#include "emojitabbar.h"
#include <QPainter>
#include <QStyleOptionTab>

EmojiTabBar::EmojiTabBar(QWidget *parent)
    : QTabBar(parent)
{
    setDrawBase(false);
    setExpanding(false);
    setUsesScrollButtons(false);
}

void EmojiTabBar::paintEvent(QPaintEvent *event) {
    Q_UNUSED(event);
    QPainter p(this);
    p.setRenderHint(QPainter::Antialiasing);

    int w = width();
    int h = height();
    static const QColor bgColor(255, 255, 255);
    static const QColor activeTextColor(0x33, 0x90, 0xEC);
    static const QColor inactiveTextColor(0x8E, 0x8E, 0x93);
    static const QColor activeBarColor(0x33, 0x90, 0xEC);
    static const QColor separatorColor(0xE0, 0xE0, 0xE0);

    p.fillRect(rect(), bgColor);

    QFont f = font();
    f.setPointSize(f.pointSize() - 1);
    p.setFont(f);

    int current = currentIndex();

    for (int i = 0; i < count(); ++i) {
        QRect r = tabRect(i);
        if (!r.isValid()) continue;

        bool active = (i == current);
        p.setPen(active ? activeTextColor : inactiveTextColor);
        p.drawText(r, Qt::AlignHCenter | Qt::AlignVCenter, tabText(i));

        if (active) {
            int barX = r.left() + 4;
            int barW = r.width() - 8;
            p.fillRect(QRect(barX, h - 3, barW, 3), activeBarColor);
        }
    }

    p.fillRect(QRect(0, h - 1, w, 1), separatorColor);
}