0

我正在使用 Python 3.9.5 和 PyQt6。

在我之前的问题之后，我想问一下如何动态调整 QGroupBox 的大小以适应其内容。

我有一个QScrollArea，它的布局是一个QVBoxLayout，会在QVBoxLayout中加入一堆QGroupBox。

QGroupBox本身有一个QVBoxLayout，QVBoxLayout里面是一堆QVBoxLayout，QGroupBox的QVBoxLayout里面是QVBoxLayout里面的内容。

每个最低级别的 QVBoxLayout 都有两个小部件和一个 QHBoxLayout。

从上到下，第一个小部件是一个 QLabel，它是固定大小的 100x20，第二个小部件是一个 QTextEdit，它可以自动调整大小。QHBoxLayout 内部是一个大小为 60x20 的拉伸和固定大小的按钮，该按钮可以隐藏或显示。

小部件和布局的层次结构是这样的：

QVBoxLayout — level 0
    QScrollArea — level 1
        QVBoxLayout0 — level 2
            QGroupBox — level 3 (checkable)
                QVBoxLayout1 — level 4
                    QLabel — level 5 (fixed)
                    QTextEdit — level 5 (auto-resizing)
                    QHBoxLayout — level 5
                        Stretch — level 6
                        QPushButton — level 6 (fixed)

我希望 QGroupBoxs 自动调整大小以适应其内容。

宽度由布局决定，我希望 QGroupBoxs 具有基于其内容的固定、最小、最佳高度。

基本上，高度应该是其所有 VISIBLE 小部件的高度之和，加上上边距和下边距，以及小部件之间的边距，也许还有复选框的高度。

我想为 QGroupBoxs 设置固定高度，因为如果我不这样做，布局将拉伸 QGroupBoxs 并将其定位在中间，而不是在顶部的最小高度，这不是我想要的。

我将在下面发布示例代码：

from PyQt6.QtCore import *
from PyQt6.QtGui import *
from PyQt6.QtWidgets import *

font = QFont('Noto Serif', 9)

def makebutton(text):
    button = QPushButton()
    button.setFont(font)
    button.setFixedSize(60, 20)
    button.setText(text)
    return button

class Editor(QTextEdit):
    doubleClicked = pyqtSignal(QTextEdit)
    def __init__(self):
        super().__init__()
        self.setReadOnly(True)
        self.setFont(font)
        self.setFixedHeight(20)
        self.setAttribute(Qt.WidgetAttribute.WA_DontShowOnScreen)
        self.show()
        self.textChanged.connect(self.autoResize)
    
    def mouseDoubleClickEvent(self, e: QMouseEvent) -> None:
        self.doubleClicked.emit(self)
    
    def autoResize(self):
        self.document().setTextWidth(self.viewport().width())
        margins = self.contentsMargins()
        height = int(self.document().size().height() + margins.top() + margins.bottom())
        self.setFixedHeight(height)
    
    def resizeEvent(self, event):
        self.autoResize()


class textcell(QVBoxLayout):
    def __init__(self, text):
        super().__init__()
        self.setAlignment(Qt.AlignmentFlag.AlignLeft | Qt.AlignmentFlag.AlignTop)
        self.label = QLabel(text)
        self.label.setFixedSize(80, 20)
        self.apply = makebutton('Apply')
        self.apply.hide()
        self.editor = Editor()
        self.editor.doubleClicked.connect(self.on_DoubleClick)
        self.hbox = QHBoxLayout()
        self.hbox.addStretch()
        self.hbox.addWidget(self.apply)
        self.addWidget(self.label)
        self.addWidget(self.editor)
        self.addLayout(self.hbox)
        self.apply.clicked.connect(self.on_ApplyClick)
    
    def on_DoubleClick(self):
        self.editor.setReadOnly(False)
        self.apply.show()
    
    def on_ApplyClick(self):
        self.editor.setReadOnly(True)
        self.apply.hide()


class songpage(QGroupBox):
    def __init__(self, texts):
        super().__init__()
        self.init(texts)
        self.setCheckable(True)
        self.setChecked(False)
        self.setAlignment(Qt.AlignmentFlag.AlignLeft | Qt.AlignmentFlag.AlignTop)
    
    def init(self, texts):
        self.vbox = QVBoxLayout()
        self.vbox.setAlignment(Qt.AlignmentFlag.AlignLeft | Qt.AlignmentFlag.AlignTop)
        self.vbox.setSizeConstraint(QLayout.SizeConstraint.SetMinimumSize)
        artist = textcell('Artist')
        artist.editor.setText(texts[0])
        album = textcell('Album')
        album.editor.setText(texts[2])
        title = textcell('Title')
        title.editor.setText(texts[1])
        self.height = 120 + artist.editor.height() + album.editor.height() + title.editor.height()
        self.vbox.addLayout(artist)
        self.vbox.addLayout(album)
        self.vbox.addLayout(title)
        print(self.children())
        print(self.vbox.children())
        print(self.vbox.count())
        print(artist.count())
        print(artist.children())
        print(artist.contentsMargins().top())
        print(artist.contentsMargins().bottom())
        print(self.vbox.contentsMargins().top())
        print(self.vbox.contentsMargins().bottom())
        print(self.contentsMargins().top())
        print(self.contentsMargins().bottom())
        print(self.childrenRect().height())
        print(self.contentsRect().height())
        print(artist.apply.isHidden())
        print(artist.editor.isHidden())
        print(artist.label.isHidden())
        print(artist.label.isVisible())
        print(self.sizeHint().height())
        self.setLayout(self.vbox)
        self.setFixedHeight(self.height)

class Window(QMainWindow):
    def __init__(self):
        super().__init__()
        self.resize(405, 720)
        frame = self.frameGeometry()
        center = self.screen().availableGeometry().center()
        frame.moveCenter(center)
        self.move(frame.topLeft())
        self.centralwidget = QWidget(self)
        self.vbox = QVBoxLayout(self.centralwidget)
        self.scrollArea = QScrollArea(self.centralwidget)
        self.scrollArea.setWidgetResizable(True)
        self.scrollAreaWidgetContents = QWidget()
        self.scrollArea.setVerticalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOn)
        self.verticalLayout = QVBoxLayout(self.scrollAreaWidgetContents)
        self.verticalLayout.setAlignment(Qt.AlignmentFlag.AlignTop)
        self.scrollArea.setWidget(self.scrollAreaWidgetContents)
        self.scrollArea.setAlignment(Qt.AlignmentFlag.AlignLeft | Qt.AlignmentFlag.AlignTop)
        self.add = makebutton('Add')
        self.vbox.addWidget(self.add)
        self.add.clicked.connect(lambda: adder.addItem())
        self.vbox.addWidget(self.scrollArea)
        self.setCentralWidget(self.centralwidget)

class Adder:
    def __init__(self):
        self.i = 0
    def addItem(self):
        window.verticalLayout.addWidget(songpage(items[self.i]))
        if self.i < len(items) - 1:
            self.i += 1

adder = Adder()

items = [('Herbert von Karajan',
    "Orphée aux enfers, 'Orpheus in the Underworld'\u2014Overture",
    '100 Best Karajan'),
    ('Herbert von Karajan', 'Radetzky March Op. 228', '100 Best Karajan'),
    ('Herbert von Karajan',
    'Symphony No. 1 in C, Op. 21\u2014I. Adagio molto \u2014 Allegro con brio',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 1 in C, Op. 21\u2014II. Andante cantabile con moto',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 1 in C, Op. 21\u2014III. Menuetto (Allegro molto e vivace)',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 1 in C, Op. 21\u2014IV. Finale (Adagio \u2014 Allegro molto e vivace)',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 2 in D, Op. 36\u2014I. Adagio molto \u2014 Allegro con brio',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 2 in D, Op. 36\u2014II. Larghetto',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 2 in D, Op. 36\u2014III. Scherzo (Allegro)',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 2 in D, Op. 36\u2014IV. Allegro molto',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 3 in E\u2014Flat, Op. 55 \u2014Eroica\u2014I. Allegro con brio',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 3 in E\u2014Flat, Op. 55 \u2014Eroica\u2014II. Marcia funebre (Adagio assai)',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 3 in E\u2014Flat, Op. 55 \u2014Eroica\u2014III. Scherzo (Allegro vivace)',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 3 in E\u2014Flat, Op. 55 \u2014Eroica\u2014IV. Finale (Allegro molto)',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 4 in B\u2014Flat, Op. 60\u2014I. Adagio \u2014 Allegro vivace',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 4 in B\u2014Flat, Op. 60\u2014II. Adagio',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 4 in B\u2014Flat, Op. 60\u2014III. Allegro vivace',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 4 in B\u2014Flat, Op. 60\u2014IV. Allegro ma non troppo',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 5 in C Minor, Op. 67\u2014I. Allegro con brio',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 5 in C Minor, Op. 67\u2014II. Andante con moto',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 5 in C Minor, Op. 67\u2014III. Allegro',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 5 in C Minor, Op. 67\u2014IV. Allegro',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 7 in A, Op. 92\u2014I. Poco sostenuto \u2014 Vivace',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 7 in A, Op. 92\u2014II. Allegretto',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 7 in A, Op. 92\u2014III. Presto \u2014 Assai meno presto',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 7 in A, Op. 92\u2014IV. Allegro con brio',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 8 in F, Op. 93\u2014I. Allegro vivace e con brio',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 8 in F, Op. 93\u2014II. Allegretto scherzando',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 8 in F, Op. 93\u2014III. Tempo di menuetto',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 8 in F, Op. 93\u2014IV. Allegro vivace',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 9 in D Minor, Op. 125 \u2014 Choral\u2014I. Allegro ma non troppo, un poco maestoso',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 9 in D Minor, Op. 125 \u2014 Choral\u2014II. Molto vivace',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 9 in D Minor, Op. 125 \u2014 Choral\u2014III. Adagio molto e cantabile',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 9 in D Minor, Op. 125 \u2014 Choral\u2014IV. Presto',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No. 9 in D Minor, Op. 125 \u2014 Choral\u2014V. Presto\u2014 O Freunde, nicht diese T\u2014ne!\u2014Allegro assai',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No.6 in F, Op.68 \u2014Pastoral\u2014I. Erwachen heiterer Empfindungen bei der Ankunft auf dem Lande\u2014 Allegro ma non troppo',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No.6 in F, Op.68 \u2014Pastoral\u2014II. Szene am Bach\u2014 (Andante molto mosso)',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No.6 in F, Op.68 \u2014Pastoral\u2014III. Lustiges Zusammensein der Landleute (Allegro)',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No.6 in F, Op.68 \u2014Pastoral\u2014IV. Gewitter, Sturm (Allegro)',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Symphony No.6 in F, Op.68 \u2014Pastoral\u2014V. Hirtengesang. Frohe und dankbare Gefühle nach dem Sturm\u2014 Allegretto',
    'Beethoven\u2014 The 9 Symphonies'),
    ('Herbert von Karajan',
    'Cancan (Orpheus in the Underworld)',
    'Best of the Millennium\u2014 Top 40 Classical Hits'),
    ('Herbert von Karajan',
    'Hungarian Dance No. 5 in G Minor, WoO 1 No. 5',
    'Complete Recordings on Deutsche Grammophon')]



app = QApplication([])
window = Window()
window.show()
app.exec()

您可以看到 QGroupBoxs 没有处于最佳高度，如果双击 QTextEdits 并出现 Apply 按钮，则 groupbox 的顶部会变大，复选框处于尴尬的位置，当 QTextBoxs 调整为更少的行时，底部边框将变得不可见。

并且布局的边距始终为零，QGroupBox 的打印边距与观察到的边距不匹配，QGroupBox 的 childrenRects 高度始终为零，QGroupBox 的 contentsRects 高度始终为 478，这不如果我只.isHidden()将.isVisible()小部件添加到布局中而不调用其.show().

但是当我将它们添加到布局中时，它们总是自动可见的，除非我明确地制作它们.hide()。除非已设置，否则调用.show()将使已经可见的小部件在屏幕中央闪烁。Qt.WidgetAttribute.WA_DontShowOnScreen

那么我如何才能动态地计算出最佳的最小高度呢？

而且我不能使用.addStretch()，因为我需要 QGroupBox 之间的最小、最佳间距，并且我需要通过使用索引使内容可删除，.addStretch()这会破坏索引排序，因为在删除项目时不会删除拉伸。

4

1 回答 1

0

我终于做到了，问题是当我刚刚创建对象并没有将它们添加到主窗口时，它们都有默认的大小和值，并且当它们添加到窗口时值会发生变化。

所以我只需要在将它们添加到窗口后计算它们的大小并调整它们的大小。

在我的观察中，QGroupBoxs 中的 QVBoxLayouts 总是有 (9, 9, 9, 9) 的边距，而实际上小部件所在的所有布局都没有边距，而 QGroupBoxs 本身的边距是 (3, 20, 3, 3) 在我的主脚本中，所以我可以明确设置这些边距并使用这些值。

这就是我的做法：

class Label(QLabel):
    def __init__(self, text):
        super().__init__()
        self.setFont(font)
        self.fontRuler = QFontMetrics(font)
        self.setText(text)
        self.Height = self.fontRuler.size(0, text).height()
        self.Width = self.fontRuler.size(0, text).width()
        self.setFixedSize(self.Width, self.Height)


class Editor(QTextEdit):
    doubleClicked = pyqtSignal(QTextEdit)
    
    def __init__(self):
        super().__init__()
        self.setReadOnly(True)
        self.setFont(font)
        self.setFixedHeight(20)
        self.textChanged.connect(self.autoResize)
    
    def mouseDoubleClickEvent(self, e: QMouseEvent) -> None:
        self.doubleClicked.emit(self)
    
    def autoResize(self):
        self.document().setTextWidth(self.viewport().width())
        margins = self.contentsMargins()
        height = int(self.document().size().height() +
                    margins.top() + margins.bottom())
        self.setFixedHeight(height)
    
    def resizeEvent(self, e: QResizeEvent) -> None:
        self.autoResize()


class TextCell(QVBoxLayout):
    resize = pyqtSignal(QVBoxLayout)
    
    def __init__(self, text):
        super().__init__()
        self.setAlignment(Qt.AlignmentFlag.AlignLeft |
                        Qt.AlignmentFlag.AlignTop)
        self.label = Label(text)
        self.apply = makebutton('Apply')
        self.apply.hide()
        self.editor = Editor()
        self.editor.doubleClicked.connect(self.on_DoubleClick)
        self.editor.doubleClicked.connect(lambda: self.resize.emit(self))
        self.hbox = QHBoxLayout()
        self.hbox.addStretch()
        self.hbox.addWidget(self.apply)
        self.addWidget(self.label)
        self.addWidget(self.editor)
        self.addLayout(self.hbox)
        self.apply.clicked.connect(self.on_ApplyClick)
        self.apply.clicked.connect(lambda: self.resize.emit(self))
    
    def on_DoubleClick(self):
        self.editor.setReadOnly(False)
        self.apply.show()
    
    def on_ApplyClick(self):
        self.editor.setReadOnly(True)
        self.apply.hide()
    
    def get_Height(self):
        height = 0
        for i in range(self.count()):
            item = self.itemAt(i)
            if item.widget():
                widget = item.widget()
            else:
                widget = item.itemAt(1).widget()
            if not widget.isHidden():
                height += widget.height()
                height += 9
        return height


class SongPage(QGroupBox):
    def __init__(self, texts):
        super().__init__()
        self.init(texts)
        self.setCheckable(True)
        self.setChecked(False)
        self.setAlignment(Qt.AlignmentFlag.AlignLeft |
                        Qt.AlignmentFlag.AlignTop)
    
    def init(self, texts):
        self.vbox = QVBoxLayout()
        self.vbox.setAlignment(Qt.AlignmentFlag.AlignLeft |
                            Qt.AlignmentFlag.AlignTop)
        self.vbox.setSizeConstraint(QLayout.SizeConstraint.SetMinimumSize)
        self.artist = TextCell('Artist')
        self.artist.editor.setText(texts[0])
        self.album = TextCell('Album')
        self.album.editor.setText(texts[1])
        self.title = TextCell('Title')
        self.title.editor.setText(texts[2])
        self.vbox.addLayout(self.artist)
        self.vbox.addLayout(self.album)
        self.vbox.addLayout(self.title)
        self.setContentsMargins(3, 20, 3, 3)
        self.vbox.setContentsMargins(9, 9, 9, 9)
        self.setLayout(self.vbox)
        self.artist.resize.connect(self.autoResize)
        self.album.resize.connect(self.autoResize)
        self.title.resize.connect(self.autoResize)
    
    def autoResize(self):
        height = sum(i.get_Height() for i in self.vbox.children()) + 23
        self.setFixedHeight(height)
    
    def resizeEvent(self, e: QResizeEvent) -> None:
        self.autoResize()

QGroupBoxs 自动调整大小正确，唯一的问题是复选框的位置，在我的主脚本中，复选框位于正确的位置，但在另一个具有相同类的脚本中，复选框位于错误的位置，但这不会影响主脚本。

当 QTextEdits 缩小时，它们的底部边框变得不可见。

于 2021-07-08T08:25:30.430 回答