Android Open Source - vanilindy Drag Text View

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License

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

/*
 * Copyright (C) 2012 Christopher Eby <kreed@kreed.org>
 *//from   w ww.  j av a  2 s  .c  o  m
 * 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 ch.blinkenlights.android.vanilla;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.Checkable;
import android.widget.TextView;

/**
 * TextView that draws a divider line at the bottom.
 *
 * We draw the divider here rather than with ListView.setDivider() so we don't
 * have duplicate dividers when hiding a row for a drag.
 *
 * This also implements the Checkable interface to provide checking for
 * TabOrderActivity. CheckedTextView also provides this, but unfortunately its
 * check-mark ignores padding so it can't be used with DragListView's expansion
 * code.
 */
public class DragTextView extends TextView implements Checkable {
  private final Paint mPaint;
  private boolean mChecked;
  /**
   * Check mark drawable to update with checked state. This drawable is set
   * as the TextView's right compound drawable, so TextView will handle the
   * drawing.
   */
  private final Drawable mCheckMarkDrawable;
  /**
   * The preferred height of the view in pixels. Set to DragListView.ROW_HEIGHT.
   */
  private final int mHeight;

  private static final int[] CHECKED_STATE_SET = {
    android.R.attr.state_checked
  };

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

    Paint paint = new Paint();
    paint.setColor(0xff444444);
    mPaint = paint;
    Drawable[] drawables = getCompoundDrawables();
    mCheckMarkDrawable = drawables[2];

    float density = context.getResources().getDisplayMetrics().density;
    mHeight = (int)(DragListView.ROW_HEIGHT * density);
  }

  @Override
  public void onDraw(Canvas canvas)
  {
    int height = getHeight();
    if (height <= 1)
      return;
    super.onDraw(canvas);
    if (getDrawingCacheBackgroundColor() != DragListView.DRAG_COLOR && getPaddingBottom() < getHeight() / 2) {
      // only draw divider when not dragging
      float h = height - 1;
      canvas.drawLine(0, h, getWidth(), h, mPaint);
    }
  }

  @Override
  public boolean isChecked()
  {
    return mChecked;
  }

  @Override
  public void setChecked(boolean checked)
  {
    mChecked = checked;
    refreshDrawableState();
  }

  @Override
  public void toggle()
  {
    setChecked(!mChecked);
  }

  @Override
  protected int[] onCreateDrawableState(int extraSpace)
  {
    final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
    if (mChecked) {
      mergeDrawableStates(drawableState, CHECKED_STATE_SET);
    }
    return drawableState;
  }

  @Override
  protected void drawableStateChanged()
  {
    super.drawableStateChanged();

    if (mCheckMarkDrawable != null) {
      int[] myDrawableState = getDrawableState();
      mCheckMarkDrawable.setState(myDrawableState);
      invalidate();
    }
  }

  @Override
  public void onMeasure(int widthSpec, int heightSpec)
  {
    setMeasuredDimension(MeasureSpec.getSize(widthSpec), resolveSize(mHeight, heightSpec));
  }
}
Java Source Code List
