Heim > Artikel > Backend-Entwicklung > Detaillierte Erläuterung der benutzerdefinierten Python3+PyQt5-Ansicht
In diesem Artikel werden hauptsächlich die relevanten Informationen zu benutzerdefinierten Python3 + PyQt5-Ansichten ausführlich vorgestellt, die einen gewissen Referenzwert haben. Interessierte Freunde können sich auf
Mehrere von pyqt bereitgestellte Ansichtsklassen beziehen, die alle gut funktionieren, einschließlich QLisView und QTableView und QTreeView. Aber für einige Daten, die auf bestehende Weise schwer darzustellen sind, können wir unsere eigene Ansichtsunterklasse erstellen und diese zur Visualisierung von Modelldaten verwenden, um dieses Problem zu lösen. Dieser Artikel implementiert 16 Kapitel von Python Qt GUI-Schnellprogrammierbeispielen über Python3 + pyqt5.
#!/usr/bin/env python3 import gzip import os import platform import sys from PyQt5.QtCore import (QAbstractTableModel, QDateTime, QModelIndex, 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 8 class 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_()
Laufergebnisse:
Verwandte Empfehlungen:
Python3+PyQt5 implementiert ein Histogramm
Python3+PyQt5 implementiert eine Dokumentendruckfunktion
Python3+PyQt5 implementiert eine Multithread-Seitenindexer-App
Das obige ist der detaillierte Inhalt vonDetaillierte Erläuterung der benutzerdefinierten Python3+PyQt5-Ansicht. Für weitere Informationen folgen Sie bitte anderen verwandten Artikeln auf der PHP chinesischen Website!