我想讓用戶通過將項目從 PyQt 拖到系統文件資源管理器來創建文件。由于某些文件非常大，我還需要延遲將數據設置為用戶完成放置時，而不是立即開始拖動。這個例子似乎是我需要的：https://doc.qt.io/archives/4.6/draganddrop-delayedencoding.html我嘗試將其轉換為簡單的 PyQt5 版本，其中將 QPushButton 拖動到文件夾中將創建一個純文本文件，但它對我不起作用...當我運行它時，刪除不會執行任何操作，我的光標如下所示：import sysfrom PyQt5 import QtCore, QtGui, QtWidgetsimport typingimport timeclass MimeData(QtCore.QMimeData): dataRequested = QtCore.pyqtSignal(str) def formats(self) -> typing.List[str]: return QtCore.QMimeData.formats(self) + ["text/plain"] def retrieveData(self, mime_type: str, preferred_type: QtCore.QVariant.Type): self.dataRequested.emit(mime_type) return QtCore.QMimeData.retrieveData(self, mime_type, preferred_type)class SourceWidget(QtWidgets.QWidget): mimeData: MimeData = None def __init__(self, parent=None): super().__init__(parent) layout = QtWidgets.QVBoxLayout() button = QtWidgets.QPushButton("Drag Me") button.pressed.connect(self.start_drag) layout.addWidget(button) self.setLayout(layout) @QtCore.pyqtSlot() def create_data(self, mime_type): if mime_type == "text/plain": time.sleep(0.25) # Simulate large file self.mimeData.setData("text/plain", b"my text file contents") @QtCore.pyqtSlot() def start_drag(self): self.mimeData = MimeData() self.mimeData.dataRequested.connect(self.create_data) drag = QtGui.QDrag(self) drag.setMimeData(self.mimeData) drag.exec(QtCore.Qt.CopyAction)if __name__ == "__main__": app = QtWidgets.QApplication.instance() or QtWidgets.QApplication(sys.argv) w = SourceWidget() w.show() app.exec_()
1 回答
慕的地8271018
TA貢獻1796條經驗 獲得超4個贊
這是我最終將文件從 PyQt5 拖放到文件資源管理器中的結果，并且只有在釋放鼠標以完成放置時才寫入文件。
import time
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import Qt
import tempfile
import os
# Use win32api on Windows because the pynput and mouse packages cause lag
# https://github.com/moses-palmer/pynput/issues/390
if os.name == 'nt':
import win32api
def mouse_pressed():
return win32api.GetKeyState(0x01) not in [0, 1]
else:
import mouse
def mouse_pressed():
return mouse.is_pressed()
class DelayedMimeData(QtCore.QMimeData):
def __init__(self):
super().__init__()
self.callbacks = []
def add_callback(self, callback):
self.callbacks.append(callback)
def retrieveData(self, mime_type: str, preferred_type: QtCore.QVariant.Type):
mp = mouse_pressed()
if not mp:
for callback in self.callbacks.copy():
self.callbacks.remove(callback)
callback()
return QtCore.QMimeData.retrieveData(self, mime_type, preferred_type)
class Navigator(QtWidgets.QTreeWidget):
def __init__(self):
super().__init__()
self.setHeaderLabels(["Name"])
QtWidgets.QTreeWidgetItem(self, ['Test1'])
QtWidgets.QTreeWidgetItem(self, ['Test2'])
QtWidgets.QTreeWidgetItem(self, ['Test3'])
self.setAcceptDrops(True)
self.setDragEnabled(True)
self.setDragDropMode(self.DragDrop)
self.setDefaultDropAction(Qt.MoveAction)
self.setSelectionMode(self.ExtendedSelection)
self.setSelectionBehavior(self.SelectRows)
self.setContextMenuPolicy(Qt.CustomContextMenu)
def startDrag(self, actions):
drag = QtGui.QDrag(self)
names = [item.text(0) for item in self.selectedItems()]
mime = DelayedMimeData()
path_list = []
for name in names:
path = os.path.join(tempfile.gettempdir(), 'DragTest', name + '.txt')
os.makedirs(os.path.dirname(path), exist_ok=True)
print(path)
def write_to_file(path=path, name=name, widget=self):
with open(path, 'w+') as f:
print("Writing large file(s)...")
time.sleep(2) # Sleep to simulate long file write
f.write(f"Contents of {name}")
mime.add_callback(write_to_file)
path_list.append(QtCore.QUrl.fromLocalFile(path))
mime.setUrls(path_list)
mime.setData('application/x-qabstractitemmodeldatalist',
self.mimeData(self.selectedItems()).data('application/x-qabstractitemmodeldatalist'))
drag.setMimeData(mime)
drag.exec_(Qt.MoveAction)
super().startDrag(actions)
app = QtWidgets.QApplication([])
nav = Navigator()
nav.show()
app.exec_()
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