com.gwtmobile.ui.client.widgets.SlidePanel.java Source code

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Here is the source code for com.gwtmobile.ui.client.widgets.SlidePanel.java

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/*
 * Copyright (c) 2010 Zhihua (Dennis) Jiang
 * 
 * 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.
 */

package com.gwtmobile.ui.client.widgets;

import java.beans.Beans;
import java.util.ArrayList;
import java.util.Iterator;

import com.google.gwt.event.logical.shared.HasValueChangeHandlers;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.HasWidgets;
import com.google.gwt.user.client.ui.Widget;
import com.gwtmobile.ui.client.CSS.StyleNames.Primary;
import com.gwtmobile.ui.client.event.DragController;
import com.gwtmobile.ui.client.event.SwipeEvent;
import com.gwtmobile.ui.client.event.SwipeEventsHandler;
import com.gwtmobile.ui.client.page.Transition;

public class SlidePanel extends PanelBase implements SwipeEventsHandler, HasValueChangeHandlers<Boolean> {

    protected int _count = 0;
    private int _currentSlideIndex = 0;
    protected SlideProvider _slideProvider = null;
    protected ArrayList<Widget> _slides = new ArrayList<Widget>();
    protected boolean _rotate = false;
    private int _selectedSlideIndex = 0; //used for design time slide selection.
    HasWidgetsImpl _hasWidgetsImpl;

    public SlidePanel() {
        setStyleName(Primary.SlidePanel);
        _hasWidgetsImpl = new HasWidgetsImpl();
    }

    // expose parent HasWidgets logic for transition
    private class HasWidgetsImpl implements HasWidgets {

        @Override
        public void add(Widget w) {
            SlidePanel.super.add(w);
        }

        @Override
        public void clear() {
            SlidePanel.super.clear();
        }

        @Override
        public Iterator<Widget> iterator() {
            return SlidePanel.super.iterator();
        }

        @Override
        public boolean remove(Widget w) {
            return SlidePanel.super.remove(w);
        }

    }

    @Override
    protected String getDesignTimeMessage() {
        return "Add Slide widgets to the panel. Use the 'selectedSlideIndex' property to switch slide at design time.";
    }

    public void setSlideCount(int count) {
        this._count = count;
    }

    public int getSlideCount() {
        return _count > 0 ? _count : _slides.size();
    }

    public void setSlideProvider(SlideProvider provider) {
        _slideProvider = provider;
    }

    public SlideProvider getSlideProvider() {
        return _slideProvider;
    }

    @Override
    public void onInitialLoad() {
        super.onInitialLoad();
        // Use currentSlide as design time slide selector.
        if (Beans.isDesignTime()) {
            _currentSlideIndex = _selectedSlideIndex;
        }
        Slide slide = getSlide(_currentSlideIndex);
        if (slide != null) {
            super.add(slide);
        }
    }

    public Slide getSlide(int index) {
        Slide slide = null;
        if (_slideProvider != null) {
            slide = _slideProvider.loadSlide(index);
        }
        if (slide == null && index < _slides.size()) {
            slide = (Slide) _slides.get(index);
        }
        return slide;
    }

    @Override
    public void onLoad() {
        super.onLoad();
        DragController.get().addSwipeEventsHandler(this);
    }

    @Override
    protected void onUnload() {
        DragController.get().removeSwipeEventHandler(this);
        super.onUnload();
    }

    @Override
    public void onSwipeHorizontal(SwipeEvent e) {
        if (e.getSpeed() < 0) { //swipe to next
            next();
        } else { //swipe to previous
            previous();
        }
    }

    @Override
    public void onSwipeVertical(SwipeEvent e) {
    }

    public void next() {
        if (_currentSlideIndex >= getSlideCount() - 1) {
            if (!_rotate) {
                return;
            } else {
                _currentSlideIndex = -1;
            }
        }
        moveToSlide(_currentSlideIndex + 1);
    }

    public void previous() {
        if (_currentSlideIndex <= 0) {
            if (!_rotate) {
                return;
            } else {
                _currentSlideIndex = getSlideCount();
            }
        }
        moveToSlide(_currentSlideIndex - 1);
    }

    protected void moveToSlide(int slide) {
        boolean reverse = _currentSlideIndex > slide;
        _currentSlideIndex = slide;
        Slide to = getSlide(slide);
        Slide from = (Slide) super.getWidget(0);
        Transition transition = Transition.SLIDE;
        ValueChangeEvent.fire(this, false);
        transition.start(from, to, _hasWidgetsImpl, reverse);
    }

    public void goTo(int to) {
        if (to > 0 && to < getSlideCount()) {
            moveToSlide(to);
        }
    }

    @Override
    public void add(Widget w) {
        if (w instanceof Slide) {
            _slides.add(w);
        } else if (isDesignTimeEmptyLabel(w)) {
            super.add(w);
        } else {
            assert (w instanceof Slide) : "Can only add Slide widgets to SlidePanel.";
        }
    }

    public void setRotate(boolean rotate) {
        this._rotate = rotate;
    }

    public boolean isRotate() {
        return _rotate;
    }

    public void setCurrentSlideIndex(int currentSlideIndex) {
        this._currentSlideIndex = currentSlideIndex;
    }

    public int getCurrentSlideIndex() {
        return _currentSlideIndex;
    }

    public void setSelectedSlideIndex(int selectedSlideIndex) {
        this._selectedSlideIndex = selectedSlideIndex;
    }

    public int getSelectedSlideIndex() {
        return _selectedSlideIndex;
    }

    /********************* interface SlideProvider *******************/

    public interface SlideProvider {
        Slide loadSlide(int index);
    }

    @Override
    public HandlerRegistration addValueChangeHandler(ValueChangeHandler<Boolean> handler) {
        return this.addHandler(handler, ValueChangeEvent.getType());
    }

}