Qt第六十三章：文件拖动上传

目录

一、目标：文件拖动到指定区域上传文件

二、实现

三、指定区域：只需将上一步的DragWidget加入应用的布局中即可

四、稍稍复杂一点的：带删除按钮和右键菜单

---

一、目标：文件拖动到指定区域上传文件

二、实现

from PySide6.QtWidgets import QWidget, QFileDialog, QApplication


class DragWidget(QWidget):
    def __init__(self, parent=None):
        super(DragWidget, self).__init__(parent)
        # 设置允许该区域接收拖放事件
        self.setAcceptDrops(True)

    def dragEnterEvent(self, event):
        # 获取拖放的文件列表
        files = event.mimeData().urls()
        # 如果文件列表非空，则接收拖放事件
        if files:
            event.accept()
        else:
            event.ignore()

    def dropEvent(self, event):
        files = event.mimeData().urls()
        for file in files:
            # 拖入的文件路径
            file_path = file.toLocalFile()
            print(file_path)
            # 利用这个路径，我们可以打开文件选择框，并定位到刚刚拖入的文件
            upload_path, _ = QFileDialog.getSaveFileName(self, "Upload", file_path)
            # 将文件上传到指定路径


if __name__ == '__main__':
    app = QApplication([])
    window = DragWidget()
    window.show()
    app.exec()

三、指定区域：只需将上一步的DragWidget加入应用的布局中即可

四、稍稍复杂一点的：带删除按钮和右键菜单

from PySide6.QtCore import QPoint, Qt
from PySide6.QtWidgets import QWidget, QFileDialog, QApplication, QListWidget, QVBoxLayout, QListWidgetItem, \
    QPushButton, QHBoxLayout, QLabel, QMenu, QAbstractItemView
from functools import partial


class DragWidget(QWidget):
    def __init__(self, parent=None):
        super(DragWidget, self).__init__(parent)
        # 设置允许该区域接收拖放事件
        self.setAcceptDrops(True)
        self.paths = []
        self.layout = QVBoxLayout()
        self.setLayout(self.layout)
        self.list_widget = QListWidget()
        # 设置列表允许多选
        self.list_widget.setSelectionMode(QAbstractItemView.SelectionMode.ExtendedSelection)
        self.layout.addWidget(self.list_widget)

    def render_list_widget(self):
        self.list_widget.clear()
        for idx, item in enumerate(self.paths):
            # 创建QListWidgetItem实例
            list_item = QListWidgetItem()


            widget = QWidget()
            row_layout = QHBoxLayout()
            widget.setLayout(row_layout)
            label = QLabel(item)
            # 在QListWidgetItem上设置ContextMenuPolicy属性为Qt.CustomContextMenu
            label.setContextMenuPolicy(Qt.CustomContextMenu)
            # 将list_item与右键菜单signal customContextMenuRequested连接
            label.customContextMenuRequested.connect(self.show_menu)

            button = QPushButton('X')
            button.clicked.connect(partial(self.on_btn_clicked, list_item))

            button.setFixedSize(20, 20)
            button.setStyleSheet("background-color: red; color: white;")
            row_layout.addWidget(label)
            row_layout.addWidget(button)
            row_layout.setContentsMargins(0, 0, 1, 1)  # 去掉边距

            list_item.setSizeHint(row_layout.sizeHint())
            self.list_widget.addItem(list_item)
            self.list_widget.setItemWidget(list_item, widget)

    def on_btn_clicked(self, list_item):
        """
        处理按钮的信号槽函数
        """
        row = self.list_widget.row(list_item)
        self.list_widget.takeItem(row)
        del self.paths[row]

    def show_menu(self, widget):
        # 创建右键菜单
        menu = QMenu()
        # 添加删除项目的选项
        delete_action = menu.addAction("删除")
        # 如果是删除按钮的右键菜单，则获取对应的 QListWidgetItem 实例
        if isinstance(widget, QPushButton):
            list_item = widget.parent().parent()
        else:
            list_item = self.list_widget.currentItem()
        # 如果当前有选中的项目，则在右键菜单中显示删除选项
        if list_item is not None:
            action = menu.exec_(self.list_widget.mapToGlobal(widget))
            if action == delete_action:
                # 获取选中项目的列表
                selected_items = self.list_widget.selectedItems()
                for item in selected_items:
                    # 获取项目所在行号
                    row = self.list_widget.row(item)
                    # 从QListWidget控件中删除行
                    self.list_widget.takeItem(row)
                    del self.paths[row]

    def dragEnterEvent(self, event):
        # 获取拖放的文件列表
        files = event.mimeData().urls()
        # 如果文件列表非空，则接收拖放事件
        if files:
            event.accept()
        else:
            event.ignore()

    def dropEvent(self, event):
        files = event.mimeData().urls()
        for file in files:
            # 拖入的文件路径
            file_path = file.toLocalFile()
            self.paths.append(file_path)
            self.render_list_widget()


if __name__ == '__main__':
    app = QApplication([])
    window = DragWidget()
    window.show()
    app.exec()