corejava第10版
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package internalFrame;
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import java.awt.*;
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import java.beans.*;
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import javax.swing.*;
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/**
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* This desktop frame contains editor panes that show HTML documents.
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*/
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public class DesktopFrame extends JFrame
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{
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private static final int DEFAULT_WIDTH = 600;
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private static final int DEFAULT_HEIGHT = 400;
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private static final String[] planets = { "Mercury", "Venus", "Earth", "Mars", "Jupiter",
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"Saturn", "Uranus", "Neptune", "Pluto", };
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private JDesktopPane desktop;
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private int nextFrameX;
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private int nextFrameY;
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private int frameDistance;
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private int counter;
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public DesktopFrame()
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{
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setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
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desktop = new JDesktopPane();
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add(desktop, BorderLayout.CENTER);
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// set up menus
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JMenuBar menuBar = new JMenuBar();
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setJMenuBar(menuBar);
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JMenu fileMenu = new JMenu("File");
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menuBar.add(fileMenu);
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JMenuItem openItem = new JMenuItem("New");
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openItem.addActionListener(event ->
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{
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createInternalFrame(new JLabel(
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new ImageIcon(getClass().getResource(planets[counter] + ".gif"))),
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planets[counter]);
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counter = (counter + 1) % planets.length;
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});
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fileMenu.add(openItem);
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JMenuItem exitItem = new JMenuItem("Exit");
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exitItem.addActionListener(event -> System.exit(0));
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fileMenu.add(exitItem);
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JMenu windowMenu = new JMenu("Window");
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menuBar.add(windowMenu);
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JMenuItem nextItem = new JMenuItem("Next");
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nextItem.addActionListener(event -> selectNextWindow());
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windowMenu.add(nextItem);
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JMenuItem cascadeItem = new JMenuItem("Cascade");
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cascadeItem.addActionListener(event -> cascadeWindows());
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windowMenu.add(cascadeItem);
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JMenuItem tileItem = new JMenuItem("Tile");
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tileItem.addActionListener(event -> tileWindows());
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windowMenu.add(tileItem);
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final JCheckBoxMenuItem dragOutlineItem = new JCheckBoxMenuItem("Drag Outline");
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dragOutlineItem.addActionListener(event ->
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desktop.setDragMode(dragOutlineItem.isSelected() ? JDesktopPane.OUTLINE_DRAG_MODE
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: JDesktopPane.LIVE_DRAG_MODE));
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windowMenu.add(dragOutlineItem);
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}
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/**
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* Creates an internal frame on the desktop.
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* @param c the component to display in the internal frame
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* @param t the title of the internal frame
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*/
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public void createInternalFrame(Component c, String t)
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{
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final JInternalFrame iframe = new JInternalFrame(t, true, // resizable
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true, // closable
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true, // maximizable
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true); // iconifiable
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iframe.add(c, BorderLayout.CENTER);
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desktop.add(iframe);
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iframe.setFrameIcon(new ImageIcon(getClass().getResource("document.gif")));
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// add listener to confirm frame closing
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iframe.addVetoableChangeListener(event ->
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{
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String name = event.getPropertyName();
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Object value = event.getNewValue();
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// we only want to check attempts to close a frame
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if (name.equals("closed") && value.equals(true))
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{
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// ask user if it is ok to close
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int result = JOptionPane.showInternalConfirmDialog(iframe, "OK to close?",
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"Select an Option", JOptionPane.YES_NO_OPTION);
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// if the user doesn't agree, veto the close
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if (result != JOptionPane.YES_OPTION) throw new PropertyVetoException(
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"User canceled close", event);
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}
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});
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// position frame
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int width = desktop.getWidth() / 2;
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int height = desktop.getHeight() / 2;
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iframe.reshape(nextFrameX, nextFrameY, width, height);
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iframe.show();
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// select the frame--might be vetoed
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try
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{
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iframe.setSelected(true);
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}
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catch (PropertyVetoException ex)
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{
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}
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frameDistance = iframe.getHeight() - iframe.getContentPane().getHeight();
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// compute placement for next frame
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nextFrameX += frameDistance;
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nextFrameY += frameDistance;
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if (nextFrameX + width > desktop.getWidth()) nextFrameX = 0;
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if (nextFrameY + height > desktop.getHeight()) nextFrameY = 0;
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}
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/**
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* Cascades the noniconified internal frames of the desktop.
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*/
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public void cascadeWindows()
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{
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int x = 0;
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int y = 0;
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int width = desktop.getWidth() / 2;
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int height = desktop.getHeight() / 2;
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for (JInternalFrame frame : desktop.getAllFrames())
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{
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if (!frame.isIcon())
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{
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try
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{
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// try to make maximized frames resizable; this might be vetoed
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frame.setMaximum(false);
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frame.reshape(x, y, width, height);
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x += frameDistance;
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y += frameDistance;
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// wrap around at the desktop edge
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if (x + width > desktop.getWidth()) x = 0;
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if (y + height > desktop.getHeight()) y = 0;
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}
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catch (PropertyVetoException ex)
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{
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}
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}
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}
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}
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/**
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* Tiles the noniconified internal frames of the desktop.
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*/
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public void tileWindows()
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{
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// count frames that aren't iconized
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int frameCount = 0;
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for (JInternalFrame frame : desktop.getAllFrames())
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if (!frame.isIcon()) frameCount++;
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if (frameCount == 0) return;
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int rows = (int) Math.sqrt(frameCount);
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int cols = frameCount / rows;
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int extra = frameCount % rows;
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// number of columns with an extra row
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int width = desktop.getWidth() / cols;
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int height = desktop.getHeight() / rows;
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int r = 0;
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int c = 0;
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for (JInternalFrame frame : desktop.getAllFrames())
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{
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if (!frame.isIcon())
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{
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try
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{
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frame.setMaximum(false);
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frame.reshape(c * width, r * height, width, height);
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r++;
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if (r == rows)
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{
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r = 0;
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c++;
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if (c == cols - extra)
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{
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// start adding an extra row
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rows++;
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height = desktop.getHeight() / rows;
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}
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}
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}
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catch (PropertyVetoException ex)
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{
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}
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}
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}
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}
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/**
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* Brings the next noniconified internal frame to the front.
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*/
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public void selectNextWindow()
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{
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JInternalFrame[] frames = desktop.getAllFrames();
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for (int i = 0; i < frames.length; i++)
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{
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if (frames[i].isSelected())
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{
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// find next frame that isn't an icon and can be selected
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int next = (i + 1) % frames.length;
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while (next != i)
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{
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if (!frames[next].isIcon())
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{
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try
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{
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// all other frames are icons or veto selection
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frames[next].setSelected(true);
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frames[next].toFront();
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frames[i].toBack();
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return;
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}
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catch (PropertyVetoException ex)
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{
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}
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}
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next = (next + 1) % frames.length;
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}
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}
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}
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}
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}
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