Refactor button handling in dialog fragments

app/src/main/java/org/solovyev/android/calculator/BaseDialogFragment.java

@@ -1,5 +1,7 @@
 package org.solovyev.android.calculator;
 
+import static org.solovyev.android.calculator.App.cast;
+
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.SharedPreferences;
@@ -14,15 +16,20 @@ import android.support.v7.app.AlertDialog;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.inputmethod.InputMethodManager;
+import android.widget.Button;
 
 import javax.inject.Inject;
 
-import static org.solovyev.android.calculator.App.cast;
+public abstract class BaseDialogFragment extends DialogFragment implements View.OnClickListener, DialogInterface.OnClickListener {
-
-public abstract class BaseDialogFragment extends DialogFragment {
 
     @Inject
     protected SharedPreferences preferences;
+    @Nullable
+    private Button positiveButton;
+    @Nullable
+    private Button negativeButton;
+    @Nullable
+    private Button neutralButton;
 
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
@@ -51,6 +58,9 @@ public abstract class BaseDialogFragment extends DialogFragment {
         dialog.setOnShowListener(new DialogInterface.OnShowListener() {
             @Override
             public void onShow(DialogInterface d) {
+                positiveButton = getButton(dialog, AlertDialog.BUTTON_POSITIVE);
+                negativeButton = getButton(dialog, AlertDialog.BUTTON_NEGATIVE);
+                neutralButton = getButton(dialog, AlertDialog.BUTTON_NEUTRAL);
                 onShowDialog(dialog, savedInstanceState == null);
             }
         });
@@ -60,6 +70,15 @@ public abstract class BaseDialogFragment extends DialogFragment {
     protected void onShowDialog(@NonNull AlertDialog dialog, boolean firstTime) {
     }
 
+    @Nullable
+    private Button getButton(@NonNull AlertDialog dialog, int buttonId) {
+        final Button button = dialog.getButton(buttonId);
+        if (button != null) {
+            button.setOnClickListener(this);
+        }
+        return button;
+    }
+
     protected abstract void onPrepareDialog(@NonNull AlertDialog.Builder builder);
 
     @Nullable
@@ -86,4 +105,25 @@ public abstract class BaseDialogFragment extends DialogFragment {
         final InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
         imm.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT);
     }
+
+    @Override
+    public void onClick(View v) {
+        if (v == positiveButton) {
+            onClick(getDialog(), DialogInterface.BUTTON_POSITIVE);
+        } else if (v == negativeButton) {
+            onClick(getDialog(), DialogInterface.BUTTON_NEGATIVE);
+        } else if (v == neutralButton) {
+            onClick(getDialog(), DialogInterface.BUTTON_NEUTRAL);
+        }
+    }
+
+    @Override
+    public void onClick(DialogInterface dialog, int which) {
+        switch (which) {
+            case DialogInterface.BUTTON_POSITIVE:
+            case DialogInterface.BUTTON_NEGATIVE:
+                dismiss();
+                break;
+        }
+    }
 }

app/src/main/java/org/solovyev/android/calculator/converter/ConverterFragment.java

@@ -16,10 +16,33 @@ import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.inputmethod.EditorInfo;
-import android.widget.*;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.EditText;
+import android.widget.ImageButton;
+import android.widget.Spinner;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import org.solovyev.android.calculator.App;
+import org.solovyev.android.calculator.AppComponent;
+import org.solovyev.android.calculator.BaseDialogFragment;
+import org.solovyev.android.calculator.Clipboard;
+import org.solovyev.android.calculator.Editor;
+import org.solovyev.android.calculator.R;
+
 import butterknife.Bind;
 import butterknife.ButterKnife;
-import org.solovyev.android.calculator.*;
+
+import java.text.DecimalFormat;
+import java.text.ParseException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
 
 import javax.annotation.Nonnull;
 import javax.inject.Inject;
@@ -27,12 +50,9 @@ import javax.measure.unit.Dimension;
 import javax.measure.unit.NonSI;
 import javax.measure.unit.SI;
 import javax.measure.unit.Unit;
-import java.text.DecimalFormat;
-import java.text.ParseException;
-import java.util.*;
 
 public class ConverterFragment extends BaseDialogFragment
-        implements AdapterView.OnItemSelectedListener, View.OnFocusChangeListener, TextView.OnEditorActionListener, View.OnClickListener, TextWatcher, DialogInterface.OnClickListener {
+        implements AdapterView.OnItemSelectedListener, View.OnFocusChangeListener, TextView.OnEditorActionListener, View.OnClickListener, TextWatcher {
 
     @Nonnull
     private static final DecimalFormat formatter = new DecimalFormat("0.#####E0");
@@ -121,9 +141,9 @@ public class ConverterFragment extends BaseDialogFragment
 
     @Override
     protected void onPrepareDialog(@NonNull AlertDialog.Builder builder) {
-        builder.setPositiveButton(R.string.c_use, this);
+        builder.setPositiveButton(R.string.c_use, null);
         builder.setNegativeButton(R.string.c_cancel, null);
-        builder.setNeutralButton(R.string.c_copy, this);
+        builder.setNeutralButton(R.string.c_copy, null);
     }
 
     @Override
@@ -312,8 +332,35 @@ public class ConverterFragment extends BaseDialogFragment
         switch (v.getId()) {
             case R.id.converter_swap_button:
                 swap();
+                break;
+            default:
+                super.onClick(v);
+                break;
+        }
+    }
+
+    @Override
+    public void onClick(DialogInterface dialog, int which) {
+        if (which == DialogInterface.BUTTON_NEGATIVE) {
+            dismiss();
             return;
         }
+        final String text = editTextTo.getText().toString();
+        try {
+            final double value = formatter.parse(text).doubleValue();
+            switch (which) {
+                case DialogInterface.BUTTON_POSITIVE:
+                    editor.insert(String.valueOf(value));
+                    dismiss();
+                    break;
+                case DialogInterface.BUTTON_NEUTRAL:
+                    clipboard.setText(String.valueOf(value));
+                    Toast.makeText(getActivity(), getString(R.string.c_result_copied),
+                            Toast.LENGTH_SHORT).show();
+                    break;
+            }
+        } catch (ParseException e) {
+        }
     }
 
     private void swap() {
@@ -356,23 +403,6 @@ public class ConverterFragment extends BaseDialogFragment
         convert(false);
     }
 
-    @Override
-    public void onClick(DialogInterface dialog, int which) {
-        final String text = editTextTo.getText().toString();
-        try {
-            final double value = formatter.parse(text).doubleValue();
-            switch (which) {
-                case DialogInterface.BUTTON_POSITIVE:
-                    editor.insert(String.valueOf(value));
-                    break;
-                case DialogInterface.BUTTON_NEUTRAL:
-                    clipboard.setText(String.valueOf(value));
-                    break;
-            }
-        } catch (ParseException e) {
-        }
-    }
-
     private enum MyDimension {
         TIME(Dimension.TIME, "Time"),
         AMOUNT_OF_SUBSTANCE(Dimension.AMOUNT_OF_SUBSTANCE, "Amount of substance"),

app/src/main/java/org/solovyev/android/calculator/functions/EditFunctionFragment.java

@@ -22,6 +22,8 @@
 
 package org.solovyev.android.calculator.functions;
 
+import static org.solovyev.android.calculator.functions.CppFunction.NO_ID;
+
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -35,27 +37,46 @@ import android.support.v4.app.FragmentManager;
 import android.support.v7.app.AlertDialog;
 import android.text.Editable;
 import android.text.TextUtils;
-import android.view.*;
+import android.view.ContextMenu;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.ViewParent;
 import android.view.inputmethod.InputMethodManager;
-import android.widget.Button;
 import android.widget.EditText;
-import butterknife.Bind;
+
-import butterknife.ButterKnife;
-import jscl.math.function.Function;
 import org.solovyev.android.Activities;
 import org.solovyev.android.Check;
-import org.solovyev.android.calculator.*;
+import org.solovyev.android.calculator.App;
+import org.solovyev.android.calculator.AppComponent;
+import org.solovyev.android.calculator.BaseDialogFragment;
+import org.solovyev.android.calculator.Calculator;
+import org.solovyev.android.calculator.Engine;
+import org.solovyev.android.calculator.FloatingCalculatorKeyboard;
+import org.solovyev.android.calculator.ParseException;
+import org.solovyev.android.calculator.R;
+import org.solovyev.android.calculator.VariablesRegistry;
 import org.solovyev.android.calculator.entities.EntityRemovalDialog;
 import org.solovyev.android.calculator.keyboard.FloatingKeyboardWindow;
 import org.solovyev.android.calculator.view.EditTextCompat;
 import org.solovyev.common.math.MathRegistry;
 
+import butterknife.Bind;
+import butterknife.ButterKnife;
+import jscl.math.function.Function;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
-import java.util.*;
-
-import static org.solovyev.android.calculator.functions.CppFunction.NO_ID;
 
 public class EditFunctionFragment extends BaseDialogFragment implements View.OnClickListener, View.OnFocusChangeListener, View.OnKeyListener {
 
@@ -111,7 +132,8 @@ public class EditFunctionFragment extends BaseDialogFragment implements View.OnC
             intent.putExtra(FunctionsActivity.EXTRA_FUNCTION, function);
             context.startActivity(intent);
         } else {
-            EditFunctionFragment.show(function, ((FunctionsActivity) context).getSupportFragmentManager());
+            EditFunctionFragment.show(function,
+                    ((FunctionsActivity) context).getSupportFragmentManager());
         }
     }
 
@@ -138,7 +160,8 @@ public class EditFunctionFragment extends BaseDialogFragment implements View.OnC
     protected void onPrepareDialog(@NonNull AlertDialog.Builder builder) {
         builder.setNegativeButton(R.string.c_cancel, null);
         builder.setPositiveButton(R.string.ok, null);
-        builder.setTitle(isNewFunction() ? R.string.function_create_function : R.string.function_edit_function);
+        builder.setTitle(isNewFunction() ? R.string.function_create_function :
+                R.string.function_edit_function);
         if (!isNewFunction()) {
             builder.setNeutralButton(R.string.c_remove, null);
         }
@@ -158,34 +181,15 @@ public class EditFunctionFragment extends BaseDialogFragment implements View.OnC
 
     @Override
     protected void onShowDialog(@NonNull AlertDialog dialog, boolean firstTime) {
-        super.onShowDialog(dialog, firstTime);
-
         if (firstTime) {
             nameView.selectAll();
             showIme(nameView);
         }
-
-        final Button ok = dialog.getButton(AlertDialog.BUTTON_POSITIVE);
-        ok.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                tryClose();
-            }
-        });
-        if (!isNewFunction()) {
-            Check.isNotNull(function);
-            final Button neutral = dialog.getButton(AlertDialog.BUTTON_NEUTRAL);
-            neutral.setOnClickListener(new View.OnClickListener() {
-                @Override
-                public void onClick(View v) {
-                    showRemovalDialog(function);
-                }
-            });
-        }
     }
 
     private void showRemovalDialog(@NonNull final CppFunction function) {
-        EntityRemovalDialog.showForFunction(getActivity(), function.name, new DialogInterface.OnClickListener() {
+        EntityRemovalDialog.showForFunction(getActivity(), function.name,
+                new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialog, int which) {
                         Check.isTrue(which == DialogInterface.BUTTON_POSITIVE);
@@ -231,7 +235,8 @@ public class EditFunctionFragment extends BaseDialogFragment implements View.OnC
     }
 
     private void showKeyboard() {
-        keyboardWindow.show(new FloatingCalculatorKeyboard(keyboardUser, collectParameters()), getDialog());
+        keyboardWindow.show(new FloatingCalculatorKeyboard(keyboardUser, collectParameters()),
+                getDialog());
     }
 
     @Nonnull
@@ -247,8 +252,29 @@ public class EditFunctionFragment extends BaseDialogFragment implements View.OnC
 
     @Override
     public void onClick(View v) {
-        if (v.getId() == R.id.function_body) {
+        switch (v.getId()) {
+            case R.id.function_body:
                 showKeyboard();
+                break;
+            default:
+                super.onClick(v);
+                break;
+        }
+    }
+
+    @Override
+    public void onClick(DialogInterface dialog, int which) {
+        switch (which) {
+            case DialogInterface.BUTTON_POSITIVE:
+                tryClose();
+                break;
+            case DialogInterface.BUTTON_NEUTRAL:
+                Check.isNotNull(function);
+                showRemovalDialog(function);
+                break;
+            default:
+                super.onClick(dialog, which);
+                break;
         }
     }
 

app/src/main/java/org/solovyev/android/calculator/variables/EditVariableFragment.java

@@ -22,6 +22,8 @@
 
 package org.solovyev.android.calculator.variables;
 
+import static org.solovyev.android.calculator.variables.CppVariable.NO_ID;
+
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -41,12 +43,16 @@ import android.view.inputmethod.InputMethodManager;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.PopupWindow;
-import butterknife.Bind;
+
-import butterknife.ButterKnife;
-import jscl.math.function.IConstant;
 import org.solovyev.android.Activities;
 import org.solovyev.android.Check;
-import org.solovyev.android.calculator.*;
+import org.solovyev.android.calculator.App;
+import org.solovyev.android.calculator.AppComponent;
+import org.solovyev.android.calculator.BaseDialogFragment;
+import org.solovyev.android.calculator.Calculator;
+import org.solovyev.android.calculator.Engine;
+import org.solovyev.android.calculator.R;
+import org.solovyev.android.calculator.VariablesRegistry;
 import org.solovyev.android.calculator.entities.EntityRemovalDialog;
 import org.solovyev.android.calculator.functions.FunctionsRegistry;
 import org.solovyev.android.calculator.keyboard.FloatingKeyboard;
@@ -55,13 +61,16 @@ import org.solovyev.android.calculator.math.MathType;
 import org.solovyev.android.calculator.view.EditTextCompat;
 import org.solovyev.common.text.Strings;
 
-import javax.annotation.Nonnull;
+import butterknife.Bind;
-import javax.annotation.Nullable;
+import butterknife.ButterKnife;
-import javax.inject.Inject;
+import jscl.math.function.IConstant;
+
 import java.util.Arrays;
 import java.util.List;
 
-import static org.solovyev.android.calculator.variables.CppVariable.NO_ID;
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import javax.inject.Inject;
 
 public class EditVariableFragment extends BaseDialogFragment implements View.OnFocusChangeListener, View.OnKeyListener, View.OnClickListener {
 
@@ -122,7 +131,8 @@ public class EditVariableFragment extends BaseDialogFragment implements View.OnF
             intent.putExtra(VariablesActivity.EXTRA_VARIABLE, variable);
             context.startActivity(intent);
         } else {
-            EditVariableFragment.showDialog(variable, ((VariablesActivity) context).getSupportFragmentManager());
+            EditVariableFragment.showDialog(variable,
+                    ((VariablesActivity) context).getSupportFragmentManager());
         }
     }
 
@@ -170,34 +180,15 @@ public class EditVariableFragment extends BaseDialogFragment implements View.OnF
 
     @Override
     protected void onShowDialog(@NonNull AlertDialog dialog, boolean firstTime) {
-        super.onShowDialog(dialog, firstTime);
-
         if (firstTime) {
             nameView.selectAll();
             showIme(nameView);
         }
-
-        final Button ok = dialog.getButton(AlertDialog.BUTTON_POSITIVE);
-        ok.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                tryClose();
-            }
-        });
-        if (!isNewVariable()) {
-            Check.isNotNull(variable);
-            final Button neutral = dialog.getButton(AlertDialog.BUTTON_NEUTRAL);
-            neutral.setOnClickListener(new View.OnClickListener() {
-                @Override
-                public void onClick(View v) {
-                    showRemovalDialog(variable);
-                }
-            });
-        }
     }
 
     private void showRemovalDialog(@NonNull final CppVariable variable) {
-        EntityRemovalDialog.showForVariable(getActivity(), variable.name, new DialogInterface.OnClickListener() {
+        EntityRemovalDialog.showForVariable(getActivity(), variable.name,
+                new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialog, int which) {
                         Check.isTrue(which == DialogInterface.BUTTON_POSITIVE);
@@ -352,6 +343,25 @@ public class EditVariableFragment extends BaseDialogFragment implements View.OnF
                     showKeyboard();
                 }
                 break;
+            default:
+                super.onClick(v);
+                break;
+        }
+    }
+
+    @Override
+    public void onClick(DialogInterface dialog, int which) {
+        switch (which) {
+            case DialogInterface.BUTTON_POSITIVE:
+                tryClose();
+                break;
+            case DialogInterface.BUTTON_NEUTRAL:
+                Check.isNotNull(variable);
+                showRemovalDialog(variable);
+                break;
+            default:
+                super.onClick(dialog, which);
+                break;
         }
     }