I have simple application based on PyQT5.
I need to get DOM element that is under mouse cursor when the mouse button is clicked.
Ok. Will answer myself:
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.view = QWebView(self)
self.view.installEventFilter(self)
# create other components here
def eventFilter(self, obj, event):
if obj == self.view:
if (event.type() == QEvent.MouseButtonRelease):
htc = self.view.page().mainFrame().hitTestContent(event.pos())
e = htc.element()
if e:
#do somesing with e
return True
return QMainWindow.eventFilter(obj, event)
Related
I'm new to PyQt and started playing around with some online code. The drawEllipse() function found in QPainter class draws an ellipse based on defined parameters. My question is once we call the function and it draws it on our scene, how do I undo this operation? There seems to be no such function that can do this in the documentation.
Example drawing code:
def draw(self, x, y):
painter = QPainter()
painter.begin(self.image)
painter.setPen(QPen(Qt.red, 5, Qt.SolidLine))
painter.drawEllipse(QPoint(y,x),10,10)
painter.end()
self.scene.addPixmap(QPixmap.fromImage(self.image))
So if a keystroke of Ctrl+Z is pressed this drawn circle should disappear, is this possible?
I do not understand why you use QImage because if you want to graph circles you should use QGraphicsEllipseItem.
To implement the undo method we must store the items in a list, then when you call the undo method you get the last element and remove it from the QGraphicsScene using removeItem().
In the following example, a circle is added each time you click.
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
class Widget(QtWidgets.QWidget):
def __init__(self, parent=None):
QtWidgets.QWidget.__init__(self, parent)
lay = QtWidgets.QVBoxLayout(self)
self.gv = QtWidgets.QGraphicsView()
lay.addWidget(self.gv)
self.scene = QtWidgets.QGraphicsScene(0, 0, 400, 400)
self.gv.setScene(self.scene)
self.gv.installEventFilter(self)
self.items = []
shortcut = QtWidgets.QShortcut(QtGui.QKeySequence("Ctrl+Z"), self)
shortcut.activated.connect(self.undo)
def eventFilter(self, obj, event):
if obj == self.gv and event.type() == QtCore.QEvent.MouseButtonPress:
p = self.gv.mapToScene(event.pos())
self.draw(p)
return QtWidgets.QWidget.eventFilter(self, obj, event)
def draw(self, p):
it = QtWidgets.QGraphicsEllipseItem(0, 0, 10, 10)
it.setPen(QtGui.QPen(QtCore.Qt.red, 5, QtCore.Qt.SolidLine))
self.scene.addItem(it)
it.setPos(p)
self.items.append(it)
def undo(self):
if self.items:
it = self.items.pop()
self.scene.removeItem(it)
del it
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())
Hello
I am using Pyqt5 & QT Designer to create a GUI. and i would like to use two keyPressEvent in one class. one of them to exit from the GUI and the other to hide a button.The problem is that the keyPressEvent overwrite each other so that they can't preform together
Part of the code:
....
self.pushButton = MYButton(self.centralwidget)
....
class MainWindow(QMainWindow, Ui_MainWindow):
def __init__(self, parent=None):
QMainWindow.__init__(self, parent=parent)
self.setupUi(self)
self.initMe()
def initMe(self):
self.pushButton.setToolTip('This is a <u> Button </u>')
self.pushButton.clicked.connect(self.pressed)
QToolTip.setFont(QFont('Arial',7))
self.setToolTip('Das ist ein Fenster!')
self.pushButton_2.clicked.connect(self.close)
def druecken(self): #1
Sender = self.sender()
Sender.move(50,50)
print(Sender.text()+'the Button is already pressed')
def keyPressEvent(self, e):
if e.key() == Qt.Key_W:
self.close()
class MYButton(QPushButton):
def keyPressEvent(self, e):
if e.key() == Qt.Key_Escape:
self.close()
So for example i have to press the Escape key first to hide the buttom then i can't press the W Key to close the GUI. But when i do it oppisitly it does not work because MYButton function is still runing and its keyPressEvent is activied. So how i get the both to run together?
from PyQt4 import QtGui, QtCore
class Window(QtGui.QWidget):
def __init__(self):
QtGui.QWidget.__init__(self)
self.view = View(self)
self.button = QtGui.QPushButton('Clear View', self)
self.button.clicked.connect(self.handleClearView)
layout = QtGui.QVBoxLayout(self)
layout.addWidget(self.view)
layout.addWidget(self.button)
def handleClearView(self):
self.view.scene().clear()
class DragButton(QtGui.QPushButton):
def mousePressEvent(self, event):
self.__mousePressPos = None
self.__mouseMovePos = None
if event.button() == QtCore.Qt.LeftButton:
self.__mousePressPos = event.globalPos()
self.__mouseMovePos = event.globalPos()
#super(DragButton, self).mousePressEvent(event)
def mouseMoveEvent(self, event):
if event.buttons() == QtCore.Qt.LeftButton:
# adjust offset from clicked point to origin of widget
currPos = self.mapToGlobal(self.pos())
globalPos = event.globalPos()
diff = globalPos - self.__mouseMovePos
newPos = self.mapFromGlobal(currPos + diff)
self.move(newPos)
self.__mouseMovePos = globalPos
#super(DragButton, self).mouseMoveEvent(event)
def mouseReleaseEvent(self, event):
if self.__mousePressPos is not None:
moved = event.globalPos() - self.__mousePressPos
if moved.manhattanLength() > 3:
event.ignore()
return
#super(DragButton, self).mouseReleaseEvent(event)
class View(QtGui.QGraphicsView):
def __init__(self, parent):
QtGui.QGraphicsView.__init__(self, parent)
self.setScene(QtGui.QGraphicsScene(self))
self.setSceneRect(QtCore.QRectF(self.viewport().rect()))
btn1=DragButton('Test1', self)
btn2=DragButton('Test2', self)
def mousePressEvent(self, event):
self._start = event.pos()
def mouseReleaseEvent(self, event):
start = QtCore.QPointF(self.mapToScene(self._start))
end = QtCore.QPointF(self.mapToScene(event.pos()))
self.scene().addItem(
QtGui.QGraphicsLineItem(QtCore.QLineF(start, end)))
for point in (start, end):
text = self.scene().addSimpleText(
'(%d, %d)' % (point.x(), point.y()))
text.setBrush(QtCore.Qt.red)
text.setPos(point)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = Window()
window.resize(640, 480)
window.show()
sys.exit(app.exec_())
Here is my code. There are two movable buttons on the QGraphicsView and I can draw line on the QGraphicsView with mouse dragging. But what I want to do is to draw line between two buttons. For detail, If I right click the btn1(Test1) and then right click the btn2(Test2) , the line would be created between two buttons. I'm struggling this problem for a month. Plz Help!
I am assuming that the line you need to draw between the buttons must also be movable. If not it is just simple you can just use :
lines = QtGui.QPainter()
lines.setPen(self)
lines.drawLine(x1,y1,x2,y2)
So, if the line needs to be movable along with the buttons then first you create a mini widget consisting of Two Buttons and the Line, so you can move the whole widget. This might help!, in that case.
Hi I want to drag a file (image) into my gui with PySide, however I can't get it to work. I Cannot get it to go into the dropEvent Function. My object that I am trying to drag into is a QGraphicsView so the filter can't take over the whole gui because I want to drag two images into it.
class Consumer(QMainWindow, Ui_MainWindow, QComboBox, QtGui.QWidget):
def __init__(self, parent=None):
self.paylod = None
super(Consumer, self).__init__(parent)
self.setupUi(self)
self.chkApplyCompression.stateChanged.connect(self.makecompress)
self.viewCarrier1.setMouseTracking(True)
self.viewCarrier1.installEventFilter(self)
layout = QtGui.QVBoxLayout(self)
layout.addWidget(self.viewCarrier1)
def eventFilter(self, source, event):
if (event.type() == QtCore.QEvent.QDropEvent and
print('yay?')
return QtGui.QWidget.eventFilter(self, source, event)
def dropEvent(self, e):
print("yay")
def dragEnterEvent(self, *args, **kwargs):
print("Yay!!")
if __name__ == "__main__":
currentApp = QtGui.QApplication(sys.argv)
currentForm = Consumer()
currentForm.show()
currentApp.exec_()
Thanks
You need to accept the drag enter event before Qt will handle a subsequent drop event:
def dragEnterEvent(self, event):
event.accept()
learning PyQt5 recently, I've tried to drag a QPushButton learning this tutorial Drag & drop a button widget, and made some improvements to place the button more accurate, so I add
mime = e.mimeData().text()
x, y = mime.split(',')
according to #Avaris for this question, but I found e.mimeData().text() returned nothing which supposed to be the coordinate of local position of the cursor with respect to the button, i tried to print(mime), and got a blank line with nothing, then i print(mime.split(',')) and got ['']。
here's the code:
import sys
from PyQt5.QtWidgets import QPushButton, QWidget, QApplication, QLabel
from PyQt5.QtCore import Qt, QMimeData
from PyQt5.QtGui import QDrag
from PyQt5 import QtCore
class Button(QPushButton):
def __init__(self, title, parent):
super().__init__(title, parent)
def mouseMoveEvent(self, e):
if e.buttons() != Qt.RightButton:
return
mimeData = QMimeData()
drag = QDrag(self)
drag.setMimeData(mimeData)
dropAction = drag.exec_(Qt.MoveAction)
def mousePressEvent(self, e):
QPushButton.mousePressEvent(self, e)
if e.button() == Qt.LeftButton:
print('press')
class Example(QWidget):
def __init__(self):
super().__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)
def dragEnterEvent(self, e):
e.accept()
def dropEvent(self, e):
position = e.pos()
mime = e.mimeData().text()
x, y = mime.split(',')
#print(mime.split(','))
self.button.move(position - QtCore.QPoint(int(x), int(y)))
e.setDropAction(Qt.MoveAction)
e.accept()
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = Example()
ex.show()
app.exec_()
In the answer of #Avaris, you will notice they set the mimedata with the button position in the mouseMoveEvent:
mimeData = QtCore.QMimeData()
# simple string with 'x,y'
mimeData.setText('%d,%d' % (e.x(), e.y()))
The mimedata does not contain anything by default. You have to set everything yourself! Have a look at the documentation for QMimeData to see what else you can do (other than setting arbitrary text)
Drag and Drop in Camera View
def dragEnterEvent(self, event): # Drag lines
mimeData = QtCore.QMimeData()
if mimeData.hasText:
event.accept()
else:
event.ignore()
def dropEvent(self, event): # Drop lines
mimeData = QtCore.QMimeData()
format = 'application/x-qabstractitemmodeldatalist'
data=event.mimeData().data(format) # Drag Drop get data's name
name_str = codecs.decode(data,'utf-8') # Convert byte to string
mimeData.setText(name_str)
# print(name_str[26:].replace('\x00','').strip("")) # remove white space
if mimeData.hasText:
print(name_str)
# write what you will do