I'm trying to change the colour of a hyperlink when hovering. Currently, when hovering it changes from green to dark blue, and I don't want it to change colour when hovering.
I think it's due to the predefined cursor.
public JHyperlink(String text, String url, String tooltip) {
...
setForeground(Color.green.darker()); //color before hovering
setToolTipText(tooltip);
setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
addMouseListener(new MouseAdapter() {
#Override
public void mouseEntered(MouseEvent e) {
setText(String.format(html, text));
}
#Override
public void mouseExited(MouseEvent e) {
setText(text);
}
Kind of a noob question, but then again, I am a noob. I'm trying to implement a sort of "universal" mouse listener. That is, when I click any of the objects on screen, it runs a specific amount of code. I have the current solution below, but the code I want to run is the same for 10 different objects, so this gets rather tedious.
difference2 = new JLabel(new ImageIcon("transparent.png"));
difference2.setBounds(645,490,10,10); //left, top, width, height
contentPane.add(difference2);
difference2.setVisible(true);
difference2.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e) {
//code
}
});
I am aware I can create a separate method such as the following
public void mouseClicked(MouseEvent e) {
JOptionPane.showMessageDialog(null,"this would be nice");
}
But I can't figure out how to set up a mouse listener on every object for it. The JOptionPane currently does nothing.
I might have misread your question, but if you want the same mouselistener on various objects,you could store the instance of your listener in a variable once and then add it to whatever gui object you want it added to.
MouseListener ml = new MouseListener() {
#Override
public void mouseReleased(MouseEvent e) {//code}
#Override
public void mousePressed(MouseEvent e) {//code}
#Override
public void mouseExited(MouseEvent e) {//code}
#Override
public void mouseEntered(MouseEvent e) {//code}
#Override
public void mouseClicked(MouseEvent e) {//code}
};
JLabel j1 = new JLabel("Label1");
j1.addMouseListener(ml);
JLabel j2 = new JLabel("Label2");
j2.addMouseListener(ml);
You can create an instance of an anonymous class that extends MouseAdapter and assign it to a variable that you can reuse (myMouseListener in this case):
MouseListener myMouseListener = new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
JOptionPane.showMessageDialog(null,"this would be nice");
}
};
difference2.addMouseListener(myMouseListener);
aSecondObject.addMouseListener(myMouseListener);
aThirdObject.addMouseListener(myMouseListener);
...
I have a JButton with an attached ActionListener. The action is performed when the button is clicked, but I want the action to be performed after the click (ie when the mouse button is released). How can I do this?
You cannot do this with an ActionListener. You will have to add a MouseListener and handle the mouseReleased event.
Example:
addMouseListener(new MouseListener() {
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
// TODO: add your code here
}
public void mouseClicked(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
});
Or even easier, with a MouseAdapter:
addMouseListener(new MouseAdapter() {
public void mouseReleased(MouseEvent e) {
// TODO: add your code here
}
});
I am trying to change the background of a JButton after it is clicked. Currently my buttons are located in a GridLayout (3x3) and look like this:
tiles.add(new JButton(new AbstractAction("") {
#Override
public void actionPerformed(ActionEvent e) {
this.setIcon("foo.png");
}
}));
This does not work. How do I manipulate the background of the image from within the actionperformed?
A JToggleButton might be ideal for this, as shown on Swing JToolbarButton pressing
Note that you would need to add some code to ensure a button was only clickable once.
Alternately you might use a standard JButton and call AbstractButton.setDisabledIcon(Icon). Disable the button when clicked, and it will flip to the alternate icon.
You can create your own listener that implements the MouseListener. This way, you can control when the background of the button changes (when the mouse is released, pressed, etc). Here is an example
//Add the listener to the button
myButton.addMouseListener(new customActionListener());
//Create the listener
class customActionListener implements MouseListener {
public void mouseExited(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
Icon icon = new ImageIcon("icon.gif");
myButton.setIcon(icon);
}
public void mouseClicked(MouseEvent e) {
}
}
At whatever point you want to set the background back to its default, use:
myButton.setIcon(new ImageIcon());
I needed a JButton with an attached dropdown style menu. So I took a JPopupMenu and attached it to the JButton in the way you can see in the code below. What it needs to do is this:
show the popup when clicked
hide it if clicked a second time
hide it if an item is selected in the popup
hide it if the user clicks somewhere else in the screen
These 4 things work, but because of the boolean flag I'm using, if the user clicks somewhere else or selects an item, I have to click twice on the button before it shows up again. That's why I tried to add a FocusListener (which is absolutely not responding) to fix that and set the flag false in these cases.
EDIT: Last attempt in an answer post...
Here are the listeners: (It's in a class extending JButton, so the second listener is on the JButton.)
// Show popup on left click.
menu.addFocusListener(new FocusListener() {
#Override
public void focusLost(FocusEvent e) {
System.out.println("LOST FOCUS");
isShowingPopup = false;
}
#Override
public void focusGained(FocusEvent e) {
System.out.println("GAINED FOCUS");
}
});
addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
System.out.println("isShowingPopup: " + isShowingPopup);
if (isShowingPopup) {
isShowingPopup = false;
} else {
Component c = (Component) e.getSource();
menu.show(c, -1, c.getHeight());
isShowingPopup = true;
}
}
});
I've been fighting with this for way too long now. If someone can give me a clue about what's wrong with this, it would be great!
Thanks!
Code:
public class Button extends JButton {
// Icon.
private static final ImageIcon ARROW_SOUTH = new ImageIcon("ArrowSouth.png");
// Unit popup menu.
private final JPopupMenu menu;
// Is the popup showing or not?
private boolean isShowingPopup = false;
public Button(int height) {
super(ARROW_SOUTH);
menu = new JPopupMenu(); // menu is populated somewhere else
// FocusListener on the JPopupMenu
menu.addFocusListener(new FocusListener() {
#Override
public void focusLost(FocusEvent e) {
System.out.println("LOST FOCUS");
isShowingPopup = false;
}
#Override
public void focusGained(FocusEvent e) {
System.out.println("GAINED FOCUS");
}
});
// ComponentListener on the JPopupMenu
menu.addComponentListener(new ComponentListener() {
#Override
public void componentShown(ComponentEvent e) {
System.out.println("SHOWN");
}
#Override
public void componentResized(ComponentEvent e) {
System.out.println("RESIZED");
}
#Override
public void componentMoved(ComponentEvent e) {
System.out.println("MOVED");
}
#Override
public void componentHidden(ComponentEvent e) {
System.out.println("HIDDEN");
}
});
// ActionListener on the JButton
addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
System.out.println("isShowingPopup: " + isShowingPopup);
if (isShowingPopup) {
menu.requestFocus();
isShowingPopup = false;
} else {
Component c = (Component) e.getSource();
menu.show(c, -1, c.getHeight());
isShowingPopup = true;
}
}
});
// Skip when navigating with TAB.
setFocusable(true); // Was false first and should be false in the end.
menu.setFocusable(true);
}
}
Here's a variant of Amber Shah's "big hack" suggestion I just made. Without the isShowingPopup flag...
It's not bulletproof, but it works quite well until someone comes in with an incredibly slow click to close the popup (or a very fast second click to reopen it...).
public class Button extends JButton {
// Icon.
private static final ImageIcon ARROW_SOUTH = new ImageIcon("ArrowSouth.png");
// Popup menu.
private final JPopupMenu menu;
// Last time the popup closed.
private long timeLastShown = 0;
public Button(int height) {
super(ARROW_SOUTH);
menu = new JPopupMenu(); // Populated somewhere else.
// Show and hide popup on left click.
menu.addPopupMenuListener(new PopupMenuListener() {
#Override
public void popupMenuWillBecomeInvisible(PopupMenuEvent arg0) {
timeLastShown = System.currentTimeMillis();
}
#Override public void popupMenuWillBecomeVisible(PopupMenuEvent arg0) {}
#Override public void popupMenuCanceled(PopupMenuEvent arg0) {}
});
addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if ((System.currentTimeMillis() - timeLastShown) > 300) {
Component c = (Component) e.getSource();
menu.show(c, -1, c.getHeight());
}
}
});
// Skip when navigating with TAB.
setFocusable(false);
}
}
As I said in comments, that's not the most elegant solution, but it's horribly simple and it works in 98% of the cases.
Open to suggestions!
Here is another approach which is not too bad of a hack, if not elegant, and which, as far as I could tell, works. First, at the very top, I added a second boolean called showPopup.
The FocusListener has to be as follows:
menu.addFocusListener(new FocusListener() {
#Override
public void focusLost(FocusEvent e) {
System.out.println("LOST FOCUS");
isShowingPopup = false;
}
#Override
public void focusGained(FocusEvent e) {
System.out.println("GAINED FOCUS");
isShowingPopup = true;
}
});
The isShowingPopup boolean does not get changed anywhere else--if it gains focus, it assumes it's shown and if it loses focus, it assumes it isn't.
Next, the ActionListener on the button is different:
addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
System.out.println("isShowingPopup: " + isShowingPopup);
if (showPopup) {
Component c = (Component) e.getSource();
menu.show(c, -1, c.getHeight());
menu.requestFocus();
} else {
showPopup = true;
}
}
});
Now comes the really new bit. It's a MouseListener on the button:
addMouseListener(new MouseAdapter() {
#Override
public void mousePressed(MouseEvent e) {
System.out.println("ispopup?: " + isShowingPopup);
if (isShowingPopup) {
showPopup = false;
}
}
#Override
public void mouseReleased(MouseEvent e) {
showPopup = true;
}
});
Basically, mousePressed gets called before the menu loses focus, so isShowingPopup reflects whether the popup was shown before the button is pressed. Then, if the menu was there, we just set showPopup to false, so that the actionPerformed method does not show the menu once it gets called (after the mouse is let go).
This behaved as expected in every case but one: if the menu was showing and the user pressed the mouse on the button but released it outside of it, actionPerformed was never called. This meant that showPopup remained false and the menu was not shown the next time the button was pressed. To fix this, the mouseReleased method resets showPopup. The mouseReleased method gets called after actionPerformed, as far as I can tell.
I played around with the resulting button for a bit, doing all the things I could think of to the button, and it worked as expected. However, I am not 100% sure that the events will always happen in the same order.
Ultimately, I think this is, at least, worth trying.
You could use the JPopupMenu.isVisible() instead of your Boolean variable to check the current state of the popup menu.
Have you tried adding a ComponentListener to the JPopupMenu, so that you know when it's been shown and hidden (and update your isShowingPopup flag accordingly)? I'm not sure listening for focus changes is necessarily the right approach.
What you need is a PopupMenuListener:
menu.addPopupMenuListener(new PopupMenuListener() {
#Override
public void popupMenuWillBecomeVisible(PopupMenuEvent arg0) {
}
#Override
public void popupMenuWillBecomeInvisible(PopupMenuEvent arg0) {
System.out.println("MENU INVIS");
isShowingPopup = false;
}
#Override
public void popupMenuCanceled(PopupMenuEvent arg0) {
System.out.println("MENU CANCELLED");
isShowingPopup = false;
}
});
I inserted this into your code and verified that it works.
Well, I can't be sure without seeing all of your code, but is it possible that the popup never actually gets focus at all? I've had problems with things' not getting focus properly in Swing before, so it could be the culprit. Try calling setFocusable(true) on the menu and then calling requestFocus() when you make the menu appear.
I tried the Answer of Tikhon Jelvis (introducing a smart combination of focusListener and mouseListener). It does not work for me on Linux (Java7/gtk). :-(
Reading http://docs.oracle.com/javase/7/docs/api/javax/swing/JComponent.html#requestFocus%28%29 there is written "Note that the use of this method is discouraged because its behavior is platform dependent."
It may be that the order of listener calls changed with Java7 or it changes with GTK vs Windows. I would not recommend this solution if you want to be platform independent.
BTW: I created a new account on stackoverflow to give this hint. It seems I am not allowed to comment to his answer (because of reputation). But it seems I have a button to edit it. This stackoverflow is a very funny thing. :-)