5.5.2.4. API of Components
Common

  • unwrap() - returns client-specific component instance (Vaadin or Swing component). Can be used in client module to simplify invocation of underlying API, see Working with Vaadin Components section.

    com.vaadin.ui.TextField vTextField = textField.unwrap(com.vaadin.ui.TextField.class);

  • unwrapComposition() - returns the outmost external container of client-specific component instance. Can be used in client module to simplify invocation of underlying API.

Available for all components.

Component.Buffered

  • commit() - updates all changes made since the previous commit to the data source.

  • discard() - discards all changes since last commit. The object updates its value from the data source.

  • isModified() - returns true if the object value has been modified since it was last updated from the data source.

if (textArea.isModified()) {
    textArea.commit();
}

Available for components:

CheckBox - DateField - FileUploadField - LookupField - LookupPickerField - PickerField - TextArea - TextField - TimeField

Component.Collapsable

  • addExpandedStateChangeListener() - adds the listener implementing the ExpandedStateChangeListener interface to intercept the component’s expanded state change events.

    groupBox.addExpandedStateChangeListener(e ->
        showNotification("Expanded: " + groupBox.isExpanded()));

    Available for components:

Filter - GroupBoxLayout

Component.Container

  • add() - adds child component to the container.

  • remove() - removes the child component from the container.

  • removeAll() - removes all children components from te container.

  • getOwnComponent() - returns the component directly owned by this container.

  • getComponent() - returns the component belonging to the whole components tree below this container.

  • getComponentNN() - returns the component belonging to the whole components tree below this container. Throws an exception if not found.

  • getOwnComponents() - returns all components directly owned by this container.

  • getComponents() - returns all components belonging to the whole components tree below this container.

Available for components:

Accordion - BoxLayout - CssLayout - Frame - GridLayout - GroupBoxLayout - HtmlBoxLayout - ScrollBoxLayout - SplitPanel - TabSheet

Component.OrderedContainer

  • indexOf() - returns the index of a given component in an ordered container.

Available for components:

BoxLayout - CssLayout - Frame - GroupBoxLayout - ScrollBoxLayout -

Component.HasSettings

  • applySettings() - restores the last user settings for this component.

  • saveSettings() - saves current user settings for this component.

Available for components:

DataGrid - Filter - GroupBoxLayout - SplitPanel - Table - TextArea

Component.HasValue

  • addValueChangeListener() - adds the listener implementing the ValueChangeListener interface to intercept the component’s value changes.

    textField.addValueChangeListener(e ->
        showNotification("Before: " + e.getPrevValue() + ". After: " + e.getValue()));

Available for components:

CheckBox - ColorPicker - DateField - DatePicker - FileUploadField - Label - LookupField - LookupPickerField - MaskedField - OptionsGroup - OptionsList - PasswordField - PickerField - ProgressBar - RichTextArea - SearchPickerField - SourceCodeEditor - SuggestionPickerField - TextArea - TextField - TimeField - TokenList - TwinColumn

Component.LayoutClickNotifier

  • addLayoutClickListener() - adds the listener implementing the LayoutClickListener interface to intercept the clicks on the component area.

    vbox.addLayoutClickListener(event ->
                showNotification("Clicked"));

Available for components:

ButtonsPanel - BoxLayout - CssLayout - GridLayout

Component.Margin

  • setMargin() - sets the margins for the component.

    • Sets margins on all sides of the component:

      vbox.setMargin(true);

    • Sets margins only on the top and the bottom of the component:

      vbox.setMargin(true, false, true, false);

    • Creates new instance of MarginInfo configuration class:

      vbox.setMargin(new MarginInfo(true, false, false, true));

  • getMargin() - returns margin configuration as an instance of MarginInfo class.

BoxLayout - Filter - Frame - GridLayout ScrollBoxLayout

Component.ShortcutNotifier

  • addShortcutAction() - adds an action which is triggered when the user presses a given key combination.

    cssLayout.addShortcutAction(new ShortcutAction("SHIFT-A", shortcutTriggeredEvent ->
        showNotification("SHIFT-A action" )));

Available for components:

BoxLayout - ButtonsPanel - CssLayout - GridLayout - GroupBoxLayout - ScrollBoxLayout

Component.Spacing

  • setSpacing() - adds space between the component and its child components.

    vbox.setSpacing(true);

Available for components:

BoxLayout - ButtonsPanel - Frame - GridLayout GroupBoxLayout - ScrollBoxLayout