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Diffstat (limited to 'libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/JellyBeanSpanFixTextView.java')
| -rw-r--r-- | libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/JellyBeanSpanFixTextView.java | 212 |
1 files changed, 0 insertions, 212 deletions
diff --git a/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/JellyBeanSpanFixTextView.java b/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/JellyBeanSpanFixTextView.java deleted file mode 100644 index 94bf45849..000000000 --- a/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/JellyBeanSpanFixTextView.java +++ /dev/null @@ -1,212 +0,0 @@ -/* - * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de> - * Copyright (C) 2012 Pierre-Yves Ricau <py.ricau@gmail.com> - * - * 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 org.sufficientlysecure.htmltextview; - -import java.util.ArrayList; -import java.util.List; - -import android.content.Context; -import android.text.SpannableStringBuilder; -import android.text.Spanned; -import android.util.AttributeSet; -import android.util.Log; -import android.widget.TextView; - -/** - * <p> - * A {@link android.widget.TextView} that insert spaces around its text spans where needed to prevent - * {@link IndexOutOfBoundsException} in {@link #onMeasure(int, int)} on Jelly Bean. - * <p> - * When {@link #onMeasure(int, int)} throws an exception, we try to fix the text by adding spaces - * around spans, until it works again. We then try removing some of the added spans, to minimize the - * insertions. - * <p> - * The fix is time consuming (a few ms, it depends on the size of your text), but it should only - * happen once per text change. - * <p> - * See http://code.google.com/p/android/issues/detail?id=35466 - * - */ -public class JellyBeanSpanFixTextView extends TextView { - - private static class FixingResult { - public final boolean fixed; - public final List<Object> spansWithSpacesBefore; - public final List<Object> spansWithSpacesAfter; - - public static FixingResult fixed(List<Object> spansWithSpacesBefore, - List<Object> spansWithSpacesAfter) { - return new FixingResult(true, spansWithSpacesBefore, spansWithSpacesAfter); - } - - public static FixingResult notFixed() { - return new FixingResult(false, null, null); - } - - private FixingResult(boolean fixed, List<Object> spansWithSpacesBefore, - List<Object> spansWithSpacesAfter) { - this.fixed = fixed; - this.spansWithSpacesBefore = spansWithSpacesBefore; - this.spansWithSpacesAfter = spansWithSpacesAfter; - } - } - - public JellyBeanSpanFixTextView(Context context, AttributeSet attrs, int defStyle) { - super(context, attrs, defStyle); - } - - public JellyBeanSpanFixTextView(Context context, AttributeSet attrs) { - super(context, attrs); - } - - public JellyBeanSpanFixTextView(Context context) { - super(context); - } - - @Override - protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { - try { - super.onMeasure(widthMeasureSpec, heightMeasureSpec); - } catch (IndexOutOfBoundsException e) { - fixOnMeasure(widthMeasureSpec, heightMeasureSpec); - } - } - - /** - * If possible, fixes the Spanned text by adding spaces around spans when needed. - */ - private void fixOnMeasure(int widthMeasureSpec, int heightMeasureSpec) { - CharSequence text = getText(); - if (text instanceof Spanned) { - SpannableStringBuilder builder = new SpannableStringBuilder(text); - fixSpannedWithSpaces(builder, widthMeasureSpec, heightMeasureSpec); - } else { - if (BuildConfig.DEBUG) { - Log.d(HtmlTextView.TAG, "The text isn't a Spanned"); - } - fallbackToString(widthMeasureSpec, heightMeasureSpec); - } - } - - /** - * Add spaces around spans until the text is fixed, and then removes the unneeded spaces - */ - private void fixSpannedWithSpaces(SpannableStringBuilder builder, int widthMeasureSpec, - int heightMeasureSpec) { - long startFix = System.currentTimeMillis(); - - FixingResult result = addSpacesAroundSpansUntilFixed(builder, widthMeasureSpec, - heightMeasureSpec); - - if (result.fixed) { - removeUnneededSpaces(widthMeasureSpec, heightMeasureSpec, builder, result); - } else { - fallbackToString(widthMeasureSpec, heightMeasureSpec); - } - - if (BuildConfig.DEBUG) { - long fixDuration = System.currentTimeMillis() - startFix; - Log.d(HtmlTextView.TAG, "fixSpannedWithSpaces() duration in ms: " + fixDuration); - } - } - - private FixingResult addSpacesAroundSpansUntilFixed(SpannableStringBuilder builder, - int widthMeasureSpec, int heightMeasureSpec) { - - Object[] spans = builder.getSpans(0, builder.length(), Object.class); - List<Object> spansWithSpacesBefore = new ArrayList<Object>(spans.length); - List<Object> spansWithSpacesAfter = new ArrayList<Object>(spans.length); - - for (Object span : spans) { - int spanStart = builder.getSpanStart(span); - if (isNotSpace(builder, spanStart - 1)) { - builder.insert(spanStart, " "); - spansWithSpacesBefore.add(span); - } - - int spanEnd = builder.getSpanEnd(span); - if (isNotSpace(builder, spanEnd)) { - builder.insert(spanEnd, " "); - spansWithSpacesAfter.add(span); - } - - try { - setTextAndMeasure(builder, widthMeasureSpec, heightMeasureSpec); - return FixingResult.fixed(spansWithSpacesBefore, spansWithSpacesAfter); - } catch (IndexOutOfBoundsException notFixed) { - } - } - if (BuildConfig.DEBUG) { - Log.d(HtmlTextView.TAG, "Could not fix the Spanned by adding spaces around spans"); - } - return FixingResult.notFixed(); - } - - private boolean isNotSpace(CharSequence text, int where) { - if (where < 0) - return true; - return text.charAt(where) != ' '; - } - - private void setTextAndMeasure(CharSequence text, int widthMeasureSpec, int heightMeasureSpec) { - setText(text); - super.onMeasure(widthMeasureSpec, heightMeasureSpec); - } - - private void removeUnneededSpaces(int widthMeasureSpec, int heightMeasureSpec, - SpannableStringBuilder builder, FixingResult result) { - - for (Object span : result.spansWithSpacesAfter) { - int spanEnd = builder.getSpanEnd(span); - builder.delete(spanEnd, spanEnd + 1); - try { - setTextAndMeasure(builder, widthMeasureSpec, heightMeasureSpec); - } catch (IndexOutOfBoundsException ignored) { - builder.insert(spanEnd, " "); - } - } - - boolean needReset = true; - for (Object span : result.spansWithSpacesBefore) { - int spanStart = builder.getSpanStart(span); - builder.delete(spanStart - 1, spanStart); - try { - setTextAndMeasure(builder, widthMeasureSpec, heightMeasureSpec); - needReset = false; - } catch (IndexOutOfBoundsException ignored) { - needReset = true; - int newSpanStart = spanStart - 1; - builder.insert(newSpanStart, " "); - } - } - - if (needReset) { - setText(builder); - super.onMeasure(widthMeasureSpec, heightMeasureSpec); - } - } - - private void fallbackToString(int widthMeasureSpec, int heightMeasureSpec) { - if (BuildConfig.DEBUG) { - Log.d(HtmlTextView.TAG, "Fallback to unspanned text"); - } - String fallbackText = getText().toString(); - setTextAndMeasure(fallbackText, widthMeasureSpec, heightMeasureSpec); - } - -}
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