5.5.2.4. API of Components
- Common
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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);
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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.
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- Component.Buffered
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commit()
- updates all changes made since the previous commit to the data source.
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discard()
- discards all changes since last commit. The object updates its value from the data source.
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isModified()
- returnstrue
if the object value has been modified since it was last updated from the data source.
if (textArea.isModified()) { textArea.commit(); }
Available for components:
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- Component.Collapsable
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addExpandedStateChangeListener()
- adds the listener implementing theExpandedStateChangeListener
interface to intercept the component’s expanded state change events.groupBox.addExpandedStateChangeListener(e -> showNotification("Expanded: " + groupBox.isExpanded()));
Available for components:
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- Component.Container
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add()
- adds child component to the container.
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remove()
- removes the child component from the container.
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removeAll()
- removes all children components from te container.
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getOwnComponent()
- returns the component directly owned by this container.
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getComponent()
- returns the component belonging to the whole components tree below this container.
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getComponentNN()
- returns the component belonging to the whole components tree below this container. Throws an exception if not found.
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getOwnComponents()
- returns all components directly owned by this container.
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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
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- Component.OrderedContainer
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indexOf()
- returns the index of a given component in an ordered container.
Available for components:
BoxLayout - CssLayout - Frame - GroupBoxLayout - ScrollBoxLayout -
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- Component.HasSettings
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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
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- Component.HasValue
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addValueChangeListener()
- adds the listener implementing theValueChangeListener
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
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- Component.LayoutClickNotifier
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addLayoutClickListener()
- adds the listener implementing theLayoutClickListener
interface to intercept the clicks on the component area.vbox.addLayoutClickListener(event -> showNotification("Clicked"));
Available for components:
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- Component.Margin
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setMargin()
- sets the margins for the component.-
Sets margins on all sides of the component:
vbox.setMargin(true);
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Sets margins only on the top and the bottom of the component:
vbox.setMargin(true, false, true, false);
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Creates new instance of
MarginInfo
configuration class:vbox.setMargin(new MarginInfo(true, false, false, true));
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getMargin()
- returns margin configuration as an instance ofMarginInfo
class.
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- Component.OuterMargin
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setOuterMargin()
- sets the outer margins outside the border of the component.-
Sets outer margins on all sides of the component:
groupBox.setOuterMargin(true);
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Sets outer margins only on the top and the bottom of the component:
groupBox.setOuterMargin(true, false, true, false);
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Creates new instance of
MarginInfo
configuration class:groupBox.setOuterMargin(new MarginInfo(true, false, false, true));
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getOuterMargin()
- returns outer margin configuration as an instance ofMarginInfo
class.
Available for component:
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- Component.ShortcutNotifier
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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:
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- Component.Spacing
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setSpacing()
- adds space between the component and its child components.vbox.setSpacing(true);
Available for components:
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