JDK8/Java8源码在线阅读
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package javax.swing.plaf.basic;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import javax.swing.border.Border;
import java.beans.*;
import sun.swing.DefaultLookup;
/**
* Divider used by BasicSplitPaneUI. Subclassers may wish to override
* paint to do something more interesting.
* The border effect is drawn in BasicSplitPaneUI, so if you don't like
* that border, reset it there.
* To conditionally drag from certain areas subclass mousePressed and
* call super when you wish the dragging to begin.
* <p>
* <strong>Warning:</strong>
* 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 <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @author Scott Violet
*/
public class BasicSplitPaneDivider extends Container
implements PropertyChangeListener
{
/**
* Width or height of the divider based on orientation
* BasicSplitPaneUI adds two to this.
*/
protected static final int ONE_TOUCH_SIZE = 6;
protected static final int ONE_TOUCH_OFFSET = 2;
/**
* Handles mouse dragging message to do the actual dragging.
*/
protected DragController dragger;
/**
* UI this instance was created from.
*/
protected BasicSplitPaneUI splitPaneUI;
/**
* Size of the divider.
*/
protected int dividerSize = 0; // default - SET TO 0???
/**
* Divider that is used for noncontinuous layout mode.
*/
protected Component hiddenDivider;
/**
* JSplitPane the receiver is contained in.
*/
protected JSplitPane splitPane;
/**
* Handles mouse events from both this class, and the split pane.
* Mouse events are handled for the splitpane since you want to be able
* to drag when clicking on the border of the divider, which is not
* drawn by the divider.
*/
protected MouseHandler mouseHandler;
/**
* Orientation of the JSplitPane.
*/
protected int orientation;
/**
* Button for quickly toggling the left component.
*/
protected JButton leftButton;
/**
* Button for quickly toggling the right component.
*/
protected JButton rightButton;
/** Border. */
private Border border;
/**
* Is the mouse over the divider?
*/
private boolean mouseOver;
private int oneTouchSize;
private int oneTouchOffset;
/**
* If true the one touch buttons are centered on the divider.
*/
private boolean centerOneTouchButtons;
/**
* Creates an instance of BasicSplitPaneDivider. Registers this
* instance for mouse events and mouse dragged events.
*/
public BasicSplitPaneDivider(BasicSplitPaneUI ui) {
oneTouchSize = DefaultLookup.getInt(ui.getSplitPane(), ui,
"SplitPane.oneTouchButtonSize", ONE_TOUCH_SIZE);
oneTouchOffset = DefaultLookup.getInt(ui.getSplitPane(), ui,
"SplitPane.oneTouchButtonOffset", ONE_TOUCH_OFFSET);
centerOneTouchButtons = DefaultLookup.getBoolean(ui.getSplitPane(),
ui, "SplitPane.centerOneTouchButtons", true);
setLayout(new DividerLayout());
setBasicSplitPaneUI(ui);
orientation = splitPane.getOrientation();
setCursor((orientation == JSplitPane.HORIZONTAL_SPLIT) ?
Cursor.getPredefinedCursor(Cursor.E_RESIZE_CURSOR) :
Cursor.getPredefinedCursor(Cursor.S_RESIZE_CURSOR));
setBackground(UIManager.getColor("SplitPane.background"));
}
private void revalidateSplitPane() {
invalidate();
if (splitPane != null) {
splitPane.revalidate();
}
}
/**
* Sets the SplitPaneUI that is using the receiver.
*/
public void setBasicSplitPaneUI(BasicSplitPaneUI newUI) {
if (splitPane != null) {
splitPane.removePropertyChangeListener(this);
if (mouseHandler != null) {
splitPane.removeMouseListener(mouseHandler);
splitPane.removeMouseMotionListener(mouseHandler);
removeMouseListener(mouseHandler);
removeMouseMotionListener(mouseHandler);
mouseHandler = null;
}
}
splitPaneUI = newUI;
if (newUI != null) {
splitPane = newUI.getSplitPane();
if (splitPane != null) {
if (mouseHandler == null) mouseHandler = new MouseHandler();
splitPane.addMouseListener(mouseHandler);
splitPane.addMouseMotionListener(mouseHandler);
addMouseListener(mouseHandler);
addMouseMotionListener(mouseHandler);
splitPane.addPropertyChangeListener(this);
if (splitPane.isOneTouchExpandable()) {
oneTouchExpandableChanged();
}
}
}
else {
splitPane = null;
}
}
/**
* Returns the <code>SplitPaneUI</code> the receiver is currently
* in.
*/
public BasicSplitPaneUI getBasicSplitPaneUI() {
return splitPaneUI;
}
/**
* Sets the size of the divider to <code>newSize</code>. That is
* the width if the splitpane is <code>HORIZONTAL_SPLIT</code>, or
* the height of <code>VERTICAL_SPLIT</code>.
*/
public void setDividerSize(int newSize) {
dividerSize = newSize;
}
/**
* Returns the size of the divider, that is the width if the splitpane
* is HORIZONTAL_SPLIT, or the height of VERTICAL_SPLIT.
*/
public int getDividerSize() {
return dividerSize;
}
/**
* Sets the border of this component.
* @since 1.3
*/
public void setBorder(Border border) {
Border oldBorder = this.border;
this.border = border;
}
/**
* Returns the border of this component or null if no border is
* currently set.
*
* @return the border object for this component
* @see #setBorder
* @since 1.3
*/
public Border getBorder() {
return border;
}
/**
* If a border has been set on this component, returns the
* border's insets, else calls super.getInsets.
*
* @return the value of the insets property.
* @see #setBorder
*/
public Insets getInsets() {
Border border = getBorder();
if (border != null) {
return border.getBorderInsets(this);
}
return super.getInsets();
}
/**
* Sets whether or not the mouse is currently over the divider.
*
* @param mouseOver whether or not the mouse is currently over the divider
* @since 1.5
*/
protected void setMouseOver(boolean mouseOver) {
this.mouseOver = mouseOver;
}
/**
* Returns whether or not the mouse is currently over the divider
*
* @return whether or not the mouse is currently over the divider
* @since 1.5
*/
public boolean isMouseOver() {
return mouseOver;
}
/**
* Returns dividerSize x dividerSize
*/
public Dimension getPreferredSize() {
// Ideally this would return the size from the layout manager,
// but that could result in the layed out size being different from
// the dividerSize, which may break developers as well as
// BasicSplitPaneUI.
if (orientation == JSplitPane.HORIZONTAL_SPLIT) {
return new Dimension(getDividerSize(), 1);
}
return new Dimension(1, getDividerSize());
}
/**
* Returns dividerSize x dividerSize
*/
public Dimension getMinimumSize() {
return getPreferredSize();
}
/**
* Property change event, presumably from the JSplitPane, will message
* updateOrientation if necessary.
*/
public void propertyChange(PropertyChangeEvent e) {
if (e.getSource() == splitPane) {
if (e.getPropertyName() == JSplitPane.ORIENTATION_PROPERTY) {
orientation = splitPane.getOrientation();
setCursor((orientation == JSplitPane.HORIZONTAL_SPLIT) ?
Cursor.getPredefinedCursor(Cursor.E_RESIZE_CURSOR) :
Cursor.getPredefinedCursor(Cursor.S_RESIZE_CURSOR));
revalidateSplitPane();
}
else if (e.getPropertyName() == JSplitPane.
ONE_TOUCH_EXPANDABLE_PROPERTY) {
oneTouchExpandableChanged();
}
}
}
/**
* Paints the divider.
*/
public void paint(Graphics g) {
super.paint(g);
// Paint the border.
Border border = getBorder();
if (border != null) {
Dimension size = getSize();
border.paintBorder(this, g, 0, 0, size.width, size.height);
}
}
/**
* Messaged when the oneTouchExpandable value of the JSplitPane the
* receiver is contained in changes. Will create the
* <code>leftButton</code> and <code>rightButton</code> if they
* are null. invalidates the receiver as well.
*/
protected void oneTouchExpandableChanged() {
if (!DefaultLookup.getBoolean(splitPane, splitPaneUI,
"SplitPane.supportsOneTouchButtons", true)) {
// Look and feel doesn't want to support one touch buttons, bail.
return;
}
if (splitPane.isOneTouchExpandable() &&
leftButton == null &&
rightButton == null) {
/* Create the left button and add an action listener to
expand/collapse it. */
leftButton = createLeftOneTouchButton();
if (leftButton != null)
leftButton.addActionListener(new OneTouchActionHandler(true));
/* Create the right button and add an action listener to
expand/collapse it. */
rightButton = createRightOneTouchButton();
if (rightButton != null)
rightButton.addActionListener(new OneTouchActionHandler
(false));
if (leftButton != null && rightButton != null) {
add(leftButton);
add(rightButton);
}
}
revalidateSplitPane();
}
/**
* Creates and return an instance of JButton that can be used to
* collapse the left component in the split pane.
*/
protected JButton createLeftOneTouchButton() {
JButton b = new JButton() {
public void setBorder(Border b) {
}
public void paint(Graphics g) {
if (splitPane != null) {
int[] xs = new int[3];
int[] ys = new int[3];
int blockSize;
// Fill the background first ...
g.setColor(this.getBackground());
g.fillRect(0, 0, this.getWidth(),
this.getHeight());
// ... then draw the arrow.
g.setColor(Color.black);
if (orientation == JSplitPane.VERTICAL_SPLIT) {
blockSize = Math.min(getHeight(), oneTouchSize);
xs[0] = blockSize;
xs[1] = 0;
xs[2] = blockSize << 1;
ys[0] = 0;
ys[1] = ys[2] = blockSize;
g.drawPolygon(xs, ys, 3); // Little trick to make the
// arrows of equal size
}
else {
blockSize = Math.min(getWidth(), oneTouchSize);
xs[0] = xs[2] = blockSize;
xs[1] = 0;
ys[0] = 0;
ys[1] = blockSize;
ys[2] = blockSize << 1;
}
g.fillPolygon(xs, ys, 3);
}
}
// Don't want the button to participate in focus traversable.
public boolean isFocusTraversable() {
return false;
}
};
b.setMinimumSize(new Dimension(oneTouchSize, oneTouchSize));
b.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
b.setFocusPainted(false);
b.setBorderPainted(false);
b.setRequestFocusEnabled(false);
return b;
}
/**
* Creates and return an instance of JButton that can be used to
* collapse the right component in the split pane.
*/
protected JButton createRightOneTouchButton() {
JButton b = new JButton() {
public void setBorder(Border border) {
}
public void paint(Graphics g) {
if (splitPane != null) {
int[] xs = new int[3];
int[] ys = new int[3];
int blockSize;
// Fill the background first ...
g.setColor(this.getBackground());
g.fillRect(0, 0, this.getWidth(),
this.getHeight());
// ... then draw the arrow.
if (orientation == JSplitPane.VERTICAL_SPLIT) {
blockSize = Math.min(getHeight(), oneTouchSize);
xs[0] = blockSize;
xs[1] = blockSize << 1;
xs[2] = 0;
ys[0] = blockSize;
ys[1] = ys[2] = 0;
}
else {
blockSize = Math.min(getWidth(), oneTouchSize);
xs[0] = xs[2] = 0;
xs[1] = blockSize;
ys[0] = 0;
ys[1] = blockSize;
ys[2] = blockSize << 1;
}
g.setColor(Color.black);
g.fillPolygon(xs, ys, 3);
}
}
// Don't want the button to participate in focus traversable.
public boolean isFocusTraversable() {
return false;
}
};
b.setMinimumSize(new Dimension(oneTouchSize, oneTouchSize));
b.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
b.setFocusPainted(false);
b.setBorderPainted(false);
b.setRequestFocusEnabled(false);
return b;
}
/**
* Message to prepare for dragging. This messages the BasicSplitPaneUI
* with startDragging.
*/
protected void prepareForDragging() {
splitPaneUI.startDragging();
}
/**
* Messages the BasicSplitPaneUI with dragDividerTo that this instance
* is contained in.
*/
protected void dragDividerTo(int location) {
splitPaneUI.dragDividerTo(location);
}
/**
* Messages the BasicSplitPaneUI with finishDraggingTo that this instance
* is contained in.
*/
protected void finishDraggingTo(int location) {
splitPaneUI.finishDraggingTo(location);
}
/**
* MouseHandler is responsible for converting mouse events
* (released, dragged...) into the appropriate DragController
* methods.
*
*/
protected class MouseHandler extends MouseAdapter
implements MouseMotionListener
{
/**
* Starts the dragging session by creating the appropriate instance
* of DragController.
*/
public void mousePressed(MouseEvent e) {
if ((e.getSource() == BasicSplitPaneDivider.this ||
e.getSource() == splitPane) &&
dragger == null &&splitPane.isEnabled()) {
Component newHiddenDivider = splitPaneUI.
getNonContinuousLayoutDivider();
if (hiddenDivider != newHiddenDivider) {
if (hiddenDivider != null) {
hiddenDivider.removeMouseListener(this);
hiddenDivider.removeMouseMotionListener(this);
}
hiddenDivider = newHiddenDivider;
if (hiddenDivider != null) {
hiddenDivider.addMouseMotionListener(this);
hiddenDivider.addMouseListener(this);
}
}
if (splitPane.getLeftComponent() != null &&
splitPane.getRightComponent() != null) {
if (orientation == JSplitPane.HORIZONTAL_SPLIT) {
dragger = new DragController(e);
}
else {
dragger = new VerticalDragController(e);
}
if (!dragger.isValid()) {
dragger = null;
}
else {
prepareForDragging();
dragger.continueDrag(e);
}
}
e.consume();
}
}
/**
* If dragger is not null it is messaged with completeDrag.
*/
public void mouseReleased(MouseEvent e) {
if (dragger != null) {
if (e.getSource() == splitPane) {
dragger.completeDrag(e.getX(), e.getY());
}
else if (e.getSource() == BasicSplitPaneDivider.this) {
Point ourLoc = getLocation();
dragger.completeDrag(e.getX() + ourLoc.x,
e.getY() + ourLoc.y);
}
else if (e.getSource() == hiddenDivider) {
Point hDividerLoc = hiddenDivider.getLocation();
int ourX = e.getX() + hDividerLoc.x;
int ourY = e.getY() + hDividerLoc.y;
dragger.completeDrag(ourX, ourY);
}
dragger = null;
e.consume();
}
}
//
// MouseMotionListener
//
/**
* If dragger is not null it is messaged with continueDrag.
*/
public void mouseDragged(MouseEvent e) {
if (dragger != null) {
if (e.getSource() == splitPane) {
dragger.continueDrag(e.getX(), e.getY());
}
else if (e.getSource() == BasicSplitPaneDivider.this) {
Point ourLoc = getLocation();
dragger.continueDrag(e.getX() + ourLoc.x,
e.getY() + ourLoc.y);
}
else if (e.getSource() == hiddenDivider) {
Point hDividerLoc = hiddenDivider.getLocation();
int ourX = e.getX() + hDividerLoc.x;
int ourY = e.getY() + hDividerLoc.y;
dragger.continueDrag(ourX, ourY);
}
e.consume();
}
}
/**
* Resets the cursor based on the orientation.
*/
public void mouseMoved(MouseEvent e) {
}
/**
* Invoked when the mouse enters a component.
*
* @param e MouseEvent describing the details of the enter event.
* @since 1.5
*/
public void mouseEntered(MouseEvent e) {
if (e.getSource() == BasicSplitPaneDivider.this) {
setMouseOver(true);
}
}
/**
* Invoked when the mouse exits a component.
*
* @param e MouseEvent describing the details of the exit event.
* @since 1.5
*/
public void mouseExited(MouseEvent e) {
if (e.getSource() == BasicSplitPaneDivider.this) {
setMouseOver(false);
}
}
}
/**
* Handles the events during a dragging session for a
* HORIZONTAL_SPLIT oriented split pane. This continually
* messages <code>dragDividerTo</code> and then when done messages
* <code>finishDraggingTo</code>. When an instance is created it should be
* messaged with <code>isValid</code> to insure that dragging can happen
* (dragging won't be allowed if the two views can not be resized).
* <p>
* <strong>Warning:</strong>
* 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 <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*/
protected class DragController
{
/**
* Initial location of the divider.
*/
int initialX;
/**
* Maximum and minimum positions to drag to.
*/
int maxX, minX;
/**
* Initial location the mouse down happened at.
*/
int offset;
protected DragController(MouseEvent e) {
JSplitPane splitPane = splitPaneUI.getSplitPane();
Component leftC = splitPane.getLeftComponent();
Component rightC = splitPane.getRightComponent();
initialX = getLocation().x;
if (e.getSource() == BasicSplitPaneDivider.this) {
offset = e.getX();
}
else { // splitPane
offset = e.getX() - initialX;
}
if (leftC == null || rightC == null || offset < -1 ||
offset >= getSize().width) {
// Don't allow dragging.
maxX = -1;
}
else {
Insets insets = splitPane.getInsets();
if (leftC.isVisible()) {
minX = leftC.getMinimumSize().width;
if (insets != null) {
minX += insets.left;
}
}
else {
minX = 0;
}
if (rightC.isVisible()) {
int right = (insets != null) ? insets.right : 0;
maxX = Math.max(0, splitPane.getSize().width -
(getSize().width + right) -
rightC.getMinimumSize().width);
}
else {
int right = (insets != null) ? insets.right : 0;
maxX = Math.max(0, splitPane.getSize().width -
(getSize().width + right));
}
if (maxX < minX) minX = maxX = 0;
}
}
/**
* Returns true if the dragging session is valid.
*/
protected boolean isValid() {
return (maxX > 0);
}
/**
* Returns the new position to put the divider at based on
* the passed in MouseEvent.
*/
protected int positionForMouseEvent(MouseEvent e) {
int newX = (e.getSource() == BasicSplitPaneDivider.this) ?
(e.getX() + getLocation().x) : e.getX();
newX = Math.min(maxX, Math.max(minX, newX - offset));
return newX;
}
/**
* Returns the x argument, since this is used for horizontal
* splits.
*/
protected int getNeededLocation(int x, int y) {
int newX;
newX = Math.min(maxX, Math.max(minX, x - offset));
return newX;
}
protected void continueDrag(int newX, int newY) {
dragDividerTo(getNeededLocation(newX, newY));
}
/**
* Messages dragDividerTo with the new location for the mouse
* event.
*/
protected void continueDrag(MouseEvent e) {
dragDividerTo(positionForMouseEvent(e));
}
protected void completeDrag(int x, int y) {
finishDraggingTo(getNeededLocation(x, y));
}
/**
* Messages finishDraggingTo with the new location for the mouse
* event.
*/
protected void completeDrag(MouseEvent e) {
finishDraggingTo(positionForMouseEvent(e));
}
} // End of BasicSplitPaneDivider.DragController
/**
* Handles the events during a dragging session for a
* VERTICAL_SPLIT oriented split pane. This continually
* messages <code>dragDividerTo</code> and then when done messages
* <code>finishDraggingTo</code>. When an instance is created it should be
* messaged with <code>isValid</code> to insure that dragging can happen
* (dragging won't be allowed if the two views can not be resized).
*/
protected class VerticalDragController extends DragController
{
/* DragControllers ivars are now in terms of y, not x. */
protected VerticalDragController(MouseEvent e) {
super(e);
JSplitPane splitPane = splitPaneUI.getSplitPane();
Component leftC = splitPane.getLeftComponent();
Component rightC = splitPane.getRightComponent();
initialX = getLocation().y;
if (e.getSource() == BasicSplitPaneDivider.this) {
offset = e.getY();
}
else {
offset = e.getY() - initialX;
}
if (leftC == null || rightC == null || offset < -1 ||
offset > getSize().height) {
// Don't allow dragging.
maxX = -1;
}
else {
Insets insets = splitPane.getInsets();
if (leftC.isVisible()) {
minX = leftC.getMinimumSize().height;
if (insets != null) {
minX += insets.top;
}
}
else {
minX = 0;
}
if (rightC.isVisible()) {
int bottom = (insets != null) ? insets.bottom : 0;
maxX = Math.max(0, splitPane.getSize().height -
(getSize().height + bottom) -
rightC.getMinimumSize().height);
}
else {
int bottom = (insets != null) ? insets.bottom : 0;
maxX = Math.max(0, splitPane.getSize().height -
(getSize().height + bottom));
}
if (maxX < minX) minX = maxX = 0;
}
}
/**
* Returns the y argument, since this is used for vertical
* splits.
*/
protected int getNeededLocation(int x, int y) {
int newY;
newY = Math.min(maxX, Math.max(minX, y - offset));
return newY;
}
/**
* Returns the new position to put the divider at based on
* the passed in MouseEvent.
*/
protected int positionForMouseEvent(MouseEvent e) {
int newY = (e.getSource() == BasicSplitPaneDivider.this) ?
(e.getY() + getLocation().y) : e.getY();
newY = Math.min(maxX, Math.max(minX, newY - offset));
return newY;
}
} // End of BasicSplitPaneDividier.VerticalDragController
/**
* Used to layout a <code>BasicSplitPaneDivider</code>.
* Layout for the divider
* involves appropriately moving the left/right buttons around.
*
*/
protected class DividerLayout implements LayoutManager
{
public void layoutContainer(Container c) {
if (leftButton != null && rightButton != null &&
c == BasicSplitPaneDivider.this) {
if (splitPane.isOneTouchExpandable()) {
Insets insets = getInsets();
if (orientation == JSplitPane.VERTICAL_SPLIT) {
int extraX = (insets != null) ? insets.left : 0;
int blockSize = getHeight();
if (insets != null) {
blockSize -= (insets.top + insets.bottom);
blockSize = Math.max(blockSize, 0);
}
blockSize = Math.min(blockSize, oneTouchSize);
int y = (c.getSize().height - blockSize) / 2;
if (!centerOneTouchButtons) {
y = (insets != null) ? insets.top : 0;
extraX = 0;
}
leftButton.setBounds(extraX + oneTouchOffset, y,
blockSize * 2, blockSize);
rightButton.setBounds(extraX + oneTouchOffset +
oneTouchSize * 2, y,
blockSize * 2, blockSize);
}
else {
int extraY = (insets != null) ? insets.top : 0;
int blockSize = getWidth();
if (insets != null) {
blockSize -= (insets.left + insets.right);
blockSize = Math.max(blockSize, 0);
}
blockSize = Math.min(blockSize, oneTouchSize);
int x = (c.getSize().width - blockSize) / 2;
if (!centerOneTouchButtons) {
x = (insets != null) ? insets.left : 0;
extraY = 0;
}
leftButton.setBounds(x, extraY + oneTouchOffset,
blockSize, blockSize * 2);
rightButton.setBounds(x, extraY + oneTouchOffset +
oneTouchSize * 2, blockSize,
blockSize * 2);
}
}
else {
leftButton.setBounds(-5, -5, 1, 1);
rightButton.setBounds(-5, -5, 1, 1);
}
}
}
public Dimension minimumLayoutSize(Container c) {
// NOTE: This isn't really used, refer to
// BasicSplitPaneDivider.getPreferredSize for the reason.
// I leave it in hopes of having this used at some point.
if (c != BasicSplitPaneDivider.this || splitPane == null) {
return new Dimension(0,0);
}
Dimension buttonMinSize = null;
if (splitPane.isOneTouchExpandable() && leftButton != null) {
buttonMinSize = leftButton.getMinimumSize();
}
Insets insets = getInsets();
int width = getDividerSize();
int height = width;
if (orientation == JSplitPane.VERTICAL_SPLIT) {
if (buttonMinSize != null) {
int size = buttonMinSize.height;
if (insets != null) {
size += insets.top + insets.bottom;
}
height = Math.max(height, size);
}
width = 1;
}
else {
if (buttonMinSize != null) {
int size = buttonMinSize.width;
if (insets != null) {
size += insets.left + insets.right;
}
width = Math.max(width, size);
}
height = 1;
}
return new Dimension(width, height);
}
public Dimension preferredLayoutSize(Container c) {
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