PySide2绑定模型到vi

2024-05-17 02:34:45 发布

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希望有人能帮我，因为我在网上找不到任何有用的东西。你知道吗

我正在为一个人工智能项目构建一个简单的GUI，并使用PySide2和QML。我已经设法理解了如何将函数绑定到按钮并使其工作。但我似乎不知道如何从python的字符串列表填充组合框（然后在python中使用选择）。我知道它和属性和模型有关，但我不能让它工作。你知道吗

下面是我的python代码：


import multiprocessing as mp
import sys

import mido
from Fuzzy.aidrummer import AiDrummer

from PySide2.QtWidgets import QApplication
from PySide2.QtQuick import QQuickView
from PySide2.QtCore import QUrl, Slot, QObject, Property, Signal

def run():
    d = AiDrummer('playback', file='../Music/28 coltrane 2.mid', play_instrument='yes', instrument_port='VirtualMIDISynth #1 0',
                  out_port='strike 3', visualize=True)
    d.run()


class Api(QObject):
    proc = None

    def __init__(self):
        QObject.__init__(self)
        self._midi_out = mido.get_output_names()
        print(self._midi_out)
        self._midi_in = mido.get_input_names()

    @Slot()
    def play(self):
        self.proc = mp.Process(target=run)
        self.proc.start()

    @Slot()
    def stop(self):
        try:
            assert isinstance(self.proc, mp.Process)
            self.proc.kill()
        except:
            return

    def read_midi_out(self):
        return self._midi_out

    def set_midi_out(self, val):
        self._midi_out = val

    @Signal
    def midi_out_changed(self):
        pass

    midi_out = Property(list, read_midi_out, set_midi_out, notify=midi_out_changed)


if __name__ == '__main__':
    app = QApplication([])
    view = QQuickView()
    view.setResizeMode(QQuickView.SizeRootObjectToView)
    url = QUrl("main.qml")

    api = Api()

    view.setSource(url)
    view.rootContext().setContextProperty('api', api)

    sys.exit(app.exec_())

还有我的主.qml（带模型的组合框靠近底部）：

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.13
import QtQuick.Controls.Material 2.0

Window {
    id: window
    visible: true
    width: 980
    height: 700
    title: qsTr("AI Drummer")

    Rectangle {
        id: rectangle1
        color: "#191919"
        anchors.rightMargin: 0
        anchors.bottomMargin: 0
        anchors.leftMargin: 0
        anchors.topMargin: 0
        anchors.fill: parent
        clip: true
        rotation: 0

        Rectangle {
            id: rectangle
            x: 711
            width: 400
            height: 200
            color: "#3a3a3a"
            anchors.top: parent.top
            anchors.topMargin: -33
            anchors.right: parent.right
            anchors.rightMargin: -131
            rotation: 45
            clip: true
            Material.theme: Material.Dark
            Material.accent: Material.DeepOrange
        }

        RoundButton {
            id: playButton
            x: 356
            y: 632
            width: 100
            text: "Play"
            anchors.bottom: parent.bottom
            anchors.bottomMargin: 28
            anchors.right: parent.horizontalCenter
            anchors.rightMargin: 70
            onClicked: { api.play()}
        }

        RoundButton {
            id: stopButton
            x: 462
            y: 632
            width: 100
            text: "Stop"
            anchors.bottom: parent.bottom
            anchors.bottomMargin: 28
            anchors.right: parent.horizontalCenter
            anchors.rightMargin: -70
            onClicked: { api.stop()}
        }

        ComboBox {
            id: instrument_port
            x: 214
            y: 637
            width: 120
            height: 30
            anchors.right: parent.horizontalCenter
            anchors.rightMargin: 176
            anchors.bottom: parent.bottom
            anchors.bottomMargin: 33
        }

        ComboBox {
            id: out_port
            x: 68
            y: 637
            width: 120
            height: 30
            anchors.bottomMargin: 33
            anchors.right: parent.horizontalCenter
            anchors.rightMargin: 302
            anchors.bottom: parent.bottom
            model: api.midi_out
        }
    }
    Connections {
        target: api
    }
}

Tags： importselfrightapiiddefprocout
1条回答
网友
1楼 · 发布于 2024-05-17 02:34:45

您的代码有以下错误：

  • midi_out属性只能读取和通知，因为您无法写入（创建）midi设备，所以不要实现setter。

  • midi设备的名称仅在开始时获得。如果连接了其他设备呢？我将不得不关闭并重新打开应用程序，而是添加了允许更新设备名称的“reload（）”函数。

  • 如果根元素是Window或ApplicationWindow，则必须使用QQmlApplicationEngine，如果是Item，则必须使用QQuickView。

  • 如果要将PySide2中的列表导出为属性，则必须使用QVariantList（1）

import multiprocessing as mp

import mido

from Fuzzy.aidrummer import AiDrummer

from PySide2.QtWidgets import QApplication
from PySide2.QtQml import QQmlApplicationEngine
from PySide2.QtCore import QUrl, Slot, QObject, Property, Signal


def run():
    d = AiDrummer(
        "playback",
        file="../Music/28 coltrane 2.mid",
        play_instrument="yes",
        instrument_port="VirtualMIDISynth #1 0",
        out_port="strike 3",
        visualize=True,
    )
    d.run()


class Api(QObject):
    midi_in_names_Changed = Signal()
    midi_out_names_Changed = Signal()

    def __init__(self, parent=None):
        super().__init__(parent)

        self.proc = None
        self.reload()

    @Slot()
    def reload(self):
        self._midi_in_names = mido.get_input_names()
        self._midi_out_names = mido.get_output_names()
        self.midi_in_names_Changed.emit()
        self.midi_out_names_Changed.emit()

    def get_midi_in_names(self):
        return self._midi_in_names

    def get_midi_out_names(self):
        return self._midi_out_names

    midi_in_names = Property(
        "QVariantList", fget=get_midi_in_names, notify=midi_in_names_Changed
    )
    midi_out_names = Property(
        "QVariantList", fget=get_midi_out_names, notify=midi_out_names_Changed
    )

    @Slot()
    def play(self):
        self.proc = mp.Process(target=run)
        self.proc.start()

    @Slot()
    def stop(self):
        self.proc.kill()


if __name__ == "__main__":
    import os
    import sys

    app = QApplication(sys.argv)

    api = Api()

    engine = QQmlApplicationEngine()
    engine.rootContext().setContextProperty("api", api)

    current_dir = os.path.dirname(os.path.realpath(__file__))

    url = QUrl.fromLocalFile(os.path.join(current_dir, "main.qml"))

    engine.load(url)

    if not engine.rootObjects():
        sys.exit(-1)

    sys.exit(app.exec_())

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.13
import QtQuick.Controls.Material 2.0

Window {
    id: window
    visible: true
    width: 980
    height: 700
    title: qsTr("AI Drummer")

    Rectangle {
        id: rectangle1
        color: "#191919"
        anchors.rightMargin: 0
        anchors.bottomMargin: 0
        anchors.leftMargin: 0
        anchors.topMargin: 0
        anchors.fill: parent
        clip: true
        rotation: 0

        Rectangle {
            id: rectangle
            x: 711
            width: 400
            height: 200
            color: "#3a3a3a"
            anchors.top: parent.top
            anchors.topMargin: -33
            anchors.right: parent.right
            anchors.rightMargin: -131
            rotation: 45
            clip: true
            Material.theme: Material.Dark
            Material.accent: Material.DeepOrange
        }

        RoundButton {
            id: playButton
            x: 356
            y: 632
            width: 100
            text: "Play"
            anchors.bottom: parent.bottom
            anchors.bottomMargin: 28
            anchors.right: parent.horizontalCenter
            anchors.rightMargin: 70
            onClicked: { api.play()}
        }

        RoundButton {
            id: stopButton
            x: 462
            y: 632
            width: 100
            text: "Stop"
            anchors.bottom: parent.bottom
            anchors.bottomMargin: 28
            anchors.right: parent.horizontalCenter
            anchors.rightMargin: -70
            onClicked: { api.stop()}
        }

        ComboBox {
            id: instrument_port
            x: 214
            y: 637
            width: 120
            height: 30
            anchors.right: parent.horizontalCenter
            anchors.rightMargin: 176
            anchors.bottom: parent.bottom
            anchors.bottomMargin: 33
        }

        ComboBox {
            id: out_port
            x: 68
            y: 637
            width: 120
            height: 30
            anchors.bottomMargin: 33
            anchors.right: parent.horizontalCenter
            anchors.rightMargin: 302
            anchors.bottom: parent.bottom
            model: api.midi_out_names
        }
    }
}

（1）Registering a Python list property to QML in pyside2

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