/*
* This is part of Geomajas, a GIS framework, http://www.geomajas.org/.
*
* Copyright 2008-2011 Geosparc nv, http://www.geosparc.com/, Belgium.
*
* The program is available in open source according to the GNU Affero
* General Public License. All contributions in this program are covered
* by the Geomajas Contributors License Agreement. For full licensing
* details, see LICENSE.txt in the project root.
*/
package org.geomajas.gwt.client.controller;
import org.geomajas.geometry.Coordinate;
import org.geomajas.gwt.client.map.MapView.ZoomOption;
import org.geomajas.gwt.client.spatial.Bbox;
import org.geomajas.gwt.client.widget.MapWidget;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.event.dom.client.DoubleClickEvent;
import com.google.gwt.event.dom.client.MouseDownEvent;
import com.google.gwt.event.dom.client.MouseEvent;
import com.google.gwt.event.dom.client.MouseMoveEvent;
import com.google.gwt.event.dom.client.MouseOutEvent;
import com.google.gwt.event.dom.client.MouseUpEvent;
import com.smartgwt.client.types.Cursor;
/**
* Handle panning by dragging the map. Also allows zoom to rectangle when using shift or ctrl when you start to drag.
* Double clicking allows the user to zoom in on the clicked location.
*
* @author Joachim Van der Auwera
* @author Pieter De Graef
*/
public class PanController extends AbstractGraphicsController {
private boolean zooming;
private boolean dragging;
private boolean moving;
private boolean showCursorOnMove;
private Coordinate begin;
private ZoomToRectangleController zoomToRectangleController;
private Coordinate lastClickPosition;
// Constructors:
public PanController(MapWidget mapWidget) {
super(mapWidget);
zoomToRectangleController = new ZoomToRectangleController(mapWidget);
}
/**
* Should the cursor only be shown when mouse is dragged (defaults to false) ?
*
* @return true if to be shown on drag
*/
public boolean isShowCursorOnMove() {
return showCursorOnMove;
}
/**
* If set to true, the move cursor is only shown when the mouse is dragged.
*
* @param showCursorOnMove
* true if cursor should be shown on move (defaults to false)
*/
public void setShowCursorOnMove(boolean showCursorOnMove) {
this.showCursorOnMove = showCursorOnMove;
}
@Override
public void onMouseDown(MouseDownEvent event) {
if (event.isControlKeyDown() || event.isShiftKeyDown()) {
zooming = true;
zoomToRectangleController.onMouseDown(event);
} else if (event.getNativeButton() != NativeEvent.BUTTON_RIGHT) {
dragging = true;
mapWidget.getMapModel().getMapView().setPanDragging(true);
begin = getScreenPosition(event);
if (!isShowCursorOnMove()) {
mapWidget.setCursor(Cursor.MOVE);
}
}
lastClickPosition = getWorldPosition(event);
}
@Override
public void onMouseUp(MouseUpEvent event) {
if (zooming) {
zoomToRectangleController.onMouseUp(event);
zooming = false;
} else if (dragging) {
stopPanning(event);
}
}
@Override
public void onMouseMove(MouseMoveEvent event) {
if (zooming) {
zoomToRectangleController.onMouseMove(event);
} else if (dragging) {
if (!moving && isShowCursorOnMove()) {
mapWidget.setCursor(Cursor.MOVE);
}
moving = true;
updateView(event);
}
}
@Override
public void onMouseOut(MouseOutEvent event) {
if (zooming) {
zoomToRectangleController.onMouseOut(event);
} else {
stopPanning(null);
}
}
/**
* Zoom in to the double-clicked position.
*/
public void onDoubleClick(DoubleClickEvent event) {
// Zoom in on the event location.
Bbox bounds = mapWidget.getMapModel().getMapView().getBounds();
double x = lastClickPosition.getX() - (bounds.getWidth() / 4);
double y = lastClickPosition.getY() - (bounds.getHeight() / 4);
Bbox newBounds = new Bbox(x, y, bounds.getWidth() / 2, bounds.getHeight() / 2);
mapWidget.getMapModel().getMapView().applyBounds(newBounds, ZoomOption.LEVEL_CHANGE);
}
public boolean isMoving() {
return moving;
}
// Private methods:
private void stopPanning(MouseUpEvent event) {
mapWidget.getMapModel().getMapView().setPanDragging(false);
dragging = false;
moving = false;
mapWidget.setCursor(Cursor.DEFAULT);
if (null != event) {
updateView(event);
}
}
private void updateView(MouseEvent<?> event) {
Coordinate end = getScreenPosition(event);
Coordinate beginWorld = getTransformer().viewToWorld(begin);
Coordinate endWorld = getTransformer().viewToWorld(end);
mapWidget.getMapModel().getMapView().translate(beginWorld.getX() - endWorld.getX(),
beginWorld.getY() - endWorld.getY());
begin = end;
}
@Override
public void onDeactivate() {
super.onDeactivate();
zoomToRectangleController.onDeactivate();
}
}