Python QGraphicsTextItem.document方法代码示例

# 需要导入模块: from AnyQt.QtWidgets import QGraphicsTextItem [as 别名]
# 或者: from AnyQt.QtWidgets.QGraphicsTextItem import document [as 别名]
class GraphicsTextWidget(QGraphicsWidget):
    def __init__(self, text, parent=None, **kwargs):
        super().__init__(parent, **kwargs)
        self.labelItem = QGraphicsTextItem(self)
        self.setHtml(text)

        self.labelItem.document().documentLayout().documentSizeChanged.connect(
            self.onLayoutChanged
        )

    def setGeometry(self, rect):
        self.prepareGeometryChange()
        super().setGeometry(rect)

    def onLayoutChanged(self, *args):
        self.updateGeometry()

    def sizeHint(self, which, constraint=QSizeF()):
        if which == Qt.MinimumSize:
            return self.labelItem.boundingRect().size()
        else:
            return self.labelItem.boundingRect().size()

    def setTextWidth(self, width):
        self.labelItem.setTextWidth(width)

    def setHtml(self, text):
        self.labelItem.setHtml(text)

# 需要导入模块: from AnyQt.QtWidgets import QGraphicsTextItem [as 别名]
# 或者: from AnyQt.QtWidgets.QGraphicsTextItem import document [as 别名]
class VennIntersectionArea(QGraphicsPathItem):
    def __init__(self, parent=None, text=""):
        super(QGraphicsPathItem, self).__init__(parent)
        self.setAcceptHoverEvents(True)
        self.setPen(QPen(Qt.NoPen))

        self.text = QGraphicsTextItem(self)
        layout = self.text.document().documentLayout()
        layout.documentSizeChanged.connect(self._onLayoutChanged)

        self._text = ""
        self._anchor = QPointF()

    def setText(self, text):
        if self._text != text:
            self._text = text
            self.text.setPlainText(text)

    def text(self):
        return self._text

    def setTextAnchor(self, pos):
        if self._anchor != pos:
            self._anchor = pos
            self._updateTextAnchor()

    def hoverEnterEvent(self, event):
        self.setZValue(self.zValue() + 1)
        return QGraphicsPathItem.hoverEnterEvent(self, event)

    def hoverLeaveEvent(self, event):
        self.setZValue(self.zValue() - 1)
        return QGraphicsPathItem.hoverLeaveEvent(self, event)

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            if event.modifiers() & Qt.AltModifier:
                self.setSelected(False)
            elif event.modifiers() & Qt.ControlModifier:
                self.setSelected(not self.isSelected())
            elif event.modifiers() & Qt.ShiftModifier:
                self.setSelected(True)
            else:
                for area in self.parentWidget().vennareas():
                    area.setSelected(False)
                self.setSelected(True)

    def mouseReleaseEvent(self, event):
        pass

    def paint(self, painter, option, widget=None):
        painter.save()
        path = self.path()
        brush = QBrush(self.brush())
        pen = QPen(self.pen())

        if option.state & QStyle.State_Selected:
            pen.setColor(Qt.red)
            brush.setStyle(Qt.DiagCrossPattern)
            brush.setColor(QColor(40, 40, 40, 100))

        elif option.state & QStyle.State_MouseOver:
            pen.setColor(Qt.blue)

        if option.state & QStyle.State_MouseOver:
            brush.setColor(QColor(100, 100, 100, 100))
            if brush.style() == Qt.NoBrush:
                # Make sure the highlight is actually visible.
                brush.setStyle(Qt.SolidPattern)

        painter.setPen(pen)
        painter.setBrush(brush)
        painter.drawPath(path)
        painter.restore()

    def itemChange(self, change, value):
        if change == QGraphicsPathItem.ItemSelectedHasChanged:
            self.setZValue(self.zValue() + (1 if value else -1))
        return QGraphicsPathItem.itemChange(self, change, value)

    def _updateTextAnchor(self):
        rect = self.text.boundingRect()
        pos = anchor_rect(rect, self._anchor)
        self.text.setPos(pos)

    def _onLayoutChanged(self):
        self._updateTextAnchor()

# 需要导入模块: from AnyQt.QtWidgets import QGraphicsTextItem [as 别名]
# 或者: from AnyQt.QtWidgets.QGraphicsTextItem import document [as 别名]

#.........这里部分代码省略.........
            self.setHoverState(False)
            self.curveItem.setPath(QPainterPath())

    def __updateText(self):
        self.prepareGeometryChange()
        self.__boundingRect = None

        if self.__sourceName or self.__sinkName:
            if self.__sourceName != self.__sinkName:
                text = ("<nobr>{0}</nobr> \u2192 <nobr>{1}</nobr>"
                        .format(escape(self.__sourceName),
                                escape(self.__sinkName)))
            else:
                # If the names are the same show only one.
                # Is this right? If the sink has two input channels of the
                # same type having the name on the link help elucidate
                # the scheme.
                text = escape(self.__sourceName)
        else:
            text = ""

        self.linkTextItem.setHtml('<div align="center">{0}</div>'
                                  .format(text))
        path = self.curveItem.curvePath()

        # Constrain the text width if it is too long to fit on a single line
        # between the two ends
        if not path.isEmpty():
            # Use the distance between the start/end points as a measure of
            # available space
            diff = path.pointAtPercent(0.0) - path.pointAtPercent(1.0)
            available_width = math.sqrt(diff.x() ** 2 + diff.y() ** 2)
            # Get the ideal text width if it was unconstrained
            doc = self.linkTextItem.document().clone(self)
            doc.setTextWidth(-1)
            idealwidth = doc.idealWidth()
            doc.deleteLater()

            # Constrain the text width but not below a certain min width
            minwidth = 100
            textwidth = max(minwidth, min(available_width, idealwidth))
            self.linkTextItem.setTextWidth(textwidth)
        else:
            # Reset the fixed width
            self.linkTextItem.setTextWidth(-1)

        if not path.isEmpty():
            center = path.pointAtPercent(0.5)
            angle = path.angleAtPercent(0.5)

            brect = self.linkTextItem.boundingRect()

            transform = QTransform()
            transform.translate(center.x(), center.y())
            transform.rotate(-angle)

            # Center and move above the curve path.
            transform.translate(-brect.width() / 2, -brect.height())

            self.linkTextItem.setTransform(transform)

    def removeLink(self):
        self.setSinkItem(None)
        self.setSourceItem(None)
        self.__updateCurve()