examples: Turn most QPainter instances into context managers

After the new context manager is in place, most of
the examples benefit from moving QPainter into a
`with` statement.

The comments concerning PyPy could be removed, again.

[ChangeLog][PySide6] The examples are updated to use the new
context manager for QPainter.

Task-number: PYSIDE-535
Change-Id: Idf7e1f734d549ed663383ffbb2416297ebb1e0c7
Reviewed-by: Christian Tismer <tismer@stackless.com>

22 files changed, 266 insertions, 322 deletions

diff --git a/examples/widgets/animation/easing/easing.py b/examples/widgets/animation/easing/easing.py
index a7bff7842..362839079 100644
--- a/examples/widgets/animation/easing/easing.py
+++ b/examples/widgets/animation/easing/easing.py
@@ -154,7 +154,6 @@ class Window(QWidget):
 
     def create_curve_icons(self):
         pix = QPixmap(self._iconSize)
-        painter = QPainter()
 
         gradient = QLinearGradient(0, 0, 0, self._iconSize.height())
         gradient.setColorAt(0.0, QColor(240, 240, 240))
@@ -172,54 +171,51 @@ class Window(QWidget):
                             and c != QEasingCurve.TCBSpline)]
         curve_types.sort(key=lambda ct: ct[1])
 
-        painter.begin(pix)
-
-        for curve_name, curve_type in curve_types:
-            painter.fillRect(QRect(QPoint(0, 0), self._iconSize), brush)
-            curve = QEasingCurve(curve_type)
-
-            painter.setPen(QColor(0, 0, 255, 64))
-            x_axis = self._iconSize.height() / 1.5
-            y_axis = self._iconSize.width() / 3.0
-            painter.drawLine(0, x_axis, self._iconSize.width(), x_axis)
-            painter.drawLine(y_axis, 0, y_axis, self._iconSize.height())
-
-            curve_scale = self._iconSize.height() / 2.0
-
-            painter.setPen(Qt.NoPen)
-
-            # Start point.
-            painter.setBrush(Qt.red)
-            start = QPoint(y_axis,
-                    x_axis - curve_scale * curve.valueForProgress(0))
-            painter.drawRect(start.x() - 1, start.y() - 1, 3, 3)
-
-            # End point.
-            painter.setBrush(Qt.blue)
-            end = QPoint(y_axis + curve_scale,
-                    x_axis - curve_scale * curve.valueForProgress(1))
-            painter.drawRect(end.x() - 1, end.y() - 1, 3, 3)
-
-            curve_path = QPainterPath()
-            curve_path.moveTo(QPointF(start))
-            t = 0.0
-            while t <= 1.0:
-                to = QPointF(y_axis + curve_scale * t,
-                        x_axis - curve_scale * curve.valueForProgress(t))
-                curve_path.lineTo(to)
-                t += 1.0 / curve_scale
-
-            painter.setRenderHint(QPainter.Antialiasing, True)
-            painter.strokePath(curve_path, QColor(32, 32, 32))
-            painter.setRenderHint(QPainter.Antialiasing, False)
-
-            item = QListWidgetItem()
-            item.setIcon(QIcon(pix))
-            item.setText(curve_name)
-            self._ui.easingCurvePicker.addItem(item)
-
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(pix) as painter:
+
+            for curve_name, curve_type in curve_types:
+                painter.fillRect(QRect(QPoint(0, 0), self._iconSize), brush)
+                curve = QEasingCurve(curve_type)
+
+                painter.setPen(QColor(0, 0, 255, 64))
+                x_axis = self._iconSize.height() / 1.5
+                y_axis = self._iconSize.width() / 3.0
+                painter.drawLine(0, x_axis, self._iconSize.width(), x_axis)
+                painter.drawLine(y_axis, 0, y_axis, self._iconSize.height())
+
+                curve_scale = self._iconSize.height() / 2.0
+
+                painter.setPen(Qt.NoPen)
+
+                # Start point.
+                painter.setBrush(Qt.red)
+                start = QPoint(y_axis,
+                        x_axis - curve_scale * curve.valueForProgress(0))
+                painter.drawRect(start.x() - 1, start.y() - 1, 3, 3)
+
+                # End point.
+                painter.setBrush(Qt.blue)
+                end = QPoint(y_axis + curve_scale,
+                        x_axis - curve_scale * curve.valueForProgress(1))
+                painter.drawRect(end.x() - 1, end.y() - 1, 3, 3)
+
+                curve_path = QPainterPath()
+                curve_path.moveTo(QPointF(start))
+                t = 0.0
+                while t <= 1.0:
+                    to = QPointF(y_axis + curve_scale * t,
+                            x_axis - curve_scale * curve.valueForProgress(t))
+                    curve_path.lineTo(to)
+                    t += 1.0 / curve_scale
+
+                painter.setRenderHint(QPainter.Antialiasing, True)
+                painter.strokePath(curve_path, QColor(32, 32, 32))
+                painter.setRenderHint(QPainter.Antialiasing, False)
+
+                item = QListWidgetItem()
+                item.setIcon(QIcon(pix))
+                item.setText(curve_name)
+                self._ui.easingCurvePicker.addItem(item)
 
     def start_animation(self):
         self._anim.setStartValue(QPointF(0, 0))
diff --git a/examples/widgets/codeeditor/codeeditor.py b/examples/widgets/codeeditor/codeeditor.py
index bfe92c4a8..47dc8b0a3 100644
--- a/examples/widgets/codeeditor/codeeditor.py
+++ b/examples/widgets/codeeditor/codeeditor.py
@@ -85,29 +85,26 @@ class CodeEditor(QPlainTextEdit):
         self.line_number_area.setGeometry(rect)
 
     def lineNumberAreaPaintEvent(self, event):
-        painter = QPainter(self.line_number_area)
-        painter.fillRect(event.rect(), Qt.lightGray)
-        block = self.firstVisibleBlock()
-        block_number = block.blockNumber()
-        offset = self.contentOffset()
-        top = self.blockBoundingGeometry(block).translated(offset).top()
-        bottom = top + self.blockBoundingRect(block).height()
-
-        while block.isValid() and top <= event.rect().bottom():
-            if block.isVisible() and bottom >= event.rect().top():
-                number = str(block_number + 1)
-                painter.setPen(Qt.black)
-                width = self.line_number_area.width()
-                height = self.fontMetrics().height()
-                painter.drawText(0, top, width, height, Qt.AlignRight, number)
-
-            block = block.next()
-            top = bottom
+        with QPainter(self.line_number_area) as painter:
+            painter.fillRect(event.rect(), Qt.lightGray)
+            block = self.firstVisibleBlock()
+            block_number = block.blockNumber()
+            offset = self.contentOffset()
+            top = self.blockBoundingGeometry(block).translated(offset).top()
             bottom = top + self.blockBoundingRect(block).height()
-            block_number += 1
 
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+            while block.isValid() and top <= event.rect().bottom():
+                if block.isVisible() and bottom >= event.rect().top():
+                    number = str(block_number + 1)
+                    painter.setPen(Qt.black)
+                    width = self.line_number_area.width()
+                    height = self.fontMetrics().height()
+                    painter.drawText(0, top, width, height, Qt.AlignRight, number)
+
+                block = block.next()
+                top = bottom
+                bottom = top + self.blockBoundingRect(block).height()
+                block_number += 1
 
     @Slot()
     def update_line_number_area_width(self, newBlockCount):
diff --git a/examples/widgets/draganddrop/draggableicons/draggableicons.py b/examples/widgets/draganddrop/draggableicons/draggableicons.py
index 5fe6590e7..b3b4a56e5 100644
--- a/examples/widgets/draganddrop/draggableicons/draggableicons.py
+++ b/examples/widgets/draganddrop/draggableicons/draggableicons.py
@@ -139,10 +139,8 @@ class DragWidget(QFrame):
 
         # .copy() is important: python is different than c++ in this case
         temp_pixmap = pixmap.copy()
-        painter = QPainter()
-        painter.begin(temp_pixmap)
-        painter.fillRect(pixmap.rect(), QColor(127, 127, 127, 127))
-        painter.end()
+        with QPainter(temp_pixmap) as painter:
+            painter.fillRect(pixmap.rect(), QColor(127, 127, 127, 127))
 
         child.setPixmap(temp_pixmap)
 
@@ -152,9 +150,6 @@ class DragWidget(QFrame):
             child.show()
             child.setPixmap(pixmap)
 
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
-
 
 if __name__ == "__main__":
     app = QApplication(sys.argv)
diff --git a/examples/widgets/effects/lighting/lighting.py b/examples/widgets/effects/lighting/lighting.py
index ec8f945e1..be34464dd 100644
--- a/examples/widgets/effects/lighting/lighting.py
+++ b/examples/widgets/effects/lighting/lighting.py
@@ -89,11 +89,10 @@ class Lighting(QGraphicsView):
         pixmap = QPixmap(60, 60)
         pixmap.fill(Qt.transparent)
 
-        painter = QPainter(pixmap)
-        painter.setPen(Qt.NoPen)
-        painter.setBrush(radial_grad)
-        painter.drawEllipse(0, 0, 60, 60)
-        painter.end()
+        with QPainter(pixmap) as painter:
+            painter.setPen(Qt.NoPen)
+            painter.setBrush(radial_grad)
+            painter.drawEllipse(0, 0, 60, 60)
 
         self.m_lightSource = self.m_scene.addPixmap(pixmap)
         self.m_lightSource.setZValue(2)
diff --git a/examples/widgets/graphicsview/diagramscene/diagramscene.py b/examples/widgets/graphicsview/diagramscene/diagramscene.py
index aca95ccb9..a7980eec1 100644
--- a/examples/widgets/graphicsview/diagramscene/diagramscene.py
+++ b/examples/widgets/graphicsview/diagramscene/diagramscene.py
@@ -238,12 +238,10 @@ class DiagramItem(QGraphicsPolygonItem):
     def image(self):
         pixmap = QPixmap(250, 250)
         pixmap.fill(Qt.transparent)
-        painter = QPainter(pixmap)
-        painter.setPen(QPen(Qt.black, 8))
-        painter.translate(125, 125)
-        painter.drawPolyline(self._my_polygon)
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(pixmap) as painter:
+            painter.setPen(QPen(Qt.black, 8))
+            painter.translate(125, 125)
+            painter.drawPolyline(self._my_polygon)
         return pixmap
 
     def contextMenuEvent(self, event):
@@ -808,22 +806,22 @@ class MainWindow(QMainWindow):
     def create_color_tool_button_icon(self, imageFile, color):
         pixmap = QPixmap(50, 80)
         pixmap.fill(Qt.transparent)
-        painter = QPainter(pixmap)
-        image = QPixmap(imageFile)
-        target = QRect(0, 0, 50, 60)
-        source = QRect(0, 0, 42, 42)
-        painter.fillRect(QRect(0, 60, 50, 80), color)
-        painter.drawPixmap(target, image, source)
-        painter.end()
+
+        with QPainter(pixmap) as painter:
+            image = QPixmap(imageFile)
+            target = QRect(0, 0, 50, 60)
+            source = QRect(0, 0, 42, 42)
+            painter.fillRect(QRect(0, 60, 50, 80), color)
+            painter.drawPixmap(target, image, source)
 
         return QIcon(pixmap)
 
     def create_color_icon(self, color):
         pixmap = QPixmap(20, 20)
-        painter = QPainter(pixmap)
-        painter.setPen(Qt.NoPen)
-        painter.fillRect(QRect(0, 0, 20, 20), color)
-        painter.end()
+
+        with QPainter(pixmap) as painter:
+            painter.setPen(Qt.NoPen)
+            painter.fillRect(QRect(0, 0, 20, 20), color)
 
         return QIcon(pixmap)
 
diff --git a/examples/widgets/graphicsview/dragdroprobot/dragdroprobot.py b/examples/widgets/graphicsview/dragdroprobot/dragdroprobot.py
index 4f074aa19..4c916f521 100644
--- a/examples/widgets/graphicsview/dragdroprobot/dragdroprobot.py
+++ b/examples/widgets/graphicsview/dragdroprobot/dragdroprobot.py
@@ -113,11 +113,10 @@ class ColorItem(QGraphicsItem):
             pixmap = QPixmap(34, 34)
             pixmap.fill(Qt.white)
 
-            painter = QPainter(pixmap)
-            painter.translate(15, 15)
-            painter.setRenderHint(QPainter.Antialiasing)
-            self.paint(painter, None, None)
-            painter.end()
+            with QPainter(pixmap) as painter:
+                painter.translate(15, 15)
+                painter.setRenderHint(QPainter.Antialiasing)
+                self.paint(painter, None, None)
 
             pixmap.setMask(pixmap.createHeuristicMask())
 
diff --git a/examples/widgets/imageviewer/imageviewer.py b/examples/widgets/imageviewer/imageviewer.py
index ebcae5fa4..177c7d026 100644
--- a/examples/widgets/imageviewer/imageviewer.py
+++ b/examples/widgets/imageviewer/imageviewer.py
@@ -155,15 +155,14 @@ class ImageViewer(QMainWindow):
         printer = QPrinter()
         dialog = QPrintDialog(printer, self)
         if dialog.exec() == QDialog.Accepted:
-            painter = QPainter(printer)
-            pixmap = self._image_label.pixmap()
-            rect = painter.viewport()
-            size = pixmap.size()
-            size.scale(rect.size(), Qt.KeepAspectRatio)
-            painter.setViewport(rect.x(), rect.y(), size.width(), size.height())
-            painter.setWindow(pixmap.rect())
-            painter.drawPixmap(0, 0, pixmap)
-            painter.end()
+            with QPainter(printer) as painter:
+                pixmap = self._image_label.pixmap()
+                rect = painter.viewport()
+                size = pixmap.size()
+                size.scale(rect.size(), Qt.KeepAspectRatio)
+                painter.setViewport(rect.x(), rect.y(), size.width(), size.height())
+                painter.setWindow(pixmap.rect())
+                painter.drawPixmap(0, 0, pixmap)
 
     @Slot()
     def _copy(self):
diff --git a/examples/widgets/itemviews/stardelegate/stareditor.py b/examples/widgets/itemviews/stardelegate/stareditor.py
index 9e3a5f4df..93027276c 100644
--- a/examples/widgets/itemviews/stardelegate/stareditor.py
+++ b/examples/widgets/itemviews/stardelegate/stareditor.py
@@ -70,10 +70,8 @@ class StarEditor(QWidget):
 
     def paintEvent(self, event):
         """ Paint the editor, offloading the work to the StarRating class. """
-        painter = QPainter(self)
-        self.star_rating.paint(painter, self.rect(), self.palette(), isEditable=True)
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(self) as painter:
+            self.star_rating.paint(painter, self.rect(), self.palette(), isEditable=True)
 
     def mouseMoveEvent(self, event):
         """ As the mouse moves inside the editor, track the position and
diff --git a/examples/widgets/painting/basicdrawing/basicdrawing.py b/examples/widgets/painting/basicdrawing/basicdrawing.py
index a0d5bda7c..e89d694fe 100644
--- a/examples/widgets/painting/basicdrawing/basicdrawing.py
+++ b/examples/widgets/painting/basicdrawing/basicdrawing.py
@@ -114,58 +114,56 @@ class RenderArea(QWidget):
         start_angle = 30 * 16
         arc_length = 120 * 16
 
-        painter = QPainter(self)
-        painter.setPen(self.pen)
-        painter.setBrush(self.brush)
-        if self.antialiased:
-            painter.setRenderHint(QPainter.Antialiasing)
-
-        for x in range(0, self.width(), 100):
-            for y in range(0, self.height(), 100):
-                painter.save()
-                painter.translate(x, y)
-                if self.transformed:
-                    painter.translate(50, 50)
-                    painter.rotate(60.0)
-                    painter.scale(0.6, 0.9)
-                    painter.translate(-50, -50)
-
-                if self.shape == RenderArea.Line:
-                    painter.drawLine(rect.bottomLeft(), rect.topRight())
-                elif self.shape == RenderArea.Points:
-                    painter.drawPoints(RenderArea.points)
-                elif self.shape == RenderArea.Polyline:
-                    painter.drawPolyline(RenderArea.points)
-                elif self.shape == RenderArea.Polygon:
-                    painter.drawPolygon(RenderArea.points)
-                elif self.shape == RenderArea.Rect:
-                    painter.drawRect(rect)
-                elif self.shape == RenderArea.RoundedRect:
-                    painter.drawRoundedRect(rect, 25, 25, Qt.RelativeSize)
-                elif self.shape == RenderArea.Ellipse:
-                    painter.drawEllipse(rect)
-                elif self.shape == RenderArea.Arc:
-                    painter.drawArc(rect, start_angle, arc_length)
-                elif self.shape == RenderArea.Chord:
-                    painter.drawChord(rect, start_angle, arc_length)
-                elif self.shape == RenderArea.Pie:
-                    painter.drawPie(rect, start_angle, arc_length)
-                elif self.shape == RenderArea.Path:
-                    painter.drawPath(path)
-                elif self.shape == RenderArea.Text:
-                    qv = qVersion()
-                    painter.drawText(rect, Qt.AlignCenter,
-                                     f"PySide 6\nQt {qv}")
-                elif self.shape == RenderArea.Pixmap:
-                    painter.drawPixmap(10, 10, self.pixmap)
-
-                painter.restore()
-
-        painter.setPen(self.palette().dark().color())
-        painter.setBrush(Qt.NoBrush)
-        painter.drawRect(QRect(0, 0, self.width() - 1, self.height() - 1))
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(self) as painter:
+            painter.setPen(self.pen)
+            painter.setBrush(self.brush)
+            if self.antialiased:
+                painter.setRenderHint(QPainter.Antialiasing)
+
+            for x in range(0, self.width(), 100):
+                for y in range(0, self.height(), 100):
+                    painter.save()
+                    painter.translate(x, y)
+                    if self.transformed:
+                        painter.translate(50, 50)
+                        painter.rotate(60.0)
+                        painter.scale(0.6, 0.9)
+                        painter.translate(-50, -50)
+
+                    if self.shape == RenderArea.Line:
+                        painter.drawLine(rect.bottomLeft(), rect.topRight())
+                    elif self.shape == RenderArea.Points:
+                        painter.drawPoints(RenderArea.points)
+                    elif self.shape == RenderArea.Polyline:
+                        painter.drawPolyline(RenderArea.points)
+                    elif self.shape == RenderArea.Polygon:
+                        painter.drawPolygon(RenderArea.points)
+                    elif self.shape == RenderArea.Rect:
+                        painter.drawRect(rect)
+                    elif self.shape == RenderArea.RoundedRect:
+                        painter.drawRoundedRect(rect, 25, 25, Qt.RelativeSize)
+                    elif self.shape == RenderArea.Ellipse:
+                        painter.drawEllipse(rect)
+                    elif self.shape == RenderArea.Arc:
+                        painter.drawArc(rect, start_angle, arc_length)
+                    elif self.shape == RenderArea.Chord:
+                        painter.drawChord(rect, start_angle, arc_length)
+                    elif self.shape == RenderArea.Pie:
+                        painter.drawPie(rect, start_angle, arc_length)
+                    elif self.shape == RenderArea.Path:
+                        painter.drawPath(path)
+                    elif self.shape == RenderArea.Text:
+                        qv = qVersion()
+                        painter.drawText(rect, Qt.AlignCenter,
+                                         f"PySide 6\nQt {qv}")
+                    elif self.shape == RenderArea.Pixmap:
+                        painter.drawPixmap(10, 10, self.pixmap)
+
+                    painter.restore()
+
+            painter.setPen(self.palette().dark().color())
+            painter.setBrush(Qt.NoBrush)
+            painter.drawRect(QRect(0, 0, self.width() - 1, self.height() - 1))
 
 
 id_role = Qt.UserRole
diff --git a/examples/widgets/painting/concentriccircles/concentriccircles.py b/examples/widgets/painting/concentriccircles/concentriccircles.py
index 2786396cb..c6bada0a6 100644
--- a/examples/widgets/painting/concentriccircles/concentriccircles.py
+++ b/examples/widgets/painting/concentriccircles/concentriccircles.py
@@ -78,25 +78,22 @@ class CircleWidget(QWidget):
         self.update()
 
     def paintEvent(self, event):
-        painter = QPainter(self)
-        painter.setRenderHint(QPainter.Antialiasing, self.antialiased)
-        painter.translate(self.width() / 2, self.height() / 2)
-
-        for diameter in range(0, 256, 9):
-            delta = abs((self._frame_no % 128) - diameter / 2)
-            alpha = 255 - (delta * delta) / 4 - diameter
-            if alpha > 0:
-                painter.setPen(QPen(QColor(0, diameter / 2, 127, alpha), 3))
-
-                if self._float_based:
-                    painter.drawEllipse(QRectF(-diameter / 2.0,
-                            -diameter / 2.0, diameter, diameter))
-                else:
-                    painter.drawEllipse(QRect(-diameter / 2,
-                            -diameter / 2, diameter, diameter))
-
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(self) as painter:
+            painter.setRenderHint(QPainter.Antialiasing, self.antialiased)
+            painter.translate(self.width() / 2, self.height() / 2)
+
+            for diameter in range(0, 256, 9):
+                delta = abs((self._frame_no % 128) - diameter / 2)
+                alpha = 255 - (delta * delta) / 4 - diameter
+                if alpha > 0:
+                    painter.setPen(QPen(QColor(0, diameter / 2, 127, alpha), 3))
+
+                    if self._float_based:
+                        painter.drawEllipse(QRectF(-diameter / 2.0,
+                                -diameter / 2.0, diameter, diameter))
+                    else:
+                        painter.drawEllipse(QRect(-diameter / 2,
+                                -diameter / 2, diameter, diameter))
 
 
 class Window(QWidget):
diff --git a/examples/widgets/painting/painter/painter.py b/examples/widgets/painting/painter/painter.py
index 3d5d95f10..6626afb7a 100644
--- a/examples/widgets/painting/painter/painter.py
+++ b/examples/widgets/painting/painter/painter.py
@@ -88,10 +88,8 @@ class PainterWidget(QWidget):
         Paint the Pixmap into the widget
 
         """
-        painter = QPainter()
-        painter.begin(self)
-        painter.drawPixmap(0, 0, self.pixmap)
-        painter.end()
+        with QPainter(self) as painter:
+            painter.drawPixmap(0, 0, self.pixmap)
 
     def mousePressEvent(self, event: QMouseEvent):
         """Override from QWidget
diff --git a/examples/widgets/painting/plot/plot.py b/examples/widgets/painting/plot/plot.py
index a125c3253..30dc3e504 100644
--- a/examples/widgets/painting/plot/plot.py
+++ b/examples/widgets/painting/plot/plot.py
@@ -88,13 +88,11 @@ class PlotWidget(QWidget):
         self.update()
 
     def paintEvent(self, event):
-        painter = QPainter()
-        painter.begin(self)
-        rect = QRect(QPoint(0, 0), self.size())
-        painter.fillRect(rect, Qt.white)
-        painter.translate(-self._points[0].x(), 0)
-        painter.drawPolyline(self._points)
-        painter.end()
+        with QPainter(self) as painter:
+            rect = QRect(QPoint(0, 0), self.size())
+            painter.fillRect(rect, Qt.white)
+            painter.translate(-self._points[0].x(), 0)
+            painter.drawPolyline(self._points)
 
 
 if __name__ == "__main__":
diff --git a/examples/widgets/state-machine/rogue/rogue.py b/examples/widgets/state-machine/rogue/rogue.py
index 255785f95..19394542a 100644
--- a/examples/widgets/state-machine/rogue/rogue.py
+++ b/examples/widgets/state-machine/rogue/rogue.py
@@ -161,27 +161,25 @@ class MainWindow(QMainWindow):
 
     def paintEvent(self, event):
         metrics = QFontMetrics(self.font())
-        painter = QPainter(self)
-        font_height = metrics.height()
-        font_width = metrics.horizontalAdvance('X')
-
-        painter.fillRect(self.rect(), Qt.black)
-        painter.setPen(Qt.white)
-
-        y_pos = font_height
-        painter.drawText(QPoint(0, y_pos), self.status)
-        for y in range(self.height):
-            y_pos += font_height
-            x_pos = 0
-            for x in range(self.width):
-                if y == self.pY and x == self.pX:
+        with QPainter(self) as painter:
+            font_height = metrics.height()
+            font_width = metrics.horizontalAdvance('X')
+
+            painter.fillRect(self.rect(), Qt.black)
+            painter.setPen(Qt.white)
+
+            y_pos = font_height
+            painter.drawText(QPoint(0, y_pos), self.status)
+            for y in range(self.height):
+                y_pos += font_height
+                x_pos = 0
+                for x in range(self.width):
+                    if y == self.pY and x == self.pX:
+                        x_pos += font_width
+                        continue
+                    painter.drawText(QPoint(x_pos, y_pos), self.map[x][y])
                     x_pos += font_width
-                    continue
-                painter.drawText(QPoint(x_pos, y_pos), self.map[x][y])
-                x_pos += font_width
-        painter.drawText(QPoint(self.pX * font_width, (self.pY + 2) * font_height), '@')
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+            painter.drawText(QPoint(self.pX * font_width, (self.pY + 2) * font_height), '@')
 
     def move_player(self, direction):
         if direction == self.left:
diff --git a/examples/widgets/state-machine/trafficlight/trafficlight.py b/examples/widgets/state-machine/trafficlight/trafficlight.py
index b5e975cfc..2a35d23ce 100644
--- a/examples/widgets/state-machine/trafficlight/trafficlight.py
+++ b/examples/widgets/state-machine/trafficlight/trafficlight.py
@@ -74,12 +74,10 @@ class LightWidget(QWidget):
     def paintEvent(self, e):
         if not self._on_val:
             return
-        painter = QPainter(self)
-        painter.setRenderHint(QPainter.Antialiasing)
-        painter.setBrush(self.color)
-        painter.drawEllipse(0, 0, self.width(), self.height())
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(self) as painter:
+            painter.setRenderHint(QPainter.Antialiasing)
+            painter.setBrush(self.color)
+            painter.drawEllipse(0, 0, self.width(), self.height())
 
     on = Property(bool, is_on, set_on)
 
diff --git a/examples/widgets/tetrix/tetrix.py b/examples/widgets/tetrix/tetrix.py
index c70e634b4..04a8b5f57 100644
--- a/examples/widgets/tetrix/tetrix.py
+++ b/examples/widgets/tetrix/tetrix.py
@@ -212,32 +212,30 @@ class TetrixBoard(QFrame):
     def paintEvent(self, event):
         super(TetrixBoard, self).paintEvent(event)
 
-        painter = QPainter(self)
-        rect = self.contentsRect()
+        with QPainter(self) as painter:
+            rect = self.contentsRect()
 
-        if self._is_paused:
-            painter.drawText(rect, Qt.AlignCenter, "Pause")
-            return
+            if self._is_paused:
+                painter.drawText(rect, Qt.AlignCenter, "Pause")
+                return
 
-        board_top = rect.bottom() - TetrixBoard.board_height * self.square_height()
+            board_top = rect.bottom() - TetrixBoard.board_height * self.square_height()
 
-        for i in range(TetrixBoard.board_height):
-            for j in range(TetrixBoard.board_width):
-                shape = self.shape_at(j, TetrixBoard.board_height - i - 1)
-                if shape != Piece.NoShape:
-                    self.draw_square(painter,
-                            rect.left() + j * self.square_width(),
-                            board_top + i * self.square_height(), shape)
-
-        if self._cur_piece.shape() != Piece.NoShape:
-            for i in range(4):
-                x = self._cur_x + self._cur_piece.x(i)
-                y = self._cur_y - self._cur_piece.y(i)
-                self.draw_square(painter, rect.left() + x * self.square_width(),
-                        board_top + (TetrixBoard.board_height - y - 1) * self.square_height(),
-                        self._cur_piece.shape())
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+            for i in range(TetrixBoard.board_height):
+                for j in range(TetrixBoard.board_width):
+                    shape = self.shape_at(j, TetrixBoard.board_height - i - 1)
+                    if shape != Piece.NoShape:
+                        self.draw_square(painter,
+                                rect.left() + j * self.square_width(),
+                                board_top + i * self.square_height(), shape)
+
+            if self._cur_piece.shape() != Piece.NoShape:
+                for i in range(4):
+                    x = self._cur_x + self._cur_piece.x(i)
+                    y = self._cur_y - self._cur_piece.y(i)
+                    self.draw_square(painter, rect.left() + x * self.square_width(),
+                            board_top + (TetrixBoard.board_height - y - 1) * self.square_height(),
+                            self._cur_piece.shape())
 
     def keyPressEvent(self, event):
         if not self._is_started or self._is_paused or self._cur_piece.shape() == Piece.NoShape:
@@ -359,10 +357,8 @@ class TetrixBoard(QFrame):
         dy = self._next_piece.max_y() - self._next_piece.min_y() + 1
 
         pixmap = QPixmap(dx * self.square_width(), dy * self.square_height())
-        painter = QPainter(pixmap)
-        painter.fillRect(pixmap.rect(), self.nextPieceLabel.palette().background())
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(pixmap) as painter:
+            painter.fillRect(pixmap.rect(), self.nextPieceLabel.palette().background())
 
         for int in range(4):
             x = self._next_piece.x(i) - self._next_piece.min_x()
diff --git a/examples/widgets/tutorials/cannon/t10.py b/examples/widgets/tutorials/cannon/t10.py
index 98b5f57fe..0e553f8c5 100644
--- a/examples/widgets/tutorials/cannon/t10.py
+++ b/examples/widgets/tutorials/cannon/t10.py
@@ -129,17 +129,14 @@ class CannonField(QWidget):
         self.force_changed.emit(self._current_force)
 
     def paintEvent(self, event):
-        painter = QPainter(self)
-
-        painter.setPen(Qt.NoPen)
-        painter.setBrush(Qt.blue)
-
-        painter.translate(0, self.height())
-        painter.drawPie(QRect(-35, -35, 70, 70), 0, 90 * 16)
-        painter.rotate(-self._current_angle)
-        painter.drawRect(QRect(33, -4, 15, 8))
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(self) as painter:
+            painter.setPen(Qt.NoPen)
+            painter.setBrush(Qt.blue)
+
+            painter.translate(0, self.height())
+            painter.drawPie(QRect(-35, -35, 70, 70), 0, 90 * 16)
+            painter.rotate(-self._current_angle)
+            painter.drawRect(QRect(33, -4, 15, 8))
 
     def cannon_rect(self):
         result = QRect(0, 0, 50, 50)
diff --git a/examples/widgets/tutorials/cannon/t11.py b/examples/widgets/tutorials/cannon/t11.py
index ea8e53a8e..fa2198e10 100644
--- a/examples/widgets/tutorials/cannon/t11.py
+++ b/examples/widgets/tutorials/cannon/t11.py
@@ -159,13 +159,10 @@ class CannonField(QWidget):
         self.update(region)
 
     def paintEvent(self, event):
-        painter = QPainter(self)
-
-        self.paint_cannon(painter)
-        if self._auto_shoot_timer.isActive():
-            self.paint_shot(painter)
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(self) as painter:
+            self.paint_cannon(painter)
+            if self._auto_shoot_timer.isActive():
+                self.paint_shot(painter)
 
     def paint_shot(self, painter):
         painter.setPen(Qt.NoPen)
diff --git a/examples/widgets/tutorials/cannon/t12.py b/examples/widgets/tutorials/cannon/t12.py
index 98b2ff248..bfde8d5de 100644
--- a/examples/widgets/tutorials/cannon/t12.py
+++ b/examples/widgets/tutorials/cannon/t12.py
@@ -198,15 +198,12 @@ class CannonField(QWidget):
         self.update(region)
 
     def paintEvent(self, event):
-        painter = QPainter(self)
+        with QPainter(self) as painter:
+            self.paint_cannon(painter)
+            if self._auto_shoot_timer.isActive():
+                self.paint_shot(painter)
 
-        self.paint_cannon(painter)
-        if self._auto_shoot_timer.isActive():
-            self.paint_shot(painter)
-
-        self.paint_target(painter)
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+            self.paint_target(painter)
 
     def paint_shot(self, painter):
         painter.setPen(Qt.NoPen)
diff --git a/examples/widgets/tutorials/cannon/t13.py b/examples/widgets/tutorials/cannon/t13.py
index 3ac05f435..fe487de53 100644
--- a/examples/widgets/tutorials/cannon/t13.py
+++ b/examples/widgets/tutorials/cannon/t13.py
@@ -220,20 +220,17 @@ class CannonField(QWidget):
         self.update(region)
 
     def paintEvent(self, event):
-        painter = QPainter(self)
-
-        if self._game_ended:
-            painter.setPen(Qt.black)
-            painter.setFont(QFont("Courier", 48, QFont.Bold))
-            painter.drawText(self.rect(), Qt.AlignCenter, "Game Over")
-
-        self.paint_cannon(painter)
-        if self.is_shooting():
-            self.paint_shot(painter)
-        if not self._game_ended:
-            self.paint_target(painter)
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(self) as painter:
+            if self._game_ended:
+                painter.setPen(Qt.black)
+                painter.setFont(QFont("Courier", 48, QFont.Bold))
+                painter.drawText(self.rect(), Qt.AlignCenter, "Game Over")
+
+            self.paint_cannon(painter)
+            if self.is_shooting():
+                self.paint_shot(painter)
+            if not self._game_ended:
+                self.paint_target(painter)
 
     def paint_shot(self, painter):
         painter.setPen(Qt.NoPen)
diff --git a/examples/widgets/tutorials/cannon/t14.py b/examples/widgets/tutorials/cannon/t14.py
index 8a3fe98e8..ac6924a3b 100644
--- a/examples/widgets/tutorials/cannon/t14.py
+++ b/examples/widgets/tutorials/cannon/t14.py
@@ -243,21 +243,18 @@ class CannonField(QWidget):
             self._barrel_pressed = False
 
     def paintEvent(self, event):
-        painter = QPainter(self)
-
-        if self._game_ended:
-            painter.setPen(Qt.black)
-            painter.setFont(QFont("Courier", 48, QFont.Bold))
-            painter.drawText(self.rect(), Qt.AlignCenter, "Game Over")
-
-        self.paint_cannon(painter)
-        self.paint_barrier(painter)
-        if self.is_shooting():
-            self.paint_shot(painter)
-        if not self._game_ended:
-            self.paint_target(painter)
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(self) as painter:
+            if self._game_ended:
+                painter.setPen(Qt.black)
+                painter.setFont(QFont("Courier", 48, QFont.Bold))
+                painter.drawText(self.rect(), Qt.AlignCenter, "Game Over")
+
+            self.paint_cannon(painter)
+            self.paint_barrier(painter)
+            if self.is_shooting():
+                self.paint_shot(painter)
+            if not self._game_ended:
+                self.paint_target(painter)
 
     def paint_shot(self, painter):
         painter.setPen(Qt.NoPen)
diff --git a/examples/widgets/tutorials/cannon/t8.py b/examples/widgets/tutorials/cannon/t8.py
index b02a049cc..757015495 100644
--- a/examples/widgets/tutorials/cannon/t8.py
+++ b/examples/widgets/tutorials/cannon/t8.py
@@ -115,10 +115,8 @@ class CannonField(QWidget):
         self.angle_changed.emit(self._current_angle)
 
     def paintEvent(self, event):
-        painter = QPainter(self)
-        painter.drawText(200, 200, f"Angle = {self._current_angle}")
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(self) as painter:
+            painter.drawText(200, 200, f"Angle = {self._current_angle}")
 
 
 class MyWidget(QWidget):
diff --git a/examples/widgets/tutorials/cannon/t9.py b/examples/widgets/tutorials/cannon/t9.py
index f18144310..a682c8356 100644
--- a/examples/widgets/tutorials/cannon/t9.py
+++ b/examples/widgets/tutorials/cannon/t9.py
@@ -115,17 +115,14 @@ class CannonField(QWidget):
         self.angle_changed.emit(self._current_angle)
 
     def paintEvent(self, event):
-        painter = QPainter(self)
-
-        painter.setPen(Qt.NoPen)
-        painter.setBrush(Qt.blue)
-
-        painter.translate(0, self.rect().height())
-        painter.drawPie(QRect(-35, -35, 70, 70), 0, 90 * 16)
-        painter.rotate(-self._current_angle)
-        painter.drawRect(QRect(33, -4, 15, 8))
-        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
-        painter.end()
+        with QPainter(self) as painter:
+            painter.setPen(Qt.NoPen)
+            painter.setBrush(Qt.blue)
+
+            painter.translate(0, self.rect().height())
+            painter.drawPie(QRect(-35, -35, 70, 70), 0, 90 * 16)
+            painter.rotate(-self._current_angle)
+            painter.drawRect(QRect(33, -4, 15, 8))
 
 
 class MyWidget(QWidget):