Draggable marker sample (#869)

vtm-android-example/src/org/oscim/android/drag/DragGestureHandler.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2013 Hannes Janetzek
+ * Copyright 2016 devemux86
+ * Copyright 2021 Frank Knoll
+ *
+ * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
+ *
+ * This program is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.oscim.android.drag;
+
+import android.view.MotionEvent;
+import org.oscim.android.input.AndroidMotionEvent;
+import org.oscim.android.input.GestureHandler;
+import org.oscim.event.Gesture;
+import org.oscim.map.Map;
+
+class DragGestureHandler extends GestureHandler {
+
+    public static final Gesture START_DRAG = new Gesture() {
+    };
+    public static final Gesture ONGOING_DRAG = new Gesture() {
+    };
+    public static final Gesture END_DRAG = new Gesture() {
+    };
+
+    private final AndroidMotionEvent mMotionEvent;
+    private final Map mMap;
+    private boolean scrolling = false;
+
+    public DragGestureHandler(Map map) {
+        super(map);
+        mMotionEvent = new AndroidMotionEvent();
+        mMap = map;
+    }
+
+    public boolean isScrolling() {
+        return scrolling;
+    }
+
+    public void setScrolling(boolean scrolling) {
+        this.scrolling = scrolling;
+    }
+
+    @Override
+    public void onShowPress(MotionEvent e) {
+        scrolling = true;
+        mMap.handleGesture(START_DRAG, mMotionEvent.wrap(e));
+    }
+
+    @Override
+    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
+        scrolling = true;
+        return mMap.handleGesture(ONGOING_DRAG, mMotionEvent.wrap(e2));
+    }
+}