【发布时间】：2021-01-06 13:10:49
【问题描述】：
我能够加载 csv 文件并将其显示为 Python QML QT GUI 中的 Tableview。 示例 tabview.py 如下
from os.path import dirname, realpath, join
from PySide2.QtWidgets import QApplication, QWidget
from PySide2.QtCore import QFile
from PySide2.QtUiTools import QUiLoader
from PySide2.QtUiTools import *
from PySide2.QtCore import QFile
from PySide2.QtUiTools import *
import numpy as np
import pandas as pd
scriptDir = dirname(realpath(__file__))
class DataFrameModel(QtCore.QAbstractTableModel):
DtypeRole = QtCore.Qt.UserRole + 1000
ValueRole = QtCore.Qt.UserRole + 1001
def __init__(self, df=pd.DataFrame(), parent=None):
super(DataFrameModel, self).__init__(parent)
self._dataframe = df
def setDataFrame(self, dataframe):
self.beginResetModel()
self._dataframe = dataframe.copy()
self.endResetModel()
def dataFrame(self):
return self._dataframe
dataFrame = QtCore.pyqtProperty(pd.DataFrame, fget=dataFrame, fset=setDataFrame)
@QtCore.pyqtSlot(int, QtCore.Qt.Orientation, result=str)
def headerData(self, section: int, orientation: QtCore.Qt.Orientation, role: int = QtCore.Qt.DisplayRole):
if role == QtCore.Qt.DisplayRole:
if orientation == QtCore.Qt.Horizontal:
return self._dataframe.columns[section]
else:
return str(self._dataframe.index[section])
return QtCore.QVariant()
def rowCount(self, parent=QtCore.QModelIndex()):
if parent.isValid():
return 0
return len(self._dataframe.index)
def columnCount(self, parent=QtCore.QModelIndex()):
if parent.isValid():
return 0
return self._dataframe.columns.size
def data(self, index, role=QtCore.Qt.DisplayRole):
if not index.isValid() or not (0 <= index.row() < self.rowCount() \
and 0 <= index.column() < self.columnCount()):
return QtCore.QVariant()
row = self._dataframe.index[index.row()]
col = self._dataframe.columns[index.column()]
dt = self._dataframe[col].dtype
val = self._dataframe.iloc[row][col]
if role == QtCore.Qt.DisplayRole:
return str(val)
elif role == DataFrameModel.ValueRole:
return val
if role == DataFrameModel.DtypeRole:
return dt
return QtCore.QVariant()
def roleNames(self):
roles = {
QtCore.Qt.DisplayRole: b'display',
DataFrameModel.DtypeRole: b'dtype',
DataFrameModel.ValueRole: b'value'
}
return roles
if __name__ == "__main__":
import os
import sys
app = QtGui.QGuiApplication(sys.argv)
path = "C:/Users/kalya/Documents/untitled7/tele.csv"
df = pd.read_csv(path)
print(df)
model = DataFrameModel(df)
engine = QtQml.QQmlApplicationEngine()
engine.rootContext().setContextProperty("table_model", model)
qml_path = os.path.join(os.path.dirname(__file__), "main.qml")
engine.load(QtCore.QUrl.fromLocalFile(qml_path))
if not engine.rootObjects():
sys.exit(-1)
engine.quit.connect(app.quit)
sys.exit(app.exec_())
这是 tabview.qml
import QtQuick 2.12
import QtQuick.Controls 2.4
import QtQuick.Window 2.11
Window {
visible: true
width: 800
height: 480
title: qsTr("Load CSV")
color: '#222222'
TableView {
id: tableView
columnWidthProvider: function (column) { return 100; }
rowHeightProvider: function (column) { return 60; }
anchors.fill: parent
leftMargin: rowsHeader.implicitWidth
topMargin: columnsHeader.implicitHeight
model: table_model
delegate: Rectangle {
color: parseFloat(display) > 100 ? 'grey' : 'black'
Text {
text: display
anchors.fill: parent
anchors.margins: 10
color: 'white'
font.pixelSize: 10
verticalAlignment: Text.AlignVCenter
}
}
Rectangle { // mask the headers
z: 3
color: "#222222"
y: tableView.contentY
x: tableView.contentX
width: tableView.leftMargin
height: tableView.topMargin
}
Row {
id: columnsHeader
y: tableView.contentY
z: 2
Repeater {
model: tableView.columns > 0 ? tableView.columns : 1
Label {
width: tableView.columnWidthProvider(modelData)
height: 35
text: table_model.headerData(modelData, Qt.Horizontal)
color: '#aaaaaa'
font.pixelSize: 15
padding: 10
verticalAlignment: Text.AlignVCenter
background: Rectangle { color: "#333333" }
}
}
}
Column {
id: rowsHeader
x: tableView.contentX
z: 2
Repeater {
model: tableView.rows > 0 ? tableView.rows : 1
Label {
width: 40
height: tableView.rowHeightProvider(modelData)
text: table_model.headerData(modelData, Qt.Vertical)
color: '#aaaaaa'
font.pixelSize: 15
padding: 10
verticalAlignment: Text.AlignVCenter
background: Rectangle { color: "#333333" }
}
}
}
ScrollIndicator.horizontal: ScrollIndicator { }
ScrollIndicator.vertical: ScrollIndicator { }
}
}
当我使用与在 stackview 中显示相同的上述文件时，将 main.py 和 main.qml 重命名为 tabview.py和 tabview.qml 并从下面的 main.qml 加载它们
import QtQuick 2.15
import QtQuick.Window 2.15
import QtQuick.Controls 2.15
import QtGraphicalEffects 1.15
Window {
id: window
width: 640
height: 480
visible: true
color: "#000000"
title: qsTr("Hello World")
Button {
id: btnLoad
text: qsTr("Main")
anchors.left: parent.left
anchors.right: stackView.left
anchors.top: parent.top
anchors.rightMargin: 0
anchors.leftMargin: 0
anchors.topMargin: 8
onClicked: {
stackView.push(Qt.resolvedUrl("settingsPage.qml"))
}
}
Button {
id: btnmain
text: qsTr("Load")
anchors.left: parent.left
anchors.right: stackView.left
anchors.top: parent.top
anchors.rightMargin: 0
anchors.leftMargin: 0
anchors.topMargin: 66
onClicked: stackView.push(Qt.resolvedUrl("tabview.qml"))
}
StackView {
id: stackView
x: 112
width: 510
anchors.right: parent.right
anchors.top: parent.top
anchors.bottom: parent.bottom
anchors.bottomMargin: 0
anchors.rightMargin: 0
anchors.topMargin: 0
initialItem: Qt.resolvedUrl("settingsPage.qml")
}
Connections{
target:backend}
}
csv 无法加载。它抛出错误 file:///C:/Users/luffy/Documents/QTapp/qml/pages/tabview.qml:17: ReferenceError: table_model is not defined
main.py如下
import sys
import os
import datetime
from os.path import dirname, realpath, join
from PySide2.QtWidgets import QApplication, QWidget
from PySide2.QtCore import QFile
from PySide2.QtUiTools import *
from PyQt5 import QtCore, QtGui, QtQml
from PySide2.QtCore import QFile
from PySide2.QtUiTools import *
import numpy as np
import pandas as pd
import tabview
from PySide2.QtGui import QGuiApplication
from PySide2.QtQml import QQmlApplicationEngine
from PySide2.QtCore import QObject, Slot, Signal, QTimer, QUrl
from PySide2.QtWidgets import QApplication, QMainWindow
from PySide2.QtCore import QFile
class MainWindow(QObject):
def __init__(self):
QObject.__init__(self)
if __name__ == "__main__":
app = QGuiApplication(sys.argv)
engine = QQmlApplicationEngine()
engine.load(os.path.join(os.path.dirname(__file__), "main.qml"))
main = MainWindow()
engine.rootContext().setContextProperty("backend", main)
if not engine.rootObjects():
sys.exit(-1)
sys.exit(app.exec_())
我做错了什么？ 有没有其他方法可以使用 python 加载 csv 并在 QML QT GUI 中显示？
【问题讨论】：
-
同时删除
from PyQt5 import QtCore, QtGui, QtQml -
我要求您提供 MRE，因为您的代码似乎正确（模型和您导出它的方式）所以问题出在您未提供的代码部分
-
有没有办法捕获其他 .qml 和 .py 文件的输出并将其作为 stackview 发布到 main.qml 文件中？
-
不，那不是MRE，显然代码甚至无法执行，因为有许多未定义的元素，例如main.py中的
stackView没有定义
标签： python qt qml qtableview