view flys-client/src/main/java/de/intevation/flys/client/client/ui/chart/PanControl.java @ 5462:f2371f3aaf03

Show top level folder icons only if node has no factory If you have an empty folder the folder icon is still shown. This makes it possible to add functional "Top Level" entries in the Datacage
author Andre Heinecke <aheinecke@intevation.de>
date Tue, 26 Mar 2013 18:29:13 +0100
parents 80626c4a5bbf
children
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package de.intevation.flys.client.client.ui.chart;

import java.util.ArrayList;
import java.util.List;

import com.google.gwt.core.client.GWT;

import com.smartgwt.client.types.SelectionType;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Img;
import com.smartgwt.client.widgets.ImgButton;
import com.smartgwt.client.widgets.events.MouseDownEvent;
import com.smartgwt.client.widgets.events.MouseDownHandler;
import com.smartgwt.client.widgets.events.MouseMoveEvent;
import com.smartgwt.client.widgets.events.MouseMoveHandler;
import com.smartgwt.client.widgets.events.MouseOutEvent;
import com.smartgwt.client.widgets.events.MouseOutHandler;
import com.smartgwt.client.widgets.events.MouseUpEvent;
import com.smartgwt.client.widgets.events.MouseUpHandler;

import de.intevation.flys.client.client.event.HasPanHandlers;
import de.intevation.flys.client.client.event.PanEvent;
import de.intevation.flys.client.client.event.PanHandler;


/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class PanControl
extends      ImgButton
implements   MouseDownHandler, MouseMoveHandler, MouseUpHandler,
             MouseOutHandler, HasPanHandlers
{
    protected ChartOutputTab chartTab;

    protected List<PanHandler> handlers;

    protected int[] start;
    protected int[] end;


    public PanControl(ChartOutputTab chartTab, String imageUrl) {
        super();

        this.chartTab = chartTab;
        this.handlers = new ArrayList<PanHandler>();
        this.start    = new int[] { -1, -1 };
        this.end      = new int[] { -1, -1 };

        String baseUrl = GWT.getHostPageBaseURL();
        setSrc(baseUrl + imageUrl);
        setActionType(SelectionType.CHECKBOX);
        setSize(20);
        setShowRollOver(false);
        setSelected(false);

        chartTab.getChartPanel().addMouseDownHandler(this);
        chartTab.getChartPanel().addMouseMoveHandler(this);
        chartTab.getChartPanel().addMouseUpHandler(this);
        chartTab.getChartPanel().addMouseOutHandler(this);
    }


    /**
     * Method used to register a new PanHandler.
     *
     * @param handler A new PanHandler.
     */
    public void addPanHandler(PanHandler handler) {
        if (handler != null) {
            handlers.add(handler);
        }
    }


    /**
     * This event starts the dragging operation if the control is activated.
     *
     * @param event The mouse down event which contains the start coordinates.
     */
    public void onMouseDown(MouseDownEvent event) {
        if (!isSelected()) {
            return;
        }

        start[0] = event.getX();
        start[1] = event.getY();

        end[0] = start[0];
        end[1] = start[1];
    }


    /**
     * This event is used to reposition the chart image based on the current
     * drag operation.
     *
     * @param event The move event which contains the new coordinates to update
     * the chart image position.
     */
    public void onMouseMove(MouseMoveEvent event) {
        if (!isSelected() || start[0] == -1 || start[1] == -1) {
            return;
        }

        int x = event.getX() - end[0];
        int y = event.getY() - end[1];

        end[0] = end[0] + x;
        end[1] = end[1] + y;

        Canvas c = chartTab.getChartImg();
        c.moveBy(x, y);
    }


    /**
     * This event stops the dragging operation and fires a DragEnd event to the
     * registered listeners.
     *
     * @param event The mouse up event which contains the end coordinates.
     */
    public void onMouseUp(MouseUpEvent event) {
        if (!isSelected()) {
            return;
        }

        end[0] = event.getX();
        end[1] = event.getY();

        Canvas c = chartTab.getChartImg();
        c.setLeft(0);
        c.setTop(0);

        fireOnPan();

        start[0] = -1;
        start[1] = -1;
    }


    /**
     * This event is used to cancel the current dragging operation.
     *
     * @param event The mouse out event.
     */
    public void onMouseOut(MouseOutEvent event) {
        int x = event.getX();
        int y = event.getY();

        if (!isSelected() || !isMouseOut(x, y) || start[0] == -1) {
            return;
        }

        Canvas c = chartTab.getChartImg();
        c.setLeft(0);
        c.setTop(0);

        fireOnPan();

        start[0] = -1;
        start[1] = -1;
    }


    /**
     * This method is required to check manually if the mouse pointer really
     * moves out the chart area. The MouseOutEvent is also fired if the mouse
     * goes down which doesn't seem to be correct. So, we gonna check this
     * manually.
     *
     * @param x The x coordinate.
     * @param y The y coordinate.
     *
     * @return true, if the mouse is really out of the chart area, otherwise
     * false.
     */
    protected boolean isMouseOut(int x, int y) {
        Canvas chart = chartTab.getChartImg();

        if (chart instanceof Img) {
            chart = chart.getParentElement();
        }

        int left   = chart.getPageLeft();
        int right  = chart.getPageRight();
        int top    = chart.getPageTop();
        int bottom = chart.getPageBottom();

        if (x <= left || x >= right || y <= top || y >= bottom) {
            return true;
        }

        return false;
    }


    /**
     * A pan event is fired to inform the registered listeners about a pan
     * operation has finished.
     */
    protected void fireOnPan() {
        PanEvent event = new PanEvent(start, end);

        for (PanHandler handler: handlers) {
            handler.onPan(event);
        }
    }
}
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