[apps] Shared: Move part of the implementation of TermSumController to

shared (Integral Graph Controller) and improve bound edition in
TermSumController.

apps/shared/sum_graph_controller.h

@@ -0,0 +1,89 @@
+#ifndef SHARED_SUM_GRAPH_CONTROLLER_H
+#define SHARED_SUM_GRAPH_CONTROLLER_H
+
+#include <escher.h>
+#include "function_graph_view.h"
+#include "interactive_curve_view_range.h"
+#include "vertical_cursor_view.h"
+#include "curve_view_cursor.h"
+#include "simple_interactive_curve_view_controller.h"
+#include "function.h"
+#include "text_field_delegate.h"
+
+namespace Shared {
+
+class SumGraphController : public SimpleInteractiveCurveViewController, public TextFieldDelegate {
+public:
+  SumGraphController(Responder * parentResponder, FunctionGraphView * curveView, InteractiveCurveViewRange * range, CurveViewCursor * cursor, char sumSymbol);
+  void viewWillAppear() override;
+  void didEnterResponderChain(Responder * previousFirstResponder) override;
+  bool handleEvent(Ion::Events::Event event) override;
+  void setFunction(Function * function);
+  bool textFieldDidFinishEditing(TextField * textField, const char * text, Ion::Events::Event event) override;
+  bool textFieldDidAbortEditing(TextField * textField, const char * text) override;
+  bool textFieldDidReceiveEvent(TextField * textField, Ion::Events::Event event) override;
+protected:
+  virtual bool moveCursorHorizontallyToPosition(double position);
+  enum class Step {
+    FirstParameter = 0,
+    SecondParameter = 1,
+    Result = 2
+  };
+  Step m_step;
+  double m_startSum;
+  double m_endSum;
+  Function * m_function;
+private:
+  constexpr static float k_cursorTopMarginRatio = 0.07f;   // (cursorHeight/2)/graphViewHeight
+  constexpr static float k_cursorRightMarginRatio = 0.04f; // (cursorWidth/2)/graphViewWidth
+  constexpr static float k_cursorBottomMarginRatio = 0.28f; // (cursorHeight/2+bannerHeigh)/graphViewHeight
+  constexpr static float k_cursorLeftMarginRatio = 0.04f;  // (cursorWidth/2)/graphViewWidth
+  virtual double computeSum(double start, double end) = 0;
+  virtual I18n::Message legendMessageAtStep(Step step) = 0;
+  virtual double cursorNextStep(double position, int direction) = 0;
+  Shared::InteractiveCurveViewRange * interactiveCurveViewRange() override { return m_graphRange; }
+  Shared::CurveView * curveView() override { return m_graphView; }
+  TextFieldDelegateApp * textFieldDelegateApp() override {
+    return static_cast<TextFieldDelegateApp *>(app());
+  }
+  bool handleEnter();
+  class LegendView : public View {
+  public:
+    LegendView(SumGraphController * controller, char sumSymbol);
+    ~LegendView();
+    LegendView(const LegendView& other) = delete;
+    LegendView(LegendView&& other) = delete;
+    LegendView& operator=(const LegendView& other) = delete;
+    LegendView& operator=(LegendView&& other) = delete;
+    TextField * textField() { return &m_editableZone; }
+    KDSize minimalSizeForOptimalDisplay() const override;
+    void drawRect(KDContext * ctx, KDRect rect) const override;
+    void setLegendMessage(I18n::Message message, Step step);
+    void setEditableZone(double d);
+    void setSumSymbol(Step step, double start = NAN, double end = NAN, double result = NAN, const char * sequenceName = nullptr);
+  private:
+    constexpr static KDCoordinate k_legendHeight = 35;
+    constexpr static KDCoordinate k_editableZoneWidth = 4*KDText::charSize(KDText::FontSize::Small).width();
+    constexpr static KDCoordinate k_editableZoneHeight = KDText::charSize(KDText::FontSize::Small).height();
+    constexpr static KDCoordinate k_symbolHeightMargin = 8;
+    constexpr static KDCoordinate k_sigmaHeight = 18;
+    int numberOfSubviews() const override;
+    View * subviewAtIndex(int index) override;
+    void layoutSubviews() override;
+    void layoutSubviews(Step step);
+    ExpressionView m_sum;
+    Poincare::ExpressionLayout * m_sumLayout;
+    MessageTextView m_legend;
+    TextField m_editableZone;
+    char m_draftText[TextField::maxBufferSize()];
+    char m_sumSymbol;
+  };
+  FunctionGraphView * m_graphView;
+  LegendView m_legendView;
+  InteractiveCurveViewRange * m_graphRange;
+  VerticalCursorView m_cursorView;
+};
+
+}
+
+#endif