Merge pull request matplotlib#21681 from anntzer/spt

Bind subplot_tool more closely to target figure.

Author: greglucas

lib/matplotlib/backend_bases.py

@@ -3258,9 +3258,24 @@ def _update_view(self):
         self.canvas.draw_idle()
 
     def configure_subplots(self, *args):
+        if hasattr(self, "subplot_tool"):
+            self.subplot_tool.figure.canvas.manager.show()
+            return
         plt = _safe_pyplot_import()
-        self.subplot_tool = plt.subplot_tool(self.canvas.figure)
-        self.subplot_tool.figure.canvas.manager.show()
+        with mpl.rc_context({"toolbar": "none"}):  # No navbar for the toolfig.
+            # Use new_figure_manager() instead of figure() so that the figure
+            # doesn't get registered with pyplot.
+            manager = plt.new_figure_manager(-1, (6, 3))
+        manager.set_window_title("Subplot configuration tool")
+        tool_fig = manager.canvas.figure
+        tool_fig.subplots_adjust(top=0.9)
+        self.subplot_tool = widgets.SubplotTool(self.canvas.figure, tool_fig)
+        tool_fig.canvas.mpl_connect(
+            "close_event", lambda e: delattr(self, "subplot_tool"))
+        self.canvas.mpl_connect(
+            "close_event", lambda e: manager.destroy())
+        manager.show()
+        return self.subplot_tool
 
     def save_figure(self, *args):
         """Save the current figure."""

lib/matplotlib/backends/backend_qt.py

@@ -750,11 +750,14 @@ def remove_rubberband(self):
         self.canvas.drawRectangle(None)
 
     def configure_subplots(self):
-        image = str(cbook._get_data_path('images/matplotlib.png'))
-        self._subplot_dialog = SubplotToolQt(
-            self.canvas.figure, self.canvas.parent())
-        self._subplot_dialog.setWindowIcon(QtGui.QIcon(image))
+        if self._subplot_dialog is None:
+            self._subplot_dialog = SubplotToolQt(
+                self.canvas.figure, self.canvas.parent())
+            self.canvas.mpl_connect(
+                "close_event", lambda e: self._subplot_dialog.reject())
+        self._subplot_dialog.update_from_current_subplotpars()
         self._subplot_dialog.show()
+        return self._subplot_dialog
 
     def save_figure(self, *args):
         filetypes = self.canvas.get_supported_filetypes_grouped()
@@ -799,6 +802,8 @@ def set_history_buttons(self):
 class SubplotToolQt(QtWidgets.QDialog):
     def __init__(self, targetfig, parent):
         super().__init__()
+        self.setWindowIcon(QtGui.QIcon(
+            str(cbook._get_data_path("images/matplotlib.png"))))
         self.setObjectName("SubplotTool")
         self._spinboxes = {}
         main_layout = QtWidgets.QHBoxLayout()
@@ -819,7 +824,6 @@ def __init__(self, targetfig, parent):
             inner = QtWidgets.QFormLayout(box)
             for name in spinboxes:
                 self._spinboxes[name] = spinbox = QtWidgets.QDoubleSpinBox()
-                spinbox.setValue(getattr(targetfig.subplotpars, name))
                 spinbox.setRange(0, 1)
                 spinbox.setDecimals(3)
                 spinbox.setSingleStep(0.005)
@@ -836,9 +840,14 @@ def __init__(self, targetfig, parent):
                 if name == "Close":
                     button.setFocus()
         self._figure = targetfig
-        self._defaults = {spinbox: vars(self._figure.subplotpars)[attr]
-                          for attr, spinbox in self._spinboxes.items()}
+        self._defaults = {}
         self._export_values_dialog = None
+        self.update_from_current_subplotpars()
+
+    def update_from_current_subplotpars(self):
+        self._defaults = {spinbox: getattr(self._figure.subplotpars, name)
+                          for name, spinbox in self._spinboxes.items()}
+        self._reset()  # Set spinbox current values without triggering signals.
 
     def _export_values(self):
         # Explicitly round to 3 decimals (which is also the spinbox precision)

lib/matplotlib/pyplot.py

@@ -74,7 +74,7 @@
 from matplotlib.lines import Line2D
 from matplotlib.text import Text, Annotation
 from matplotlib.patches import Polygon, Rectangle, Circle, Arrow
-from matplotlib.widgets import SubplotTool, Button, Slider, Widget
+from matplotlib.widgets import Button, Slider, Widget
 
 from .ticker import (
     TickHelper, Formatter, FixedFormatter, NullFormatter, FuncFormatter,
@@ -1627,20 +1627,20 @@ def subplot_tool(targetfig=None):
     """
     Launch a subplot tool window for a figure.
 
-    A `matplotlib.widgets.SubplotTool` instance is returned. You must maintain
-    a reference to the instance to keep the associated callbacks alive.
+    Returns
+    -------
+    `matplotlib.widgets.SubplotTool`
     """
     if targetfig is None:
         targetfig = gcf()
-    with rc_context({"toolbar": "none"}):  # No navbar for the toolfig.
-        # Use new_figure_manager() instead of figure() so that the figure
-        # doesn't get registered with pyplot.
-        manager = new_figure_manager(-1, (6, 3))
-    manager.set_window_title("Subplot configuration tool")
-    tool_fig = manager.canvas.figure
-    tool_fig.subplots_adjust(top=0.9)
-    manager.show()
-    return SubplotTool(targetfig, tool_fig)
+    tb = targetfig.canvas.manager.toolbar
+    if hasattr(tb, "configure_subplots"):  # toolbar2
+        return tb.configure_subplots()
+    elif hasattr(tb, "trigger_tool"):  # toolmanager
+        return tb.trigger_tool("subplots")
+    else:
+        raise ValueError("subplot_tool can only be launched for figures with "
+                         "an associated toolbar")
 
 
 def box(on=None):