Witam wszystkich,
Mój problem jest zapewne dosyć trywialny, ale jestem początkującym dlatego proszę o wyrozumiałość. Jednocześnie z góry dziękuję za każdą sugestię i uwagę.
Mam dwie klasy, pierwsza GUI.java zawiera interfejs graficzny, ot zwykły JFrame z jednym Panelem i dwoma buttonami. Drugą pobrałem ze strony oracle'a (http://docs.oracle.com/javase/tutorial/uiswing/components/combobox.html) - to ta o nazwie CustomComboBox.java. Klasa ta, wyświetla zdjęcia zwierzątek. Dodałem ją na JPanel i wszystko działa poprawnie. Wygląda tak:
Problem w tym, że chciałbym za pomocą buttonów zmieniać ścieżkę dostępu do tych obrazków. W klasie CustomComboBox tworzę scieżkę tak:
String path = "images/";
(...)
images[i] = createImageIcon(path + petStrings[i] + ".gif");
I właśnie w klasie GUI, w metodach obsługujących buttony chciałbym zmieniać wartość tego stringa path. Jak to poprawnie zrobić? Poniżej zamieszczam kod źródłowy dla obydwu klas.
pozdrawiam,
Remi
CustomComboBox.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CustomComboBoxDemo extends JPanel {
ImageIcon[] images;
String[] petStrings = {"1", "2", "3"};
String path = "images/";
public CustomComboBoxDemo() {
super(new BorderLayout());
//Load the pet images and create an array of indexes.
images = new ImageIcon[petStrings.length];
Integer[] intArray = new Integer[petStrings.length];
for (int i = 0; i < petStrings.length; i++) {
intArray[i] = new Integer(i);
images[i] = createImageIcon(path + petStrings[i] + ".gif");
if (images[i] != null) {
images[i].setDescription(petStrings[i]);
}
}
//Create the combo box.
JComboBox FacePartList = new JComboBox(intArray);
ComboBoxRenderer renderer= new ComboBoxRenderer();
renderer.setPreferredSize(new Dimension(250, 250));
FacePartList.setRenderer(renderer);
FacePartList.setMaximumRowCount(3);
//Lay out the demo.
add(FacePartList, BorderLayout.PAGE_START);
setBorder(BorderFactory.createEmptyBorder(2,2,2,2));
}
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = CustomComboBoxDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
class ComboBoxRenderer extends JLabel
implements ListCellRenderer {
private Font uhOhFont;
public ComboBoxRenderer() {
setOpaque(true);
setHorizontalAlignment(CENTER);
setVerticalAlignment(CENTER);
}
/*
* This method finds the image and text corresponding
* to the selected value and returns the label, set up
* to display the text and image.
*/
public Component getListCellRendererComponent(
JList list,
Object value,
int index,
boolean isSelected,
boolean cellHasFocus) {
//Get the selected index. (The index param isn't
//always valid, so just use the value.)
int selectedIndex = ((Integer)value).intValue();
if (isSelected) {
setBackground(list.getSelectionBackground());
setForeground(list.getSelectionForeground());
} else {
setBackground(list.getBackground());
setForeground(list.getForeground());
}
//Set the icon and text. If icon was null, say so.
ImageIcon icon = images[selectedIndex];
String pet = petStrings[selectedIndex];
setIcon(icon);
if (icon != null) {
setText(pet);
setFont(list.getFont());
} else {
setUhOhText(pet + " (no image available)",
list.getFont());
}
return this;
}
//Set the font and text when no image was found.
protected void setUhOhText(String uhOhText, Font normalFont) {
if (uhOhFont == null) { //lazily create this font
uhOhFont = normalFont.deriveFont(Font.ITALIC);
}
setFont(uhOhFont);
setText(uhOhText);
}
}
}
GUI.java
import javax.swing.ComboBoxModel;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class GUI extends JFrame {
/** Constructor */
public GUI() {
initComponents();
}
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(3);
// combobox layout
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(
jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(jPanel1Layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 266,
Short.MAX_VALUE).addComponent(combobox));
jPanel1Layout.setVerticalGroup(jPanel1Layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 274,
Short.MAX_VALUE).addComponent(combobox));
// end combobox layout
jButton1.setText("jButton1");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("jButton2");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(
getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(layout
.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
javax.swing.GroupLayout.Alignment.TRAILING,
layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1,javax.swing.GroupLayout.PREFERRED_SIZE,javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED,49, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jButton1)
.addComponent(jButton2))
.addContainerGap()));
layout.setVerticalGroup(layout
.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
layout.createSequentialGroup()
.addGap(67, 67, 67)
.addComponent(jButton1)
.addPreferredGap(
javax.swing.LayoutStyle.ComponentPlacement.RELATED,
94, Short.MAX_VALUE)
.addComponent(jButton2).addGap(89, 89, 89))
.addGroup(
layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE).addContainerGap()));
pack();
}// end:initComponents
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
//main
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new GUI().setVisible(true);
}
});
}
// Variables declaration
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JPanel jPanel1;
// End of variables
}