Add Plugin button to Print Composer

Question

I wonder if it's possible to add an plugin button (QAction) to the print composer toolbar. I only know options to add the plugin-buttons to the plugin,vector or database menu or to own toolbars in the main window of QGIS.

Answer 1

I found a way to solve the problem. I am just not sure if self.iface.mainWindow() is the correct parent QObject for this action.

import qgis
from PyQt4.QtCore import *
from PyQt4.QtGui import *

self.activeComposer = self.iface.activeComposers()

for item in self.activeComposer:
    print item.composerWindow().windowTitle()
    if item.composerWindow().windowTitle()=='test123':
        print "ja"
        self.composerWindow = item.composerWindow()
        print self.composerWindow
        self.action = QAction(u"Druckstempel einfügen", self.iface.mainWindow())
        # is self.iface.mainWindow() the correct QObject * parent for this Action?
        self.action.setIcon(QIcon(":/icons/cursor.png"))
        self.action.setWhatsThis(u"Druckstempel einfügen")
        self.action.setStatusTip(u"Druckstempel einfügen")
        self.test_toolbar=self.composerWindow.addToolBar("Test")
        self.test_toolbar.addAction(self.action)

self.action.triggered.connect(self.run)