Java javax.swing Class JSplitPane（JDK8）

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Java™ Platform
Standard Ed. 8

All Classes

Summary:
Nested |
Field |
Constr |
Method

Detail:
Field |
Constr |
Method

java.lang.Object
- java.awt.Component
- - java.awt.Container
  - - javax.swing.JComponent
    - - javax.swing.JSplitPane

All Implemented Interfaces:

ImageObserver, MenuContainer, Serializable, Accessible
```
public class JSplitPane
extends JComponent
implements Accessible
```
JSplitPane is used to divide two (and only two) Components. The two Components are graphically divided based on the look and feel implementation, and the two Components can then be interactively resized by the user. Information on using JSplitPane is in How to Use Split Panes in The Java Tutorial.
The two Components in a split pane can be aligned left to right using JSplitPane.HORIZONTAL_SPLIT, or top to bottom using JSplitPane.VERTICAL_SPLIT. The preferred way to change the size of the Components is to invoke setDividerLocation where location is either the new x or y position, depending on the orientation of the JSplitPane.

To resize the Components to their preferred sizes invoke resetToPreferredSizes.

When the user is resizing the Components the minimum size of the Components is used to determine the maximum/minimum position the Components can be set to. If the minimum size of the two components is greater than the size of the split pane the divider will not allow you to resize it. To alter the minimum size of a JComponent, see JComponent.setMinimumSize(java.awt.Dimension).

When the user resizes the split pane the new space is distributed between the two components based on the resizeWeight property. A value of 0, the default, indicates the right/bottom component gets all the space, where as a value of 1 indicates the left/top component gets all the space.

Warning: Swing is not thread safe. For more information see Swing's Threading Policy.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans™ has been added to the java.beans package. Please see XMLEncoder.

See Also:

setDividerLocation(double), resetToPreferredSizes()

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`protected class`	`JSplitPane.AccessibleJSplitPane` This class implements accessibility support for the `JSplitPane` class.

Nested classes/interfaces inherited from class javax.swing.JComponent
JComponent.AccessibleJComponent

Nested classes/interfaces inherited from class java.awt.Container
Container.AccessibleAWTContainer

Nested classes/interfaces inherited from class java.awt.Component
Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`BOTTOM` Used to add a `Component` below the other `Component`.
`static String`	`CONTINUOUS_LAYOUT_PROPERTY` Bound property name for continuousLayout.
`protected boolean`	`continuousLayout` Whether or not the views are continuously redisplayed while resizing.
`static String`	`DIVIDER` Used to add a `Component` that will represent the divider.
`static String`	`DIVIDER_LOCATION_PROPERTY` Bound property for the dividerLocation.
`static String`	`DIVIDER_SIZE_PROPERTY` Bound property name for border.
`protected int`	`dividerSize` Size of the divider.
`static int`	`HORIZONTAL_SPLIT` Horizontal split indicates the `Component`s are split along the x axis.
`static String`	`LAST_DIVIDER_LOCATION_PROPERTY` Bound property for lastLocation.
`protected int`	`lastDividerLocation` Previous location of the split pane.
`static String`	`LEFT` Used to add a `Component` to the left of the other `Component`.
`protected Component`	`leftComponent` The left or top component.
`static String`	`ONE_TOUCH_EXPANDABLE_PROPERTY` Bound property for oneTouchExpandable.
`protected boolean`	`oneTouchExpandable` Is a little widget provided to quickly expand/collapse the split pane?
`protected int`	`orientation` How the views are split.
`static String`	`ORIENTATION_PROPERTY` Bound property name for orientation (horizontal or vertical).
`static String`	`RESIZE_WEIGHT_PROPERTY` Bound property for weight.
`static String`	`RIGHT` Used to add a `Component` to the right of the other `Component`.
`protected Component`	`rightComponent` The right or bottom component.
`static String`	`TOP` Used to add a `Component` above the other `Component`.
`static int`	`VERTICAL_SPLIT` Vertical split indicates the `Component`s are split along the y axis.

Fields inherited from class javax.swing.JComponent
listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

Fields inherited from class java.awt.Component
accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver
ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

Constructors
Constructor and Description
`JSplitPane()` Creates a new `JSplitPane` configured to arrange the child components side-by-side horizontally, using two buttons for the components.
`JSplitPane(int newOrientation)` Creates a new `JSplitPane` configured with the specified orientation.
`JSplitPane(int newOrientation, boolean newContinuousLayout)` Creates a new `JSplitPane` with the specified orientation and redrawing style.
`JSplitPane(int newOrientation, boolean newContinuousLayout, Component newLeftComponent, Component newRightComponent)` Creates a new `JSplitPane` with the specified orientation and redrawing style, and with the specified components.
`JSplitPane(int newOrientation, Component newLeftComponent, Component newRightComponent)` Creates a new `JSplitPane` with the specified orientation and the specified components.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`protected void`	`addImpl(Component comp, Object constraints, int index)` Adds the specified component to this split pane.
`AccessibleContext`	`getAccessibleContext()` Gets the AccessibleContext associated with this JSplitPane.
`Component`	`getBottomComponent()` Returns the component below, or to the right of the divider.
`int`	`getDividerLocation()` Returns the last value passed to `setDividerLocation`.
`int`	`getDividerSize()` Returns the size of the divider.
`int`	`getLastDividerLocation()` Returns the last location the divider was at.
`Component`	`getLeftComponent()` Returns the component to the left (or above) the divider.
`int`	`getMaximumDividerLocation()` Returns the maximum location of the divider from the look and feel implementation.
`int`	`getMinimumDividerLocation()` Returns the minimum location of the divider from the look and feel implementation.
`int`	`getOrientation()` Returns the orientation.
`double`	`getResizeWeight()` Returns the number that determines how extra space is distributed.
`Component`	`getRightComponent()` Returns the component to the right (or below) the divider.
`Component`	`getTopComponent()` Returns the component above, or to the left of the divider.
`SplitPaneUI`	`getUI()` Returns the `SplitPaneUI` that is providing the current look and feel.
`String`	`getUIClassID()` Returns the name of the L&F class that renders this component.
`boolean`	`isContinuousLayout()` Gets the `continuousLayout` property.
`boolean`	`isOneTouchExpandable()` Gets the `oneTouchExpandable` property.
`boolean`	`isValidateRoot()` Returns true, so that calls to `revalidate` on any descendant of this `JSplitPane` will cause a request to be queued that will validate the `JSplitPane` and all its descendants.
`protected void`	`paintChildren(Graphics g)` Subclassed to message the UI with `finishedPaintingChildren` after super has been messaged, as well as painting the border.
`protected String`	`paramString()` Returns a string representation of this `JSplitPane`.
`void`	`remove(Component component)` Removes the child component, `component` from the pane.
`void`	`remove(int index)` Removes the `Component` at the specified index.
`void`	`removeAll()` Removes all the child components from the split pane.
`void`	`resetToPreferredSizes()` Lays out the `JSplitPane` layout based on the preferred size of the children components.
`void`	`setBottomComponent(Component comp)` Sets the component below, or to the right of the divider.
`void`	`setContinuousLayout(boolean newContinuousLayout)` Sets the value of the `continuousLayout` property, which must be `true` for the child components to be continuously redisplayed and laid out during user intervention.
`void`	`setDividerLocation(double proportionalLocation)` Sets the divider location as a percentage of the `JSplitPane`'s size.
`void`	`setDividerLocation(int location)` Sets the location of the divider.
`void`	`setDividerSize(int newSize)` Sets the size of the divider.
`void`	`setLastDividerLocation(int newLastLocation)` Sets the last location the divider was at to `newLastLocation`.
`void`	`setLeftComponent(Component comp)` Sets the component to the left (or above) the divider.
`void`	`setOneTouchExpandable(boolean newValue)` Sets the value of the `oneTouchExpandable` property, which must be `true` for the `JSplitPane` to provide a UI widget on the divider to quickly expand/collapse the divider.
`void`	`setOrientation(int orientation)` Sets the orientation, or how the splitter is divided.
`void`	`setResizeWeight(double value)` Specifies how to distribute extra space when the size of the split pane changes.
`void`	`setRightComponent(Component comp)` Sets the component to the right (or below) the divider.
`void`	`setTopComponent(Component comp)` Sets the component above, or to the left of the divider.
`void`	`setUI(SplitPaneUI ui)` Sets the L&F object that renders this component.
`void`	`updateUI()` Notification from the `UIManager` that the L&F has changed.

Methods inherited from class javax.swing.JComponent
addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, hide, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingOrigin, isPaintingTile, isRequestFocusEnabled, paint, paintBorder, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update

Methods inherited from class java.awt.Container
add, add, add, add, add, addContainerListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusDownCycle, validate, validateTree

Methods inherited from class java.awt.Component
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - VERTICAL_SPLIT
```
public static final int VERTICAL_SPLIT
```
    Vertical split indicates the Components are split along the y axis. For example the two Components will be split one on top of the other.
    
    See Also:
    
    Constant Field Values
  - HORIZONTAL_SPLIT
```
public static final int HORIZONTAL_SPLIT
```
    Horizontal split indicates the Components are split along the x axis. For example the two Components will be split one to the left of the other.
    
    See Also:
    
    Constant Field Values
  - LEFT
```
public static final String LEFT
```
    Used to add a Component to the left of the other Component.
    
    See Also:
    
    Constant Field Values
  - RIGHT
```
public static final String RIGHT
```
    Used to add a Component to the right of the other Component.
    
    See Also:
    
    Constant Field Values
  - TOP
```
public static final String TOP
```
    Used to add a Component above the other Component.
    
    See Also:
    
    Constant Field Values
  - BOTTOM
```
public static final String BOTTOM
```
    Used to add a Component below the other Component.
    
    See Also:
    
    Constant Field Values
  - DIVIDER
```
public static final String DIVIDER
```
    Used to add a Component that will represent the divider.
    
    See Also:
    
    Constant Field Values
  - ORIENTATION_PROPERTY
```
public static final String ORIENTATION_PROPERTY
```
    Bound property name for orientation (horizontal or vertical).
    
    See Also:
    
    Constant Field Values
  - CONTINUOUS_LAYOUT_PROPERTY
```
public static final String CONTINUOUS_LAYOUT_PROPERTY
```
    Bound property name for continuousLayout.
    
    See Also:
    
    Constant Field Values
  - DIVIDER_SIZE_PROPERTY
```
public static final String DIVIDER_SIZE_PROPERTY
```
    Bound property name for border.
    
    See Also:
    
    Constant Field Values
  - ONE_TOUCH_EXPANDABLE_PROPERTY
```
public static final String ONE_TOUCH_EXPANDABLE_PROPERTY
```
    Bound property for oneTouchExpandable.
    
    See Also:
    
    Constant Field Values
  - LAST_DIVIDER_LOCATION_PROPERTY
```
public static final String LAST_DIVIDER_LOCATION_PROPERTY
```
    Bound property for lastLocation.
    
    See Also:
    
    Constant Field Values
  - DIVIDER_LOCATION_PROPERTY
```
public static final String DIVIDER_LOCATION_PROPERTY
```
    Bound property for the dividerLocation.
    
    Since:
    
    1.3
    
    See Also:
    
    Constant Field Values
  - RESIZE_WEIGHT_PROPERTY
```
public static final String RESIZE_WEIGHT_PROPERTY
```
    Bound property for weight.
    
    Since:
    
    1.3
    
    See Also:
    
    Constant Field Values
  - orientation
```
protected int orientation
```
    How the views are split.
  - continuousLayout
```
protected boolean continuousLayout
```
    Whether or not the views are continuously redisplayed while resizing.
  - leftComponent
```
protected Component leftComponent
```
    The left or top component.
  - rightComponent
```
protected Component rightComponent
```
    The right or bottom component.
  - dividerSize
```
protected int dividerSize
```
    Size of the divider.
  - oneTouchExpandable
```
protected boolean oneTouchExpandable
```
    Is a little widget provided to quickly expand/collapse the split pane?
  - lastDividerLocation
```
protected int lastDividerLocation
```
    Previous location of the split pane.
- Constructor Detail
  - JSplitPane
```
public JSplitPane()
```
    Creates a new JSplitPane configured to arrange the child components side-by-side horizontally, using two buttons for the components.
  - JSplitPane
```
@ConstructorProperties(value="orientation")
public JSplitPane(int newOrientation)
```
    Creates a new JSplitPane configured with the specified orientation.
    
    Parameters:
    
    newOrientation - JSplitPane.HORIZONTAL_SPLIT or JSplitPane.VERTICAL_SPLIT
    
    Throws:
    
    IllegalArgumentException - if orientation is not one of HORIZONTAL_SPLIT or VERTICAL_SPLIT.
  - JSplitPane
```
public JSplitPane(int newOrientation,
                  boolean newContinuousLayout)
```
    Creates a new JSplitPane with the specified orientation and redrawing style.
    
    Parameters:
    
    newOrientation - JSplitPane.HORIZONTAL_SPLIT or JSplitPane.VERTICAL_SPLIT
    
    newContinuousLayout - a boolean, true for the components to redraw continuously as the divider changes position, false to wait until the divider position stops changing to redraw
    
    Throws:
    
    IllegalArgumentException - if orientation is not one of HORIZONTAL_SPLIT or VERTICAL_SPLIT
  - JSplitPane
```
public JSplitPane(int newOrientation,
                  Component newLeftComponent,
                  Component newRightComponent)
```
    Creates a new JSplitPane with the specified orientation and the specified components.
    
    Parameters:
    
    newOrientation - JSplitPane.HORIZONTAL_SPLIT or JSplitPane.VERTICAL_SPLIT
    
    newLeftComponent - the Component that will appear on the left of a horizontally-split pane, or at the top of a vertically-split pane
    
    newRightComponent - the Component that will appear on the right of a horizontally-split pane, or at the bottom of a vertically-split pane
    
    Throws:
    
    IllegalArgumentException - if orientation is not one of: HORIZONTAL_SPLIT or VERTICAL_SPLIT
  - JSplitPane
```
public JSplitPane(int newOrientation,
                  boolean newContinuousLayout,
                  Component newLeftComponent,
                  Component newRightComponent)
```
    Creates a new JSplitPane with the specified orientation and redrawing style, and with the specified components.
    
    Parameters:
    
    newOrientation - JSplitPane.HORIZONTAL_SPLIT or JSplitPane.VERTICAL_SPLIT
    
    newContinuousLayout - a boolean, true for the components to redraw continuously as the divider changes position, false to wait until the divider position stops changing to redraw
    
    newLeftComponent - the Component that will appear on the left of a horizontally-split pane, or at the top of a vertically-split pane
    
    newRightComponent - the Component that will appear on the right of a horizontally-split pane, or at the bottom of a vertically-split pane
    
    Throws:
    
    IllegalArgumentException - if orientation is not one of HORIZONTAL_SPLIT or VERTICAL_SPLIT
- Method Detail
  - setUI
```
public void setUI(SplitPaneUI ui)
```
    Sets the L&F object that renders this component.
    
    Parameters:
    
    ui - the SplitPaneUI L&F object
    
    See Also:
    
    UIDefaults.getUI(javax.swing.JComponent)
  - getUI
```
public SplitPaneUI getUI()
```
    Returns the SplitPaneUI that is providing the current look and feel.
    
    Returns:
    
    the SplitPaneUI object that renders this component
  - updateUI
```
public void updateUI()
```
    Notification from the UIManager that the L&F has changed. Replaces the current UI object with the latest version from the UIManager.
    
    Overrides:
    
    updateUI in class JComponent
    
    See Also:
    
    JComponent.updateUI()
  - getUIClassID
```
public String getUIClassID()
```
    Returns the name of the L&F class that renders this component.
    
    Overrides:
    
    getUIClassID in class JComponent
    
    Returns:
    
    the string "SplitPaneUI"
    
    See Also:
    
    JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)
  - setDividerSize
```
public void setDividerSize(int newSize)
```
    Sets the size of the divider.
    
    Parameters:
    
    newSize - an integer giving the size of the divider in pixels
  - getDividerSize
```
public int getDividerSize()
```
    Returns the size of the divider.
    
    Returns:
    
    an integer giving the size of the divider in pixels
  - setLeftComponent
```
public void setLeftComponent(Component comp)
```
    Sets the component to the left (or above) the divider.
    
    Parameters:
    
    comp - the Component to display in that position
  - getLeftComponent
```
public Component getLeftComponent()
```
    Returns the component to the left (or above) the divider.
    
    Returns:
    
    the Component displayed in that position
  - setTopComponent
```
public void setTopComponent(Component comp)
```
    Sets the component above, or to the left of the divider.
    
    Parameters:
    
    comp - the Component to display in that position
  - getTopComponent
```
public Component getTopComponent()
```
    Returns the component above, or to the left of the divider.
    
    Returns:
    
    the Component displayed in that position
  - setRightComponent
```
public void setRightComponent(Component comp)
```
    Sets the component to the right (or below) the divider.
    
    Parameters:
    
    comp - the Component to display in that position
  - getRightComponent
```
public Component getRightComponent()
```
    Returns the component to the right (or below) the divider.
    
    Returns:
    
    the Component displayed in that position
  - setBottomComponent
```
public void setBottomComponent(Component comp)
```
    Sets the component below, or to the right of the divider.
    
    Parameters:
    
    comp - the Component to display in that position
  - getBottomComponent
```
public Component getBottomComponent()
```
    Returns the component below, or to the right of the divider.
    
    Returns:
    
    the Component displayed in that position
  - setOneTouchExpandable
```
public void setOneTouchExpandable(boolean newValue)
```
    Sets the value of the oneTouchExpandable property, which must be true for the JSplitPane to provide a UI widget on the divider to quickly expand/collapse the divider. The default value of this property is false. Some look and feels might not support one-touch expanding; they will ignore this property.
    
    Parameters:
    
    newValue - true to specify that the split pane should provide a collapse/expand widget
    
    See Also:
    
    isOneTouchExpandable()
  - isOneTouchExpandable
```
public boolean isOneTouchExpandable()
```
    Gets the oneTouchExpandable property.
    
    Returns:
    
    the value of the oneTouchExpandable property
    
    See Also:
    
    setOneTouchExpandable(boolean)
  - setLastDividerLocation
```
public void setLastDividerLocation(int newLastLocation)
```
    Sets the last location the divider was at to newLastLocation.
    
    Parameters:
    
    newLastLocation - an integer specifying the last divider location in pixels, from the left (or upper) edge of the pane to the left (or upper) edge of the divider
  - getLastDividerLocation
```
public int getLastDividerLocation()
```
    Returns the last location the divider was at.
    
    Returns:
    
    an integer specifying the last divider location as a count of pixels from the left (or upper) edge of the pane to the left (or upper) edge of the divider
  - setOrientation
```
public void setOrientation(int orientation)
```
    Sets the orientation, or how the splitter is divided. The options are:
    - JSplitPane.VERTICAL_SPLIT (above/below orientation of components)
    - JSplitPane.HORIZONTAL_SPLIT (left/right orientation of components)
    Parameters:
    
    orientation - an integer specifying the orientation
    
    Throws:
    
    IllegalArgumentException - if orientation is not one of: HORIZONTAL_SPLIT or VERTICAL_SPLIT.
  - getOrientation
```
public int getOrientation()
```
    Returns the orientation.
    
    Returns:
    
    an integer giving the orientation
    
    See Also:
    
    setOrientation(int)
  - setContinuousLayout
```
public void setContinuousLayout(boolean newContinuousLayout)
```
    Sets the value of the continuousLayout property, which must be true for the child components to be continuously redisplayed and laid out during user intervention. The default value of this property is look and feel dependent. Some look and feels might not support continuous layout; they will ignore this property.
    
    Parameters:
    
    newContinuousLayout - true if the components should continuously be redrawn as the divider changes position
    
    See Also:
    
    isContinuousLayout()
  - isContinuousLayout
```
public boolean isContinuousLayout()
```
    Gets the continuousLayout property.
    
    Returns:
    
    the value of the continuousLayout property
    
    See Also:
    
    setContinuousLayout(boolean)
  - setResizeWeight
```
public void setResizeWeight(double value)
```
    Specifies how to distribute extra space when the size of the split pane changes. A value of 0, the default, indicates the right/bottom component gets all the extra space (the left/top component acts fixed), where as a value of 1 specifies the left/top component gets all the extra space (the right/bottom component acts fixed). Specifically, the left/top component gets (weight * diff) extra space and the right/bottom component gets (1 - weight) * diff extra space.
    
    Parameters:
    
    value - as described above
    
    Throws:
    
    IllegalArgumentException - if value is < 0 or > 1
    
    Since:
    
    1.3
  - getResizeWeight
```
public double getResizeWeight()
```
    Returns the number that determines how extra space is distributed.
    
    Returns:
    
    how extra space is to be distributed on a resize of the split pane
    
    Since:
    
    1.3
  - resetToPreferredSizes
```
public void resetToPreferredSizes()
```
    Lays out the JSplitPane layout based on the preferred size of the children components. This will likely result in changing the divider location.
  - setDividerLocation
```
public void setDividerLocation(double proportionalLocation)
```
    Sets the divider location as a percentage of the JSplitPane's size.
    This method is implemented in terms of setDividerLocation(int). This method immediately changes the size of the split pane based on its current size. If the split pane is not correctly realized and on screen, this method will have no effect (new divider location will become (current size * proportionalLocation) which is 0).
    
    Parameters:
    
    proportionalLocation - a double-precision floating point value that specifies a percentage, from zero (top/left) to 1.0 (bottom/right)
    
    Throws:
    
    IllegalArgumentException - if the specified location is < 0 or > 1.0
  - setDividerLocation
```
public void setDividerLocation(int location)
```
    Sets the location of the divider. This is passed off to the look and feel implementation, and then listeners are notified. A value less than 0 implies the divider should be reset to a value that attempts to honor the preferred size of the left/top component. After notifying the listeners, the last divider location is updated, via setLastDividerLocation.
    
    Parameters:
    
    location - an int specifying a UI-specific value (typically a pixel count)
  - getDividerLocation
```
public int getDividerLocation()
```
    Returns the last value passed to setDividerLocation. The value returned from this method may differ from the actual divider location (if setDividerLocation was passed a value bigger than the current size).
    
    Returns:
    
    an integer specifying the location of the divider
  - getMinimumDividerLocation
```
public int getMinimumDividerLocation()
```
    Returns the minimum location of the divider from the look and feel implementation.
    
    Returns:
    
    an integer specifying a UI-specific value for the minimum location (typically a pixel count); or -1 if the UI is null
  - getMaximumDividerLocation
```
public int getMaximumDividerLocation()
```
    Returns the maximum location of the divider from the look and feel implementation.
    
    Returns:
    
    an integer specifying a UI-specific value for the maximum location (typically a pixel count); or -1 if the UI is null
  - remove
```
public void remove(Component component)
```
    Removes the child component, component from the pane. Resets the leftComponent or rightComponent instance variable, as necessary.
    
    Overrides:
    
    remove in class Container
    
    Parameters:
    
    component - the Component to remove
    
    See Also:
    
    Container.add(java.awt.Component), Container.invalidate(), Container.validate(), Container.remove(int)
  - remove
```
public void remove(int index)
```
    Removes the Component at the specified index. Updates the leftComponent and rightComponent instance variables as necessary, and then messages super.
    
    Overrides:
    
    remove in class Container
    
    Parameters:
    
    index - an integer specifying the component to remove, where 1 specifies the left/top component and 2 specifies the bottom/right component
    
    See Also:
    
    Container.add(java.awt.Component), Container.invalidate(), Container.validate(), Container.getComponentCount()
  - removeAll
```
public void removeAll()
```
    Removes all the child components from the split pane. Resets the leftComonent and rightComponent instance variables.
    
    Overrides:
    
    removeAll in class Container
    
    See Also:
    
    Container.add(java.awt.Component), Container.remove(int), Container.invalidate()
  - isValidateRoot
```
public boolean isValidateRoot()
```
    Returns true, so that calls to revalidate on any descendant of this JSplitPane will cause a request to be queued that will validate the JSplitPane and all its descendants.
    
    Overrides:
    
    isValidateRoot in class JComponent
    
    Returns:
    
    true
    
    See Also:
    
    JComponent.revalidate(), Container.isValidateRoot()
  - addImpl
```
protected void addImpl(Component comp,
                       Object constraints,
                       int index)
```
    Adds the specified component to this split pane. If constraints identifies the left/top or right/bottom child component, and a component with that identifier was previously added, it will be removed and then comp will be added in its place. If constraints is not one of the known identifiers the layout manager may throw an IllegalArgumentException.
    The possible constraints objects (Strings) are:
    - JSplitPane.TOP
    - JSplitPane.LEFT
    - JSplitPane.BOTTOM
    - JSplitPane.RIGHT
    If the constraints object is null, the component is added in the first available position (left/top if open, else right/bottom).
    Overrides:
    
    addImpl in class Container
    
    Parameters:
    
    comp - the component to add
    
    constraints - an Object specifying the layout constraints (position) for this component
    
    index - an integer specifying the index in the container's list.
    
    Throws:
    
    IllegalArgumentException - if the constraints object does not match an existing component
    
    See Also:
    
    Container.addImpl(Component, Object, int)
  - paintChildren
```
protected void paintChildren(Graphics g)
```
    Subclassed to message the UI with finishedPaintingChildren after super has been messaged, as well as painting the border.
    
    Overrides:
    
    paintChildren in class JComponent
    
    Parameters:
    
    g - the Graphics context within which to paint
    
    See Also:
    
    JComponent.paint(java.awt.Graphics), Container.paint(java.awt.Graphics)
  - paramString
```
protected String paramString()
```
    Returns a string representation of this JSplitPane. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null.
    
    Overrides:
    
    paramString in class JComponent
    
    Returns:
    
    a string representation of this JSplitPane.
  - getAccessibleContext
```
public AccessibleContext getAccessibleContext()
```
    Gets the AccessibleContext associated with this JSplitPane. For split panes, the AccessibleContext takes the form of an AccessibleJSplitPane. A new AccessibleJSplitPane instance is created if necessary.
    
    Specified by:
    
    getAccessibleContext in interface Accessible
    
    Overrides:
    
    getAccessibleContext in class Component
    
    Returns:
    
    an AccessibleJSplitPane that serves as the AccessibleContext of this JSplitPane

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Java javax.swing Class JSplitPane（JDK8）

Class JSplitPane

Nested Class Summary

Nested classes/interfaces inherited from class javax.swing.JComponent

Nested classes/interfaces inherited from class java.awt.Container

Nested classes/interfaces inherited from class java.awt.Component

Field Summary

Fields inherited from class javax.swing.JComponent

Fields inherited from class java.awt.Component

Fields inherited from interface java.awt.image.ImageObserver

Constructor Summary

Method Summary

Methods inherited from class javax.swing.JComponent

Methods inherited from class java.awt.Container

Methods inherited from class java.awt.Component

Methods inherited from class java.lang.Object

Field Detail

VERTICAL_SPLIT

HORIZONTAL_SPLIT

LEFT

RIGHT

TOP

BOTTOM

DIVIDER

ORIENTATION_PROPERTY

CONTINUOUS_LAYOUT_PROPERTY

DIVIDER_SIZE_PROPERTY

ONE_TOUCH_EXPANDABLE_PROPERTY

LAST_DIVIDER_LOCATION_PROPERTY

DIVIDER_LOCATION_PROPERTY

RESIZE_WEIGHT_PROPERTY

orientation

continuousLayout

leftComponent

rightComponent

dividerSize

oneTouchExpandable

lastDividerLocation

Constructor Detail

JSplitPane

JSplitPane

JSplitPane

JSplitPane

JSplitPane

Method Detail

setUI

getUI

updateUI

getUIClassID

setDividerSize

getDividerSize

setLeftComponent

getLeftComponent

setTopComponent

getTopComponent

setRightComponent

getRightComponent

setBottomComponent

getBottomComponent

setOneTouchExpandable

isOneTouchExpandable

setLastDividerLocation

getLastDividerLocation

setOrientation

getOrientation

setContinuousLayout

isContinuousLayout

setResizeWeight

getResizeWeight

resetToPreferredSizes

setDividerLocation

setDividerLocation

getDividerLocation

getMinimumDividerLocation

getMaximumDividerLocation

remove

remove

removeAll

isValidateRoot

addImpl