| /* |
| * Copyright (C) 2013 Google Inc. |
| * Licensed to 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. |
| */ |
| |
| package com.android.mail.ui; |
| |
| import android.content.Context; |
| import android.text.Layout; |
| import android.text.Layout.Alignment; |
| import android.text.SpannableStringBuilder; |
| import android.text.Spanned; |
| import android.text.StaticLayout; |
| import android.text.TextUtils; |
| import android.util.AttributeSet; |
| import android.widget.TextView; |
| |
| /** |
| * A special MultiLine TextView that will apply ellipsize logic to only the last |
| * line of text, such that the last line may be shorter than any previous lines. |
| */ |
| public class EllipsizedMultilineTextView extends TextView { |
| |
| public static final int ALL_AVAILABLE = -1; |
| private int mMaxLines; |
| |
| public EllipsizedMultilineTextView(Context context) { |
| this(context, null); |
| } |
| |
| public EllipsizedMultilineTextView(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| } |
| |
| @Override |
| public void setMaxLines(int maxlines) { |
| super.setMaxLines(maxlines); |
| mMaxLines = maxlines; |
| } |
| |
| /** |
| * Ellipsize just the last line of text in this view and set the text to the |
| * new ellipsized value. |
| * @param text Text to set and ellipsize |
| * @param avail available width in pixels for the last line |
| * @param paint Paint that has the proper properties set to measure the text |
| * for this view |
| * @return the {@link CharSequence} that was set on the {@link TextView} |
| */ |
| public CharSequence setText(final CharSequence text, int avail) { |
| if (text == null || text.length() == 0) { |
| return text; |
| } |
| |
| setEllipsize(null); |
| setText(text); |
| |
| if (avail == ALL_AVAILABLE) { |
| return text; |
| } |
| Layout layout = getLayout(); |
| |
| if (layout == null) { |
| final int w = getWidth() - getCompoundPaddingLeft() - getCompoundPaddingRight(); |
| layout = new StaticLayout(text, 0, text.length(), getPaint(), w, Alignment.ALIGN_NORMAL, |
| 1.0f, 0f, false); |
| } |
| |
| // find the last line of text and chop it according to available space |
| final int lastLineStart = layout.getLineStart(mMaxLines - 1); |
| final CharSequence remainder = TextUtils.ellipsize(text.subSequence(lastLineStart, |
| text.length()), getPaint(), avail, TextUtils.TruncateAt.END); |
| |
| // assemble just the text portion, without spans |
| final SpannableStringBuilder builder = new SpannableStringBuilder(); |
| |
| builder.append(text.toString(), 0, lastLineStart); |
| |
| if (!TextUtils.isEmpty(remainder)) { |
| builder.append(remainder.toString()); |
| } |
| |
| // Now copy the original spans into the assembled string, modified for any ellipsizing. |
| // |
| // Merely assembling the Spanned pieces together would result in duplicate CharacterStyle |
| // spans in the assembled version if a CharacterStyle spanned across the lastLineStart |
| // offset. |
| if (text instanceof Spanned) { |
| final Spanned s = (Spanned) text; |
| final Object[] spans = s.getSpans(0, s.length(), Object.class); |
| final int destLen = builder.length(); |
| for (int i = 0; i < spans.length; i++) { |
| final Object span = spans[i]; |
| final int start = s.getSpanStart(span); |
| final int end = s.getSpanEnd(span); |
| final int flags = s.getSpanFlags(span); |
| if (start <= destLen) { |
| builder.setSpan(span, start, Math.min(end, destLen), flags); |
| } |
| } |
| } |
| |
| setText(builder); |
| |
| return builder; |
| } |
| } |