teichmann@5835: package org.dive4elements.river.client.client.ui.chart;
ingo@551: 
ingo@551: import java.util.ArrayList;
ingo@551: import java.util.List;
ingo@551: 
ingo@551: import com.google.gwt.core.client.GWT;
ingo@551: 
ingo@551: import com.smartgwt.client.types.SelectionType;
ingo@551: import com.smartgwt.client.widgets.Canvas;
ingo@553: import com.smartgwt.client.widgets.Img;
ingo@551: import com.smartgwt.client.widgets.ImgButton;
ingo@551: import com.smartgwt.client.widgets.events.MouseDownEvent;
ingo@551: import com.smartgwt.client.widgets.events.MouseDownHandler;
ingo@551: import com.smartgwt.client.widgets.events.MouseMoveEvent;
ingo@551: import com.smartgwt.client.widgets.events.MouseMoveHandler;
ingo@551: import com.smartgwt.client.widgets.events.MouseOutEvent;
ingo@551: import com.smartgwt.client.widgets.events.MouseOutHandler;
ingo@551: import com.smartgwt.client.widgets.events.MouseUpEvent;
ingo@551: import com.smartgwt.client.widgets.events.MouseUpHandler;
ingo@551: 
teichmann@5835: import org.dive4elements.river.client.client.event.HasPanHandlers;
teichmann@5835: import org.dive4elements.river.client.client.event.PanEvent;
teichmann@5835: import org.dive4elements.river.client.client.event.PanHandler;
ingo@551: 
ingo@551: 
ingo@551: /**
ingo@551:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@551:  */
ingo@551: public class PanControl
ingo@551: extends      ImgButton
ingo@551: implements   MouseDownHandler, MouseMoveHandler, MouseUpHandler,
ingo@551:              MouseOutHandler, HasPanHandlers
ingo@551: {
ingo@551:     protected ChartOutputTab chartTab;
ingo@551: 
ingo@551:     protected List<PanHandler> handlers;
ingo@551: 
ingo@551:     protected int[] start;
ingo@551:     protected int[] end;
ingo@551: 
ingo@551: 
ingo@551:     public PanControl(ChartOutputTab chartTab, String imageUrl) {
ingo@551:         super();
ingo@551: 
ingo@551:         this.chartTab = chartTab;
ingo@551:         this.handlers = new ArrayList<PanHandler>();
ingo@551:         this.start    = new int[] { -1, -1 };
ingo@551:         this.end      = new int[] { -1, -1 };
ingo@551: 
ingo@551:         String baseUrl = GWT.getHostPageBaseURL();
ingo@551:         setSrc(baseUrl + imageUrl);
ingo@551:         setActionType(SelectionType.CHECKBOX);
ingo@551:         setSize(20);
ingo@551:         setShowRollOver(false);
ingo@551:         setSelected(false);
ingo@551: 
ingo@551:         chartTab.getChartPanel().addMouseDownHandler(this);
ingo@551:         chartTab.getChartPanel().addMouseMoveHandler(this);
ingo@551:         chartTab.getChartPanel().addMouseUpHandler(this);
ingo@551:         chartTab.getChartPanel().addMouseOutHandler(this);
ingo@551:     }
ingo@551: 
ingo@551: 
ingo@551:     /**
ingo@551:      * Method used to register a new PanHandler.
ingo@551:      *
ingo@551:      * @param handler A new PanHandler.
ingo@551:      */
ingo@551:     public void addPanHandler(PanHandler handler) {
ingo@551:         if (handler != null) {
ingo@551:             handlers.add(handler);
ingo@551:         }
ingo@551:     }
ingo@551: 
ingo@551: 
ingo@551:     /**
ingo@551:      * This event starts the dragging operation if the control is activated.
ingo@551:      *
ingo@551:      * @param event The mouse down event which contains the start coordinates.
ingo@551:      */
ingo@551:     public void onMouseDown(MouseDownEvent event) {
ingo@551:         if (!isSelected()) {
ingo@551:             return;
ingo@551:         }
ingo@551: 
ingo@551:         start[0] = event.getX();
ingo@551:         start[1] = event.getY();
ingo@551: 
ingo@551:         end[0] = start[0];
ingo@551:         end[1] = start[1];
ingo@551:     }
ingo@551: 
ingo@551: 
ingo@551:     /**
ingo@551:      * This event is used to reposition the chart image based on the current
ingo@551:      * drag operation.
ingo@551:      *
ingo@551:      * @param event The move event which contains the new coordinates to update
ingo@551:      * the chart image position.
ingo@551:      */
ingo@551:     public void onMouseMove(MouseMoveEvent event) {
ingo@551:         if (!isSelected() || start[0] == -1 || start[1] == -1) {
ingo@551:             return;
ingo@551:         }
ingo@551: 
ingo@551:         int x = event.getX() - end[0];
ingo@551:         int y = event.getY() - end[1];
ingo@551: 
ingo@551:         end[0] = end[0] + x;
ingo@551:         end[1] = end[1] + y;
ingo@551: 
ingo@610:         Canvas c = chartTab.getChartImg();
ingo@551:         c.moveBy(x, y);
ingo@551:     }
ingo@551: 
ingo@551: 
ingo@551:     /**
ingo@551:      * This event stops the dragging operation and fires a DragEnd event to the
ingo@551:      * registered listeners.
ingo@551:      *
ingo@551:      * @param event The mouse up event which contains the end coordinates.
ingo@551:      */
ingo@551:     public void onMouseUp(MouseUpEvent event) {
ingo@551:         if (!isSelected()) {
ingo@551:             return;
ingo@551:         }
ingo@551: 
ingo@551:         end[0] = event.getX();
ingo@551:         end[1] = event.getY();
ingo@551: 
ingo@610:         Canvas c = chartTab.getChartImg();
ingo@610:         c.setLeft(0);
ingo@610:         c.setTop(0);
ingo@551: 
ingo@551:         fireOnPan();
ingo@551: 
ingo@551:         start[0] = -1;
ingo@551:         start[1] = -1;
ingo@551:     }
ingo@551: 
ingo@551: 
ingo@551:     /**
ingo@551:      * This event is used to cancel the current dragging operation.
ingo@551:      *
ingo@551:      * @param event The mouse out event.
ingo@551:      */
ingo@551:     public void onMouseOut(MouseOutEvent event) {
ingo@553:         int x = event.getX();
ingo@553:         int y = event.getY();
ingo@553: 
ingo@553:         if (!isSelected() || !isMouseOut(x, y) || start[0] == -1) {
ingo@553:             return;
ingo@553:         }
ingo@553: 
ingo@610:         Canvas c = chartTab.getChartImg();
ingo@610:         c.setLeft(0);
ingo@610:         c.setTop(0);
ingo@553: 
ingo@553:         fireOnPan();
ingo@553: 
ingo@553:         start[0] = -1;
ingo@553:         start[1] = -1;
ingo@553:     }
ingo@553: 
ingo@553: 
ingo@553:     /**
ingo@553:      * This method is required to check manually if the mouse pointer really
ingo@553:      * moves out the chart area. The MouseOutEvent is also fired if the mouse
ingo@553:      * goes down which doesn't seem to be correct. So, we gonna check this
ingo@553:      * manually.
ingo@553:      *
ingo@553:      * @param x The x coordinate.
ingo@553:      * @param y The y coordinate.
ingo@553:      *
ingo@553:      * @return true, if the mouse is really out of the chart area, otherwise
ingo@553:      * false.
ingo@553:      */
ingo@553:     protected boolean isMouseOut(int x, int y) {
ingo@610:         Canvas chart = chartTab.getChartImg();
ingo@553: 
ingo@553:         if (chart instanceof Img) {
ingo@553:             chart = chart.getParentElement();
ingo@553:         }
ingo@553: 
ingo@553:         int left   = chart.getPageLeft();
ingo@553:         int right  = chart.getPageRight();
ingo@553:         int top    = chart.getPageTop();
ingo@553:         int bottom = chart.getPageBottom();
ingo@553: 
ingo@553:         if (x <= left || x >= right || y <= top || y >= bottom) {
ingo@553:             return true;
ingo@553:         }
ingo@553: 
ingo@553:         return false;
ingo@551:     }
ingo@551: 
ingo@551: 
ingo@551:     /**
ingo@551:      * A pan event is fired to inform the registered listeners about a pan
ingo@551:      * operation has finished.
ingo@551:      */
ingo@551:     protected void fireOnPan() {
ingo@551:         PanEvent event = new PanEvent(start, end);
ingo@551: 
ingo@551:         for (PanHandler handler: handlers) {
ingo@551:             handler.onPan(event);
ingo@551:         }
ingo@551:     }
ingo@551: }
ingo@551: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :