KeyboardView.java 文件源码

protected void drawKeyPopupHint(@Nonnull final Key key, @Nonnull final Canvas canvas,
        @Nonnull final Paint paint, @Nonnull final KeyDrawParams params) {
    if (TextUtils.isEmpty(mKeyPopupHintLetter)) {
        return;
    }
    final int keyWidth = key.getDrawWidth();
    final int keyHeight = key.getHeight();

    paint.setTypeface(params.mTypeface);
    paint.setTextSize(params.mHintLetterSize);
    paint.setColor(params.mHintLabelColor);
    paint.setTextAlign(Align.CENTER);
    final float hintX = keyWidth - mKeyHintLetterPadding
            - TypefaceUtils.getReferenceCharWidth(paint) / 2.0f;
    final float hintY = keyHeight - mKeyPopupHintLetterPadding;
    canvas.drawText(mKeyPopupHintLetter, hintX, hintY, paint);
}