ZetCode PyQt4 tutorial Drag and Drop
#!/usr/bin/python
# -*- coding: utf-8 -*- """
ZetCode PyQt4 tutorial This is a simple drag and
drop example. author: Jan Bodnar
website: zetcode.com
last edited: January 2015
""" import sys
from PyQt4 import QtGui # In order to drop text on the QtGui.QPushButton widget, we must reimplement some methods. Therefore, we create our own Button class which inherits from the QtGui.QPushButton class.
class Button(QtGui.QPushButton): def __init__(self, title, parent):
super(Button, self).__init__(title, parent) # We enable drop events for the widget.
self.setAcceptDrops(True) # First, we reimplement the dragEnterEvent() method. We inform about the data type that we accept. In our case it is plain text.
def dragEnterEvent(self, e): if e.mimeData().hasFormat('text/plain'):
e.accept()
else:
e.ignore() # By reimplementing the dropEvent() method we define what we will do upon the drop event. Here we change the text of the button widget.
def dropEvent(self, e):
self.setText(e.mimeData().text()) class Example(QtGui.QWidget): def __init__(self):
super(Example, self).__init__() self.initUI() def initUI(self): edit = QtGui.QLineEdit('', self)
# The QtGui.QLineEdit widget has a built-in support for drag operations. All we need to do is to call setDragEnabled() method to activate it.
edit.setDragEnabled(True)
edit.move(30, 65) button = Button("Button", self)
button.move(190, 65) self.setWindowTitle('Simple drag & drop')
self.setGeometry(300, 300, 300, 150) def main(): app = QtGui.QApplication(sys.argv)
ex = Example()
ex.show()
app.exec_() if __name__ == '__main__':
main() -------------------------------------------------------------------------------- #!/usr/bin/python
# -*- coding: utf-8 -*- """
ZetCode PyQt4 tutorial In this program, we can press on a button
with a left mouse click or drag and drop the
button with the right mouse click. author: Jan Bodnar
website: zetcode.com
last edited: October 2013
""" import sys
from PyQt4 import QtCore, QtGui # We create a Button class which will derive from the QtGui.QPushButton. We also reimplement two methods of the QtGui.QPushButton: the mouseMoveEvent() and the mousePressEvent(). The mouseMoveEvent() method is the place where the drag & drop operation begins.
class Button(QtGui.QPushButton): def __init__(self, title, parent):
super(Button, self).__init__(title, parent) def mouseMoveEvent(self, e): # Here we decide that we can perform drag & drop only with a right mouse button. The left mouse button is reserved for clicking on the button.
if e.buttons() != QtCore.Qt.RightButton:
return # The QDrag object is created. The class provides support for MIME-based drag and drop data transfer.
mimeData = QtCore.QMimeData() drag = QtGui.QDrag(self)
drag.setMimeData(mimeData)
drag.setHotSpot(e.pos() - self.rect().topLeft()) # The start() method of the drag object starts the drag & drop operation.
dropAction = drag.start(QtCore.Qt.MoveAction) # We print 'press' to the console if we left click on the button with the mouse. Notice that we call mousePressEvent() method on the parent as well. Otherwise, we would not see the button being pushed.
def mousePressEvent(self, e): super(Button, self).mousePressEvent(e) if e.button() == QtCore.Qt.LeftButton:
print 'press' class Example(QtGui.QWidget): def __init__(self):
super(Example, self).__init__() self.initUI() def initUI(self): self.setAcceptDrops(True) self.button = Button('Button', self)
self.button.move(100, 65) self.setWindowTitle('Click or Move')
self.setGeometry(300, 300, 280, 150)
self.show() def dragEnterEvent(self, e): e.accept() def dropEvent(self, e): # In the dropEvent() method we code what happens after we release the mouse button and finish the drop operation. We find out the current mouse pointer position and move the button accordingly.
position = e.pos()
self.button.move(position) # We specify the type of the drop action. In our case it is a move action.
e.setDropAction(QtCore.Qt.MoveAction)
e.accept() def main(): app = QtGui.QApplication([])
ex = Example()
sys.exit(app.exec_()) if __name__ == '__main__':
main()
ZetCode PyQt4 tutorial Drag and Drop的更多相关文章
- ZetCode PyQt4 tutorial widgets II
#!/usr/bin/python # -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial In this example, ...
- ZetCode PyQt4 tutorial widgets I
#!/usr/bin/python # -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial In this example, ...
- ZetCode PyQt4 tutorial Dialogs
#!/usr/bin/python # -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial In this example, ...
- ZetCode PyQt4 tutorial signals and slots
#!/usr/bin/python # -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial In this example, ...
- ZetCode PyQt4 tutorial layout management
!/usr/bin/python -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial This example shows ...
- ZetCode PyQt4 tutorial work with menus, toolbars, a statusbar, and a main application window
!/usr/bin/python -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial This program create ...
- ZetCode PyQt4 tutorial First programs
#!/usr/bin/python # -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial In this example, ...
- ZetCode PyQt4 tutorial custom widget
#!/usr/bin/python # -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial In this example, ...
- ZetCode PyQt4 tutorial basic painting
#!/usr/bin/python # -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial In this example, ...
随机推荐
- 安装完C++builder6.0启动的时候总是出现无法将'C:\Program Files\Borland\CBuilder6\Bin\bcb.$$$'重命名为bcb.dro
:兼容性问题 运行前右键属性“兼容性”-尝试不同的兼容性.比如“windows 8”
- uva10537 dijkstra + 逆推
21:49:45 2015-03-09 传送 http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8& ...
- Restoring Numbers
D. Restoring Numbers ...
- linux在线安装telnet
平常在调试机器网络互通的时候使用到telnet,新机器一般没安装相应命令,需要我们手工安装. 下面是在线安装的方法,使用以下命令即可完成安装: yum install telnet
- 20135302魏静静——Linux课程期中总结
Linux期中总结 Linux课程第一周实验及总结:[http://www.cnblogs.com/20135302wei/p/5218607.html] 冯诺依曼体系结构的核心思想是存储程序计算机. ...
- 20145204Android开发基础
实验四 20145204Android开发基础 实验名称 Android开发基础 实验内容 基于Android Studio开发简单的Android应用并部署测试; 了解Android组件.布局管理器 ...
- 线程访问ui,使用委托方式
转:https://www.cnblogs.com/muyoucai/p/6257213.html Control类提供了一个Invoke方法来给子线程访问主线程的控件,它的原型是酱紫的: objec ...
- CentOS7.2 安装Chrome
/etc/yum.repos.d/目录下新建文件google-chrome.repo,向其中添加如下内容: [google-chrome] name=google-chrome baseurl=htt ...
- poj_3071 Football(概率dp)
直接上状态转移方程: 记dp[i][j]为第i轮比赛,第j个队伍获胜的概率. 那么初始状态下,dp[0][j]=1://也就是第0轮比赛全都获胜 d[i][j]=sum(d[i-1][j]*d[i-1 ...
- 微信小程序路过——新手不要错过哦!
应该算是入门篇, 从我怎么0基础然后沿着什么方向走,遇到的什么坑,如何方向解决,不过本人接触不是很多,所以也就了解有限. 小程序的前提: 1.小程序大小不允许超过2M.(也就是本地图片,大图精图不要在 ...