ch.unifr.pai.twice.mousecontrol.client.TouchPadNintendoDS.java Source code

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Here is the source code for ch.unifr.pai.twice.mousecontrol.client.TouchPadNintendoDS.java

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package ch.unifr.pai.twice.mousecontrol.client;

/*
 * Copyright 2013 Oliver Schmid
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import java.util.Date;

import com.google.gwt.dom.client.Style.Position;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.Window.ScrollEvent;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.web.bindery.event.shared.HandlerRegistration;

/**
 * The mouse control with Nintendo 3DS is quite different: The device has two screens where one of them is interactive while the other is not. We therefore need
 * a special layout and listen to scroll events instead of touch / cursor events.
 * 
 * @author Oliver Schmid
 * 
 */
public class TouchPadNintendoDS extends TouchPadWidget {

    private final HTML focus = new HTML();
    Label l = new Label();
    long lastScroll = -1;
    long scrollThreshold = 1000;
    private final static int eventsAfterReset = 3;

    int currentX = -1;
    int currentY = -1;
    int left;
    int top;
    int skipEvents = 0;

    Timer updater;
    long lastUpdate = -1;
    long timerThreshold = 200;
    boolean reset;
    boolean dontProcess;

    int currentScreenX;
    int currentScreenY;

    HandlerRegistration windowScrollHandler;

    public TouchPadNintendoDS() {
        super(false);
        add(focus);
        setWidth("2000px");
        setHeight("2000px");
        add(l);
        l.setWidth("200px");
        l.setHeight("200px");
        l.getElement().getStyle().setPosition(Position.ABSOLUTE);
        l.getElement().getStyle().setZIndex(200);
        updater = new Timer() {

            @Override
            public void run() {
                if (skipEvents == 0) {
                    left = RootPanel.getBodyElement().getScrollLeft();
                    top = RootPanel.getBodyElement().getScrollTop();
                    if (currentX == -1 || currentY == -1) {
                        currentX = left;
                        currentY = top;
                    } else if (left != currentX || top != currentY) {
                        // l.getElement().getStyle().setDisplay(Display.NONE);
                        // focus.setVisible(false);
                        int dX = currentX - left;
                        int dY = currentY - top;
                        currentX = left;
                        currentY = top;
                        updatePos(dX, dY);
                        lastUpdate = new Date().getTime();

                    }
                    // else if (lastUpdate != -1
                    // && new Date().getTime() - lastUpdate > timerThreshold) {
                    // lastUpdate = -1;
                    // currentX = -1;
                    // currentY = -1;
                    // skipEvents = eventsAfterReset;
                    // Window.scrollTo(1000, 1000);
                    // l.getElement().getStyle().setDisplay(Display.BLOCK);
                    // focus.setVisible(true);
                    // }
                }
            }
        };

    }

    /*
     * (non-Javadoc)
     * @see ch.unifr.pai.twice.mousecontrol.client.TouchPadWidget#getX()
     */
    @Override
    protected int getX() {
        return currentScreenX;
    }

    /*
     * (non-Javadoc)
     * @see ch.unifr.pai.twice.mousecontrol.client.TouchPadWidget#getY()
     */
    @Override
    protected int getY() {
        return currentScreenY;
    }

    /*
     * (non-Javadoc)
     * @see ch.unifr.pai.twice.mousecontrol.client.TouchPadWidget#updateScreenDimensions()
     */
    @Override
    protected void updateScreenDimensions() {
    }

    private void updatePos(int dX, int dY) {
        if (dX != 0) {
            int changeX = (int) Math.floor((dX * MOVEFACTOR));
            currentScreenX = Math.max(Math.min(currentScreenX + changeX, screenWidth), 0);
        }
        if (dY != 0) {
            int changeY = (int) Math.floor((dY * MOVEFACTOR));
            currentScreenY = Math.max(Math.min(currentScreenY + changeY, screenHeight), 0);
        }

    }

    /*
     * (non-Javadoc)
     * @see ch.unifr.pai.twice.mousecontrol.client.TouchPadWidget#start()
     */
    @Override
    public void start() {
        super.start();
        if (windowScrollHandler != null)
            windowScrollHandler.removeHandler();
        windowScrollHandler = Window.addWindowScrollHandler(new Window.ScrollHandler() {

            @Override
            public void onWindowScroll(ScrollEvent event) {
                if (skipEvents > 0)
                    skipEvents--;
                l.getElement().getStyle().setLeft(RootPanel.getBodyElement().getScrollLeft(), Unit.PX);
                l.getElement().getStyle().setTop(RootPanel.getBodyElement().getScrollTop(), Unit.PX);
            }
        });
        Timer t2 = new Timer() {

            @Override
            public void run() {
                skipEvents = eventsAfterReset;
                Window.scrollTo(1000, 1000);
                updater.scheduleRepeating(50);
            }
        };
        t2.schedule(1000);
    }

    /*
     * (non-Javadoc)
     * @see ch.unifr.pai.twice.mousecontrol.client.TouchPadWidget#stop()
     */
    @Override
    public void stop() {
        super.stop();
        updater.cancel();
        if (windowScrollHandler != null)
            windowScrollHandler.removeHandler();
    }

    /*
     * (non-Javadoc)
     * @see ch.unifr.pai.twice.mousecontrol.client.TouchPadWidget#attachToRootPanel()
     */
    @Override
    public boolean attachToRootPanel() {
        return true;
    }

}