230 lines
9.8 KiB
C
230 lines
9.8 KiB
C
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2020 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 6 End-User License
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Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
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End User License Agreement: www.juce.com/juce-6-licence
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Privacy Policy: www.juce.com/juce-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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/**
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Container that handles geometry for grid layouts (fixed columns and rows) using a set of declarative rules.
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Implemented from the `CSS Grid Layout` specification as described at:
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https://css-tricks.com/snippets/css/complete-guide-grid/
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@see GridItem
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@tags{GUI}
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*/
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class JUCE_API Grid final
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{
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public:
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//==============================================================================
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/** A size in pixels */
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struct Px final
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{
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explicit Px (float p) : pixels (static_cast<long double>(p)) { /*sta (p >= 0.0f);*/ }
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explicit Px (int p) : pixels (static_cast<long double>(p)) { /*sta (p >= 0.0f);*/ }
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explicit constexpr Px (long double p) : pixels (p) {}
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explicit constexpr Px (unsigned long long p) : pixels (static_cast<long double>(p)) {}
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long double pixels;
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};
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/** A fractional ratio integer */
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struct Fr final
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{
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explicit Fr (int f) : fraction (static_cast<unsigned long long> (f)) {}
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explicit constexpr Fr (unsigned long long p) : fraction (p) {}
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unsigned long long fraction;
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};
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//==============================================================================
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/** Represents a track. */
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struct TrackInfo final
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{
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/** Creates a track with auto dimension. */
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TrackInfo() noexcept;
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TrackInfo (Px sizeInPixels) noexcept;
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TrackInfo (Fr fractionOfFreeSpace) noexcept;
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TrackInfo (Px sizeInPixels, const String& endLineNameToUse) noexcept;
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TrackInfo (Fr fractionOfFreeSpace, const String& endLineNameToUse) noexcept;
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TrackInfo (const String& startLineNameToUse, Px sizeInPixels) noexcept;
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TrackInfo (const String& startLineNameToUse, Fr fractionOfFreeSpace) noexcept;
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TrackInfo (const String& startLineNameToUse, Px sizeInPixels, const String& endLineNameToUse) noexcept;
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TrackInfo (const String& startLineNameToUse, Fr fractionOfFreeSpace, const String& endLineNameToUse) noexcept;
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bool isAuto() const noexcept { return hasKeyword; }
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bool isFractional() const noexcept { return isFraction; }
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bool isPixels() const noexcept { return ! isFraction; }
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const String& getStartLineName() const noexcept { return startLineName; }
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const String& getEndLineName() const noexcept { return endLineName; }
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/** Get the track's size - which might mean an absolute pixels value or a fractional ratio. */
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float getSize() const noexcept { return size; }
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private:
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friend class Grid;
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float getAbsoluteSize (float relativeFractionalUnit) const;
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float size = 0; // Either a fraction or an absolute size in pixels
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bool isFraction = false;
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bool hasKeyword = false;
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String startLineName, endLineName;
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};
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//==============================================================================
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/** Possible values for the justifyItems property. */
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enum class JustifyItems : int
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{
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start = 0, /**< Content inside the item is justified towards the left. */
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end, /**< Content inside the item is justified towards the right. */
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center, /**< Content inside the item is justified towards the center. */
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stretch /**< Content inside the item is stretched from left to right. */
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};
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/** Possible values for the alignItems property. */
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enum class AlignItems : int
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{
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start = 0, /**< Content inside the item is aligned towards the top. */
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end, /**< Content inside the item is aligned towards the bottom. */
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center, /**< Content inside the item is aligned towards the center. */
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stretch /**< Content inside the item is stretched from top to bottom. */
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};
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/** Possible values for the justifyContent property. */
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enum class JustifyContent
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{
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start, /**< Items are justified towards the left of the container. */
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end, /**< Items are justified towards the right of the container. */
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center, /**< Items are justified towards the center of the container. */
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stretch, /**< Items are stretched from left to right of the container. */
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spaceAround, /**< Items are evenly spaced along the row with spaces between them. */
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spaceBetween, /**< Items are evenly spaced along the row with spaces around them. */
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spaceEvenly /**< Items are evenly spaced along the row with even amount of spaces between them. */
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};
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/** Possible values for the alignContent property. */
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enum class AlignContent
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{
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start, /**< Items are aligned towards the top of the container. */
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end, /**< Items are aligned towards the bottom of the container. */
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center, /**< Items are aligned towards the center of the container. */
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stretch, /**< Items are stretched from top to bottom of the container. */
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spaceAround, /**< Items are evenly spaced along the column with spaces between them. */
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spaceBetween, /**< Items are evenly spaced along the column with spaces around them. */
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spaceEvenly /**< Items are evenly spaced along the column with even amount of spaces between them. */
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};
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/** Possible values for the autoFlow property. */
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enum class AutoFlow
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{
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row, /**< Fills the grid by adding rows of items. */
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column, /**< Fills the grid by adding columns of items. */
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rowDense, /**< Fills the grid by adding rows of items and attempts to fill in gaps. */
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columnDense /**< Fills the grid by adding columns of items and attempts to fill in gaps. */
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};
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//==============================================================================
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/** Creates an empty Grid container with default parameters. */
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Grid() = default;
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/** Destructor */
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~Grid() noexcept = default;
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//==============================================================================
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/** Specifies the alignment of content inside the items along the rows. */
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JustifyItems justifyItems = JustifyItems::stretch;
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/** Specifies the alignment of content inside the items along the columns. */
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AlignItems alignItems = AlignItems::stretch;
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/** Specifies the alignment of items along the rows. */
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JustifyContent justifyContent = JustifyContent::stretch;
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/** Specifies the alignment of items along the columns. */
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AlignContent alignContent = AlignContent::stretch;
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/** Specifies how the auto-placement algorithm places items. */
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AutoFlow autoFlow = AutoFlow::row;
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//==============================================================================
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/** The set of column tracks to lay out. */
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Array<TrackInfo> templateColumns;
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/** The set of row tracks to lay out. */
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Array<TrackInfo> templateRows;
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/** Template areas */
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StringArray templateAreas;
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/** The row track for auto dimension. */
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TrackInfo autoRows;
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/** The column track for auto dimension. */
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TrackInfo autoColumns;
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/** The gap in pixels between columns. */
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Px columnGap { 0 };
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/** The gap in pixels between rows. */
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Px rowGap { 0 };
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/** Sets the gap between rows and columns in pixels. */
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void setGap (Px sizeInPixels) noexcept { rowGap = columnGap = sizeInPixels; }
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//==============================================================================
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/** The set of items to lay-out. */
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Array<GridItem> items;
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//==============================================================================
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/** Lays-out the grid's items within the given rectangle. */
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void performLayout (Rectangle<int>);
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//==============================================================================
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/** Returns the number of columns. */
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int getNumberOfColumns() const noexcept { return templateColumns.size(); }
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/** Returns the number of rows. */
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int getNumberOfRows() const noexcept { return templateRows.size(); }
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private:
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//==============================================================================
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struct SizeCalculation;
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struct PlacementHelpers;
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struct AutoPlacement;
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struct BoxAlignment;
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};
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constexpr Grid::Px operator"" _px (long double px) { return Grid::Px { px }; }
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constexpr Grid::Px operator"" _px (unsigned long long px) { return Grid::Px { px }; }
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constexpr Grid::Fr operator"" _fr (unsigned long long fr) { return Grid::Fr { fr }; }
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} // namespace juce
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