IT. Expert System.

Java Standard Edition (SE)

JSplitPane


javax.swing

Class 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()
    • 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
      • 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

      • 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()
      • 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
      • 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)
      • 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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