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computed when the calculation is added to the store and don't change afterwards. Otherwise, if their heights change when scrolling (due to a modification of the display output type - ExactOnly, ApproximateOnly...), it generates crashes.
115 lines
3.7 KiB
C++
115 lines
3.7 KiB
C++
#ifndef CALCULATION_CALCULATION_H
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#define CALCULATION_CALCULATION_H
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#include <apps/constant.h>
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#include <escher.h>
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#include <poincare/context.h>
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#include <poincare/expression.h>
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#include "../shared/poincare_helpers.h"
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namespace Calculation {
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class CalculationStore;
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/* A calculation is:
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* | uint8_t |KDCoordinate| KDCoordinate | uint8_t | ... | ... | ... |
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* |m_displayOutput| m_height |m_expandedHeight|m_equalSign|m_inputText|m_exactOuputText|m_approximateOuputText|
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*
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* */
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class Calculation {
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friend CalculationStore;
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public:
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enum class EqualSign : uint8_t {
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Unknown,
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Approximation,
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Equal
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};
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enum class DisplayOutput : uint8_t {
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Unknown,
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ExactOnly,
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ApproximateOnly,
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ExactAndApproximate,
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ExactAndApproximateToggle
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};
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enum class AdditionalInformationType {
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None = 0,
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Integer,
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Rational,
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Trigonometry,
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Unit,
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Complex
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};
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static bool DisplaysExact(DisplayOutput d) { return d != DisplayOutput::ApproximateOnly; }
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/* It is not really the minimal size, but it clears enough space for most
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* calculations instead of clearing less space, then fail to serialize, clear
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* more space, fail to serialize, clear more space, etc., until reaching
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* sufficient free space. */
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static int MinimalSize() { return sizeof(uint8_t) + 2*sizeof(KDCoordinate) + sizeof(uint8_t) + 3*Constant::MaxSerializedExpressionSize; }
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Calculation() :
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m_displayOutput(DisplayOutput::Unknown),
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m_height(-1),
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m_expandedHeight(-1),
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m_equalSign(EqualSign::Unknown)
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{
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assert(sizeof(m_inputText) == 0);
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}
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bool operator==(const Calculation& c);
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Calculation * next() const;
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// Texts
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enum class NumberOfSignificantDigits {
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Maximal,
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UserDefined
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};
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const char * inputText() const { return m_inputText; }
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const char * exactOutputText() const { return m_inputText + strlen(m_inputText) + 1; }
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// See comment in approximateOutput implementation explaining the need of two approximateOutputTexts
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const char * approximateOutputText(NumberOfSignificantDigits numberOfSignificantDigits) const;
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// Expressions
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Poincare::Expression input();
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Poincare::Expression exactOutput();
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Poincare::Expression approximateOutput(Poincare::Context * context, NumberOfSignificantDigits numberOfSignificantDigits);
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// Layouts
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Poincare::Layout createInputLayout();
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Poincare::Layout createExactOutputLayout(bool * couldNotCreateExactLayout);
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Poincare::Layout createApproximateOutputLayout(Poincare::Context * context, bool * couldNotCreateApproximateLayout);
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// Heights
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KDCoordinate height(bool expanded);
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// Displayed output
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DisplayOutput displayOutput(Poincare::Context * context);
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void forceDisplayOutput(DisplayOutput d);
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bool shouldOnlyDisplayExactOutput();
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EqualSign exactAndApproximateDisplayedOutputsAreEqual(Poincare::Context * context);
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// Additional Information
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AdditionalInformationType additionalInformationType(Poincare::Context * context);
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private:
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static constexpr int k_numberOfExpressions = 4;
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static constexpr KDCoordinate k_heightComputationFailureHeight = 50;
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static constexpr const char * k_maximalIntegerWithAdditionalInformation = "10000000000000000";
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void setHeights(KDCoordinate height, KDCoordinate expandedHeight);
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/* Buffers holding text expressions have to be longer than the text written
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* by user (of maximum length TextField::maxBufferSize()) because when we
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* print an expression we add omitted signs (multiplications, parenthesis...) */
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DisplayOutput m_displayOutput;
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KDCoordinate m_height __attribute__((packed));
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KDCoordinate m_expandedHeight __attribute__((packed));
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EqualSign m_equalSign;
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char m_inputText[0]; // MUST be the last member variable
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};
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}
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#endif
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