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75 lines
No EOL
2.6 KiB
C++
75 lines
No EOL
2.6 KiB
C++
/**
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* @file flow_layout.h
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* @ingroup UI
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* @brief A QLayout subclass that arranges child widgets in wrapping rows (horizontal flow)
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* or wrapping columns (vertical flow).
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*/
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//! \todo Document this file.
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#ifndef FLOW_LAYOUT_H
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#define FLOW_LAYOUT_H
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#include <QLayout>
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#include <QList>
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#include <QLoggingCategory>
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#include <QStyle>
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#include <QWidget>
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inline Q_LOGGING_CATEGORY(FlowLayoutLog, "flow_layout", QtInfoMsg);
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class FlowLayout : public QLayout
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{
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public:
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explicit FlowLayout(QWidget *parent = nullptr);
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FlowLayout(QWidget *parent, Qt::Orientation flowDirection, int margin = 0, int hSpacing = 0, int vSpacing = 0);
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~FlowLayout() override;
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void insertWidgetAtIndex(QWidget *toInsert, int index);
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// QLayout interface
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void addItem(QLayoutItem *item) override;
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[[nodiscard]] int count() const override;
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[[nodiscard]] QLayoutItem *itemAt(int index) const override;
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QLayoutItem *takeAt(int index) override;
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void setGeometry(const QRect &rect) override;
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// Size negotiation
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[[nodiscard]] Qt::Orientations expandingDirections() const override;
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[[nodiscard]] bool hasHeightForWidth() const override;
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[[nodiscard]] int heightForWidth(int width) const override;
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[[nodiscard]] QSize sizeHint() const override;
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[[nodiscard]] QSize minimumSize() const override;
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// Spacing helpers
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void setHorizontalMargin(int margin)
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{
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horizontalMargin = margin;
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}
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[[nodiscard]] int horizontalSpacing() const;
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void setVerticalMargin(int margin)
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{
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verticalMargin = margin;
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}
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[[nodiscard]] int verticalSpacing() const;
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[[nodiscard]] int smartSpacing(QStyle::PixelMetric pm) const;
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// Layout passes (virtual so subclasses can override placement logic)
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virtual int layoutAllRows(int originX, int originY, int availableWidth);
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virtual void layoutSingleRow(const QVector<QLayoutItem *> &rowItems, int x, int y, int availableWidth);
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int layoutAllColumns(int originX, int originY, int availableHeight);
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void layoutSingleColumn(const QVector<QLayoutItem *> &colItems, int x, int y);
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protected:
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// Size-hint helpers split by direction
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[[nodiscard]] QSize calculateSizeHintHorizontal() const;
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[[nodiscard]] QSize calculateMinimumSizeHorizontal() const;
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[[nodiscard]] QSize calculateSizeHintVertical() const;
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[[nodiscard]] QSize calculateMinimumSizeVertical() const;
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QList<QLayoutItem *> items;
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Qt::Orientation flowDirection;
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int horizontalMargin; ///< Horizontal spacing between items (-1 = use style default)
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int verticalMargin; ///< Vertical spacing between items (-1 = use style default)
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};
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#endif // FLOW_LAYOUT_H
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