nerix
105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
#pragma once
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#include <QLayout>
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#include <QStyle>
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#include <vector>
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namespace chatterino {
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/// @brief A QLayout wrapping items
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///
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/// Similar to a box layout that wraps its items. It's not super optimized.
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/// Some computations in #doLayout() could be cached.
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///
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/// This is based on the Qt flow layout example:
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/// https://doc.qt.io/qt-6/qtwidgets-layouts-flowlayout-example.html
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class FlowLayout : public QLayout
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{
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public:
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struct Options {
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int margin = -1;
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int hSpacing = -1;
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int vSpacing = -1;
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};
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explicit FlowLayout(QWidget *parent, Options options = {-1, -1, -1});
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explicit FlowLayout(Options options = {-1, -1, -1});
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~FlowLayout() override;
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FlowLayout(const FlowLayout &) = delete;
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FlowLayout(FlowLayout &&) = delete;
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FlowLayout &operator=(const FlowLayout &) = delete;
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FlowLayout &operator=(FlowLayout &&) = delete;
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/// @brief Adds @a item to this layout
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///
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/// Ownership of @a item is transferred. This method isn't usually called
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/// in application code (use addWidget/addLayout).
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/// See QLayout::addItem for more information.
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void addItem(QLayoutItem *item) override;
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/// @brief Adds a linebreak to this layout
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///
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/// @param height Specifies the height of the linebreak
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void addLinebreak(int height = 0);
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/// @brief Spacing on the horizontal axis
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///
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/// -1 if the default spacing for an item will be used.
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[[nodiscard]] int horizontalSpacing() const;
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/// Setter for #horizontalSpacing(). -1 to use defaults.
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void setHorizontalSpacing(int value);
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/// @brief Spacing on the vertical axis
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///
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/// -1 if the default spacing for an item will be used.
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[[nodiscard]] int verticalSpacing() const;
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/// Setter for #verticalSpacing(). -1 to use defaults.
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void setVerticalSpacing(int value);
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/// From QLayout. This layout doesn't expand in any direction.
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Qt::Orientations expandingDirections() const override;
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bool hasHeightForWidth() const override;
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int heightForWidth(int width) const override;
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QSize minimumSize() const override;
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QSize sizeHint() const override;
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void setGeometry(const QRect &rect) override;
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int count() const override;
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QLayoutItem *itemAt(int index) const override;
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/// From QLayout. Ownership is transferred to the caller
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QLayoutItem *takeAt(int index) override;
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private:
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/// @brief Computes the layout
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///
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/// @param rect The area in which items can be layed out
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/// @param testOnly If set, items won't be moved, only the total height
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/// will be computed.
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/// @returns The total height including margins.
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int doLayout(const QRect &rect, bool testOnly) const;
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/// @brief Computes the default spacing based for items on the parent
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///
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/// @param pm Either PM_LayoutHorizontalSpacing or PM_LayoutVerticalSpacing
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/// for the respective direction.
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/// @returns The spacing in dp, -1 if there isn't any parent
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int defaultSpacing(QStyle::PixelMetric pm) const;
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/// Computes the spacing for @a item
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QSize getSpacing(QLayoutItem *item) const;
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std::vector<QLayoutItem *> itemList_;
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int hSpace_ = -1;
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int vSpace_ = -1;
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int lineSpacing_ = -1;
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};
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} // namespace chatterino
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