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package com.darwinsys.swingui;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.util.prefs.Preferences;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
/** Utilities for GUI work.
*/
// tag::main[]
// package com.darwinsys.swingui;
public class UtilGUI {
/** Centre a Window, Frame, JFrame, Dialog, etc.
* @param w The window
*/
public static void centre(final Window w) {
// After packing a Frame or Dialog, centre it on the screen.
Dimension us = w.getSize(),
them = Toolkit.getDefaultToolkit().getScreenSize();
int newX = (them.width - us.width) / 2;
int newY = (them.height- us.height)/ 2;
w.setLocation(newX, newY);
}
/** Center a Window, Frame, JFrame, Dialog, etc.,
* but do it the American Spelling Way :-)
* @param w The window
*/
public static void center(final Window w) {
UtilGUI.centre(w);
}
/** Maximize a window, the hard way.
* @param w The Window instance
*/
public static void maximize(final Window w) {
Dimension them =
Toolkit.getDefaultToolkit().getScreenSize();
w.setBounds(0,0, them.width, them.height);
}
/**
* Copy a string value to the system copy buffer
* @param c The The component
* @param srcData The data to copy
*/
public static void setSystemClipboardContents(Component c, String srcData) {
if (srcData != null) {
Clipboard clipboard = c.getToolkit().getSystemClipboard();
StringSelection contents = new StringSelection(srcData);
clipboard.setContents(contents, new ClipboardOwner() {
public void lostOwnership(Clipboard clipboard,
Transferable contents) {
// don't care
}
});
}
}
/** Print a yes/no prompt; return true if the user presses yes
* @param parent The parent frame
* @param message The prompt string
* @return True if they confirmed the message
*/
public static boolean confirm(JFrame parent, String message) {
int confirm = JOptionPane.showConfirmDialog(parent, message, "Confirm",
JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE);
// Only selecting Yes choice will result in true
return confirm == 0;
}
/** Save the X and Y locations in Preferences node provided.
* @param pNode The Prefs node for the location
* @param w The window whose location is to be saved
*/
public static void setSavedLocation(
final Preferences pNode, final Window w) {
Point where = w.getLocation();
int x = (int)where.getX();
pNode.putInt("mainwindow.x", Math.max(0, x));
int y = (int)where.getY();
pNode.putInt("mainwindow.y", Math.max(0, y));
}
/** Retrieve the saved X and Y from Preferences
* @param pNode The Preferences node to hold the location
* @return The saved location
*/
public static Point getSavedLocation(final Preferences pNode) {
int savedX = pNode.getInt("mainwindow.x", -1);
int savedY = pNode.getInt("mainwindow.y", -1);
return new Point(savedX, savedY);
}
/**
* Track a Window's position across application restarts; location is saved
* in a Preferences node that you pass in; we attach a ComponentListener to
* the Window.
* @param w The Window itself
* @param pNode The preferences node to hold the location
*/
public static void monitorWindowPosition(
final Window w, final Preferences pNode) {
// Get the current saved position, if any
Point p = getSavedLocation(pNode);
int savedX = (int)p.getX();
int savedY = (int)p.getY();
if (savedX != -1) {
// Move window to is previous location
w.setLocation(savedX, savedY);
} else {
// Not saved yet, at least make it look nice
centre(w);
}
// Now make sure that if the user moves the window,
// we will save the new position.
w.addComponentListener(new ComponentAdapter() {
@Override
public void componentMoved(ComponentEvent e) {
setSavedLocation(pNode, w);
}
});
}
}
// end::main[]
