Qt QMessageBox 显示无颜色按钮

Question

我创建了一个带有自定义按钮的 QMessageBox，它们显示为灰色，如下图所示：

运行 Linux 没问题！但是在 Raspberry 上它给我带来了麻烦。我写的代码片段如下：

#include "alertmessage.h"
#include <QDebug>
#include <QAbstractButton>
#include <QCoreApplication>
AlertMessage::AlertMessage(QMessageBox *parent): QMessageBox(parent)
{

    this->setFont(QFont("Roboto"));
    QFont font = this->font();
    font.setPointSize(26);
    this->setMaximumHeight(250);
    this->setModal(true);
    this->setMaximumWidth(this->minimumHeight());
    this->setWindowTitle(QString("Falha de conexão"));
    this->setChecker(new QCheckBox("Não mostrar essa menssagem novamente.", this));
    this->setText(QString("<p style='margin-bottom: 0cm; line-height: 100%; text-align: justify;'>"
"Houve uma falha de comunica&ccedil;&atilde;o com um ou mais sensores, isso poder&aacute; "
"afetar o desempenho do sistema.</p>"));
    this->setInformativeText(QString("<p style='margin-bottom: 0cm; line-height: 100%; text-align:justify;'><strong>Voc&ecirc;"
" quer continuar ou <span style='color: #ff0000;'>PARAR</span> a aplica&ccedil;&atilde;o?</strong></p>"));
    this->setStandardButtons(QMessageBox::No | QMessageBox::Yes);
    this->setButtonText(QMessageBox::No, QString("Parar").toUpper());
    this->setButtonText(QMessageBox::Yes, QString("Continuar"));
    QPalette okPalette = this->button(QMessageBox::Yes)->palette();
    QPalette noPalette = this->button(QMessageBox::No)->palette();
    okPalette.setColor(QPalette::Button, QColor(13, 71, 161));
    okPalette.setColor(QPalette::ButtonText, QColor(Qt::white));
    noPalette.setColor(QPalette::Button, QColor(127, 0, 0));
    noPalette.setColor(QPalette::ButtonText, QColor(Qt::white));
    this->button(QMessageBox::Yes)->setPalette(okPalette);
    this->button(QMessageBox::No)->setPalette(noPalette);
    this->setIcon(QMessageBox::Warning);
    this->setCheckBox(this->getChecker());
    this->connect(this->button(QMessageBox::Yes), SIGNAL(clicked()), this, SLOT(turnVisible()));
    this->connect(this->button(QMessageBox::No), SIGNAL(clicked()), this, SLOT(turnOFF()));


}

Answer 1

我在 Linux 和 windows 中尝试过，如果你使用 QPalette 它们都使用你的 OS 和系统样式，因为如果你想要拥有自己的风格，最好使用 StyleSheet .

我在您的代码中看到的另一件事是，如果您将代码放在构造函数中，则不需要使用 this。

我更改了一些代码，结果是这样的：

    setFont(QFont("Roboto"));
    setAutoFillBackground(true);
    QFont font = this->font();
    font.setPointSize(26);
    setMaximumHeight(250);
    setModal(true);
    setMaximumWidth(minimumHeight());
    setWindowTitle(QString("Falha de conexão"));
    setChecker(new QCheckBox("Não mostrar essa menssagem novamente.", this));
    setText(QString("<p style='margin-bottom: 0cm; line-height: 100%; text-align: justify;'>"
"Houve uma falha de comunica&ccedil;&atilde;o com um ou mais sensores, isso poder&aacute; "
"afetar o desempenho do sistema.</p>"));
    this->setInformativeText(QString("<p style='margin-bottom: 0cm; line-height: 100%; text-align:justify;'><strong>Voc&ecirc;"
" quer continuar ou <span style='color: #ff0000;'>PARAR</span> a aplica&ccedil;&atilde;o?</strong></p>"));
    setStandardButtons(QMessageBox::No | QMessageBox::Yes);
    setButtonText(QMessageBox::No, QString("Parar").toUpper());
    setButtonText(QMessageBox::Yes, QString("Continuar"));
    button(QMessageBox::Yes)->setStyleSheet(QString::fromUtf8("background-color: rgb(13, 71, 161);color:white;"));
    button(QMessageBox::No)->setStyleSheet(QString::fromUtf8("background-color: rgb(127, 0, 0);color:white;"));
    setIcon(QMessageBox::Warning);
    setCheckBox(getChecker());
    connect(this->button(QMessageBox::Yes), SIGNAL(clicked()), this, SLOT(turnVisible()));
    connect(this->button(QMessageBox::No), SIGNAL(clicked()), this, SLOT(turnOFF()));

Answer 2

我解决了，每个 OS 都有一些默认样式，Qt 会搜索它们以使其看起来更“原生”。考虑到这一点，我需要强制我的应用程序采用不同于覆盆子标准样式的样式。解决该问题的代码：

QApplication  app(argc, argv);
qDebug() << QStyleFactory::keys(); //See available styles
app.setStyle("Fusion");

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