Android Open Source - infinitep Auto Resize Text View

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License

The source code is released under:
Apache License
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Java Source Code

package es.daconstenla.infinip.unused;
/*ww w.ja va  2s  . c o  m*/
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.RectF;
import android.os.Build;
import android.text.Layout.Alignment;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.Log;
import android.util.SparseIntArray;
import android.util.TypedValue;
import android.widget.TextView;

public class AutoResizeTextView extends TextView {
  private interface SizeTester {
    /**
     * 
     * @param suggestedSize
     *            Size of text to be tested
     * @param availableSpace
     *            available space in which text must fit
     * @return an integer < 0 if after applying {@code suggestedSize} to
     *         text, it takes less space than {@code availableSpace}, > 0
     *         otherwise
     */
    public int onTestSize(int suggestedSize, RectF availableSpace);
  }

  private RectF mTextRect = new RectF();

  private RectF mAvailableSpaceRect;

  private SparseIntArray mTextCachedSizes;

  private TextPaint mPaint;

  private float mMaxTextSize;

  private float mSpacingMult = 1.0f;

  private float mSpacingAdd = 0.0f;

  private float mMinTextSize = 20;

  private int mWidthLimit;

  private static final int NO_LINE_LIMIT = -1;
  private int mMaxLines;

  private boolean mEnableSizeCache = true;
  private boolean mInitiallized;

  public AutoResizeTextView(Context context) {
    super(context);
    initialize();
  }

  public AutoResizeTextView(Context context, AttributeSet attrs) {
    super(context, attrs);
    initialize();
  }

  public AutoResizeTextView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    initialize();
  }

  private void initialize() {
    mPaint = new TextPaint(getPaint());
    mMaxTextSize = getTextSize();
    mAvailableSpaceRect = new RectF();
    mTextCachedSizes = new SparseIntArray();
    if (mMaxLines == 0) {
      // no value was assigned during construction
      mMaxLines = NO_LINE_LIMIT;
    }
    mInitiallized = true;
  }

  @Override
  public void setText(final CharSequence text, BufferType type) {
    super.setText(text, type);
    adjustTextSize(text.toString());
  }

  @Override
  public void setTextSize(float size) {
    mMaxTextSize = size;
    mTextCachedSizes.clear();
    adjustTextSize(getText().toString());
    
  }

  @Override
  public void setMaxLines(int maxlines) {
    super.setMaxLines(maxlines);
    mMaxLines = maxlines;
    reAdjust();
  }

  public int getMaxLines() {
    return mMaxLines;
  }

  @Override
  public void setSingleLine() {
    super.setSingleLine();
    mMaxLines = 1;
    reAdjust();
  }

  @Override
  public void setSingleLine(boolean singleLine) {
    super.setSingleLine(singleLine);
    if (singleLine) {
      mMaxLines = 1;
    } else {
      mMaxLines = NO_LINE_LIMIT;
    }
    reAdjust();
  }

  @Override
  public void setLines(int lines) {
    super.setLines(lines);
    mMaxLines = lines;
    reAdjust();
  }

  @Override
  public void setTextSize(int unit, float size) {
    Context c = getContext();
    Resources r;

    if (c == null)
      r = Resources.getSystem();
    else
      r = c.getResources();
    mMaxTextSize = TypedValue.applyDimension(unit, size,
        r.getDisplayMetrics());
    
    mTextCachedSizes.clear();
    adjustTextSize(getText().toString());
  }

  @Override
  public void setLineSpacing(float add, float mult) {
    super.setLineSpacing(add, mult);
    mSpacingMult = mult;
    mSpacingAdd = add;
  }

  /**
   * Set the lower text size limit and invalidate the view
   * 
   * @param minTextSize
   */
   public void setMinTextSize(float minTextSize) {
     mMinTextSize = minTextSize;
     reAdjust();
   }

   private void reAdjust() {
     adjustTextSize(getText().toString());
   }

   private void adjustTextSize(String string) {
     if (!mInitiallized) {
       return;
     }
     int startSize = (int) mMinTextSize;
     int heightLimit = getMeasuredHeight() - getCompoundPaddingBottom()
         - getCompoundPaddingTop();
     if(heightLimit==0)heightLimit = getHeight();
     mWidthLimit = getMeasuredWidth() - getCompoundPaddingLeft()
         - getCompoundPaddingRight();
     if(mWidthLimit == 0) mWidthLimit = getWidth();
     
     mAvailableSpaceRect.right = mWidthLimit;
     mAvailableSpaceRect.bottom = heightLimit;
     
    //TODO delete
    Log.d(this.getClass().getName(),"maxSize : "+mMaxTextSize);
    Log.d(this.getClass().getName(),"w : "+mWidthLimit+" h : "+heightLimit);
    
    super.setTextSize(
         TypedValue.COMPLEX_UNIT_PX,
         efficientTextSizeSearch(startSize, (int) mMaxTextSize,
             mSizeTester, mAvailableSpaceRect));
   }

   private final SizeTester mSizeTester = new SizeTester() {
     @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
     @Override
     public int onTestSize(int suggestedSize, RectF availableSPace) {
       mPaint.setTextSize(suggestedSize);
       String text = getText().toString();
       boolean singleline = getMaxLines() == 1;
       if (singleline) {
         mTextRect.bottom = mPaint.getFontSpacing();
         mTextRect.right = mPaint.measureText(text);
       } else {
         StaticLayout layout = new StaticLayout(text, mPaint,
             mWidthLimit, Alignment.ALIGN_NORMAL, mSpacingMult,
             mSpacingAdd, true);
         // return early if we have more lines
             if (getMaxLines() != NO_LINE_LIMIT
             && layout.getLineCount() > getMaxLines()) {
               return 1;
             }
             mTextRect.bottom = layout.getHeight();
             int maxWidth = -1;
             for (int i = 0; i < layout.getLineCount(); i++) {
               if (maxWidth < layout.getLineWidth(i)) {
                 maxWidth = (int) layout.getLineWidth(i);
               }
             }
             mTextRect.right = maxWidth;
       }

       mTextRect.offsetTo(0, 0);
       if (availableSPace.contains(mTextRect)) {
         // may be too small, don't worry we will find the best match
         return -1;
       } else {
         // too big
         return 1;
       }
     }
   };

   /**
    * Enables or disables size caching, enabling it will improve performance
    * where you are animating a value inside TextView. This stores the font
    * size against getText().length() Be careful though while enabling it as 0
    * takes more space than 1 on some fonts and so on.
    * 
    * @param enable
    *            enable font size caching
    */
   public void enableSizeCache(boolean enable) {
     mEnableSizeCache = enable;
     mTextCachedSizes.clear();
     adjustTextSize(getText().toString());
   }

   private int efficientTextSizeSearch(int start, int end,
       SizeTester sizeTester, RectF availableSpace) {
     if (!mEnableSizeCache) {
       return binarySearch(start, end, sizeTester, availableSpace);
     }
     String text = getText().toString();
     int key = text == null ? 0 : text.length();
     int size = mTextCachedSizes.get(key);
     if (size != 0) {
       return size;
     }
     size = binarySearch(start, end, sizeTester, availableSpace);
     mTextCachedSizes.put(key, size);
     return size;
   }

   private static int binarySearch(int start, int end, SizeTester sizeTester,
       RectF availableSpace) {
     int lastBest = start;
     int lo = start;
     int hi = end - 1;
     int mid = 0;
     while (lo <= hi) {
       mid = (lo + hi) >>> 1;
               int midValCmp = sizeTester.onTestSize(mid, availableSpace);
               if (midValCmp < 0) {
                 lastBest = lo;
                 lo = mid + 1;
               } else if (midValCmp > 0) {
                 hi = mid - 1;
                 lastBest = hi;
               } else {
                 return mid;
               }
     }
     // make sure to return last best
     // this is what should always be returned
     return lastBest;

   }

   @Override
   protected void onTextChanged(final CharSequence text, final int start,
       final int before, final int after) {
     super.onTextChanged(text, start, before, after);
     reAdjust();
   }

   @Override
   protected void onSizeChanged(int width, int height, int oldwidth,
       int oldheight) {
     mTextCachedSizes.clear();
     super.onSizeChanged(width, height, oldwidth, oldheight);
     if (width != oldwidth || height != oldheight) {
       reAdjust();
     }
   }
}
Java Source Code List
