Supported & tested on wx, gtk, gtk3, qt3, tk.

matplotlib · pelson · Jul 9, 2012 · May 29, 2012 · May 30, 2012 · May 30, 2012
commit 41aa5052634ba305801d1f553b0348c6618942f6
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -2108,6 +2108,15 @@ def set_window_title(self, title):
         if hasattr(self, "manager"):
             self.manager.set_window_title(title)
 
+    def get_default_filename(self):
+        """
+        Return a string, which includes extension, suitable for use as
+        a default filename.
+        """
+        default_filename = self.get_window_title() or 'image'
+        default_filename = default_filename.lower().replace(' ', '_')
+        return default_filename + '.' + self.get_default_filetype()
+
     def switch_backends(self, FigureCanvasClass):
         """
         Instantiate an instance of FigureCanvasClass

diff --git a/lib/matplotlib/backends/backend_gtk.py b/lib/matplotlib/backends/backend_gtk.py
@@ -529,7 +529,7 @@ def __init__(self, canvas, num):
         FigureManagerBase.__init__(self, canvas, num)
 
         self.window = gtk.Window()
-        self.window.set_title("Figure %d" % num)
+        self.set_window_title("Figure %d" % num)
         if (window_icon):
             try:
                 self.window.set_icon_from_file(window_icon)
@@ -620,6 +620,9 @@ def _get_toolbar(self, canvas):
             toolbar = None
         return toolbar
 
+    def get_window_title(self):
+        return self.window.get_title()
+
     def set_window_title(self, title):
         self.window.set_title(title)
 
@@ -725,11 +728,13 @@ def _init_toolbar2_4(self):
         self.show_all()
 
     def get_filechooser(self):
-        return FileChooserDialog(
+        fc = FileChooserDialog(
             title='Save the figure',
             parent=self.win,
             filetypes=self.canvas.get_supported_filetypes(),
             default_filetype=self.canvas.get_default_filetype())
+        fc.set_current_name(self.canvas.get_default_filename())
+        return fc
 
     def save_figure(self, *args):
         fname, format = self.get_filechooser().get_filename_from_user()

diff --git a/lib/matplotlib/backends/backend_gtk3.py b/lib/matplotlib/backends/backend_gtk3.py
@@ -358,7 +358,7 @@ def __init__(self, canvas, num):
         FigureManagerBase.__init__(self, canvas, num)
 
         self.window = Gtk.Window()
-        self.window.set_title("Figure %d" % num)
+        self.set_window_title("Figure %d" % num)
         if (window_icon):
             try:
                 self.window.set_icon_from_file(window_icon)
@@ -447,6 +447,9 @@ def _get_toolbar(self, canvas):
             toolbar = None
         return toolbar
 
+    def get_window_title(self):
+        return self.window.get_title()
+
     def set_window_title(self, title):
         self.window.set_title(title)
 
@@ -532,11 +535,13 @@ def _init_toolbar(self):
         self.show_all()
 
     def get_filechooser(self):
-        return FileChooserDialog(
+        fc = FileChooserDialog(
             title='Save the figure',
             parent=self.win,
             filetypes=self.canvas.get_supported_filetypes(),
             default_filetype=self.canvas.get_default_filetype())
+        fc.set_current_name(self.canvas.get_default_filename())
+        return fc
 
     def save_figure(self, *args):
         fname, format = self.get_filechooser().get_filename_from_user()

diff --git a/lib/matplotlib/backends/backend_qt.py b/lib/matplotlib/backends/backend_qt.py
@@ -219,7 +219,7 @@ def __init__( self, canvas, num ):
         # Give the keyboard focus to the figure instead of the manager
         self.canvas.setFocusPolicy( qt.QWidget.ClickFocus )
         self.canvas.setFocus()
-        self.window.setCaption( "Figure %d" % num )
+        self.set_window_title( "Figure %d" % num )
 
         self.window._destroying = False
 
@@ -293,6 +293,9 @@ def destroy( self, *args ):
         if DEBUG: print("destroy figure manager")
         self.window.close(True)
 
+    def get_window_title(self):
+        return str(self.window.caption())
+
     def set_window_title(self, title):
         self.window.setCaption(title)
 
@@ -420,7 +423,7 @@ def save_figure(self, *args):
         sorted_filetypes.sort()
         default_filetype = self.canvas.get_default_filetype()
 
-        start = 'image.' + default_filetype
+        start = self.canvas.get_default_filename()
         filters = []
         selectedFilter = None
         for name, exts in sorted_filetypes:

diff --git a/lib/matplotlib/backends/backend_tkagg.py b/lib/matplotlib/backends/backend_tkagg.py
@@ -494,7 +494,7 @@ def __init__(self, canvas, num, window):
         FigureManagerBase.__init__(self, canvas, num)
         self.window = window
         self.window.withdraw()
-        self.window.wm_title("Figure %d" % num)
+        self.set_window_title("Figure %d" % num)
         self.canvas = canvas
         self._num =  num
         _, _, w, h = canvas.figure.bbox.bounds
@@ -565,6 +565,9 @@ def destroy(self, *args):
                 self.window.quit()
         self.window = None
 
+    def get_window_title(self):
+        return self.window.wm_title()
+
     def set_window_title(self, title):
         self.window.wm_title(title)
 
@@ -874,7 +877,8 @@ def save_figure(self, *args):
             master=self.window,
             title='Save the figure',
             filetypes = tk_filetypes,
-            defaultextension = defaultextension
+            defaultextension = defaultextension,
+            initialfile=self.canvas.get_default_filename(),
             )
 
         if fname == "" or fname == ():

diff --git a/lib/matplotlib/backends/backend_wx.py b/lib/matplotlib/backends/backend_wx.py
@@ -1603,6 +1603,9 @@ def destroy(self, *args):
         #wx.GetApp().ProcessIdle()
         wx.WakeUpIdle()
 
+    def get_window_title(self):
+        return self.window.GetTitle()
+
     def set_window_title(self, title):
         self.window.SetTitle(title)
 
@@ -1840,7 +1843,7 @@ def configure_subplots(self, evt):
     def save_figure(self, *args):
         # Fetch the required filename and file type.
         filetypes, exts, filter_index = self.canvas._get_imagesave_wildcards()
-        default_file = "image." + self.canvas.get_default_filetype()
+        default_file = self.canvas.get_default_filename()
         dlg = wx.FileDialog(self._parent, "Save to file", "", default_file,
                             filetypes,
                             wx.SAVE|wx.OVERWRITE_PROMPT)