Android Open Source - GuiLib Floating Hint Text View

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License

The source code is released under:

Apache License

Java Source Code

package com.thebnich.floatinghintedittext;
//ww  w. jav  a 2 s.c  om
import android.content.Context;
import android.content.res.ColorStateList;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.widget.TextView;

import com.gandulf.guilib.R;

public class FloatingHintTextView extends TextView {

  private final Paint mFloatingHintPaint = new Paint();
  private final ColorStateList mHintColors;
  private final int mHintSize;

  private CharSequence mHint;

  public FloatingHintTextView(Context context) {
    this(context, null);
  }

  public FloatingHintTextView(Context context, AttributeSet attrs) {
    this(context, attrs, R.attr.floatingHintTextViewStyle);
  }

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

    mHintSize = getResources().getDimensionPixelSize(R.dimen.floatinghintedittext_hint_size);
    mHintColors = getHintTextColors();
  }

  @Override
  public int getCompoundPaddingTop() {
    return super.getCompoundPaddingTop() + mHintSize;
  }

  protected void convertHint() {
    if (getHint() != null) {
      mHint = getHint();
      setHint(null);
    }
  }

  @Override
  public boolean onPreDraw() {
    convertHint();
    return super.onPreDraw();
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    convertHint();
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  }

  @Override
  protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    convertHint();
    super.onLayout(changed, left, top, right, bottom);
  }

  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    if (TextUtils.isEmpty(mHint)) {
      return;
    }

    mFloatingHintPaint.set(getPaint());
    mFloatingHintPaint.setColor(mHintColors.getColorForState(getDrawableState(), mHintColors.getDefaultColor()));

    final float hintPosX = getCompoundPaddingLeft() + getScrollX();
    final float normalHintPosY = getBaseline();
    final float floatingHintPosY = normalHintPosY + getPaint().getFontMetricsInt().top + getScrollY();

    // If we're not animating, we're showing the floating hint, so draw it and bail.
    mFloatingHintPaint.setTextSize(mHintSize);
    canvas.drawText(mHint.toString(), hintPosX, floatingHintPosY, mFloatingHintPaint);

  }

}

Java Source Code List

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