diff options
Diffstat (limited to 'libraries/HtmlTextView/src')
4 files changed, 515 insertions, 0 deletions
diff --git a/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/HtmlTagHandler.java b/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/HtmlTagHandler.java new file mode 100644 index 000000000..c40c8dec3 --- /dev/null +++ b/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/HtmlTagHandler.java @@ -0,0 +1,92 @@ +/* + * Copyright (C) 2013 Mohammed Lakkadshaw + * + * 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.Vector; + +import org.xml.sax.XMLReader; + +import android.text.Editable; +import android.text.Html; +import android.text.Spannable; +import android.text.style.BulletSpan; +import android.text.style.LeadingMarginSpan; +import android.text.style.TypefaceSpan; +import android.util.Log; + +public class HtmlTagHandler implements Html.TagHandler { + private int mListItemCount = 0; + private Vector<String> mListParents = new Vector<String>(); + + @Override + public void handleTag(final boolean opening, final String tag, Editable output, final XMLReader xmlReader) { + + if (tag.equals("ul") || tag.equals("ol") || tag.equals("dd")) { + if (opening) { + mListParents.add(tag); + } else mListParents.remove(tag); + + mListItemCount = 0; + } else if (tag.equals("li") && !opening) { + handleListTag(output); + } else if (tag.equalsIgnoreCase("code")) { + if (opening) { + output.setSpan(new TypefaceSpan("monospace"), output.length(), output.length(), Spannable.SPAN_MARK_MARK); + } else { + Log.d(HtmlTextView.TAG, "Code tag encountered"); + Object obj = getLast(output, TypefaceSpan.class); + int where = output.getSpanStart(obj); + output.setSpan(new TypefaceSpan("monospace"), where, output.length(), 0); + } + } + } + + private Object getLast(Editable text, Class kind) { + Object[] objs = text.getSpans(0, text.length(), kind); + if (objs.length == 0) { + return null; + } else { + for (int i = objs.length; i > 0; i--) { + if (text.getSpanFlags(objs[i - 1]) == Spannable.SPAN_MARK_MARK) { + return objs[i - 1]; + } + } + return null; + } + } + + private void handleListTag(Editable output) { + if (mListParents.lastElement().equals("ul")) { + output.append("\n"); + String[] split = output.toString().split("\n"); + + int lastIndex = split.length - 1; + int start = output.length() - split[lastIndex].length() - 1; + output.setSpan(new BulletSpan(15 * mListParents.size()), start, output.length(), 0); + } else if (mListParents.lastElement().equals("ol")) { + mListItemCount++; + + output.append("\n"); + String[] split = output.toString().split("\n"); + + int lastIndex = split.length - 1; + int start = output.length() - split[lastIndex].length() - 1; + output.insert(start, mListItemCount + ". "); + output.setSpan(new LeadingMarginSpan.Standard(15 * mListParents.size()), start, output.length(), 0); + } + } +} diff --git a/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/HtmlTextView.java b/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/HtmlTextView.java new file mode 100644 index 000000000..317c25aaf --- /dev/null +++ b/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/HtmlTextView.java @@ -0,0 +1,83 @@ +/* + * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de> + * + * 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 android.content.Context; +import android.text.Html; +import android.text.method.LinkMovementMethod; +import android.util.AttributeSet; + +import java.io.InputStream; + +public class HtmlTextView extends JellyBeanSpanFixTextView { + + public static final String TAG = "HtmlTextView"; + + public HtmlTextView(Context context, AttributeSet attrs, int defStyle) { + super(context, attrs, defStyle); + } + + public HtmlTextView(Context context, AttributeSet attrs) { + super(context, attrs); + } + + public HtmlTextView(Context context) { + super(context); + } + + /** + * http://stackoverflow.com/questions/309424/read-convert-an-inputstream-to-a-string + * + * @param is + * @return + */ + static private String convertStreamToString(java.io.InputStream is) { + java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A"); + return s.hasNext() ? s.next() : ""; + } + + /** + * Loads HTML from a raw resource, i.e., a HTML file in res/raw/. + * This allows translatable resource (e.g., res/raw-de/ for german). + * The containing HTML is parsed to Android's Spannable format and then displayed. + * + * @param context + * @param id for example: R.raw.help + */ + public void setHtmlFromRawResource(Context context, int id) { + // load html from html file from /res/raw + InputStream inputStreamText = context.getResources().openRawResource(id); + + setHtmlFromString(convertStreamToString(inputStreamText)); + } + + /** + * Parses String containing HTML to Android's Spannable format and displays it in this TextView. + * + * @param html String containing HTML, for example: "<b>Hello world!</b>" + */ + public void setHtmlFromString(String html) { + // this uses Android's Html class for basic parsing, and HtmlTagHandler + setText(Html.fromHtml(html, new UrlImageGetter(this, getContext()), new HtmlTagHandler())); + + // make links work + setMovementMethod(LinkMovementMethod.getInstance()); + + // no flickering when clicking textview for Android < 4 +// text.setTextColor(getResources().getColor(android.R.color.secondary_text_dark_nodisable)); + } +} diff --git a/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/JellyBeanSpanFixTextView.java b/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/JellyBeanSpanFixTextView.java new file mode 100644 index 000000000..94bf45849 --- /dev/null +++ b/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/JellyBeanSpanFixTextView.java @@ -0,0 +1,212 @@ +/* + * 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); + } + +}
\ No newline at end of file diff --git a/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/UrlImageGetter.java b/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/UrlImageGetter.java new file mode 100644 index 000000000..e4fc41c05 --- /dev/null +++ b/libraries/HtmlTextView/src/org/sufficientlysecure/htmltextview/UrlImageGetter.java @@ -0,0 +1,128 @@ +/* + * Copyright (C) 2013 Antarix Tandon + * + * 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 android.content.Context; +import android.graphics.Canvas; +import android.graphics.drawable.BitmapDrawable; +import android.graphics.drawable.Drawable; +import android.os.AsyncTask; +import android.text.Html.ImageGetter; +import android.view.View; + +import org.apache.http.HttpResponse; +import org.apache.http.client.methods.HttpGet; +import org.apache.http.impl.client.DefaultHttpClient; + +import java.io.IOException; +import java.io.InputStream; +import java.net.MalformedURLException; + +public class UrlImageGetter implements ImageGetter { + Context c; + View container; + + /** + * Construct the URLImageParser which will execute AsyncTask and refresh the container + * + * @param t + * @param c + */ + public UrlImageGetter(View t, Context c) { + this.c = c; + this.container = t; + } + + public Drawable getDrawable(String source) { + UrlDrawable urlDrawable = new UrlDrawable(); + + // get the actual source + ImageGetterAsyncTask asyncTask = new ImageGetterAsyncTask(urlDrawable); + + asyncTask.execute(source); + + // return reference to URLDrawable where I will change with actual image from + // the src tag + return urlDrawable; + } + + public class ImageGetterAsyncTask extends AsyncTask<String, Void, Drawable> { + UrlDrawable urlDrawable; + + public ImageGetterAsyncTask(UrlDrawable d) { + this.urlDrawable = d; + } + + @Override + protected Drawable doInBackground(String... params) { + String source = params[0]; + return fetchDrawable(source); + } + + @Override + protected void onPostExecute(Drawable result) { + // set the correct bound according to the result from HTTP call + urlDrawable.setBounds(0, 0, 0 + result.getIntrinsicWidth(), 0 + result.getIntrinsicHeight()); + + // change the reference of the current drawable to the result + // from the HTTP call + urlDrawable.drawable = result; + + // redraw the image by invalidating the container + UrlImageGetter.this.container.invalidate(); + } + + /** + * Get the Drawable from URL + * + * @param urlString + * @return + */ + public Drawable fetchDrawable(String urlString) { + try { + InputStream is = fetch(urlString); + Drawable drawable = Drawable.createFromStream(is, "src"); + drawable.setBounds(0, 0, 0 + drawable.getIntrinsicWidth(), 0 + drawable.getIntrinsicHeight()); + return drawable; + } catch (Exception e) { + return null; + } + } + + private InputStream fetch(String urlString) throws MalformedURLException, IOException { + DefaultHttpClient httpClient = new DefaultHttpClient(); + HttpGet request = new HttpGet(urlString); + HttpResponse response = httpClient.execute(request); + return response.getEntity().getContent(); + } + } + + @SuppressWarnings("deprecation") + public class UrlDrawable extends BitmapDrawable { + // the drawable that you need to set, you could set the initial drawing + // with the loading image if you need to + protected Drawable drawable; + + @Override + public void draw(Canvas canvas) { + // override the draw to facilitate refresh function later + if (drawable != null) { + drawable.draw(canvas); + } + } + } +} |