PagedDragDropGrid.java

/**
 * Copyright 2012 
 * 
 * Nicolas Desjardins  
 * https://github.com/mrKlar
 * 
 * Facilite solutions
 * http://www.facilitesolutions.com/
 * 
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package ca.laplanete.mobile.pageddragdropgrid;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.HorizontalScrollView;

public class PagedDragDropGrid extends HorizontalScrollView implements PagedContainer {

    private int mActivePage = 0;
	private DragDropGrid grid;
	private PagedDragDropGridAdapter adapter;
    private OnClickListener listener;

    public PagedDragDropGrid(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initPagedScroll();
        initGrid();
    }
 
    public PagedDragDropGrid(Context context, AttributeSet attrs) {
        super(context, attrs);
        initPagedScroll();
        initGrid();
    }
 
    public PagedDragDropGrid(Context context) {
        super(context);
        initPagedScroll();
        initGrid();
    }
 
    public PagedDragDropGrid(Context context, AttributeSet attrs, int defStyle, PagedDragDropGridAdapter adapter) {
        super(context, attrs, defStyle);
        this.adapter = adapter;
        initPagedScroll();
        initGrid();   
    }
 
    public PagedDragDropGrid(Context context, AttributeSet attrs, PagedDragDropGridAdapter adapter) {
        super(context, attrs);
        this.adapter = adapter;
        initPagedScroll();
        initGrid();   
    }
 
    public PagedDragDropGrid(Context context, PagedDragDropGridAdapter adapter) {
        super(context);
        this.adapter = adapter;
        initPagedScroll();        
        initGrid();    	
    }

	private void initGrid() {
		grid = new DragDropGrid(getContext());
    	addView(grid);
	}
 
    public void initPagedScroll(){
    	
    	setScrollBarStyle(SCROLLBARS_INSIDE_OVERLAY);

        setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if(event.getAction() == MotionEvent.ACTION_UP || event.getAction() == MotionEvent.ACTION_CANCEL ){
                    int scrollX = getScrollX();                    
                    int onePageWidth = v.getMeasuredWidth();
                    int page = ((scrollX + (onePageWidth/2))/onePageWidth);
                    scrollToPage(page);
                    return true;
                } else{
                    return false;
                }
            }
        });
    }
    
    public void setAdapter(PagedDragDropGridAdapter adapter) {
    	this.adapter = adapter;
		grid.setAdapter(adapter);
		grid.setContainer(this);
	}
    
    public void setClickListener(OnClickListener l) {
        this.listener = l;
        grid.setOnClickListener(l);
    }
    
    public boolean onLongClick(View v) {
        return grid.onLongClick(v);
    }

    public void notifyDataSetChanged() {
        removeAllViews();
        initGrid();
        grid.setAdapter(adapter);
        grid.setContainer(this);
        grid.setOnClickListener(listener);
    }

	@Override
	public void scrollToPage(int page) {
		mActivePage = page;
		int onePageWidth = getMeasuredWidth();
		int scrollTo = page*onePageWidth;
        smoothScrollTo(scrollTo, 0);
	}

	@Override
	public void scrollLeft() {		
		int newPage = mActivePage-1;
		if (canScrollToPreviousPage()) {
			scrollToPage(newPage);
		}
	}

	@Override
	public void scrollRight() {
		int newPage = mActivePage+1;
		if (canScrollToNextPage()) {		
			scrollToPage(newPage);
		}
	}

	@Override
	public int currentPage() {
		return mActivePage;
	}

	@Override
	public void enableScroll() {
		requestDisallowInterceptTouchEvent(false);
	}

	@Override
	public void disableScroll() {
		requestDisallowInterceptTouchEvent(true);
	}

	@Override
	public boolean canScrollToNextPage() {
		int newPage = mActivePage+1;
		return (newPage < adapter.pageCount());
	}

	@Override
	public boolean canScrollToPreviousPage() {
		int newPage = mActivePage-1;
		return (newPage >= 0);
	}	
}