我想在 QlistView 中显示索引和文件名，所以我将 QSqlQueryModel 子类化以覆盖 data() 方法，但我总是得到无，似乎我在添加数据之前显示数据或类似的东西这是我的代码的相关部分：
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtSql import *
import sys, os
import pathlib
CURRENT_PATH = pathlib.Path(__file__).parent
connection = QSqlDatabase.addDatabase("QSQLITE")
connection.setDatabaseName("medias.sqlite")
connection.open()
print(connection.open())
createTableQuery = QSqlQuery()
createTableQuery.exec(
"""
CREATE TABLE fichiers (
id INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE NOT NULL,
path VARCHAR(300) NOT NULL
)
"""
)
print(connection.tables())
class PlaylistModel(QSqlQueryModel):
def __init__(self, playlist,*args, **kwargs):
super(PlaylistModel, self).__init__(*args, **kwargs)
self.playlist = playlist or [[]]
def data(self, index, role):
row = index.row()
if role == Qt.DisplayRole:
try:
text = self.playlist[index.row()][1]
except IndexError:
text = None
return text # always getting None
class MainWindow(QMainWindow):
def __init__(self, *args, **kwargs):
super(MainWindow, self).__init__(*args, **kwargs)
self.play_list = []
self.setGeometry(900,180,800,600)
self.setWindowTitle("Media Display")
self.model = PlaylistModel(self.play_list)
self.model.setQuery("SELECT path FROM fichiers")
self.listview = QListView()
self.listview.setModel(self.model)
self.listview.setModelColumn(1)
self.main_layout()
self.DbConnect()
def DbConnect(self):
self.connection = QSqlDatabase.addDatabase("QSQLITE")
self.connection.setDatabaseName("medias.sqlite")
self.connection.open()
createTableQuery = QSqlQuery()
createTableQuery.exec(
""" CREATE TABLE fichiers (
id INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE NOT NULL,
path VARCHAR(300) NOT NULL
)
"""
)
self.model.setQuery("SELECT path FROM fichiers")
return True
def addToPlaylist(self):
self.play_list.clear()
model = self.listview.model()
for row in range(model.rowCount()):
index = model.index(row , 0)
item = model.data(index, Qt.DisplayRole)
self.play_list.append(item)
print('the playlist',self.play_list)
def addImage(self):
fichier_base, _ = QFileDialog.getOpenFileName(self, 'select video', QDir.homePath(),"Images (*.png *.xpm *.jpg *.jpeg)")
if fichier_base:
query = QSqlQuery()
query.prepare("""INSERT INTO fichiers (path) VALUES (?)""")
query.addBindValue(fichier_base)
if query.exec_():
last_query = self.model.query().executedQuery()
self.model.setQuery("")
self.model.setQuery(last_query)
else:
print(query.lastError().text())
def clearDb(self):
query = QSqlQuery(self.connection)
if self.connection.open():
query.exec("DELETE FROM fichiers")
query.clear()
last_query = self.model.query().executedQuery()
self.model.setQuery("")
self.model.setQuery(last_query)
def main_layout(self):
self.add_img_btn = QPushButton("Add image ")
self.add_img_btn.setFixedWidth(150)
self.add_img_btn.clicked.connect(self.addImage)
self.clear_db_btn = QPushButton("clear DB")
self.clear_db_btn.setFixedWidth(150)
self.clear_db_btn.clicked.connect(self.clearDb)
self.refresh_btn = QPushButton("refresh")
self.refresh_btn.setFixedWidth(150)
self.refresh_btn.clicked.connect(self.addToPlaylist)
group_btns = QHBoxLayout()
main_app = QVBoxLayout()
main_app.addWidget(self.listview)
main_app.addLayout(group_btns)
group_btns.addWidget(self.add_img_btn)
group_btns.addWidget(self.clear_db_btn)
group_btns.addWidget(self.refresh_btn)
vboxlay = QHBoxLayout()
vboxlay.addLayout(main_app)
widget = QWidget(self)
self.setCentralWidget(widget)
widget.setLayout(vboxlay)
if __name__ == '__main__':
app= QApplication(sys.argv)
window = MainWindow()
window.setStyleSheet('background-color:#fff;')
window.show()
sys.exit(app.exec_())
在以前的应用程序中，我对 QAbstractListModel 类进行了子类化，我就这样做了
class PlaylistModel(QAbstractListModel):
def __init__(self, playlist, *args, **kwargs):
super(PlaylistModel, self).__init__(*args, **kwargs)
self.playlist = playlist
def data(self, index, role):
if role == Qt.DisplayRole:
media = self.playlist.media(index.row())
print('mediaaaaaaa', media )
print('plaaaaaylist', self.playlist )
name_video = media.canonicalUrl().fileName()
i = index.row() + 1
return f"{i} - {name_video}"
def rowCount(self, index):
return self.playlist.mediaCount()