Examples with ValueChangeHandler com.google.gwt.event.logical.shared.ValueChangeHandler used on opensource projects

Example 1 with ValueChangeHandler

use of com.google.gwt.event.logical.shared.ValueChangeHandler in project rstudio by rstudio.

the class DataImportOptionsUiXls method initEvents.

void initEvents() {
    ValueChangeHandler<String> valueChangeHandler = new ValueChangeHandler<String>() {

        @Override
        public void onValueChange(ValueChangeEvent<String> arg0) {
            triggerChange();
        }
    };
    ChangeHandler changeHandler = new ChangeHandler() {

        @Override
        public void onChange(ChangeEvent arg0) {
            triggerChange();
        }
    };
    ValueChangeHandler<Boolean> booleanValueChangeHandler = new ValueChangeHandler<Boolean>() {

        @Override
        public void onValueChange(ValueChangeEvent<Boolean> arg0) {
            triggerChange();
        }
    };
    nameTextBox_.addValueChangeHandler(valueChangeHandler);
    sheetListBox_.addChangeHandler(changeHandler);
    columnNamesCheckBox_.addValueChangeHandler(booleanValueChangeHandler);
    openDataViewerCheckBox_.addValueChangeHandler(booleanValueChangeHandler);
    naListBox_.addChangeHandler(changeHandler);
    skipTextBox_.addValueChangeHandler(valueChangeHandler);
}

Example 2 with ValueChangeHandler

use of com.google.gwt.event.logical.shared.ValueChangeHandler in project rstudio by rstudio.

the class CodeBrowserEditingTarget method initialize.

@Override
public void initialize(SourceDocument document, FileSystemContext fileContext, FileType type, Provider<String> defaultNameProvider) {
    doc_ = document;
    codeExecution_ = new EditingTargetCodeExecution(docDisplay_, getId());
    view_ = new CodeBrowserEditingTargetWidget(commands_, globalDisplay_, events_, server_, docDisplay_);
    TextEditingTarget.registerPrefs(releaseOnDismiss_, prefs_, docDisplay_, document);
    TextEditingTarget.syncFontSize(releaseOnDismiss_, events_, view_, fontSizeManager_);
    releaseOnDismiss_.add(prefs_.softWrapRFiles().addValueChangeHandler(new ValueChangeHandler<Boolean>() {

        public void onValueChange(ValueChangeEvent<Boolean> evt) {
            view_.adaptToFileType(FileTypeRegistry.R);
        }
    }));
    // if we have contents then set them
    CodeBrowserContents contents = getContents();
    if (contents.getContext().length() > 0) {
        ensureContext(contents.getContext(), new Command() {

            @Override
            public void execute() {
            }
        });
    } else {
        docDisplay_.setCode("", false);
    }
}

Example 3 with ValueChangeHandler

use of com.google.gwt.event.logical.shared.ValueChangeHandler in project gwt-test-utils by gwt-test-utils.

the class UiBinderInvocationHandler method addHandlers.

@SuppressWarnings("unchecked")
private <H extends EventHandler> void addHandlers(Object owner) {
    Map<Method, UiHandler> uiHandlerMethods = GwtReflectionUtils.getAnnotatedMethod(owner.getClass(), UiHandler.class);
    for (Map.Entry<Method, UiHandler> entry : uiHandlerMethods.entrySet()) {
        for (String uiFieldName : entry.getValue().value()) {
            Widget uiField = GwtReflectionUtils.getPrivateFieldValue(owner, uiFieldName);
            GwtEvent.Type<H> eventType = (GwtEvent.Type<H>) getEventType(entry.getKey());
            H handler = (H) createHandler(uiField, entry.getKey(), owner);
            if (eventType instanceof DomEvent.Type) {
                uiField.addDomHandler(handler, (DomEvent.Type<H>) eventType);
            } else {
                if (uiField instanceof HasValueChangeHandlers && handler instanceof ValueChangeHandler) {
                    ((HasValueChangeHandlers<Object>) uiField).addValueChangeHandler((ValueChangeHandler<Object>) handler);
                } else {
                    uiField.addHandler(handler, eventType);
                }
            }
        }
    }
}

Example 4 with ValueChangeHandler

use of com.google.gwt.event.logical.shared.ValueChangeHandler in project perun by CESNET.

the class AddMemberToResourceTabItem method draw.

@Override
public Widget draw() {
    this.titleWidget.setText("Add member(s) to resource");
    final TabItem tab = this;
    if (state == State.SELECT_MEMBERS) {
        this.contentWidget.clear();
        session.getTabManager().changeStyleOfInnerTab(true);
        // main tab
        FlexTable hp = new FlexTable();
        hp.setSize("100%", "100%");
        hp.setCellPadding(5);
        // members list
        VerticalPanel membersListPanel = new VerticalPanel();
        membersListPanel.setSize("100%", "100%");
        TabMenu membersListMenu = new TabMenu();
        membersListPanel.add(membersListMenu);
        membersListPanel.setCellHeight(membersListMenu, "30px");
        // members list callback
        final FindCompleteRichMembers findMembers = new FindCompleteRichMembers(PerunEntity.VIRTUAL_ORGANIZATION, voId, "", null);
        membersListMenu.addSearchWidget(new PerunSearchEvent() {

            @Override
            public void searchFor(String text) {
                if (UiElements.searchStingCantBeEmpty(text)) {
                    findMembers.searchFor(text);
                }
            }
        }, ButtonTranslation.INSTANCE.searchMemberInVo());
        final CustomButton addButton = TabMenu.getPredefinedButton(ButtonType.ADD, "Add selected members to list", new ClickHandler() {

            @Override
            public void onClick(ClickEvent clickEvent) {
                ArrayList<RichMember> list = findMembers.getTableSelectedList();
                if (UiElements.cantSaveEmptyListDialogBox(list)) {
                    selectedMembers.addItems(list);
                    findMembers.clearTableSelectedSet();
                }
            }
        });
        membersListMenu.addWidget(addButton);
        membersListMenu.addWidget(TabMenu.getPredefinedButton(ButtonType.CANCEL, "", new ClickHandler() {

            @Override
            public void onClick(ClickEvent clickEvent) {
                session.getTabManager().closeTab(tab);
            }
        }));
        final CustomButton continueButton = TabMenu.getPredefinedButton(ButtonType.CONTINUE, "Continue to resource selection", new ClickHandler() {

            @Override
            public void onClick(ClickEvent clickEvent) {
                // change state
                state = State.SELECT_RESOURCE_OR_FACILITY;
                // redraw the page
                tab.draw();
            }
        });
        membersListMenu.addWidget(continueButton);
        // if no member selected, disable
        if (selectedMembers.getList().size() == 0) {
            continueButton.setEnabled(false);
        }
        // selection of some member will enable continue button
        selectedMembers.setEvents(new AddRemoveItemsTable.HandleItemsAction<RichMember>() {

            @Override
            public void onAdd(RichMember object) {
                continueButton.setEnabled(true);
            }

            @Override
            public void onRemove(RichMember object) {
                if (selectedMembers.getList().size() == 0) {
                    continueButton.setEnabled(false);
                }
            }
        });
        // put table in content
        ScrollPanel tableWrapper = new ScrollPanel();
        tableWrapper.setWidth("100%");
        CellTable<RichMember> table = findMembers.getEmptyTable(new FieldUpdater<RichMember, RichMember>() {

            // when user click on a row -> open new tab
            public void update(int index, RichMember object, RichMember value) {
                session.getTabManager().addTab(new MemberDetailTabItem(object.getId(), 0));
            }
        });
        addButton.setEnabled(false);
        JsonUtils.addTableManagedButton(findMembers, table, addButton);
        table.addStyleName("perun-table");
        table.setWidth("100%");
        tableWrapper.setWidget(table);
        tableWrapper.addStyleName("perun-tableScrollPanel");
        session.getUiElements().resizeSmallTabPanel(tableWrapper, 350, this);
        membersListPanel.add(tableWrapper);
        // selected members
        VerticalPanel selectedMembersPanel = new VerticalPanel();
        selectedMembersPanel.setSize("100%", "100%");
        TabMenu selectedMembersMenu = new TabMenu();
        selectedMembersPanel.add(selectedMembersMenu);
        selectedMembersPanel.setCellHeight(selectedMembersMenu, "30px");
        selectedMembersMenu.addWidget(new HTML("<h3>Selected&nbsp;members:</h3>"));
        selectedMembersPanel.add(selectedMembers);
        hp.setWidget(0, 0, membersListPanel);
        hp.setWidget(0, 1, selectedMembersPanel);
        hp.getFlexCellFormatter().setHorizontalAlignment(0, 1, HasHorizontalAlignment.ALIGN_LEFT);
        hp.getFlexCellFormatter().setWidth(0, 0, "80%");
        hp.getFlexCellFormatter().setWidth(0, 1, "20%");
        this.contentWidget.add(hp);
    } else if (state == State.SELECT_RESOURCE_OR_FACILITY) {
        this.contentWidget.clear();
        session.getTabManager().changeStyleOfInnerTab(false);
        FlexTable layout = new FlexTable();
        layout.setSize("100%", "100%");
        TabMenu menu = new TabMenu();
        if (!startedAtTwo) {
            menu.addWidget(TabMenu.getPredefinedButton(ButtonType.BACK, "Back to members selection", new ClickHandler() {

                @Override
                public void onClick(ClickEvent clickEvent) {
                    // get back and reload
                    state = State.SELECT_MEMBERS;
                    tab.draw();
                }
            }));
        } else {
            this.titleWidget.setText("Add member to resource");
        }
        menu.addWidget(TabMenu.getPredefinedButton(ButtonType.CONTINUE, "", new ClickHandler() {

            @Override
            public void onClick(ClickEvent clickEvent) {
                state = State.SELECT_GROUP;
                tab.draw();
            }
        }));
        // RESOURCE LAYOUT
        FlexTable resourceLayout = new FlexTable();
        resourceLayout.setStyleName("inputFormFlexTable");
        // by default do not choose facility or service
        facilitiesListbox.addNotSelectedOption();
        servicesListbox.addNotSelectedOption();
        // TODO
        servicesListbox.setEnabled(false);
        // fill services event
        final JsonCallbackEvents fillServEvent = new JsonCallbackEvents() {

            @Override
            public void onFinished(JavaScriptObject jso) {
                services.setHTML("");
                ArrayList<Service> servList = JsonUtils.jsoAsList(jso);
                servList = new TableSorter<Service>().sortByName(servList);
                for (Service s : servList) {
                    services.setHTML(services.getHTML().concat(s.getName() + "</br>"));
                }
            }

            @Override
            public void onError(PerunError errro) {
                services.setHTML("Error while loading available services.");
            }
        };
        // fill resources event
        final JsonCallbackEvents fillResEvent = new JsonCallbackEvents() {

            @Override
            public void onFinished(JavaScriptObject jso) {
                // list of VO facilities filled by loaded resources
                ArrayList<Facility> facs = new ArrayList<Facility>();
                ArrayList<RichResource> resList = JsonUtils.jsoAsList(jso);
                resList = new TableSorter<RichResource>().sortByName(resList);
                Set<String> unificator = new HashSet<String>();
                for (RichResource r : resList) {
                    allResources.add(r);
                    resourcesListbox.addItem(r);
                    if (r.getFacility() != null && !unificator.contains(r.getFacility().getName())) {
                        unificator.add(r.getFacility().getName());
                        facs.add(r.getFacility());
                    }
                }
                // sort and fill facilities
                facs = new TableSorter<Facility>().sortByName(facs);
                facilitiesListbox.addAllItems(facs);
                // initial setup
                // refresh rest
                description.setText(resourcesListbox.getSelectedObject().getDescription());
                GetAssignedServices servCall = new GetAssignedServices(resourcesListbox.getSelectedObject().getId(), fillServEvent);
                servCall.retrieveData();
            }

            @Override
            public void onLoadingStart() {
                resourcesListbox.clear();
            }

            @Override
            public void onError(PerunError error) {
                resourcesListbox.addItem("Error while loading");
            }
        };
        resourcesListbox.addChangeHandler(new ChangeHandler() {

            @Override
            public void onChange(ChangeEvent changeEvent) {
                description.setText(resourcesListbox.getSelectedObject().getDescription());
                // fill information about services on resource
                GetAssignedServices servCall = new GetAssignedServices(resourcesListbox.getSelectedObject().getId(), fillServEvent);
                servCall.retrieveData();
            }
        });
        facilitiesListbox.addChangeHandler(new ChangeHandler() {

            @Override
            public void onChange(ChangeEvent changeEvent) {
                if (facilitiesListbox.getSelectedIndex() > 0) {
                    // fill only resources on facility
                    resourcesListbox.clear();
                    for (RichResource r : allResources) {
                        if (r.getFacility().getId() == facilitiesListbox.getSelectedObject().getId()) {
                            resourcesListbox.addItem(r);
                        }
                    }
                } else {
                    // fill all resources
                    resourcesListbox.clear();
                    resourcesListbox.addAllItems(allResources);
                }
                // refresh rest
                description.setText(resourcesListbox.getSelectedObject().getDescription());
                GetAssignedServices servCall = new GetAssignedServices(resourcesListbox.getSelectedObject().getId(), fillServEvent);
                servCall.retrieveData();
            }
        });
        GetRichResources resCall = new GetRichResources(voId, fillResEvent);
        if (allResources.isEmpty()) {
            resCall.retrieveData();
        }
        resourceLayout.setHTML(0, 0, "Filter by Facility:");
        resourceLayout.setWidget(0, 1, facilitiesListbox);
        //resourceLayout.setHTML(1, 0, "Filter by Service:");
        //resourceLayout.setWidget(1, 1, servicesListbox);
        resourceLayout.setHTML(1, 0, "Selected resource:");
        resourceLayout.setWidget(1, 1, resourcesListbox);
        resourceLayout.setHTML(2, 0, "Description:");
        resourceLayout.setWidget(2, 1, description);
        resourceLayout.setHTML(3, 0, "Services on Resource:");
        resourceLayout.setWidget(3, 1, services);
        for (int i = 0; i < resourceLayout.getRowCount(); i++) {
            resourceLayout.getFlexCellFormatter().addStyleName(i, 0, "itemName");
        }
        // set layout
        layout.setWidget(0, 0, menu);
        layout.setWidget(1, 0, resourceLayout);
        this.contentWidget.add(layout);
    } else if (state == State.SELECT_GROUP) {
        this.contentWidget.clear();
        session.getTabManager().changeStyleOfInnerTab(true);
        final GetAssignedGroups assGroupCall = new GetAssignedGroups(resourcesListbox.getSelectedObject().getId());
        assGroupCall.setSingleSelection(true);
        assGroupCall.setCoreGroupsCheckable(false);
        VerticalPanel vp = new VerticalPanel();
        vp.setSize("100%", "100%");
        TabMenu menu = new TabMenu();
        menu.addWidget(TabMenu.getPredefinedButton(ButtonType.BACK, "Back to resource selection", new ClickHandler() {

            @Override
            public void onClick(ClickEvent clickEvent) {
                // get back and reload
                state = State.SELECT_RESOURCE_OR_FACILITY;
                tab.draw();
            }
        }));
        final CustomButton addToGroupButton = new CustomButton("Add to Group", "Add members to selected Group", SmallIcons.INSTANCE.addIcon());
        menu.addWidget(addToGroupButton);
        addToGroupButton.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent clickEvent) {
                if (UiElements.cantSaveEmptyListDialogBox(assGroupCall.getTableSelectedList())) {
                    final Group grp = assGroupCall.getTableSelectedList().get(0);
                    final FlexTable content = new FlexTable();
                    GetAssignedResources getRes = new GetAssignedResources(grp.getId(), PerunEntity.GROUP, new JsonCallbackEvents() {

                        @Override
                        public void onFinished(JavaScriptObject jso) {
                            ArrayList<Resource> rr = JsonUtils.jsoAsList(jso);
                            String items = new String("<ul>");
                            for (Resource r : rr) {
                                items += "<li>" + r.getName() + "</li>";
                            }
                            items += "</ul>";
                            ScrollPanel sp = new ScrollPanel();
                            sp.add(new HTML(items));
                            sp.setSize("300px", "150px");
                            content.setWidget(1, 0, sp);
                        }

                        public void onError(PerunError error) {
                            content.setWidget(1, 0, new AjaxLoaderImage().loadingError(error));
                        }
                    });
                    getRes.retrieveData();
                    content.setHTML(0, 0, "<p><strong>By adding member into this group, he/she will gain access to following resources:</strong>");
                    content.setWidget(1, 0, new AjaxLoaderImage().loadingStart());
                    Confirm c = new Confirm("Confirm add action", content, new ClickHandler() {

                        @Override
                        public void onClick(ClickEvent clickEvent) {
                            AddMember request = new AddMember(JsonCallbackEvents.disableButtonEvents(addToGroupButton));
                            for (RichMember m : selectedMembers.getList()) {
                                request.addMemberToGroup(grp, m);
                            }
                        }
                    }, true);
                    c.setNonScrollable(true);
                    c.show();
                }
            }
        });
        menu.addWidget(new CustomButton("Create group…", "Create new empty group", SmallIcons.INSTANCE.addIcon(), new ClickHandler() {

            @Override
            public void onClick(ClickEvent clickEvent) {
                // get back and reload
                state = State.CREATE_GROUP;
                tab.draw();
            }
        }));
        CustomButton finish = TabMenu.getPredefinedButton(ButtonType.FINISH, "Close the tab", new ClickHandler() {

            @Override
            public void onClick(ClickEvent clickEvent) {
                session.getTabManager().closeTab(tab, false);
            }
        });
        finish.setImageAlign(true);
        menu.addWidget(finish);
        menu.addWidget(new Image(SmallIcons.INSTANCE.helpIcon()));
        menu.addWidget(new HTML("<strong>Please select group in which you wish to add members to."));
        CellTable<Group> table = assGroupCall.getTable();
        addToGroupButton.setEnabled(false);
        JsonUtils.addTableManagedButton(assGroupCall, table, addToGroupButton);
        // add a class to the table and wrap it into scroll panel
        table.addStyleName("perun-table");
        ScrollPanel sp = new ScrollPanel(table);
        sp.addStyleName("perun-tableScrollPanel");
        session.getUiElements().resizeSmallTabPanel(sp, 350, this);
        vp.add(menu);
        vp.add(sp);
        this.contentWidget.add(vp);
    } else if (state == State.CREATE_GROUP) {
        session.getTabManager().changeStyleOfInnerTab(false);
        VerticalPanel vp = new VerticalPanel();
        // form inputs
        final ExtendedTextBox groupNameTextBox = new ExtendedTextBox();
        final TextBox groupDescriptionTextBox = new TextBox();
        final ListBoxWithObjects<Group> vosGroups = new ListBoxWithObjects<Group>();
        vosGroups.setVisible(false);
        final CheckBox asSubGroup = new CheckBox("", false);
        cz.metacentrum.perun.webgui.widgets.TabMenu menu = new cz.metacentrum.perun.webgui.widgets.TabMenu();
        final CustomButton createButton = TabMenu.getPredefinedButton(ButtonType.CREATE, "");
        final CustomButton cancelButton = TabMenu.getPredefinedButton(ButtonType.CANCEL, "");
        final HTML parentGroupText = new HTML("Parent group:");
        parentGroupText.setVisible(false);
        final ExtendedTextBox.TextBoxValidator validator = new ExtendedTextBox.TextBoxValidator() {

            @Override
            public boolean validateTextBox() {
                if (groupNameTextBox.getTextBox().getText().trim().isEmpty()) {
                    groupNameTextBox.setError("Name can't be empty.");
                } else if (!groupNameTextBox.getTextBox().getText().trim().matches(Utils.GROUP_SHORT_NAME_MATCHER)) {
                    groupNameTextBox.setError("Name can contain only letters, numbers, spaces, dots, '_' and '-'.");
                } else {
                    groupNameTextBox.setOk();
                    return true;
                }
                return false;
            }
        };
        groupNameTextBox.setValidator(validator);
        final GetAllGroups groupsCall = new GetAllGroups(voId, new JsonCallbackEvents() {

            public void onFinished(JavaScriptObject jso) {
                vosGroups.clear();
                ArrayList<Group> retGroups = JsonUtils.jsoAsList(jso);
                retGroups = new TableSorter<Group>().sortByName(retGroups);
                for (Group g : retGroups) {
                    if (g.isCoreGroup()) {
                        // SKIP CORE GROUPS !!
                        continue;
                    }
                    vosGroups.addItem(g);
                }
                createButton.setEnabled(true);
            }

            public void onLoadingStart() {
                vosGroups.clear();
                vosGroups.addItem("Loading...");
                createButton.setEnabled(false);
            }

            public void onError(PerunError error) {
                vosGroups.clear();
                vosGroups.addItem("Error while loading");
                if (asSubGroup.getValue()) {
                    createButton.setEnabled(false);
                } else {
                    createButton.setEnabled(true);
                }
            }
        });
        asSubGroup.addValueChangeHandler(new ValueChangeHandler<Boolean>() {

            @Override
            public void onValueChange(ValueChangeEvent<Boolean> booleanValueChangeEvent) {
                if (booleanValueChangeEvent.getValue() == true) {
                    // set title
                    vosGroups.setVisible(true);
                    parentGroupText.setVisible(true);
                    groupsCall.retrieveData();
                    createButton.setTitle(ButtonTranslation.INSTANCE.createSubGroup());
                } else {
                    createButton.setEnabled(true);
                    vosGroups.setVisible(false);
                    parentGroupText.setVisible(false);
                    createButton.setTitle(ButtonTranslation.INSTANCE.createGroup());
                }
            }
        });
        // layout
        FlexTable layout = new FlexTable();
        layout.setStyleName("inputFormFlexTable");
        FlexTable.FlexCellFormatter cellFormatter = layout.getFlexCellFormatter();
        // send button
        createButton.addClickHandler(new ClickHandler() {

            public void onClick(ClickEvent event) {
                if (!validator.validateTextBox())
                    return;
                // redirect event
                final JsonCallbackEvents redirectEvent = new JsonCallbackEvents() {

                    @Override
                    public void onFinished(JavaScriptObject jso) {
                        state = State.SELECT_GROUP;
                        session.getTabManager().changeStyleOfInnerTab(true);
                        tab.draw();
                    }
                };
                // assign group after creation
                final JsonCallbackEvents assignEvent = new JsonCallbackEvents() {

                    @Override
                    public void onFinished(JavaScriptObject jso) {
                        Group g = jso.cast();
                        if (g != null) {
                            AssignGroupToResources assign = new AssignGroupToResources(JsonCallbackEvents.disableButtonEvents(createButton, redirectEvent));
                            assign.assignGroupToResources(g, JsonUtils.<RichResource>toList(resourcesListbox.getSelectedObject()));
                        }
                    }
                };
                // creates a new request
                CreateGroup cg = new CreateGroup(JsonCallbackEvents.disableButtonEvents(createButton, assignEvent));
                if (asSubGroup.getValue()) {
                    if (vosGroups.getSelectedObject() != null) {
                        cg.createGroupInGroup(vosGroups.getSelectedObject().getId(), groupNameTextBox.getTextBox().getText().trim(), groupDescriptionTextBox.getText());
                    } else {
                        UiElements.generateInfo("No parent group selected", "You checked create this group as sub-group, but no parent group is selected. Please select parent group.");
                    }
                } else {
                    cg.createGroupInVo(voId, groupNameTextBox.getTextBox().getText().trim(), groupDescriptionTextBox.getText());
                }
            }
        });
        // cancel button
        cancelButton.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent clickEvent) {
                // redirect back to select group
                state = State.SELECT_GROUP;
                session.getTabManager().changeStyleOfInnerTab(true);
                tab.draw();
            }
        });
        // Add some standard form options
        layout.setHTML(0, 0, "Name:");
        layout.setWidget(0, 1, groupNameTextBox);
        layout.setHTML(1, 0, "Description:");
        layout.setWidget(1, 1, groupDescriptionTextBox);
        layout.setHTML(2, 0, "As sub-group:");
        layout.setWidget(2, 1, asSubGroup);
        layout.setWidget(3, 0, parentGroupText);
        layout.setWidget(3, 1, vosGroups);
        for (int i = 0; i < layout.getRowCount(); i++) {
            cellFormatter.addStyleName(i, 0, "itemName");
        }
        // button align
        menu.addWidget(createButton);
        menu.addWidget(cancelButton);
        vp.add(layout);
        vp.add(menu);
        vp.setCellHorizontalAlignment(menu, HasHorizontalAlignment.ALIGN_RIGHT);
        this.contentWidget.setWidget(vp);
    }
    return getWidget();
}

Example 5 with ValueChangeHandler

use of com.google.gwt.event.logical.shared.ValueChangeHandler in project perun by CESNET.

the class GroupRelationsTabItem method draw.

@Override
public Widget draw() {
    titleWidget.setText(Utils.getStrippedStringWithEllipsis(group.getName()) + ": unions");
    // main panel
    VerticalPanel vp = new VerticalPanel();
    vp.setSize("100%", "100%");
    // if members group, hide
    if (group.isCoreGroup()) {
        vp.add(new HTML("<h2>Members group cannot have unions.</h2>"));
        this.contentWidget.setWidget(vp);
        return getWidget();
    }
    final GetGroupUnions unions = new GetGroupUnions(group, false);
    // Events for reloading when group is created
    final JsonCallbackEvents events = JsonCallbackEvents.refreshTableEvents(unions);
    // menu
    TabMenu menu = new TabMenu();
    final CheckBox subGroupsCheckBox = new CheckBox("Show sub-groups");
    final ListBox reverseDropdown = new ListBox();
    reverseDropdown.addItem("Normal");
    reverseDropdown.addItem("Reverse");
    reverseDropdown.addChangeHandler(new ChangeHandler() {

        @Override
        public void onChange(ChangeEvent changeEvent) {
            switch(reverseDropdown.getSelectedIndex()) {
                case 1:
                    unions.setReverseAndRefresh(true);
                    subGroupsCheckBox.setVisible(false);
                    break;
                default:
                    unions.setReverseAndRefresh(false);
                    subGroupsCheckBox.setVisible(true);
            }
        }
    });
    menu.addWidget(UiElements.getRefreshButton(this));
    CustomButton createButton = TabMenu.getPredefinedButton(ButtonType.ADD, true, ButtonTranslation.INSTANCE.addGroupUnion(), new ClickHandler() {

        public void onClick(ClickEvent event) {
            // creates a new form
            session.getTabManager().addTabToCurrentTab(new AddGroupUnionTabItem(group), true);
        }
    });
    if (!session.isGroupAdmin(groupId) && !session.isVoAdmin(group.getVoId())) {
        createButton.setEnabled(false);
        unions.setCheckable(false);
    }
    menu.addWidget(createButton);
    final CustomButton removeButton = TabMenu.getPredefinedButton(ButtonType.REMOVE, ButtonTranslation.INSTANCE.removeGroupUnion());
    removeButton.addClickHandler(new ClickHandler() {

        @Override
        public void onClick(ClickEvent event) {
            final ArrayList<Group> itemsToRemove = unions.getTableSelectedList();
            String text = "Following group unions will be deleted.";
            UiElements.showDeleteConfirm(itemsToRemove, text, new ClickHandler() {

                @Override
                public void onClick(ClickEvent clickEvent) {
                    RemoveGroupUnions request = new RemoveGroupUnions(JsonCallbackEvents.disableButtonEvents(removeButton, events));
                    if (unions.isReverse()) {
                        request.deleteGroupUnions(itemsToRemove, group);
                    } else {
                        request.deleteGroupUnions(group, itemsToRemove);
                    }
                }
            });
        }
    });
    menu.addWidget(removeButton);
    // filter box
    final ExtendedSuggestBox box = new ExtendedSuggestBox(unions.getOracle());
    menu.addFilterWidget(box, new PerunSearchEvent() {

        public void searchFor(String text) {
            unions.filterTable(text);
        }
    }, ButtonTranslation.INSTANCE.filterGroup());
    subGroupsCheckBox.addValueChangeHandler(new ValueChangeHandler<Boolean>() {

        @Override
        public void onValueChange(ValueChangeEvent<Boolean> valueChangeEvent) {
            unions.setShowSubgroupsAndRefresh(valueChangeEvent.getValue(), box.getSuggestBox().getText());
        }
    });
    menu.addWidget(new HTML("<strong>Direction: </strong>"));
    menu.addWidget(reverseDropdown);
    menu.addWidget(subGroupsCheckBox);
    // add menu to the main panel
    vp.add(menu);
    vp.setCellHeight(menu, "30px");
    CellTable<Group> table = unions.getTable(new FieldUpdater<Group, String>() {

        @Override
        public void update(int arg0, Group group, String arg2) {
            if (session.isGroupAdmin(group.getId()) || session.isVoAdmin(group.getId())) {
                session.getTabManager().addTab(new GroupDetailTabItem(group.getId()));
            } else {
                UiElements.generateInfo("Not privileged", "You are not manager of selected group or its VO.");
            }
        }
    });
    removeButton.setEnabled(false);
    if (session.isGroupAdmin(groupId) || session.isVoAdmin(group.getVoId()))
        JsonUtils.addTableManagedButton(unions, table, removeButton);
    // adds the table into the panel
    table.addStyleName("perun-table");
    ScrollPanel sp = new ScrollPanel(table);
    sp.addStyleName("perun-tableScrollPanel");
    vp.add(sp);
    session.getUiElements().resizePerunTable(sp, 350, this);
    this.contentWidget.setWidget(vp);
    return getWidget();
}