Add background to onscreen message

ginga/ImageView.py

@@ -3641,21 +3641,24 @@ def set_onscreen_message(self, text, redraw=True):
             message = canvas.get_object_by_tag(tag)
             if text is None:
                 message.text = ''
+                message.bgalpha = 0.0
             else:
                 message.x = x
                 message.y = y
                 message.text = text
                 message.fontsize = font_size
+                message.bgalpha = 1.0
 
         except KeyError:
             if text is None:
                 text = ''
             Text = canvas.get_draw_class('text')
             canvas.add(Text(x, y, text=text,
                             font=font, fontsize=font_size,
-                            #color='black', alpha=1.0, linewidth=1,
-                            fill=True,
-                            fillcolor=self.img_fg, fillalpha=1.0,
+                            #color='black', alpha=0.0, linewidth=0,
+                            fill=True, fillcolor=self.img_fg, fillalpha=1.0,
+                            bgcolor='black', bgalpha=1.0,
+                            borderlinewidth=0,
                             coord='window'),
                        tag=tag, redraw=False)
 

ginga/gw/PlotView.py

@@ -982,10 +982,12 @@ def plot_do_pan(self, cb_obj, event):
         """Can be set as the callback function for the 'button-press'
         event to pan the plot with middle-click.
         """
-        if event.button == 0x2:
+        cur_x, cur_y = event.data_x, event.data_y
+
+        if event.button == 0x2 or (event.button == 0x1 and
+                                   'shift' in event.modifiers):
             if not self.can.pan:
                 return
-            cur_x, cur_y = event.data_x, event.data_y
             if None not in [cur_x, cur_y]:
                 self.set_pan(cur_x, cur_y)
 

setup.cfg

@@ -61,8 +61,8 @@ setup_requires = setuptools_scm
 [options.extras_require]
 recommended =
     scipy>=0.18.1
-    matplotlib>=3.4
-    opencv-python>=4.5.4.58
+    matplotlib>=3.8
+    opencv-python-headless>=4.5.4.58
     exifread>=2.3.2
     astroquery>=0.3.5
     python-dateutil>=2.8.2