Qt 小例子学习18 - 自定义 QTabWidget 选项卡_qt designer中qtabwiget新建选项

Qt 小例子学习18 - 自定义 QTabWidget 选项卡

#include <QApplication>
#include <QLabel>
#include <QStyleOptionTab>
#include <QStylePainter>
#include <QTabWidget>

class TabBar : public QTabBar
{
    QVector<int> mUnSaved;

public:
    void setUnsaved(int index)
    {
        if (index >= count() || index < 0)
            return;
        mUnSaved << index;
        update();
    }
    void setSaved(int index)
    {
        if (!mUnSaved.contains(index))
            return;
        mUnSaved.remove(mUnSaved.indexOf(index));
        update();
    }

protected:
    void paintEvent(QPaintEvent * /*event*/)
    {

        QStylePainter painter(this);
        QStyleOptionTab opt;

        for (int i = 0; i < count(); i++)
        {
            initStyleOption(&opt, i);
            painter.save();
            if (mUnSaved.contains(i))
            {
                painter.setFont(QFont("Times", 15, QFont::Bold));
            }
            painter.drawControl(QStyle::CE_TabBarTabShape, opt);
            painter.drawControl(QStyle::CE_TabBarTabLabel, opt);
            painter.restore();
        }
    }
};

class TabWidget : public QTabWidget
{
    TabBar *mTabBar;

public:
    TabWidget(QWidget *parent = 0) : QTabWidget(parent)
    {
        mTabBar = new TabBar;
        setTabBar(mTabBar);
        for (int i = 0; i < 5; i++)
        {
            QString text = QString("Tab %1").arg(i);
            addTab(new QLabel(text, this), text);
        }
        mTabBar->setUnsaved(1);
        mTabBar->setUnsaved(3);
        mTabBar->setUnsaved(4);
        mTabBar->setSaved(3);
        mTabBar->setSaved(10);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    a.setStyle("fusion");
    TabWidget w;
    w.show();
    return a.exec();
}

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