Source code for pyqtgraph.widgets.GradientWidget

# -*- coding: utf-8 -*-
from ..Qt import QtGui, QtCore, QtWidgets
from .GraphicsView import GraphicsView
from ..graphicsItems.GradientEditorItem import GradientEditorItem

__all__ = ['GradientWidget']


[docs]class GradientWidget(GraphicsView): """ Widget displaying an editable color gradient. The user may add, move, recolor, or remove colors from the gradient. Additionally, a context menu allows the user to select from pre-defined gradients. """ sigGradientChanged = QtCore.Signal(object) sigGradientChangeFinished = QtCore.Signal(object)
[docs] def __init__(self, parent=None, orientation='bottom', *args, **kargs): """ The *orientation* argument may be 'bottom', 'top', 'left', or 'right' indicating whether the gradient is displayed horizontally (top, bottom) or vertically (left, right) and on what side of the gradient the editable ticks will appear. All other arguments are passed to :func:`GradientEditorItem.__init__ <pyqtgraph.GradientEditorItem.__init__>`. Note: For convenience, this class wraps methods from :class:`GradientEditorItem <pyqtgraph.GradientEditorItem>`. """ GraphicsView.__init__(self, parent, useOpenGL=False, background=None) self.maxDim = 31 kargs['tickPen'] = 'k' self.item = GradientEditorItem(*args, **kargs) self.item.sigGradientChanged.connect(self.sigGradientChanged) self.item.sigGradientChangeFinished.connect(self.sigGradientChangeFinished) self.setCentralItem(self.item) self.setOrientation(orientation) self.setCacheMode(self.CacheModeFlag.CacheNone) self.setRenderHints(QtGui.QPainter.RenderHint.Antialiasing | QtGui.QPainter.RenderHint.TextAntialiasing) frame_style = QtWidgets.QFrame.Shape.NoFrame | QtWidgets.QFrame.Shadow.Plain self.setFrameStyle(frame_style)
#self.setBackgroundRole(QtGui.QPalette.ColorRole.NoRole) #self.setBackgroundBrush(QtGui.QBrush(QtCore.Qt.BrushStyle.NoBrush)) #self.setAutoFillBackground(False) #self.setAttribute(QtCore.Qt.WindowType.WindowType.WidgetAttribute.WA_PaintOnScreen, False) #self.setAttribute(QtCore.Qt.WindowType.WindowType.WidgetAttribute.WA_OpaquePaintEvent, True)
[docs] def setOrientation(self, ort): """Set the orientation of the widget. May be one of 'bottom', 'top', 'left', or 'right'.""" self.item.setOrientation(ort) self.orientation = ort self.setMaxDim()
def setMaxDim(self, mx=None): if mx is None: mx = self.maxDim else: self.maxDim = mx if self.orientation in ['bottom', 'top']: self.setFixedHeight(mx) self.setMaximumWidth(16777215) else: self.setFixedWidth(mx) self.setMaximumHeight(16777215) def __getattr__(self, attr): ### wrap methods from GradientEditorItem return getattr(self.item, attr) def widgetGroupInterface(self): return (self.sigGradientChanged, self.saveState, self.restoreState)