Java Reference
In-Depth Information
wide lines. See
java.awt.BasicStroke
to learn how to draw with wide
lines.
10-5.
One shortcoming of the
FontChooser
class is that when you call
setSe-
lectedFont()
, the
ItemChooser
components are not updated to match the
current font. Modify
FontChooser
so that it does update these selections.
You'll probably want to modify
ItemChooser
so that, in addition to its
set-
SelectedIndex()
method, it also has
setSelectedLabel()
and
setSelect-
edValue()
methods that specify the selected item by label or by value.
10-6. Modify the
ShowComponent
program to add a Show Proper ties... com-
mand to the menu. When the user selects this menu item, the program
should use the
PropertyTable
component (in a separate window) to dis-
play the list of properties defined by the currently displayed component.
To enable this, you need to keep track of the displayed components, and
you have to query the
JTabbedPane
to find which component is currently
displayed.
Once you can display the table of properties correctly, add a menu item to
the property display window. This item, when selected, should find the
selected row of the table (use
getSelectedRow()
), and then allow the user
to set that property. Use one of the static methods of
JOptionPane
to dis-
play a dialog that allows the user to enter a property value (as a string),
then parse that value and set the specified property.
10-7. Modify
ShowComponent
again so that it has a Containment Hierarchy...
menu item. When the user selects this item, the program should use a
ComponentTree
component (in a separate window) to display the contain-
ment hierarchy of the currently displayed component.
10-8.
A common feature of web browsers is a Go menu that lists the last 10 or
15 URLs that have been visited and provides a quick way to revisit those
sites. Add this feature to the
WebBrowser
class. Note that
WebBrowser
already tracks its browsing history. You need to add a Go menu to the
JMenuBar
that is read from the
GUIResourceBundle
. The contents of the Go
menu depends on the current browsing history. One technique is to
change the contents of the menu each time the browser visits a new page.
Alternately, you can use a
MenuListener
object to receive notification just
before the menu is popped up, and then, from the
menuSelected()
method of the listener, add the appropriate items to the menu.
10-9. The
GUIResourceBundle
class and the
ResourceParser
extension interface
provide a powerful mechanism for describing a GUI in a properties file.
Implement more
ResourceParser
classes to support other resource types.
In particular, write parsers for the
ImageIcon
and
KeyStroke
classes; sup-
port for these two types is required to fully support the
ActionParser
class.
10-10. Modify the
ShowComponent
class to use the
ThemeManager
class (with an
appropriate properties file) and the Themes menu it can create. Ideally,
you should make the Themes menu a submenu of the Look and Feel
menu the program already displays.
