Re: How do you consistently repaint a JComponent?

From:

"phillip.s.powell@gmail.com" <phillip.s.powell@gmail.com>

Newsgroups:

comp.lang.java.help

Date:

26 Feb 2007 06:36:27 -0800

Message-ID:

<1172500586.974448.4790@a75g2000cwd.googlegroups.com>

On Feb 23, 5:39 pm, Knute Johnson <nos...@rabbitbrush.frazmtn.com>
wrote:

phillip.s.pow...@gmail.com wrote:

[code]
     /**
         * Handle {@link #urlLabelText} to change color if {@link
java.net.URL} displayed is not {@link #homeURL}
         */
        private void handleURLLabelText() {
            if (SimpleBrowser.this.getURL() != null &&
                    SimpleBrowser.this.getHomeURL() != null &&
                    !
SimpleBrowser.this.getURL().equals(SimpleBrowser.this.getHomeURL())) {
                SimpleBrowser.this.urlLabel.setForeground(Color.RED);
                if (!this.hasAddedURLLabelMouseAdapter) {
                    // THIS IS TO ENSURE ONLY ONE MouseAdapter
mouseAdapter IS ADDED TO JLabel SimpleBrowser.this.urlLabel
                    this.hasAddedURLLabelMouseAdapter = true;

SimpleBrowser.this.urlLabel.addMouseListener(mouseAdapter);
                }
                SimpleBrowser.this.urlLabel.setToolTipText("Click onto
\"" + urlLabelText +
                        "\" to set \"" + getURLPath() + "\" as your
default homepage");
            } else if (this.hasAddedURLLabelMouseAdapter) {
                // THIS IS TO ENSURE THE RE-ADDING OF MouseAdapter
mouseAdapter
                this.hasAddedURLLabelMouseAdapter = false;

SimpleBrowser.this.urlLabel.removeMouseListener(mouseAdapter);
                SimpleBrowser.this.urlLabel.setToolTipText(null);

SimpleBrowser.this.urlLabel.setForeground(Color.BLACK);
            }

SimpleBrowser.this.urlLabel.setFont(SimpleBrowserGlobals.FONT);
            SimpleBrowser.this.urlLabel.repaint();
        }
[/code]

I want to always be able to repaint the JLable
SimpleBrowser.this.urlLabel, however, on occasions while its
ToolTipText is always set with a value (or null), and while I can add
or remove its MouseListener, I can't seem to always change the color
back from red to black (though I can always change it from default
black to red).

I thought using repaint() would ensure that the changes to the JLabel
would take place, but unfortunately it does not, not even when I
invoke:

[code]
     /**
         * Handle {@link #urlLabelText} to change color if {@link
java.net.URL} displayed is not {@link #homeURL}
         */
        private void handleURLLabelText() {
            if (SimpleBrowser.this.getURL() != null &&
                    SimpleBrowser.this.getHomeURL() != null &&
                    !
SimpleBrowser.this.getURL().equals(SimpleBrowser.this.getHomeURL())) {
                SimpleBrowser.this.urlLabel.setForeground(Color.RED);
                if (!this.hasAddedURLLabelMouseAdapter) {
                    // THIS IS TO ENSURE ONLY ONE MouseAdapter
mouseAdapter IS ADDED TO JLabel SimpleBrowser.this.urlLabel
                    this.hasAddedURLLabelMouseAdapter = true;

SimpleBrowser.this.urlLabel.addMouseListener(mouseAdapter);
                }
                SimpleBrowser.this.urlLabel.setToolTipText("Click onto
\"" + urlLabelText +
                        "\" to set \"" + getURLPath() + "\" as your
default homepage");
            } else if (this.hasAddedURLLabelMouseAdapter) {
                // THIS IS TO ENSURE THE RE-ADDING OF MouseAdapter
mouseAdapter
                this.hasAddedURLLabelMouseAdapter = false;

SimpleBrowser.this.urlLabel.removeMouseListener(mouseAdapter);
                SimpleBrowser.this.urlLabel.setToolTipText(null);

SimpleBrowser.this.urlLabel.setForeground(Color.BLACK);
            }

SimpleBrowser.this.urlLabel.setFont(SimpleBrowserGlobals.FONT);
            SimpleBrowser.this.urlLabel.repaint();
            SimpleBrowser.this.topPanel.validate(); // CONTAINS
urlLabel
            validate(); // SimpleBrowser ULTIMATELY EXTENDS JFrame
        }
[/code]

Suggestions?
Thanx
Phil

Are all the Swing component method calls being made on the EDT?

I am not sure what you mean by "EDT", sorry.

You

probably don't need the validate() or repaint() calls. Your problem is
most likely somewhere else other than the code you are showing.

--

Knute Johnson
email s/nospam/knute/