更改多選擇綁定密鑰在QGraphicsScene

Question

我繼承在PyQt的QGraphicsScene和要使用多選項目，而不是控制關鍵移位鍵（修正值）。

我可以通過繼承它並製作我自己的mousePressedEvent來實現，但是當我這樣做時，場景中的graphicsItem在我開始拖動它們時表現怪異。

所有我需要的是改變控制關鍵轉變鍵多選。如果有人能幫忙，我將不勝感激。

from PyQt4.QtCore import * 
from PyQt4.QtGui import * 

class GraphicsScene(QGraphicsScene): 
    def __init__(self, parent=None, ns=""): 
     super(GraphicsScene, self).__init__(parent) 
     self.parent = parent 
     self.prevItem = [] 
     self.ns = ns 
     self.setBackgroundBrush(QBrush(QColor(50,50,50) , Qt.SolidPattern)) 


    def mouseReleaseEvent(self, event): 
     if event.button() == 2: #Right mouse click 
      #Set previous selections selected 
      for item in self.prevItem: 
       item.setSelected(1) 

      item = self.itemAt(event.lastScenePos().x(), event.lastScenePos().y()) 
      if item: 
       item.setSelected(1) 

     if event.button() == 1: # Left mouse click 
      #Get selected item 
      items = self.selectedItems() 

      #Shift click 
      if event.modifiers() & Qt.ShiftModifier: 
       #Set previous items selected 
       for item in self.prevItem: 
        item.setSelected(1) 

       for item in items: 
        self.prevItem.append(item) 

       item = self.itemAt(event.scenePos().x(), event.scenePos().y()) 
       if item == None: 
        self.clearSelection() 

      else: 
       self.prevItem = [] 
       for item in items: 
        self.prevItem.append(item) 

     super(GraphicsScene, self).mouseReleaseEvent(event) 

    def mousePressEvent(self, event): 
     if event.modifiers() & Qt.ShiftModifier: 
      item = self.itemAt(event.scenePos().x(), event.scenePos().y()) 
      if item: 
       item.setSelected(1) 

     super(GraphicsScene, self).mousePressEvent(event) 

class MainClass(QMainWindow): 
    def __init__(self, parent=None): 
     super(QMainWindow, self).__init__(parent)   

     self.setGeometry(50,50,400,600) 

     widget = QWidget() 
     self.setCentralWidget(widget) 
     layout = QGridLayout() 
     layout.setMargin(3) 

     widget.setLayout(layout) 

     view = QGraphicsView() 
     view.setMouseTracking(1) 
     view.setDragMode(QGraphicsView.RubberBandDrag) 
     view.setRenderHint(QPainter.Antialiasing) 
     view.setRenderHint(QPainter.TextAntialiasing) 
     view.setTransformationAnchor(QGraphicsView.AnchorUnderMouse) 
     view.setAlignment(Qt.AlignJustify) 


     scene = GraphicsScene(self) 
     scene.setSceneRect(0,0, 300, 500) 


     view.setScene(scene) 
     layout.addWidget(view) 

     elipseOne = QGraphicsEllipseItem (30,30,30,30, parent=None, scene=scene) 
     elipseOne.setFlags(QGraphicsItem.ItemIsSelectable | QGraphicsItem.ItemIsFocusable | QGraphicsItem.ItemIsMovable) 

     elipseTwo = QGraphicsEllipseItem (60,60,30,30, parent=None, scene=scene) 
     elipseTwo.setFlags(QGraphicsItem.ItemIsSelectable | QGraphicsItem.ItemIsFocusable | QGraphicsItem.ItemIsMovable) 

win = MainClass() 
win.show() 

Answer 1

修改您的mousePress和mouseRelease事件希望它有助於

from PyQt4.QtCore import * 
from PyQt4.QtGui import * 
import sys 
from collections import deque 

class GraphicsScene(QGraphicsScene): 
    def __init__(self, parent=None, ns=""): 
     super(GraphicsScene, self).__init__(parent) 
     self.parent = parent 
     self._selectedItemVec = deque() 
     self.ns = ns 
     self.setBackgroundBrush(QBrush(QColor(50,50,50) , Qt.SolidPattern)) 

    def mouseReleaseEvent(self, event): 
     item = self.itemAt(event.scenePos().x(), event.scenePos().y()) 
     if item: 
      item.setSelected(1) 
     else: 
      if len(self._selectedItemVec): 
       self._selectedItemVec.popleft() 
       return QGraphicsScene.mouseReleaseEvent(self, event) 
     if event.modifiers() & Qt.ShiftModifier: 
      for item in self._selectedItemVec: 
       item.setSelected(1) 
     else: 
      self._selectedItemVec.popleft() 

    def mousePressEvent(self, event): 

     item = self.itemAt(event.scenePos().x(), event.scenePos().y()) 
     if item: 
      item.setSelected(1) 
      self._selectedItemVec.append(item) 
     else: 
      return QGraphicsScene.mousePressEvent(self, event) 


class MainClass(QMainWindow): 
    def __init__(self, parent=None): 
     super(QMainWindow, self).__init__(parent)   

     self.setGeometry(50,50,400,600) 

     widget = QWidget() 
     self.setCentralWidget(widget) 
     layout = QGridLayout() 
     layout.setMargin(3) 

     widget.setLayout(layout) 

     view = QGraphicsView() 
     view.setMouseTracking(1) 
     view.setDragMode(QGraphicsView.RubberBandDrag) 
     view.setRenderHint(QPainter.Antialiasing) 
     view.setRenderHint(QPainter.TextAntialiasing) 
     view.setTransformationAnchor(QGraphicsView.AnchorUnderMouse) 
     view.setAlignment(Qt.AlignJustify) 


     scene = GraphicsScene(self) 
     scene.setSceneRect(0,0, 300, 500) 


     view.setScene(scene) 
     layout.addWidget(view) 

     elipseOne = QGraphicsEllipseItem (30,30,30,30, parent=None, scene=scene) 
     elipseOne.setFlags(QGraphicsItem.ItemIsSelectable | QGraphicsItem.ItemIsFocusable | QGraphicsItem.ItemIsMovable) 

     elipseTwo = QGraphicsEllipseItem (60,60,30,30, parent=None, scene=scene) 
     elipseTwo.setFlags(QGraphicsItem.ItemIsSelectable | QGraphicsItem.ItemIsFocusable | QGraphicsItem.ItemIsMovable) 
if __name__ == '__main__': 

    app = QApplication(sys.argv) 
    win = MainClass() 
    win.show() 
    sys.exit(app.exec_())