This article mainly introduces the relevant information of python3 PyQt5 custom views in detail. It has certain reference value. Interested friends can refer to the several view classes provided by
pyqt. Can work better, including QLisView, QTableView and QTreeView. But for some data that are difficult to present in existing ways, we can create our own view subclass and use it for visualization of model data to solve this problem. This article implements 16 chapters of python Qt GUI rapid programming examples through 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_()Run results:
python3 PyQt5 implements histogram
python3 PyQt5 implements document printing function
python3 PyQt5 implements page indexer application that supports multi-threading
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