Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.graphics.Typeface;

import android.text.Spannable;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.TextPaint;
import android.text.TextUtils;
import android.text.style.CharacterStyle;
import android.text.style.StyleSpan;
import android.text.style.UnderlineSpan;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class Main {
    private static final float MIN_TEXT_XSCALE = 0.70f;
    private static final CharacterStyle BOLD_SPAN = new StyleSpan(Typeface.BOLD);
    private static final CharacterStyle UNDERLINE_SPAN = new UnderlineSpan();

    @Nullable
    private static CharSequence getEllipsizedTextWithSettingScaleX(@Nullable final CharSequence text,
            final int maxWidth, @Nonnull final TextPaint paint) {
        if (text == null) {
            return null;
        }
        final float scaleX = getTextScaleX(text, maxWidth, paint);
        if (scaleX >= MIN_TEXT_XSCALE) {
            paint.setTextScaleX(scaleX);
            return text;
        }

        // <code>text</code> must be ellipsized with minimum text scale x.
        paint.setTextScaleX(MIN_TEXT_XSCALE);
        final boolean hasBoldStyle = hasStyleSpan(text, BOLD_SPAN);
        final boolean hasUnderlineStyle = hasStyleSpan(text, UNDERLINE_SPAN);
        // TextUtils.ellipsize erases any span object existed after ellipsized point.
        // We have to restore these spans afterward.
        final CharSequence ellipsizedText = TextUtils.ellipsize(text, paint, maxWidth, TextUtils.TruncateAt.MIDDLE);
        if (!hasBoldStyle && !hasUnderlineStyle) {
            return ellipsizedText;
        }
        final Spannable spannableText = (ellipsizedText instanceof Spannable) ? (Spannable) ellipsizedText
                : new SpannableString(ellipsizedText);
        if (hasBoldStyle) {
            addStyleSpan(spannableText, BOLD_SPAN);
        }
        if (hasUnderlineStyle) {
            addStyleSpan(spannableText, UNDERLINE_SPAN);
        }
        return spannableText;
    }

    private static float getTextScaleX(@Nullable final CharSequence text, final int maxWidth,
            final TextPaint paint) {
        paint.setTextScaleX(1.0f);
        final int width = getTextWidth(text, paint);
        if (width <= maxWidth || maxWidth <= 0) {
            return 1.0f;
        }
        return maxWidth / (float) width;
    }

    private static boolean hasStyleSpan(@Nullable final CharSequence text, final CharacterStyle style) {
        if (text instanceof Spanned) {
            return ((Spanned) text).getSpanStart(style) >= 0;
        }
        return false;
    }

    private static void addStyleSpan(@Nonnull final Spannable text, final CharacterStyle style) {
        text.removeSpan(style);
        text.setSpan(style, 0, text.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
    }

    private static int getTextWidth(@Nullable final CharSequence text, final TextPaint paint) {
        if (TextUtils.isEmpty(text)) {
            return 0;
        }
        final int length = text.length();
        final float[] widths = new float[length];
        final int count;
        final Typeface savedTypeface = paint.getTypeface();
        try {
            paint.setTypeface(getTextTypeface(text));
            count = paint.getTextWidths(text, 0, length, widths);
        } finally {
            paint.setTypeface(savedTypeface);
        }
        int width = 0;
        for (int i = 0; i < count; i++) {
            width += Math.round(widths[i] + 0.5f);
        }
        return width;
    }

    private static Typeface getTextTypeface(@Nullable final CharSequence text) {
        return hasStyleSpan(text, BOLD_SPAN) ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT;
    }
}