- All Implemented Interfaces:
Styleable
,EventTarget
The top and bottom children will be resized to their preferred heights and extend the width of the border pane. The left and right children will be resized to their preferred widths and extend the length between the top and bottom nodes. And the center node will be resized to fill the available space in the middle. Any of the positions may be null. Example:
BorderPane borderPane = new BorderPane();
ToolBar toolbar = new ToolBar();
HBox statusbar = new HBox();
Node appContent = new AppContentNode();
borderPane.setTop(toolbar);
borderPane.setCenter(appContent);
borderPane.setBottom(statusbar);
Borderpanes may be styled with backgrounds and borders using CSS. See
Region
superclass for details.
BorderPane honors the minimum, preferred, and maximum sizes of its children. If the child's resizable range prevents it from be resized to fit within its position, it will be aligned relative to the space using a default alignment as follows:
- top: Pos.TOP_LEFT
- bottom: Pos.BOTTOM_LEFT
- left: Pos.TOP_LEFT
- right: Pos.TOP_RIGHT
- center: Pos.CENTER
BorderPane lays out each child set in the five positions regardless of the child's visible property value; unmanaged children are ignored.
Resizable Range
BorderPane is commonly used as the root of a Scene
,
in which case its size will track the size of the scene. If the scene or stage
size has not been directly set by the application, the scene size will be
initialized to the border pane's preferred size. However, if a border pane
has a parent other than the scene, that parent will resize the border pane within
the border pane's resizable range during layout. By default the border pane
computes this range based on its content as outlined in the table below.
width | height | |
---|---|---|
minimum | left/right insets plus width required to display right/left children at their pref widths and top/bottom/center with at least their min widths | top/bottom insets plus height required to display top/bottom children at their pref heights and left/right/center with at least their min heights |
preferred | left/right insets plus width required to display top/right/bottom/left/center children with at least their pref widths | top/bottom insets plus height required to display top/right/bottom/left/center children with at least their pref heights |
maximum | Double.MAX_VALUE | Double.MAX_VALUE |
A border pane'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.
BorderPane provides properties for setting the size range directly. These properties default to the sentinel value Region.USE_COMPUTED_SIZE, however the application may set them to other values as needed:
borderPane.setPrefSize(500,400);
Applications may restore the computed values by setting these properties back
to Region.USE_COMPUTED_SIZE.
BorderPane 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 it space.
Optional Layout Constraints
An application may set constraints on individual children to customize BorderPane's layout. For each constraint, BorderPane provides a static method for setting it on the child.
Constraint | Type | Description |
---|---|---|
alignment | javafx.geometry.Pos | The alignment of the child within its area of the border pane. |
margin | javafx.geometry.Insets | Margin space around the outside of the child. |
Example:
ListView list = new ListView();
BorderPane.setAlignment(list, Pos.TOP_LEFT);
BorderPane.setMargin(list, new Insets(12,12,12,12));
borderPane.setCenter(list);
- Since:
- JavaFX 2.0
-
Property Summary
TypePropertyDescriptionfinal ObjectProperty
<Node> The node placed on the bottom edge of this border pane.final ObjectProperty
<Node> The node placed in the center of this border pane.final ObjectProperty
<Node> The node placed on the left edge of this border pane.final ObjectProperty
<Node> The node placed on the right edge of this border pane.final ObjectProperty
<Node> The node placed on the top edge of this border pane.Properties declared in class javafx.scene.layout.Region
background, border, cacheShape, centerShape, height, insets, maxHeight, maxWidth, minHeight, minWidth, opaqueInsets, padding, prefHeight, prefWidth, scaleShape, shape, snapToPixel, width
Properties declared in class javafx.scene.Parent
needsLayout
Properties declared in class javafx.scene.Node
accessibleHelp, accessibleRoleDescription, accessibleRole, accessibleText, blendMode, boundsInLocal, boundsInParent, cacheHint, cache, clip, cursor, depthTest, disabled, disable, effectiveNodeOrientation, effect, eventDispatcher, focused, focusTraversable, focusVisible, focusWithin, hover, id, inputMethodRequests, layoutBounds, layoutX, layoutY, localToParentTransform, localToSceneTransform, managed, mouseTransparent, nodeOrientation, onContextMenuRequested, onDragDetected, onDragDone, onDragDropped, onDragEntered, onDragExited, onDragOver, onInputMethodTextChanged, onKeyPressed, onKeyReleased, onKeyTyped, onMouseClicked, onMouseDragEntered, onMouseDragExited, onMouseDragged, onMouseDragOver, onMouseDragReleased, onMouseEntered, onMouseExited, onMouseMoved, onMousePressed, onMouseReleased, onRotate, onRotationFinished, onRotationStarted, onScrollFinished, onScroll, onScrollStarted, onSwipeDown, onSwipeLeft, onSwipeRight, onSwipeUp, onTouchMoved, onTouchPressed, onTouchReleased, onTouchStationary, onZoomFinished, onZoom, onZoomStarted, opacity, parent, pickOnBounds, pressed, rotate, rotationAxis, scaleX, scaleY, scaleZ, scene, style, translateX, translateY, translateZ, viewOrder, visible
-
Field Summary
Fields declared in class javafx.scene.layout.Region
USE_COMPUTED_SIZE, USE_PREF_SIZE
Fields declared in class javafx.scene.Node
BASELINE_OFFSET_SAME_AS_HEIGHT
-
Constructor Summary
ConstructorDescriptionCreates a BorderPane layout.BorderPane
(Node center) Creates an BorderPane layout with the given Node as the center of the BorderPane.Creates an BorderPane layout with the given Nodes to use for each of the main layout areas of the Border Pane. -
Method Summary
Modifier and TypeMethodDescriptionfinal ObjectProperty
<Node> The node placed on the bottom edge of this border pane.final ObjectProperty
<Node> The node placed in the center of this border pane.static void
clearConstraints
(Node child) Removes all border pane constraints from the child node.static Pos
getAlignment
(Node child) Returns the child's alignment constraint if set.final Node
Gets the value of thebottom
property.final Node
Gets the value of thecenter
property.Returns the orientation of a node's resizing bias for layout purposes.final Node
getLeft()
Gets the value of theleft
property.static Insets
Returns the child's margin constraint if set.final Node
getRight()
Gets the value of theright
property.final Node
getTop()
Gets the value of thetop
property.final ObjectProperty
<Node> The node placed on the left edge of this border pane.final ObjectProperty
<Node> The node placed on the right edge of this border pane.static void
setAlignment
(Node child, Pos value) Sets the alignment for the child when contained by a border pane.final void
Sets the value of thebottom
property.final void
Sets the value of thecenter
property.final void
Sets the value of theleft
property.static void
Sets the margin for the child when contained by a border pane.final void
Sets the value of theright
property.final void
Sets the value of thetop
property.final ObjectProperty
<Node> The node placed on the top edge of this border pane.Methods declared in class javafx.scene.layout.Pane
getChildren
Methods declared in class javafx.scene.layout.Region
backgroundProperty, borderProperty, cacheShapeProperty, centerShapeProperty, computeMaxHeight, computeMaxWidth, computeMinHeight, computeMinWidth, computePrefHeight, computePrefWidth, getBackground, getBorder, getClassCssMetaData, getCssMetaData, getHeight, getInsets, getMaxHeight, getMaxWidth, getMinHeight, getMinWidth, getOpaqueInsets, getPadding, getPrefHeight, getPrefWidth, getShape, getUserAgentStylesheet, getWidth, heightProperty, insetsProperty, isCacheShape, isCenterShape, isResizable, isScaleShape, isSnapToPixel, layoutInArea, layoutInArea, layoutInArea, layoutInArea, maxHeight, maxHeightProperty, maxWidth, maxWidthProperty, minHeight, minHeightProperty, minWidth, minWidthProperty, opaqueInsetsProperty, paddingProperty, positionInArea, positionInArea, prefHeight, prefHeightProperty, prefWidth, prefWidthProperty, resize, scaleShapeProperty, setBackground, setBorder, setCacheShape, setCenterShape, setHeight, setMaxHeight, setMaxSize, setMaxWidth, setMinHeight, setMinSize, setMinWidth, setOpaqueInsets, setPadding, setPrefHeight, setPrefSize, setPrefWidth, setScaleShape, setShape, setSnapToPixel, setWidth, shapeProperty, snappedBottomInset, snappedLeftInset, snappedRightInset, snappedTopInset, snapPosition, snapPositionX, snapPositionY, snapSize, snapSizeX, snapSizeY, snapSpace, snapSpaceX, snapSpaceY, snapToPixelProperty, widthProperty
Methods declared in class javafx.scene.Parent
getBaselineOffset, getChildrenUnmodifiable, getManagedChildren, getStylesheets, isNeedsLayout, layout, layoutChildren, needsLayoutProperty, requestLayout, requestParentLayout, setNeedsLayout, updateBounds
Methods declared in class javafx.scene.Node
accessibleHelpProperty, accessibleRoleDescriptionProperty, accessibleRoleProperty, accessibleTextProperty, addEventFilter, addEventHandler, applyCss, autosize, blendModeProperty, boundsInLocalProperty, boundsInParentProperty, buildEventDispatchChain, cacheHintProperty, cacheProperty, clipProperty, computeAreaInScreen, contains, contains, cursorProperty, depthTestProperty, disabledProperty, disableProperty, effectiveNodeOrientationProperty, effectProperty, eventDispatcherProperty, executeAccessibleAction, fireEvent, focusedProperty, focusTraversableProperty, focusVisibleProperty, focusWithinProperty, getAccessibleHelp, getAccessibleRole, getAccessibleRoleDescription, getAccessibleText, getBlendMode, getBoundsInLocal, getBoundsInParent, getCacheHint, getClip, getCursor, getDepthTest, getEffect, getEffectiveNodeOrientation, getEventDispatcher, getId, getInitialCursor, getInitialFocusTraversable, getInputMethodRequests, getLayoutBounds, getLayoutX, getLayoutY, getLocalToParentTransform, getLocalToSceneTransform, getNodeOrientation, getOnContextMenuRequested, getOnDragDetected, getOnDragDone, getOnDragDropped, getOnDragEntered, getOnDragExited, getOnDragOver, getOnInputMethodTextChanged, getOnKeyPressed, getOnKeyReleased, getOnKeyTyped, getOnMouseClicked, getOnMouseDragEntered, getOnMouseDragExited, getOnMouseDragged, getOnMouseDragOver, getOnMouseDragReleased, getOnMouseEntered, getOnMouseExited, getOnMouseMoved, getOnMousePressed, getOnMouseReleased, getOnRotate, getOnRotationFinished, getOnRotationStarted, getOnScroll, getOnScrollFinished, getOnScrollStarted, getOnSwipeDown, getOnSwipeLeft, getOnSwipeRight, getOnSwipeUp, getOnTouchMoved, getOnTouchPressed, getOnTouchReleased, getOnTouchStationary, getOnZoom, getOnZoomFinished, getOnZoomStarted, getOpacity, getParent, getProperties, getPseudoClassStates, getRotate, getRotationAxis, getScaleX, getScaleY, getScaleZ, getScene, getStyle, getStyleableParent, getStyleClass, getTransforms, getTranslateX, getTranslateY, getTranslateZ, getTypeSelector, getUserData, getViewOrder, hasProperties, hoverProperty, idProperty, inputMethodRequestsProperty, intersects, intersects, isCache, isDisable, isDisabled, isFocused, isFocusTraversable, isFocusVisible, isFocusWithin, isHover, isManaged, isMouseTransparent, isPickOnBounds, isPressed, isVisible, layoutBoundsProperty, layoutXProperty, layoutYProperty, localToParent, localToParent, localToParent, localToParent, localToParent, localToParentTransformProperty, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToSceneTransformProperty, localToScreen, localToScreen, localToScreen, localToScreen, localToScreen, lookup, lookupAll, managedProperty, mouseTransparentProperty, nodeOrientationProperty, notifyAccessibleAttributeChanged, onContextMenuRequestedProperty, onDragDetectedProperty, onDragDoneProperty, onDragDroppedProperty, onDragEnteredProperty, onDragExitedProperty, onDragOverProperty, onInputMethodTextChangedProperty, onKeyPressedProperty, onKeyReleasedProperty, onKeyTypedProperty, onMouseClickedProperty, onMouseDragEnteredProperty, onMouseDragExitedProperty, onMouseDraggedProperty, onMouseDragOverProperty, onMouseDragReleasedProperty, onMouseEnteredProperty, onMouseExitedProperty, onMouseMovedProperty, onMousePressedProperty, onMouseReleasedProperty, onRotateProperty, onRotationFinishedProperty, onRotationStartedProperty, onScrollFinishedProperty, onScrollProperty, onScrollStartedProperty, onSwipeDownProperty, onSwipeLeftProperty, onSwipeRightProperty, onSwipeUpProperty, onTouchMovedProperty, onTouchPressedProperty, onTouchReleasedProperty, onTouchStationaryProperty, onZoomFinishedProperty, onZoomProperty, onZoomStartedProperty, opacityProperty, parentProperty, parentToLocal, parentToLocal, parentToLocal, parentToLocal, parentToLocal, pickOnBoundsProperty, pressedProperty, pseudoClassStateChanged, queryAccessibleAttribute, relocate, removeEventFilter, removeEventHandler, requestFocus, resizeRelocate, rotateProperty, rotationAxisProperty, scaleXProperty, scaleYProperty, scaleZProperty, sceneProperty, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, screenToLocal, screenToLocal, screenToLocal, setAccessibleHelp, setAccessibleRole, setAccessibleRoleDescription, setAccessibleText, setBlendMode, setCache, setCacheHint, setClip, setCursor, setDepthTest, setDisable, setDisabled, setEffect, setEventDispatcher, setEventHandler, setFocused, setFocusTraversable, setHover, setId, setInputMethodRequests, setLayoutX, setLayoutY, setManaged, setMouseTransparent, setNodeOrientation, setOnContextMenuRequested, setOnDragDetected, setOnDragDone, setOnDragDropped, setOnDragEntered, setOnDragExited, setOnDragOver, setOnInputMethodTextChanged, setOnKeyPressed, setOnKeyReleased, setOnKeyTyped, setOnMouseClicked, setOnMouseDragEntered, setOnMouseDragExited, setOnMouseDragged, setOnMouseDragOver, setOnMouseDragReleased, setOnMouseEntered, setOnMouseExited, setOnMouseMoved, setOnMousePressed, setOnMouseReleased, setOnRotate, setOnRotationFinished, setOnRotationStarted, setOnScroll, setOnScrollFinished, setOnScrollStarted, setOnSwipeDown, setOnSwipeLeft, setOnSwipeRight, setOnSwipeUp, setOnTouchMoved, setOnTouchPressed, setOnTouchReleased, setOnTouchStationary, setOnZoom, setOnZoomFinished, setOnZoomStarted, setOpacity, setPickOnBounds, setPressed, setRotate, setRotationAxis, setScaleX, setScaleY, setScaleZ, setStyle, setTranslateX, setTranslateY, setTranslateZ, setUserData, setViewOrder, setVisible, snapshot, snapshot, startDragAndDrop, startFullDrag, styleProperty, toBack, toFront, toString, translateXProperty, translateYProperty, translateZProperty, usesMirroring, viewOrderProperty, visibleProperty
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods declared in interface javafx.css.Styleable
getStyleableNode
-
Property Details
-
center
The node placed in the center of this border pane. If resizable, it will be resized fill the center of the border pane between the top, bottom, left, and right nodes. If the node cannot be resized to fill the center space (it's not resizable or its max size prevents it) then it will be center aligned unless the child's alignment constraint has been set.- See Also:
-
top
The node placed on the top edge of this border pane. If resizable, it will be resized to its preferred height and it's width will span the width of the border pane. If the node cannot be resized to fill the top space (it's not resizable or its max size prevents it) then it will be aligned top-left within the space unless the child's alignment constraint has been set.- See Also:
-
bottom
The node placed on the bottom edge of this border pane. If resizable, it will be resized to its preferred height and it's width will span the width of the border pane. If the node cannot be resized to fill the bottom space (it's not resizable or its max size prevents it) then it will be aligned bottom-left within the space unless the child's alignment constraint has been set.- See Also:
-
left
The node placed on the left edge of this border pane. If resizable, it will be resized to its preferred width and it's height will span the height of the border pane between the top and bottom nodes. If the node cannot be resized to fill the left space (it's not resizable or its max size prevents it) then it will be aligned top-left within the space unless the child's alignment constraint has been set.- See Also:
-
right
The node placed on the right edge of this border pane. If resizable, it will be resized to its preferred width and it's height will span the height of the border pane between the top and bottom nodes. If the node cannot be resized to fill the right space (it's not resizable or its max size prevents it) then it will be aligned top-right within the space unless the child's alignment constraint has been set.- See Also:
-
-
Constructor Details
-
BorderPane
public BorderPane()Creates a BorderPane layout. -
BorderPane
Creates an BorderPane layout with the given Node as the center of the BorderPane.- Parameters:
center
- The node to set as the center of the BorderPane.- Since:
- JavaFX 8.0
-
BorderPane
Creates an BorderPane layout with the given Nodes to use for each of the main layout areas of the Border Pane. The top, right, bottom, and left nodes are listed in clockwise order.- Parameters:
center
- The node to set as the center of the BorderPane.top
- The node to set as the top of the BorderPane.right
- The node to set as the right of the BorderPane.bottom
- The node to set as the bottom of the BorderPane.left
- The node to set as the left of the BorderPane.- Since:
- JavaFX 8.0
-
-
Method Details
-
setAlignment
Sets the alignment for the child when contained by a border pane. If set, will override the border pane's default alignment for the child's position. Setting the value to null will remove the constraint.- Parameters:
child
- the child node of a border panevalue
- the alignment position for the child
-
getAlignment
Returns the child's alignment constraint if set.- Parameters:
child
- the child node of a border pane- Returns:
- the alignment position for the child or null if no alignment was set
-
setMargin
Sets the margin for the child when contained by a border pane. If set, the border pane will lay it out with the margin space around it. Setting the value to null will remove the constraint.- Parameters:
child
- the child node of a border panevalue
- the margin of space around the child
-
getMargin
Returns the child's margin constraint if set.- Parameters:
child
- the child node of a border pane- Returns:
- the margin for the child or null if no margin was set
-
clearConstraints
Removes all border pane constraints from the child node.- Parameters:
child
- the child node
-
centerProperty
The node placed in the center of this border pane. If resizable, it will be resized fill the center of the border pane between the top, bottom, left, and right nodes. If the node cannot be resized to fill the center space (it's not resizable or its max size prevents it) then it will be center aligned unless the child's alignment constraint has been set.- Returns:
- the node placed in the center of this border pane
- See Also:
-
setCenter
Sets the value of thecenter
property.- Property description:
- The node placed in the center of this border pane. If resizable, it will be resized fill the center of the border pane between the top, bottom, left, and right nodes. If the node cannot be resized to fill the center space (it's not resizable or its max size prevents it) then it will be center aligned unless the child's alignment constraint has been set.
- Parameters:
value
- the value for thecenter
property- See Also:
-
getCenter
Gets the value of thecenter
property.- Property description:
- The node placed in the center of this border pane. If resizable, it will be resized fill the center of the border pane between the top, bottom, left, and right nodes. If the node cannot be resized to fill the center space (it's not resizable or its max size prevents it) then it will be center aligned unless the child's alignment constraint has been set.
- Returns:
- the value of the
center
property - See Also:
-
topProperty
The node placed on the top edge of this border pane. If resizable, it will be resized to its preferred height and it's width will span the width of the border pane. If the node cannot be resized to fill the top space (it's not resizable or its max size prevents it) then it will be aligned top-left within the space unless the child's alignment constraint has been set.- Returns:
- the node placed on the top edge of this border pane
- See Also:
-
setTop
Sets the value of thetop
property.- Property description:
- The node placed on the top edge of this border pane. If resizable, it will be resized to its preferred height and it's width will span the width of the border pane. If the node cannot be resized to fill the top space (it's not resizable or its max size prevents it) then it will be aligned top-left within the space unless the child's alignment constraint has been set.
- Parameters:
value
- the value for thetop
property- See Also:
-
getTop
Gets the value of thetop
property.- Property description:
- The node placed on the top edge of this border pane. If resizable, it will be resized to its preferred height and it's width will span the width of the border pane. If the node cannot be resized to fill the top space (it's not resizable or its max size prevents it) then it will be aligned top-left within the space unless the child's alignment constraint has been set.
- Returns:
- the value of the
top
property - See Also:
-
bottomProperty
The node placed on the bottom edge of this border pane. If resizable, it will be resized to its preferred height and it's width will span the width of the border pane. If the node cannot be resized to fill the bottom space (it's not resizable or its max size prevents it) then it will be aligned bottom-left within the space unless the child's alignment constraint has been set.- Returns:
- the node placed on the bottom edge of this border pane
- See Also:
-
setBottom
Sets the value of thebottom
property.- Property description:
- The node placed on the bottom edge of this border pane. If resizable, it will be resized to its preferred height and it's width will span the width of the border pane. If the node cannot be resized to fill the bottom space (it's not resizable or its max size prevents it) then it will be aligned bottom-left within the space unless the child's alignment constraint has been set.
- Parameters:
value
- the value for thebottom
property- See Also:
-
getBottom
Gets the value of thebottom
property.- Property description:
- The node placed on the bottom edge of this border pane. If resizable, it will be resized to its preferred height and it's width will span the width of the border pane. If the node cannot be resized to fill the bottom space (it's not resizable or its max size prevents it) then it will be aligned bottom-left within the space unless the child's alignment constraint has been set.
- Returns:
- the value of the
bottom
property - See Also:
-
leftProperty
The node placed on the left edge of this border pane. If resizable, it will be resized to its preferred width and it's height will span the height of the border pane between the top and bottom nodes. If the node cannot be resized to fill the left space (it's not resizable or its max size prevents it) then it will be aligned top-left within the space unless the child's alignment constraint has been set.- Returns:
- the node placed on the left edge of this border pane
- See Also:
-
setLeft
Sets the value of theleft
property.- Property description:
- The node placed on the left edge of this border pane. If resizable, it will be resized to its preferred width and it's height will span the height of the border pane between the top and bottom nodes. If the node cannot be resized to fill the left space (it's not resizable or its max size prevents it) then it will be aligned top-left within the space unless the child's alignment constraint has been set.
- Parameters:
value
- the value for theleft
property- See Also:
-
getLeft
Gets the value of theleft
property.- Property description:
- The node placed on the left edge of this border pane. If resizable, it will be resized to its preferred width and it's height will span the height of the border pane between the top and bottom nodes. If the node cannot be resized to fill the left space (it's not resizable or its max size prevents it) then it will be aligned top-left within the space unless the child's alignment constraint has been set.
- Returns:
- the value of the
left
property - See Also:
-
rightProperty
The node placed on the right edge of this border pane. If resizable, it will be resized to its preferred width and it's height will span the height of the border pane between the top and bottom nodes. If the node cannot be resized to fill the right space (it's not resizable or its max size prevents it) then it will be aligned top-right within the space unless the child's alignment constraint has been set.- Returns:
- the node placed on the right edge of this border pane
- See Also:
-
setRight
Sets the value of theright
property.- Property description:
- The node placed on the right edge of this border pane. If resizable, it will be resized to its preferred width and it's height will span the height of the border pane between the top and bottom nodes. If the node cannot be resized to fill the right space (it's not resizable or its max size prevents it) then it will be aligned top-right within the space unless the child's alignment constraint has been set.
- Parameters:
value
- the value for theright
property- See Also:
-
getRight
Gets the value of theright
property.- Property description:
- The node placed on the right edge of this border pane. If resizable, it will be resized to its preferred width and it's height will span the height of the border pane between the top and bottom nodes. If the node cannot be resized to fill the right space (it's not resizable or its max size prevents it) then it will be aligned top-right within the space unless the child's alignment constraint has been set.
- Returns:
- the value of the
right
property - See Also:
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getContentBias
Description copied from class:Node
Returns the orientation of a node's resizing bias for layout purposes. If the node type has no bias, returns null. If the node is resizable and it's height depends on its width, returns HORIZONTAL, else if its width depends on its height, returns VERTICAL.Resizable subclasses should override this method to return an appropriate value.
- Overrides:
getContentBias
in classNode
- Returns:
- null unless the center, right, bottom, left or top has a content bias.
- See Also:
-