Don't create a statusbar in Qt, wx backends.

anntzer · anntzer · commit 88000b178947 · 2020-04-11T10:23:29.000+02:00
Display the coordinates text on the right of the toolbar, consistently
with the GTK3, wx, and (I think?) macosx backends.  This helps when
embedding Matplotlib in larger GUIs, because Matplotlib may not
necessarily control the statusbar (which is typically global for the
whole window) but controls the toolbar if there's one.

If we decide to go this route we could probably also kill the status bar
for toolmanager.
diff --git a/doc/api/api_changes_3.3/behaviour.rst b/doc/api/api_changes_3.3/behaviour.rst
@@ -163,3 +163,9 @@ The default method used to format `.Slider` values has been changed to use a
 values are displayed with an appropriate number of significant digits even if
 they are much smaller or much bigger than 1.  To restore the old behavior,
 explicitly pass a "%1.2f" as the *valfmt* parameter to `.Slider`.
+
+Qt and wx backends no longer create a status bar by default
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The coordinates information is now displayed in the toolbar, consistently with
+the other backends.  This is intended to simplify embedding of Matplotlib in
+larger GUIs, where Matplotlib may control the toolbar but not the status bar.
diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
@@ -555,23 +555,21 @@ def __init__(self, canvas, num):
             if self.toolbar:
                 backend_tools.add_tools_to_container(self.toolbar)
                 self.statusbar = StatusbarQt(self.window, self.toolmanager)
+                sbs_height = self.statusbar.sizeHint().height()
+        else:
+            sbs_height = 0
 
         if self.toolbar is not None:
             self.window.addToolBar(self.toolbar)
-            if not self.toolmanager:
-                # add text label to status bar
-                statusbar_label = QtWidgets.QLabel()
-                self.window.statusBar().addWidget(statusbar_label)
-                self.toolbar.message.connect(statusbar_label.setText)
             tbs_height = self.toolbar.sizeHint().height()
         else:
             tbs_height = 0
 
         # resize the main window so it will display the canvas with the
         # requested size:
         cs = canvas.sizeHint()
-        sbs = self.window.statusBar().sizeHint()
-        height = cs.height() + tbs_height + sbs.height()
+        cs_height = cs.height()
+        height = cs_height + tbs_height + sbs_height
         self.window.resize(cs.width(), height)
 
         self.window.setCentralWidget(self.canvas)
@@ -604,7 +602,7 @@ def _get_toolbar(self, canvas, parent):
         # must be inited after the window, drawingArea and figure
         # attrs are set
         if matplotlib.rcParams['toolbar'] == 'toolbar2':
-            toolbar = NavigationToolbar2QT(canvas, parent, False)
+            toolbar = NavigationToolbar2QT(canvas, parent, True)
         elif matplotlib.rcParams['toolbar'] == 'toolmanager':
             toolbar = ToolbarQt(self.toolmanager, self.window)
         else:
diff --git a/lib/matplotlib/backends/backend_wx.py b/lib/matplotlib/backends/backend_wx.py
@@ -936,9 +936,8 @@ def __init__(self, num, fig):
         # of the frame - so appearance is closer to GTK version
 
         self.toolmanager = self._get_toolmanager()
-        statusbar = (StatusbarWx(self, self.toolmanager)
-                     if self.toolmanager else StatusBarWx(self))
-        self.SetStatusBar(statusbar)
+        if self.toolmanager:
+            self.SetStatusBar(StatusbarWx(self, self.toolmanager))
         self.toolbar = self._get_toolbar()
 
         if self.toolmanager:
@@ -1151,6 +1150,10 @@ def _init_toolbar(self):
             self.Bind(wx.EVT_TOOL, getattr(self, callback),
                       id=self.wx_ids[text])
 
+        self.AddStretchableSpace()
+        self._label_text = wx.StaticText(self)
+        self.AddControl(self._label_text)
+
         self.Realize()
 
     def zoom(self, *args):
@@ -1307,9 +1310,7 @@ def statbar(self):
         return self.GetTopLevelParent().GetStatusBar()
 
     def set_message(self, s):
-        status_bar = self.GetTopLevelParent().GetStatusBar()
-        if status_bar is not None:
-            status_bar.set_function(s)
+        self._label_text.SetLabel(s)
 
     def set_history_buttons(self):
         can_backward = self._nav_stack._pos > 0
