Android Open Source - RSSReader Paged Drag Drop Grid

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License

The source code is released under:
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Java Source Code

/**
 * Copyright 2012 //from  w w  w  .j  a v a2 s. co  m
 * 
 * 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 ca.laplanete.mobile.example.ExampleActivity;
import ca.laplanete.mobile.example.ExamplePagedDragDropGridAdapter;

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

public class PagedDragDropGrid extends HorizontalScrollView implements
    PagedContainer, OnGestureListener {

  private static final int FLING_VELOCITY = 500;
  private int activePage = 0;
  private boolean activePageRestored = false;

  private DragDropGrid grid;
  private PagedDragDropGridAdapter adapter;
  private OnClickListener listener;
  private GestureDetector gestureScanner;
  ExamplePagedDragDropGridAdapter eadapter;
  private OnPageChangedListener pageChangedListener;
  private int xmlRes;


  public PagedDragDropGrid(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);

    setBackground(attrs);
    initPagedScroll();
    initGrid();
  }

  public PagedDragDropGrid(Context context, AttributeSet attrs) {
    super(context, attrs);

    setBackground(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);

    setBackground(attrs);

    this.adapter = adapter;
    initPagedScroll();
    initGrid();
  }

  public PagedDragDropGrid(Context context, AttributeSet attrs,
      PagedDragDropGridAdapter adapter) {
    super(context, attrs);

    setBackground(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());
    grid.setBackgroundResource(xmlRes);
    addView(grid);

  }

  private void setBackground(AttributeSet attrs) {
    final String xmlns = "http://schemas.android.com/apk/res/android";
    xmlRes = attrs.getAttributeResourceValue(xmlns, "background", -1);
  }

  public void initPagedScroll() {

    setScrollBarStyle(SCROLLBARS_INSIDE_OVERLAY);

    if (!isInEditMode()) {
      gestureScanner = new GestureDetector(getContext(), this);
    }

    setOnTouchListener(new View.OnTouchListener() {
      @Override
      public boolean onTouch(View v, MotionEvent event) {
        boolean specialEventUsed = gestureScanner.onTouchEvent(event);
        if (!specialEventUsed
            && (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 specialEventUsed;
        }
      }
    });
  }

  public void setOnPageChangedListener(OnPageChangedListener listener) {
    this.pageChangedListener = listener;
  }

  public void setAdapter(PagedDragDropGridAdapter adapter) {
    this.adapter = adapter;
    grid.setAdapter(adapter);
    grid.setContainer(this);
  }

  public void setClickListener(ExampleActivity exampleActivity) {
    this.listener = (OnClickListener) exampleActivity;
    grid.setOnClickListener(exampleActivity);
  }

  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) {
    activePage = page;
    int onePageWidth = getMeasuredWidth();
    int scrollTo = page * onePageWidth;
    smoothScrollTo(scrollTo, 0);

    pageChangedListener.onPageChanged(this, page);
  }

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

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

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

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

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

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

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

  public void restoreCurrentPage(int currentPage) {
    activePage = currentPage;
    activePageRestored = true;
  }

  @Override
  protected void onLayout(boolean changed, int l, int t, int r, int b) {
    super.onLayout(changed, l, t, r, b);

    if (activePageRestored) {
      activePageRestored = false;
      scrollToRestoredPage();
    }
  }

  private void scrollToRestoredPage() {
    scrollToPage(activePage);
  }

  @Override
  public boolean onDown(MotionEvent arg0) {
    return false;
  }

  @Override
  public boolean onFling(MotionEvent evt1, MotionEvent evt2, float velocityX,
      float velocityY) {
    if (velocityX < -FLING_VELOCITY) {
      scrollRight();
      return true;
    } else if (velocityX > FLING_VELOCITY) {
      scrollLeft();
      return true;
    }
    return false;
  }

  @Override
  public void onLongPress(MotionEvent arg0) {
  }

  @Override
  public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2,
      float arg3) {
    return false;
  }

  @Override
  public void onShowPress(MotionEvent arg0) {
  }

  @Override
  public boolean onSingleTapUp(MotionEvent arg0) {
    return false;
  }

  public void refreshView(Context context, PagedDragDropGrid gridview) {
    ExamplePagedDragDropGridAdapter aadapter = new ExamplePagedDragDropGridAdapter(
        context, gridview);
    gridview.setAdapter(aadapter);
  }
}
Java Source Code List
