Re: moveable sizeable text box

From:
Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups:
comp.lang.java.programmer
Date:
Sat, 19 Apr 2008 21:22:32 -0700
Message-ID:
<480ac507$0$6966$b9f67a60@news.newsdemon.com>
RichT wrote:

A window without title bar probably cannot be resized.

boo ;) I thought this may be the case, what a shame thoughcould have
been a quick reasonable solution.

OK so what you are really trying to do is to draw text on an image and
you need the GUI part to accomplish that, yes?

Yes :)

So you really will have a couple of problems to solve, first how to
position the text on the image


I have an dear how to achieve this, if I make the dialog a listener to
the mouse, when I have focus of the coords text box on the dialog, I
could click a positon in the image and populate the coords text box from
the mouse coords yes?
and then how to get the text in the first

place. Your idea of using a moveable/resizable text box probably
won't work well as you want.

:( my ideas rarely do exactly as I had imagined.
Why not have the user select from a menu the

option to draw text on the image, then draw a line box on the image as
the placement area and make that box movable/resizable and pop up a
dialog to enter the text into.

I am unfamiliar with a line box, I would still like to have the text
displayed before it is committed to the image.

As text is entered into the dialog you

can draw it in the image box and you will be able to position it as
well. I know that this sounds pretty complicated but I don't think it
will really be that hard to do.

I oly really want to draw into the image just before saving, I really
want a place holder as you describe earlier for each piece of text, yes
there could be several pieces of text to render.

I already have he idea for multiple text boxes, I could use an arraylist
or similar and then iterate over it before saving to draw ach piece of
text.

Thanks for your help so far
Rich


Here is a simple example of what I am suggesting. You can make
selections for color, font and size if you wanted too. This is similar
to the text box on the Gimp image program.

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
import javax.swing.*;
import javax.swing.event.*;

public class AddTextJComponent extends JComponent implements
ActionListener {
     final BufferedImage image;
     final JTextField tf = new JTextField(20);
     final Rectangle rect;
     final JDialog dialog;
     boolean drawRect;
     boolean moveFlag;
     int startX,startY;

     public AddTextJComponent() throws IOException {
         image = ImageIO.read(new File("kittens.jpg"));
         setPreferredSize(new Dimension(
           image.getWidth(),image.getHeight()));

         MouseInputAdapter mia = new MouseInputAdapter() {
             public void mousePressed(MouseEvent me) {
                 Point p = new Point(me.getX(),me.getY());
                 if (rect.contains(p)) {
                     moveFlag = true;
                     startX = rect.x;
                     startY = rect.y;
                 }
             }
             public void mouseReleased(MouseEvent me) {
                 moveFlag = false;
                 dialog.toFront();
             }
             public void mouseDragged(MouseEvent me) {
                 if (moveFlag) {
                     rect.x = me.getX();
                     rect.y = me.getY();
                     repaint();
                 }
             }
         };

         addMouseListener(mia);
         addMouseMotionListener(mia);

         DocumentListener dl = new DocumentListener() {
             public void changedUpdate(DocumentEvent de) {
                 change(de);
             }
             public void insertUpdate(DocumentEvent de) {
                 change(de);
             }
             public void removeUpdate(DocumentEvent de) {
                 change(de);
             }
             void change(DocumentEvent de) {
                 repaint();
             }
         };

         tf.getDocument().addDocumentListener(dl);

         rect = new Rectangle();

         dialog = new JDialog((Frame)getTopLevelAncestor(),
          "Enter Text",false);
         dialog.addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent we) {
                 drawRect = false;
                 repaint();
             }
         });
         dialog.add(tf);
         dialog.pack();
     }

     public void actionPerformed(ActionEvent ae) {
         drawRect = true;
         dialog.setVisible(true);
     }

     public void paintComponent(Graphics g) {
         g.drawImage(image,0,0,null);

         g.setColor(Color.BLUE);

         FontMetrics fm = g.getFontMetrics();
         int textWidth = fm.stringWidth(tf.getText());
         int textHeight = fm.getHeight();

         g.drawString(tf.getText(),rect.x + 5,rect.y + textHeight);

         // adjust the size of the rectangle for the amount of text
         rect.setSize(new Dimension(textWidth + 10, textHeight + 10));

         if (drawRect)
             g.drawRect(rect.x,rect.y,rect.width,rect.height);
     }

     public static void main(String[] args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 try {
                     JFrame f = new JFrame();
                     f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                     AddTextJComponent comp = new AddTextJComponent();
                     f.add(comp);
                     JMenuBar mb = new JMenuBar();
                     f.setJMenuBar(mb);
                     JMenuItem m = new JMenuItem("Text");
                     mb.add(m);
                     m.addActionListener(comp);
                     f.pack();
                     f.setVisible(true);
                 } catch (IOException ioe) {
                     ioe.printStackTrace();
                 }
             }
         });
     }
}

--

Knute Johnson
email s/nospam/linux/

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