adaptive_horiz_header_view.h

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/*
 * This file depends on Qt which is licens ed under LGPLv3.
 * See ADTF_DIR/3rdparty/qt5 and doc/license for detailed information.
 */
 
#pragma once
#include <QHeaderView>
#include <QVariantMap>
#include <QTreeView>

class cAdaptiveHorizontalHeaderView final : public QHeaderView
{
    Q_OBJECT
public:
    enum class HeaderLayoutMode
    {
        Auto,
        Manual
    };

    explicit cAdaptiveHorizontalHeaderView(QAbstractItemView* pParent = nullptr);
    explicit cAdaptiveHorizontalHeaderView(const QList<QAction*>& oAdditionalActions,
                                           QAbstractItemView* pParent = nullptr);
    explicit cAdaptiveHorizontalHeaderView(const QList<QAction*>& oAdditionalActions,
                                           const QMap<int, int>& oDefaultSectionSizes,
                                           QAbstractItemView* pParent = nullptr);
    ~cAdaptiveHorizontalHeaderView() override = default;

    void SetLayoutMode(const HeaderLayoutMode eMode);

    HeaderLayoutMode GetLayoutMode() const;

    void InitHeader();

    static void ApplyViewState(const QVariantMap& oSettings, QTreeView* pView);

    static QVariantMap BuildViewState(QTreeView* pView);
 
private:
    void CreateAndAddManualResizeAction();
    bool IsManualLayoutMode() const
    {
        return m_eLayoutMode == HeaderLayoutMode::Manual;
    };
 
    HeaderLayoutMode m_eLayoutMode{HeaderLayoutMode::Auto};
    QAction* m_pManualCheckBox;
    QMap<int, int> m_oDefaultSectionSizes;
 
    class ViewStateContext
    {
    public:
        ViewStateContext(QTreeView* pView);
 
        void ApplySettings(const QVariantMap& oSettings);
        QVariantMap BuildSettings() const;
 
    private:
        QTreeView* m_pView;
        cAdaptiveHorizontalHeaderView* m_pHeader;
 
        void InitializeAndValidate();
        bool IsValid() const;
        void ApplyLayoutMode(const QVariantMap& oSettings);
        void ApplyColumnWidths(const QVariantMap& oSettings);
        void SaveLayoutMode(QVariantMap& oSettings) const;
        void SaveColumnWidths(QVariantMap& oSettings) const;
    };
};