Zooming a Jpanel that contains Jbutton

My question is how to zoom a jpanel that contains several jbutton... I am not sure what method to use.... when using a Graphics2D object there seem to be only methods as g.drawString(...)
g.drawRectangle(..) etc... I am kind of familiar with
AffineTransform, scaling matrix, etc but not how to zoom a jpanel with jcomponent...
I hope some one out there understand what i am trying to do...please could you give me any idea
thanx

Hello.
The solution could be the following:
1. Create interface ZoomPane with the following methods:
boolean isZoomMode
float getZoomFactor
2. ZoomPane interface must be implemented by some JComponent (JPanel will fit, assume it's called JZoomPanel)
3. the paint method's body of the JZoomPanel should looks like:
Graphics2D g2 = (Graphics2D)g;
if(isZoomMode()){
float zoomFactor = getZoomFactor();
g2.scale(zoomFactor, zoomFactor);
super.paint(g);
4. Use updated RepaintManager.
This solution solve all painting problem. The mouse event transformation problem can be solved as described above (by means of the glass pane).

Similar Messages

Zooming a jpanel containing several jbuttons

My question is how to zoom a jpanel that contains several jbutton... I am not sure what method to use.... when using a Graphics2D object there seem to be only methods as g.drawString(...)
g.drawRectangle(..) etc... I am kind of familiar with
AffineTransform, scaling matrix, etc but not how to zoom a jpanel with jcomponent...
I hope some one out there understand what i am trying to do...please could you give me any idea
thanx

hi again
well that is the point i have written such sub class where i draw a rectangle and then I scale it etc..
to test paint () etc but that is what i do not want to ....
what I want to do is to draw is my subclass of Jbutton that has some specific properties I HAVE TO USE THEM... and only zoom these specific button and not everything else on my subclass of Jpanel...
Spanel extends JPanel
MybuttonClass m = new MybuttonClass();
paint()
how do I draw the myButton on the panel...after zooming in zoomin out...
there no such thing
g.draw(myButton);
does all this make a sense to you..
i hope so
thanx

PropertyChangeListener for a JButton that contains a JPanel?

I created a class that extends from the JButton class. The class contains a JPanel that adds two components to the panel, A JLabel that contains text and a JLabel that contains an icon. Therefore this class is really just a button that contains a JPanel with 2 JLabels added to the panel. (Reason for doing this is it adds layout control to add the 2 components to a panel instead of directly to the JButton) Normally you would do a changepropertylistener to the JButton but because I added the 2 components (JLabel) to a panel and then added the JPanel to the button, the button doesn't notice any change events. How would I detect the PropertyChangeEvent for this cenario?
thanks,
Peter Landis

The solution to the problem is when the instance of the class is created, do a getComponent(0) to get the JPanel component and the do a getComponent(0) to get the JLabel component. Now from here you can add a PropertyChangeListener to the JLabel that you just obtained. The PropertyChangeListener class will look like:
class RotorItemListener implements PropertyChangeListener
public void propertyChange(PropertyChangeEvent e)
System.out.println("CHANGE");
String name = e.getPropertyName();
if(name == "text")
System.out.println("Label changed");
This will only trap a change that occurs when the label has changed. If you omit the if(name == "text") then when the component is created, a property change event will be triggered which is not what you want. This only traps event that occur only when a change has occurred on the JLabel. Notice that during the instantiation of the component you'll see the text displayed "CHANGE" and not the "Label changed" until the label text has changed.
Pretty cool huh!

JPanel that close the parent JFrame

Hello.
I'm puzzled... how can I close a JFrame from the JPanel it contains?
I mean:
I have a Form that extends JFrame. In this form there's a JPanel, which has a BorderLayout. In the South part of the BorderLayout there's a JPanel (BoxLayout) that contains a JButton.
I'd like this JButton to get disposed of the Form.
How should I?
Is there a better way to manage with this?
(putting the button somewhere else...)
Thank you

Sorry, I forgot to mention that my sub-panel is in another class, another file.
So I don't know how to call the parent frame.
I tried with some .getParent(), but I get
JPanel
JLayerPane
JRootPane
and no JFrame.
I could just put everything into 1 single class (or inner classes at least), but if there's a chance to keep them in different files, I would be glad to learn about it :)
Thank you.

FlowLayout in JPanels, and Container

I set the FlowLayout alignment to RIGHT justify on my Container. I also want to control individual FlowLayouts in JPanels that are added to the Container. I want some panels to be center, and others LEFT or LEADING alignments, etc.
So far everything I try on the JPanel LayoutManager Alignment has no effect. Only the changes I make to the Container layout alignment have an effect. All of the JPanels are RIGHT justified when I run this program.
          rightLayout = new FlowLayout();
          rightLayout.setAlignment(FlowLayout.RIGHT);
          centerLayout = new FlowLayout();
          centerLayout.setAlignment(FlowLayout.CENTER);
          leftLayout = new FlowLayout();
          leftLayout.setAlignment(FlowLayout.LEADING);
          container.setLayout(rightLayout);
          titlePanel = new JPanel(centerLayout);
          twoPanel = new JPanel();
          threePanel = new JPanel(leftLayout);
          fourPanel = new JPanel();
          text1Panel = new JPanel(centerLayout);
          text2Panel = new JPanel(centerLayout);
          buttonPanel = new JPanel(centerLayout);
Thanks, rjw

Okay i think that to use GrisBagLayout takes away all the hastle,you can get things where you want them,
i think people don't use cause it seems like it's more complex to use,if you put this helper method in your code then you only need one line in your code to place a component.
This is the line of code to place a component
        addComp(theButton,theContainer,gb1,gbc,      0,1,1,1,1,1,gbc.WEST);Place this at the start of your CODE also
         GridBagLayout gb1 = new GridBagLayout();
         GridBagConstraints gbc = new GridBagConstraints();
         setLayout(gb1);/*
     * This is a helper method for GridBagConstraint Layout
     public void addComp(Component comp,Container cont, GridBagLayout gb1,GridBagConstraints gbc,
                    int row,int col, int numRows, int numCols, double weightx, double weighty,int theAnchor)
          gbc.gridx = col;
          gbc.gridy = row;
          gbc.gridwidth = numCols;
          gbc.gridheight = numRows;
          gbc.weightx = weightx;
          gbc.weighty = weighty;
                                           gbc.anchor = theAnchor
          cont.add(comp,gbc);
     }If you try and understand and it's not quite hard then it makes GUI building a lot easier and more efficient i think,let me know if you give this a go.

Listener of a JPanel that listens to events of its components

Is there a listener (that I can add to a JPanel) that listens to events generated by the panel's components?
Award: 2 duke stars

Well it ought to.
If you need further help then you need to create a [url http://homepage1.nifty.com/algafield/sscce.html]Short, Self Contained,
Compilable and Executable, Example Program that demonstrates the
incorrect behaviour, because I can't guess exactly what you are doing
based on the information provided.
And don't forget to use the [url http://forum.java.sun.com/help.jspa?sec=formatting]Code Formatting Tags so the code retains its
original formatting.

Extending JPanel to contain a JRootPane - problems with scroll panes

I am trying to write a JPanel subclass that contains a JRootPane, similar to the way that JFrame contains a JRootPane. The reason that I am doing this is that I would like to be able to intercept mouse events using the JGlassPane facility, but adding the glasspane to the JFrame is problematic since it then intercepts mouse events over all components in the JFrame, including the menu bar. It seems simpler to me to have the JRootPane owned by a JPanel, to give me better control over intercepting events. I've got an implementation working with the JFrame case, but have had to handle many small "gotchas", and at least one more exists. I'm hoping to simplify things by moving away from this way of doing things.
I wrote a straightforward RootPanePanel class that extends JPanel and implements RootPaneContainer, delegating all of the add methods to the JRootPane's content pane. Here's the constructor for RootPanePanel:
public RootPanePanel (LayoutManager layout) {
        rootPane = new JRootPane ();
        rootPane.setOpaque(true);
        rootPane.getContentPane().setLayout(layout);
        super.add (rootPane);
}RootPanePanel also delegates calls like getContentPane/setContentPane to the JRootPane.
To test my implementation, I wrote a main method that looks like the following:
public static void main (String[] args) {
SwingUtilities.invokeLater(new Runnable () {
    public void run () {
      try {
        JEditorPane editorPane = new JEditorPane ("http://www.archives.gov/exhibits/charters/print_friendly.html?page=declaration_transcript_content.html&title=NARA%20%7C%20The%20Declaration%20of%20Independence%3A%20A%20Transcription");
        JScrollPane scrollPane = new JScrollPane (editorPane);
        JFrame frame = new JFrame ("Test RootPanePanel");
        RootPanePanel panel = new RootPanePanel ();
        panel.add(scrollPane);
        frame.add(panel, BorderLayout.CENTER);
        scrollPane.setPreferredSize(new Dimension(800, 600));
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize (640, 480);
        frame.pack ();
        frame.setVisible(true);
      } catch (Exception e) {
        e.printStackTrace();
});Note that I'm not actually using JEditorPane in my application, but it is the simplest component that displays the problem I'm encountering.
When this code runs, it is fine, as long as the JFrame is big enough to display the scrollbars for the JScrollPane. If the JFrame is made small enough, the scrollbars are not displayed.
If I instead add the JScrollPane to the JFrame directly, it behaves as you would expect.
Is this a problem of mixing heavyweight and lightweight components? It doesn't seem like it should be; in both cases the JScrollPane is handling the same client component, the JEditorPane.
Any suggestions/ideas are welcome!

Here's the full RootPanePanel class in case people want to try it out
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.HeadlessException;
import java.awt.LayoutManager;
import java.io.IOException;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
import javax.swing.JRootPane;
import javax.swing.JScrollPane;
import javax.swing.RootPaneContainer;
import javax.swing.SwingUtilities;
public class RootPanePanel extends JPanel implements RootPaneContainer {
     private JRootPane rootPane;
     public RootPanePanel () {
          this (new BorderLayout());
     public RootPanePanel (LayoutManager layout) {
          rootPane = new JRootPane ();
          rootPane.setOpaque(true);
          rootPane.getContentPane().setLayout(layout);
          super.add (rootPane);
     public Container getContentPane() {
          return rootPane.getContentPane();
     public Component getGlassPane() {
          return rootPane.getGlassPane();
     public JLayeredPane getLayeredPane() {
          return rootPane.getLayeredPane();
     public void setContentPane(Container arg0) {
          rootPane.setContentPane(arg0);
     public void setGlassPane(Component arg0) {
          rootPane.setGlassPane(arg0);
     public void setLayeredPane(JLayeredPane arg0) {
          rootPane.setLayeredPane(arg0);
     @Override
     protected void addImpl(Component comp, Object constraints, int index)
          if (comp == rootPane) {
               super.addImpl(comp, constraints, index);
          else {
               getContentPane().add(comp, constraints, index);
     @Override
     public Component add(Component comp, int index) {
          return rootPane.getContentPane().add(comp, index);
     @Override
     public void add(Component comp, Object constraints, int index) {
          rootPane.getContentPane().add(comp, constraints, index);
     @Override
     public void add(Component comp, Object constraints) {
          rootPane.getContentPane().add(comp, constraints);
     @Override
     public Component add(Component comp) {
          return rootPane.getContentPane().add(comp);
     @Override
     public Component add(String name, Component comp) {
          return rootPane.getContentPane().add(name, comp);
     public static void main (String[] args) {
          SwingUtilities.invokeLater(new Runnable () {
               public void run () {
                    try {
                         JEditorPane editorPane = new JEditorPane ("http://www.archives.gov/exhibits/charters/print_friendly.html?page=declaration_transcript_content.html&title=NARA%20%7C%20The%20Declaration%20of%20Independence%3A%20A%20Transcription");
                         JScrollPane scrollPane = new JScrollPane (editorPane);
                         JFrame frame = new JFrame ("Test RootPanePanel");
                         RootPanePanel panel = new RootPanePanel ();
                         panel.add(scrollPane);
                         frame.add(panel, BorderLayout.CENTER);
                         scrollPane.setPreferredSize(new Dimension(800, 600));
                         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                         frame.setSize (640, 480);
                         frame.pack ();
                         frame.setVisible(true);
                    } catch (HeadlessException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                    } catch (IOException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
     public JRootPane getRootPane() {
          return rootPane;
}

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How can I list all folders that contain files with a specific file extension? I want a list that shows the parent folders of all files with a .nef extension.

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Zooming a Jpanel that contains Jbutton

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