PyQt5 QWidget未填充父項

Question

我正在PyQt5中創建代碼編輯器。 我在中心小部件中使用QGridLayout並從那里構建UI。 我面臨的問題是QPlainTextEdit和菜單不能填充中心小部件上的可用空間。 我嘗試將大小策略設置為擴展，並嘗試調整QGridLayout的拉伸參數。

我正在python 2.7和PyQt 5中運行代碼。使用PyCharm IDE。

Main.py

import os
import sys
from PyQt5.QtWidgets import QMainWindow, QApplication, QAction

from PyQt5.QtGui import QIcon

import UI

versao = '3.0.0'


class Principal(QMainWindow):

    def __init__(self):
        super(Principal, self).__init__()

        self.acao_novo = 0
        self.acao_abrir = 0
        self.acao_exemplos = 0
        self.acao_sair = 0
        self.acao_salvar = 0
        self.acao_salvar_como = 0
        self.acao_comentar_linha = 0
        self.acao_achar = 0
        self.acao_achar_e_substituir = 0
        self.acao_ir_para_linha = 0
        self.acao_placa = 0
        self.acao_porta = 0
        self.acao_lingua = 0
        self.acao_monitor_serial = 0
        self.acao_verificar = 0
        self.acao_verificar_e_carregar = 0

        self.init_ui()

    def init_ui(self):

        self.setCentralWidget(UI.Centro())

        self.setGeometry(300, 300, 500, 550)
        self.setWindowTitle('Br.ino ' + versao)
        self.setWindowIcon(QIcon(os.path.join('recursos', 'logo.png')))
        self.show()

def main():
    app = QApplication(sys.argv)
    principal = Principal()
    app.setStyleSheet("""QMainWindow {
                             background: '#252525';
                         }
                         QMenu{
                             background: '#252525';
                         }
                         QMenu::item {
                             background: '#252525';
                         } 
                         QMenu::item:selected{
                             background: '#101010';
                         }
                         QMenuBar {
                             background: '#252525';
                         }
                         QMenuBar::item {
                             background: '#252525';
                         } 
                         QMenuBar::item:selected{
                             background: '#101010';
                         }
                         QPlainTextEdit{
                             background: '#252525';
                             border: None;
                             border-radius: 6px;
                             color: '#efefef';
                             selection-background-color: '#454545';
                         }""")
    sys.exit(app.exec_())


if __name__ == '__main__':
    main() 

UI.py

from PyQt5.QtWidgets import (QWidget, QGridLayout, QPlainTextEdit, QVBoxLayout, QSpacerItem, QSizePolicy, QAbstractButton)
import os
from PyQt5.QtGui import QPixmap, QPainter
from PyQt5.QtCore import QSize


class Centro(QWidget):

    def __init__(self):
        super(Centro, self).__init__()
        self.layout = 0

        self.init_ui()

    def init_ui(self):
        layout = QGridLayout(self)
        layout.setRowStretch(0, 7.5)
        layout.setRowStretch(1, 2.5)
        layout.setColumnStretch(0, 1)
        layout.setColumnStretch(1, 5)
        menu = Menu.Menu()
        layout.addWidget(menu, 0, 0, 1, 0)
        layout.setSpacing(10)
        layout.setContentsMargins(0, 0, 0, 0)

        container = QWidget(self)
        container.setStyleSheet("background:#252525")
        editor = QPlainTextEdit(container)
        layout.addWidget(container, 0, 1, 9, 9)

        container_log = QWidget(self)
        log = QPlainTextEdit(container_log)
        log.setStyleSheet("background:#000000")
        log.setDisabled(True)
        layout.addWidget(container_log, 1, 1, 1, 8)

        self.show()


class Menu(QWidget):

    def __init__(self):
        super(Menu, self).__init__()
        self.layout = 0

        self.init_ui()

    def init_ui(self):
        container = QWidget(self)
        container.setFixedWidth(60)
        layout = QVBoxLayout(container)
        container.setStyleSheet("background-color: '#5cb50d';")

        btn_compilar = botaoImagem(QPixmap(os.path.join('recursos', 'compilarFoco.png')), self)
        btn_compilar_e_carregar = botaoImagem(QPixmap(os.path.join('recursos', 'carregarFoco.png')), self)
        btn_novo = botaoImagem(QPixmap(os.path.join('recursos', 'novoArquivoFoco.png')), self)
        btn_abrir = botaoImagem(QPixmap(os.path.join('recursos', 'abrirPastaFoco.png')), self)
        btn_salvar = botaoImagem(QPixmap(os.path.join('recursos', 'salvarFoco.png')), self)
        btn_monitor_serial = botaoImagem(QPixmap(os.path.join('recursos', 'monitorSerialFoco.png')), self)
        btn_monitor_serial.setFixedSize(50, 50)

        layout.setContentsMargins(5, 5, 5, 0)
        espacador_vertical = QSpacerItem(0, 500000000, QSizePolicy.Minimum, QSizePolicy.Expanding)
        layout.addWidget(btn_compilar)
        layout.addWidget(btn_compilar_e_carregar)
        layout.addWidget(btn_novo)
        layout.addWidget(btn_abrir)
        layout.addWidget(btn_salvar)
        layout.addWidget(btn_monitor_serial)
        layout.addItem(espacador_vertical)

        self.show()


class botaoImagem(QAbstractButton):
    def __init__(self, pixmap, parent=None):
        super(botaoImagem, self).__init__(parent)
        self.pixmap = pixmap

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.drawPixmap(event.rect(), self.pixmap)

    def sizeHint(self):
        return QSize(50, 63)

預期結果如下（此屏幕快照是使用Java開發的先前版本，因此包含一些尚未實現的功能）：

Answer 1

不要創建“容器”小部件，不需要它們。 將小部件直接添加到布局中。

您的問題是，盡管您正在設置布局，但是您是將容器小部件添加到沒有布局的父級中，因此容器無法縮放。

即與

container = QWidget(self)
container.setStyleSheet("background:#252525")
editor = QPlainTextEdit(container)
layout.addWidget(container, 0, 1, 9, 9)

寫

editor = QPlainTextEdit(self)
editor.setStyleSheet("background:#252525")
layout.addWidget(editor, 0, 1, 9, 9)

更新：這是Menu

layout = QVBoxLayout(self)
self.setFixedWidth(60)
self.setStyleSheet("background-color: '#5cb50d';")