/*
* 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 com.hardsoftstudio.real.textview.views;
import android.content.Context;
import android.os.Build;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.TextView;
import com.hardsoftstudio.real.textview.utils.AutofitHelper;
import java.util.ArrayList;
import java.util.List;
public class BaseTextView extends TextView {
protected AutofitHelper mHelper;
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 BaseTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public BaseTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public BaseTextView(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 (RealTextView.DEBUG) {
Log.d("MPB", "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 (RealTextView.DEBUG) {
long fixDuration = System.currentTimeMillis() - startFix;
Log.d("MPB", "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) {
notFixed.printStackTrace();
}
}
if (RealTextView.DEBUG) {
Log.d("MPB", "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.measure(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.measure(widthMeasureSpec, heightMeasureSpec);
}
}
private void fallbackToString(int widthMeasureSpec, int heightMeasureSpec) {
if (RealTextView.DEBUG) {
Log.d("MPB", "Fallback to unspanned text");
}
String fallbackText = getText().toString();
setTextAndMeasure(fallbackText, widthMeasureSpec, heightMeasureSpec);
}
/**
* By default the autofit is enabled, it automatically disabled when using html text
* @param b true to enable, false otherwise
*/
public void setAutoFit(boolean b) {
if (mHelper!=null)
mHelper.setEnabled(b);
else
throw new NullPointerException("The autofit is not init");
}
@Override
protected void onSizeChanged (int w, int h, int oldw, int oldh){
super.onSizeChanged(w, h, oldw, oldh);
if (Build.VERSION.SDK_INT < 11){
mHelper.autofit();
}
// Otherwise the OnLayoutChangedListener will be used
}
}