fraction_layout.h
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#ifndef POINCARE_FRACTION_LAYOUT_H
#define POINCARE_FRACTION_LAYOUT_H
#include <poincare/static_layout_hierarchy.h>
#include <poincare/layout_engine.h>
namespace Poincare {
class FractionLayout : public StaticLayoutHierarchy<2> {
public:
using StaticLayoutHierarchy::StaticLayoutHierarchy;
ExpressionLayout * clone() const override;
// Collapse
void collapseSiblingsAndMoveCursor(ExpressionLayoutCursor * cursor) override;
// User input
void deleteBeforeCursor(ExpressionLayoutCursor * cursor) override;
// Tree navigation
ExpressionLayoutCursor cursorLeftOf(ExpressionLayoutCursor cursor, bool * shouldRecomputeLayout) override;
ExpressionLayoutCursor cursorRightOf(ExpressionLayoutCursor cursor, bool * shouldRecomputeLayout) override;
ExpressionLayoutCursor cursorAbove(ExpressionLayoutCursor cursor, bool * shouldRecomputeLayout, bool equivalentPositionVisited = false) override;
ExpressionLayoutCursor cursorUnder(ExpressionLayoutCursor cursor, bool * shouldRecomputeLayout, bool equivalentPositionVisited = false) override;
// Serialization
int writeTextInBuffer(char * buffer, int bufferSize) const override;
// Other
ExpressionLayout * layoutToPointWhenInserting() override;
bool canBeOmittedMultiplicationRightFactor() const override { return false; }
/* WARNING: We need to override this function, else 1/2 3/4 would be
* serialized as 1/2**3/4, as the two Fraction layouts think their sibling is
* an omitted multiplication layout factor. We have the same problem with
* 2^3 1/2 being serialized as 2^3**1/2, so must override the Right version
* and not canBeOmittedMultiplicationLeftFactor. */
protected:
void render(KDContext * ctx, KDPoint p, KDColor expressionColor, KDColor backgroundColor) override;
KDSize computeSize() override;
void computeBaseline() override;
KDPoint positionOfChild(ExpressionLayout * child) override;
private:
constexpr static KDCoordinate k_fractionLineMargin = 2;
constexpr static KDCoordinate k_fractionLineHeight = 1;
ExpressionLayout * numeratorLayout() { return editableChild(0); }
ExpressionLayout * denominatorLayout() { return editableChild(1); }
};
}
#endif