Develop Reference

How to listen on save button or assign an event after it was clicked in Vaadin 7

When I am editing grid inline I can save or cancel my grid row changes. I want to update my database entries after button 'save' will be pushed(Data base mechanism has already done) How can I implement it?
My container:
BeanItemContainer<CategoryOfService> beansContainer;
Editing view:
All what I need it know which listeners I have to use. I found some CommitHandler which I can add by EditorFieldGroup class but I can't implement it properly maybe there is have to be another way to resolve problem.

There's kind of a way to capture inline Save click on the grid.
grid.getEditorFieldGroup().addCommitHandler(new FieldGroup.CommitHandler() {
#Override
public void preCommit(FieldGroup.CommitEvent commitEvent) throws FieldGroup.CommitException {
//...
}
#Override
public void postCommit(FieldGroup.CommitEvent commitEvent) throws FieldGroup.CommitException {
//...
}
});
After clicking Save both methods preCommit and postCommit get called.
Hope it helps :)

Grid does not currently give you any direct way of adding listeners to the save and cancel buttons for the inline editor, although that is something that might change in Vaadin 7.6.
As a workaround before that happens, the CommitHandler approach that you already mentioned is still supposed to work. You can find a basic example here. The contents of your BeanItemContainer should be fully updated in the postCommit phase.

grid.getEditor().addSaveListener((EditorSaveListener<Product>) event -> {
//your stuf
HibernateDataSource.updateProduct(event.getBean());
});

Validate CTabFolder before switching tabs

In a CTabFolder, I'd like to check the content for unsaved data before the user can switch from one tab to another. SWT does not provide a PreSelection event, as stated here.
I found a workaround, suggesting to switch back to the old tab when a selection is triggered, validate the data and then perform the desired switch again, if data is valid.
I do understand the general idea of this workaround, however, it is not working for me. oldPageIndex and newPageIndex do always have the same value, though I did not click on the same tab.
this.tabContainer.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent event) {
int oldPageIndex = tabContainer.getSelectionIndex();
int newPageIndex = tabContainer.indexOf((CTabItem)event.item);
// Here: oldPageIndex == newPageIndex
...
}
});
Is this workaround still working or is there anything I could possibly be doing wrong? Or maybe, has there been any fix for a real PreSelection event in the meantime? I tried using event.doit, but the SelectionEvent is fired, when the tabs have been switched already.

You can use the selection listener but as you have found the getSelectionIndex() does not give you the old tab. So you will have to maintain the old tab index yourself.
This is the technique used by the Eclipse FormEditor.

Showing combo box when a specific selection occurs

I am coding a bookshop in Java and have a problem with when a new book is ordered I want the user to select whether it is a ebook or paper book. If it is an ebook I want another combo box to show on the page with called cboFormat. I have some code but it doesn't seem to work.
This is in the constructor.
if("Ebook".equals(cboBookType.getSelectedItem()))
{
cboFormat.enable();
}
else
{
cboFormat.disable();
}
Why doesn't this work? I have also previously set the format input to disabled.

This could be that you do not have a actionlistener on your combo box ? As Andrew suggested, there could be more reasons why your block does not work. If you pasted more code it would be easier to determine what the problem is. If however you are missing action listener on your combo box, code below.
public void actionPerformed(ActionEvent e) {
JComboBox cboBookType = (JComboBox)e.getSource();
String bookType= (String)cboBookType.getSelectedItem();
//and paste your ifs here
if("Ebook".equals.....){
...
}
... rest of code
}
And if you don't know what action listener is, its basically interface used by other classes to listen for an action event. i.e. user clicking button, or user selecting checkbox etc.

Dont use enable and disable try this and dont put it in the constructor because then it wont get updated you have to make a new event like itemchanged or itemstatechanged i dont know it exactly
if("Ebook".equals(cboBookType.getSelectedItem()))
{
cboFormat.setvisible(true);
}
else
{
cboFormat.setvisible(false);
}

Eclipse RCP view will not update when editor data is modified

I'm attempting to do something that seems like it should be quite common, so I'm surprised I'm having a hard time finding a solution.
I have a simple Eclipse RCP application. It consists of a view, containing a treeViewer that displays elements of an xml file hierarchically. The other side is an editor, which contains various fields such as textboxes, etc, for displaying and also modifying the xml values. The treeviewer displays icons alongside the element name, and what I'm trying to do is change the icon to a "modified" version of the icon whenever a change is made in the editor - signifying that a value of that element has been changed. This is very similar to how Eclipse, when integrated with subversion, shows that a file has been modified from the base revision in the Package Explorer.
I'll try to just show the parts of the code relevant to this specific issue and hope I don't leave anything out. This is the editor class:
public class XmlEditor extends EditorPart
{
protected boolean dirty = false;
public void setDirty(boolean value)
{
dirty = value;
firePropertyChange(PROP_DIRTY);
}
}
and this is the view with the tree:
public class TreeView extends ViewPart implements IPropertyChangeListener {
public void createPartControl(Composite parent) {
treeViewer = new TreeViewer(parent, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL);
getSite().setSelectionProvider(treeViewer);
treeViewer.setLabelProvider(new TreeObjLabelProvider());
treeViewer.setContentProvider(new TreeObjContentProvider());
PlatformUI.getWorkbench().getWorkingSetManager().addPropertyChangeListener(this);
}
public void propertyChange(PropertyChangeEvent event) {
if (event.getProperty().equals(IWorkbenchPartConstants.PROP_DIRTY)) {
treeViewer.refresh();
}
}
}
In this scenario, TreeView::propertyChange() is not getting called, even though firePropertyChange() is getting fired. Any ideas why? I'm also open to any other ideas that don't involve PropertyChangeListener, it just seemed like this would be the easiest way at the time. Thank you.

Here's how I ended up solving the problem:
Changed TreeView to implement IPropertyListener instead of IPropertyChangeListener
Implemented the propertyChanged() method to perform a treeViewer.refresh()
In the XmlEditor::createPartControl() method I got a reference to the Treeview part and then added it to the property listeners like so:
TreeView treeView = (TreeView) getSite().getPage().findView(TreeView.ID);
addPropertyListener(treeView);
Now, TreeView::propertyChanged() gets called after firePropertyChanged(), just like I needed. It took quite a bit of experimentation to learn the difference between IPropertyListener and IPropertyChangeListener, addPropertyListener() and addPartPropertyListener().
Thanks to nitind for giving me a new perspective, and for showing me about Decorators, which is definitely the right way to go as opposed to changing the tree icon to a modified version.

You fired a property change in the editor part, which is unrelated to the working set manager. Nothing you've done connects the view to the editor. If you want the two to talk to each other, write them to talk to each other, or at least create and react to events from making the modifications you describe.
I'm also pretty certain that's not how SVN shows that a file has been modified.
SVN is probably supplying a Decorator: http://eclipse.org/articles/Article-Decorators/decorators.html

Add this bunch of code in your create part control this will may be help you
ResourcesPlugin.getWorkspace().addResourceChangeListener(new IResourceChangeListener() {
#Override
public void resourceChanged(IResourceChangeEvent event) {
treeViewer.refresh();
}
});

eclipse listener for main menu bar selections

i am trying to capture user selections from the menu bar , for example if the user pressed File in the menu, my plug-in gonna print "File pressed".
i figured out how to listen to view selections by IselectionService , but still has no clue how to do it with the main menu bars(or toolbars).
thanx for help
More details :
I gonna explain my problem a little bit more precisely :
I would like capture top-level menus actions and toolbar, the problem is I really don't know how to create and attach the listener.
Here is the ISelectionListener of the plugin.
My purpose is to listen to the workbench top-level menu selections and toolbar.
Thanx for help
// the listener we register with the selection service
private ISelectionListener listener = new ISelectionListener() {
public void selectionChanged(IWorkbenchPart sourcepart, ISelection selection) {
// we ignore our own selections
if (sourcepart != SelectionView.this) {
showSelection(sourcepart, selection);
}
}
};
...
...
public void createPartControl(Composite parent) {
...
getSite().getWorkbenchWindow().getSelectionService().addSelectionListener(listener);
P.S : Most what I found about menu listener were SWT stuff for some view or windows I had created, thats not what I meant, I need listener to the main top level menu and toolbars in eclipse workbench.

If you know the location uri (which you can check with a PluginSpy), you can add an handler in order to react to that menu event.
Note: The Menu Contribution article mentions the locationURI for:
main menu is "org.eclipse.ui.main.menu"
main toolbor is "org.eclipse.ui.main.toolbar"

Yuo could try to use the ICommandService:
with this service you can register an IExecutionListener.
This way you can track all the commands wich are executed but I'm afraid that this way you can't track the menu item that activated the command itself.
Hope it helps

i just wanna tell you i got some help from guys who made Smarttutor plugin, which excatly what i need. captures all the actions on the menus. – amir farah 31 secs ago edit i just wanna tell you i got some help from guys who made Smarttutor plugin, which excatly what i need. captures all the actions on the menus.
here is the website:code.google.com/p/smarttutor