Android Open Source - yammp Text Scroll View

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Back to project page yammp.
License

The source code is released under:
GNU Lesser General Public License
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Java Source Code

package org.yammp.widget;
//from ww  w  . j a v  a2s.co m
import org.yammp.R;
import org.yammp.util.LyricsSplitter;

import android.content.Context;
import android.graphics.Color;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnLongClickListener;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TextView;

public class TextScrollView extends ScrollView implements OnLongClickListener {

  // Namespaces to read attributes
  private static final String ANDROID_NS = "http://schemas.android.com/apk/res/android";

  private static final String ATTR_TEXTSIZE = "textSize";
  private static final String ATTR_SHADOWCOLOR = "shadowColor";
  private static final String ATTR_SHADOWDX = "shadowDx";
  private static final String ATTR_SHADOWDY = "shadowDy";
  private static final String ATTR_SHADOWRADIUS = "shadowRadius";

  private LinearLayout mScrollContainer;
  private LinearLayout mContentContainer, mContentEmptyView;
  private boolean mSmoothScrolling = false;
  private boolean mEnableAutoScrolling = true;
  private int mTextColor = Color.WHITE, mShadowColor = Color.BLACK;
  private float mTextSize = 15.0f, mShadowDx = 0.0f, mShadowDy = 0.0f, mShadowRadius = 0.0f;
  private int mLastLineId = -1;
  private String[] mContent;
  private final int TIMEOUT = 1;
  public OnLineSelectedListener mListener;
  private Context mContext;

  public Handler mHandler = new Handler() {

    @Override
    public void handleMessage(Message msg) {

      switch (msg.what) {
        case TIMEOUT:
          mHandler.removeMessages(TIMEOUT);
          mEnableAutoScrolling = true;
          break;
      }
    }
  };

  public TextScrollView(Context context) {

    super(context);
    init(context);
  }

  public TextScrollView(Context context, AttributeSet attrs) {

    super(context, attrs);

    mShadowRadius = attrs.getAttributeFloatValue(ANDROID_NS, ATTR_SHADOWRADIUS, 0.0f);
    mShadowDx = attrs.getAttributeFloatValue(ANDROID_NS, ATTR_SHADOWDX, 0.0f);
    mShadowDy = attrs.getAttributeFloatValue(ANDROID_NS, ATTR_SHADOWDY, 0.0f);

    String shadow_color_value = attrs.getAttributeValue(ANDROID_NS, ATTR_SHADOWCOLOR);
    if (shadow_color_value != null) {
      if (shadow_color_value.startsWith("#")) {
        try {
          mShadowColor = Color.parseColor(shadow_color_value);
        } catch (IllegalArgumentException e) {
          Log.e("TextScrollView", "Wrong color: " + shadow_color_value);
        }
      } else if (shadow_color_value.startsWith("@")) {
        int colorResourceId = attrs.getAttributeResourceValue(ANDROID_NS, ATTR_SHADOWCOLOR,
            0);
        if (colorResourceId != 0) {
          mShadowColor = context.getResources().getColor(colorResourceId);
        }
      }
    }

    String text_size_value = attrs.getAttributeValue(ANDROID_NS, ATTR_TEXTSIZE);
    if (text_size_value != null) {
      mTextSize = parseTextSize(text_size_value);
    }

    init(context);
  }

  @Override
  public boolean onLongClick(View view) {

    if (mListener != null) {
      Object tag = view.getTag();
      int id = tag != null ? Integer.valueOf(tag.toString()) : 0;
      mListener.onLineSelected(id);
    }
    return true;
  }

  @Override
  public void onSizeChanged(int width, int height, int old_width, int old_height) {

    mContentEmptyView.setLayoutParams(new LinearLayout.LayoutParams(width, height));
    mContentContainer.setLayoutParams(new LinearLayout.LayoutParams(
        LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    mContentContainer.setPadding(0, height / 2, 0, height / 2);
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {

    switch (event.getAction()) {
      case MotionEvent.ACTION_UP:
        mHandler.sendEmptyMessageDelayed(TIMEOUT, 2000L);
        break;
      case MotionEvent.ACTION_DOWN:
        mHandler.removeMessages(TIMEOUT);
        mEnableAutoScrolling = false;
        break;
      case MotionEvent.ACTION_MOVE:
        mHandler.removeMessages(TIMEOUT);
        mEnableAutoScrolling = false;
        break;
    }
    return super.onTouchEvent(event);

  }

  public void setContentGravity(int gravity) {

    if (mContentContainer != null) {
      mContentContainer.setGravity(gravity);
    }
  }

  public void setCurrentLine(int lineid, boolean force) {

    if (findViewWithTag(mLastLineId) != null) {
      ((TextView) findViewWithTag(mLastLineId)).setTextColor(Color.argb(0xD0,
          Color.red(mTextColor), Color.green(mTextColor), Color.blue(mTextColor)));
      ((TextView) findViewWithTag(mLastLineId)).getPaint().setFakeBoldText(false);
    }

    if (findViewWithTag(lineid) != null) {
      ((TextView) findViewWithTag(lineid)).setTextColor(Color.argb(0xFF,
          Color.red(mTextColor), Color.green(mTextColor), Color.blue(mTextColor)));
      ((TextView) findViewWithTag(lineid)).getPaint().setFakeBoldText(true);
      if (mEnableAutoScrolling || force) {
        if (mSmoothScrolling) {
          smoothScrollTo(0, findViewWithTag(lineid).getTop()
              + findViewWithTag(lineid).getHeight() / 2 - getHeight() / 2);
        } else {
          scrollTo(0, findViewWithTag(lineid).getTop()
              + findViewWithTag(lineid).getHeight() / 2 - getHeight() / 2);
        }
      }
      mLastLineId = lineid;
    }

  }

  public void setLineSelectedListener(OnLineSelectedListener listener) {

    mListener = listener;
  }

  @Override
  public void setSmoothScrollingEnabled(boolean smooth) {

    mSmoothScrolling = smooth;
  }

  public void setTextColor(int color) {

    mTextColor = color;
    setTextContent(mContent);
    setCurrentLine(mLastLineId, true);
  }

  public void setTextContent(String[] content) {

    mContent = content;
    mLastLineId = -1;
    mContentContainer.removeAllViews();
    System.gc();

    if (content == null || content.length == 0) {
      mContentContainer.setVisibility(View.GONE);
      mContentEmptyView.setVisibility(View.VISIBLE);
      return;
    }

    mContentContainer.setVisibility(View.VISIBLE);
    mContentEmptyView.setVisibility(View.GONE);

    int content_id = 0;

    for (String line : content) {
      TextView mTextView = new TextView(mContext);
      mTextView.setText(LyricsSplitter.split(line, mTextView.getTextSize()));
      mTextView.setTextColor(Color.argb(0xD0, Color.red(mTextColor), Color.green(mTextColor),
          Color.blue(mTextColor)));
      float density = getResources().getDisplayMetrics().density;
      mTextView.setShadowLayer(mShadowRadius * density, mShadowDx, mShadowDy, mShadowColor);
      mTextView.setGravity(Gravity.CENTER);
      mTextView.setTextSize(mTextSize);
      mTextView.setOnLongClickListener(this);
      if (content_id < content.length) {
        mTextView.setTag(content_id);
        content_id++;
      }
      mContentContainer.addView(mTextView, new LayoutParams(LayoutParams.WRAP_CONTENT,
          LayoutParams.WRAP_CONTENT, Gravity.CENTER));
    }
    if (mSmoothScrolling) {
      smoothScrollTo(0, 0);
    } else {
      scrollTo(0, 0);
    }

  }

  public void setTextSize(float size) {

    mTextSize = size;
    setTextContent(mContent);
    setCurrentLine(mLastLineId, true);
  }

  private void init(Context context) {

    mContext = context;

    setVerticalScrollBarEnabled(false);
    mScrollContainer = new LinearLayout(context);
    mScrollContainer.setOrientation(LinearLayout.VERTICAL);
    addView(mScrollContainer, new LayoutParams(LayoutParams.MATCH_PARENT,
        LayoutParams.MATCH_PARENT));

    mContentContainer = new LinearLayout(context);
    mContentContainer.setOrientation(LinearLayout.VERTICAL);
    mContentContainer.setPadding(0, getHeight() / 2, 0, getHeight() / 2);
    mScrollContainer.addView(mContentContainer, new LayoutParams(LayoutParams.MATCH_PARENT,
        LayoutParams.WRAP_CONTENT));

    mContentEmptyView = (LinearLayout) inflate(context, R.layout.content_empty_view, null);
    mContentEmptyView.setLayoutParams(new LayoutParams(getWidth(), getHeight()));
    mScrollContainer.addView(mContentEmptyView, new LayoutParams(LayoutParams.MATCH_PARENT,
        LayoutParams.WRAP_CONTENT, Gravity.CENTER));
  }

  private float parseTextSize(String value) {
    float density = getResources().getDisplayMetrics().density;
    if (value == null) throw new IllegalArgumentException("Value cannot be null!");
    if (value.endsWith("px"))
      return Integer.parseInt(value.replaceAll("px", "")) / density;
    else if (value.endsWith("dip"))
      return Float.parseFloat(value.replaceAll("dip", ""));
    else if (value.endsWith("sp"))
      return Float.parseFloat(value.replaceAll("sp", ""));
    else
      throw new IllegalArgumentException("Value " + value + " is not valid!");
  }

  public interface OnLineSelectedListener {

    void onLineSelected(int id);
  }

}
Java Source Code List
