DDR爱好者之家 Design By 杰米
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。
#!/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_()
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。
DDR爱好者之家 Design By 杰米
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DDR爱好者之家 Design By 杰米
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稳了！魔兽国服回归的3条重磅消息！官宣时间再确认！
昨天有一位朋友在大神群里分享，自己亚服账号被封号之后居然弹出了国服的封号信息对话框。
这里面让他访问的是一个国服的战网网址，com.cn和后面的zh都非常明白地表明这就是国服战网。
而他在复制这个网址并且进行登录之后，确实是网易的网址，也就是我们熟悉的停服之后国服发布的暴雪游戏产品运营到期开放退款的说明。这是一件比较奇怪的事情，因为以前都没有出现这样的情况，现在突然提示跳转到国服战网的网址，是不是说明了简体中文客户端已经开始进行更新了呢？
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