【发布时间】：2020-12-29 14:18:45
【问题描述】：
我创建了一个自定义 QGraphicsWidget，它能够在场景中调整小部件的大小。我还可以将预定义的小部件（例如按钮、标签等）添加到我的自定义小部件中。我现在有两个问题。
第一个是在插入新的label 或LineEdit 小部件时，小部件不会更改大小（重新调整），因为新插入的小部件不会出现在自定义小部件边框之外。
当我尝试将QGraphicsLayout 的setContentMargins 更改为0 以外的值时遇到第二个问题。例如QGraphicsLayout.setContentMargins(1, 1, 1, 20) 将延迟LineEdit 小部件中的光标。
这是图片。
（拖动灰色三角形改变大小）
import sys
from PyQt5 import QtWidgets, QtCore, QtGui, Qt
from PyQt5.QtCore import Qt, QRectF, QPointF
from PyQt5.QtGui import QBrush, QPainterPath, QPainter, QColor, QPen, QPixmap
from PyQt5.QtWidgets import QGraphicsRectItem, QApplication, QGraphicsView, QGraphicsScene, QGraphicsItem
class Container(QtWidgets.QWidget):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.layout = QtWidgets.QVBoxLayout(self)
self.layout.setContentsMargins(0, 0, 0, 0)
self.layout.setSpacing(0)
self.setStyleSheet('Container{background:transparent;}')
class GraphicsFrame(QtWidgets.QGraphicsWidget):
def __init__(self, *args, **kwargs):
super(GraphicsFrame, self).__init__()
x, y, h, w = args
rect = QRectF(x, y, h, w)
self.setGeometry(rect)
self.setMinimumSize(150, 150)
self.setMaximumSize(400, 800)
self.setAcceptHoverEvents(True)
self.setFlag(QGraphicsItem.ItemIsMovable, True)
self.setFlag(QGraphicsItem.ItemIsSelectable, True)
self.setFlag(QGraphicsItem.ItemSendsGeometryChanges, True)
self.setFlag(QGraphicsItem.ItemIsFocusable, True)
self.mousePressPos = None
self.mousePressRect = None
self.handleSelected = None
self.polygon = QtGui.QPolygon([
QtCore.QPoint(int(self.rect().width()-10), int(self.rect().height()-20)),
QtCore.QPoint(int(self.rect().width()-10), int(self.rect().height()-10)),
QtCore.QPoint(int(self.rect().width()-20), int(self.rect().height()-10))
])
graphic_layout = QtWidgets.QGraphicsLinearLayout(Qt.Vertical, self)
graphic_layout.setContentsMargins(0, 0, 0, 20) # changing this will cause the second problem
self.container = Container()
proxyWidget = QtWidgets.QGraphicsProxyWidget(self)
proxyWidget.setWidget(self.container)
graphic_layout.addItem(proxyWidget)
self.contentLayout = QtWidgets.QFormLayout()
self.contentLayout.setContentsMargins(10, 10, 20, 20)
self.contentLayout.setSpacing(5)
self.container.layout.addLayout(self.contentLayout)
self.options = []
def addOption(self, color=Qt.white, lbl=None, widget=None):
self.insertOption(-1, lbl, widget, color)
def insertOption(self, index, lbl, widget, color=Qt.white):
if index < 0:
index = self.contentLayout.count()
self.contentLayout.addRow(lbl, widget)
self.options.insert(index, (widget, color))
def update_polygon(self):
self.polygon = QtGui.QPolygon([
QtCore.QPoint(int(self.rect().width() - 10), int(self.rect().height() - 20)),
QtCore.QPoint(int(self.rect().width() - 10), int(self.rect().height() - 10)),
QtCore.QPoint(int(self.rect().width() - 20), int(self.rect().height() - 10))
])
def hoverMoveEvent(self, event):
if self.polygon.containsPoint(event.pos().toPoint(), Qt.OddEvenFill):
self.setCursor(Qt.SizeFDiagCursor)
else:
self.unsetCursor()
super(GraphicsFrame, self).hoverMoveEvent(event)
def mousePressEvent(self, event):
self.handleSelected = self.polygon.containsPoint(event.pos().toPoint(), Qt.OddEvenFill)
if self.handleSelected:
self.mousePressPos = event.pos()
self.mousePressRect = self.boundingRect()
super(GraphicsFrame, self).mousePressEvent(event)
def mouseMoveEvent(self, event):
if self.handleSelected:
self.Resize(event.pos())
else:
super(GraphicsFrame, self).mouseMoveEvent(event)
def mouseReleaseEvent(self, event):
super(GraphicsFrame, self).mouseReleaseEvent(event)
self.handleSelected = False
self.mousePressPos = None
self.mousePressRect = None
self.update()
def paint(self, painter, option, widget):
painter.save()
painter.setBrush(QBrush(QColor(37, 181, 247)))
pen = QPen(Qt.white)
pen.setWidth(2)
if self.isSelected():
pen.setColor(Qt.yellow)
painter.setPen(pen)
painter.drawRoundedRect(self.rect(), 4, 4)
painter.setPen(QtCore.Qt.white)
painter.setBrush(QtCore.Qt.gray)
painter.drawPolygon(self.polygon)
super().paint(painter, option, widget)
painter.restore()
def Resize(self, mousePos):
"""
Perform shape interactive resize.
"""
if self.handleSelected:
self.prepareGeometryChange()
width, height = self.geometry().width()+(mousePos.x()-self.mousePressPos.x()),\
self.geometry().height()+(mousePos.y()-self.mousePressPos.y())
self.setGeometry(QRectF(self.geometry().x(), self.geometry().y(), width, height))
self.contentLayout.setGeometry(QtCore.QRect(0, 30, width-10, height-20))
self.mousePressPos = mousePos
self.update_polygon()
self.updateGeometry()
def main():
app = QApplication(sys.argv)
grview = QGraphicsView()
scene = QGraphicsScene()
grview.setViewportUpdateMode(grview.FullViewportUpdate)
scene.addPixmap(QPixmap('01.png'))
grview.setScene(scene)
item = GraphicsFrame(0, 0, 300, 150)
scene.addItem(item)
item.addOption(Qt.green, lbl=QtWidgets.QLabel('I am a label'), widget=QtWidgets.QLineEdit())
item.addOption(lbl=QtWidgets.QLabel('why'), widget=QtWidgets.QLineEdit())
item.addOption(lbl=QtWidgets.QLabel('How'), widget=QtWidgets.QLineEdit())
item.addOption(lbl=QtWidgets.QLabel('Nooo.'), widget=QtWidgets.QLineEdit())
item.addOption(lbl=QtWidgets.QLabel('Nooo.'), widget=QtWidgets.QLineEdit())
item.addOption(lbl=QtWidgets.QLabel('Nooo.'), widget=QtWidgets.QLineEdit())
item2 = GraphicsFrame(50, 50, 300, 150)
scene.addItem(item2)
grview.fitInView(scene.sceneRect(), Qt.KeepAspectRatio)
grview.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
【问题讨论】：
标签： python pyqt pyqt5 qgraphicswidget