StackPane lays out its children in a back-to-front stack.

The z-order of the children is defined by the order of the children list with the 0th child being the bottom and last child on top. If a border and/or padding have been set, the children will be laid out within those insets.

The stackpane will attempt to resize each child to fill its content area. If the child could not be sized to fill the stackpane (either because it was not resizable or its max size prevented it) then it will be aligned within the area using the alignment property, which defaults to Pos.CENTER.

StackPane example:

StackPane stack = new StackPane();
    stack.getChildren().addAll(new Rectangle(100,100,Color.BLUE), new Label("Go!"));

StackPane lays out each managed child regardless of the child's visible property value; unmanaged children are ignored.

StackPane may be styled with backgrounds and borders using CSS. See Region for details.

Resizable Range

A stackpane's parent will resize the stackpane within the stackpane's resizable range during layout. By default the stackpane computes this range based on its content as outlined in the table below.

StackPane Resize Table

	width	height
minimum	left/right insets plus the largest of the children's min widths.	top/bottom insets plus the largest of the children's min heights.
preferred	left/right insets plus the largest of the children's pref widths.	top/bottom insets plus the largest of the children's pref heights.
maximum	Double.MAX_VALUE	Double.MAX_VALUE

A stackpane's unbounded maximum width and height are an indication to the parent that it may be resized beyond its preferred size to fill whatever space is assigned to it.

StackPane provides properties for setting the size range directly. These properties default to the sentinel value USE_COMPUTED_SIZE, however the application may set them to other values as needed:

     // ensure stackpane is never resized beyond it's preferred size
    stackpane.setMaxSize(Region.USE_PREF_SIZE, Region.USE_PREF_SIZE);

Applications may restore the computed values by setting these properties back to USE_COMPUTED_SIZE.

StackPane does not clip its content by default, so it is possible that children's bounds may extend outside its own bounds if a child's min size prevents it from being fit within the stackpane.

Optional Layout Constraints

An application may set constraints on individual children to customize StackPane's layout. For each constraint, StackPane provides a static method for setting it on the child.

StackPane Constraint Table

Constraint	Type	Description
alignment	javafx.geometry.Pos	The alignment of the child within the stackpane.
margin	javafx.geometry.Insets	Margin space around the outside of the child.

Examples:

     // Align the title Label at the bottom-center of the stackpane
    Label title = new Label();
    StackPane.setAlignment(title, Pos.BOTTOM_CENTER);
    stackpane.getChildren.addAll(new ImageView(...), title);

    // Create an 8 pixel margin around a listview in the stackpane
    ListView list = new ListView();
    StackPane.setMargin(list, new Insets(8,8,8,8);
    stackpane.getChildren().add(list);