<html>
  <head>
    <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    It's in QgisApp but not in QgisInterface.<br>
    <br>
    It is only used internally by the app (in the composermanager for
    exactly the same purpose as you are trying to use it for AFAICS).<br>
    Anyway, I don't see any reason not to make this available on the
    public interface as well...<br>
    <br>
    <div class="moz-cite-prefix">On 04/07/2015 11:51 PM, Junior Delaz
      wrote:<br>
    </div>
    <blockquote
cite="mid:CAECJsSpE=Fbz6OX_hBW4XS=07DsVXR-EPUaDVgyYavJTxR8-pw@mail.gmail.com"
      type="cite">
      <div dir="ltr">But why does composerRemoved not work? You can find
        it in the code on github repo but not on QGIS API website...<br>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">2015-04-07 23:35 GMT+02:00 Matthias
          Kuhn <span dir="ltr"><<a moz-do-not-send="true"
              href="mailto:matthias@opengis.ch" target="_blank">matthias@opengis.ch</a>></span>:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div bgcolor="#FFFFFF" text="#000000"> Oops,<br>
              <br>
              That should have been composerWillBeRemoved<br>
              <br>
              Sorry for that...<span class="HOEnZb"><font
                  color="#888888"><br>
                  <br>
                  Matthias</font></span>
              <div>
                <div class="h5"><br>
                  <br>
                  <div>On 04/07/2015 10:07 PM, Junior Delaz wrote:<br>
                  </div>
                  <blockquote type="cite">
                    <div dir="ltr">
                      <div><font>Thank you Matthias for your
                          perseverance. It's very helpful and
                          encouraging for beginners.<br>
                        </font></div>
                      <font>I have already tried composerRemoved but
                        when loading the plugin, QGIS complains :</font><br>
                      <span style="color:rgb(255,0,0)"><br>
                        Impossible de charger l'extension MapsPrinter
                        provoque une erreur lors de l'appel de sa
                        méthode initGui()</span><br>
                      <pre style="margin:12px 0px;text-indent:0px"><span style="font-family:"Courier New,courier"">Traceback (most recent call last):
  File "C:/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 228, in startPlugin
    plugins[packageName].initGui()
  File "C:/Users/harrissou/.qgis2/python/plugins\MapsPrinter\maps_printer.py", line 129, in initGui
    self.iface.composerRemoved.connect(self.refreshList)
AttributeError: 'QgisInterface' object has no attribute 'composerRemoved'

</span></pre>
                      <pre style="margin:12px 0px;text-indent:0px"><font size="4"><span style="font-family:"Courier New,courier"">This happens with all the versions of QGIS I use :
- osgeo4w 32bits (windows 8), </span></font><font size="4"><span style="font-family:"Courier New,courier""><font size="4"><span style="font-family:"Courier New,courier"">osgeo4w </span></font>64bits (windows 7): either with QGIS 2.8, 2.8rel-dev and 2.9
- and Mac OS 10.9 (it is a QGIS 2.4 but composerRemoved is supposed to have been added since QGIS 2.3 [0])

</span></font></pre>
                      <pre style="margin:12px 0px;text-indent:0px"><font size="4"><span style="font-family:"Courier New,courier"">About Qt.QueuedConnection, my first tests were on the Mac OS (x86-64) and Osgeo4w 64bits versions. But I never encountered crash with the 32 bits version, using the same code. Can the bug be bound to the architecture?
</span></font></pre>
                      <pre style="margin:12px 0px;text-indent:0px"><font size="4"><span style="font-family:"Courier New,courier"">[0] </span></font><a moz-do-not-send="true" href="https://github.com/qgis/QGIS/blob/master/src/app/qgisapp.h#L1260" target="_blank">https://github.com/qgis/QGIS/blob/master/src/app/qgisapp.h#L1260</a>
</pre>
                    </div>
                    <div class="gmail_extra"><br>
                      <div class="gmail_quote">2015-04-06 22:11
                        GMT+02:00 Matthias Kuhn <span dir="ltr"><<a
                            moz-do-not-send="true"
                            href="mailto:matthias@opengis.ch"
                            target="_blank">matthias@opengis.ch</a>></span>:<br>
                        <blockquote class="gmail_quote" style="margin:0
                          0 0 .8ex;border-left:1px #ccc
                          solid;padding-left:1ex">
                          <div bgcolor="#FFFFFF" text="#000000"> Hi
                            Junior,<br>
                            <br>
                            The following lines work for a short
                            test-case.<br>
                            <br>
                            def compAdded( composer ):<br>
                              print composer<br>
                            <br>
                            def compRemoved( composer ):<br>
                              print composer<br>
                            <br>
                            iface.composerAdded.connect( compAdded )<br>
                            iface.composerRemoved.connect( compRemoved )<br>
                            <br>
                            It is possible that the QueuedConnection
                            crashes because along with it a composer is
                            emitted which at the time the slot is
                            executed is already deleted. That was only a
                            possible approach which I did not test and
                            reading your report seems unstable.<span><font
                                color="#888888"><br>
                                <br>
                                Matthias</font></span>
                            <div>
                              <div><br>
                                <br>
                                <div>On 04/06/2015 12:33 AM, Junior
                                  Delaz wrote:<br>
                                </div>
                                <blockquote type="cite">
                                  <div dir="ltr">
                                    <div>
                                      <div>Hi,<br>
                                      </div>
                                      I do understand nothing.<br>
                                    </div>
                                    <div>After I read your message,
                                      Matthias, I told myself that using
                                      QT. QueuedConnection should be the
                                      easiest way. Then i wrote <br>
                                      self.iface.composerWillBeRemoved.connect(self.refreshList,


                                      Qt.QueuedConnection)<br>
                                      But each time i delete a composer,
                                      QGIS crashes.<br>
                                    </div>
                                    <div>So I've spent the week on
                                      reading about Qt.QueuedConnection
                                      and then signal and slots,
                                      function partial, QSignalMapper,
                                      sender trying to understand how I
                                      can catch the sender and manage to
                                      update my list. All this without
                                      success in the code.<br>
                                    </div>
                                    <div>And today, I tried again
                                      Qt.QueuedConnection, QGIS crashed.
                                      Without any changes, I tried again
                                      and it worked and continues to
                                      work. Adding and deleting composer
                                      in the composer manager echoes in
                                      my list.<br>
                                    </div>
                                    <div>I hope it will remain like
                                      that. <br>
                                    </div>
                                    <div><br>
                                    </div>
                                    <div>But now I realize that I didn't
                                      take into account the renaming of
                                      a composer. :(<br>
                                      <br>
                                    </div>
                                    <div>I think I'd wisely keep the
                                      refreshlist button unless someone
                                      tells me how I can reach the
                                      composer manager dialog
                                      programmatically. So that I will
                                      try to synchronize my list with
                                      its widgetlistitems...<br>
                                    </div>
                                    <div><br>
                                    </div>
                                    <div>Thanks for all...<br>
                                    </div>
                                    <div><br>
                                    </div>
                                  </div>
                                  <div class="gmail_extra"><br>
                                    <div class="gmail_quote">2015-03-31
                                      14:50 GMT+02:00 Matthias Kuhn <span
                                        dir="ltr"><<a
                                          moz-do-not-send="true"
                                          href="mailto:matthias@opengis.ch"
                                          target="_blank">matthias@opengis.ch</a>></span>:<br>
                                      <blockquote class="gmail_quote"
                                        style="margin:0 0 0
                                        .8ex;border-left:1px #ccc
                                        solid;padding-left:1ex">
                                        <div bgcolor="#FFFFFF"
                                          text="#000000"> You should get
                                          a parameter containing the
                                          composer that is being deleted
                                          with composerWillBeRemoved
                                          signal. Try to use that to
                                          infer which composer has been
                                          removed. As the signal name
                                          indicates, at the time it is
                                          emitted, the composer is not
                                          deleted yet.<br>
                                          As an alternative you may make
                                          the connection with
                                          Qt.QueuedConnection. It is
                                          possible that with this
                                          connection style you will
                                          receive the signal after
                                          deletion and are able to
                                          continue using your current
                                          update method.<br>
                                          <br>
                                          Best<span><font
                                              color="#888888"><br>
                                              Matthias</font></span>
                                          <div>
                                            <div><br>
                                              <br>
                                              <div>On 03/31/2015 02:04
                                                PM, Junior Delaz wrote:<br>
                                              </div>
                                              <blockquote type="cite">
                                                <div dir="ltr">
                                                  <div>
                                                    <div>
                                                      <div>
                                                        <div>
                                                          <div>
                                                          <div>Matthias,<br>
                                                          </div>
                                                          Thanks. I just
                                                          give it a try
                                                          it and all
                                                          goes well with
                                                          composerAdded.
                                                          <br>
                                                          </div>
                                                          But not really
                                                          well with
                                                          composerWillBeRemoved
                                                          signal. The
                                                          first deletion
                                                          in the
                                                          composer
                                                          manager does
                                                          nothing and
                                                          deleting a
                                                          second
                                                          composer does
                                                          remove the
                                                          first one in
                                                          my list. and
                                                          so on...<br>
                                                          My update
                                                          function
                                                          should be
                                                          rewritten I
                                                          think.  I'll
                                                          try to see how
                                                          improving it
                                                          and may
                                                          (surely) ask
                                                          again for help
                                                          (if needed).<br>
                                                        </div>
                                                        <br>
                                                      </div>
                                                    </div>
                                                    While seeking
                                                    information about
                                                    composerWillBeRemoved,
                                                    I found a
                                                    composerRemoved [1]
                                                    [2] signal (that
                                                    doesn't appear in
                                                    the API doc) and
                                                    without being able
                                                    to use it. :(<br>
                                                    [1] <a
                                                      moz-do-not-send="true"
href="https://github.com/qgis/QGIS/blob/master/src/app/composer/qgscomposermanager.cpp"
                                                      target="_blank">https://github.com/qgis/QGIS/blob/master/src/app/composer/qgscomposermanager.cpp</a>
                                                    (line 48<br>
                                                    [2] <a
                                                      moz-do-not-send="true"
href="https://github.com/qgis/QGIS/blob/master/src/app/qgisapp.cpp"
                                                      target="_blank">https://github.com/qgis/QGIS/blob/master/src/app/qgisapp.cpp</a>
                                                    (line 5601)<br>
                                                    <br>
                                                  </div>
                                                  Another thing that may
                                                  not be related : what
                                                  the
                                                  deletePrintComposers
                                                  function (<a
                                                    moz-do-not-send="true"
href="https://github.com/qgis/QGIS/blob/master/src/app/qgisapp.cpp"
                                                    target="_blank">https://github.com/qgis/QGIS/blob/master/src/app/qgisapp.cpp</a>
                                                  line 5698) is for?<br>
                                                  <br>
                                                  Thanks again for the
                                                  clue.</div>
                                                <div class="gmail_extra"><br>
                                                  <div
                                                    class="gmail_quote">2015-03-31

                                                    9:43 GMT+02:00
                                                    Matthias Kuhn <span
                                                      dir="ltr"><<a
                                                        moz-do-not-send="true"
href="mailto:matthias@opengis.ch" target="_blank">matthias@opengis.ch</a>></span>:<br>
                                                    <blockquote
                                                      class="gmail_quote"
                                                      style="margin:0 0
                                                      0
                                                      .8ex;border-left:1px
                                                      #ccc
                                                      solid;padding-left:1ex">
                                                      <div
                                                        bgcolor="#FFFFFF"
                                                        text="#000000">
                                                        QgisInterface
                                                        (iface) has a
                                                        composerAdded
                                                        and
                                                        composerWillBeRemoved
                                                        signal.<br>
                                                        <br>
                                                        Did you try to
                                                        connect to
                                                        these?<br>
                                                        <br>
                                                        Best,<br>
                                                        Matthias
                                                        <div>
                                                          <div><br>
                                                          <br>
                                                          <div>On
                                                          03/31/2015
                                                          09:34 AM,
                                                          Junior wrote:<br>
                                                          </div>
                                                          <blockquote
                                                          type="cite">
                                                          <div
                                                          style="font-family:'Calibri','sans-serif'">
                                                          <div>Hi all,
                                                          Luca</div>
                                                          <div>Thanks for

                                                          answering. But
                                                          i already have
                                                          an update
                                                          function that
                                                          I linked to an
                                                          update list
                                                          button. I even
                                                          linked it to
                                                          the icon on
                                                          the toolbar so
                                                          that when user
                                                          calls
                                                          foreground the
                                                          dialog it's
                                                          already
                                                          updated.</div>
                                                          <div>The case
                                                          I'd like to
                                                          manage: user
                                                          can open
                                                          plugin dialog
                                                          and composer
                                                          manager. The
                                                          two dialogs
                                                          are visible
                                                          (to the eyes)
                                                          even
                                                          though composer
                                                          manager is the
                                                          one at
                                                          foreground. He
                                                          makes changes
                                                          and directly
                                                          clicked on the
                                                          plugin dialog.
                                                          He should
                                                          update list
                                                          but if he
                                                          forgets and
                                                          executes, this
                                                          may lead to
                                                          bug I don't
                                                          want to /
                                                          can't yet
                                                          manage.</div>
                                                          <div>Reason
                                                          why I want to
                                                          ensure that
                                                          list is always
                                                          up to date
                                                          when he
                                                          interacts with
                                                          the dialog</div>
                                                          <div><br>
                                                          </div>
                                                          <div>Envoyé
                                                          depuis mon HTC</div>
                                                          <br>
                                                          <div>-----
                                                          Reply message
                                                          -----<br>
                                                          De : "Luca
                                                          Manganelli" <a
moz-do-not-send="true" href="mailto:luca76@gmail.com" target="_blank"><luca76@gmail.com></a><br>
                                                          Pour :<br>
                                                          Cc : <a
                                                          moz-do-not-send="true"
href="mailto:qgis-user@lists.osgeo.org" target="_blank">"qgis-user@lists.osgeo.org"</a>
                                                          <a
                                                          moz-do-not-send="true"
href="mailto:qgis-user@lists.osgeo.org" target="_blank"><qgis-user@lists.osgeo.org></a>,
                                                          "qgis-developer"
                                                          <a
                                                          moz-do-not-send="true"
href="mailto:qgis-developer@lists.osgeo.org" target="_blank"><qgis-developer@lists.osgeo.org></a><br>
                                                          Objet :
                                                          [Qgis-developer]
                                                          [Qgis-user]
                                                          Pyqt4 : which
                                                          signal is sent
                                                          when dialog
                                                          comes to
                                                          foreground?<br>
                                                          Date : mar.,
                                                          mars 31, 2015
                                                          07:56</div>
                                                          </div>
                                                          <br>
                                                          <pre style="word-wrap:break-word;white-space:pre-wrap">On Mon, Mar 30, 2015 at 6:12 PM, Junior Delaz <a moz-do-not-send="true" href="mailto:delazj@gmail.com" target="_blank"><delazj@gmail.com></a> wrote:
> I've read about defining a custom showEvent function but can't understand
> where to put it and what inside.
> If somebody can give some tips...

You could add a "Update list" button
_______________________________________________
Qgis-developer mailing list
<a moz-do-not-send="true" href="mailto:Qgis-developer@lists.osgeo.org" target="_blank">Qgis-developer@lists.osgeo.org</a>
<a moz-do-not-send="true" href="http://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">http://lists.osgeo.org/mailman/listinfo/qgis-developer</a>
</pre>
                                                          <br>
                                                          <fieldset></fieldset>
                                                          <br>
                                                          <pre>_______________________________________________
Qgis-developer mailing list
<a moz-do-not-send="true" href="mailto:Qgis-developer@lists.osgeo.org" target="_blank">Qgis-developer@lists.osgeo.org</a>
<a moz-do-not-send="true" href="http://lists.osgeo.org/mailman/listinfo/qgis-developer" target="_blank">http://lists.osgeo.org/mailman/listinfo/qgis-developer</a></pre>
                                                          </blockquote>
                                                          <br>
                                                          </div>
                                                        </div>
                                                      </div>
                                                      <br>
_______________________________________________<br>
                                                      Qgis-developer
                                                      mailing list<br>
                                                      <a
                                                        moz-do-not-send="true"
href="mailto:Qgis-developer@lists.osgeo.org" target="_blank">Qgis-developer@lists.osgeo.org</a><br>
                                                      <a
                                                        moz-do-not-send="true"
href="http://lists.osgeo.org/mailman/listinfo/qgis-developer"
                                                        target="_blank">http://lists.osgeo.org/mailman/listinfo/qgis-developer</a><br>
                                                    </blockquote>
                                                  </div>
                                                  <br>
                                                </div>
                                              </blockquote>
                                              <br>
                                            </div>
                                          </div>
                                        </div>
                                      </blockquote>
                                    </div>
                                    <br>
                                  </div>
                                </blockquote>
                                <br>
                              </div>
                            </div>
                          </div>
                        </blockquote>
                      </div>
                      <br>
                    </div>
                  </blockquote>
                  <br>
                </div>
              </div>
            </div>
          </blockquote>
        </div>
        <br>
      </div>
    </blockquote>
    <br>
  </body>
</html>