_PrivateData classes: prevent random segfaults by deriving from QObject

qwt/color_map.py

@@ -28,7 +28,7 @@
    :members:
 """
 
-from qtpy.QtCore import Qt, qIsNaN
+from qtpy.QtCore import QObject, Qt, qIsNaN
 from qtpy.QtGui import QColor, qAlpha, qBlue, qGreen, qRed, qRgb, qRgba
 
 
@@ -211,8 +211,10 @@ def colorIndex(self, interval, value):
         return 0
 
 
-class QwtLinearColorMap_PrivateData(object):
+class QwtLinearColorMap_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.colorStops = ColorStops()
         self.mode = None
 
@@ -322,8 +324,10 @@ def colorIndex(self, interval, value):
             return int(ratio * 255 + 0.5)
 
 
-class QwtAlphaColorMap_PrivateData(object):
+class QwtAlphaColorMap_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.color = QColor()
         self.rgb = QColor().rgb()
         self.rgbMax = QColor().rgb()

qwt/column_symbol.py

@@ -5,7 +5,7 @@
 # Copyright (c) 2015 Pierre Raybaut, for the Python translation/optimization
 # (see LICENSE file for more details)
 
-from qtpy.QtCore import QLineF, QRectF, Qt
+from qtpy.QtCore import QLineF, QObject, QRectF, Qt
 from qtpy.QtGui import QPalette, QPolygonF
 
 from qwt.interval import QwtInterval
@@ -71,8 +71,10 @@ def qwtDrawPanel(painter, rect, pal, lw):
     painter.fillRect(rect.adjusted(lw, lw, -lw + 1, -lw + 1), pal.window())
 
 
-class QwtColumnSymbol_PrivateData(object):
+class QwtColumnSymbol_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.style = QwtColumnSymbol.Box
         self.frameStyle = QwtColumnSymbol.Raised
         self.lineWidth = 2

qwt/dyngrid_layout.py

@@ -15,12 +15,14 @@
    :members:
 """
 
-from qtpy.QtCore import QRect, QSize, Qt
+from qtpy.QtCore import QObject, QRect, QSize, Qt
 from qtpy.QtWidgets import QLayout
 
 
-class QwtDynGridLayout_PrivateData(object):
+class QwtDynGridLayout_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.isDirty = True
         self.maxColumns = 0
         self.numRows = 0

qwt/graphic.py

@@ -15,7 +15,7 @@
 
 import math
 
-from qtpy.QtCore import QPointF, QRect, QRectF, QSize, QSizeF, Qt
+from qtpy.QtCore import QObject, QPointF, QRect, QRectF, QSize, QSizeF, Qt
 from qtpy.QtGui import (
     QImage,
     QPaintEngine,
@@ -185,8 +185,9 @@ def scaleFactorY(self, pathRect, targetRect, scalePens):
         return sy
 
 
-class QwtGraphic_PrivateData(object):
+class QwtGraphic_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
         self.boundingRect = QRectF(0.0, 0.0, -1.0, -1.0)
         self.pointRect = QRectF(0.0, 0.0, -1.0, -1.0)
         self.initialTransform = None

qwt/legend.py

@@ -21,7 +21,7 @@
 
 import math
 
-from qtpy.QtCore import QEvent, QPoint, QRect, QRectF, QSize, Qt, Signal
+from qtpy.QtCore import QEvent, QObject, QPoint, QRect, QRectF, QSize, Qt, Signal
 
 # qDrawWinButton,
 from qtpy.QtGui import QPainter, QPalette, QPixmap
@@ -170,8 +170,10 @@ def buttonShift(w):
     return QSize(ph, pv)
 
 
-class QwtLegendLabel_PrivateData(object):
+class QwtLegendLabel_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.itemMode = QwtLegendData.ReadOnly
         self.isDown = False
         self.spacing = MARGIN
@@ -588,8 +590,10 @@ def layoutContents(self):
         self.contentsWidget.resize(w, h)
 
 
-class QwtLegend_PrivateData(object):
+class QwtLegend_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.itemMode = QwtLegendData.ReadOnly
         self.view = QwtDynGridLayout()
         self.itemMap = QwtLegendMap()

qwt/null_paintdevice.py

@@ -15,13 +15,16 @@
 
 import os
 
+from qtpy.QtCore import QObject
 from qtpy.QtGui import QPaintDevice, QPaintEngine, QPainterPath
 
 QT_API = os.environ["QT_API"]
 
 
-class QwtNullPaintDevice_PrivateData(object):
+class QwtNullPaintDevice_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.mode = QwtNullPaintDevice.NormalMode
 
 

qwt/plot.py

@@ -22,7 +22,7 @@
 import math
 
 import numpy as np
-from qtpy.QtCore import QEvent, QRectF, QSize, Qt, Signal
+from qtpy.QtCore import QEvent, QObject, QRectF, QSize, Qt, Signal
 from qtpy.QtGui import QBrush, QColor, QFont, QPainter, QPalette
 from qtpy.QtWidgets import QApplication, QFrame, QSizePolicy, QWidget
 
@@ -75,9 +75,10 @@ def removeItem(self, obj):
         self.sortItems()
 
 
-class QwtPlot_PrivateData(object):
+class QwtPlot_PrivateData(QObject):
     def __init__(self):
-        super(QwtPlot_PrivateData, self).__init__()
+        QObject.__init__(self)
+
         self.itemList = ItemList()
         self.titleLabel = None
         self.footerLabel = None
@@ -1691,8 +1692,10 @@ def exportTo(
         renderer.renderDocument(self, filename, size_mm, resolution, format_)
 
 
-class QwtPlotItem_PrivateData(object):
+class QwtPlotItem_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.plot = None
         self.isVisible = True
         self.attributes = 0

qwt/plot_canvas.py

@@ -15,7 +15,7 @@
 
 import os
 
-from qtpy.QtCore import QEvent, QPoint, QPointF, QRect, QRectF, QSize, Qt
+from qtpy.QtCore import QEvent, QObject, QPoint, QPointF, QRect, QRectF, QSize, Qt
 from qtpy.QtGui import (
     QBrush,
     QGradient,
@@ -329,8 +329,10 @@ def __init__(self):
         self.background = StyleSheetBackground()
 
 
-class QwtPlotCanvas_PrivateData(object):
+class QwtPlotCanvas_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.focusIndicator = QwtPlotCanvas.NoFocusIndicator
         self.borderRadius = 0
         self.paintAttributes = 0

qwt/plot_directpainter.py

@@ -39,8 +39,10 @@ def qwtHasBackingStore(canvas):
     )
 
 
-class QwtPlotDirectPainter_PrivateData(object):
+class QwtPlotDirectPainter_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.attributes = 0
         self.hasClipping = False
         self.seriesItem = None  # QwtPlotSeriesItem

qwt/plot_grid.py

@@ -13,7 +13,7 @@
    :members:
 """
 
-from qtpy.QtCore import QLineF, Qt
+from qtpy.QtCore import QLineF, QObject, Qt
 from qtpy.QtGui import QPen
 
 from qwt._math import qwtFuzzyGreaterOrEqual, qwtFuzzyLessOrEqual
@@ -22,8 +22,10 @@
 from qwt.scale_div import QwtScaleDiv
 
 
-class QwtPlotGrid_PrivateData(object):
+class QwtPlotGrid_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.xEnabled = True
         self.yEnabled = True
         self.xMinEnabled = False

qwt/plot_layout.py

@@ -15,7 +15,7 @@
 
 import math
 
-from qtpy.QtCore import QRectF, QSize, Qt
+from qtpy.QtCore import QObject, QRectF, QSize, Qt
 from qtpy.QtGui import QFont, QRegion
 
 from qwt.plot import QwtPlot
@@ -143,8 +143,10 @@ def init(self, plot, rect):
             ]
 
 
-class QwtPlotLayout_PrivateData(object):
+class QwtPlotLayout_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.spacing = 5
         self.titleRect = QRectF()
         self.footerRect = QRectF()

qwt/plot_marker.py

@@ -13,7 +13,7 @@
    :members:
 """
 
-from qtpy.QtCore import QLineF, QPointF, QRect, QRectF, QSizeF, Qt
+from qtpy.QtCore import QLineF, QObject, QPointF, QRect, QRectF, QSizeF, Qt
 from qtpy.QtGui import QPainter, QPen
 
 from qwt.graphic import QwtGraphic
@@ -23,8 +23,10 @@
 from qwt.text import QwtText
 
 
-class QwtPlotMarker_PrivateData(object):
+class QwtPlotMarker_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.labelAlignment = Qt.AlignCenter
         self.labelOrientation = Qt.Horizontal
         self.spacing = 2

qwt/plot_renderer.py

@@ -55,8 +55,10 @@ def qwtCanvasClip(canvas, canvasRect):
     return canvas.borderPath(r)
 
 
-class QwtPlotRenderer_PrivateData(object):
+class QwtPlotRenderer_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.discardFlags = QwtPlotRenderer.DiscardNone
         self.layoutFlags = QwtPlotRenderer.DefaultLayout
 

qwt/scale_draw.py

@@ -21,7 +21,16 @@
 
 import math
 
-from qtpy.QtCore import QLineF, QPoint, QPointF, QRect, QRectF, Qt, qFuzzyCompare
+from qtpy.QtCore import (
+    QLineF,
+    QObject,
+    QPoint,
+    QPointF,
+    QRect,
+    QRectF,
+    Qt,
+    qFuzzyCompare,
+)
 from qtpy.QtGui import QFontMetrics, QPalette, QTransform
 
 from qwt._math import qwtRadians
@@ -30,8 +39,10 @@
 from qwt.text import QwtText
 
 
-class QwtAbstractScaleDraw_PrivateData(object):
+class QwtAbstractScaleDraw_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.spacing = 4
         self.penWidth = 0
         self.minExtent = 0.0
@@ -233,7 +244,8 @@ def draw(self, painter, palette):
         Draw the scale
 
         :param QPainter painter: The painter
-        :param QPalette palette: Palette, text color is used for the labels, foreground color for ticks and backbone
+        :param QPalette palette: Palette, text color is used for the labels,
+         foreground color for ticks and backbone
         """
         painter.save()
 
@@ -457,8 +469,10 @@ def invalidateCache(self):
         self.__data.labelCache.clear()
 
 
-class QwtScaleDraw_PrivateData(object):
+class QwtScaleDraw_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.len = 0
         self.alignment = QwtScaleDraw.BottomScale
         self.labelAlignment = 0
@@ -1048,7 +1062,8 @@ def setLabelRotation(self, rotation):
         adjust the label flags too. Finding a useful combination is
         often the result of try and error.
 
-        :param float rotation: Angle in degrees. When changing the label rotation, the label flags often needs to be adjusted too.
+        :param float rotation: Angle in degrees. When changing the label rotation, the
+         label flags often needs to be adjusted too.
 
         .. seealso::
 

qwt/scale_widget.py

@@ -15,7 +15,7 @@
 
 import math
 
-from qtpy.QtCore import QRectF, QSize, Qt, Signal
+from qtpy.QtCore import QObject, QRectF, QSize, Qt, Signal
 from qtpy.QtGui import QPainter, QPalette
 from qtpy.QtWidgets import QSizePolicy, QStyle, QStyleOption, QWidget
 
@@ -35,8 +35,10 @@ def __init__(self):
         self.colorMap = QwtColorMap()
 
 
-class QwtScaleWidget_PrivateData(object):
+class QwtScaleWidget_PrivateData(QObject):
     def __init__(self):
+        QObject.__init__(self)
+
         self.scaleDraw = None
         self.borderDist = [None] * 2
         self.minBorderDist = [None] * 2

qwt/symbol.py

@@ -15,7 +15,17 @@
 
 import math
 
-from qtpy.QtCore import QLineF, QPoint, QPointF, QRect, QRectF, QSize, QSizeF, Qt
+from qtpy.QtCore import (
+    QLineF,
+    QObject,
+    QPoint,
+    QPointF,
+    QRect,
+    QRectF,
+    QSize,
+    QSizeF,
+    Qt,
+)
 from qtpy.QtGui import (
     QBrush,
     QPainter,
@@ -334,8 +344,9 @@ def qwtDrawHexagonSymbols(painter, points, symbol):
         painter.drawPolygon(QPolygonF(hexa))
 
 
-class QwtSymbol_PrivateData(object):
+class QwtSymbol_PrivateData(QObject):
     def __init__(self, st, br, pn, sz):
+        QObject.__init__(self)
         self.style = st
         self.size = sz
         self.brush = br