PyQt 小部件在 QVBoxLayout 内的绝对位置

Question

我正在做一些 PyQt5 项目，我来自 Web 开发，我坚持做一些琐碎的任务。 我有一些 QVBoxLayout 并在其中放置 QWidget 只是为了通过 CSS 添加一些背景颜色。之后我想放一些图片，self.img 就在 QWidget 的中心。但我无法管理如何做到这一点。 它只是将我的图像呈现在 QWidget 的下方，仅此而已。

我尝试使用 move(x,y) 方法，尝试使用 QWidget 的背景图像但我失败了。所以我真的坚持了下来。

我试图寻找一些可能的方法来解决它，但我没有找到任何可以帮助我的方法。 如果有人可以帮助我，我将非常感谢您的任何意见。感谢您的帮助。

说实话 - 我是 PyQt 的新手。对不起，如果我问了一些愚蠢的问题，但我真的需要帮助。

这是我的代码

import sys

from PyQt5.QtCore import QPoint
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWidgets import QHBoxLayout
from PyQt5.QtWidgets import QLabel
from PyQt5.QtWidgets import QPushButton
from PyQt5.QtWidgets import QVBoxLayout
from PyQt5.QtWidgets import QWidget
from PyQt5.QtGui import QPixmap



class MainWindow(QWidget):

    def __init__(self):
        super(MainWindow, self).__init__()
        self.layout  = QVBoxLayout()
        self.layout.addWidget(TopContentBlock(self))
        self.layout.addWidget(BottomContentBlock(self))
        self.setLayout(self.layout)
        self.layout.setContentsMargins(0,0,0,0)
        self.layout.setSpacing(0)
        self.layout.addStretch(-1)
        self.setMinimumSize(640,400)
        self.setWindowFlags(Qt.FramelessWindowHint)
        self.pressing = False


class TopContentBlock(QWidget):

    def __init__(self, parent):
        super(TopContentBlock, self).__init__();
        self.parent = parent;
        self.layout = QVBoxLayout()
        self.layout.setContentsMargins(0, 0, 0, 0)

        self.content = QWidget()
        self.content.setFixedSize(640, 250)
        self.content.setStyleSheet("""
         background-color: #67BEC3;
        """)

        self.img = QLabel()
        pixmap = QPixmap('main_illustration.png')
        self.img.setPixmap(pixmap)
        print(pixmap.width(), pixmap.height())
        self.img.resize(pixmap.width(), pixmap.height())
        #self.img.setFixedSize(pixmap.width(), pixmap.height())

        self.layout.addWidget(self.img)
        self.layout.addWidget(self.content)
        self.setLayout(self.layout)


class BottomContentBlock(QWidget):

    def __init__(self, parent):
        super(BottomContentBlock, self).__init__();
        self.parent = parent;
        self.layout = QVBoxLayout()
        self.layout.setContentsMargins(0, 0, 0, 0)

        self.content = QWidget()
        self.content.setFixedSize(640, 400)
        self.content.setStyleSheet("""
            background-color: cyan;
        """)
        self.layout.addWidget(self.content)
        self.setLayout(self.layout)
if __name__ == "__main__":
    app = QApplication(sys.argv)
    mw = MainWindow()
    mw.show()
    sys.exit(app.exec_())


import resources_new

Answer 1

试试看：

import sys
from PyQt5.QtCore    import QPoint, Qt
from PyQt5.QtWidgets import (QApplication, QHBoxLayout, QLabel,
                             QPushButton, QVBoxLayout, QWidget)
from PyQt5.QtGui     import QPixmap


class MainWindow(QWidget):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.layout  = QVBoxLayout()
        self.layout.addWidget(TopContentBlock(self))
        self.layout.addWidget(BottomContentBlock(self))
        self.setLayout(self.layout)
        self.layout.setContentsMargins(0,0,0,0)
        self.layout.setSpacing(0)
#        self.layout.addStretch(1)
        self.setMinimumSize(640,600)                         # 600
        self.setWindowFlags(Qt.FramelessWindowHint)
#?        self.pressing = False


class TopContentBlock(QWidget):
    def __init__(self, parent):
        super(TopContentBlock, self).__init__();
#?        self.parent = parent;
        self.layout = QVBoxLayout()
        self.layout.setContentsMargins(0, 0, 0, 0)

        self.content = QWidget()
        self.content.setFixedSize(640, 200)                  #(640, 250)
        self.content.setStyleSheet("""
         background-color: #67BEC3;
        """)

        self.img = QLabel()
        self.img.setAlignment(Qt.AlignCenter)                # +++

        pixmap = QPixmap('im.png')                           #('main_illustration.png')
#        self.img.setPixmap(pixmap)
        self.img.setPixmap(pixmap.scaled(200, 200,           # +++
                                         Qt.IgnoreAspectRatio, 
                                         Qt.FastTransformation))
#        self.img.resize(pixmap.width(), pixmap.height())
        #self.img.setFixedSize(pixmap.width(), pixmap.height())

        self.layout.addWidget(self.img)
        self.layout.addWidget(self.content)
        self.layout.setSpacing(0)                            # +++
        self.setLayout(self.layout)


class BottomContentBlock(QWidget):
    def __init__(self, parent):
        super(BottomContentBlock, self).__init__();
        self.parent = parent;
        self.layout = QVBoxLayout()
        self.layout.setContentsMargins(0, 0, 0, 0)

        self.content = QWidget()
        self.content.setFixedSize(640, 200)               #(640, 400)
        self.content.setStyleSheet("""
            background-color: cyan;
        """)
        self.layout.addWidget(self.content)
        self.setLayout(self.layout)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    mw = MainWindow()
    mw.show()
    sys.exit(app.exec_())

---

更新

import sys
from PyQt5.QtCore    import QPoint, Qt
from PyQt5.QtWidgets import (QApplication, QHBoxLayout, QLabel,
                             QPushButton, QVBoxLayout, QWidget)
from PyQt5.QtGui     import QPixmap


class MainWindow(QWidget):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.layout  = QVBoxLayout()
        self.layout.addWidget(TopContentBlock(self))
        self.layout.addWidget(BottomContentBlock(self))
        self.setLayout(self.layout)
        self.layout.setContentsMargins(0,0,0,0)
        self.layout.setSpacing(0)
#        self.layout.addStretch(1)
        self.setMinimumSize(640,400)                         # 400
        self.setWindowFlags(Qt.FramelessWindowHint)
#?        self.pressing = False


class TopContentBlock(QWidget):
    def __init__(self, parent):
        super(TopContentBlock, self).__init__();
#?        self.parent = parent;
        self.layout = QVBoxLayout()
        self.layout.setContentsMargins(0, 0, 0, 0)

#        self.content = QWidget()                            # --- <---
        self.setFixedSize(640, 200)                          # --- .content              
        self.setStyleSheet("""                               
         background-color: #67BEC3;
        """)                                                 # --- .content 

        self.img = QLabel()
        self.img.setAlignment(Qt.AlignCenter)                # +++

        pixmap = QPixmap('im.png')                           #('main_illustration.png')
#        self.img.setPixmap(pixmap)
        self.img.setPixmap(pixmap.scaled(200, 200,           # +++
                                         Qt.IgnoreAspectRatio, 
                                         Qt.FastTransformation))
#        self.img.resize(pixmap.width(), pixmap.height())
        #self.img.setFixedSize(pixmap.width(), pixmap.height())

        self.layout.addWidget(self.img)
#        self.layout.addWidget(self.content)                 # ---
        self.layout.setSpacing(0)                            # +++
        self.setLayout(self.layout)


class BottomContentBlock(QWidget):
    def __init__(self, parent):
        super(BottomContentBlock, self).__init__();
        self.parent = parent;
        self.layout = QVBoxLayout()
        self.layout.setContentsMargins(0, 0, 0, 0)

        self.content = QWidget()
        self.content.setFixedSize(640, 200)               #(640, 400)
        self.content.setStyleSheet("""
            background-color: cyan;
        """)
        self.layout.addWidget(self.content)
        self.setLayout(self.layout)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    mw = MainWindow()
    mw.show()
    sys.exit(app.exec_())