I am trying to get the JScrollPane to scroll at all times in this program. I am also trying to get this to scroll even when the image shrinks after the button is clicked. I can get the scroll pane to scroll only when the JFrame is maximized. Also once the image inside the JScrollPane is reduced by half when clicking on the button the JScrollPane no longer appears. I thought I could have the JScrollPane have the horizontal and vertical scrollbars at all times by making the Panel that holds it much much larger than the JFrame that holds the Panel. Please see the code below and help debug it if possible.
package Ex3;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.IOException;
import java.awt.AWTException;
import javax.swing.JScrollPane;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JFrame;
import java.awt.FlowLayout;
import java.awt.Image;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.BoxLayout;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.BorderLayout;
import java.awt.GridBagLayout;
public class Ex3MF {
JFrame jframe = new JFrame("Crappy Screen Grabber 1.0");
ImageIcon icon = new ImageIcon(this.getClass().getClassLoader().getResource("screenshot-ex3mf.png"));
JLabel jl;
JScrollPane jsp;
Container c = jframe.getContentPane();
JButton button1 = new JButton("Resize Image");
static Ex3MF e;
static Toolkit t = Toolkit.getDefaultToolkit();
static Dimension d = t.getScreenSize();
static int x_width = d.width/2;
static int x_height = d.width/2;
JPanel p1 = new JPanel();
JPanel p2 = new JPanel();
void setupJFrame() {
jframe.setSize(300, 300);
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jframe.setLocationRelativeTo(null);
button1.addActionListener(new TrimImage());
p2.setSize(200,100);
//p2.setLayout(new BorderLayout());
p2.add(button1);
jframe.add(p2, BorderLayout.NORTH);
}
void image2ScrollPane(ImageIcon ic) {
setupJFrame();
p1.setSize(3000,3000);
p1.setLayout(new BorderLayout());
if (jl == null) {
jl = new JLabel("Crappy Screencapture", ic, JLabel.CENTER);
} else {
jl.setIcon(ic);
}
if (jsp == null) {
jsp = new JScrollPane(jl);
} else {
jsp.setViewportView(jl);
}
p1.add(jsp);
//c.add(p1);
//p1.add(jl); //and the jlabel to the panel
// jsp = new JScrollPane(p1); //and the panel to the ScrollPane
// c.add(jsp); //add the JScrollPane to the Container
jframe.add(p1, BorderLayout.CENTER);
jframe.setVisible(true);
jframe.pack();
}
void createScreenCapture() {
try {
Robot ro = new Robot();
Toolkit t = Toolkit.getDefaultToolkit();
final Dimension d = t.getScreenSize();
Rectangle re = new Rectangle(d.width, d.height);
BufferedImage image = ro.createScreenCapture(re);
//write screen capture to disk
ImageIO.write(image, "png", new File("screenshot-ex3mf.png"));
} catch(IOException ioe) {
System.out.println("IOException thrown " + ioe);
}
catch(AWTException awte) {
System.out.println("AWTException thrown " + awte);
}
}
ImageIcon resizeTheCapture() {
Image image = icon.getImage();
x_width = x_width / 2;
x_height = x_height / 2;
Image newimg = image.getScaledInstance((x_width), (x_height), java.awt.Image.SCALE_SMOOTH);
return new ImageIcon(newimg);
}
public static void main(String[] args) {
e = new Ex3MF();
e.createScreenCapture();
e.image2ScrollPane(e.icon);
System.out.println("\nProgram complete...");
}
} //end class
The code that controls the button follows this sentence.
package Ex3;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class TrimImage implements ActionListener {
public void actionPerformed(ActionEvent ae) {
Ex3MF ex3 = new Ex3MF();
ex3.e.image2ScrollPane(ex3.e.resizeTheCapture());
}
}
Thank-you for reading all of this. I appreciate any annoying snobby comments given and also any actual help towards making me a better programmer and other people across the world better programmers that are reading this after searching in their favorite search engine. :)
