def __init__(self):
super().__init__()
self.order_list = [str(i) * 2 * i for i in range(20)]
self.space = 18
self.init_ui()
def init_ui(self):
self.setGeometry(300, 300, 300, 300)
self.layout = Qw.QGridLayout(self)
self.menu = Qw.QWidget()
self.menu.setFixedHeight(self.space * len(self.order_list) + 5)
self.menu.items = []
for n, i in enumerate(self.order_list):
btn = Qw.QCheckBox(i, self.menu)
btn.move(5, self.space * n + 5)
btn.setFixedHeight(15)
self.menu.items.append(btn)
self.menu_scroll = Qw.QScrollArea()
self.menu_scroll.setWidgetResizable(True)
self.menu_scroll.setWidget(self.menu)
self.layout.addWidget(self.menu_scroll, 0, 0, 1, 1)
self.layout.setColumnStretch(0, 10)
self.rec = Qw.QWidget()
self.rec_box = Qw.QVBoxLayout(self.rec)
self.rec.setLayout(self.rec_box)
self.rec_scroll = Qw.QScrollArea()
self.rec_scroll.setWidget(self.rec)
self.layout.addWidget(self.rec_scroll, 0, 1, 1, 1)
self.layout.setColumnStretch(1, 9)
self.order_btn = Qw.QPushButton('Order')
self.order_btn.setFixedSize(80, 30)
self.order_btn.clicked.connect(self.get_ordered)
self.layout.addWidget(self.order_btn, 1, 0, 1, 2, alignment=Qc.Qt.AlignCenter)
所以我有这段代码。它由带有两个QScrollAreas和一个按钮的网格布局组成。我需要将self.menu的大小设置为固定，以便可以在不足够大的时候一直滚动它。垂直已经做到了，但是如何将菜单调整为最大的小部件尺寸呢？ 将WidgetResizeable设置为False只会使ScrollArea为空。 （不要看着右边的区域，当左边的区域会被小心处理时，我会更改它）
我还应该提到，需要在单击order_btn时添加一些小部件。 那就是Layouts的代码如何工作，但是却破坏了间距和位置。
def __init__(self):
super().__init__()
self.order_list = [str(i) * 2 * i for i in range(20)]
self.space = 10
self.init_ui()
def init_ui(self):
self.setGeometry(300, 300, 300, 300)
self.layout = Qw.QGridLayout(self)
self.menu = Qw.QWidget()
lay = Qw.QVBoxLayout(self.menu)
self.menu.items = []
for n, i in enumerate(self.order_list):
btn = Qw.QCheckBox(i)
btn.setFixedHeight(15)
lay.addWidget(btn)
self.menu.items.append(btn)
self.menu_scroll = Qw.QScrollArea(widgetResizable=True)
self.menu_scroll.setWidget(self.menu)
self.layout.addWidget(self.menu_scroll, 0, 0, 1, 1)
self.layout.setColumnStretch(0, 10)
self.rec = Qw.QWidget()
self.rec.items = []
self.lay2 = Qw.QVBoxLayout(self.rec)
for n, i in enumerate(self.order_list):
btn = Qw.QCheckBox(i)
btn.setFixedHeight(15)
self.lay2.addWidget(btn)
self.rec.items.append(btn)
self.rec_scroll = Qw.QScrollArea(widgetResizable=True)
self.rec_scroll.setWidget(self.rec)
self.layout.addWidget(self.rec_scroll, 0, 0, 1, 1)
self.layout.setColumnStretch(0, 10)
self.layout.addWidget(self.rec_scroll, 0, 1, 1, 1)
self.layout.setColumnStretch(1, 9)
self.order_btn = Qw.QPushButton('Order')
self.order_btn.setFixedSize(80, 30)
self.order_btn.clicked.connect(self.get_ordered)
self.layout.addWidget(self.order_btn, 1, 0, 1, 2, alignment=Qc.Qt.AlignCenter)
@Qc.pyqtSlot()
def get_ordered(self):
try:
while self.rec.items:
self.rec.items.pop(-1).deleteLater()
n = 0
for i in self.menu.items:
if i.checkState():
item = Qw.QLabel()
item.setFixedHeight(15)
item.setText(i.text())
item.show()
self.rec.items.append(item)
self.lay2.addWidget(item)
n += 1
except Exception as error:
print(error)
答案 0 :(得分：1)
您无需计算任何内容，并且如果添加了项，是否要重新计算？您应该做的是使用QVBoxLayout计算正确的大小：
from PyQt5 import QtCore as Qc
from PyQt5 import QtWidgets as Qw
class Widget(Qw.QWidget):
def __init__(self):
super().__init__()
self.order_list = [str(i) * 2 * i for i in range(20)]
self.init_ui()
def init_ui(self):
self.setGeometry(300, 300, 300, 300)
layout = Qw.QGridLayout(self)
self.menu = Qw.QWidget()
lay = Qw.QVBoxLayout(self.menu)
self.menu.items = []
for n, i in enumerate(self.order_list):
btn = Qw.QCheckBox(i)
btn.setFixedHeight(15)
lay.addWidget(btn)
self.menu.items.append(btn)
lay.addStretch()
self.menu_scroll = Qw.QScrollArea(widgetResizable=True)
self.menu_scroll.setWidget(self.menu)
layout.addWidget(self.menu_scroll, 0, 0, 1, 1)
layout.setColumnStretch(0, 10)
self.rec = Qw.QWidget()
self.rec_box = Qw.QVBoxLayout(self.rec)
self.rec_scroll = Qw.QScrollArea()
self.rec_scroll.setWidget(self.rec)
layout.addWidget(self.rec_scroll, 0, 1, 1, 1)
layout.setColumnStretch(1, 9)
self.order_btn = Qw.QPushButton('Order')
self.order_btn.setFixedSize(80, 30)
self.order_btn.clicked.connect(self.get_ordered)
layout.addWidget(self.order_btn, 1, 0, 1, 2, alignment=Qc.Qt.AlignCenter)
@Qc.pyqtSlot()
def get_ordered(self):
pass
if __name__ == '__main__':
import sys
app = Qw.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())
从布局中删除元素总是一个坏主意，最好在必要时隐藏或显示。
from PyQt5 import QtCore as Qc
from PyQt5 import QtWidgets as Qw
class Widget(Qw.QWidget):
def __init__(self):
super().__init__()
self.order_list = [str(i) * 2 * i for i in range(20)]
self.init_ui()
def init_ui(self):
self.setGeometry(300, 300, 300, 300)
self.layout = Qw.QGridLayout(self)
self.menu = Qw.QWidget()
lay = Qw.QVBoxLayout(self.menu)
self.menu.items = []
for n, i in enumerate(self.order_list):
btn = Qw.QCheckBox(i)
btn.setFixedHeight(15)
lay.addWidget(btn)
self.menu.items.append(btn)
lay.addStretch()
self.menu_scroll = Qw.QScrollArea(widgetResizable=True)
self.menu_scroll.setWidget(self.menu)
self.layout.addWidget(self.menu_scroll, 0, 0, 1, 1)
self.layout.setColumnStretch(0, 10)
self.rec = Qw.QWidget()
self.rec.items = []
lay2 = Qw.QVBoxLayout(self.rec)
for n, i in enumerate(self.order_list):
btn = Qw.QLabel(i)
btn.setFixedHeight(15)
lay2.addWidget(btn)
self.rec.items.append(btn)
lay2.addStretch()
self.rec_scroll = Qw.QScrollArea(widgetResizable=True)
self.rec_scroll.setWidget(self.rec)
self.layout.addWidget(self.rec_scroll, 0, 0, 1, 1)
self.layout.setColumnStretch(0, 10)
self.layout.addWidget(self.rec_scroll, 0, 1, 1, 1)
self.layout.setColumnStretch(1, 9)
self.order_btn = Qw.QPushButton('Order')
self.order_btn.setFixedSize(80, 30)
self.order_btn.clicked.connect(self.get_ordered)
self.layout.addWidget(self.order_btn, 1, 0, 1, 2, alignment=Qc.Qt.AlignCenter)
@Qc.pyqtSlot()
def get_ordered(self):
for checkbox, label in zip(self.menu.items, self.rec.items):
label.setVisible(checkbox.isChecked())
if __name__ == '__main__':
import sys
app = Qw.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())