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开发之str.format()用法实例分析
Feb 22 Python
django之常用命令详解
Jun 30 Python
Python 递归函数详解及实例
Dec 27 Python
python3爬取各类天气信息
Feb 24 Python
火车票抢票python代码公开揭秘!
Mar 08 Python
PYTHON基础-时间日期处理小结
May 05 Python
Python中使用Counter进行字典创建以及key数量统计的方法
Jul 06 Python
详解Python odoo中嵌入html简单的分页功能
May 29 Python
django 使用全局搜索功能的实例详解
Jul 18 Python
如何利用python给图片添加半透明水印
Sep 06 Python
详解pytorch中squeeze()和unsqueeze()函数介绍
Sep 03 Python
详解非极大值抑制算法之Python实现
Jun 28 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
blinker(1) 定时任务(2) 计时器(1) MYSQL函数(1) turtle(1) 绘图(1) mysql.user(1) 三子棋(2) Mysql报错(1) 信号库(1)
You might like
php 向访客和爬虫显示不同的内容
2009/11/09 PHP
destoon实现首页显示供应、企业、资讯条数的方法
2014/07/15 PHP
PHP命令行脚本接收传入参数的三种方式
2014/08/20 PHP
php实现在服务器端调整图片大小的方法
2015/06/16 PHP
PHP 信号管理知识整理汇总
2017/02/19 PHP
javascript 中对象的继承〔转贴〕
2007/01/22 Javascript
体验js中splice()的强大(插入、删除或替换数组的元素)
2013/01/16 Javascript
jQuery 获取URL的GET参数值的小例子
2013/04/18 Javascript
javascript检查浏览器是否已经启用XX功能
2015/07/10 Javascript
Javascript简单实现面向对象编程继承实例代码
2015/11/27 Javascript
整理Javascript基础语法学习笔记
2015/11/29 Javascript
Javascript的表单验证-提交表单
2016/03/18 Javascript
HTML5 canvas 9绘制图片实例详解
2016/09/06 Javascript
微信小程序 限制1M的瘦身技巧与方法详解
2017/01/06 Javascript
jQuery+ajax实现局部刷新的两种方法
2017/06/08 jQuery
修改Nodejs内置的npm默认配置路径方法
2018/05/13 NodeJs
vue-cli3.0使用及部分配置详解
2018/08/29 Javascript
如何通过vscode运行调试javascript代码
2020/07/24 Javascript
[15:20]DOTA2亚洲邀请赛总决赛开幕式表演：羽泉献唱
2017/04/05 DOTA
Python读写Excel文件的实例
2013/11/01 Python
用Python制作简单的朴素基数估计器的教程
2015/04/01 Python
Python Sql数据库增删改查操作简单封装
2016/04/18 Python
Python爬虫实现获取动态gif格式搞笑图片的方法示例
2018/12/24 Python
python3.7 openpyxl 在excel单元格中写入数据实例
2020/09/01 Python
python与js主要区别点总结
2020/09/13 Python
python 牛顿法实现逻辑回归（Logistic Regression）
2020/10/15 Python
SEPHORA丝芙兰德国官方购物网站：化妆品、护肤品和香水
2020/01/21 全球购物
C#如何调用Word并打开一个Word文档
2013/05/08 面试题
如何从一个文件档案的尾端新增记录
2016/12/02 面试题
Set里的元素是不能重复的，那么用什么方法来区分重复与否呢？ 是用==还是equals()？ 它们有何区别？
2014/07/27 面试题
优质的学校老师推荐信
2013/10/28 职场文书
实习协议书范本
2014/09/25 职场文书
婚前协议书范本
2014/10/27 职场文书
商铺租房协议书范本
2014/12/04 职场文书
监守自盗观后感
2015/06/10 职场文书
银行安全保卫工作总结
2015/08/10 职场文书