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pythonpyqtpyqt5qlistwidget

QListWidget display more items

Here is a picture of my GUI:

enter image description here

I want to display all 100 items in my list widget without an inner scroll bar (there is an outer scroll bar, so there is no issue that I cannot fit all the items).

I have tried disabling the scroll bar for the list widget, but that didn't increase the number of items the list widget was displaying.

Here is my code:

from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
import sys

if __name__ == "__main__":
    app = QApplication(sys.argv)

    dlg = QDialog()

    listWidget = QListWidget()
    for i in range(100):
        listWidget.addItem(QListWidgetItem("Item " + str(i)))

    layout1 = QVBoxLayout()
    layout1.addWidget(QLabel("Label 1"))
    groupBox1 = QGroupBox("Group 1")
    groupBox1.setLayout(layout1)

    layout2 = QVBoxLayout()
    layout2.addWidget(listWidget)
    groupBox2 = QGroupBox("Group 2")
    groupBox2.setLayout(layout2)

    nestedWidgetLayout = QVBoxLayout()
    nestedWidgetLayout.addWidget(groupBox1)
    nestedWidgetLayout.addWidget(groupBox2)
    nestedWidget = QWidget()
    nestedWidget.setLayout(nestedWidgetLayout)

    scrollArea = QScrollArea()
    scrollArea.setWidget(nestedWidget)

    mainLayout = QVBoxLayout()
    mainLayout.addWidget(scrollArea)
    dlg.setLayout(mainLayout)

    dlg.show()

    app.exec()
Solution

  • The @a_manthey_67 solution gives us a starting point but has several limitations:

    • It is calculated for a specific number of items so if items are added/deleted it will fail.
    • Manually set the height of each item instead of obtaining the height set by the style.

    Considering the above, I have implemented a similar logic using sizeHintForRow(), in addition to enabling the widgetResizable property of the QScrollArea and disabling the verticalScrollBar.

    import sys

from PyQt5.QtCore import pyqtSlot, Qt
from PyQt5.QtWidgets import (
    QApplication,
    QDialog,
    QGroupBox,
    QLabel,
    QListWidget,
    QListWidgetItem,
    QScrollArea,
    QVBoxLayout,
    QWidget,
)


class ListWidget(QListWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.model().rowsInserted.connect(self._recalcultate_height)
        self.model().rowsRemoved.connect(self._recalcultate_height)

    @pyqtSlot()
    def _recalcultate_height(self):
        h = sum([self.sizeHintForRow(i) for i in range(self.count())])
        self.setFixedHeight(h)


if __name__ == "__main__":
    app = QApplication(sys.argv)

    dlg = QDialog()

    listWidget = ListWidget()
    for i in range(100):
        listWidget.addItem(QListWidgetItem("Item " + str(i)))

    layout1 = QVBoxLayout()
    layout1.addWidget(QLabel("Label 1"))
    groupBox1 = QGroupBox("Group 1")
    groupBox1.setLayout(layout1)

    layout2 = QVBoxLayout()
    layout2.addWidget(listWidget)
    groupBox2 = QGroupBox("Group 2")
    groupBox2.setLayout(layout2)

    nestedWidget = QWidget()
    nestedWidgetLayout = QVBoxLayout(nestedWidget)
    nestedWidgetLayout.addWidget(groupBox1)
    nestedWidgetLayout.addWidget(groupBox2)

    scrollArea = QScrollArea(widgetResizable=True)
    scrollArea.setWidget(nestedWidget)

    mainLayout = QVBoxLayout(dlg)
    mainLayout.addWidget(scrollArea)

    dlg.show()

    sys.exit(app.exec_())