Python 为什么可以';我是否在graphicsview上使用鼠标事件(mouseMoveEvent、mouseReleaseEvent)?
我想使用python和pyqt5制作裁剪图像工具 在下面的代码中,我无法在上使用mouseMoveEvent和mouseReleaseEvent 图形视图 但是,我只能在graphicview上使用mousePressEvent。我检查了关于QGraphicView属性的交互Python 为什么可以';我是否在graphicsview上使用鼠标事件(mouseMoveEvent、mouseReleaseEvent)?,python,python-3.x,pyqt,pyqt5,qt-designer,Python,Python 3.x,Pyqt,Pyqt5,Qt Designer,我想使用python和pyqt5制作裁剪图像工具 在下面的代码中,我无法在上使用mouseMoveEvent和mouseReleaseEvent 图形视图 但是,我只能在graphicview上使用mousePressEvent。我检查了关于QGraphicView属性的交互 import sys from PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5.QtWidgets import * from PIL import I
import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PIL import Image
from PyQt5 import uic
QApplication.setAttribute(Qt.AA_EnableHighDpiScaling, True)
IS_RESULT = False
CROP_UI = uic.loadUiType("Image_crop_screen.ui")[0]
BRING_IN_IMG_ROUTE = "C:/Users/yoon/Desktop/test/test.jpg"
class MainScreen(QMainWindow, CROP_UI):
def __init__(self):
super().__init__()
self.setupUi(self)
# Graphic Screen set
self.img = QGraphicsPixmapItem(QPixmap(BRING_IN_IMG_ROUTE))
self.scene = QGraphicsScene()
self.scene.addItem(self.img)
self.graphicsView.setScene(self.scene)
self.graphicsView.pencolor = QColor(240, 240, 240)
self.graphicsView.brushcolor = QColor(255, 255, 255, 0)
QGV = QGraphicsView()
self.items = []
# Full Screen set size
_WIDTH_ADD = 25
_HEIGHT_ADD = 25
self.setGeometry(0, 0, 640 + _WIDTH_ADD, 500 + _HEIGHT_ADD)
def moveEvent(self, e):
rect = QRectF(self.rect())
rect.adjust(0, 0, 0, 0) # 창 스크롤 바 없애기 위해서 일부 크기 작게 설정
self.scene.setSceneRect(rect)
# Draw rectangular while moving mouse
def mouseMoveEvent(self, e):
# e.buttons()는 정수형 값을 리턴, e.button()은 move시 Qt.Nobutton 리턴
print(Qt.LeftButton)
print(e.buttons())
print(e)
if e.buttons() & Qt.LeftButton:
self.end = e.pos()
pen = QPen(self.parent().pencolor)
brush = QBrush(self.parent().brushcolor)
pen.setWidth(3)
# 장면에 그려진 이전 선을 제거
if len(self.items) > 0:
self.scene.removeItem(self.items[-1])
del (self.items[-1])
rect = QRectF(self.start, self.end)
self.items.append(self.scene.addRect(rect, pen, brush))
def mousePressEvent(self, e):
if e.button() == Qt.LeftButton:
# 시작점 저장
self.start = e.pos()
self.end = e.pos()
print(Qt.LeftButton)
print(e.buttons())
print(e)
def mouseReleaseEvent(self, e):
print("aaa2")
if e.button() == Qt.LeftButton:
global IS_RESULT
print("ttt2")
pen = QPen(self.parent().pencolor)
brush = QBrush(self.parent().brushcolor)
self.items.clear()
rect = QRectF(self.start, self.end)
self.scene.addRect(rect, pen, brush)
print("(" + str(self.start.x()) + ", " + str(self.start.y()) + "), (" + str(self.end.x()) + ", " + str(
self.end.y()) + ")")
area = (self.start.x(), self.start.y(), self.end.x(), self.end.y())
if __name__ == '__main__':
app = QApplication(sys.argv)
w = MainScreen()
w.show()
sys.exit(app.exec_())
如果您想要收听QGraphicsView的事件,您不应该覆盖另一个小部件的事件,因为某些事件不会被传输。在这种情况下,最好使用跟踪鼠标的事件过滤器,在这种情况下,应该监视QGraphicsView的viewport()的事件 在下面的示例中,我将演示如何使用鼠标创建矩形
class主屏幕(QMainWindow,裁剪UI):
定义初始化(自):
super()。\uuuu init\uuuuu()
self.setupUi(self)
#图形屏幕集
self.img=QGraphicsPixmapItem(QPixmap(引入img路径))
self.scene=qgraphicscene()
self.scene.addItem(self.img)
self.graphicsView.setScene(self.scene)
#全屏设置大小
_宽度加上=25
_高度加上=25
self.setGeometry(0,0,640+\u宽度\u添加,500+\u高度\u添加)
self.graphicsView.viewport().installEventFilter(self)
self.current\u项目=无
self.start_pos=QPointF()
self.end_pos=QPointF()
def事件过滤器(自身、o、e):
如果self.graphicsView.viewport()为o:
如果e.type()==QEvent.mousebutton按下:
如果e.buttons()&Qt.LeftButton:
印刷(“印刷”)
self.start\u pos=self.end\u pos=self.graphicsView.maptosene(
e、 pos()
)
pen=QPen(QColor(240240240))
笔设置宽度(3)
画笔=QBrush(QColor(1002551000))
self.current_item=self.scene.addRect(QRectF(),画笔,画笔)
自我更新项目()
elif e.type()==QEvent.MouseMove:
如果e.buttons()&Qt.LeftButton和self.current_项不是None:
打印(“移动”)
self.end_pos=self.graphicsView.maptosene(e.pos())
自我更新项目()
elif e.type()==QEvent.MouseButtonRelease:
打印(“发布”)
self.end_pos=self.graphicsView.maptosene(e.pos())
自我更新项目()
self.current\u项目=无
return super().eventFilter(o,e)
定义更新项(自身):
如果self.current_项不是None:
self.current\u item.setRect(QRectF(self.start\u pos,self.end\u pos.normalized())
您必须创建一个类型为QGraphicView的类,您将在其中使用鼠标事件
class MyGraphicView(QGraphicsView):
def __init__():
super.__init__(self)
self.myScene = QGraphicsScene()
self.setScene(self.myScene)
# the rest code
def mousePressEvent(self, event):
...
def mouseMoveEvent(self, event):
...
def mouseReleaseEvent(self, event):
...