matplotlib · QuLogic · May 5, 2020 · Mar 31, 2020 · Mar 31, 2020 · Mar 31, 2020
diff --git a/lib/matplotlib/backends/backend_macosx.py b/lib/matplotlib/backends/backend_macosx.py
@@ -46,12 +46,14 @@ def __init__(self, figure):
         FigureCanvasBase.__init__(self, figure)
         width, height = self.get_width_height()
         _macosx.FigureCanvas.__init__(self, width, height)
-        self._device_scale = 1.0
+        self._dpi_ratio = 1.0
 
     def _set_device_scale(self, value):
-        if self._device_scale != value:
-            self.figure.dpi = self.figure.dpi / self._device_scale * value
-            self._device_scale = value
+        if self._dpi_ratio != value:
+            # Need the new value in place before setting figure.dpi, which
+            # will trigger a resize
+            self._dpi_ratio, old_value = value, self._dpi_ratio
+            self.figure.dpi = self.figure.dpi / old_value * self._dpi_ratio
 
     def _draw(self):
         renderer = self.get_renderer(cleared=self.figure.stale)
@@ -77,8 +79,8 @@ def resize(self, width, height):
         dpi = self.figure.dpi
         width /= dpi
         height /= dpi
-        self.figure.set_size_inches(width * self._device_scale,
-                                    height * self._device_scale,
+        self.figure.set_size_inches(width * self._dpi_ratio,
+                                    height * self._dpi_ratio,
                                     forward=False)
         FigureCanvasBase.resize_event(self)
         self.draw_idle()

diff --git a/src/_macosx.m b/src/_macosx.m
@@ -204,7 +204,6 @@ - (void)close;
 @interface View : NSView <NSWindowDelegate>
 {   PyObject* canvas;
     NSRect rubberband;
-    BOOL inside;
     NSTrackingRectTag tracking;
     @public double device_scale;
 }
@@ -337,6 +336,14 @@ static CGFloat _get_device_scale(CGContextRef cr)
 
     NSRect rect = NSMakeRect(0.0, 0.0, width, height);
     self->view = [self->view initWithFrame: rect];
+    self->view.autoresizingMask = NSViewWidthSizable | NSViewHeightSizable;
+    int opts = (NSTrackingMouseEnteredAndExited | NSTrackingMouseMoved |
+                NSTrackingActiveInKeyWindow | NSTrackingInVisibleRect);
+    [self->view addTrackingArea: [
+        [NSTrackingArea alloc] initWithRect: rect
+                                    options: opts
+                                      owner: self->view
+                                   userInfo: nil]];
     [self->view setCanvas: (PyObject*)self];
     return 0;
 }
@@ -704,7 +711,6 @@ static CGFloat _get_device_scale(CGContextRef cr)
     [window setTitle: [NSString stringWithCString: title
                                          encoding: NSASCIIStringEncoding]];
 
-    [window setAcceptsMouseMovedEvents: YES];
     [window setDelegate: view];
     [window makeFirstResponder: view];
     [[window contentView] addSubview: view];
@@ -804,6 +810,22 @@ static CGFloat _get_device_scale(CGContextRef cr)
     }
 }
 
+static PyObject*
+FigureManager_resize(FigureManager* self, PyObject *args, PyObject *kwds)
+{
+    int width, height;
+    if (!PyArg_ParseTuple(args, "ii", &width, &height)) {
+        return NULL;
+    }
+    Window* window = self->window;
+    if(window)
+    {
+        // 36 comes from hard-coded size of toolbar later in code
+        [window setContentSize: NSMakeSize(width, height + 36.)];
+    }
+    Py_RETURN_NONE;
+}
+
 static PyMethodDef FigureManager_methods[] = {
     {"show",
      (PyCFunction)FigureManager_show,
@@ -825,6 +847,11 @@ static CGFloat _get_device_scale(CGContextRef cr)
      METH_NOARGS,
      "Returns the title of the window associated with the figure manager."
     },
+    {"resize",
+     (PyCFunction)FigureManager_resize,
+     METH_VARARGS,
+     "Resize the window (in pixels)."
+    },
     {NULL}  /* Sentinel */
 };
 
@@ -1564,8 +1591,6 @@ - (View*)initWithFrame:(NSRect)rect
 {
     self = [super initWithFrame: rect];
     rubberband = NSZeroRect;
-    inside = false;
-    tracking = 0;
     device_scale = 1;
     return self;
 }
@@ -1574,7 +1599,6 @@ - (void)dealloc
 {
     FigureCanvas* fc = (FigureCanvas*)canvas;
     if (fc) fc->view = NULL;
-    [self removeTrackingRect: tracking];
     [super dealloc];
 }
 
@@ -1703,8 +1727,6 @@ - (void)windowDidResize: (NSNotification*)notification
     width = size.width;
     height = size.height;
 
-    [self setFrameSize: size];
-
     PyGILState_STATE gstate = PyGILState_Ensure();
     PyObject* result = PyObject_CallMethod(
             canvas, "resize", "ii", width, height);
@@ -1713,11 +1735,6 @@ - (void)windowDidResize: (NSNotification*)notification
     else
         PyErr_Print();
     PyGILState_Release(gstate);
-    if (tracking) [self removeTrackingRect: tracking];
-    tracking = [self addTrackingRect: [self bounds]
-                               owner: self
-                            userData: nil
-                        assumeInside: NO];
     [self setNeedsDisplay: YES];
 }
 
@@ -1760,8 +1777,6 @@ - (void)mouseEntered:(NSEvent *)event
 {
     PyGILState_STATE gstate;
     PyObject* result;
-    NSWindow* window = [self window];
-    if ([window isKeyWindow]==false) return;
 
     int x, y;
     NSPoint location = [event locationInWindow];
@@ -1778,29 +1793,20 @@ - (void)mouseEntered:(NSEvent *)event
     else
         PyErr_Print();
     PyGILState_Release(gstate);
-
-    [window setAcceptsMouseMovedEvents: YES];
-    inside = true;
 }
 
 - (void)mouseExited:(NSEvent *)event
 {
     PyGILState_STATE gstate;
     PyObject* result;
-    NSWindow* window = [self window];
-    if ([window isKeyWindow]==false) return;
 
-    if (inside==false) return;
     gstate = PyGILState_Ensure();
     result = PyObject_CallMethod(canvas, "leave_notify_event", "");
     if(result)
         Py_DECREF(result);
     else
         PyErr_Print();
     PyGILState_Release(gstate);
-
-    [[self window] setAcceptsMouseMovedEvents: NO];
-    inside = false;
 }
 
 - (void)mouseDown:(NSEvent *)event