text + some fixes

res/values-es/text_strings.xml

@@ -134,7 +134,7 @@
 	<string name="c_expression_copied">Expression copied to the clipboard!</string>
 	<string name="c_history_item_status">Status: </string>
 	<string name="c_history_item_comment">Comment: </string>
-	<string name="c_use_expression">Use</string>
+	<string name="c_use">Use</string>
 	<string name="c_copy_expression">Copy expression</string>
 	<string name="c_copy_result">Copy result</string>
 	<string name="c_history_expression">Value</string>

res/values-it/text_strings.xml

@@ -134,7 +134,7 @@
 	<string name="c_expression_copied">Espressione copiato negli appunti!</string>
 	<string name="c_history_item_status">Stato: </string>
 	<string name="c_history_item_comment">Commento: </string>
-	<string name="c_use_expression">Uso</string>
+	<string name="c_use">Uso</string>
 	<string name="c_copy_expression">Copia espressione</string>
 	<string name="c_copy_result">Copia risultato</string>
 	<string name="c_history_expression">Valore</string>

res/values-ru/text_strings.xml

@@ -134,7 +134,7 @@
 	<string name="c_expression_copied">Выражение скопировано в буфер!</string>
 	<string name="c_history_item_status">Статус: </string>
 	<string name="c_history_item_comment">Комментарий: </string>
-	<string name="c_use_expression">Использовать</string>
+	<string name="c_use">Использовать</string>
 	<string name="c_copy_expression">Копировать выражение</string>
 	<string name="c_copy_result">Копировать результат</string>
 	<string name="c_history_expression">Значение</string>

res/values/text_strings.xml

@@ -134,7 +134,7 @@
 	<string name="c_expression_copied">Expression copied to the clipboard!</string>
 	<string name="c_history_item_status">Status: </string>
 	<string name="c_history_item_comment">Comment: </string>
-	<string name="c_use_expression">Use</string>
+	<string name="c_use">Use</string>
 	<string name="c_copy_expression">Copy expression</string>
 	<string name="c_copy_result">Copy result</string>
 	<string name="c_history_expression">Value</string>
@@ -150,4 +150,7 @@
 	<string name="c_history_was_removed">History was successfully removed!</string>
 	<string name="c_history_saved">History was successfully saved!</string>
 
+	<string name="c_copy_description">Copy description</string>
+	<string name="c_copy_value">Copy value</string>
+
 </resources>

src/main/java/org/solovyev/android/calculator/help/HelpActivity.java

@@ -14,6 +14,7 @@ import android.widget.TabHost;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.calculator.R;
+import org.solovyev.android.view.prefs.AndroidUtils;
 
 /**
  * User: serso
@@ -35,6 +36,8 @@ public class HelpActivity extends TabActivity {
 		createTab(tabHost, "screens", R.string.c_screens, HelpScreensActivity.class);
 
 		tabHost.setCurrentTab(0);
+
+		AndroidUtils.centerAndWrapTabsFor(tabHost);
 	}
 
 	private void createTab(@NotNull TabHost tabHost,

src/main/java/org/solovyev/android/calculator/history/HistoryItemMenuItem.java

@@ -20,7 +20,6 @@ import android.widget.Toast;
 import org.jetbrains.annotations.NotNull;
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.view.AMenuItem;
-import org.solovyev.android.view.prefs.ResourceCache;
 import org.solovyev.common.utils.StringUtils;
 
 /**
@@ -30,7 +29,7 @@ import org.solovyev.common.utils.StringUtils;
 */
 public enum HistoryItemMenuItem implements AMenuItem<HistoryItemMenuData> {
 
-	use(R.string.c_use_expression) {
+	use(R.string.c_use) {
 		@Override
 		public void doAction(@NotNull HistoryItemMenuData data, @NotNull Context context) {
 			if (context instanceof AbstractHistoryActivity) {

src/main/java/org/solovyev/android/calculator/math/edit/AbstractMathEntityListActivity.java

@@ -20,6 +20,9 @@ import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.calculator.CalculatorModel;
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.model.AndroidMathRegistry;
+import org.solovyev.android.view.AMenuBuilder;
+import org.solovyev.android.view.AMenuItem;
+import org.solovyev.android.view.MenuImpl;
 import org.solovyev.common.math.MathEntity;
 import org.solovyev.common.utils.EqualsTool;
 import org.solovyev.common.utils.Filter;
@@ -101,8 +104,27 @@ public abstract class AbstractMathEntityListActivity<T extends MathEntity> exten
                 AbstractMathEntityListActivity.this.finish();
             }
         });
+
+		getListView().setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
+			@Override
+			public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
+				final T item = (T) parent.getItemAtPosition(position);
+
+				final List<AMenuItem<T>> menuItems = getMenuItemsOnLongClick(item);
+
+				if (!menuItems.isEmpty()) {
+					final AMenuBuilder<AMenuItem<T>, T> menuBuilder = AMenuBuilder.newInstance(AbstractMathEntityListActivity.this, MenuImpl.newInstance(menuItems));
+					menuBuilder.create(item).show();
 				}
 
+				return true;
+			}
+		});
+	}
+
+	@NotNull
+	protected abstract List<AMenuItem<T>> getMenuItemsOnLongClick(@NotNull T item);
+
 	@Override
     protected void onResume() {
         super.onResume();

src/main/java/org/solovyev/android/calculator/math/edit/CalculatorFunctionsTabActivity.java

@@ -6,12 +6,20 @@
 
 package org.solovyev.android.calculator.math.edit;
 
+import android.app.Activity;
+import android.content.Context;
 import android.os.Bundle;
+import android.text.ClipboardManager;
 import jscl.math.function.Function;
 import org.jetbrains.annotations.NotNull;
+import org.solovyev.android.calculator.CalculatorModel;
+import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.model.CalculatorEngine;
+import org.solovyev.android.view.AMenuItem;
+import org.solovyev.common.utils.StringUtils;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 /**
@@ -21,6 +29,48 @@ import java.util.List;
  */
 public class CalculatorFunctionsTabActivity extends AbstractMathEntityListActivity<Function> {
 
+	private static enum LongClickMenuItem implements AMenuItem<Function>{
+		use(R.string.c_use) {
+			@Override
+			public void doAction(@NotNull Function data, @NotNull Context context) {
+				CalculatorModel.instance.processDigitButtonAction(data.getName(), false);
+				if (context instanceof Activity) {
+					((Activity) context).finish();
+				}
+			}
+		},
+
+		/*edit(R.string.c_edit) {
+			@Override
+			public void doAction(@NotNull Function data, @NotNull Context context) {
+				if (context instanceof AbstractMathEntityListActivity) {
+				}
+			}
+		},*/
+
+		copy_description(R.string.c_copy_description) {
+			@Override
+			public void doAction(@NotNull Function data, @NotNull Context context) {
+				final String text = CalculatorEngine.instance.getFunctionsRegistry().getDescription(context, data.getName());
+				if (!StringUtils.isEmpty(text)) {
+					final ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Activity.CLIPBOARD_SERVICE);
+					clipboard.setText(text);
+				}
+			}
+		};
+		private final int captionId;
+
+		LongClickMenuItem(int captionId) {
+			this.captionId = captionId;
+		}
+
+		@NotNull
+		@Override
+		public String getCaption(@NotNull Context context) {
+			return context.getString(captionId);
+		}
+	}
+
 	public static final String CREATE_FUN_EXTRA_STRING = "org.solovyev.android.calculator.math.edit.CalculatorFunctionsTabActivity_create_fun";
 
 	@Override
@@ -55,6 +105,18 @@ public class CalculatorFunctionsTabActivity extends AbstractMathEntityListActivi
 		}*/
 	}
 
+	@NotNull
+	@Override
+	protected List<AMenuItem<Function>> getMenuItemsOnLongClick(@NotNull Function item) {
+		List<AMenuItem<Function>> result = new ArrayList<AMenuItem<Function>>(Arrays.asList(LongClickMenuItem.values()));
+		
+		if ( StringUtils.isEmpty(CalculatorEngine.instance.getFunctionsRegistry().getDescription(this, item.getName())) ) {
+			result.remove(LongClickMenuItem.copy_description);
+		}
+		
+		return result;
+	}
+
 /*	private static void createEditVariableDialog(@NotNull final AbstractMathEntityListActivity<Function> activity,
 												 @Nullable final CustomFunction function,
 												 @Nullable final String name,

src/main/java/org/solovyev/android/calculator/math/edit/CalculatorOperatorsActivity.java

@@ -4,9 +4,11 @@ import android.content.Context;
 import jscl.math.operator.Operator;
 import org.jetbrains.annotations.NotNull;
 import org.solovyev.android.calculator.model.CalculatorEngine;
+import org.solovyev.android.view.AMenuItem;
 import org.solovyev.common.utils.StringUtils;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -19,6 +21,12 @@ public class CalculatorOperatorsActivity extends AbstractMathEntityListActivity<
 
 	@NotNull
 	@Override
+	protected List<AMenuItem<Operator>> getMenuItemsOnLongClick(@NotNull Operator item) {
+		return Collections.emptyList();
+	}
+
+	@NotNull
+    @Override
     protected MathEntityDescriptionGetter getDescriptionGetter() {
         return new OperatorDescriptionGetter();
     }

src/main/java/org/solovyev/android/calculator/math/edit/CalculatorVarsTabActivity.java

@@ -6,28 +6,33 @@
 
 package org.solovyev.android.calculator.math.edit;
 
+import android.app.Activity;
 import android.app.AlertDialog;
+import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
+import android.text.ClipboardManager;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.view.*;
-import android.widget.AdapterView;
 import android.widget.EditText;
 import android.widget.Toast;
 import jscl.math.function.IConstant;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.solovyev.android.calculator.CalculatorModel;
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.math.MathType;
 import org.solovyev.android.calculator.model.CalculatorEngine;
 import org.solovyev.android.calculator.model.Var;
+import org.solovyev.android.view.AMenuItem;
 import org.solovyev.common.utils.CollectionsUtils;
 import org.solovyev.common.utils.Finder;
 import org.solovyev.common.utils.StringUtils;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 /**
@@ -37,6 +42,60 @@ import java.util.List;
  */
 public class CalculatorVarsTabActivity extends AbstractMathEntityListActivity<IConstant> {
 
+	private static enum LongClickMenuItem implements AMenuItem<IConstant>{
+		use(R.string.c_use) {
+			@Override
+			public void doAction(@NotNull IConstant data, @NotNull Context context) {
+				CalculatorModel.instance.processDigitButtonAction(data.getName(), false);
+				if (context instanceof Activity) {
+					((Activity) context).finish();
+				}
+			}
+		},
+
+		edit(R.string.c_edit) {
+			@Override
+			public void doAction(@NotNull IConstant data, @NotNull Context context) {
+				if (context instanceof AbstractMathEntityListActivity) {
+					createEditVariableDialog((AbstractMathEntityListActivity<IConstant>)context, data, data.getName(), StringUtils.getNotEmpty(data.getValue(), ""), data.getDescription());
+				}
+			}
+		},
+
+		copy_value(R.string.c_copy_value) {
+			@Override
+			public void doAction(@NotNull IConstant data, @NotNull Context context) {
+				final String text = data.getValue();
+				if (!StringUtils.isEmpty(text)) {
+					final ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Activity.CLIPBOARD_SERVICE);
+					clipboard.setText(text);
+				}
+			}
+		},
+
+		copy_description(R.string.c_copy_description) {
+			@Override
+			public void doAction(@NotNull IConstant data, @NotNull Context context) {
+				final String text = CalculatorEngine.instance.getVarsRegistry().getDescription(context, data.getName());
+				if (!StringUtils.isEmpty(text)) {
+					final ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Activity.CLIPBOARD_SERVICE);
+					clipboard.setText(text);
+				}
+			}
+		};
+		private final int captionId;
+
+		LongClickMenuItem(int captionId) {
+			this.captionId = captionId;
+		}
+
+		@NotNull
+		@Override
+		public String getCaption(@NotNull Context context) {
+			return context.getString(captionId);
+		}
+	}
+	
 	public static final String CREATE_VAR_EXTRA_STRING = "org.solovyev.android.calculator.math.edit.CalculatorVarsTabActivity_create_var";
 
 	@Override
@@ -48,15 +107,6 @@ public class CalculatorVarsTabActivity extends AbstractMathEntityListActivity<IC
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 
-		getListView().setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
-			@Override
-			public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
-				final IConstant iConstant = (IConstant) parent.getItemAtPosition(position);
-				createEditVariableDialog(CalculatorVarsTabActivity.this, iConstant, iConstant.getName(), StringUtils.getNotEmpty(iConstant.getValue(), ""), iConstant.getDescription());
-				return true;
-			}
-		});
-
 		final Intent intent = getIntent();
 		if (intent != null) {
 			final String varValue = intent.getStringExtra(CREATE_VAR_EXTRA_STRING);
@@ -69,6 +119,26 @@ public class CalculatorVarsTabActivity extends AbstractMathEntityListActivity<IC
 		}
 	}
 
+	@NotNull
+	@Override
+	protected List<AMenuItem<IConstant>> getMenuItemsOnLongClick(@NotNull IConstant item) {
+		final List<AMenuItem<IConstant>> result = new ArrayList<AMenuItem<IConstant>>(Arrays.asList(LongClickMenuItem.values()));
+		
+		if ( item.isSystem() ) {
+			result.remove(LongClickMenuItem.edit);
+		}
+		
+		if ( StringUtils.isEmpty(CalculatorEngine.instance.getVarsRegistry().getDescription(this, item.getName())) ) {
+			result.remove(LongClickMenuItem.copy_description);
+		}
+
+		if ( StringUtils.isEmpty(item.getValue()) ) {
+			result.remove(LongClickMenuItem.copy_value);
+		}
+		
+		return result;
+	}
+
 	@NotNull
 	@Override
 	protected MathEntityDescriptionGetter getDescriptionGetter() {