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73 lines
3.4 KiB
C++
73 lines
3.4 KiB
C++
#ifndef SHARED_EXPRESSION_MODEL_LIST_CONTROLLER_H
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#define SHARED_EXPRESSION_MODEL_LIST_CONTROLLER_H
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#include <escher.h>
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#include "expression_model_store.h"
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#include <apps/i18n.h>
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namespace Shared {
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class ExpressionModelListController : public ViewController, public SelectableTableViewDataSource, public SelectableTableViewDelegate {
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public:
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ExpressionModelListController(Responder * parentResponder, I18n::Message text);
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protected:
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static constexpr KDCoordinate k_expressionMargin = 5;
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// SelectableTableViewDelegate
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void tableViewDidChangeSelection(SelectableTableView * t, int previousSelectedCellX, int previousSelectedCellY, bool withinTemporarySelection) override;
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// TableViewDataSource
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virtual int numberOfExpressionRows() const;
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KDCoordinate memoizedRowHeight(int j);
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KDCoordinate memoizedCumulatedHeightFromIndex(int j);
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int memoizedIndexFromCumulatedHeight(KDCoordinate offsetY);
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virtual KDCoordinate expressionRowHeight(int j);
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virtual void willDisplayExpressionCellAtIndex(HighlightCell * cell, int j);
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// Responder
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bool handleEventOnExpression(Ion::Events::Event event);
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virtual void addEmptyModel();
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virtual void didChangeModelsList() { resetMemoization(); }
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virtual void reinitSelectedExpression(ExpiringPointer<ExpressionModelHandle> model);
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virtual void editExpression(Ion::Events::Event event);
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virtual bool editSelectedRecordWithText(const char * text);
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virtual bool removeModelRow(Ion::Storage::Record record);
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virtual int modelIndexForRow(int j) { return j; }
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virtual bool isAddEmptyRow(int j);
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// ViewController
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virtual SelectableTableView * selectableTableView() = 0;
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virtual ExpressionModelStore * modelStore() = 0;
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virtual InputViewController * inputController() = 0;
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// Memoization
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static constexpr int k_memoizedCellsCount = 7;
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/* We use memoization to speed up indexFromHeight(offset) in the children
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* classes: if offset is "around" the memoized cumulatedHeightForIndex, we can
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* compute its value easily by adding/substracting memoized row heights. We
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* thus need to memoize 3 cells (see under for explanation on the 3) above the
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* selected one, and 3 under, which gives 7 cells.
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* 3 is the maximal number of non selected visible rows if the selected cell
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* is completely [on top/at the bottom] of the screen. To compute this value:
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* (ScreenHeight - Metric::TitleBarHeight - Metric::TabHeight - ButtonRowHeight
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* - currentSelectedRowHeight) / Metric::StoreRowHeight
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* = (240-18-27-20-50)/50 = 2.5 */
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static_assert(ExpressionModelListController::k_memoizedCellsCount % 2 == 1, "ExpressionModelListController::k_memoizedCellsCount should be odd.");
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/* We memoize values for indexes around the selectedRow index.
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* k_memoizedCellsCount needs to be odd to compute things such as:
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* constexpr int halfMemoizationCount = k_memoizedCellsCount/2;
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* if (j < selectedRow - halfMemoizationCount
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* || j > selectedRow + halfMemoizationCount) { ... } */
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virtual void resetMemoizationForIndex(int index);
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virtual void shiftMemoization(bool newCellIsUnder);
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EvenOddMessageTextCell m_addNewModel;
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private:
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// Memoization
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static constexpr int k_resetedMemoizedValue = -1;
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void resetMemoization();
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// TableViewDataSource
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virtual KDCoordinate notMemoizedCumulatedHeightFromIndex(int j) = 0;
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virtual int notMemoizedIndexFromCumulatedHeight(KDCoordinate offsetY) = 0;
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KDCoordinate m_memoizedCellHeight[k_memoizedCellsCount];
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KDCoordinate m_cumulatedHeightForSelectedIndex;
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};
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}
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#endif
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