I have three classes one JFrame class and two JPanel classes. I have added the intial JPanel to the JFrame like so
public JFrame() {
add(new 1stPanel(this));
setVisible(true);
setLayout(null);
}
Then i want to use an actionlistener on a button in the 1st panel to remove it and add the other panel which is in another class. I tried giving each class a variable and using the simple remove() and add() like this:
private 1stpanel 1p;
private 2ndpanel 2p;
btn.addActionListener((new ActionListener(){
public void actionPerformed(ActionEvent e)
{
remove(1p);
add(2p);
validate();
repaint();
}
}));
that doesn't work i have also tried using JFrame.remove(1p) but that doesn't work either. When i do removeAll() it gets rid of everything in the 1stpanel JPanel but then i can't add the 2ndpanel.
What code can i use to take out the 1st panel or 1stpanel class and add the 2nd panel which is in another class.
Thanks for the help in advance.
Try to use CardLayout and swap cards (panels).
Could be you problem is the creation add(new 1stPanel(this)). You add a local variable but then use fields of class.
your code lines
remove(1p);
add(2p);
validate();
repaint();
which you are calling inside the action listener are being called on the this object which I suspect is the JPanel itself. If it is so define a method in the class that is extending the JFrame, place these codes inside that method, and on action event call that method.
Related
In my btcFrame class I have the method
private void closeButtonMouseClicked(MouseEvent evt){
this.dispose();
}
In my BtcTitleBarPanel I have in button for that I tend to close the frame. In the constructor I am adding my listener to closeButton like below.
closeButton.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent evt){
closeButtonMouseClicked(evt);
}
});
Problem is I cannot reach closeButtonMouseClicked method within the panel. How should I be doing to solve this?
Images in case.
Methods from jframe
Methods in jpanel
I would add a getter within the Panel for the closeButton. After initializing the Panel in the frame I would add the listener to button within the Frame. Like, btcPanel.getCloseButton().addActionListener(new ...); and within this action listener you could close the frame, like btcFrame.this.dispose()
Though I am not sure if that is a good practise, I almost always create new classes for listening events, but in this case of yours maybe helpful.
PS(Out of topic): You should see how to name classes and methods, your
naming style is wrong.(i.e classes starts with Capital etc.)
I am attempting to write a simple program for now but the actual JButton is not appearing for some reason, here is my code below.
import javax.swing.*;
import java.awt.*;
public class Test extends JFrame {
public static void main(String[] args) {
JFrame window = new JFrame("Shoes");
window.setDefaultCloseOperation(EXIT_ON_CLOSE);
window.setResizable(true);
window.setSize(400,500);
window.setVisible(true);
window.setLocationRelativeTo(null);
JButton welcome = new JButton("Click here");
welcome.setLocation(100,100);
welcome.setVisible(true);
// doesn't work, but is there another way to make it so?
//add(welcome);
}
}
You created the button, but did not add it.
You have to add it to the window. Simply using add(welcome) will add it to your frame, which you extend, but not to the window in which you want it to show.
Instead of:
add(welcome);
Just do:
window.add(welcome);
I would also like to mention that the reason the code on your commented out section didnt work, is because you're extending JFrame.
When you extend JFrame, you inherit all of the methods JFrame has. That includes add(). However, when you use this.add() you are adding the compononent to you Test Object (which is also a JFrame), not your window JFrame.
To add to the window you would use window.add(welcome);
To stop these weird confusions in the future I would also change
public class Test extends JFrame
to
public class Test
you extended JFrame yet in your code you use another JFrame that you created JFrame window = new JFrame("Shoes");, this is why add(welcome); is not working for you... since its trying to add the JButton to this instance of your Test class(which is not visible) and not the window you have created.
You have 2 ways of solving this:
The first one as mentioned by #Hackerdarshi is to add the button to the window you created. like : window.add(welcome);
The second way is to make use of your extension of the JFrame class(otherwhise why extend at all) and call all the methods on the window using this instance of your Test class:
public Test() {
super("Shoes");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setResizable(true);
setSize(400,500);
setVisible(true);
setLocationRelativeTo(null);
JButton welcome = new JButton("Click here");
welcome.setLocation(100,100);
welcome.setVisible(true);
// this will work since `this` instance is set to visible
add(welcome);
}
NOTE that to set the buttons location like: welcome.setLocation(100,100); you should use a null Layout
I am trying to make hover effect on multiple images in Swing using graphics, I know this can be done by using CSS but confused to make this effect in Java, can anybody help me?
Yes, it is quite possible to do that.
Assume you have a JPanel with an image inside it that you want to change every time the user hovers over it. The code would be something like this:
JPanel panel = new JPanel(); // create a JPanel
this.setupGI(panel); // prepare your background
panel.addMouseListener(new MouseHandler()); // add a listener
this.getContentPane.add(panel); // add it to JApplet / JFrame
This is to add the listener where MouseHandler will be your custom handler class.
class MouseHandler extends java.awt.event.MouseAdapter{
#Override public void mouseEntered(MouseEvent e){
// your logic here
}
#Override public void mouseExited(MouseEvent e){
//
}
}
Now, how the MouseHandler class will get access to the JPanel, well that is up to you. Usually, I make the handler class a sub-class so it has access to all the methods, fields of the enclosing class. Alternatively, you can make getter and setter methods. It is up to you.
More here: http://docs.oracle.com/javase/tutorial/uiswing/events/mouselistener.html
Use MouseListener with events mouseEntered and mouseExited.
I have class main extends jframe, it has a button that calls /shows another class that extends jdialog.
If the button from jdialog is triggered, it will dispose that dialog and will remove all component of jframe, then add it to a new jpanel.
What should I do?
Here's my new broken code:
public class mainz extends JFrame{
mainz(){
setVisible(true);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
JToolBar r = new JToolBar();
r.add(Box.createHorizontalGlue());
add(r, BorderLayout.NORTH);
JButton n = new JButton();
r.add(n, BorderLayout.EAST);
n.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae){
show();
}
});
}
public void show(){
dialogz d = new dialogz(this);
d.setVisible(true);
}
public void lastHope(){
getContentPane().removeAll();
getContentPane().validate();
getContentPane().repaint();
}
public static void main (String[]args){
new mainz().setExtendedState(MAXIMIZED_BOTH);
}
}
public class dialogz extends JDialog{
public dialogz(final mainz owner) {
setSize(300, 300);
JButton n = new JButton("execute");
add(n);
final JFrame ew = (JFrame)super.getOwner();// <<
n.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae){
dispose();
//owner.lastHope;
ew.removeAll();// <<
ew.validate();// <<
ew.repaint();// <<
}
});
}
void yes(){
getOwner().removeAll();
getOwner().validate();
getOwner().repaint();
}
}
I know I can prevent my main class from extending jframe, and call it from main instead, but I want to do it like that...
Please help me ... T-T
Sorry for my English, I from a far away country ~,~"
update:
the error is
java.lang.ClassCastException: javax.swing.SwingUtilities$SharedOwnerFrame cannot be cast to javax.swing.JFrame
it will be done with delete the line that contain
// <<
then call lastHope();
but i think there's a another way to get that existing jframe to removeall
(by casting it first or something ~,~" )
You are calling getParent() but you never set the parent (or owner). That should happen in the constructor as already pointed out. Also, be mindful that getParent() returns a Container object and getOwner() returns a Window object. Both of these refer to the JFrame which is the parent and owner. If you want to use it as a JFrame, you'll have to cast the output as (JFrame). But removeAll() is in Container class so if that's all you want, there'll be no need for casting.
Update:
JFrame frame = new JFrame();
JDialog dialog = new JDialog(frame);//frame is owner
JFrame parentOfDialog = (JFrame)(dialog.getParent());
//OR
//JFrame parentOfDialog = (JFrame)(dialog.getOwner());
parentOfDialog.removeAll();
If you are using your custom class, pass JFrame in the constructor and call super.
Please read the javadoc on JDialog before you try to use it. Also, read more about inheritance.
I'm not clear on what your goal is, but if you want to change the components that are displayed in a container, such as a JFrame or JDialog's contentPane, then I recommend that you use a CardLayout to do this since it allows you to easily swap "views".
There could be two ways to do this:
Your JDialog class could use a reference to the JFrame that is passed in via its constructor (and you should then pass it immediately into the dialog's super constructor so that your modality will work correctly). You could then call any public methods in the JFrame's class.
Or since the JDialog is modal, the JFrame's code will halt while the dialog is visible. You could swap "views" immediately after the dialog has been disposed of and is no longer visible. this would keep the JFrame manipulating code in the JFrame class.
Edit: note that if you don't use CardLayout, then you're responsible for calling revalidate() and repaint() on any container who gets its components changed.
As an aside: since English is not your first tongue and nor is it the native language of many folks on this forum, please avoid using non-standard abbreviations. The clearer your communication with us, the easier it will be for us to understand you and help you.
I'm trying to close a frame yet open a new frame.
My application has page A, a JPanel with some controls and a specific button, and when the user clicks the button, I want page A to disappear and page B to appear (page B has controls that depend on the choices that are made by the user on page A).
This has been asked before, but there was no satisfactory answer. Inside the ActionListener implementation, namely public void ActionPerformed(ActionEvent e) from my jpanelForPageA class, I can comfortably write this.setVisible(false), but how can I set page B to a visible state?
You can do the removal of panel a and then the addition of panel b trick. Another is to use a CardLayout.
When you create your panels, you add them to a containing JPanel that you initialize with a CardLayout:
JPanel container = new JPanel(new CardLayout());
containter.add(getPanelA(), "PANEL_A");
containter.add(getPanelB(), "PANEL_B");
Then, in your actionPerformed, when you want to show panelB, you do this:
CardLayout cl = (CardLayout) container.getLayout();
cl.show("PANEL_B");
Take a look at this tutorial for some more ideas.
For some reason, I can never to get setVisible() to work for me to do what you're describing. Instead, I do this:
frame.remove(panelA);
frame.add(panelB);
"frame" is just the JFrame you want to put the panels in. Try this if the setVisible() method doesn't work :)
To your original question, all you have to do is (like aioobe said):
panelB.setVisible(true);
((btw, posting some of your code would help me figure out what you're trying to ask))
And this is just a guess as to what you're trying to do -- I'm guessing your JPanels are in different classes. Then, you'll need to do this:
class pages extends JFrame implements ActionListener
{
public pages()
{
panelA a = new panelA(this)
}
changeToA(panelB b)
{
remove(panelB);
add(new panelA(this));
}
changeToB(panelA a)
{
remove(panelA);
add(new panelB(this));
}
}
class panelA extends JPanel implements ActionListener
{
pages p;
public panelA(pages p)
{
this.p = p
}
// all that actionlistener code stuff
p.changeToB(this);
}
class panelB extends JPanel implements ActionListener
{
pages p;
public panelB(pages p)
{
this.p = p
}
// all that actionlistener code stuff
p.changeToA(this);
}
You pass the pages class to the panels so the panels can tell the pages class to remove themselves.
((I don't know if there is an easier way, but this is what I do all the time))
I hope I helped :)
You have to remove Panel A from the frame, add Panel B to the frame, and call invalidate on the frame (or containing panel). At least in Swing, I'm not sure about AWT, there you might need repaint or revalidate instead of invalidate.
You could also just create a whole new JFrame and dispose the one containing panel A.