ingo@540: package de.intevation.flys.client.client.ui.chart;
ingo@540: 
ingo@540: import java.util.ArrayList;
ingo@540: import java.util.List;
ingo@540: 
ingo@540: import com.smartgwt.client.types.Positioning;
ingo@540: import com.smartgwt.client.types.SelectionType;
ingo@540: import com.smartgwt.client.widgets.Button;
ingo@540: import com.smartgwt.client.widgets.Canvas;
ingo@540: import com.smartgwt.client.widgets.events.MouseDownEvent;
ingo@540: import com.smartgwt.client.widgets.events.MouseDownHandler;
ingo@540: import com.smartgwt.client.widgets.events.MouseMoveEvent;
ingo@540: import com.smartgwt.client.widgets.events.MouseMoveHandler;
ingo@540: import com.smartgwt.client.widgets.events.MouseUpEvent;
ingo@540: import com.smartgwt.client.widgets.events.MouseUpHandler;
ingo@540: 
ingo@540: import de.intevation.flys.client.client.event.HasZoomHandlers;
ingo@540: import de.intevation.flys.client.client.event.ZoomEvent;
ingo@540: import de.intevation.flys.client.client.event.ZoomHandler;
ingo@540: 
ingo@540: 
ingo@540: /**
ingo@540:  * This control observes that panel retrieved by ChartOutputTab.getChartPanel().
ingo@540:  * If activated, a zoombox is drawn. One of the two edges is the position of the
ingo@540:  * mouse down event on the observed panel. The other edge is specified by the
ingo@540:  * current mouse position. If the mouse up event occurs, start and end point
ingo@540:  * relative to the left and upper border of the observed panel is determined and
ingo@540:  * a ZoomEvent is fired.
ingo@540:  *
ingo@540:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@540:  */
ingo@540: public class ZoomboxControl
ingo@540: extends      Button
ingo@540: implements   MouseDownHandler, MouseUpHandler, MouseMoveHandler, HasZoomHandlers
ingo@540: {
ingo@540:     protected List<ZoomHandler> handlers;
ingo@540: 
ingo@540:     protected ChartOutputTab chartTab;
ingo@540: 
ingo@540:     protected Canvas zoombox;
ingo@540: 
ingo@540:     protected int[] start;
ingo@540:     protected int[] end;
ingo@540: 
ingo@540: 
ingo@540:     public ZoomboxControl(ChartOutputTab chartTab) {
ingo@540:         super("Zoombox");
ingo@540: 
ingo@540:         this.handlers = new ArrayList<ZoomHandler>();
ingo@540:         this.chartTab = chartTab;
ingo@540:         this.start    = new int[2];
ingo@540:         this.end      = new int[2];
ingo@540:         this.zoombox  = new Canvas();
ingo@540: 
ingo@540:         initZoombox();
ingo@540: 
ingo@540:         setActionType(SelectionType.CHECKBOX);
ingo@540:         setSelected(false);
ingo@540: 
ingo@540:         chartTab.getChartPanel().addMouseDownHandler(this);
ingo@540:         chartTab.getChartPanel().addMouseMoveHandler(this);
ingo@540:         chartTab.getChartPanel().addMouseUpHandler(this);
ingo@540:     }
ingo@540: 
ingo@540: 
ingo@540:     /**
ingo@540:      * Initializes the zoombox that is displayed over the observed area. The
ingo@540:      * zoombox has an opaque background. Its height/width and x/y values are
ingo@540:      * determined by the start point (mouse down) and the current mouse
ingo@540:      * position.
ingo@540:      */
ingo@540:     protected void initZoombox() {
ingo@540:         zoombox.setPosition(Positioning.ABSOLUTE);
ingo@541:         zoombox.setBorder("2px solid black");
ingo@540:         zoombox.setOpacity(50);
ingo@540:         zoombox.setWidth(0);
ingo@540:         zoombox.setHeight(0);
ingo@540:     }
ingo@540: 
ingo@540: 
ingo@540:     /**
ingo@540:      * Registers a new ZoomHandler that wants to listen to ZoomEvents.
ingo@540:      *
ingo@540:      * @param handler A new ZoomHandler.
ingo@540:      */
ingo@540:     public void addZoomHandler(ZoomHandler handler) {
ingo@540:         if (handler != null) {
ingo@540:             handlers.add(handler);
ingo@540:         }
ingo@540:     }
ingo@540: 
ingo@540: 
ingo@540:     /**
ingo@540:      * A mouse down event on the specified area will set the start point for the
ingo@540:      * zoombox.
ingo@540:      *
ingo@540:      * @param event The mouse down event which contains the xy coordinates of
ingo@540:      * the observed area.
ingo@540:      */
ingo@540:     public void onMouseDown(MouseDownEvent event) {
ingo@540:         if (!isSelected()) {
ingo@540:             return;
ingo@540:         }
ingo@540: 
ingo@540:         start[0] = getRelativeX(event.getX());
ingo@540:         start[1] = getRelativeY(event.getY());
ingo@540: 
ingo@540:         end[0] = start[0];
ingo@540:         end[1] = start[1];
ingo@540: 
ingo@540:         chartTab.getChartPanel().addChild(zoombox);
ingo@540: 
ingo@540:         positionZoombox();
ingo@540:     }
ingo@540: 
ingo@540: 
ingo@540:     /**
ingo@540:      * A mouse move event on the specified area will set the end point for the
ingo@540:      * zoombox. If the end point differs from the start point, an opaque box is
ingo@540:      * displayed.
ingo@540:      *
ingo@540:      * @param event The mouse move event which contains the xy coordinates of
ingo@540:      * the observed area.
ingo@540:      */
ingo@540:     public void onMouseMove(MouseMoveEvent event) {
ingo@540:         if (!isSelected()) {
ingo@540:             return;
ingo@540:         }
ingo@540: 
ingo@540:         end[0] = getRelativeX(event.getX());
ingo@540:         end[1] = getRelativeY(event.getY());
ingo@540: 
ingo@540:         positionZoombox();
ingo@540:     }
ingo@540: 
ingo@540: 
ingo@540:     /**
ingo@540:      * The mouse up event finalizes the zoom operation. It sets the end point
ingo@540:      * for this operation, clears the zoombox and fires a ZoomEvent.
ingo@540:      *
ingo@540:      * @param event The mouse up event which contains the xy coordinates of the
ingo@540:      * observed area.
ingo@540:      */
ingo@540:     public void onMouseUp(MouseUpEvent event) {
ingo@540:         if (!isSelected()) {
ingo@540:             return;
ingo@540:         }
ingo@540: 
ingo@540:         end[0] = getRelativeX(event.getX());
ingo@540:         end[1] = getRelativeY(event.getY());
ingo@540: 
ingo@541:         fireZoomEvent();
ingo@541: 
ingo@540:         clearZoombox();
ingo@540: 
ingo@540:         chartTab.getChartPanel().removeChild(zoombox);
ingo@540:     }
ingo@540: 
ingo@540: 
ingo@540:     /**
ingo@540:      * Returns the X coordinate relative to the left border.
ingo@540:      *
ingo@540:      * @param x The X coordinate relative to the window.
ingo@540:      *
ingo@540:      * @return the X coordinate relative to the left border.
ingo@540:      */
ingo@540:     protected int getRelativeX(int x) {
ingo@540:         return x - chartTab.getChartPanel().getPageLeft();
ingo@540:     }
ingo@540: 
ingo@540: 
ingo@540:     /**
ingo@540:      * Returns the Y coordinate relative to the top border.
ingo@540:      *
ingo@540:      * @param y The Y coordinate relative to the window.
ingo@540:      *
ingo@540:      * @return the Y coordinate relative to the top border.
ingo@540:      */
ingo@540:     protected int getRelativeY(int y) {
ingo@540:         return y - chartTab.getChartPanel().getPageTop();
ingo@540:     }
ingo@540: 
ingo@540: 
ingo@540:     /**
ingo@540:      * Returns min and max x/y values based on the stored values in <i>start</i>
ingo@540:      * and <i>end</i>.
ingo@540:      *
ingo@540:      * @return an int[] as follows: [xmin, ymin, xmax, ymax].
ingo@540:      */
ingo@540:     protected int[] orderPositions() {
ingo@540:         int xmin = start[0] < end[0] ? start[0] : end[0];
ingo@540:         int ymin = start[1] < end[1] ? start[1] : end[1];
ingo@540: 
ingo@540:         int xmax = start[0] >= end[0] ? start[0] : end[0];
ingo@540:         int ymax = start[1] >= end[1] ? start[1] : end[1];
ingo@540: 
ingo@540:         return new int[] { xmin, ymin, xmax, ymax };
ingo@540:     }
ingo@540: 
ingo@540: 
ingo@540:     /**
ingo@540:      * Sets the width, height, x and y values of the zoombox.
ingo@540:      */
ingo@540:     protected void positionZoombox() {
ingo@540:         int[] values = orderPositions();
ingo@540: 
ingo@540:         zoombox.setLeft(values[0]);
ingo@540:         zoombox.setTop(values[1]);
ingo@540:         zoombox.setWidth(values[2] - values[0]);
ingo@540:         zoombox.setHeight(values[3] - values[1]);
ingo@540:     }
ingo@540: 
ingo@540: 
ingo@540:     /**
ingo@540:      * Clears the zoombox (set position and size to null).
ingo@540:      */
ingo@540:     protected void clearZoombox() {
ingo@540:         zoombox.setLeft(0);
ingo@540:         zoombox.setTop(0);
ingo@540:         zoombox.setWidth(0);
ingo@540:         zoombox.setHeight(0);
ingo@540:     }
ingo@540: 
ingo@540: 
ingo@540:     /**
ingo@540:      * Fires a ZoomEvent to all registered listeners.
ingo@540:      */
ingo@540:     protected void fireZoomEvent() {
ingo@540:         int[] pos = orderPositions();
ingo@540: 
ingo@540:         ZoomEvent event = new ZoomEvent(pos[0], pos[1], pos[2], pos[3]);
ingo@540: 
ingo@540:         for (ZoomHandler handler: handlers) {
ingo@540:             handler.onZoom(event);
ingo@540:         }
ingo@540:     }
ingo@540: }
ingo@540: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :