Method mouseMoveEvent

Telegram/SourceFiles/boxes/background_box.cpp:724–768

}

void BackgroundBox::Inner::mouseMoveEvent(QMouseEvent *e) {
	const auto newOver = [&] {
		const auto x = e->pos().x();
		const auto y = e->pos().y();
		const auto width = st::backgroundSize.width();
		const auto height = st::backgroundSize.height();
		const auto skip = st::backgroundPadding;
		const auto row = int((y - skip) / (height + skip));
		const auto column = int((x - skip) / (width + skip));
		const auto result = row * kBackgroundsInRow + column;
		if (y - row * (height + skip) > skip + height) {
			return Selection();
		} else if (x - column * (width + skip) > skip + width) {
			return Selection();
		} else if (result >= _papers.size()) {
			return Selection();
		}
		auto &data = _papers[result].data;
		const auto deleteLeft = (column + 1) * (width + skip)
			- st::stickerPanDeleteIconBg.width();
		const auto deleteBottom = row * (height + skip) + skip
			+ st::stickerPanDeleteIconBg.height();
		const auto inDelete = !forChannel()
			&& (x >= deleteLeft)
			&& (y < deleteBottom)
			&& Data::IsCloudWallPaper(data)
			&& !Data::IsDefaultWallPaper(data)
			&& !Data::IsLegacy2DefaultWallPaper(data)
			&& !Data::IsLegacy3DefaultWallPaper(data)
			&& (_currentId != data.id());
		return (result >= _papers.size())
			? Selection()
			: inDelete
			? Selection(DeleteSelected{ result })
			: Selection(Selected{ result });
	}();
	if (_over != newOver) {
		repaintPaper(getSelectionIndex(_over));
		_over = newOver;
		repaintPaper(getSelectionIndex(_over));
		setCursor((!v::is_null(_over) || !v::is_null(_overDown))
			? style::cur_pointer
			: style::cur_default);
	}
}

void BackgroundBox::Inner::repaintPaper(int index) {
	if (index < 0 || index >= _papers.size()) {