Swing Sampler
Contents
Stored here for posterity's sake it was found on http://hcc.cc.gatech.edu/documents/230_Edwards_swing-sampler.py and the nature of the web being what it is who knows how long it would be there or if I could find it again. This is exactly as I found it. I have verified that it works with Jython 2.2 with Java JVM 1.5 & 1.6 and based on the code I suspect it would work with a 1.4.2 JVM
#
# This code shows a sampler of common Java Swing widget types. This is
# by no means all of the available widgets. For documentation and tutorials
# on the underlying Java classes, see http://java.sun.com/products/jfc/
#
#
# We'll be using swing a lot, so import it as "swing". Swing is built using
# an older Java GUI toolkit called awt, so we'll need it too. One of the
# examples here also uses the Java networking package (you're unlikely to
# need that for the project...)
#
import javax.swing as swing
import java.awt as awt
import java.net as net
import sys
#
# I've organized the sampler code into a single class, called SwingSampler.
# The __init__ function (called the "constructor") does all of the setup.
# Note that __init__, like all other functions in a class (called "methods")
# takes "self" as its first argument.
#
class SwingSampler:
def __init__(self):
#########################################################
#
# set up the overall frame (the window itself)
#
self.window = swing.JFrame("Swing Sampler!")
self.window.windowClosing = self.goodbye
self.window.contentPane.layout = awt.BorderLayout()
#########################################################
#
# under this will be a tabbed pane; each tab is named
# and contains a panel with other stuff in it.
#
tabbedPane = swing.JTabbedPane()
self.window.contentPane.add("Center", tabbedPane);
#########################################################
#
# The first tabbed panel will be named "Some Basic
# Widgets", and is referenced by variable 'firstTab'
#
firstTab = swing.JPanel()
firstTab.layout = awt.BorderLayout()
tabbedPane.addTab("Some Basic Widgets", firstTab)
#
# slap in some labels, a list, a text field, etc... Some
# of these are contained in their own panels for
# layout purposes.
#
tmpPanel = swing.JPanel()
tmpPanel.layout = awt.GridLayout(3, 1)
tmpPanel.border = swing.BorderFactory.createTitledBorder("Labels are simple")
tmpPanel.add(swing.JLabel("I am a label. I am quite boring."))
tmpPanel.add(swing.JLabel("<HTML><FONT COLOR='blue'>HTML <B>labels</B>
</FONT> are <I>somewhat</I><U>less boring</U>.</HTML>"))
tmpPanel.add(swing.JLabel("Labels can also be aligned", swing.JLabel.RIGHT))
firstTab.add(tmpPanel, "North")
#
# Notice that the variable "tmpPanel" gets reused here.
# This next line creates a new panel, but we reuse the
# "tmpPanel" name to refer to it. The panel that
# tmpPanel used to refer to still exists, but we no
# longer have a way to name it (but that's ok, since
# we don't need to refer to it any more).
#
tmpPanel = swing.JPanel()
tmpPanel.layout = awt.BorderLayout()
tmpPanel.border = swing.BorderFactory.createTitledBorder("Tasty tasty lists")
#
# Note that here we stash a reference to the list in
# "self.list". This puts it in the scope of the object,
# rather than this function. This is because we'll be
# referring to it later from outside this function, so
# it needs to be "bumped up a level."
#
self.listData = ( "January", "February", "March", "April", "May", "June", "July",
"August", "September", "October", "November", "December" )
self.list = swing.JList(self.listData)
tmpPanel.add("Center", swing.JScrollPane(self.list))
button = swing.JButton("What's Selected?")
button.actionPerformed = self.whatsSelectedCallback;
tmpPanel.add("East", button)
firstTab.add("Center", tmpPanel)
tmpPanel = swing.JPanel()
tmpPanel.layout = awt.BorderLayout()
#
# The text field also goes in self, since the callback
# that displays the contents will need to get at it.
#
# Also note that because the callback is a function inside
# the SwingSampler object, you refer to it through self.
# (The callback could potentially be outside the object,
# as a top-level function. In that case you wouldn't
# use the 'self' selector; any variables that it uses
# would have to be in the global scope.
#
self.field = swing.JTextField()
tmpPanel.add(self.field)
tmpPanel.add(swing.JButton("Click Me", actionPerformed=self.clickMeCallback), "East")
firstTab.add(tmpPanel, "South")
#########################################################
#
# The second tabbed panel is next... This shows
# how to build a basic web browser in about 20 lines.
#
secondTab = swing.JPanel()
secondTab.layout = awt.BorderLayout()
tabbedPane.addTab("HTML Fanciness", secondTab)
tmpPanel = swing.JPanel()
tmpPanel.add(swing.JLabel("Go to:"))
self.urlField = swing.JTextField(40, actionPerformed=self.goToCallback)
tmpPanel.add(self.urlField)
tmpPanel.add(swing.JButton("Go!", actionPerformed=self.goToCallback))
secondTab.add(tmpPanel, "North")
#self.htmlPane = swing.JEditorPane("http://www.cc.gatech.edu", editable=0,
hyperlinkUpdate=self.followHyperlink, preferredSize=(400, 400))
self.htmlPane = swing.JEditorPane("http://www.jython.org", editable=0,
hyperlinkUpdate=self.followHyperlink, preferredSize=(400, 400))
secondTab.add(swing.JScrollPane(self.htmlPane), "Center")
self.statusLine = swing.JLabel("")
#########################################################
#
# The third tabbed panel is next...
#
thirdTab = swing.JPanel()
tabbedPane.addTab("Other Widgets", thirdTab)
imageLabel = swing.JLabel(swing.ImageIcon(net.URL("http://www.gatech.edu/images/logo-gatech.gif")))
imageLabel.toolTipText = "Labels can have images! Every widget can have a tooltip!"
thirdTab.add(imageLabel)
tmpPanel = swing.JPanel()
tmpPanel.layout = awt.GridLayout(3, 2)
tmpPanel.border = swing.BorderFactory.createTitledBorder("Travel Checklist")
tmpPanel.add(swing.JCheckBox("Umbrella", actionPerformed=self.checkCallback))
tmpPanel.add(swing.JCheckBox("Rain coat", actionPerformed=self.checkCallback))
tmpPanel.add(swing.JCheckBox("Passport", actionPerformed=self.checkCallback))
tmpPanel.add(swing.JCheckBox("Airline tickets", actionPerformed=self.checkCallback))
tmpPanel.add(swing.JCheckBox("iPod", actionPerformed=self.checkCallback))
tmpPanel.add(swing.JCheckBox("Laptop", actionPerformed=self.checkCallback))
thirdTab.add(tmpPanel)
tmpPanel = swing.JPanel()
tmpPanel.layout = awt.GridLayout(4, 1)
tmpPanel.border = swing.BorderFactory.createTitledBorder("My Pets")
#
# A ButtonGroup is used to indicate which radio buttons
# go together.
#
buttonGroup = swing.ButtonGroup()
radioButton = swing.JRadioButton("Dog", actionPerformed=self.radioCallback)
buttonGroup.add(radioButton)
tmpPanel.add(radioButton)
radioButton = swing.JRadioButton("Cat", actionPerformed=self.radioCallback)
buttonGroup.add(radioButton)
tmpPanel.add(radioButton)
radioButton = swing.JRadioButton("Pig", actionPerformed=self.radioCallback)
buttonGroup.add(radioButton)
tmpPanel.add(radioButton)
radioButton = swing.JRadioButton("Capybara", actionPerformed=self.radioCallback)
buttonGroup.add(radioButton)
tmpPanel.add(radioButton)
thirdTab.add(tmpPanel)
self.window.pack()
self.window.show()
#
# This is the callback that's run when the window closes. Here
# we just exit. Note that either functions inside class
# declarations or global functions can be callbacks. When they're
# inside a class they talk 'self' as the first argument. Just
# about all Swing callbacks also take an event argument as well.
#
def goodbye(self, event):
print "Goodbye!"
sys.exit()
#
# Callback for the "Click Me!" button on the first tab. This
# creates a new window to display what was in the text field,
# and then clears the text field.
#
def clickMeCallback(self, event):
dialog = swing.JFrame("You clicked the button!")
dialog.contentPane.layout = awt.BorderLayout()
dialog.contentPane.add(swing.JLabel("Text was: " + self.field.text))
dialog.size=(400, 200)
dialog.show()
print "Text is ", self.field.text
self.field.text = ""
#
# Callback for the "What's Selected?" button. This pops up a
# window that shows the contents and index of the selected item.
#
def whatsSelectedCallback(self, event):
dialog = swing.JFrame("Here's what's selected")
dialog.contentPane.layout = awt.GridLayout(2, 1)
dialog.contentPane.add(swing.JLabel("Selected value = " + str(self.list.selectedValue),
swing.JLabel.CENTER))
dialog.contentPane.add(swing.JLabel("Selected index = " + str(self.list.selectedIndex),
swing.JLabel.CENTER))
dialog.size=(400, 200)
dialog.show()
print "Selected value =", self.list.selectedValue, ", selected index =", self.list.selectedIndex;
#
# Callback for the "Go To" button; updates the contents of the
# HTML pane.
#
def goToCallback(self, event):
self.htmlPane.setPage(self.urlField.text)
#
# This callback is invoked whenever a link is clicked or moused
# over. The event is a HyperlinkEvent, which means that it
# defines certain fields and operations, which we can use below.
#
def followHyperlink(self, event):
if event.eventType == swing.event.HyperlinkEvent.EventType.ACTIVATED:
self.statusLine = event.URL.toString()
self.htmlPane.setPage(event.URL)
elif event.eventType == swing.event.HyperlinkEvent.EventType.ENTERED:
self.statusLine = event.URL.toString()
elif event.eventType == swing.event.HyperlinkEvent.EventType.EXITED:
self.statusLine = ""
#
# This is a common technique when a bunch of widgets share a
# single callback. You can look at the "source" field on the
# event argument to see which widget generated the event.
#
def checkCallback(self, event):
if event.source.selected:
print event.source.text + " was CHECKED"
else:
print event.source.text + " was UNCHECKED"
#
# This is the callback for all the radio buttons.
#
def radioCallback(self, event):
print event.source.text + " was clicked ON"
#
# This is how you make the main entry point for your program in Python.
# The system variable __name__ will be set to the string __main__ if
# this file is passed directly on the command line to Jython.
#
# Here, we simply create a SwingSampler, and it does everything from
# there.
#
if __name__ == "__main__":
sampler = SwingSampler()