DDR爱好者之家 Design By 杰米
本文分成两部分，第一部分通过python3+PyQt5实现自定义数据的拖放操作。第二部分则对第一部分的程序进行修改，增加拖放操作时，菜单提示是否移动或拷贝，还有可以通过ctrl键盘来设置移动过程中拷贝源而非会将源删除。
自定义数据MIME数据类型QMimeData，MIME是一种用于处理具有多个组成部分的自定义数据的标准化格式。MIME数据由一个数据类型和一个子类型构成–例如，text/plain，text/html，image/png，要处理自定义MIME数据，就必须要选用一种自定义数据类型和一种子类型，然后将数据封装到QMimeData对象中。本例子中，我们创建端为application/x-icon-and-text类型的新MIME数据。
注：
dragEnterEvent这是一个拖拽事件的函数，我们把文件拖拽进程序界面打开，之前必须setAcceptDrops(true)了以后拖拽，但是只设置acceptDrops还不够，还需要在dragEnterEvent事件中对拖入的对象进行筛选，判断mimeData的类型是否是你能处理的，如果是，则调用event.acceptProposedAction()放行。拖放结束后会产生dropEvent事件，在那里进行最后的放置操作。总之这是拖拽事件函数的一个筛选事件并放置的函数。
第一部分：
#!/usr/bin/env python3
import os
import sys
from PyQt5.QtCore import (QByteArray, QDataStream, QIODevice, QMimeData,
QPoint, QSize, Qt)
from PyQt5.QtWidgets import (QApplication, QDialog,QGridLayout,
QLineEdit, QListWidget,QListWidgetItem, QWidget)
from PyQt5.QtGui import QIcon,QColor,QPainter,QFontMetricsF,QDrag
class DropLineEdit(QLineEdit):
def __init__(self, parent=None):
super(DropLineEdit, self).__init__(parent)
self.setAcceptDrops(True)
def dragEnterEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.accept()
else:
event.ignore()
def dragMoveEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.setDropAction(Qt.CopyAction)
event.accept()
else:
event.ignore()
def dropEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
data = event.mimeData().data("application/x-icon-and-text")
stream = QDataStream(data, QIODevice.ReadOnly)
text = ""
#stream text
text=stream.readQString()
self.setText(text)
event.setDropAction(Qt.CopyAction)
event.accept()
else:
event.ignore()
class DnDListWidget(QListWidget):
def __init__(self, parent=None):
super(DnDListWidget, self).__init__(parent)
self.setAcceptDrops(True)
self.setDragEnabled(True)
def dragEnterEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.accept()
else:
event.ignore()
def dragMoveEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.setDropAction(Qt.MoveAction)
event.accept()
else:
event.ignore()
def dropEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
data = event.mimeData().data("application/x-icon-and-text")
stream = QDataStream(data, QIODevice.ReadOnly)
text = ""
icon = QIcon()
#stream text icon
text=stream.readQString()
stream icon
item = QListWidgetItem(text, self)
item.setIcon(icon)
event.setDropAction(Qt.MoveAction)
event.accept()
else:
event.ignore()
def startDrag(self, dropActions):
item = self.currentItem()
icon = item.icon()
data = QByteArray()
stream = QDataStream(data, QIODevice.WriteOnly)
#stream << item.text() << icon
stream.writeQString(item.text())
stream << icon
mimeData = QMimeData()
mimeData.setData("application/x-icon-and-text", data)
drag = QDrag(self)
drag.setMimeData(mimeData)
pixmap = icon.pixmap(24, 24)
drag.setHotSpot(QPoint(12, 12))
drag.setPixmap(pixmap)
if drag.exec(Qt.MoveAction) == Qt.MoveAction:
self.takeItem(self.row(item))
class DnDWidget(QWidget):
def __init__(self, text, icon=QIcon(), parent=None):
super(DnDWidget, self).__init__(parent)
self.setAcceptDrops(True)
self.text = text
self.icon = icon
def minimumSizeHint(self):
fm = QFontMetricsF(self.font())
if self.icon.isNull():
return QSize(fm.width(self.text), fm.height() * 1.5)
return QSize(34 + fm.width(self.text), max(34, fm.height() * 1.5))
def paintEvent(self, event):
height = QFontMetricsF(self.font()).height()
painter = QPainter(self)
painter.setRenderHint(QPainter.Antialiasing)
painter.setRenderHint(QPainter.TextAntialiasing)
painter.fillRect(self.rect(), QColor(Qt.yellow).lighter())
if self.icon.isNull():
painter.drawText(10, height, self.text)
else:
pixmap = self.icon.pixmap(24, 24)
painter.drawPixmap(0, 5, pixmap)
painter.drawText(34, height,
self.text + " (Drag to or from me!)")
def dragEnterEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.accept()
else:
event.ignore()
def dragMoveEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.setDropAction(Qt.CopyAction)
event.accept()
else:
event.ignore()
def dropEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
data = event.mimeData().data("application/x-icon-and-text")
stream = QDataStream(data, QIODevice.ReadOnly)
self.text = ""
self.icon = QIcon()
#stream self.text self.icon
self.text=stream.readQString()
streamself.icon
event.setDropAction(Qt.CopyAction)
event.accept()
self.updateGeometry()
self.update()
else:
event.ignore()
def mouseMoveEvent(self, event):
self.startDrag()
QWidget.mouseMoveEvent(self, event)
def startDrag(self):
icon = self.icon
if icon.isNull():
return
data = QByteArray()
stream = QDataStream(data, QIODevice.WriteOnly)
#stream << self.text << icon
stream.writeQString(self.text)
stream<<icon
mimeData = QMimeData()
mimeData.setData("application/x-icon-and-text", data)
drag = QDrag(self)
drag.setMimeData(mimeData)
pixmap = icon.pixmap(24, 24)
drag.setHotSpot(QPoint(12, 12))
drag.setPixmap(pixmap)
drag.exec(Qt.CopyAction)
class Form(QDialog):
def __init__(self, parent=None):
super(Form, self).__init__(parent)
dndListWidget = DnDListWidget()
path = os.path.dirname(__file__)
for image in sorted(os.listdir(os.path.join(path, "images"))):
if image.endswith(".png"):
item = QListWidgetItem(image.split(".")[0].capitalize())
item.setIcon(QIcon(os.path.join(path,
"images/{0}".format(image))))
dndListWidget.addItem(item)
dndIconListWidget = DnDListWidget()
dndIconListWidget.setViewMode(QListWidget.IconMode)
dndWidget = DnDWidget("Drag to me!")
dropLineEdit = DropLineEdit()
layout = QGridLayout()
layout.addWidget(dndListWidget, 0, 0)
layout.addWidget(dndIconListWidget, 0, 1)
layout.addWidget(dndWidget, 1, 0)
layout.addWidget(dropLineEdit, 1, 1)
self.setLayout(layout)
self.setWindowTitle("Custom Drag and Drop")
if __name__ == "__main__":
app = QApplication(sys.argv)
form = Form()
form.show()
app.exec_()
运行结果：
第二部分：
#!/usr/bin/env python3
import os
import sys
from PyQt5.QtCore import (QByteArray, QDataStream, QIODevice, QMimeData,
QPoint, QSize, Qt)
from PyQt5.QtWidgets import (QApplication, QDialog,QGridLayout,
QLineEdit, QListWidget,QListWidgetItem, QWidget,QMenu)
from PyQt5.QtGui import QIcon,QColor,QPainter,QFontMetricsF,QDrag,QCursor
class DropLineEdit(QLineEdit):
def __init__(self, parent=None):
super(DropLineEdit, self).__init__(parent)
self.setAcceptDrops(True)
def dragEnterEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.accept()
else:
event.ignore()
def dragMoveEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.setDropAction(Qt.CopyAction)
event.accept()
else:
event.ignore()
def dropEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
data = event.mimeData().data("application/x-icon-and-text")
stream = QDataStream(data, QIODevice.ReadOnly)
text = ""
text=stream.readQString()
self.setText(text)
event.setDropAction(Qt.CopyAction)
event.accept()
else:
event.ignore()
class DnDMenuListWidget(QListWidget):
def __init__(self, parent=None):
super(DnDMenuListWidget, self).__init__(parent)
self.setAcceptDrops(True)
self.setDragEnabled(True)
self.dropAction = Qt.CopyAction
def dragEnterEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.accept()
else:
event.ignore()
def dragMoveEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.setDropAction(Qt.MoveAction)
event.accept()
else:
event.ignore()
def dropEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
data = event.mimeData().data("application/x-icon-and-text")
stream = QDataStream(data, QIODevice.ReadOnly)
text = ""
icon = QIcon()
text=stream.readQString()
streamicon
menu = QMenu(self)
menu.addAction("&Copy", self.setCopyAction)
menu.addAction("&Move", self.setMoveAction)
if menu.exec_(QCursor.pos()):
item = QListWidgetItem(text, self)
item.setIcon(icon)
event.setDropAction(self.dropAction)
event.accept()
return
else:
event.setDropAction(Qt.IgnoreAction)
event.ignore()
def setCopyAction(self):
self.dropAction = Qt.CopyAction
def setMoveAction(self):
self.dropAction = Qt.MoveAction
def startDrag(self, dropActions):
item = self.currentItem()
icon = item.icon()
data = QByteArray()
stream = QDataStream(data, QIODevice.WriteOnly)
stream.writeQString(item.text())
stream<<icon
mimeData = QMimeData()
mimeData.setData("application/x-icon-and-text", data)
drag = QDrag(self)
drag.setMimeData(mimeData)
pixmap = icon.pixmap(24, 24)
drag.setHotSpot(QPoint(12, 12))
drag.setPixmap(pixmap)
if (drag.exec(Qt.MoveAction|Qt.CopyAction) == Qt.MoveAction):
self.takeItem(self.row(item))
class DnDCtrlListWidget(QListWidget):
def __init__(self, parent=None):
super(DnDCtrlListWidget, self).__init__(parent)
self.setAcceptDrops(True)
self.setDragEnabled(True)
def dragEnterEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.accept()
else:
event.ignore()
def dragMoveEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
action = Qt.MoveAction
if event.keyboardModifiers() & Qt.ControlModifier:
action = Qt.CopyAction
event.setDropAction(action)
event.accept()
else:
event.ignore()
def dropEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
data = event.mimeData().data("application/x-icon-and-text")
stream = QDataStream(data, QIODevice.ReadOnly)
text = ""
icon = QIcon()
text=stream.readQString()
streamicon
item = QListWidgetItem(text, self)
item.setIcon(icon)
action = Qt.MoveAction
if event.keyboardModifiers() & Qt.ControlModifier:
action = Qt.CopyAction
event.setDropAction(action)
event.accept()
else:
event.ignore()
def startDrag(self, dropActions):
item = self.currentItem()
icon = item.icon()
data = QByteArray()
stream = QDataStream(data, QIODevice.WriteOnly)
stream.writeQString(item.text())
stream<<icon
mimeData = QMimeData()
mimeData.setData("application/x-icon-and-text", data)
drag = QDrag(self)
drag.setMimeData(mimeData)
pixmap = icon.pixmap(24, 24)
drag.setHotSpot(QPoint(12, 12))
drag.setPixmap(pixmap)
if (drag.exec(Qt.MoveAction|Qt.CopyAction) == Qt.MoveAction):
self.takeItem(self.row(item))
class DnDWidget(QWidget):
def __init__(self, text, icon=QIcon(), parent=None):
super(DnDWidget, self).__init__(parent)
self.setAcceptDrops(True)
self.text = text
self.icon = icon
def minimumSizeHint(self):
fm = QFontMetricsF(self.font())
if self.icon.isNull():
return QSize(fm.width(self.text), fm.height() * 1.5)
return QSize(34 + fm.width(self.text), max(34, fm.height() * 1.5))
def paintEvent(self, event):
height = QFontMetricsF(self.font()).height()
painter = QPainter(self)
painter.setRenderHint(QPainter.Antialiasing)
painter.setRenderHint(QPainter.TextAntialiasing)
painter.fillRect(self.rect(), QColor(Qt.yellow).lighter())
if self.icon.isNull():
painter.drawText(10, height, self.text)
else:
pixmap = self.icon.pixmap(24, 24)
painter.drawPixmap(0, 5, pixmap)
painter.drawText(34, height,
self.text + " (Drag to or from me!)")
def dragEnterEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.accept()
else:
event.ignore()
def dragMoveEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
event.setDropAction(Qt.CopyAction)
event.accept()
else:
event.ignore()
def dropEvent(self, event):
if event.mimeData().hasFormat("application/x-icon-and-text"):
data = event.mimeData().data("application/x-icon-and-text")
stream = QDataStream(data, QIODevice.ReadOnly)
self.text = ""
self.icon = QIcon()
self.text=stream.readQString()
streamself.icon
event.setDropAction(Qt.CopyAction)
event.accept()
self.updateGeometry()
self.update()
else:
event.ignore()
def mouseMoveEvent(self, event):
self.startDrag()
QWidget.mouseMoveEvent(self, event)
def startDrag(self):
icon = self.icon
if icon.isNull():
return
data = QByteArray()
stream = QDataStream(data, QIODevice.WriteOnly)
stream.writeQString(self.text)
stream<<icon
mimeData = QMimeData()
mimeData.setData("application/x-icon-and-text", data)
drag = QDrag(self)
drag.setMimeData(mimeData)
pixmap = icon.pixmap(24, 24)
drag.setHotSpot(QPoint(12, 12))
drag.setPixmap(pixmap)
drag.exec(Qt.CopyAction)
class Form(QDialog):
def __init__(self, parent=None):
super(Form, self).__init__(parent)
dndListWidget = DnDMenuListWidget()
path = os.path.dirname(__file__)
for image in sorted(os.listdir(os.path.join(path, "images"))):
if image.endswith(".png"):
item = QListWidgetItem(image.split(".")[0].capitalize())
item.setIcon(QIcon(os.path.join(path,
"images/{0}".format(image))))
dndListWidget.addItem(item)
dndIconListWidget = DnDCtrlListWidget()
dndIconListWidget.setViewMode(QListWidget.IconMode)
dndWidget = DnDWidget("Drag to me!")
dropLineEdit = DropLineEdit()
layout = QGridLayout()
layout.addWidget(dndListWidget, 0, 0)
layout.addWidget(dndIconListWidget, 0, 1)
layout.addWidget(dndWidget, 1, 0)
layout.addWidget(dropLineEdit, 1, 1)
self.setLayout(layout)
self.setWindowTitle("Custom Drag and Drop")
if __name__ == "__main__":
app = QApplication(sys.argv)
form = Form()
form.show()
app.exec_()
运行结果：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
DDR爱好者之家 Design By 杰米
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DDR爱好者之家 Design By 杰米
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稳了！魔兽国服回归的3条重磅消息！官宣时间再确认！
昨天有一位朋友在大神群里分享，自己亚服账号被封号之后居然弹出了国服的封号信息对话框。
这里面让他访问的是一个国服的战网网址，com.cn和后面的zh都非常明白地表明这就是国服战网。
而他在复制这个网址并且进行登录之后，确实是网易的网址，也就是我们熟悉的停服之后国服发布的暴雪游戏产品运营到期开放退款的说明。这是一件比较奇怪的事情，因为以前都没有出现这样的情况，现在突然提示跳转到国服战网的网址，是不是说明了简体中文客户端已经开始进行更新了呢？
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