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python3+PyQt5自定義視圖詳解

2021-02-05 00:05basisworker Python

這篇文章主要為大家詳細介紹了python3+PyQt5自定義視圖的相關資料，具有一定的參考價值，感興趣的小伙伴們可以參考一下

pyqt提供的幾個視圖類都可以較好工作，包括QLisView，QTableView和QTreeView。但是對于一些難以用現有的方式來呈現數據，這時，可以創建我們自己的視圖子類并將其用做模型數據的可視化來解決這一問題。本文通過Python3+pyqt5實現了python Qt GUI 快速編程的16章的例子。

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#!/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_()

運行結果：

python3+PyQt5自定義視圖詳解

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。

原文鏈接：https://blog.csdn.net/xiaoyangyang20/article/details/70242156

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