1, Foreword

For the current front-end developers, FlatUI is certainly not new. In recent years, flat design has become more and more popular. Probably because the resolution of PC and mobile devices is getting higher and higher, flat design looks more pleasant, while the texture color produced by gradient color is not so kind as flat design.

Flat UI is a flat front-end framework developed based on Bootstrap. It provides dynamic and fashionable color matching, simple and gorgeous functional components, and also provides a smoother js interactive animation, which can be called one of the excellent representatives of the flat front-end design framework.

Since I am an excellent representative of flat design framework, I need to apply it in my own project. I first used VB for development, then changed to C ා for development, and finally changed to Qt for development, because the company needs to learn new programming framework according to the needs, and the languages are interlinked. To draw inferences from one case, I used to use vista clock control and vista calendar control written by C #, slightly The change is transferred to the corresponding control written by Qt, which is very convenient. As long as you master the idea and master a language and framework, others will learn very quickly.

The mechanism of qss in Qt is very similar to that of css. The feeling is that it was born out of css. Using qss to realize Qt interface style is not a general convenience, but rather rather cool. After seeing such a beautiful flat design style as FlatUI, it is difficult to restrain itching, so I want to use qss to achieve similar style.

2, Code thinking

QString FlatUI::setPushButtonQss(QPushButton *btn, int radius, int padding,
                                    const QString &normalColor,
                                    const QString &normalTextColor,
                                    const QString &hoverColor,
                                    const QString &hoverTextColor,
                                    const QString &pressedColor,
                                    const QString &pressedTextColor)
{
    QStringList list;
    list.append(QString("QPushButton{border-style:none;padding:%1px;border-radius:%2px;color:%3;background:%4;}")
                .arg(padding).arg(radius).arg(normalTextColor).arg(normalColor));
    list.append(QString("QPushButton:hover{color:%1;background:%2;}")
                .arg(hoverTextColor).arg(hoverColor));
    list.append(QString("QPushButton:pressed{color:%1;background:%2;}")
                .arg(pressedTextColor).arg(pressedColor));

    QString qss = list.join("");
    btn->setStyleSheet(qss);
    return qss;
}

QString FlatUI::setLineEditQss(QLineEdit *txt, int radius, int borderWidth,
                                  const QString &normalColor,
                                  const QString &focusColor)
{
    QStringList list;
    list.append(QString("QLineEdit{border-style:none;padding:3px;border-radius:%1px;border:%2px solid %3;}")
                .arg(radius).arg(borderWidth).arg(normalColor));
    list.append(QString("QLineEdit:focus{border:%1px solid %2;}")
                .arg(borderWidth).arg(focusColor));

    QString qss = list.join("");
    txt->setStyleSheet(qss);
    return qss;
}

QString FlatUI::setProgressQss(QProgressBar *bar, int barHeight,
                                     int barRadius, int fontSize,
                                     const QString &normalColor,
                                     const QString &chunkColor)
{

    QStringList list;
    list.append(QString("QProgressBar{font:%1pt;background:%2;max-height:%3px;border-radius:%4px;text-align:center;border:1px solid %2;}")
                .arg(fontSize).arg(normalColor).arg(barHeight).arg(barRadius));
    list.append(QString("QProgressBar:chunk{border-radius:%2px;background-color:%1;}")
                .arg(chunkColor).arg(barRadius));

    QString qss = list.join("");
    bar->setStyleSheet(qss);
    return qss;
}

QString FlatUI::setSliderQss(QSlider *slider, int sliderHeight,
                                const QString &normalColor,
                                const QString &grooveColor,
                                const QString &handleBorderColor,
                                const QString &handleColor)
{
    int sliderRadius = sliderHeight / 2;
    int handleWidth = (sliderHeight * 3) / 2 + (sliderHeight / 5);
    int handleRadius = handleWidth / 2;
    int handleOffset = handleRadius / 2;

    QStringList list;
    list.append(QString("QSlider::horizontal{min-height:%1px;}").arg(sliderHeight * 2));
    list.append(QString("QSlider::groove:horizontal{background:%1;height:%2px;border-radius:%3px;}")
                .arg(normalColor).arg(sliderHeight).arg(sliderRadius));
    list.append(QString("QSlider::add-page:horizontal{background:%1;height:%2px;border-radius:%3px;}")
                .arg(normalColor).arg(sliderHeight).arg(sliderRadius));
    list.append(QString("QSlider::sub-page:horizontal{background:%1;height:%2px;border-radius:%3px;}")
                .arg(grooveColor).arg(sliderHeight).arg(sliderRadius));
    list.append(QString("QSlider::handle:horizontal{width:%3px;margin-top:-%4px;margin-bottom:-%4px;border-radius:%5px;"
                        "background:qradialgradient(spread:pad,cx:0.5,cy:0.5,radius:0.5,fx:0.5,fy:0.5,stop:0.6 %1,stop:0.8 %2);}")
                .arg(handleColor).arg(handleBorderColor).arg(handleWidth).arg(handleOffset).arg(handleRadius));

    //Offset one pixel
    handleWidth = handleWidth + 1;
    list.append(QString("QSlider::vertical{min-width:%1px;}").arg(sliderHeight * 2));
    list.append(QString("QSlider::groove:vertical{background:%1;width:%2px;border-radius:%3px;}")
                .arg(normalColor).arg(sliderHeight).arg(sliderRadius));
    list.append(QString("QSlider::add-page:vertical{background:%1;width:%2px;border-radius:%3px;}")
                .arg(grooveColor).arg(sliderHeight).arg(sliderRadius));
    list.append(QString("QSlider::sub-page:vertical{background:%1;width:%2px;border-radius:%3px;}")
                .arg(normalColor).arg(sliderHeight).arg(sliderRadius));
    list.append(QString("QSlider::handle:vertical{height:%3px;margin-left:-%4px;margin-right:-%4px;border-radius:%5px;"
                        "background:qradialgradient(spread:pad,cx:0.5,cy:0.5,radius:0.5,fx:0.5,fy:0.5,stop:0.6 %1,stop:0.8 %2);}")
                .arg(handleColor).arg(handleBorderColor).arg(handleWidth).arg(handleOffset).arg(handleRadius));

    QString qss = list.join("");
    slider->setStyleSheet(qss);
    return qss;
}

QString FlatUI::setRadioButtonQss(QRadioButton *rbtn, int indicatorRadius,
                                     const QString &normalColor,
                                     const QString &checkColor)
{
    int indicatorWidth = indicatorRadius * 2;

    QStringList list;
    list.append(QString("QRadioButton::indicator{border-radius:%1px;width:%2px;height:%2px;}")
                .arg(indicatorRadius).arg(indicatorWidth));
    list.append(QString("QRadioButton::indicator::unchecked{background:qradialgradient(spread:pad,cx:0.5,cy:0.5,radius:0.5,fx:0.5,fy:0.5,"
                        "stop:0.6 #FFFFFF,stop:0.7 %1);}").arg(normalColor));
    list.append(QString("QRadioButton::indicator::checked{background:qradialgradient(spread:pad,cx:0.5,cy:0.5,radius:0.5,fx:0.5,fy:0.5,"
                        "stop:0 %1,stop:0.3 %1,stop:0.4 #FFFFFF,stop:0.6 #FFFFFF,stop:0.7 %1);}").arg(checkColor));

    QString qss = list.join("");
    rbtn->setStyleSheet(qss);
    return qss;
}

QString FlatUI::setScrollBarQss(QWidget *scroll, int radius, int min, int max,
                                   const QString &bgColor,
                                   const QString &handleNormalColor,
                                   const QString &handleHoverColor,
                                   const QString &handlePressedColor)
{
    //Scroll bar distance from background
    int padding = 0;

    QStringList list;

    //handle: indicator, scroll bar pull part add page: scroll bar pull increase part sub page: scroll bar pull decrease part add line: increase button sub line: decrease button

    //Horizontal scroll bar section
    list.append(QString("QScrollBar:horizontal{background:%1;padding:%2px;border-radius:%3px;min-height:%4px;max-height:%4px;}")
                .arg(bgColor).arg(padding).arg(radius).arg(max));
    list.append(QString("QScrollBar::handle:horizontal{background:%1;min-width:%2px;border-radius:%3px;}")
                .arg(handleNormalColor).arg(min).arg(radius));
    list.append(QString("QScrollBar::handle:horizontal:hover{background:%1;}")
                .arg(handleHoverColor));
    list.append(QString("QScrollBar::handle:horizontal:pressed{background:%1;}")
                .arg(handlePressedColor));
    list.append(QString("QScrollBar::add-page:horizontal{background:none;}"));
    list.append(QString("QScrollBar::sub-page:horizontal{background:none;}"));
    list.append(QString("QScrollBar::add-line:horizontal{background:none;}"));
    list.append(QString("QScrollBar::sub-line:horizontal{background:none;}"));

    //Vertical scroll bar section
    list.append(QString("QScrollBar:vertical{background:%1;padding:%2px;border-radius:%3px;min-width:%4px;max-width:%4px;}")
                .arg(bgColor).arg(padding).arg(radius).arg(max));
    list.append(QString("QScrollBar::handle:vertical{background:%1;min-height:%2px;border-radius:%3px;}")
                .arg(handleNormalColor).arg(min).arg(radius));
    list.append(QString("QScrollBar::handle:vertical:hover{background:%1;}")
                .arg(handleHoverColor));
    list.append(QString("QScrollBar::handle:vertical:pressed{background:%1;}")
                .arg(handlePressedColor));
    list.append(QString("QScrollBar::add-page:vertical{background:none;}"));
    list.append(QString("QScrollBar::sub-page:vertical{background:none;}"));
    list.append(QString("QScrollBar::add-line:vertical{background:none;}"));
    list.append(QString("QScrollBar::sub-line:vertical{background:none;}"));

    QString qss = list.join("");
    scroll->setStyleSheet(qss);
    return qss;
}

3, Renderings

4, Open source Homepage

All of the above works are downloaded from the open source homepage, and the quantity and quality of works will be continuously updated. Welcome to pay attention.

1. Domestic site: https://gitee.com/feiyangqingyun/QWidgetDemo
2. International site: https://github.com/feiyangqingyun/QWidgetDemo
3. Personal homepage: https://blog.csdn.net/feiyangqingyun
4. Zhihu homepage: https://www.zhihu.com/people/feiyangqingyun/