ContextMenu (JavaFX 19)
Description: declaration: module: javafx.controls, package: javafx.scene.control, class: ContextMenu

Module javafx.controls
Package javafx.scene.control

# Class ContextMenu

java.lang.Object
javafx.stage.Window
javafx.stage.PopupWindow
javafx.scene.control.PopupControl
javafx.scene.control.ContextMenu

All Implemented Interfaces:
  `Styleable`, `EventTarget`, `Skinnable`

@IDProperty("id") public class ContextMenu extends PopupControl

A popup control containing an ObservableList of menu items. The `items` ObservableList allows for any `MenuItem` type to be inserted, including its subclasses `Menu`, `MenuItem`, `RadioMenuItem`, `CheckMenuItem` and `CustomMenuItem`. If an arbitrary Node needs to be inserted into a menu, a CustomMenuItem can be used. One exception to this general rule is that `SeparatorMenuItem` could be used for inserting a separator.

A common use case for this class is creating and showing context menus to users. To create a context menu using ContextMenu you can do the following:

    final ContextMenu contextMenu = new ContextMenu();
    contextMenu.setOnShowing(new EventHandler<WindowEvent>() {
        public void handle(WindowEvent e) {
            System.out.println("showing");
        }
    });
    contextMenu.setOnShown(new EventHandler<WindowEvent>() {
        public void handle(WindowEvent e) {
            System.out.println("shown");
        }
    });

    MenuItem item1 = new MenuItem("About");
    item1.setOnAction(new EventHandler<ActionEvent>() {
        public void handle(ActionEvent e) {
            System.out.println("About");
        }
    });
    MenuItem item2 = new MenuItem("Preferences");
    item2.setOnAction(new EventHandler<ActionEvent>() {
        public void handle(ActionEvent e) {
            System.out.println("Preferences");
        }
    });
    contextMenu.getItems().addAll(item1, item2);

    final TextField textField = new TextField("Type Something");
    textField.setContextMenu(contextMenu);

`Control.setContextMenu(javafx.scene.control.ContextMenu)` convenience method can be used to set a context menu on on any control. The example above results in the context menu being displayed on the right `Side` of the TextField. Alternatively, an event handler can also be set on the control to invoke the context menu as shown below.

    textField.setOnAction(new EventHandler<ActionEvent>() {
        public void handle(ActionEvent e) {
            contextMenu.show(textField, Side.BOTTOM, 0, 0);
        }
    });

    Group root = (Group) scene.getRoot();
    root.getChildren().add(textField);

In this example, the context menu is shown when the user clicks on the `Button` (of course, you should use the `MenuButton` control to do this rather than doing the above).

Note that the show function used in the code sample above will result in the ContextMenu appearing directly beneath the TextField. You can vary the `Side` to get the results you expect.

Since:
  JavaFX 2.0
See Also:
  - `MenuItem`
  - `Menu`

- ## Property Summary

  Properties
  Type
  Property
  Description
  `final ObjectProperty<EventHandler<ActionEvent>>`
  `onAction`
  Callback function to be informed when an item contained within this `ContextMenu` has been activated.

  ### Properties declared in class javafx.scene.control.PopupControl

  `id, maxHeight, maxWidth, minHeight, minWidth, prefHeight, prefWidth, skin, style`

  ### Properties declared in class javafx.stage.PopupWindow

  `anchorLocation, anchorX, anchorY, autoFix, autoHide, consumeAutoHidingEvents, hideOnEscape, onAutoHide, ownerNode, ownerWindow`

  ### Properties declared in class javafx.stage.Window

  `eventDispatcher, focused, forceIntegerRenderScale, height, onCloseRequest, onHidden, onHiding, onShowing, onShown, opacity, outputScaleX, outputScaleY, renderScaleX, renderScaleY, scene, showing, width, x, y`

- ## Nested Class Summary

  ## Nested classes/interfaces declared in class javafx.scene.control.PopupControl

  `PopupControl.CSSBridge`

  ## Nested classes/interfaces declared in class javafx.stage.PopupWindow

  `PopupWindow.AnchorLocation`

- ## Field Summary

  ### Fields declared in class javafx.scene.control.PopupControl

  `bridge, USE_COMPUTED_SIZE, USE_PREF_SIZE`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `ContextMenu()`
  Create a new ContextMenu
  `ContextMenu(MenuItem... items)`
  Create a new ContextMenu initialized with the given items

- ## Method Summary

  Modifier and Type
  Method
  Description
  `final ObservableList<MenuItem>`
  `getItems()`
  The menu items on the context menu.
  `final EventHandler<ActionEvent>`
  `getOnAction()`
  Gets the value of the property onAction.
  `void`
  `hide()`
  Hides this `ContextMenu` and any visible submenus, assuming that when this function is called that the `ContextMenu` was showing.
  `final ObjectProperty<EventHandler<ActionEvent>>`
  `onActionProperty()`
  Callback function to be informed when an item contained within this `ContextMenu` has been activated.
  `final void`
  `setOnAction(EventHandler<ActionEvent> value)`
  Sets the value of the property onAction.
  `void`
  `show(Node anchor, double screenX, double screenY)`
  Shows the `ContextMenu` at the specified screen coordinates.
  `void`
  `show(Node anchor, Side side, double dx, double dy)`
  Shows the `ContextMenu` relative to the given anchor node, on the side specified by the `side` parameter, and offset by the given `dx` and `dy` values for the x-axis and y-axis, respectively.

  ### Methods declared in class javafx.scene.control.PopupControl

  `createDefaultSkin, getClassCssMetaData, getCssMetaData, getId, getMaxHeight, getMaxWidth, getMinHeight, getMinWidth, getPrefHeight, getPrefWidth, getPseudoClassStates, getSkin, getStyle, getStyleableParent, getStyleClass, getTypeSelector, idProperty, maxHeight, maxHeightProperty, maxWidth, maxWidthProperty, minHeight, minHeightProperty, minWidth, minWidthProperty, prefHeight, prefHeightProperty, prefWidth, prefWidthProperty, pseudoClassStateChanged, setId, setMaxHeight, setMaxSize, setMaxWidth, setMinHeight, setMinSize, setMinWidth, setPrefHeight, setPrefSize, setPrefWidth, setSkin, setStyle, skinProperty, styleProperty`

  ### Methods declared in class javafx.stage.PopupWindow

  `anchorLocationProperty, anchorXProperty, anchorYProperty, autoFixProperty, autoHideProperty, consumeAutoHidingEventsProperty, getAnchorLocation, getAnchorX, getAnchorY, getConsumeAutoHidingEvents, getOnAutoHide, getOwnerNode, getOwnerWindow, hideOnEscapeProperty, isAutoFix, isAutoHide, isHideOnEscape, onAutoHideProperty, ownerNodeProperty, ownerWindowProperty, setAnchorLocation, setAnchorX, setAnchorY, setAutoFix, setAutoHide, setConsumeAutoHidingEvents, setHideOnEscape, setOnAutoHide, setScene, show, show`

  ### Methods declared in class javafx.stage.Window

  `addEventFilter, addEventHandler, buildEventDispatchChain, centerOnScreen, eventDispatcherProperty, fireEvent, focusedProperty, forceIntegerRenderScaleProperty, getEventDispatcher, getHeight, getOnCloseRequest, getOnHidden, getOnHiding, getOnShowing, getOnShown, getOpacity, getOutputScaleX, getOutputScaleY, getProperties, getRenderScaleX, getRenderScaleY, getScene, getUserData, getWidth, getWindows, getX, getY, hasProperties, heightProperty, isFocused, isForceIntegerRenderScale, isShowing, onCloseRequestProperty, onHiddenProperty, onHidingProperty, onShowingProperty, onShownProperty, opacityProperty, outputScaleXProperty, outputScaleYProperty, removeEventFilter, removeEventHandler, renderScaleXProperty, renderScaleYProperty, requestFocus, sceneProperty, setEventDispatcher, setEventHandler, setForceIntegerRenderScale, setHeight, setOnCloseRequest, setOnHidden, setOnHiding, setOnShowing, setOnShown, setOpacity, setRenderScaleX, setRenderScaleY, setUserData, setWidth, setX, setY, show, showingProperty, sizeToScene, widthProperty, xProperty, yProperty`

  ### Methods declared in class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

  ### Methods declared in interface javafx.css.Styleable

  `getStyleableNode`

- ## Property Details

  - ### onAction

    public final ObjectProperty<EventHandler<ActionEvent>> onActionProperty
    Callback function to be informed when an item contained within this `ContextMenu` has been activated. The current implementation informs all parent menus as well, so that it is not necessary to listen to all sub menus for events.
    See Also:
      - `getOnAction()`
      - `setOnAction(EventHandler)`

- ## Constructor Details

  - ### ContextMenu

    public ContextMenu()
    Create a new ContextMenu

  - ### ContextMenu

    public ContextMenu(MenuItem... items)
    Create a new ContextMenu initialized with the given items
    Parameters:
      `items` - the list of menu items

- ## Method Details

  - ### setOnAction

    public final void setOnAction(EventHandler<ActionEvent> value)
    Sets the value of the property onAction.
    Property description:
      Callback function to be informed when an item contained within this `ContextMenu` has been activated. The current implementation informs all parent menus as well, so that it is not necessary to listen to all sub menus for events.

  - ### getOnAction

    public final EventHandler<ActionEvent> getOnAction()
    Gets the value of the property onAction.
    Property description:
      Callback function to be informed when an item contained within this `ContextMenu` has been activated. The current implementation informs all parent menus as well, so that it is not necessary to listen to all sub menus for events.

  - ### onActionProperty

    public final ObjectProperty<EventHandler<ActionEvent>> onActionProperty()
    Callback function to be informed when an item contained within this `ContextMenu` has been activated. The current implementation informs all parent menus as well, so that it is not necessary to listen to all sub menus for events.
    See Also:
      - `getOnAction()`
      - `setOnAction(EventHandler)`

  - ### getItems

    public final ObservableList<MenuItem> getItems()
    The menu items on the context menu. If this ObservableList is modified at runtime, the ContextMenu will update as expected.
    Returns:
      the menu items on this context menu
    See Also:
      - `MenuItem`

  - ### show

    public void show(Node anchor, Side side, double dx, double dy)
    Shows the `ContextMenu` relative to the given anchor node, on the side specified by the `side` parameter, and offset by the given `dx` and `dy` values for the x-axis and y-axis, respectively. If there is not enough room, the menu is moved to the opposite side and the offset is not applied.

    To clarify the purpose of the `side` parameter, consider that it is relative to the anchor node. As such, a `side` of `TOP` would mean that the ContextMenu's bottom left corner is set to the top left corner of the anchor.

    This function is useful for finely tuning the position of a menu, relative to the parent node to ensure close alignment.

    Parameters:
      `anchor` - the anchor node
      `side` - the side
      `dx` - the dx value for the x-axis
      `dy` - the dy value for the y-axis

  - ### show

    public void show(Node anchor, double screenX, double screenY)
    Shows the `ContextMenu` at the specified screen coordinates. If there is not enough room at the specified location to show the `ContextMenu` given its size requirements, the necessary adjustments are made to bring the `ContextMenu` back on screen. This also means that the `ContextMenu` will not span multiple monitors.
    Overrides:
      `show` in class `PopupWindow`
    Parameters:
      `anchor` - the anchor node
      `screenX` - the x position of the anchor in screen coordinates
      `screenY` - the y position of the anchor in screen coordinates

  - ### hide

    public void hide()
    Hides this `ContextMenu` and any visible submenus, assuming that when this function is called that the `ContextMenu` was showing.

    If this `ContextMenu` is not showing, then nothing happens.

    Overrides:
      `hide` in class `PopupWindow`