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POsubclassed QGraphicsItem not getting mouse events when used as module
 

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  1. POsubclassed QGraphicsItem not getting mouse events when used as module
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    <p>I'm using Pyside to create an interactive subclassed QGraphicsView - containing some subclassed QGraphicsItems. It works well in its own module and receives mouse events. </p> <p>But when used as a module from another file, and incorporated into another Layout - my mouse events are not being triggered. However .itemChange is working. Everything except the mouse events. I am not using tracking events such as hover. I am using mousePressEvent and mouseReleaseEvent.</p> <p>I have seen c++ responses about setting "setMouseTracking" but this is for widgets and my QGraphicsItems have been added as items not widgets. So when I call this funcion it tells me it doesn't exist for items. Also that seems to be for hover type of events - which I am not needing. I believe I am subclassing properly and I pass on the events to the parent class. As I said at the start - my code works fine in a standalone file.</p> <p>Any ideas what I've forgotten to do ?</p> <p>Here is the standalone - working program: Save as test_subclass_module.py</p> <pre><code>import sys import weakref import math from PySide import QtCore, QtGui ### class Edge(QtGui.QGraphicsItem): Type = QtGui.QGraphicsItem.UserType + 2 def __init__(self, sourceNode, destNode): QtGui.QGraphicsItem.__init__(self) # self.sourcePoint = QtCore.QPointF() self.destPoint = QtCore.QPointF() self.setAcceptedMouseButtons(QtCore.Qt.NoButton) self.source = weakref.ref(sourceNode) self.dest = weakref.ref(destNode) self.source().addEdge(self) self.dest().addEdge(self) self.set_index() self.adjust() def type(self): return Edge.Type def sourceNode(self): return self.source() def setSourceNode(self, node): self.source = weakref.ref(node) self.adjust() def destNode(self): return self.dest() def setDestNode(self, node): self.dest = weakref.ref(node) self.adjust() def set_index(self): self.setToolTip(self.source().label) def adjust(self): # do we have a line to draw ? if self.source() and self.dest(): line = QtCore.QLineF(self.mapFromItem(self.source(), 0, 0), self.mapFromItem(self.dest(), 0, 0)) length = line.length() if length &gt; 20: edgeOffset = QtCore.QPointF((line.dx() * 10) / length, (line.dy() * 10) / length) self.prepareGeometryChange() self.sourcePoint = line.p1() + edgeOffset self.destPoint = line.p2() - edgeOffset else: # want to make sure line not drawn self.prepareGeometryChange() self.sourcePoint = self.destPoint def boundingRect(self): # do we have a line to draw ? if not self.source() or not self.dest(): return QtCore.QRectF() else: extra = 1 return QtCore.QRectF(self.sourcePoint, QtCore.QSizeF(self.destPoint.x() - self.sourcePoint.x(), self.destPoint.y() - self.sourcePoint.y())).normalized().adjusted(-extra, -extra, extra, extra) def paint(self, painter, option, widget): if self.source() and self.dest(): # Draw the line itself. line = QtCore.QLineF(self.sourcePoint, self.destPoint) if line.length() &gt; 0.0: painter.setPen(QtGui.QPen(QtCore.Qt.black, 1, QtCore.Qt.SolidLine, QtCore.Qt.RoundCap, QtCore.Qt.RoundJoin)) painter.drawLine(line) ### class Node(QtGui.QGraphicsItem): Type = QtGui.QGraphicsItem.UserType + 1 def __init__(self, graphWidget, time, temp, pos): QtGui.QGraphicsItem.__init__(self) self.graph = weakref.ref(graphWidget) self.edgeList = [] self.set_index(pos) self.newPos = QtCore.QPointF() self.setFlag(QtGui.QGraphicsItem.ItemIsMovable) self.setFlag(QtGui.QGraphicsItem.ItemSendsGeometryChanges) self.setCacheMode(self.DeviceCoordinateCache) self.setZValue(-1) # self.temp = temp self.time = time x,y = self.map_temptime_to_pos() self.setPos(x,y) self.marker = False def type(self): return Node.Type def addEdge(self, edge): self.edgeList.append(weakref.ref(edge)) def set_index(self, index): self.index = index self.label = "Step %d" % index self.setToolTip(self.label) def get_prev_edge(self): index = 1000 edge = False for e in self.edgeList: sn = e().source().index dn = e().dest().index if sn &lt; index: index = sn edge = e if dn &lt; index: index = dn edge = e return edge def get_next_edge(self): index = -1 edge = False for e in self.edgeList: sn = e().source().index dn = e().dest().index if sn &gt; index: index = sn edge = e if dn &gt; index: index = dn edge = e return edge def map_temptime_to_pos(self): x = self.time * self.graph().graph_width_ratio y = self.graph().size[3] - self.temp * self.graph().graph_height_ratio return (x,y) def boundingRect(self): adjust = 2.0 return QtCore.QRectF(-10 - adjust, -10 - adjust, 22 + adjust, 23 + adjust) def paint(self, painter, option, widget): painter.drawLine(QtCore.QLineF(6,-40,6,-2)) painter.setPen(QtCore.Qt.NoPen) painter.setBrush(QtCore.Qt.lightGray) painter.drawEllipse(-10, -10, 20, 20) gradient = QtGui.QRadialGradient(0, 0, 22) if option.state &amp; QtGui.QStyle.State_Sunken: # selected gradient.setColorAt(0, QtGui.QColor(QtCore.Qt.darkGreen).lighter(120)) else: gradient.setColorAt(1, QtCore.Qt.blue) painter.setBrush(QtGui.QBrush(gradient)) painter.setPen(QtGui.QPen(QtCore.Qt.black, 0)) painter.drawEllipse(-6, -6, 12, 12) def itemChange(self, change, value): if change == QtGui.QGraphicsItem.ItemPositionChange: for edge in self.edgeList: edge().adjust() return QtGui.QGraphicsItem.itemChange(self, change, value) def mousePressEvent(self, event): if not self.graph().inhibit_edit: self.update() print "Node pressed" QtGui.QGraphicsItem.mousePressEvent(self, event) def mouseReleaseEvent(self, event): if not self.graph().inhibit_edit: self.update() print "Node released" # QtGui.QGraphicsItem.mouseReleaseEvent(self, event) ### class GraphWidget(QtGui.QGraphicsView): def __init__(self): QtGui.QGraphicsView.__init__(self) self.size = (-30, 30, 600, 400) # scene = QtGui.QGraphicsScene(self) scene.setItemIndexMethod(QtGui.QGraphicsScene.NoIndex) scene.setSceneRect(self.size[0],self.size[1],self.size[2],self.size[3]) self.setScene(scene) self.setCacheMode(QtGui.QGraphicsView.CacheBackground) self.setRenderHint(QtGui.QPainter.Antialiasing) self.setTransformationAnchor(QtGui.QGraphicsView.AnchorUnderMouse) self.setResizeAnchor(QtGui.QGraphicsView.AnchorViewCenter) # self.maxtemp = 300 self.maxtime = 160 self.nodecount = 0 self.calc_upper_limits() # self.scale(0.8, 0.8) self.setMinimumSize(600, 400) self.setWindowTitle(self.tr("Elastic Nodes")) self.inhibit_edit = False def calc_upper_limits(self): self.toptemp = (self.maxtemp / 100 + 1) * 100 self.toptime = (int(self.maxtime) / 30 + 1) * 30 self.graph_width_ratio = float(self.size[2]) /self.toptime self.graph_height_ratio = float(self.size[3]) / self.toptemp def add_node(self, time, temp, marker=False, pos=-1): self.nodecount += 1 scene = self.scene() # Insert Node into scene node = Node(self, time, temp, self.nodecount) scene.addItem(node) # Insert new edges nodes = self.get_ordered_nodes() if len(nodes) &gt; 1: e = Edge(nodes[-2], node) scene.addItem(e) # cleanup edge tooltips for n in self.get_ordered_nodes(): edges = n.edgeList for e in edges: e().set_index() def get_ordered_nodes(self): nodes = [item for item in self.scene().items() if isinstance(item, Node)] nodes.sort(key=lambda n: n.index) return nodes def keyPressEvent(self, event): key = event.key() if key == QtCore.Qt.Key_Plus: self.scaleView(1.2) elif key == QtCore.Qt.Key_Minus: self.scaleView(1 / 1.2) else: QtGui.QGraphicsView.keyPressEvent(self, event) def mousePressEvent(self, event): print "GraphWidget mouse" QtGui.QGraphicsView.mousePressEvent(self, event) def wheelEvent(self, event): self.scaleView(math.pow(2.0, -event.delta() / 240.0)) def scaleView(self, scaleFactor): factor = self.matrix().scale(scaleFactor, scaleFactor).mapRect(QtCore.QRectF(0, 0, 1, 1)).width() if factor &lt; 0.07 or factor &gt; 100: return self.scale(scaleFactor, scaleFactor) def drawBackground(self, painter, rect): sceneRect = self.sceneRect() if __name__ == "__main__": app = QtGui.QApplication(sys.argv) widget = GraphWidget() widget.add_node(0, 25) widget.add_node(30, 100) widget.add_node(60, 200) widget.show() sys.exit(app.exec_()) </code></pre> <p>Here is the parent program - which does not get the mouse events: Called test_toplevel.py</p> <pre><code># import user interface etc from PySide import QtCore, QtGui from test_tabs_ui import Ui_Form from test_subclass_module import * import sys Programs = {"Gen13": {"steps": [[0, 0, 0], [0, 30, 30], [0, 60, 60], [0, 77, 77]] }} ###----------------------------------------------------------- ### The dialog class Nusku_tab_Add_kiln(QtGui.QWidget): """ Create dialog to add/delete kilns from controlled kilns """ def __init__(self, parent=None): # Get the UI loaded super(Nusku_tab_Add_kiln, self).__init__(parent) self.ui = Ui_Form() self.ui.setupUi(self) self.current = Programs['Gen13'] # draw program in graphicsView # swap out the standin self.ui.graphLayout.removeWidget(self.ui.graphicsView) self.ui.graphicsView.setParent(None) self.ui.graphicsView.deleteLater() self.graph = GraphWidget() self.ui.graphLayout.addWidget(self.graph) self.draw_graph() def choose_program(self): pass def draw_graph(self): graph = self.graph graph.inhibit_edit = True steps = self.current['steps'] for s in steps: print s graph.add_node(s[1],s[2]) ###------------------------------------------------ if __name__ == '__main__': app = QtGui.QApplication(sys.argv) prog = Nusku_tab_Add_kiln() prog.show() sys.exit(app.exec_()) </code></pre> <p>For sake of completeness. Here is the ui file it imports: test_tabs_ui.py</p> <pre><code># -*- coding: utf-8 -*- # Form implementation generated from reading ui file 'test_tabs.ui' # # Created: Wed Dec 05 15:20:02 2012 # by: pyside-uic 0.2.14 running on PySide 1.1.1 # # WARNING! All changes made in this file will be lost! from PySide import QtCore, QtGui class Ui_Form(object): def setupUi(self, Form): Form.setObjectName("Form") Form.resize(595, 540) self.verticalLayout = QtGui.QVBoxLayout(Form) self.verticalLayout.setObjectName("verticalLayout") self.tabWidget = QtGui.QTabWidget(Form) self.tabWidget.setObjectName("tabWidget") self.Tab_Program = QtGui.QWidget() self.Tab_Program.setObjectName("Tab_Program") self.verticalLayout_2 = QtGui.QVBoxLayout(self.Tab_Program) self.verticalLayout_2.setObjectName("verticalLayout_2") self.frame_graph_status = QtGui.QFrame(self.Tab_Program) self.frame_graph_status.setFrameShape(QtGui.QFrame.StyledPanel) self.frame_graph_status.setFrameShadow(QtGui.QFrame.Raised) self.frame_graph_status.setObjectName("frame_graph_status") self.horizontalLayout_7 = QtGui.QHBoxLayout(self.frame_graph_status) self.horizontalLayout_7.setSpacing(0) self.horizontalLayout_7.setContentsMargins(0, 0, 0, 0) self.horizontalLayout_7.setObjectName("horizontalLayout_7") self.frame_program = QtGui.QFrame(self.frame_graph_status) self.frame_program.setFrameShape(QtGui.QFrame.StyledPanel) self.frame_program.setFrameShadow(QtGui.QFrame.Raised) self.frame_program.setObjectName("frame_program") self.graphLayout = QtGui.QVBoxLayout(self.frame_program) self.graphLayout.setContentsMargins(-1, 0, -1, 0) self.graphLayout.setObjectName("graphLayout") self.graphicsView = QtGui.QGraphicsView(self.frame_program) self.graphicsView.setObjectName("graphicsView") self.graphLayout.addWidget(self.graphicsView) self.horizontalLayout_7.addWidget(self.frame_program) self.verticalLayout_2.addWidget(self.frame_graph_status) self.widget_prog = QtGui.QWidget(self.Tab_Program) self.widget_prog.setObjectName("widget_prog") self.prog_layout = QtGui.QGridLayout(self.widget_prog) self.prog_layout.setContentsMargins(4, 4, 4, 4) self.prog_layout.setSpacing(0) self.prog_layout.setContentsMargins(0, 0, 0, 0) self.prog_layout.setObjectName("prog_layout") self.verticalLayout_2.addWidget(self.widget_prog) self.tabWidget.addTab(self.Tab_Program, "") self.Tab_alarms = QtGui.QWidget() self.Tab_alarms.setObjectName("Tab_alarms") self.alarms_tab_layout = QtGui.QVBoxLayout(self.Tab_alarms) self.alarms_tab_layout.setObjectName("alarms_tab_layout") self.tabWidget.addTab(self.Tab_alarms, "") self.Tab_settings = QtGui.QWidget() self.Tab_settings.setObjectName("Tab_settings") self.settings_tab_layout = QtGui.QVBoxLayout(self.Tab_settings) self.settings_tab_layout.setObjectName("settings_tab_layout") self.tabWidget.addTab(self.Tab_settings, "") self.Tab_pid = QtGui.QWidget() self.Tab_pid.setObjectName("Tab_pid") self.verticalLayout_8 = QtGui.QVBoxLayout(self.Tab_pid) self.verticalLayout_8.setSpacing(0) self.verticalLayout_8.setContentsMargins(0, 0, 0, 0) self.verticalLayout_8.setObjectName("verticalLayout_8") self.scrollArea_2 = QtGui.QScrollArea(self.Tab_pid) self.scrollArea_2.setWidgetResizable(True) self.scrollArea_2.setObjectName("scrollArea_2") self.scrollAreaWidgetContents_2 = QtGui.QWidget() self.scrollAreaWidgetContents_2.setGeometry(QtCore.QRect(0, 0, 569, 494)) self.scrollAreaWidgetContents_2.setObjectName("scrollAreaWidgetContents_2") self.PID_tab_layout = QtGui.QVBoxLayout(self.scrollAreaWidgetContents_2) self.PID_tab_layout.setSpacing(0) self.PID_tab_layout.setContentsMargins(0, 0, 0, 0) self.PID_tab_layout.setObjectName("PID_tab_layout") self.scrollArea_2.setWidget(self.scrollAreaWidgetContents_2) self.verticalLayout_8.addWidget(self.scrollArea_2) self.tabWidget.addTab(self.Tab_pid, "") self.verticalLayout.addWidget(self.tabWidget) self.retranslateUi(Form) self.tabWidget.setCurrentIndex(0) QtCore.QMetaObject.connectSlotsByName(Form) Form.setTabOrder(self.tabWidget, self.graphicsView) Form.setTabOrder(self.graphicsView, self.scrollArea_2) def retranslateUi(self, Form): Form.setWindowTitle(QtGui.QApplication.translate("Form", "Form", None, QtGui.QApplication.UnicodeUTF8)) self.graphicsView.setToolTip(QtGui.QApplication.translate("Form", "decimal point", None, QtGui.QApplication.UnicodeUTF8)) self.graphicsView.setStatusTip(QtGui.QApplication.translate("Form", "Accuracy can be increased at lower temperatures", None, QtGui.QApplication.UnicodeUTF8)) self.tabWidget.setTabText(self.tabWidget.indexOf(self.Tab_Program), QtGui.QApplication.translate("Form", "Program", None, QtGui.QApplication.UnicodeUTF8)) self.tabWidget.setTabText(self.tabWidget.indexOf(self.Tab_alarms), QtGui.QApplication.translate("Form", "Alarms", None, QtGui.QApplication.UnicodeUTF8)) self.tabWidget.setTabText(self.tabWidget.indexOf(self.Tab_settings), QtGui.QApplication.translate("Form", "Settings", None, QtGui.QApplication.UnicodeUTF8)) self.tabWidget.setTabText(self.tabWidget.indexOf(self.Tab_pid), QtGui.QApplication.translate("Form", "PID", None, QtGui.QApplication.UnicodeUTF8)) </code></pre>
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    1. COYes: you forgot to post the code.
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      1. USekhumoro
    2. COUmm, you set `inhibit_edit` to `False` in `test_toplevel.py`, which kind of makes your `Node`s to ignore mouse events?
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      1. USAvaris
    3. COmy life is a tragedy... :-(
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