Add 03-12-03-06

QFileDialog-信号

Author: muziing

03-QtWidgets-常用控件/12-Dialog-对话框/03-QFileDialog-文件对话框/06-QFileDialog-信号.py

@@ -0,0 +1,72 @@
+import sys
+from pprint import pprint
+
+from PySide6 import QtWidgets
+
+"""
+QFileDialog 信号
+
+currentChanged(path: str)               当前选择改变时发射此信号，新选择的项作为参数传递
+currentUrlChanged(url: QUrl)            当前选中的Url改变时发射此信号，新的Url作为参数传递
+directoryEntered(directory: str)        进入目录时发射此信号，目录作为参数传递
+directoryUrlEntered(directory: QUrl)    进入目录时发射此信号，目录的URL作为参数传递
+fileSelected(file: str)                 选择了文件，并以Accept退出对话框时，发射此信号
+filesSelected(selected: List[str])      选择了（多个）文件时发射此信号
+filterSelected(filter_: str)             选中过滤器时发射此信号，过滤器作为参数传出
+urlSelected(url: QUrl)                  选择了文件，并以Accept退出对话框时，发射此信号
+urlsSelected(urls: List[QUrl])          选择了（多个）文件时发射此信号
+"""
+
+
+class MyWidget(QtWidgets.QWidget):
+    def __init__(self, *args, **kwargs):
+        super(MyWidget, self).__init__(*args, **kwargs)
+
+        self.dialog = QtWidgets.QFileDialog(self)  # 文件对话框
+        self.info_le = QtWidgets.QLineEdit(self)  # 用于显示最终选择
+        self.info_label = QtWidgets.QLabel(self)  # 用于显示当前选择
+
+        self.setup_dialog()
+        self.setup_ui()
+        self.test_signals()
+
+    def test_signals(self) -> None:
+        """测试QFileDialog信号功能"""
+        self.dialog.fileSelected.connect(lambda path: self.info_le.setText(path))  # type: ignore
+        self.dialog.currentChanged.connect(lambda path: self.info_label.setText(path))  # type: ignore
+        self.dialog.filesSelected.connect(lambda files: pprint(f"filesSelected: {files}"))  # type: ignore
+        self.dialog.directoryEntered.connect(lambda dir_: print(f"directoryEntered: {dir_}"))  # type: ignore
+        self.dialog.filterSelected.connect(lambda filter_: print(f"filterSelected: {filter_}"))  # type: ignore
+
+    def setup_dialog(self) -> None:
+        """设置文件对话框"""
+
+        self.dialog.setAcceptMode(QtWidgets.QFileDialog.AcceptOpen)
+        self.dialog.setFileMode(QtWidgets.QFileDialog.ExistingFiles)
+        self.dialog.setNameFilters(
+            ("Python files (*.py)", "Markdown files (*.md)", "Any files (*)")
+        )
+
+    def setup_ui(self) -> None:
+        """设置界面"""
+
+        self.setWindowTitle("QFileDialog-信号")
+
+        # 配置其他控件
+        self.info_le.setMinimumWidth(600)
+        browse_btn = QtWidgets.QPushButton("打开文件", self)
+        browse_btn.clicked.connect(self.dialog.open)  # type: ignore
+
+        # 使用布局管理器布局
+        layout = QtWidgets.QVBoxLayout(self)
+        layout.addWidget(browse_btn)
+        layout.addWidget(self.info_le)
+        layout.addWidget(self.info_label)
+        self.setLayout(layout)
+
+
+if __name__ == "__main__":
+    app = QtWidgets.QApplication(sys.argv)
+    window = MyWidget()
+    window.show()
+    sys.exit(app.exec())