本文通过Python3+pyqt5实现了python Qt GUI 快速编程的16章的excise例子。
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#!/usr/bin/env python3import randomimport sys QModelIndex, QSize, QTimer, QVariant, Qt,pyqtSignal)from PyQt5.QtWidgets import (QApplication, QDialog, QHBoxLayout, QListView, QSpinBox, QStyledItemDelegate,QStyleOptionViewItem, QWidget)from PyQt5.QtGui import QColor,QPainter,QPixmapclass BarGraphModel(QAbstractListModel): dataChanged=pyqtSignal(QModelIndex,QModelIndex) def __init__(self): super(BarGraphModel, self).__init__() self.__data = [] self.__colors = {} self.minValue = 0 self.maxValue = 0 def rowCount(self, index=QModelIndex()): return len(self.__data) def insertRows(self, row, count): extra = row + count if extra >= len(self.__data): self.beginInsertRows(QModelIndex(), row, row + count - 1) self.__data.extend([0] * (extra - len(self.__data) + 1)) self.endInsertRows() return True return False def flags(self, index): #return (QAbstractTableModel.flags(self, index)|Qt.ItemIsEditable) return (QAbstractListModel.flags(self, index)|Qt.ItemIsEditable) def setData(self, index, value, role=Qt.DisplayRole): row = index.row() if not index.isValid() or 0 > row >= len(self.__data): return False changed = False if role == Qt.DisplayRole: value = value self.__data[row] = value if self.minValue > value: self.minValue = value if self.maxValue < value: self.maxValue = value changed = True elif role == Qt.UserRole: self.__colors[row] = value #self.emit(SIGNAL("dataChanged(QModelIndex,QModelIndex)"), # index, index) self.dataChanged[QModelIndex,QModelIndex].emit(index, index) changed = True if changed: #self.emit(SIGNAL("dataChanged(QModelIndex,QModelIndex)"), # index, index) self.dataChanged[QModelIndex,QModelIndex].emit(index, index) return changed def data(self, index, role=Qt.DisplayRole): row = index.row() if not index.isValid() or 0 > row >= len(self.__data): return QVariant() if role == Qt.DisplayRole: return self.__data[row] if role == Qt.UserRole: return QVariant(self.__colors.get(row, QColor(Qt.red))) if role == Qt.DecorationRole: color = QColor(self.__colors.get(row, QColor(Qt.red))) pixmap = QPixmap(20, 20) pixmap.fill(color) return QVariant(pixmap) return QVariant()class BarGraphDelegate(QStyledItemDelegate): def __init__(self, minimum=0, maximum=100, parent=None): super(BarGraphDelegate, self).__init__(parent) self.minimum = minimum self.maximum = maximum def paint(self, painter, option, index): myoption = QStyleOptionViewItem(option) myoption.displayAlignment |= (Qt.AlignRight|Qt.AlignVCenter) QStyledItemDelegate.paint(self, painter, myoption, index) def createEditor(self, parent, option, index): spinbox = QSpinBox(parent) spinbox.setRange(self.minimum, self.maximum) spinbox.setAlignment(Qt.AlignRight|Qt.AlignVCenter) return spinbox def setEditorData(self, editor, index): value = index.model().data(index, Qt.DisplayRole) editor.setValue(value) def setModelData(self, editor, model, index): editor.interpretText() model.setData(index, editor.value())class BarGraphView(QWidget): WIDTH = 20 def __init__(self, parent=None): super(BarGraphView, self).__init__(parent) self.model = None def setModel(self, model): self.model = model #self.connect(self.model, # SIGNAL("dataChanged(QModelIndex,QModelIndex)"), # self.update) self.model.dataChanged[QModelIndex,QModelIndex].connect(self.update) #self.connect(self.model, SIGNAL("modelReset()"), self.update) self.model.modelReset.connect(self.update) def sizeHint(self): return self.minimumSizeHint() def minimumSizeHint(self): if self.model is None: return QSize(BarGraphView.WIDTH * 10, 100) return QSize(BarGraphView.WIDTH * self.model.rowCount(), 100) def paintEvent(self, event): if self.model is None: return painter = QPainter(self) painter.setRenderHint(QPainter.Antialiasing) span = self.model.maxValue - self.model.minValue painter.setWindow(0, 0, BarGraphView.WIDTH * self.model.rowCount(), span) for row in range(self.model.rowCount()): x = row * BarGraphView.WIDTH index = self.model.index(row) color = QColor(self.model.data(index, Qt.UserRole)) y = self.model.data(index) painter.fillRect(x, span - y, BarGraphView.WIDTH, y, color)class MainForm(QDialog): def __init__(self, parent=None): super(MainForm, self).__init__(parent) self.model = BarGraphModel() self.barGraphView = BarGraphView() self.barGraphView.setModel(self.model) self.listView = QListView() self.listView.setModel(self.model) self.listView.setItemDelegate(BarGraphDelegate(0, 1000, self)) self.listView.setMaximumWidth(100) self.listView.setEditTriggers(QListView.DoubleClicked| QListView.EditKeyPressed) layout = QHBoxLayout() layout.addWidget(self.listView) layout.addWidget(self.barGraphView, 1) self.setLayout(layout) self.setWindowTitle("Bar Grapher") QTimer.singleShot(0, self.initialLoad) def initialLoad(self): # Generate fake data count = 20 self.model.insertRows(0, count - 1) for row in range(count): value = random.randint(1, 150) color = QColor(random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)) index = self.model.index(row) self.model.setData(index, value) self.model.setData(index, QVariant(color), Qt.UserRole)app = QApplication(sys.argv)form = MainForm()form.resize(600, 400)form.show()app.exec_() |
运行结果：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/xiaoyangyang20/article/details/70568656
