Source code for pyqtgraph.graphicsItems.LabelItem

from .. import functions as fn
from .. import getConfigOption
from ..Qt import QtCore, QtWidgets, QtGui
from .GraphicsWidget import GraphicsWidget
from .GraphicsWidgetAnchor import GraphicsWidgetAnchor

__all__ = ['LabelItem']

[docs]class LabelItem(GraphicsWidget, GraphicsWidgetAnchor): """ GraphicsWidget displaying text. Used mainly as axis labels, titles, etc. Note: To display text inside a scaled view (ViewBox, PlotWidget, etc) use TextItem """
[docs] def __init__(self, text=' ', parent=None, angle=0, **args): GraphicsWidget.__init__(self, parent) GraphicsWidgetAnchor.__init__(self) self.item = QtWidgets.QGraphicsTextItem(self) self.opts = { 'color': None, 'justify': 'center' } self.opts.update(args) self._sizeHint = {} self.setText(text) self.setAngle(angle)
[docs] def setAttr(self, attr, value): """Set default text properties. See setText() for accepted parameters.""" self.opts[attr] = value
[docs] def setText(self, text, **args): """Set the text and text properties in the label. Accepts optional arguments for auto-generating a CSS style string: ==================== ============================== **Style Arguments:** color (str) example: '#CCFF00' size (str) example: '8pt' bold (bool) italic (bool) ==================== ============================== """ self.text = text opts = self.opts for k in args: opts[k] = args[k] optlist = [] color = self.opts['color'] if color is None: color = getConfigOption('foreground') color = fn.mkColor(color) optlist.append('color: ' + color.name(QtGui.QColor.NameFormat.HexArgb)) if 'size' in opts: optlist.append('font-size: ' + opts['size']) if 'bold' in opts and opts['bold'] in [True, False]: optlist.append('font-weight: ' + {True:'bold', False:'normal'}[opts['bold']]) if 'italic' in opts and opts['italic'] in [True, False]: optlist.append('font-style: ' + {True:'italic', False:'normal'}[opts['italic']]) full = "<span style='%s'>%s</span>" % ('; '.join(optlist), text) #print full self.item.setHtml(full) self.updateMin() self.resizeEvent(None) self.updateGeometry()
def resizeEvent(self, ev): #c1 = self.boundingRect().center() #c2 = self.item.mapToParent(self.item.boundingRect().center()) # + self.item.pos() #dif = c1 - c2 #self.item.moveBy(dif.x(), dif.y()) #print c1, c2, dif, self.item.pos() self.item.setPos(0,0) bounds = self.itemRect() left = self.mapFromItem(self.item, QtCore.QPointF(0,0)) - self.mapFromItem(self.item, QtCore.QPointF(1,0)) rect = self.rect() if self.opts['justify'] == 'left': if left.x() != 0: bounds.moveLeft(rect.left()) if left.y() < 0: bounds.moveTop(rect.top()) elif left.y() > 0: bounds.moveBottom(rect.bottom()) elif self.opts['justify'] == 'center': bounds.moveCenter(rect.center()) #bounds = self.itemRect() #self.item.setPos(self.width()/2. - bounds.width()/2., 0) elif self.opts['justify'] == 'right': if left.x() != 0: bounds.moveRight(rect.right()) if left.y() < 0: bounds.moveBottom(rect.bottom()) elif left.y() > 0: bounds.moveTop(rect.top()) #bounds = self.itemRect() #self.item.setPos(self.width() - bounds.width(), 0) self.item.setPos(bounds.topLeft() - self.itemRect().topLeft()) self.updateMin() def setAngle(self, angle): self.angle = angle self.item.resetTransform() self.item.setRotation(angle) self.updateMin() def updateMin(self): bounds = self.itemRect() self.setMinimumWidth(bounds.width()) self.setMinimumHeight(bounds.height()) self._sizeHint = { QtCore.Qt.SizeHint.MinimumSize: (bounds.width(), bounds.height()), QtCore.Qt.SizeHint.PreferredSize: (bounds.width(), bounds.height()), QtCore.Qt.SizeHint.MaximumSize: (-1, -1), #bounds.width()*2, bounds.height()*2), QtCore.Qt.SizeHint.MinimumDescent: (0, 0) ##?? what is this? } self.updateGeometry() def sizeHint(self, hint, constraint): if hint not in self._sizeHint: return QtCore.QSizeF(0, 0) return QtCore.QSizeF(*self._sizeHint[hint]) def itemRect(self): return self.item.mapRectToParent(self.item.boundingRect())
#def paint(self, p, *args): #p.setPen(fn.mkPen('r')) #p.drawRect(self.rect()) #p.setPen(fn.mkPen('g')) #p.drawRect(self.itemRect())