basicsplitpanedivider.java

JAVA 所有包

                add(rightButton);
            }
        }
        revalidate();
    }


    /**
     * 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.
     * <p>
     */
    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<sup><font size="-2">TM</font></sup>
     * 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 -