+var added

res/layout/calc_vars_button.xml

@@ -7,7 +7,10 @@
   -->
 
 <org.solovyev.android.view.widgets.DirectionDragButton xmlns:a="http://schemas.android.com/apk/res/android"
+													   xmlns:calc="http://schemas.android.com/apk/res/org.solovyev.android.calculator"
 													   a:id="@+id/varsButton"
+													   calc:directionTextScale="0.5"
+													   calc:textUp="+π"
 													   a:text="π,…"
 													   a:textStyle="italic"
 													   a:onClick="varsButtonClickHandler"

res/values-ru/strings.xml

@@ -140,4 +140,7 @@
 	<string name="c_fun_description_lt">Меньше - возвращает 1, если первый аргумент меньше второго, иначе 0.</string>
 	<string name="c_fun_description_gt">Больше - возвращает 1, если первый аргумент больше второго, иначе 0.</string>
 
+	<string name="c_empty_var_error">Невозможно создать пустую константу!</string>
+	<string name="c_not_valid_result">Результат не валиден!</string>
+
 </resources>

res/values/strings.xml

@@ -141,4 +141,7 @@
 	<string name="c_fun_description_lt">Lesser function - gives 1 if first argument is less than second, 0 otherwise.</string>
 	<string name="c_fun_description_gt">Greater function - gives 1 if first argument is greater than second, 0 otherwise.</string>
 
+	<string name="c_empty_var_error">Unable to create empty constant!</string>
+	<string name="c_not_valid_result">Current result is not valid!</string>
+
 </resources>

src/main/java/org/solovyev/android/calculator/CalculatorActivity.java

@@ -31,6 +31,7 @@ import org.solovyev.android.view.FontSizeAdjuster;
 import org.solovyev.android.view.widgets.*;
 import org.solovyev.common.BooleanMapper;
 import org.solovyev.common.utils.Announcer;
+import org.solovyev.common.utils.Point2d;
 import org.solovyev.common.utils.history.HistoryAction;
 
 import java.lang.reflect.Field;
@@ -42,8 +43,6 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 
 	private static final int HVGA_WIDTH_PIXELS = 320;
 
-	private static final long ON_CLICK_VIBRATION_TIME = 100;
-
 	@NotNull
 	private final Announcer<DragPreferencesChangeListener> dpclRegister = new Announcer<DragPreferencesChangeListener>(DragPreferencesChangeListener.class);
 
@@ -107,11 +106,35 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 			equalsButton.setOnDragListener(evalOnDragListener);
 		}
 
+		final DragButton varsButton = (DragButton) findViewById(R.id.varsButton);
+		if (varsButton != null) {
+			final OnDragListener varsOnDragListener = new OnDragListenerVibrator(newOnDragListener(new VarsDragProcessor(), dragPreferences), vibrator, preferences);
+			varsButton.setOnDragListener(varsOnDragListener);
+		}
+
 		CalculatorEngine.instance.reset(this, preferences);
 
 		preferences.registerOnSharedPreferenceChangeListener(this);
 	}
 
+	private class VarsDragProcessor implements SimpleOnDragListener.DragProcessor {
+
+		@Override
+		public boolean processDragEvent(@NotNull DragDirection dragDirection,
+										@NotNull DragButton dragButton,
+										@NotNull Point2d startPoint2d,
+										@NotNull MotionEvent motionEvent) {
+			boolean result = false;
+
+			if (dragDirection == DragDirection.up) {
+				CalculatorActivityLauncher.createVar(CalculatorActivity.this, CalculatorActivity.this.calculatorModel);
+				result = true;
+			}
+
+			return result;
+		}
+	}
+
 	private void setDefaultValues(@NotNull SharedPreferences preferences) {
 		if (!preferences.contains(CalculatorEngine.GROUPING_SEPARATOR_P_KEY)) {
 			final Locale locale = Locale.getDefault();
@@ -246,7 +269,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void historyButtonClickHandler(@NotNull View v) {
-		this.showHistory();
+		CalculatorActivityLauncher.showHistory(this);
 	}
 
 	@SuppressWarnings({"UnusedDeclaration"})
@@ -307,12 +330,12 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void functionsButtonClickHandler(@NotNull View v) {
-		startActivity(new Intent(this, CalculatorFunctionsActivity.class));
+		CalculatorActivityLauncher.showFunctions(this);
 	}
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void varsButtonClickHandler(@NotNull View v) {
-		startActivity(new Intent(this, CalculatorVarsActivity.class));
+		CalculatorActivityLauncher.showVars(this);
 	}
 
 	private final static String paypalDonateUrl = "https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=se%2esolovyev%40gmail%2ecom&lc=RU&item_name=Android%20Calculator&currency_code=USD&bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted";
@@ -364,15 +387,15 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 
 		switch (item.getItemId()) {
 			case R.id.main_menu_item_settings:
-				showSettings();
+				CalculatorActivityLauncher.showSettings(this);
 				result = true;
 				break;
 			case R.id.main_menu_item_history:
-				showHistory();
+				CalculatorActivityLauncher.showHistory(this);
 				result = true;
 				break;
 			case R.id.main_menu_item_about:
-				showAbout();
+				CalculatorActivityLauncher.showAbout(this);
 				result = true;
 				break;
 			case R.id.main_menu_item_exit:
@@ -386,18 +409,6 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 		return result;
 	}
 
-	private void showHistory() {
-		startActivity(new Intent(this, CalculatorHistoryActivity.class));
-	}
-
-	private void showSettings() {
-		startActivity(new Intent(this, CalculatorPreferencesActivity.class));
-	}
-
-	private void showAbout() {
-		startActivity(new Intent(this, AboutActivity.class));
-	}
-
 	/**
 	 * The font sizes in the layout files are specified for a HVGA display.
 	 * Adjust the font sizes accordingly if we are running on a different

src/main/java/org/solovyev/android/calculator/CalculatorActivityLauncher.java

@@ -0,0 +1,56 @@
+package org.solovyev.android.calculator;
+
+import android.content.Context;
+import android.content.Intent;
+import android.view.View;
+import android.widget.Toast;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.solovyev.common.utils.StringUtils;
+
+/**
+ * User: serso
+ * Date: 11/2/11
+ * Time: 2:18 PM
+ */
+public class CalculatorActivityLauncher {
+
+	public static void showHistory(@NotNull final Context context) {
+		context.startActivity(new Intent(context, CalculatorHistoryActivity.class));
+	}
+
+	public static void showSettings(@NotNull final Context context) {
+		context.startActivity(new Intent(context, CalculatorPreferencesActivity.class));
+	}
+
+	public static void showAbout(@NotNull final Context context) {
+		context.startActivity(new Intent(context, AboutActivity.class));
+	}
+
+	public static void showFunctions(@NotNull final Context context) {
+		context.startActivity(new Intent(context, CalculatorFunctionsActivity.class));
+	}
+
+	public static void showVars(@NotNull final Context context) {
+		context.startActivity(new Intent(context, CalculatorVarsActivity.class));
+	}
+
+	public static void createVar(@NotNull final Context context, @NotNull CalculatorModel calculatorModel) {
+		if (calculatorModel.getDisplay().isValid() ) {
+			final String varValue = calculatorModel.getDisplay().getText().toString();
+			if (!StringUtils.isEmpty(varValue)) {
+				if (CalculatorVarsActivity.isValid(varValue)) {
+					final Intent intent = new Intent(context, CalculatorVarsActivity.class);
+					intent.putExtra(CalculatorVarsActivity.CREATE_VAR_EXTRA_STRING, varValue);
+					context.startActivity(intent);
+				} else {
+					Toast.makeText(context, R.string.c_not_valid_result, Toast.LENGTH_SHORT).show();
+				}
+			} else {
+				Toast.makeText(context, R.string.c_empty_var_error, Toast.LENGTH_SHORT).show();
+			}
+		} else {
+			Toast.makeText(context, R.string.c_not_valid_result, Toast.LENGTH_SHORT).show();
+		}
+	}
+}

src/main/java/org/solovyev/android/calculator/CalculatorModel.java

@@ -352,4 +352,9 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 	public CalculatorEditor getEditor() {
 		return editor;
 	}
+
+	@NotNull
+	public CalculatorDisplay getDisplay() {
+		return display;
+	}
 }

src/main/java/org/solovyev/android/calculator/CalculatorVarsActivity.java

@@ -10,6 +10,7 @@ import android.app.AlertDialog;
 import android.app.ListActivity;
 import android.content.Context;
 import android.content.DialogInterface;
+import android.content.Intent;
 import android.os.Bundle;
 import android.text.Editable;
 import android.text.TextWatcher;
@@ -34,6 +35,8 @@ import java.util.List;
  */
 public class CalculatorVarsActivity extends ListActivity {
 
+	public static final String CREATE_VAR_EXTRA_STRING = "org.solovyev.android.calculator.CalculatorVarsActivity_create_var";
+
 	private final static List<Character> acceptableChars = Arrays.asList(StringUtils.toObject("1234567890abcdefghijklmnopqrstuvwxyzйцукенгшщзхъфывапролджэячсмитьбюё".toCharArray()));
 
 	@NotNull
@@ -78,6 +81,14 @@ public class CalculatorVarsActivity extends ListActivity {
 			}
 		});
 
+		final Intent intent = getIntent();
+		if ( intent != null ) {
+			final String varValue = intent.getStringExtra(CREATE_VAR_EXTRA_STRING);
+			if (!StringUtils.isEmpty(varValue)) {
+				createEditVariableDialog(null, null, varValue, null);
+			}
+		}
+
 	}
 
 	@SuppressWarnings({"UnusedDeclaration"})
@@ -209,12 +220,7 @@ public class CalculatorVarsActivity extends ListActivity {
 								error = null;
 							} else {
 								// value is not empty => must be a number
-								boolean correctDouble = true;
-								try {
-									Double.valueOf(value);
-								} catch (NumberFormatException e) {
-									correctDouble = false;
-								}
+								boolean correctDouble = isValid(value);
 
 								if (correctDouble) {
 									varBuilder.setName(name);
@@ -253,6 +259,16 @@ public class CalculatorVarsActivity extends ListActivity {
 		}
 	}
 
+	public static boolean isValid(@NotNull String value) {
+		boolean valid = true;
+		try {
+			Double.valueOf(value);
+		} catch (NumberFormatException e) {
+			valid = false;
+		}
+		return valid;
+	}
+
 	private class VarsArrayAdapter extends ArrayAdapter<Var> {
 
 		private VarsArrayAdapter(Context context, int resource, int textViewResourceId, List<Var> objects) {