LabelLayout.java 文件源码

public LabelLayout(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);

    setWillNotDraw(false);
    setAddStatesFromChildren(true);

    mInputFrame = new FrameLayout(context);
    mInputFrame.setAddStatesFromChildren(true);
    super.addView(mInputFrame, -1, generateDefaultLayoutParams());

    mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG | Paint.SUBPIXEL_TEXT_FLAG);
    mTextPaint.setTypeface(Typeface.DEFAULT);// getTypeface());
    mTextSizeCollapsed = getResources().getDimensionPixelSize(R.dimen.abc_text_size_caption_material);
    mTextSizeExpanded = getResources().getDimensionPixelSize(R.dimen.abc_text_size_medium_material);
    mTextPaint.setTextSize(mTextSizeCollapsed);

    StyledAttributesHelper ta = StyledAttributesHelper.obtainStyledAttributes(context, attrs,
            new int[] { R.attr.doNotExpand, android.R.attr.hint, android.R.attr.textColorHint });
    try {
        mDoNotExpand = ta.getBoolean(R.attr.doNotExpand, false);
        mHint = ta.getString(android.R.attr.hint);
        mTextColorUnfocused = ta.getColorStateList(android.R.attr.textColorHint);
    } finally {
        ta.recycle();
    }
    mTextColorFocused = ThemeHelper.getAccentColor(context);
    mTextPaint.setColor(mTextColorUnfocused.getColorForState(getDrawableState(), mTextColorUnfocused.getDefaultColor()));

    mAnimator = ValueAnimator.ofFloat(0.f, 1.f);
    mAnimator.setInterpolator(new LinearInterpolator());
    mAnimator.setDuration(200);
    mAnimator.addUpdateListener((ValueAnimator animation) -> {
        mAnimState = (float) animation.getAnimatedValue();
        invalidate();
    });

    updateTopMargin();
    updateTextPositions();
}