Draggable marker sample (#869)

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

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+/*
+ * Copyright 2021 Frank Knoll
+ *
+ * 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 org.oscim.core.GeoPoint;
+
+public interface DragAndDropListener {
+
+    void startDragItemAtGeoPoint(DraggableMarkerItem item, GeoPoint geoPoint);
+
+    void ongoingDragItemToGeoPoint(DraggableMarkerItem item, GeoPoint geoPoint);
+
+    void dropItemAtGeoPoint(DraggableMarkerItem item, GeoPoint geoPoint);
+}

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

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+/*
+ * 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));
+    }
+}

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

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+/*
+ * Copyright 2012 Hannes Janetzek
+ * Copyright 2016-2020 devemux86
+ * Copyright 2018-2019 Gustl22
+ * 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.content.Context;
+import android.util.AttributeSet;
+import android.view.GestureDetector;
+import org.oscim.android.MapView;
+import org.oscim.map.Map;
+import org.oscim.utils.Parameters;
+
+public class DragMapView extends MapView {
+
+    private DragGestureHandler gestureHandler;
+
+    public DragMapView(Context context) {
+        super(context);
+    }
+
+    public DragMapView(Context context, AttributeSet attributeSet) {
+        super(context, attributeSet);
+
+        if (!Parameters.MAP_EVENT_LAYER2) {
+            gestureHandler = new DragGestureHandler(mMap);
+            mGestureDetector = new GestureDetector(context, gestureHandler);
+            mGestureDetector.setOnDoubleTapListener(gestureHandler);
+        }
+    }
+
+    @Override
+    public boolean onTouchEvent(android.view.MotionEvent motionEvent) {
+        if (!isClickable()) {
+            return false;
+        }
+
+        if (motionEvent.getAction() == android.view.MotionEvent.ACTION_UP) {
+            if (gestureHandler.isScrolling()) {
+                gestureHandler.setScrolling(false);
+                return ((Map) mMap).handleGesture(DragGestureHandler.END_DRAG, mMotionEvent.wrap(motionEvent));
+            }
+        }
+
+        return super.onTouchEvent(motionEvent);
+    }
+}

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

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+/*
+ * Copyright 2012 osmdroid authors: Nicolas Gramlich, Theodore Hong, Fred Eisele
+ *
+ * Copyright 2013 Hannes Janetzek
+ * Copyright 2016-2021 devemux86
+ * Copyright 2016 Stephan Leuschner
+ * Copyright 2016 Pedinel
+ * Copyright 2019 Carlos Alberto Martínez Gadea
+ * 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 org.oscim.core.GeoPoint;
+import org.oscim.event.Gesture;
+import org.oscim.event.GestureListener;
+import org.oscim.event.MotionEvent;
+import org.oscim.layers.marker.ItemizedLayer;
+import org.oscim.layers.marker.MarkerInterface;
+import org.oscim.layers.marker.MarkerSymbol;
+import org.oscim.map.Map;
+
+import java.util.List;
+
+import static org.oscim.android.drag.DragGestureHandler.*;
+
+public class DraggableItemizedLayer extends ItemizedLayer implements GestureListener {
+
+    private final ItemDragger itemDragger;
+
+    public DraggableItemizedLayer(Map map,
+                                  List<MarkerInterface> markerItems,
+                                  MarkerSymbol defaultMarker,
+                                  OnItemGestureListener<MarkerInterface> listener) {
+        super(map, markerItems, defaultMarker, listener);
+        itemDragger = new ItemDragger(this, map);
+    }
+
+    @Override
+    protected boolean activateSelectedItems(MotionEvent event, ActiveItem task) {
+        return super.activateSelectedItems(event, task);
+    }
+
+    protected List<MarkerInterface> getMarkerItems() {
+        return mItemList;
+    }
+
+    @Override
+    public boolean onGesture(Gesture gesture, MotionEvent event) {
+        if (!isEnabled()) {
+            return false;
+        }
+
+        if (gesture == START_DRAG) {
+            return itemDragger.startDragItem(event, getGeoPoint(event));
+        } else if (gesture == ONGOING_DRAG) {
+            return itemDragger.ongoingDragItemTo(getGeoPoint(event));
+        } else if (gesture == END_DRAG) {
+            return itemDragger.dropItemAt(getGeoPoint(event));
+        } else {
+            itemDragger.noDrag();
+        }
+
+        return super.onGesture(gesture, event);
+    }
+
+    private GeoPoint getGeoPoint(MotionEvent event) {
+        return map().viewport().fromScreenPoint(event.getX(), event.getY());
+    }
+}

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

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2012 osmdroid authors:
+ * Copyright 2012 Nicolas Gramlich
+ * Copyright 2012 Theodore Hong
+ * Copyright 2012 Fred Eisele
+ *
+ * Copyright 2014 Hannes Janetzek
+ * Copyright 2016 devemux86
+ * Copyright 2016 Erik Duisters
+ * Copyright 2017 Longri
+ * 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 org.oscim.core.GeoPoint;
+import org.oscim.layers.marker.MarkerItem;
+
+public class DraggableMarkerItem extends MarkerItem {
+
+    private final DragAndDropListener dragAndDropListener;
+
+    public DraggableMarkerItem(String title, String description, GeoPoint geoPoint, DragAndDropListener dragAndDropListener) {
+        super(title, description, geoPoint);
+        this.dragAndDropListener = dragAndDropListener;
+    }
+
+    public DragAndDropListener getDragAndDropListener() {
+        return dragAndDropListener;
+    }
+}

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

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+/*
+ * Copyright 2021 Frank Knoll
+ *
+ * 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 org.oscim.core.GeoPoint;
+import org.oscim.event.MotionEvent;
+import org.oscim.layers.marker.ItemizedLayer;
+import org.oscim.layers.marker.MarkerItem;
+import org.oscim.layers.marker.MarkerLayer;
+import org.oscim.map.Map;
+
+class ItemDragger {
+
+    private final DraggableItemizedLayer draggableItemizedLayer;
+    private final DragAndDropListener dragItemAndRedrawListener;
+    private DraggableMarkerItem dragItem;
+
+    public ItemDragger(DraggableItemizedLayer draggableItemizedLayer, Map map) {
+        this.draggableItemizedLayer = draggableItemizedLayer;
+        this.dragItemAndRedrawListener = createDragItemAndRedrawListener(draggableItemizedLayer, map);
+    }
+
+    public boolean startDragItem(MotionEvent event, final GeoPoint geoPoint) {
+        dragItem = null;
+        return draggableItemizedLayer.activateSelectedItems(
+                event,
+                new ItemizedLayer.ActiveItem() {
+                    @Override
+                    public boolean run(int index) {
+                        dragItem = (DraggableMarkerItem) draggableItemizedLayer.getMarkerItems().get(index);
+                        dragItemAndRedrawListener.startDragItemAtGeoPoint(dragItem, geoPoint);
+                        return true;
+                    }
+                });
+    }
+
+    public boolean ongoingDragItemTo(GeoPoint geoPoint) {
+        if (dragItem == null) {
+            return false;
+        }
+        dragItemAndRedrawListener.ongoingDragItemToGeoPoint(dragItem, geoPoint);
+        return true;
+    }
+
+    public boolean dropItemAt(GeoPoint geoPoint) {
+        if (dragItem == null) {
+            return false;
+        }
+        dragItemAndRedrawListener.dropItemAtGeoPoint(dragItem, geoPoint);
+        return true;
+    }
+
+    public void noDrag() {
+        dragItem = null;
+    }
+
+    private DragAndDropListener createDragItemAndRedrawListener(final MarkerLayer markerLayer, final Map map) {
+        return new DragAndDropListener() {
+            @Override
+            public void startDragItemAtGeoPoint(DraggableMarkerItem item, GeoPoint geoPoint) {
+                item.getDragAndDropListener().startDragItemAtGeoPoint(item, geoPoint);
+                updateLocationOfMarkerItemAndRedraw(item, geoPoint);
+            }
+
+            @Override
+            public void ongoingDragItemToGeoPoint(DraggableMarkerItem item, GeoPoint geoPoint) {
+                item.getDragAndDropListener().ongoingDragItemToGeoPoint(item, geoPoint);
+                updateLocationOfMarkerItemAndRedraw(item, geoPoint);
+            }
+
+            @Override
+            public void dropItemAtGeoPoint(DraggableMarkerItem item, GeoPoint geoPoint) {
+                item.getDragAndDropListener().dropItemAtGeoPoint(item, geoPoint);
+                updateLocationOfMarkerItemAndRedraw(item, geoPoint);
+            }
+
+            private void updateLocationOfMarkerItemAndRedraw(MarkerItem markerItem, GeoPoint location) {
+                markerItem.geoPoint = location;
+                markerLayer.populate();
+                map.render();
+            }
+        };
+    }
+}