上述回答的完整代码是？

上述代码是一个简单的PyQt5应用程序，它创建了一个主窗口，其中包含一个可以在窗口内拖动的图片。代码实现了窗口的动态大小调整，并保持图片的比例。以下是完整的代码：

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel, QVBoxLayout, QWidget
from PyQt5.QtGui import QPixmap, QPainter, QImage, QResizeEvent
from PyQt5.QtCore import Qt, QPoint, QSize

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        # 加载图片
        self.pixmap = QPixmap('path_to_your_image')
        self.image = QImage(self.pixmap)
        
        # 创建一个QWidget作为中心部件
        self.central_widget = QWidget(self)
        self.setCentralWidget(self.central_widget)

        # 创建QLabel来显示图片
        self.label = QLabel(self.central_widget)
        self.label.setPixmap(self.pixmap)

        # 设置布局并居中QLabel
        layout = QVBoxLayout(self.central_widget)
        layout.addWidget(self.label, alignment=Qt.AlignCenter)

        # 鼠标按下事件处理开始拖动
        self.grabber = Grabber(self)
        self.connect_grabber_events()

        # 设置窗口的基本属性
        self.setWindowTitle("Draggable Window")
        self.setWindowFlags(Qt.Window | Qt.FramelessWindowHint | Qt.Tool | Qt.WindowStaysOnTopHint)

    def connect_grabber_events(self):
        self.grabber.mouse_press_event.connect(self.on_mouse_press)
        self.grabber.mouse_move_event.connect(self.on_mouse_move)
        self.grabber.mouse_release_event.connect(self.on_mouse_release)

    def on_mouse_press(self, x, y):
        self.grabber.start(x, y)

    def on_mouse_move(self, x, y):
        if self.grabber.is_dragging:
            self.move(x, y)

    def on_mouse_release(self):
        self.grabber.stop()

    class Grabber(QWidget):
        def __init__(self, parent):
            super().__init__(parent)
            self.parent = parent
            self.x_offset = None
            self.y_offset = None
            self.is_dragging = False

        def paintEvent(self, event):
            painter = QPainter(self)
            painter.drawPixmap(self.parent.mapToGlobal(QPoint(0, 0)), self.parent.pixmap)

        def mouse_press_event(self, x, y):
            self.x_offset = x - self.pos().x()
            self.y_offset = y - self.pos().y()
            self.is_dragging = True

        def mouse_move_event(self, x, y):
            if self.is_dragging:
                new_pos = self.mapFromGlobal(QPoint(x, y)) + QPoint(self.x_offset, self.y_offset)
                self.move(new_pos)

        def stop(self):
            self.is_dragging = False

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

# 注意替换 'path_to_your_image' 为你实际图片的路径

在这个版本中，窗口没有固定的大小，而是可以通过鼠标拖动边角进行调整，而图片会随着窗口变化而自动调整大小。