[PyQt] Hover Event for a QGraphicsItem
sw33tz
nyavuz.nm20 at gmail.com
Sun May 8 15:01:13 BST 2016
I dont want to burden people with really long code so thats why I'm trying
to keep it as simple as possible. I'm actually implementing the same things
in my original code
On Sun, May 8, 2016 at 4:53 PM, Elvis Stansvik [via Python] <
ml-node+s6n5190335h96 at n6.nabble.com> wrote:
> 2016-05-08 15:24 GMT+02:00 sw33tz <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=5190335&i=0>>:
> > By the way I'm not posting the entire code so sometimes I might forget
> to
> > change the name of a variable or class but in my original code the
> format is
> > written correctly.
>
> In general, http://sscce.org/ is very good advice.
>
> When you send an example which the reader you seek help from cannot
> run, it puts an extra burden on that person, because he/she will often
> have to fix up the example and run it in order to help.
>
> I'm not going to borther doing that this time, but see my comments
> inline below, which are at best educated guesses since the code you
> have given won't run.
>
> >
> > On Sun, May 8, 2016 at 4:34 PM, Nesibe Yavuz <[hidden email]> wrote:
> >>
> >> So I rewrote what you suggested but I'm still not being able to detect
> the
> >> hover event...why is this working?
> >>
> >> class graphics_Object(QtGui.QGraphicsPixmapItem):
> >> def __init__(self, parent=None):
> >> super(graphics_Object, self).__init__(parent)
> >> pixmap = QtGui.QPixmap("switch.png").scaled(40, 40,
> >> QtCore.Qt.KeepAspectRatio)
> >> self.setPixmap(pixmap)
> >> self.setFlag(QtGui.QGraphicsPixmapItem.ItemIsSelectable)
> >> self.setFlag(QtGui.QGraphicsPixmapItem.ItemIsMovable)
> >> self.setAcceptHoverEvents(True)
> >> self.switch_LinkedWithItems = []
> >> self.switch_mininet_name = ''
> >>
> >> def hoverEnterEvent(self, event):
> >> print 'hello'
> >>
> >> def hoverLeaveEvent(self, event):
> >> print 'goodbye'
> >>
> >> class graphicsScene(QtGui.QGraphicsScene):
> >> def __init__(self, parent=None):
> >> super(graphicsScene, self).__init__(parent)
> >>
> >> def mousePressEvent(self, event):
> >> self.graphics_item = graphics_Object()
> >>
> >> def mouseReleaseEvent(self, event)
> >> self.addItem(self.graphics_item.graphics_pixItem)
>
> You're still doing something strange here if this is indeed your
> current code. Why are you (seemingly) keeping one graphics item as an
> attribute of another? That doesn't make sense, and it's probably still
> the case that the item you're adding is not of type graphics_Object,
> which is the class where you are overriding hoverEnterEvent /
> hoverLeaveEvent.
>
> From the looks of it, you've fixed everything but the issue I pointed
> out as the main one.
>
> Elvis
>
> >> self.graphics_item.setPos(event.scenePos())
> >>
> >>
> >> class Form(QtGui.QMainWindow):
> >> def __init__(self):
> >> super(Form, self).__init__()
> >> self.ui = uic.loadUi('form.ui')
> >>
> >> self.scene = graphicsScene()
> >> self.setMouseTracking(True)
> >>
> >>
> >>
> >>
> >> On Sun, May 8, 2016 at 1:54 PM, Elvis Stansvik [via Python] <[hidden
> >> email]> wrote:
> >>>
> >>> 2016-05-07 23:05 GMT+02:00 sw33tz <[hidden email]>:
> >>> > Thanks for replying...I've updated my code but I still cant get it
> to
> >>> > work:
> >>>
> >>> I've now had a closer look at your code. There are several problems
> >>> with which I point out inline below.
> >>>
> >>> >
> >>> > class graphics_Object(QtGui.QGraphicsPixmapItem):
> >>> > def __init__(self, parent=None):
> >>> > super(switch_Object, self).__init__(parent)
> >>>
> >>> This, as I already mentioned, should be graphics_Object and not
> >>> graphics_Object in the call to super(..).
> >>>
> >>> > pixmap = QtGui.QPixmap("item.png")
> >>> > self.graphics_pixItem =
> >>> > QtGui.QGraphicsPixmapItem(pixmap.scaled(40,
> >>> > 40, QtCore.Qt.KeepAspectRatio))
> >>> >
> >>> >
> >>> >
> self.graphics_pixItem.setFlag(QtGui.QGraphicsPixmapItem.ItemIsSelectable)
> >>> >
> >>> >
> self.graphics_pixItem.setFlag(QtGui.QGraphicsPixmapItem.ItemIsMovable)
> >>> > self.graphics_pixItem.setAcceptHoverEvents(True)
> >>> >
> >>> >
> >>> > def hoverEnterEvent(self, event):
> >>> > print 'hello'
> >>> Here's your real problem, you are overriding hoverEnterEvent in the
> >>> graphics_Object class, but the item that you are later adding to the
> >>> scene is self.graphics_pixItem, which is of type
> >>> QtGui.QGraphicsPixmapItem.
> >>>
> >>> >
> >>> > class graphicsScene(QtGui.QGraphicsScene):
> >>> > def __init__(self, parent=None):
> >>> > super(graphicsScene, self).__init__(parent)
> >>> >
> >>> > def mousePressEvent(self, event):
> >>> > self.graphics_item = graphics_Object()
> >>> > def mouseReleaseEvent(self, event)
> >>>
> >>> There's a missing ':' above.
> >>>
> >>> > self.addItem(self.self.graphics_item.graphics_pixItem)
> >>>
> >>> Apart from "self.self" which makes no sense (it should be just
> >>> "self.graphics_item"), here you are adding graphics_pixItem to the
> >>> scene, which is of type QtGui.QGraphicsPixmapItem, not of type
> >>> graphics_Object.
> >>>
> >>> You seem to have a misunderstanding of how inheritance vs composition
> >>> works.
> >>>
> >>> >
> >>> > self.graphics_item.self.graphics_pixItem.setPos(event.scenePos())
> >>>
> >>> Here's again a strange use of "self" which will give an error. `self`
> >>> is only available from within the class itself, the
> >>> "self.graphics_item.self" here should be just "self.graphics_item".
> >>>
> >>> Here's roughly how I would structure the code, given what I've seen in
> >>> your example (Python 2, PyQt 4, since I'm guessing that's what you
> >>> use):
> >>>
> >>>
> >>> main.py:
> >>>
> >>> from sys import argv, exit
> >>>
> >>> from PyQt4.QtGui import QApplication
> >>> from PyQt4.QtGui import QGraphicsItem
> >>> from PyQt4.QtGui import QGraphicsPixmapItem
> >>> from PyQt4.QtGui import QGraphicsScene
> >>> from PyQt4.QtGui import QMainWindow
> >>> from PyQt4.QtGui import QPixmap
> >>> from PyQt4.QtCore import Qt
> >>> from PyQt4.uic import loadUi
> >>>
> >>>
> >>> class Item(QGraphicsPixmapItem):
> >>>
> >>> def __init__(self, parent=None):
> >>> super(Item, self).__init__(parent)
> >>>
> >>> pixmap = QPixmap('item.png').scaled(40, 40,
> Qt.KeepAspectRatio)
> >>>
> >>> self.setPixmap(pixmap)
> >>> self.setFlag(QGraphicsItem.ItemIsSelectable)
> >>> self.setFlag(QGraphicsItem.ItemIsMovable)
> >>> self.setAcceptHoverEvents(True)
> >>>
> >>> def hoverEnterEvent(self, event):
> >>> print('hover enter') # Do whatever you need to do here
> >>>
> >>> def hoverLeaveEvent(self, event):
> >>> print('hover leave') # Do whatever you need to do here
> >>>
> >>>
> >>> class Scene(QGraphicsScene):
> >>>
> >>> def __init__(self, parent=None):
> >>> super(Scene, self).__init__(parent)
> >>>
> >>> def mouseReleaseEvent(self, event):
> >>> item = Item()
> >>> item.setPos(event.scenePos())
> >>> self.addItem(item)
> >>>
> >>>
> >>> class Window(QMainWindow):
> >>>
> >>> def __init__(self, parent=None):
> >>> super(Window, self).__init__(parent)
> >>>
> >>> loadUi('window.ui'), self)
> >>>
> >>> self.scene = Scene(self)
> >>> self.view.setScene(self.scene)
> >>>
> >>>
> >>> app = None
> >>>
> >>>
> >>> def main():
> >>> global app
> >>>
> >>> app = QApplication(argv)
> >>>
> >>> window = Window()
> >>> window.show()
> >>>
> >>> exit(app.exec_())
> >>>
> >>>
> >>> if __name__ == '__main__':
> >>> main()
> >>>
> >>>
> >>> window.ui:
> >>>
> >>> <?xml version="1.0" encoding="UTF-8"?>
> >>> <ui version="4.0">
> >>> <class>Window</class>
> >>> <widget class="QMainWindow" name="Window">
> >>> <property name="geometry">
> >>> <rect>
> >>> <x>0</x>
> >>> <y>0</y>
> >>> <width>800</width>
> >>> <height>600</height>
> >>> </rect>
> >>> </property>
> >>> <property name="windowTitle">
> >>> <string>MainWindow</string>
> >>> </property>
> >>> <widget class="QWidget" name="centralwidget">
> >>> <layout class="QVBoxLayout" name="verticalLayout">
> >>> <item>
> >>> <widget class="QGraphicsView" name="view"/>
> >>> </item>
> >>> </layout>
> >>> </widget>
> >>> </widget>
> >>> <resources/>
> >>> <connections/>
> >>> </ui>
> >>>
> >>>
> >>> Hope you can use that as starting point / inspiration and figure out
> >>> things from there.
> >>>
> >>> Elvis
> >>>
> >>> >
> >>> > class Form(QtGui.QMainWindow):
> >>>
> >>> > def __init__(self):
> >>> > super(Form, self).__init__()
> >>> > self.ui = uic.loadUi('form.ui')
> >>> >
> >>> > self.scene = graphicsScene()
> >>> > self.ui.view.setScene(self.scene)
> >>> >
> >>> > self.setMouseTracking(True)
> >>> >
> >>> >
> >>> > On Sat, May 7, 2016 at 10:55 PM, Elvis Stansvik [via Python]
> <[hidden
> >>>
> >>> > email]> wrote:
> >>> >>
> >>> >> Hi Nesibe,
> >>> >>
> >>> >> 2016-05-07 19:46 GMT+02:00 sw33tz <[hidden email]>:
> >>> >> > I want some small text to pop up when I have my curser over a
> >>> >> > QGraphicsItem
> >>> >> > in my QGraphicsScene. I have a class that inherits from
> >>> >> > QGraphicsItem,
> >>> >> > and
> >>> >> > this represents my graphical items in the scene.
> >>> >> >
> >>> >> > I tried using the QGraphicsItem.hoverEnterEvent and I also set
> the
> >>> >> > setAcceptHoverEvents(True), but I still can't enable that hover
> >>> >> > event. I
> >>> >> > also came across an event filter method but I'm not sure where to
> >>> >> > implement
> >>> >> > it.
> >>> >>
> >>> >> This seems to work here:
> >>> >>
> >>> >>
> >>> >> test.py:
> >>> >>
> >>> >> from sys import argv, exit
> >>> >>
> >>> >> from PyQt5.QtCore import Qt
> >>> >> from PyQt5.QtWidgets import QApplication
> >>> >> from PyQt5.QtWidgets import QGraphicsEllipseItem
> >>> >> from PyQt5.QtWidgets import QGraphicsScene
> >>> >> from PyQt5.QtWidgets import QGraphicsView
> >>> >> from PyQt5.QtWidgets import QMainWindow
> >>> >>
> >>> >>
> >>> >> class MyItem(QGraphicsEllipseItem):
> >>> >>
> >>> >> def __init__(self, parent=None):
> >>> >> super(MyItem, self).__init__(parent)
> >>> >>
> >>> >> self.setRect(50, 50, 50, 50)
> >>> >> self.setBrush(Qt.red)
> >>> >> self.setAcceptHoverEvents(True)
> >>> >>
> >>> >> def hoverEnterEvent(self, event):
> >>> >> print('hover enter')
> >>> >>
> >>> >> def hoverLeaveEvent(self, event):
> >>> >> print('hover leave')
> >>> >>
> >>> >>
> >>> >> app = None
> >>> >>
> >>> >>
> >>> >> def main():
> >>> >> global app
> >>> >>
> >>> >> app = QApplication(argv)
> >>> >>
> >>> >> scene = QGraphicsScene()
> >>> >> scene.addItem(MyItem())
> >>> >>
> >>> >> view = QGraphicsView()
> >>> >> view.setScene(scene)
> >>> >>
> >>> >> window = QMainWindow()
> >>> >> window.setCentralWidget(view)
> >>> >> window.show()
> >>> >>
> >>> >> exit(app.exec_())
> >>> >>
> >>> >>
> >>> >> if __name__ == '__main__':
> >>> >> main()
> >>> >>
> >>> >>
> >>> >> Hope that helps.
> >>> >>
> >>> >> Best regards,
> >>> >> Elvis
> >>> >>
> >>> >> >
> >>> >> > Should I install the event filter in the QGraphicsItem class, or
> the
> >>> >> > scene?
> >>> >> > I tried both and I'm still not getting the desired result. I want
> to
> >>> >> > be
> >>> >> > able
> >>> >> > to hover over all the items in the scene.
> >>> >> >
> >>> >> >
> >>> >> > class HoverEventFilter(QtCore.QObject):
> >>> >> > def eventFilter(self, receiver, event):
> >>> >> > if (event.type() == QtCore.QEvent.HoverEnter):
> >>> >> > # this is for test purposes
> >>> >> > print 'hover event'
> >>> >> > return True
> >>> >> > else:
> >>> >> > # Call Base Class Method to Continue Normal Event
> >>> >> > Processing
> >>> >> > return super(HoverEventFilter,
> >>> >> > self).eventFilter(receiver,
> >>> >> > event)
> >>> >> >
> >>> >> >
> >>> >> >
> >>> >> > --
> >>> >> > View this message in context:
> >>> >> >
> >>> >> >
> http://python.6.x6.nabble.com/Hover-Event-for-a-QGraphicsItem-tp5190283.html
> >>> >> > Sent from the PyQt mailing list archive at Nabble.com.
> >>> >> > _______________________________________________
> >>> >> > PyQt mailing list [hidden email]
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> >>> >> NAML
> >>> >
> >>> >
> >>> >
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> >>> >
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> >
> >
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