CookJython Tutorial
To add
<jython> to your existing tag library, say CookSwing, add the following code:
CookJython.setupTagLibrary (CookSwing.getSwingTagLibrary ());
There are three attributes associated with the tag.
| Attribute | Description |
|---|
| return | Since Python does not have a way of returning a value outside functions, what you can do is to assign the return value to a variable in Python, then specify the variable in XML using this attribute. |
| class | In most cases, the return value's Java class type can be automatically generated. If not, then you can explicitly specify the Java class object to be generated from the Python code. |
| src | Jython code can be inserted in two ways: inside the tag, or in another resource/file specified using "src" attribute. |
Note that Python interpreter is sensitive to indentations, so make sure you do it correctly in XML.
<button text="Button 1">
<jython return="action" func="addActionListener">
from java.awt.event import ActionListener
class ExitAction (ActionListener):
def actionPerformed(self, e):
statusBar.setText (e.getSource ().getText () + " Pressed");
action = ExitAction ()
</jython>
</button>
<button text="Button 2">
<!-- calling an external Jython code (identical to the Jython code above) -->
<jython func="addActionListener" src="examples/cookjython/action.py" return="action"/>
</button>
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