Button Example

This example shows how to use Buttons from Jython. Three buttons should be displayed in the applet below.
Something has gone wrong loading this applet.

The complete source code for this example is included below.


from java import awt, applet

class ButtonDemo(applet.Applet):
    def init(self):
        self.b1 = awt.Button('Disable middle button', actionPerformed=self.disable)
        self.b2 = awt.Button('Middle button')
        self.b3 = awt.Button('Enable middle button', enabled=0, actionPerformed=self.enable)

        self.add(self.b1)
        self.add(self.b2)
        self.add(self.b3)

    def enable(self, event):
        self.b1.enabled = self.b2.enabled = 1
        self.b3.enabled = 0

    def disable(self, event):
        self.b1.enabled = self.b2.enabled = 0
        self.b3.enabled = 1

The init method creates three buttons with the appropriate labels. It also specifies the actions to be performed when the first and third buttons are clicked. These actions are specified using event properties. Finally, this method adds these three buttons to the applet (which is using the default FlowLayout).

The enable and disable methods change the states of the buttons as appropriate. Notice that this is done using the enabled property of the Buttons.