首页
所有分类
TAGS
文字工具 EMOJI BIBLE
编程 Python

python3+PyQt5重新实现自定义数据拖放处理

Posted in Python onApril 19, 2018

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()
   stream>>self.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：

python3+PyQt5重新实现自定义数据拖放处理

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()
   stream>>icon
   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()
   stream>>icon
   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()
   stream>>self.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：

python3+PyQt5重新实现自定义数据拖放处理

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三水点靠木。

python3+PyQt5重新实现自定义数据拖放处理

- Author -

basisworker

声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。

Python 相关文章推荐
Python cookbook（数据结构与算法）从任意长度的可迭代对象中分解元素操作示例
Feb 13 Python
python实现隐马尔科夫模型HMM
Mar 25 Python
python 中字典嵌套列表的方法
Jul 03 Python
python版本单链表实现代码
Sep 28 Python
详解如何在Apache中运行Python WSGI应用
Jan 02 Python
Django 1.10以上版本 url 配置注意事项详解
Aug 05 Python
tensorflow如何批量读取图片
Aug 29 Python
原来我一直安装 Python 库的姿势都不对呀
Nov 11 Python
tensorflow 报错unitialized value的解决方法
Feb 06 Python
Python greenlet和gevent使用代码示例解析
Apr 01 Python
Win10下用Anaconda安装TensorFlow(图文教程)
Jun 18 Python
Python使用grequests并发发送请求的示例
Nov 05 Python
python之从文件读取数据到list的实例讲解
Apr 19 #Python
python实现读取大文件并逐行写入另外一个文件
Apr 19 #Python
python按行读取文件,去掉每行的换行符\n的实例
Apr 19 #Python
PyQt5每天必学之拖放事件
Aug 27 #Python
sublime python3 输入换行不结束的方法
Apr 19 #Python
PyQt5每天必学之像素图控件QPixmap
Apr 19 #Python
PyQt5每天必学之单行文本框
Apr 19 #Python
ICOM(2) DE1107(3) R72E(1) React(6) R71E(1) 对讲机(1) WR-800F(1) R9700(1) 胆机(1) DE1102(1)
You might like
ThinkPHP使用UTFWry地址库进行IP定位实例
2014/04/01 PHP
Laravel 5框架学习之Eloquent （laravel 的ORM）
2015/04/08 PHP
php封装json通信接口详解及实例
2017/03/07 PHP
laravel框架中表单请求类型和CSRF防护实例分析
2019/11/23 PHP
用jquery ajax获取网站Alexa排名的代码
2009/12/12 Javascript
基于jQuery的消息提示插件之旅 DivAlert(三)
2010/04/01 Javascript
高性能WEB开发 flush让页面分块,逐步呈现 flush让页面分块,逐步呈现
2010/06/19 Javascript
javascript:history.go()和History.back()的区别及应用
2012/11/25 Javascript
js的hasownproperty使用示例
2014/03/02 Javascript
jQuery实现输入框下拉列表树插件特效代码分享
2015/08/27 Javascript
javascript实现消灭星星小游戏简单版
2016/11/15 Javascript
jQuery Validate让普通按钮触发表单验证的方法
2016/12/15 Javascript
代码详解Vuejs响应式原理
2017/12/20 Javascript
在 React、Vue项目中使用SVG的方法
2018/02/09 Javascript
jQuery简单判断值是否存在于数组中的方法示例
2018/04/17 jQuery
基于vue展开收起动画的示例代码
2018/07/05 Javascript
jQuery实现购物车的总价计算和总价传值功能
2018/11/28 jQuery
vue源码中的检测方法的实现
2019/09/26 Javascript
[06:21]完美世界亚洲区首席发行官竺琦TI3采访
2013/08/26 DOTA
python生成词云的实现方法(推荐)
2017/06/13 Python
Python学习之Anaconda的使用与配置方法
2018/01/04 Python
Tensorflow实现将标签变为one-hot形式
2020/05/22 Python
Python日志打印里logging.getLogger源码分析详解
2021/01/17 Python
Html5大文件断点续传实现方法
2015/12/05 HTML / CSS
Clarks鞋澳大利亚官方网站：Clarks Australia
2019/12/25 全球购物
英国100％防污和防水的靴子：Muck Boot Company
2020/09/08 全球购物
介绍一下Linux内核的排队自旋锁
2014/01/04 面试题
初三政治教学反思
2014/01/30 职场文书
运动会通讯稿300字
2014/02/02 职场文书
户外活动总结范文
2014/04/30 职场文书
2014年教师节红领巾广播稿
2014/09/10 职场文书
2014年行政部工作总结
2014/11/19 职场文书
闪闪红星观后感
2015/06/08 职场文书
总结一些Java常用的加密算法
2021/06/11 Java/Android
springboot 启动如何排除某些bean的注入
2021/08/02 Java/Android
MySQL创建管理子分区
2022/04/13 MySQL