是否可以以某种方式自定义 QTabWidget？

Question

MAXIM045

Asked:2020-09-13 14:46:49 +0000 UTC2020-09-13 14:46:49 +0000 UTC 2020-09-13 14:46:49 +0000 UTC

QListWidget 没有按我的预期工作

772

我的代码由三个类组成：

RoundArt，它创建一个带有圆角的图像；
ListWidget，它QListWidget具有某些特征（重要 - 它没有滚动条）；
MyWindow，它创建应用程序窗口。

在MyWindow我创建一个主容器中，我添加了一个带有滚动条box的垂直容器。box_1

它box_1有4个小部件：

铭文label_1；
一个小部件list_widget_1，它是类的副本ListWidget并且是QListWidget;
铭文label_2；
一个小部件list_widget_2，它是类的副本ListWidget并且是QListWidget.

小部件list_widget_1和list_widget_2我用圆角的图像填充，RoundArt.

我认为box_1拥有一个垂直滚动条将允许小部件list_widget_1既list_widget_2占用他们需要的空间又垂直拉伸——但这并没有发生。内容ListWidget'ов向下移动，不再可见：

我还需要list_widget_1占用list_widget_2尽可能多的空间来正常显示其中的所有元素：

正如我在图片中显示的那样，它list_widget_1占用了所需的空间，其余的小部件（label_2和list_widget_2）向下移动，滚动条允许您查看它们。同时，如果有空闲空间list_widget_1，它们必须保留水平排列元素的能力。list_widget_2请告诉我我该怎么做？

from PyQt5 import QtCore, QtWidgets, QtGui

class RoundArt(QtWidgets.QLabel):
    clicked = QtCore.pyqtSignal()

    def __init__(self, picture: str, x: int, *args, **kwargs):
        super(RoundArt, self).__init__(*args, **kwargs)

        self.setFixedSize(x, x)
        self.x = x
        self.radius = 10 

        self.setPicture(picture)

    def setPicture(self, picture: str):
        target = QtGui.QPixmap(self.size())
        target.fill(QtCore.Qt.transparent)

        p = QtGui.QPixmap(picture).scaled(
            self.x, self.x, QtCore.Qt.KeepAspectRatioByExpanding,
            QtCore.Qt.SmoothTransformation
        )

        painter = QtGui.QPainter(target)
        painter.setRenderHint(QtGui.QPainter.Antialiasing, True)
        painter.setRenderHint(QtGui.QPainter.HighQualityAntialiasing, True)
        painter.setRenderHint(QtGui.QPainter.SmoothPixmapTransform, True)

        path = QtGui.QPainterPath()
        path.addRoundedRect(0, 0, self.width(), self.height(), self.radius, self.radius)
        painter.setClipPath(path)
        painter.drawPixmap(0, 0, p)
        self.setPixmap(target)

        painter.end()
        target = None

    def mouseReleaseEvent(self, event):
        self.clicked.emit()


class ListWidget(QtWidgets.QListWidget):
    def __init__(self, *args, **kwargs):
        super(ListWidget, self).__init__(*args, **kwargs)
        self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        self.setEditTriggers(self.NoEditTriggers)
        self.setDefaultDropAction(QtCore.Qt.IgnoreAction)
        self.setSelectionMode(self.ContiguousSelection)
        self.setFlow(self.LeftToRight)
        self.setWrapping(True)
        self.setResizeMode(self.Adjust)
        self.setSpacing(14)
        self.setContentsMargins(30, 30, 0, 30)
        self._rubberPos  = None
        self._rubberBand = QtWidgets.QRubberBand(QtWidgets.QRubberBand.Rectangle, self)

    def makeItem(self, lb):
        item = QtWidgets.QListWidgetItem(self)
        item.setSizeHint(QtCore.QSize(140, 140))
        self.setItemWidget(item, lb)

class MyWindow(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        scrollArea = QtWidgets.QScrollArea()
        content_widget = QtWidgets.QWidget()
        scrollArea.setStyleSheet("border-style: hidden;")
        scrollArea.setWidget(content_widget)
        scrollArea.setWidgetResizable(True)
        scrollArea.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        box_1 = QtWidgets.QVBoxLayout(content_widget)
        box = QtWidgets.QHBoxLayout(self)
        box.addWidget(scrollArea)

        list_widget_1 = ListWidget()
        list_widget_2 = ListWidget()

        label_1 = QtWidgets.QLabel('label 1')
        box_1.addWidget(label_1)

        box_1.addWidget(list_widget_1)

        label_2 = QtWidgets.QLabel('label 2')
        box_1.addWidget(label_2)        

        box_1.addWidget(list_widget_2)

        for i in range(5):
            art = RoundArt('album', 150)
            list_widget_1.makeItem(art)

        for i in range(5):
            art = RoundArt('album', 150)
            list_widget_2.makeItem(art)  

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    window = MyWindow()
    window.setWindowTitle(' ')
    window.show()
    sys.exit(app.exec_())

升级版：

from PyQt5 import QtCore, QtWidgets, QtGui

class RoundArt(QtWidgets.QLabel):
    clicked = QtCore.pyqtSignal()

    def __init__(self, picture: str, x: int, *args, **kwargs):
        super(RoundArt, self).__init__(*args, **kwargs)
        self.setFixedSize(x, x)
        self.x = x
        self.radius = 10  
        self.setPicture(picture)

    def setPicture(self, picture: str):
        target = QtGui.QPixmap(self.size())
        target.fill(QtCore.Qt.transparent)

        p = QtGui.QPixmap(picture).scaled(
            self.x, self.x, 
            QtCore.Qt.KeepAspectRatioByExpanding,
            QtCore.Qt.SmoothTransformation
        )

        painter = QtGui.QPainter(target)
        painter.setRenderHint(QtGui.QPainter.Antialiasing, True)
        painter.setRenderHint(QtGui.QPainter.HighQualityAntialiasing, True)
        painter.setRenderHint(QtGui.QPainter.SmoothPixmapTransform, True)

        path = QtGui.QPainterPath()
        path.addRoundedRect(0, 0, self.width(), self.height(), self.radius, self.radius)
        painter.setClipPath(path)
        painter.drawPixmap(0, 0, p)
      
        self.setPixmap(target)
        painter.end()
        target = None

    def mouseReleaseEvent(self, event):
        self.clicked.emit()


class ListWidget(QtWidgets.QListWidget):
    def __init__(self, *args, **kwargs):
        super(ListWidget, self).__init__(*args, **kwargs)
        
        self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        
        self.setEditTriggers(self.NoEditTriggers)
        self.setDefaultDropAction(QtCore.Qt.IgnoreAction)
        self.setSelectionMode(self.ContiguousSelection)
        self.setFlow(self.LeftToRight)
        self.setWrapping(True)
        self.setResizeMode(self.Adjust)
        self.setSpacing(10)
        #self.setContentsMargins(100, 100, 100, 100)             
        self._rubberPos  = None
        self._rubberBand = QtWidgets.QRubberBand(QtWidgets.QRubberBand.Rectangle, self)

    def makeItem(self, lb):
        item = QtWidgets.QListWidgetItem(self)
        item.setSizeHint(QtCore.QSize(150, 150))
        self.setItemWidget(item, lb)
        
    def updateHeight(self):
        self.setMaximumHeight(self.sizeHint().height())

    def getHeight(self, parent=None):
        height = 0
        if not parent:
            parent = self.rootIndex()
        for row in range(self.model().rowCount(parent)):
            child = self.model().index(row, 0, parent)
            height += 150 
        return height

    def sizeHint(self):
        hint = super().sizeHint()
        hint.setHeight(self.getHeight())
        return hint

    def minimumSizeHint(self):
        return self.sizeHint()
        

class MyWindow(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.dict = {} # словарь для хранения QListWidget'ов и количества изображений внутри них

        scrollArea = QtWidgets.QScrollArea()
        content_widget = QtWidgets.QWidget()
        #scrollArea.setStyleSheet("border-style: hidden;")
        scrollArea.setWidget(content_widget)
        scrollArea.setWidgetResizable(True)
        scrollArea.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        self.box_1 = QtWidgets.QVBoxLayout(content_widget)
        box = QtWidgets.QHBoxLayout(self)
        box.addWidget(scrollArea)

        self.list_widget_1 = ListWidget()
        self.list_widget_2 = ListWidget()

        self.label_1 = QtWidgets.QLabel('label 1')
        self.box_1.addWidget(self.label_1)
        self.box_1.addWidget(self.list_widget_1, stretch = 1)
        
        label_2 = QtWidgets.QLabel('label 2')
        self.box_1.addWidget(label_2)        
        self.box_1.addWidget(self.list_widget_2, stretch=1)
        
        self.box_1.addStretch(100)

        a = 11 # любое число, позже программа будет получать его самостоятельно
        for i in range(a):
            art = RoundArt('album.png', 150)
            self.list_widget_1.makeItem(art)
            self.dict[self.list_widget_1] = a

        b = 5 # любое число, позже программа будет получать его самостоятельно
        for i in range(b):
            art = RoundArt('album.png', 150)
            self.list_widget_2.makeItem(art)
            self.dict[self.list_widget_2] = b

    def resizeEvent(self, event):
        l = 150 # размер стороны изображения
        d = 10 # отступ между изображениями
        m = l + 2*d
        for widget in self.dict:
            n = self.dict[widget] # количество изображений
            k = (widget.width() - 4.5)//m
            if n % k  == 0:
                h = m*(n // k) + 4
            else:
                h = m*(n // k + 1) + 4
            widget.setMinimumHeight(h)

        self.update()
        super(MyWindow, self).resizeEvent(event)


if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    window = MyWindow()
    window.setWindowTitle(' ')
    window.show()
    sys.exit(app.exec_())

1 个回答

Voted

S. Nick · Answer 1 · 2020-09-13T23:48:45Z

我可能在调试、实验时写了一些多余的东西，如果你发现一些不必要的东西，删除或更正它。祝你好运。

from PyQt5 import QtCore, QtWidgets, QtGui


class RoundArt(QtWidgets.QLabel):
    clicked = QtCore.pyqtSignal()

    def __init__(self, picture: str, x: int, num, *args, **kwargs):  # num для отладки 
        super(RoundArt, self).__init__(*args, **kwargs)
        self.num = num                                               # num для отладки 
        self.setFixedSize(x, x)
        self.x = x
        self.radius = 10  
        self.setPicture(picture)

    def setPicture(self, picture: str):
        target = QtGui.QPixmap(self.size())
        target.fill(QtCore.Qt.transparent)

        p = QtGui.QPixmap(picture).scaled(
            self.x, self.x, 
            QtCore.Qt.KeepAspectRatioByExpanding,
            QtCore.Qt.SmoothTransformation
        )

        painter = QtGui.QPainter(target)
        painter.setRenderHint(QtGui.QPainter.Antialiasing, True)
        painter.setRenderHint(QtGui.QPainter.HighQualityAntialiasing, True)
        painter.setRenderHint(QtGui.QPainter.SmoothPixmapTransform, True)

        path = QtGui.QPainterPath()
        path.addRoundedRect(0, 0, self.width(), self.height(), self.radius, self.radius)
        painter.setClipPath(path)
        painter.drawPixmap(0, 0, p)
# +++ vvv  для отладки    
        path.addText(QtCore.QPoint(65, 90), 
                     QtGui.QFont("Times", 30, QtGui.QFont.Bold), 
                     str(self.num));
        painter.setBrush(QtGui.QColor(255, 0, 0, 15));
        painter.setPen(QtCore.Qt.red);
        painter.drawPath(path)
# +++ ^^^        
        self.setPixmap(target)
        painter.end()
        target = None

    def mouseReleaseEvent(self, event):
        self.clicked.emit()


class ListWidget(QtWidgets.QListWidget):
    def __init__(self, *args, **kwargs):
        super(ListWidget, self).__init__(*args, **kwargs)
        
        self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        
        self.setEditTriggers(self.NoEditTriggers)
        self.setDefaultDropAction(QtCore.Qt.IgnoreAction)
        self.setSelectionMode(self.ContiguousSelection)
        self.setFlow(self.LeftToRight)
        self.setWrapping(True)
        self.setResizeMode(self.Adjust)
        self.setSpacing(14)
        self.setContentsMargins(30, 30, 0, 30)             
        self._rubberPos  = None
        self._rubberBand = QtWidgets.QRubberBand(QtWidgets.QRubberBand.Rectangle, self)

    def makeItem(self, lb):
        item = QtWidgets.QListWidgetItem(self)
        item.setSizeHint(QtCore.QSize(150, 150))                         # ??? 140, 140
        self.setItemWidget(item, lb)
        
# +++ vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
    def updateHeight(self):
        self.setMaximumHeight(self.sizeHint().height())

    def getHeight(self, parent=None):
        height = 0
        if not parent:
            parent = self.rootIndex()
        for row in range(self.model().rowCount(parent)):
            child = self.model().index(row, 0, parent)
            height += 150 
        return height

    def sizeHint(self):
        hint = super().sizeHint()
        hint.setHeight(self.getHeight())
        return hint

    def minimumSizeHint(self):
        return self.sizeHint()    
# +++ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        

class MyWindow(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        scrollArea = QtWidgets.QScrollArea()
        content_widget = QtWidgets.QWidget()
        scrollArea.setStyleSheet("border-style: hidden;")
        scrollArea.setWidget(content_widget)
        scrollArea.setWidgetResizable(True)
        scrollArea.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        self.box_1 = QtWidgets.QVBoxLayout(content_widget)  # self.
        box = QtWidgets.QHBoxLayout(self)
        box.addWidget(scrollArea)

        self.list_widget_1 = ListWidget()                   # self.
        self.list_widget_2 = ListWidget()

        self.label_1 = QtWidgets.QLabel('label 1')           # self.
        self.box_1.addWidget(self.label_1)
        self.box_1.addWidget(self.list_widget_1, stretch=1)  # stretch=1
        
        label_2 = QtWidgets.QLabel('label 2')
        self.box_1.addWidget(label_2)        
        self.box_1.addWidget(self.list_widget_2, stretch=1)  # , stretch=1 
        
        self.box_1.addStretch(1)                             # +

        for i in range(5):
#            art = RoundArt('album', 150)
            art = RoundArt('_ph_.png', 150, i)                # + i для отладки
            self.list_widget_1.makeItem(art)

        for i in range(5):
            art = RoundArt('150_150.png', 150, i)             # + i для отладки
            self.list_widget_2.makeItem(art)  
            
    def resizeEvent(self, event):  
        if self.width() < 414:
            self.list_widget_1.setMinimumHeight(960)
            self.list_widget_2.setMinimumHeight(960)
        elif 414 <= self.width() < 592:
            self.list_widget_1.setMinimumHeight(576)
            self.list_widget_2.setMinimumHeight(576)            
        elif 592 <= self.width() < 948:
            self.list_widget_1.setMinimumHeight(384)
            self.list_widget_2.setMinimumHeight(384)            
        else:
            self.list_widget_1.setMinimumHeight(192) 
            self.list_widget_2.setMinimumHeight(192)

        self.update()
        super(MyWindow, self).resizeEvent(event)    


if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    window = MyWindow()
    window.setWindowTitle(' ')
    window.show()
    sys.exit(app.exec_())

更新

...我修改了您的代码并将其添加到我的问题中。出于某种原因，我仍然找不到它，因为。一切似乎都在工作。这很奇怪，所以我决定再次与您联系。如果你有时间，你能检查一下这个代码是否有错误吗？

我检查了您在更新中发布的几个选项的示例（我没有检查计算逻辑）。我唯一发现的是，在加载应用程序时，窗口显示不正确，但调整窗口大小显示正确。

我建议像这样修复它：

...

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    window = MyWindow()
    window.setWindowTitle(' ')
    window.show()
    
    print(window.size())                     # +++  для отладки
    window.resize(300, 335)                  # +++  после show() !!!
    
    sys.exit(app.exec_())

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1 个回答

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