pyqt提供的几个视图类都可以较好工作，包括QLisView，QTableView和QTreeView。但是对于一些难以用现有的方式来呈现数据，这时，可以创建我们自己的视图子类并将其用做模型数据的可视化来解决这一问题。本文通过Python3+pyqt5实现了python Qt GUI 快速编程的16章的例子。
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#!/usr/bin/env python3import gzipimport osimport platformimport sys QSize, QTimer, QVariant, Qt,pyqtSignal)from PyQt5.QtGui import ( QColor, QCursor, QFont, QFontDatabase, QFontMetrics, QPainter, QPalette, QPixmap)from PyQt5.QtWidgets import QApplication,QDialog,QHBoxLayout, QLabel, QMessageBox,QScrollArea, QSplitter, QTableView,QWidget(TIMESTAMP, TEMPERATURE, INLETFLOW, TURBIDITY, CONDUCTIVITY, COAGULATION, RAWPH, FLOCCULATEDPH) = range(8)TIMESTAMPFORMAT = "yyyy-MM-dd hh:mm"class WaterQualityModel(QAbstractTableModel): def __init__(self, filename): super(WaterQualityModel, self).__init__() self.filename = filename self.results = [] def load(self): self.beginResetModel() exception = None fh = None try: if not self.filename: raise IOError("no filename specified for loading") self.results = [] line_data = gzip.open(self.filename).read() for line in line_data.decode("utf8").splitlines(): parts = line.rstrip().split(",") date = QDateTime.fromString(parts[0] + ":00", Qt.ISODate) result = [date] for part in parts[1:]: result.append(float(part)) self.results.append(result) except (IOError, ValueError) as e: exception = e finally: if fh is not None: fh.close() self.endResetModel() if exception is not None: raise exception def data(self, index, role=Qt.DisplayRole): if (not index.isValid() or not (0 <= index.row() < len(self.results))): return QVariant() column = index.column() result = self.results[index.row()] if role == Qt.DisplayRole: item = result[column] if column == TIMESTAMP: #item = item.toString(TIMESTAMPFORMAT) item=item else: #item = QString("%1").arg(item, 0, "f", 2) item = "{0:.2f}".format(item) return item elif role == Qt.TextAlignmentRole: if column != TIMESTAMP: return QVariant(int(Qt.AlignRight|Qt.AlignVCenter)) return QVariant(int(Qt.AlignLeft|Qt.AlignVCenter)) elif role == Qt.TextColorRole and column == INLETFLOW: if result[column] < 0: return QVariant(QColor(Qt.red)) elif (role == Qt.TextColorRole and column in (RAWPH, FLOCCULATEDPH)): ph = result[column] if ph < 7: return QVariant(QColor(Qt.red)) elif ph >= 8: return QVariant(QColor(Qt.blue)) else: return QVariant(QColor(Qt.darkGreen)) return QVariant() def headerData(self, section, orientation, role=Qt.DisplayRole): if role == Qt.TextAlignmentRole: if orientation == Qt.Horizontal: return QVariant(int(Qt.AlignCenter)) return QVariant(int(Qt.AlignRight|Qt.AlignVCenter)) if role != Qt.DisplayRole: return QVariant() if orientation == Qt.Horizontal: if section == TIMESTAMP: return "Timestamp" elif section == TEMPERATURE: return "\u00B0" +"C" elif section == INLETFLOW: return "Inflow" elif section == TURBIDITY: return "NTU" elif section == CONDUCTIVITY: return "\u03BCS/cm" elif section == COAGULATION: return "mg/L" elif section == RAWPH: return "Raw Ph" elif section == FLOCCULATEDPH: return "Floc Ph" return int(section + 1) def rowCount(self, index=QModelIndex()): return len(self.results) def columnCount(self, index=QModelIndex()): return 8class WaterQualityView(QWidget): clicked = pyqtSignal(QModelIndex) FLOWCHARS = (chr(0x21DC), chr(0x21DD), chr(0x21C9)) def __init__(self, parent=None): super(WaterQualityView, self).__init__(parent) self.scrollarea = None self.model = None self.setFocusPolicy(Qt.StrongFocus) self.selectedRow = -1 self.flowfont = self.font() size = self.font().pointSize() if platform.system() == "Windows": fontDb = QFontDatabase() for face in [face.toLower() for face in fontDb.families()]: if face.contains("unicode"): self.flowfont = QFont(face, size) break else: self.flowfont = QFont("symbol", size) WaterQualityView.FLOWCHARS = (chr(0xAC), chr(0xAE), chr(0xDE)) def setModel(self, model): self.model = model #self.connect(self.model, # SIGNAL("dataChanged(QModelIndex,QModelIndex)"), # self.setNewSize) self.model.dataChanged.connect(self.setNewSize) #self.connect(self.model, SIGNAL("modelReset()"), self.setNewSize) self.model.modelReset.connect(self.setNewSize) self.setNewSize() def setNewSize(self): self.resize(self.sizeHint()) self.update() self.updateGeometry() def minimumSizeHint(self): size = self.sizeHint() fm = QFontMetrics(self.font()) size.setHeight(fm.height() * 3) return size def sizeHint(self): fm = QFontMetrics(self.font()) size = fm.height() return QSize(fm.width("9999-99-99 99:99 ") + (size * 4), (size / 4) + (size * self.model.rowCount())) def paintEvent(self, event): if self.model is None: return fm = QFontMetrics(self.font()) timestampWidth = fm.width("9999-99-99 99:99 ") size = fm.height() indicatorSize = int(size * 0.8) offset = int(1.5 * (size - indicatorSize)) minY = event.rect().y() maxY = minY + event.rect().height() + size minY -= size painter = QPainter(self) painter.setRenderHint(QPainter.Antialiasing) painter.setRenderHint(QPainter.TextAntialiasing) y = 0 for row in range(self.model.rowCount()): x = 0 if minY <= y <= maxY: painter.save() painter.setPen(self.palette().color(QPalette.Text)) if row == self.selectedRow: painter.fillRect(x, y + (offset * 0.8), self.width(), size, self.palette().highlight()) painter.setPen(self.palette().color( QPalette.HighlightedText)) #timestamp = self.model.data( #self.model.index(row, TIMESTAMP)).toDateTime() timestamp = self.model.data(self.model.index(row, TIMESTAMP)) painter.drawText(x, y + size, timestamp.toString(TIMESTAMPFORMAT)) #print(timestamp.toString(TIMESTAMPFORMAT)) x += timestampWidth temperature = self.model.data( self.model.index(row, TEMPERATURE)) #temperature = temperature.toDouble()[0] temperature = float(temperature) if temperature < 20: color = QColor(0, 0, int(255 * (20 - temperature) / 20)) elif temperature > 25: color = QColor(int(255 * temperature / 100), 0, 0) else: color = QColor(0, int(255 * temperature / 100), 0) painter.setPen(Qt.NoPen) painter.setBrush(color) painter.drawEllipse(x, y + offset, indicatorSize, indicatorSize) x += size rawPh = self.model.data(self.model.index(row, RAWPH)) #rawPh = rawPh.toDouble()[0] rawPh = float(rawPh) if rawPh < 7: color = QColor(int(255 * rawPh / 10), 0, 0) elif rawPh >= 8: color = QColor(0, 0, int(255 * rawPh / 10)) else: color = QColor(0, int(255 * rawPh / 10), 0) painter.setBrush(color) painter.drawEllipse(x, y + offset, indicatorSize, indicatorSize) x += size flocPh = self.model.data( self.model.index(row, FLOCCULATEDPH)) #flocPh = flocPh.toDouble()[0] flocPh = float(flocPh) if flocPh < 7: color = QColor(int(255 * flocPh / 10), 0, 0) elif flocPh >= 8: color = QColor(0, 0, int(255 * flocPh / 10)) else: color = QColor(0, int(255 * flocPh / 10), 0) painter.setBrush(color) painter.drawEllipse(x, y + offset, indicatorSize, indicatorSize) painter.restore() painter.save() x += size flow = self.model.data( self.model.index(row, INLETFLOW)) #flow = flow.toDouble()[0] flow = float(flow) char = None if flow <= 0: char = WaterQualityView.FLOWCHARS[0] elif flow < 3.6: char = WaterQualityView.FLOWCHARS[1] elif flow > 4.7: char = WaterQualityView.FLOWCHARS[2] if char is not None: painter.setFont(self.flowfont) painter.drawText(x, y + size, char) painter.restore() y += size if y > maxY: break def mousePressEvent(self, event): fm = QFontMetrics(self.font()) self.selectedRow = event.y() // fm.height() self.update() #self.emit(SIGNAL("clicked(QModelIndex)"), # self.model.index(self.selectedRow, 0)) self.clicked.emit(self.model.index(self.selectedRow, 0)) def keyPressEvent(self, event): if self.model is None: return row = -1 if event.key() == Qt.Key_Up: row = max(0, self.selectedRow - 1) elif event.key() == Qt.Key_Down: row = min(self.selectedRow + 1, self.model.rowCount() - 1) if row != -1 and row != self.selectedRow: self.selectedRow = row if self.scrollarea is not None: fm = QFontMetrics(self.font()) y = fm.height() * self.selectedRow print(y) self.scrollarea.ensureVisible(0, y) self.update() #self.emit(SIGNAL("clicked(QModelIndex)"), # self.model.index(self.selectedRow, 0)) self.clicked.emit(self.model.index(self.selectedRow, 0)) else: QWidget.keyPressEvent(self, event)class MainForm(QDialog): def __init__(self, parent=None): super(MainForm, self).__init__(parent) self.model = WaterQualityModel(os.path.join( os.path.dirname(__file__), "waterdata.csv.gz")) self.tableView = QTableView() self.tableView.setAlternatingRowColors(True) self.tableView.setModel(self.model) self.waterView = WaterQualityView() self.waterView.setModel(self.model) scrollArea = QScrollArea() scrollArea.setBackgroundRole(QPalette.Light) scrollArea.setWidget(self.waterView) self.waterView.scrollarea = scrollArea splitter = QSplitter(Qt.Horizontal) splitter.addWidget(self.tableView) splitter.addWidget(scrollArea) splitter.setSizes([600, 250]) layout = QHBoxLayout() layout.addWidget(splitter) self.setLayout(layout) self.setWindowTitle("Water Quality Data") QTimer.singleShot(0, self.initialLoad) def initialLoad(self): QApplication.setOverrideCursor(QCursor(Qt.WaitCursor)) splash = QLabel(self) pixmap = QPixmap(os.path.join(os.path.dirname(__file__), "iss013-e-14802.jpg")) #print(os.path.join(os.path.dirname(__file__), # "iss013-e-14802.jpg")) splash.setPixmap(pixmap) splash.setWindowFlags(Qt.SplashScreen) splash.move(self.x() + ((self.width() - pixmap.width()) / 2), self.y() + ((self.height() - pixmap.height()) / 2)) splash.show() QApplication.processEvents() try: self.model.load() except IOError as e: QMessageBox.warning(self, "Water Quality - Error", e) else: self.tableView.resizeColumnsToContents() splash.close() QApplication.processEvents() QApplication.restoreOverrideCursor()app = QApplication(sys.argv)form = MainForm()form.resize(850, 620)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/70242156
