Matrix support

calculatorpp/src/main/java/org/solovyev/android/calculator/matrix/CalculatorMatrixEditFragment.java

@@ -3,12 +3,15 @@ package org.solovyev.android.calculator.matrix;
 import android.os.Bundle;
 import android.view.View;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.calculator.CalculatorFragment;
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.about.CalculatorFragmentType;
 import org.solovyev.android.view.IntegerRange;
 import org.solovyev.android.view.Picker;
 
+import java.io.Serializable;
+
 /**
  * User: Solovyev_S
  * Date: 12.10.12
@@ -29,6 +32,8 @@ public class CalculatorMatrixEditFragment extends CalculatorFragment implements
     private static final int DEFAULT_ROWS = 2;
     private static final int DEFAULT_COLS = 2;
 
+    private static final String MATRIX = "matrix";
+
 
     /*
     **********************************************************************
@@ -40,6 +45,8 @@ public class CalculatorMatrixEditFragment extends CalculatorFragment implements
 
     public CalculatorMatrixEditFragment() {
         super(CalculatorFragmentType.matrix_edit);
+
+        setRetainInstance(true);
     }
 
     /*
@@ -52,15 +59,37 @@ public class CalculatorMatrixEditFragment extends CalculatorFragment implements
 
 
     @Override
-    public void onViewCreated(View root, Bundle savedInstanceState) {
+    public void onViewCreated(View root, @Nullable Bundle in) {
-        super.onViewCreated(root, savedInstanceState);
+        super.onViewCreated(root, in);
 
         final Picker<Integer> matrixRowsCountPicker = (Picker<Integer>) root.findViewById(R.id.matrix_rows_count_picker);
         initPicker(matrixRowsCountPicker);
         final Picker<Integer> matrixColsCountPicker = (Picker<Integer>) root.findViewById(R.id.matrix_cols_count_picker);
         initPicker(matrixColsCountPicker);
 
-        getMatrixView(root).setMatrixDimensions(DEFAULT_ROWS, DEFAULT_COLS);
+        Matrix matrix = null;
+        if (in != null) {
+            final Object matrixObject = in.getSerializable(MATRIX);
+            if (matrixObject instanceof Matrix) {
+                matrix = (Matrix) matrixObject;
+            }
+        }
+
+        final MatrixView matrixView = getMatrixView(root);
+        if (matrix == null) {
+            matrixView.setMatrixDimensions(DEFAULT_ROWS, DEFAULT_COLS);
+        } else {
+            matrixView.setMatrix(matrix.bakingArray);
+        }
+        matrixRowsCountPicker.setCurrent(matrixView.getRows());
+        matrixColsCountPicker.setCurrent(matrixView.getCols());
+    }
+
+    @Override
+    public void onSaveInstanceState(@NotNull Bundle out) {
+        super.onSaveInstanceState(out);
+
+        out.putSerializable(MATRIX, new Matrix(getMatrixView(getView()).toMatrix()));
     }
 
     @NotNull
@@ -92,4 +121,17 @@ public class CalculatorMatrixEditFragment extends CalculatorFragment implements
     private void onRowsCountChange(@NotNull Integer newRows) {
         getMatrixView(getView()).setMatrixRows(newRows);
     }
+
+    public static class Matrix implements Serializable {
+
+        @NotNull
+        private String[][] bakingArray;
+
+        public Matrix() {
+        }
+
+        public Matrix(@NotNull String[][] bakingArray) {
+            this.bakingArray = bakingArray;
+        }
+    }
 }

calculatorpp/src/main/java/org/solovyev/android/calculator/matrix/MatrixView.java

@@ -70,6 +70,14 @@ public class MatrixView extends TableLayout {
     **********************************************************************
     */
 
+    public int getRows() {
+        return rows;
+    }
+
+    public int getCols() {
+        return cols;
+    }
+
     public void setMatrixCols(int newCols) {
         setMatrixDimensions(rows, newCols);
     }
@@ -124,11 +132,33 @@ public class MatrixView extends TableLayout {
                 setCell(row, col, matrix[row][col]);
             }
         }
+    }
 
+    @NotNull
+    public String[][] toMatrix() {
+        final String[][] result = new String[rows][cols];
+
+        for (int row = 0; row < rows; row++) {
+            for (int col = 0; col < cols; col++) {
+                final TextView cellTextView = (TextView) getCell(this, row, col);
+                if (cellTextView != null) {
+                    result[row][col] = cellTextView.getText().toString();
+                }
+            }
+        }
+
+        return result;
     }
 
     private void setCell(int row, int col, @Nullable Object o) {
-        getCell(this, row, col);
+        final TextView cellTextView = (TextView) getCell(this, row, col);
+        if (cellTextView != null) {
+            if (o == null) {
+                cellTextView.setText(null);
+            } else {
+                cellTextView.setText(String.valueOf(o));
+            }
+        }
     }
 
     /*