Drag and Drop
---------------

.. code-block:: python
    :caption: scripts/PYQT5/01_customize_widget/03_drag_and_drop/main.py

    # -*- coding: utf-8 -*-

    import sys
    import codecs
    from PyQt5.QtWidgets import QApplication, QLabel, QVBoxLayout, QWidget
    from PyQt5.QtGui import QPixmap
    from PyQt5.QtCore import Qt
    @@ -12,13 +13,15 @@ def __init__(self):
            self.label = QLabel(self)
            self.label.setText("Drag & Drop an Image or Text here!")
            self.label.setAlignment(Qt.AlignCenter)
            self.label.setWordWrap(True)

            layout = QVBoxLayout()
            layout.addWidget(self.label)

            self.setLayout(layout)

            self.setAcceptDrops(True)
            self.setMinimumSize(300, 200)

        def dragEnterEvent(self, event):
            mime = event.mimeData()
            if mime.hasUrls():  # 파일 URL이 있는지 확인
                # 첫 번째 URL만 사용 (다중 파일 선택을 지원하지 않음)
                file_url = mime.urls()[0]
                pixmap = QPixmap(file_url.toLocalFile())  # 파일 경로로 QPixmap 로드
                self.label.setFixedSize(pixmap.size())  # 라벨의 크기를 QPixmap의 크기에 맞게 조정
                self.label.setPixmap(pixmap)
                self.setFixedSize(pixmap.size())  # 메인 윈도우의 크기를 QPixmap의 크기에 맞게 조정
                file_url = mime.urls()[0].toLocalFile()
                if file_url.endswith('.txt'):
                    with codecs.open(file_url, 'r', encoding='utf-8') as file:
                        content = file.read()
                    self.label.setText(content)
                    self.label.adjustSize()
                    self.resize(self.label.width(), self.label.height() + 50)
                else:
                    pixmap = QPixmap(file_url)
                    self.label.setPixmap(pixmap)
                    self.label.setFixedSize(pixmap.size())
                    self.setFixedSize(pixmap.size())
            elif mime.hasText():
                self.label.setText(mime.text())
                self.label.adjustSize()  # 라벨 크기를 텍스트 크기에 맞게 조절
                self.resize(self.label.width(), self.label.height() + 50)

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


In this example, functionality has been implemented to display content on the widget when the user drag-and-drops a text or image file onto the widget.

- ``setAcceptDrops(True)``: This setting enables the widget to accept drag and drop actions.

- ``dragEnterEvent``: Handles the event to accept if the dragged data is either text or an image.

- ``dropEvent``: Displays the dragged data on the label. For image files, it loads the image using a ``QPixmap`` object and adjusts the size of the label and the main window to the image size. For text, it directly displays the dragged text on the label.