Drop all PyQt4 code

Fix #1203

README.rst

@@ -40,15 +40,3 @@ Or start the app with --debug flag.
 Due to the fact PyQT intercept you can use a web debugger for inspecting stuff:
 https://github.com/Kozea/wdb
 
-
-Test with PyQT4
-~~~~~~~~~~~~~~~~
-
-If you want to simulate a user with PyQT4:
-
-.. code:: bash
-   
-    export GNS3_QT4=1
-    python gns3/main.py
-
-

gns3/graphics_view.py

@@ -539,8 +539,7 @@ class GraphicsView(QtWidgets.QGraphicsView):
         """
 
         if event.modifiers() == QtCore.Qt.ControlModifier:
-            # event.delta() added for Qt4 compatibility
-            delta = event.angleDelta() if hasattr(event, 'angleDelta') else event.delta()
+            delta = event.angleDelta()
             if delta is not None and delta.x() == 0:
                 # CTRL is pressed then use the mouse wheel to zoom in or out.
                 self.scaleView(pow(2.0, delta.y() / 240.0))

gns3/main.py

@@ -195,10 +195,6 @@ def main():
                 result.append(int(i))
         return result
 
-    # 4.8.3 because of QSettings (http://pyqt.sourceforge.net/Docs/PyQt4/pyqt_qsettings.html)
-    if DEFAULT_BINDING == "PyQt4" and version(QtCore.BINDING_VERSION_STR) < version("4.8.3"):
-        raise SystemExit("Requirement is PyQt version 4.8.3 or higher, got version {}".format(QtCore.BINDING_VERSION_STR))
-
     if DEFAULT_BINDING == "PyQt5" and version(QtCore.BINDING_VERSION_STR) < version("5.0.0"):
         raise SystemExit("Requirement is PyQt5 version 5.0.0 or higher, got version {}".format(QtCore.BINDING_VERSION_STR))
 

gns3/qt/__init__.py

@@ -16,9 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 """
-Compatibility layer for Qt bindings, so it is easier to switch from PyQt4 to PyQt5 and
-vice-versa. It is possible to add PySide if needed.
-For PyQt4 and PyQt5 differences please see http://pyqt.sourceforge.net/Docs/PyQt5/pyqt4_differences.html
+Compatibility layer for Qt bindings, so it is easier to switch to PySide if needed.
 """
 
 # based on https://gist.github.com/remram44/5985681 and
@@ -36,23 +34,7 @@ import logging
 log = logging.getLogger(__name__)
 
 
-if os.environ.get('GNS3_QT4', None) is not None:
-    DEFAULT_BINDING = 'PyQt4'
-else:
-    try:
-        import PyQt5
-        DEFAULT_BINDING = 'PyQt5'
-    except ImportError:
-        DEFAULT_BINDING = 'PyQt4'
-
-
-if DEFAULT_BINDING == 'PyQt4':
-    log.critical('ERROR: PyQt4 is no longer supported, please upgrade to PyQt5 for Python 3')
-    from PyQt4 import QtGui
-    app = QtGui.QApplication(sys.argv)
-    message = QtGui.QMessageBox.critical(None, 'GNS3', 'PyQt4 is no longer supported, please upgrade to PyQt5 for Python 3')
-    sys.exit(1)
-
+DEFAULT_BINDING = 'PyQt5'
 
 from PyQt5 import QtCore, QtGui, QtNetwork, QtWidgets, Qt
 sys.modules[__name__ + '.QtCore'] = QtCore