticationEvent authenticationEvent) {
System.out.println("helloworld"+authenticationEvent.getSource());
}
});
}
}
These are wild guesses as it's difficult to really answer it without code and a clear description.
I'm guessing you have one eventbus for all the panels. So when you register a handler it is registered with that one eventbus. In case you fire an event from one of the panels to the eventbus all panels will receive the event.
To fix this you can either create a new eventbus per panel or check who fired the event with event.getSource().
If this doesn't make sense you probably are reusing a variable or use a static variable which actually should be a new instance or none static variable.
You can use the GwtEventService-Library to fire specific events over a unique domain and every receiver that is registered at this domain receives that events then. You can handle as many different events/domains as you want.
In order to remove a handler attached to the EventBus, you must first store a reference to the HandlerRegistration returned by the addHandler method:
HandlerRegistration hr = eventBus.addHandler(new ClickHandler(){...});
Then you can remove the handler with the removeHandler method:
hr.removeHandler();
A final note worth mentioning is that when using singleton views, like is typical with MVP and GWT Activities and Places, it is best practice to make use of a ResettableEventBus. The eventBus passed to an activity's start() is just such a bus. When the ActivityManager stops the activity, it automatically removes all handlers attached to the ResettableEventBus.
I would strongly recommend reading the GWT Project's documentation on:
Activities and Places
Large scale application development and MVP
In GWT I want to handle the click event, but only when user clicks on a day.
There's a valueChangeHandler but it fires when value change, so when I click two times at the same day it will fire once.
Other option is to use addHandler or addDomHandler in which I can add ClickHandler, but it fires always, no matter if I click a day or if I pass to other month.
Both options for me are not functional.
Any ideas how to do it?
Use the addvalueChangeHandler then after that set the value to something else. It's a hack but it works for me.
calendarWidget.addValueChangeHandler(new ValueChangeHandler<Date>() {
#Override
public void onValueChange(ValueChangeEvent<Date> event) {
calendarWidget.setValue(new Date(0));
}
}
Firstly , you should describe more details . I don't know exactly what you really want to do.
Here my advices.
(1). Use Cookies to save infomation of current used user and set expire day to 1day.
(2). Don't use addNewHandler. You should use global variable of one handler instance and initialize it to NULL . At first tought to this , you would be initialized it. That may creat only one time and you can check is it NULL . eg:
private CloseHandler handler;
.......
if (handler == null) {
handler = new CloseHandler<PopupPanel>() {
public void onClose(final CloseEvent<PopupPanel> event) {
........
}
};
}
(3). You can also use simple handler as you with and if fired event to it , save in a Map with current time and unique value (eg:sequence of login user.etc). When after hit it again , you retrive and match the times of both current and previous.
Be useful for you..
You can also add handler on your DateBox.getDatePicker() and your DateBox.getTextBox().
You can add another handlers as like this...
dateBox.addHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
Window.alert("click");
}
}, ClickEvent.getType());
I have created a Dialog with two buttons Yes, No, and then I have add action listener to them, my problem is that I want no button to hide the Dialog that I have created
the code is looks like:
dialog = new Dialog(title);
dialog.setDialogType(Dialog.TYPE_CONFIRMATION);
ta = new TextArea(text);
ta.getStyle().setBorder(Border.createEmpty());
ta.setEditable(false);
yesCommand = new Button("YES");
noCommand = new Button("NO");
yesCommand.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
LGBMainMidlet.getLGBMidlet().notifyDestroyed();
}
});
noCommand.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
Logger.Log("Bye Bye");
dialog = null;
System.gc();
}
});
dialog.addComponent(ta);
dialog.addComponent(yesCommand);
dialog.addComponent(noCommand);
dialog.show();
the code is not working for me, can anyone told me what is the problem?
B.N. I have used dialog.dispose(), but it exit the whole application
It is better to use
dialog.setTimeout(1000); the number show the time limit the dialog box wait in milliseconds. So by doing this you can exit the dialog form automatically.
Dialog.dispose() does not exit the whole application, it just closes the dialog.
If you have nothing in your application you might see nothing if you dispose the dialog.