change_watcher: add signals for tabs opened

This can be useful for plugins later though there is no experimental
plugin yet

lierre/change_watcher.py

@@ -3,6 +3,7 @@
 import heapq
 import itertools
 
+from PyQt5.QtWidgets import QWidget
 from PyQt5.QtCore import (
     QObject, pyqtSignal as Signal
 )
@@ -33,6 +34,9 @@ class ChangeWatcher(QObject):
     tagMailRemoved = Signal(str, str)
     mailAdded = Signal(str)
 
+    uiComposerOpened = Signal(QWidget)
+    uiThreadOpened = Signal(QWidget)
+    uiThreadsOpened = Signal(QWidget)
 
-WATCHER = ChangeWatcher()
 
+WATCHER = ChangeWatcher()

lierre/ui/tabwidget.py

@@ -5,6 +5,7 @@
 )
 from PyQt5.QtCore import pyqtSlot as Slot, pyqtSignal as Signal
 from PyQt5.QtGui import QKeySequence
+from lierre.change_watcher import WATCHER
 
 from .threads_widget import ThreadsWidget
 from .thread_widget import ThreadWidget
@@ -39,6 +40,7 @@ def addThreads(self):
         w.threadActivated.connect(self.addThread)
         w.tagActivated.connect(self._addThreadsTag)
         self._addTab(w, focus=True)
+        WATCHER.uiThreadsOpened.emit(w)
         return w
 
     @Slot(str)
@@ -52,6 +54,7 @@ def addThread(self, tid):
         w.triggeredReply.connect(self.addReply)
         w.triggeredResumeDraft.connect(self.addResumeDraft)
         self._addTab(w, focus=True)
+        WATCHER.uiThreadOpened.emit(w)
         return w
 
     @Slot(str, bool)
@@ -60,6 +63,7 @@ def addReply(self, mid, to_all):
         w.sent.connect(self._closeCompose)
         w.setReply(mid, to_all)
         self._addTab(w, focus=True)
+        WATCHER.uiComposerOpened.emit(w)
         return w
 
     @Slot(str)
@@ -68,13 +72,15 @@ def addResumeDraft(self, mid):
         w.sent.connect(self._closeCompose)
         w.setFromDraft(mid)
         self._addTab(w, focus=True)
+        WATCHER.uiComposerOpened.emit(w)
         return w
 
     @Slot()
     def addCompose(self):
         w = ComposeWidget(parent=self)
         w.sent.connect(self._closeCompose)
         self._addTab(w, focus=True)
+        WATCHER.uiComposerOpened.emit(w)
         return w
 
     @Slot()