Support following a way in PathCreationActionMode

Fixes #1936

src/main/java/de/blau/android/DisambiguationMenu.java

@@ -187,6 +187,19 @@ public void add(int id, @Nullable Type type, @NonNull String text, boolean selec
         add(new DisambiguationMenuItem(type, s), listener);
     }
 
+    /**
+     * Add a menu item
+     * 
+     * @param id an id (unused)
+     * @param the Type of object
+     * @param text a descriptive text
+     * @param listener callback when the menu item is selected
+     */
+    public void add(int id, @Nullable Type type, @NonNull String text,  @NonNull final OnMenuItemClickListener listener) { // NOSONAR
+        SpannableString s = new SpannableString(text);
+        add(new DisambiguationMenuItem(type, s), listener);
+    }
+
     /**
      * Add a menu item
      * 
@@ -212,7 +225,7 @@ public void add(int id, @Nullable Type type, @NonNull int textRes, boolean selec
     public void add(int id, @Nullable Type type, @NonNull SpannableString text, boolean selected, @NonNull final OnMenuItemClickListener listener) { // NOSONAR
         add(new DisambiguationMenuItem(type, text), listener);
     }
-
+    
     /**
      * Add a menu item
      * 

src/main/java/de/blau/android/util/MathUtil.java

@@ -0,0 +1,31 @@
+package de.blau.android.util;
+
+/**
+ * Android doesn't have floor mode before API 24
+ */
+public final class MathUtil {
+
+    /**
+     * Private constructor
+     */
+    private MathUtil() {
+        // empty
+    }
+
+    /**
+     * Floor modulus 
+     * 
+     * See Math.floorMod
+     * 
+     * @param x dividend 
+     * @param y dividor
+     * @return the floor modulus of x and y
+     */
+    public static int floorMod(int x, int y) {
+        int r = x / y;
+        if ((x ^ y) < 0 && (r * y != x)) {
+            r--;
+        }
+        return x - r * y;
+    }    
+}

src/main/res/values/attrs.xml

@@ -50,6 +50,7 @@
     <attr name="menu_bridge" format="reference" />
     <attr name="menu_culvert" format="reference" />
     <attr name="menu_steps" format="reference" />
+    <attr name="menu_follow" format="reference" />
 	<attr name="alert_dialog" format="reference" />
     <attr name="lightbulb_dialog" format="reference" />
 	<attr name="undolist_undo" format="reference" />

src/main/res/values/shortcuts.xml

@@ -17,4 +17,5 @@
     <string name="shortcut_merge">m</string>
     <string name="shortcut_square">s</string>
     <string name="shortcut_remove">r</string>
+    <string name="shortcut_follow">f</string>
 </resources>

src/main/res/values/strings.xml

@@ -1081,6 +1081,7 @@
     <string name="actionmode_nodeselect">Node selected</string>
     <string name="actionmode_relationselect">Relation selected</string>
     <string name="actionmode_createpath">Creating path</string>
+    <string name="actionmode_createpath_follow_way">Follow way</string>
     <string name="actionmode_multiselect">Multiselect</string>
     <string name="actionmode_newnoteselect">New Note selected</string>
     <string name="actionmode_add_segment">Add segment</string>
@@ -1104,11 +1105,15 @@
     <string name="actionmode_restriction_split_via">Split \"via\" segment</string>
     <string name="actionmode_extract_segment_select">Select segment</string>
     <string name="actionmode_extract_segment_set_tags">Set tags</string>
+    <string name="actionmode_createpath_follow_way_select_end_node">Select end node</string>
     <plurals name="actionmode_object_count">
         <item quantity="one">1 object</item>
         <item quantity="other">%1$d objects</item>
     </plurals>
     <string name="actionmode_rotateway">Rotate way</string>
+    <string name="menu_snap">Snap</string>
+    <string name="menu_follow_way">Follow way</string>
+    <string name="select_follow_way">Select way to follow</string>
     <!-- Simple Action Mode -->
     <string name="menu_add_node">Add node</string>
     <string name="simple_add_node">Tap the screen position</string>
@@ -1125,7 +1130,6 @@
     <string name="simple_paste">Tap the screen position</string>
     <string name="menu_paste_multiple">Paste multiple times</string>
     <string name="simple_paste_multiple">Tap the screen position</string>
-    <string name="menu_snap">Snap</string>
     <!--  Preferences -->
     <string name="config_backgroundLayer_title">Map background</string>
     <string name="config_backgroundLayer_summary">The tile based map background.</string>

src/main/res/values/styles.xml

@@ -185,6 +185,7 @@
         <item name="menu_bridge">@drawable/bridge_dark</item>
         <item name="menu_culvert">@drawable/culvert_dark</item>
         <item name="menu_steps">@drawable/steps_dark</item>
+        <item name="menu_follow">@drawable/follow_dark</item>
 		<item name="undolist_undo">@drawable/undolist_undo_dark</item>
 		<item name="undolist_redo">@drawable/undolist_redo_dark</item>
 		<item name="alert_dialog">@drawable/ic_action_warning_holo_dark</item>
@@ -263,6 +264,7 @@
         <item name="menu_bridge">@drawable/bridge_light</item>
         <item name="menu_culvert">@drawable/culvert_light</item>
         <item name="menu_steps">@drawable/steps_light</item>
+        <item name="menu_follow">@drawable/follow_light</item>
 		<item name="undolist_undo">@drawable/undolist_undo_light</item>
 		<item name="undolist_redo">@drawable/undolist_redo_light</item>
 		<item name="alert_dialog">@drawable/ic_action_warning_holo_light</item>