You can use my logic of making rounded corners QWidget:
#include "RoundedBox.h"
#include <QPainter>
#include <QPainterPath>
#include <QBitmap>
#include <QFontMetrics>
RoundedBox::RoundedBox(const QString &txt, QWidget *parent)
: QWidget(nullptr), isDarkMode(false), text(txt), useAsToolTip(false)
{
setWindowFlags(Qt::FramelessWindowHint | Qt::NoDropShadowWindowHint);
setAttribute(Qt::WA_TranslucentBackground);
setAsToolTip(false);
}
void RoundedBox::enableDarkMode(bool value)
{
isDarkMode = value;
}
void RoundedBox::setAsToolTip(bool value) {
useAsToolTip = value;
if (useAsToolTip) {
setWindowFlag(Qt::ToolTip);
updateSizeForText();
} else {
setWindowFlag(Qt::Popup);
}
update();
}
void RoundedBox::updateSizeForText() {
resize(sizeHint());
}
QSize RoundedBox::sizeHint() const {
QFont font;
font.setPointSize(9);
font.setFamily("Segoe UI");
QFontMetrics fm(font);
int MAX_W = 400;
QSize s = fm.boundingRect(0, 0, MAX_W, 0, Qt::TextWordWrap, text).size();
return QSize(s.width() + 24, s.height() + 12);
}
void RoundedBox::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event);
// Rounded mask
QBitmap bitmap(width(), height());
bitmap.fill(Qt::color0);
QPainter maskPainter(&bitmap);
maskPainter.setRenderHints(QPainter::Antialiasing);
QPainterPath maskPath;
maskPath.addRoundedRect(rect(), 6, 6);
maskPainter.fillPath(maskPath, Qt::color1);
setMask(bitmap);
// Colors
QColor BG = isDarkMode ? QColor("#2D2D2D") : QColor("#FFFFFF");
QColor BR = isDarkMode ? QColor("#4D4D4D") : QColor("#BDBDBD");
QPainter painter(this);
painter.setRenderHints(QPainter::Antialiasing);
painter.setBrush(BG);
QPen pen(BR);
pen.setWidth(1);
painter.setPen(pen);
QPainterPath path;
path.addRoundedRect(rect().adjusted(1.5, 1.5, -1.5, -1.5), 6, 6);
painter.drawPath(path);
// Text
if (useAsToolTip) {
QFont font;
font.setPointSize(9);
font.setFamily("Segoe UI");
painter.setFont(font);
painter.setPen(isDarkMode ? QColor("#F0F0F0") : QColor("#000000"));
QRect text_area(12, 0, width() - 24, height());
painter.drawText(text_area, Qt::AlignCenter | Qt::TextWordWrap, text);
}
}
