Please add means to list tabs in TabBarView

[vaadin-bot]

Originally by mvysny2

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I know that the user can track the list of opened tabs externally, yet I think it would be nice to have the tracking built-in in the TabBarView. I augmented the TabBarView with methods I have found useful, please feel free to include it in TabBarView if you agree:

public class MyTabBar extends TabBarView {
    @NotNull
    private final List<TabSheet.Tab> tabs = new ArrayList<>();

    @Override
    public TabSheet.Tab addTab(Component tabContent, String caption, Resource icon) {
        final TabSheet.Tab tab = super.addTab(tabContent, caption, icon);
        tabs.add(tab);
        return tab;
    }

    /**
     - Returns all tabs present in this tab bar.
     - @return the list of tabs, not null, may be empty.
     -/
    @NotNull
    public List<TabSheet.Tab> getTabs() {
        return Collections.unmodifiableList(tabs);
    }

    /**
     - Finds the tab by its content component.
     - @param component the component, not null.
     - @return the tab, not null.
     - @throws IllegalArgumentException if there is no such tab.
     -/
    @NotNull
    public TabSheet.Tab getTab(@NotNull Component component) {
        for (TabSheet.Tab tab : getTabs()) {
            if (tab.getComponent() == component) {
                return tab;
            }
        }
        throw new IllegalArgumentException("Parameter component: invalid value " + component + ": no such tab for that component");
    }

    /**
     - Checks if the tab bar has any tabs registered.
     - @return true if there are any tabs present - that is, {@link #getTabs()} returns a non-empty list.
     -/
    public boolean hasTabs() {
        return !getTabs().isEmpty();
    }

    @Override
    public void removeTab(@NotNull Component c) {
        tabs.remove(getTab(c));
        try {
            super.removeTab(c);
        } catch (NoSuchElementException ex) {
            // workaround for https://dev.vaadin.com/ticket/19499#ticket
            if (hasTabs()) {
                setSelectedTab(getTab(0));
            }
        }
    }

    /**
     - Removes all tabs from this tab bar.
     -/
    public void removeAllTabs() {
        for (TabSheet.Tab tab : new ArrayList<>(tabs)) {
            removeTab(tab);
        }
    }

    /**
     - Returns the currently selected tab.
     - @return currently selected tab, null if there are no tabs present (the tab bar is empty).
     -/
    @Nullable
    public TabSheet.Tab getSelectedTab() {
        // workaround for https://dev.vaadin.com/ticket/11711
        return getSelelectedTab();
    }

    /**
     - Selects a tab based on the tab index.
     - @param tabIndex the tab index.
     - @throws IndexOutOfBoundsException if there is no such tab
     -/
    public void setSelectedTab(int tabIndex) {
        setSelectedTab(getTabs().get(tabIndex));
    }

    /**
     - Returns i-th tab.
     - @param tabIndex the tab index.
     - @return i-th tab, not null.
     - @throws IndexOutOfBoundsException if there is no such tab
     -/
    @NotNull
    public TabSheet.Tab getTab(int tabIndex) {
        return getTabs().get(tabIndex);
    }

    @NotNull
    public Component getTabComponent(int tabIndex) {
        return getTab(tabIndex).getComponent();
    }
}

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Imported from https://dev.vaadin.com/ issue #19500