Developing Viewer Plugins
Creating a Plugin File
Your plugin must have the extension .py and be a normally import-able module with these 3 functions:
name() and author() take no parameters and simply return the name of the plugin, and the author respectively. action() takes 2 parameters: a constant to describe the action that has happened, and an object that is relevant. Here are the constants and objects that will be passed to action():
Information on the internal classes of TuiView can be found at the Developer's Documentation page.
Installing Plugin File
Viewer searched for plugins in 3 locations upon startup:
- a 'plugins' directory under where the 'tuiview' script is running
- Any directories listed in the TUIVIEW_PLUGINS_PATH environment variable. Multiple directories can be listed and separated by ':' on Unix or ';' on Windows.
- Under ~/.tuiview/plugins where ~ is the user's home directory, or c:\Documents and Settings\username\ .tuiview\plugins on Windows
Note that these directories are searched in the order listed. Plugins with the same name found later will override those found first.
Adding a Custom Action to Viewer
Here is an example of adding a custom action and a new menu to Viewer via a plugin:
... # event handler class - must be derived from QObject # so Qt's signal and slots system works class MyEventHandler(QObject): def __init__(self, viewer): QObject.__init__(self) self.viewer = viewer # this function gets called when action triggered def myEvent(self): QMessageBox.information(self.viewer, "Viewer", "My Plugin") def action(actioncode, viewer): # check for the code we are interested in if actioncode == pluginmanager.PLUGIN_ACTION_NEWVIEWER: # create a handler class handler = MyEventHandler(viewer) # create an action class myaction = QAction(viewer, triggered=handler.myEvent) myaction.setText("My plugin Action") # create a new menu and install the action mymenu = viewer.menuBar().addMenu("&My Menu") mymenu.addAction(myaction) # make sure the object isn't garbage collected app = QApplication.instance() app.savePluginHandler(handler)