Re: JTabbedPane fails to clip tab text

On Wednesday, March 6, 2013 7:06:39 AM UTC-8, John B. Matthews wrote:


 <fred.l.kleinschmidt@gmail.com> wrote: > I have a JTabbedPane with multipl=
e tabs, using WRAP_TAB_LAYOUT. > When the user shrinks the window, the long=
est tab label draws its > text outside the tab area instead of clipping it.=
 It even runs > over into the next tab. > > Also, when using Numbus LAF, it=
 does not size properly. > What am I missing to get this to work properly? =
The converse of Knute's key insight is that pack() will cause the JTabbedPa=
ne to adopt the preferred size of the _largest_ tab component. In the varia=
tion below, each component panel has a random initial width. Change the L&F=
 and/or resize the frame to see the effect. If you can test on Mac OS X, no=
te that AquaLookAndFeel clips the long label at small sizes. import java.aw=
t.BorderLayout; import java.awt.Component; import java.awt.Dimension; impor=
t java.awt.EventQueue; import java.awt.FlowLayout; import java.awt.GridLayo=
ut; import java.awt.event.ActionEvent; import java.awt.event.ActionListener=
; import java.awt.event.ComponentAdapter; import java.awt.event.ComponentEv=
ent; import java.util.ArrayList; import java.util.List; import java.util.Ra=
ndom; import javax.swing.JComboBox; import javax.swing.JFrame; import javax=
..swing.JLabel; import javax.swing.JPanel; import javax.swing.JTabbedPane; i=
mport javax.swing.JToolBar; import javax.swing.SwingUtilities; import javax=
..swing.UIManager; import javax.swing.UIManager.LookAndFeelInfo; public clas=
s TabTester extends JPanel { private static final Random r = new Random()=
; public TabTester() { setLayout(new BorderLayout()); JTabbedPane pane = =
new JTabbedPane( JTabbedPane.TOP, JTabbedPane.WRAP_TAB_LAYOUT); pane.addTab=
( "this is tab number 1, long label", createPane("p1")); pane.addTab("tab n=
umber 2", createPane("p2")); pane.addTab("this is tab 3", createPane("p3"))=
; pane.addTab("tab 4", createPane("p4")); pane.addTab("another tab", create=
Pane("p5")); add(pane, BorderLayout.CENTER); } private JPanel createPane(fi=
nal String name) { final Dimension d = new Dimension(300 + r.nextInt(42),=
 200); final JPanel p = new JPanel(new GridLayout()) { @Override public D=
imension getPreferredSize() { return d; } }; final JLabel label = new JLa=
bel(name, JLabel.CENTER); p.add(label); p.addComponentListener(new Componen=
tAdapter() { @Override public void componentResized(ComponentEvent e) { lab=
el.setText(name + ": width: " + p.getWidth()); } }); return p; } // http://=
stackoverflow.com/a/11949899/230513 private static JToolBar createToolBar(f=
inal Component parent) { final UIManager.LookAndFeelInfo[] available = UI=
Manager.getInstalledLookAndFeels(); List<String> names = new ArrayList<St=
ring>(); for (LookAndFeelInfo info : available) { names.add(info.getName())=
; } final JComboBox combo = new JComboBox(names.toArray()); String curren=
t = UIManager.getLookAndFeel().getName(); combo.setSelectedItem(current);=
 combo.addActionListener(new ActionListener() { @Override public void actio=
nPerformed(ActionEvent ae) { int index = combo.getSelectedIndex(); try { =
UIManager.setLookAndFeel( available[index].getClassName()); SwingUtilities.=
updateComponentTreeUI(parent); } catch (Exception e) { e.printStackTrace(Sy=
stem.err); } } }); JToolBar bar = new JToolBar("L&F"); bar.setLayout(new =
FlowLayout(FlowLayout.LEFT)); bar.add(combo); return bar; } public static v=
oid main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override=
 public void run() { JFrame frame = new JFrame("Tester"); frame.setDefaul=
tCloseOperation(JFrame.EXIT_ON_CLOSE); TabTester t = new TabTester(); t.a=
dd(createToolBar(frame), BorderLayout.NORTH); frame.add(t); frame.pack(); f=
rame.setVisible(true); } }); } } -- John B. Matthews trashgod at gmail dot =
com <http://sites.google.com/site/drjohnbmatthe

I still think that the text in a tab should NOT be drawn outside
the boundaries of the tab. If the text is too long to fit,
it should be clipped. That is what happens in the Motif XmNotebook widsget.

When using John's code, I notice that the Windows and Windows Classic LAF
almost does this (it draws the text one pixel past the tab edge and clips
the rest), while in all other LAF's the text bleeds over the tab bounds
up to the container's insets.

Nimbus is the worst - when the container shrinks so that is is narrower
than the longest tab, all tabs suddenly revert to a single row, and the
first tab and part of the second are visible with the text of the
first (long) tab bleeding over into the second tab.

--
Fred K