pyqt之QGraphics系列----节点编辑器(二)

仓库地址 https://gitlab.com/pavel.krupala/pyqt-node-editor-tutorials.git

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效果图

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• node_editor_wnd.py
  增加了一些测试

from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

from node_graphics_scene import QDMGraphicsScene
from node_graphics_view import QDMGraphicsView


class NodeEditorWnd(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.initUI()


    def initUI(self):
         ...
        self.addDebugContent()

    def addDebugContent(self):
        greenBrush = QBrush(Qt.green)
        outlinePen = QPen(Qt.black)
        outlinePen.setWidth(2)


        rect = self.grScene.addRect(-100, -100, 80, 100, outlinePen, greenBrush)
        rect.setFlag(QGraphicsItem.ItemIsMovable)

        text = self.grScene.addText("This is my Awesome text!", QFont("Ubuntu"))
        text.setFlag(QGraphicsItem.ItemIsSelectable)
        text.setFlag(QGraphicsItem.ItemIsMovable)
        text.setDefaultTextColor(QColor.fromRgbF(1.0, 1.0, 1.0))


        widget1 = QPushButton("Hello World")
        proxy1 = self.grScene.addWidget(widget1)
        proxy1.setFlag(QGraphicsItem.ItemIsMovable)
        proxy1.setPos(0, 30)


        widget2 = QTextEdit()
        proxy2 = self.grScene.addWidget(widget2)
        proxy2.setFlag(QGraphicsItem.ItemIsSelectable)
        proxy2.setPos(0, 60)


        line = self.grScene.addLine(-200, -200, 400, -100, outlinePen)
        line.setFlag(QGraphicsItem.ItemIsMovable)
        line.setFlag(QGraphicsItem.ItemIsSelectable)

• node_graphics_view.py

from PyQt5.QtWidgets import QGraphicsView
from PyQt5.QtCore import *
from PyQt5.QtGui import *


class QDMGraphicsView(QGraphicsView):
    def __init__(self, grScene, parent=None):
        super().__init__(parent)
        self.grScene = grScene

        self.initUI()

        self.setScene(self.grScene)


    def initUI(self):
        # 图像品质
        self.setRenderHints(QPainter.Antialiasing | QPainter.HighQualityAntialiasing | QPainter.TextAntialiasing | QPainter.SmoothPixmapTransform)
        # 全部刷新
        self.setViewportUpdateMode(QGraphicsView.FullViewportUpdate)

        self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        selfRR.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)

QGraphicsItem 的flag 一般设置为 setFlag(QGraphicsItem.ItemIsMovable)和
setFlag(QGraphicsItem.ItemIsSelectable) 表示可移动和可选择