konsole/src/LabelsAligner.h

/*
    SPDX-FileCopyrightText: 2007-2008 Robert Knight <robertknight@gmail.com>
    SPDX-FileCopyrightText: 2018 Harald Sitter <sitter@kde.org>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

#ifndef LABELSALIGNER_H
#define LABELSALIGNER_H

#include <QObject>
#include <QVector>

class QWidget;
class QGridLayout;
template<typename T> class QVector;

namespace Konsole
{
    /**
     * An utility class for aligning 0th column in multiple QGridLayouts.
     *
     * Limitations:
     * - a layout can't be nested in another layout
     * - reference widget must be an ancestor of all added layouts
     * - only 0th column is processed (widgets spanning multiple columns
     *   are ignored)
     */
    class LabelsAligner: public QObject {
        Q_OBJECT

    public:
        explicit LabelsAligner(QWidget *refWidget);

        void addLayout(QGridLayout *layout);
        void addLayouts(const QVector<QGridLayout *> &layouts);
        void setReferenceWidget(QWidget *refWidget);

    public Q_SLOTS:
        void updateLayouts();
        void align();

    private:
        int getLeftMargin(const QGridLayout *layout);

        static constexpr int LABELS_COLUMN = 0;

        QWidget *_refWidget;
        QVector<QGridLayout *> _layouts;
    };

}

#endif