我之前提出了一个关于如何在小部件之间画线的问题。而@eyllanesc很好地解决了这个问题。但我面临另一个问题。我尝试用QScrollarea制作小部件。但是这些线没有显示出来
当使用Widget
时,它可以很好地绘制线条,但QScrollArea似乎需要另一个paint_event
。我不知道怎么做
有人能帮我展示一下QScrollarea的台词吗
import functools
import sys
from PyQt5.QtCore import QEvent, QLine
from PyQt5.QtGui import QPainter
from PyQt5.QtWidgets import QApplication, QPushButton, QVBoxLayout, QWidget, QScrollArea
class Drawer:
def __init__(self):
self._lines = []
@property
def lines(self):
return self._lines
@lines.setter
def lines(self, l):
self._lines = l[:]
self.update()
def paintEvent(self, event):
painter = QPainter(self)
for line in self.lines:
painter.drawLine(line)
class Example(QScrollArea, Drawer):
def __init__(self, parent=None):
super().__init__(parent)
self.initUI()
def initUI(self):
self.AddButton = QPushButton("Add")
self.AddButton.clicked.connect(self.addbuttonwithline)
self.w = QWidget()
self.setWidget(self.w)
self.setWidgetResizable(True)
self.vbox = QVBoxLayout(self.w)
self.vbox.addWidget(self.AddButton)
self.setGeometry(300, 300, 300, 150)
self.setWindowTitle("Buttons")
self.buttons = []
def addbuttonwithline(self):
button = QPushButton("delete")
button.clicked.connect(functools.partial(self.remove_button, button))
button.installEventFilter(self)
self.vbox.addWidget(button)
self.buttons.append(button)
self.recalculate_position()
def remove_button(self, button):
self.buttons.remove(button)
button.deleteLater()
self.recalculate_position()
def recalculate_position(self):
lines = []
for last_button, next_button in zip(self.buttons, self.buttons[1:]):
l = QLine(last_button.pos().x()+50, last_button.pos().y(), next_button.pos().x()+50, next_button.pos().y())
lines.append(l)
self.lines = lines
def eventFilter(self, o, e):
if e.type() == QEvent.Move and o in self.buttons:
self.recalculate_position()
return super().eventFilter(o, e)
if __name__ == "__main__":
app = QApplication(sys.argv)
ex = Example()
ex.show()
sys.exit(app.exec_())
QScrollArea被设计成一个容器,因此您不应该在该项目上绘画,因为内容覆盖了它,而是在内容小部件中设置绘画
根据我从my previous answer开始的代码,只需更改为:
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