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本文通过Python3+pyqt5实现了python Qt GUI 快速编程的16章的excise例子。

#!/usr/bin/env python3

import random

import sys

from PyQt5.QtCore import (QAbstractListModel, QAbstractTableModel,

QModelIndex, QSize, QTimer, QVariant, Qt,pyqtSignal)

from PyQt5.QtWidgets import (QApplication, QDialog, QHBoxLayout,

QListView, QSpinBox, QStyledItemDelegate,QStyleOptionViewItem, QWidget)

from PyQt5.QtGui import QColor,QPainter,QPixmap

class BarGraphModel(QAbstractListModel):

dataChanged=pyqtSignal(QModelIndex,QModelIndex)

def __init__(self):

super(BarGraphModel, self).__init__()

self.__data = []

self.__colors = {}

self.minValue = 0

self.maxValue = 0

def rowCount(self, index=QModelIndex()):

return len(self.__data)

def insertRows(self, row, count):

extra = row + count

if extra >= len(self.__data):

self.beginInsertRows(QModelIndex(), row, row + count - 1)

self.__data.extend([0] * (extra - len(self.__data) + 1))

self.endInsertRows()

return True

return False

def flags(self, index):

#return (QAbstractTableModel.flags(self, index)|Qt.ItemIsEditable)

return (QAbstractListModel.flags(self, index)|Qt.ItemIsEditable)

def setData(self, index, value, role=Qt.DisplayRole):

row = index.row()

if not index.isValid() or 0 > row >= len(self.__data):

return False

changed = False

if role == Qt.DisplayRole:

value = value

self.__data[row] = value

if self.minValue > value:

self.minValue = value

if self.maxValue < value:

self.maxValue = value

changed = True

elif role == Qt.UserRole:

self.__colors[row] = value

#self.emit(SIGNAL("dataChanged(QModelIndex,QModelIndex)"),

# index, index)

self.dataChanged[QModelIndex,QModelIndex].emit(index, index)

changed = True

if changed:

#self.emit(SIGNAL("dataChanged(QModelIndex,QModelIndex)"),

# index, index)

self.dataChanged[QModelIndex,QModelIndex].emit(index, index)

return changed

def data(self, index, role=Qt.DisplayRole):

row = index.row()

if not index.isValid() or 0 > row >= len(self.__data):

return QVariant()

if role == Qt.DisplayRole:

return self.__data[row]

if role == Qt.UserRole:

return QVariant(self.__colors.get(row,

QColor(Qt.red)))

if role == Qt.DecorationRole:

color = QColor(self.__colors.get(row,

QColor(Qt.red)))

pixmap = QPixmap(20, 20)

pixmap.fill(color)

return QVariant(pixmap)

return QVariant()

class BarGraphDelegate(QStyledItemDelegate):

def __init__(self, minimum=0, maximum=100, parent=None):

super(BarGraphDelegate, self).__init__(parent)

self.minimum = minimum

self.maximum = maximum

def paint(self, painter, option, index):

myoption = QStyleOptionViewItem(option)

myoption.displayAlignment |= (Qt.AlignRight|Qt.AlignVCenter)

QStyledItemDelegate.paint(self, painter, myoption, index)

def createEditor(self, parent, option, index):

spinbox = QSpinBox(parent)

spinbox.setRange(self.minimum, self.maximum)

spinbox.setAlignment(Qt.AlignRight|Qt.AlignVCenter)

return spinbox

def setEditorData(self, editor, index):

value = index.model().data(index, Qt.DisplayRole)

editor.setValue(value)

def setModelData(self, editor, model, index):

editor.interpretText()

model.setData(index, editor.value())

class BarGraphView(QWidget):

WIDTH = 20

def __init__(self, parent=None):

super(BarGraphView, self).__init__(parent)

self.model = None

def setModel(self, model):

self.model = model

#self.connect(self.model,

# SIGNAL("dataChanged(QModelIndex,QModelIndex)"),

# self.update)

self.model.dataChanged[QModelIndex,QModelIndex].connect(self.update)

#self.connect(self.model, SIGNAL("modelReset()"), self.update)

self.model.modelReset.connect(self.update)

def sizeHint(self):

return self.minimumSizeHint()

def minimumSizeHint(self):

if self.model is None:

return QSize(BarGraphView.WIDTH * 10, 100)

return QSize(BarGraphView.WIDTH * self.model.rowCount(), 100)

def paintEvent(self, event):

if self.model is None:

return

painter = QPainter(self)

painter.setRenderHint(QPainter.Antialiasing)

span = self.model.maxValue - self.model.minValue

painter.setWindow(0, 0, BarGraphView.WIDTH * self.model.rowCount(),

span)

for row in range(self.model.rowCount()):

x = row * BarGraphView.WIDTH

index = self.model.index(row)

color = QColor(self.model.data(index, Qt.UserRole))

y = self.model.data(index)

painter.fillRect(x, span - y, BarGraphView.WIDTH, y, color)

class MainForm(QDialog):

def __init__(self, parent=None):

super(MainForm, self).__init__(parent)

self.model = BarGraphModel()

self.barGraphView = BarGraphView()

self.barGraphView.setModel(self.model)

self.listView = QListView()

self.listView.setModel(self.model)

self.listView.setItemDelegate(BarGraphDelegate(0, 1000, self))

self.listView.setMaximumWidth(100)

self.listView.setEditTriggers(QListView.DoubleClicked|

QListView.EditKeyPressed)

layout = QHBoxLayout()

layout.addWidget(self.listView)

layout.addWidget(self.barGraphView, 1)

self.setLayout(layout)

self.setWindowTitle("Bar Grapher")

QTimer.singleShot(0, self.initialLoad)

def initialLoad(self):

# Generate fake data

count = 20

self.model.insertRows(0, count - 1)

for row in range(count):

value = random.randint(1, 150)

color = QColor(random.randint(0, 255), random.randint(0, 255),

random.randint(0, 255))

index = self.model.index(row)

self.model.setData(index, value)

self.model.setData(index, QVariant(color), Qt.UserRole)

app = QApplication(sys.argv)

form = MainForm()

form.resize(600, 400)

form.show()

app.exec_()

运行结果：

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