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Raspbian 上的 PyQt5：不顯示 QWidgets 的背景顏色

[英]PyQt5 on Raspbian: Background color of QWidgets is not displayed

 原文  2019-08-24 11:29:25  0   2    python/ pyqt/ pyqt5/ raspbian/ qtstylesheets

問題描述

我已經編制並在樹莓派3B +安裝PyQt5運行Raspbian巴斯特等中描述的在這里。 花了幾個小時，但它奏效了。 之后，我上傳了由 2 個文件（ main.py和mainwindow.ui ）組成的簡單 PyQt 示例程序。

為QProgressBar和QPushButton設置的紅色背景顏色在運行 Ubuntu 18.04 LTS 的 PC 上以不同深淺的紅色 (?) 顯示，但在 Raspberry Pi 上根本不顯示。

Raspbian Buster 上的終端輸出：

libEGL warning: DRI2: failed to authenticate
qt5ct: using qt5ct plugin
qt5ct: D-Bus global menu: no

Ubuntu 18.04 LTS 上的屏幕截圖： Ubuntu 18.04 LTS 上簡單 PyQt 示例程序的屏幕截圖

Raspbian Buster 上的截圖： Raspbian Buster 上簡單 PyQt 示例程序的屏幕截圖

為什么在 Raspbian Buster 上不顯示紅色背景色？

主文件

import sys
from pathlib import Path
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.QtGui import QColor
from PyQt5.uic import loadUi


class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        ui_file = (Path(__file__).parent / "mainwindow.ui").resolve()
        loadUi(ui_file, self)
        self.progressBar.setStyleSheet(f"background-color: {QColor('red').name()}")


def main():
    app = QApplication(sys.argv)
    main_window = MainWindow()
    main_window.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

主窗口.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>200</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <property name="locale">
   <locale language="English" country="UnitedKingdom"/>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QGridLayout" name="gridLayout_2">
    <item row="0" column="0">
     <layout class="QGridLayout" name="gridLayout">
      <item row="0" column="0">
       <widget class="QProgressBar" name="progressBar">
        <property name="value">
         <number>0</number>
        </property>
       </widget>
      </item>
      <item row="0" column="1">
       <widget class="QPushButton" name="pushButton">
        <property name="minimumSize">
         <size>
          <width>200</width>
          <height>0</height>
         </size>
        </property>
        <property name="styleSheet">
         <string notr="true">background-color: red;</string>
        </property>
        <property name="text">
         <string>Button</string>
        </property>
       </widget>
      </item>
     </layout>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>28</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

設置export QT_DEBUG_PLUGINS=1后 Raspbian Buster 上的終端輸出：

QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqeglfs.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqminimal.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqminimalegl.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqoffscreen.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqvnc.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqxcb.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...
loaded library "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforms/libqxcb.so"
loaded library "Xcursor"
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/arm-linux-gnueabihf/qt5/plugins/xcbglintegrations" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/xcbglintegrations/libqxcb-egl-integration.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/xcbglintegrations/libqxcb-egl-integration.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.Xcb.QXcbGlIntegrationFactoryInterface.5.5",
    "MetaData": {
        "Keys": [
            "xcb_egl"
        ]
    },
    "className": "QXcbEglIntegrationPlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("xcb_egl")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/xcbglintegrations" ...
loaded library "/usr/lib/arm-linux-gnueabihf/qt5/plugins/xcbglintegrations/libqxcb-egl-integration.so"
libEGL warning: DRI2: failed to authenticate
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platformthemes" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platformthemes/libqgtk2.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/platformthemes/libqgtk2.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "gtk2"
        ]
    },
    "className": "QGtk2ThemePlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("gtk2")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platformthemes/libqgtk3.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/platformthemes/libqgtk3.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "gtk3"
        ]
    },
    "className": "QGtk3ThemePlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("gtk3")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platformthemes/libqt5ct.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/platformthemes/libqt5ct.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "qt5ct"
        ]
    },
    "className": "Qt5CTPlatformThemePlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("qt5ct")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platformthemes" ...
loaded library "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platformthemes/libqt5ct.so"
qt5ct: using qt5ct plugin
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/arm-linux-gnueabihf/qt5/plugins/styles" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libbb10styleplugin.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libbb10styleplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QStyleFactoryInterface",
    "MetaData": {
        "Keys": [
            "bb10bright",
            "bb10dark"
        ]
    },
    "className": "QBB10StylePlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("bb10bright", "bb10dark")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libqcleanlooksstyle.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libqcleanlooksstyle.so, metadata=
{
    "IID": "org.qt-project.Qt.QStyleFactoryInterface",
    "MetaData": {
        "Keys": [
            "cleanlooks"
        ]
    },
    "className": "QCleanlooksStylePlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("cleanlooks")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libqgtk2style.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libqgtk2style.so, metadata=
{
    "IID": "org.qt-project.Qt.QStyleFactoryInterface",
    "MetaData": {
        "Keys": [
            "gtk2"
        ]
    },
    "className": "QGtk2StylePlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("gtk2")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libqmotifstyle.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libqmotifstyle.so, metadata=
{
    "IID": "org.qt-project.Qt.QStyleFactoryInterface",
    "MetaData": {
        "Keys": [
            "motif",
            "cde"
        ]
    },
    "className": "QMotifStylePlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("motif", "cde")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libqplastiquestyle.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libqplastiquestyle.so, metadata=
{
    "IID": "org.qt-project.Qt.QStyleFactoryInterface",
    "MetaData": {
        "Keys": [
            "plastique"
        ]
    },
    "className": "QPlastiqueStylePlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("plastique")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libqt5ct-style.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libqt5ct-style.so, metadata=
{
    "IID": "org.qt-project.Qt.QStyleFactoryInterface",
    "MetaData": {
        "Keys": [
            "qt5ct-style"
        ]
    },
    "className": "Qt5CTStylePlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("qt5ct-style")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/styles" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforminputcontexts" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "compose",
            "xim"
        ]
    },
    "className": "QComposePlatformInputContextPlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("compose", "xim")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "ibus"
        ]
    },
    "className": "QIbusPlatformInputContextPlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("ibus")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforminputcontexts" ...
loaded library "/usr/lib/arm-linux-gnueabihf/qt5/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so"
loaded library "/usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libqt5ct-style.so"
loaded library "/usr/lib/arm-linux-gnueabihf/qt5/plugins/styles/libqgtk2style.so"
Cannot load library gtk-x11-2.0: (gtk-x11-2.0: Kann die Shared-Object-Datei nicht öffnen: Datei oder Verzeichnis nicht gefunden)
qt5ct: D-Bus global menu: no
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/arm-linux-gnueabihf/qt5/plugins/iconengines" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/arm-linux-gnueabihf/qt5/plugins/iconengines/libqsvgicon.so"
Found metadata in lib /usr/lib/arm-linux-gnueabihf/qt5/plugins/iconengines/libqsvgicon.so, metadata=
{
    "IID": "org.qt-project.Qt.QIconEngineFactoryInterface",
    "MetaData": {
        "Keys": [
            "svg",
            "svgz",
            "svg.gz"
        ]
    },
    "className": "QSvgIconPlugin",
    "debug": false,
    "version": 330499
}


Got keys from plugin meta data ("svg", "svgz", "svg.gz")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/iconengines" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/arm-linux-gnueabihf/qt5/plugins/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/arm-linux-gnueabihf/qt5/plugins/accessiblebridge" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/accessiblebridge" ...

2 個解決方案

解決方案1
 1  2020-07-28 19:34:57

我今天一直在與類似的問題作斗爭（這就是我發現你的帖子的方式）。 要擺脫 libEGL 警告，請運行 raspi-config 並從 Advanced Options->GL Driver 中選擇“Full KMS”選項（然后重新啟動）。 不過，這可能無法解決您的樣式問題 - 我看到 Pi（我的目標系統）和我的 Linux Mint 開發系統之間的樣式差異。

解決方案2
 0  2021-01-10 03:30:19

我有一個類似的問題，按以下方式運行它會解決它。

sudo python3.7 name.py

我想 IDE 或當前登錄的用戶需要一些特權。 盡管顏色仍然比 Windows 和 Ubuntu 更不透明。

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