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SpanAdapter.java
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SpanAdapter.java
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package com.pxh.adapter;
import android.text.Editable;
import android.text.Spanned;
import android.text.style.LeadingMarginSpan;
import android.text.style.StyleSpan;
import android.util.Log;
import com.pxh.RichEditText;
import com.pxh.richedittext.TextSpanStatus;
import java.lang.ref.WeakReference;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Objects;
/**
* Created by pxh on 2016/9/25.
*/
public abstract class SpanAdapter {
private static final String TAG = "SpanAdapter";
RichEditText editor;
private Field count;
private Field spans;
private Field ends;
public SpanAdapter(RichEditText editor) {
WeakReference<RichEditText> reference = new WeakReference<RichEditText>(editor);
this.editor = reference.get();
}
protected abstract void setSelectionText(boolean isEnable, int start, int end);
public abstract boolean changeStatusBySelectionChanged(int start, int end);
public void changeSpanBeforeTextChanged(int start, int lengthBefore, int lengthAfter) {
}
public abstract void changeSpanByTextChanged(int start, int lengthBefore, int lengthAfter);
public abstract int getSpanStatusCode();
public void enableSpan(boolean isEnable, TextSpanStatus state, int code) {
int start = editor.getSelectionStart();
int end = editor.getSelectionEnd();
if (end < start) {
start = start ^ end;
end = start ^ end;
start = start ^ end;
}
if (start < end)
setSelectionText(isEnable, start, end);
state.setTextSpanEnable(code, isEnable);
}
/**
* when characters input , set the text's span by styleSpan.
* Parameters start and lengthAfter must use the parameter of onTextChanged
*
* @param start the start of character's input
* @param lengthAfter the length of character's input
*/
protected void setTextSpanByTextChanged(int style, int start, int lengthAfter) {
if (lengthAfter == 0) {
return;
}
Object span;
if (start == 0) {
//if start = 0, text must doesn't have spans, use new StyleSpan
span = new StyleSpan(style);
setSpan(span, start, start + lengthAfter);
} else {
//estimate the character what in front of input whether have span
StyleSpan styleSpan = getStyleSpan(style, start - 1, start);
if (styleSpan == null) {
span = new StyleSpan(style);
setSpan(span, start, start + lengthAfter);
} else {
if (start < editor.getEditableText().getSpanEnd(styleSpan)) {
return;
}
//if have span , change the span's effect scope
span = styleSpan;
changeSpanEnd(styleSpan, lengthAfter, editor.getEditableText());
}
}
//merge two span
Object nextSpan = getAssignSpan(span.getClass(), start + lengthAfter, start + lengthAfter + 1);
if (nextSpan != null) {
int nextEnd = getEditableText().getSpanEnd(nextSpan);
getEditableText().removeSpan(nextSpan);
int curStart = getEditableText().getSpanStart(span);
getEditableText().removeSpan(span);
getEditableText().setSpan(span, curStart, nextEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
/**
* when characters input , set the text's span by characterStyle and ParagraphStyle.
* Parameters start and lengthAfter must use the parameter of onTextChanged
*
* @param start the start of character's input
* @param lengthAfter the length of character's input
*/
protected void setTextSpanByTextChanged(Class<?> clazz, int start, int lengthAfter) {
if (lengthAfter == 0) {
return;
}
Object span = null;
try {
if (start == 0) {
span = clazz.newInstance();
setSpan(span, start, start + lengthAfter);
} else {
Object preSpan = getAssignSpan(clazz, start - 1, start);
if (preSpan == null) {
span = clazz.newInstance();
setSpan(span, start, start + lengthAfter);
} else {
if (start < editor.getEditableText().getSpanEnd(preSpan)) {
return;
}
span = preSpan;
changeSpanEnd(preSpan, lengthAfter, editor.getEditableText());
}
}
} catch (Exception e) {
Log.e(TAG, "can not instantiated " + clazz);
e.printStackTrace();
}
//merge two span
if (span == null) return;
Object nextSpan = getAssignSpan(span.getClass(), start + lengthAfter, start + lengthAfter + 1);
if (nextSpan != span) {
int nextEnd = getEditableText().getSpanEnd(nextSpan);
if (nextEnd == -1) {
return;
}
getEditableText().removeSpan(nextSpan);
int curStart = getEditableText().getSpanStart(span);
if (curStart == -1) {
return;
}
getEditableText().removeSpan(span);
getEditableText().setSpan(span, curStart, nextEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
protected void setTextSpanByTextChanged(Object span, int start, int lengthAfter) {
if(lengthAfter == 0){
return;
}
if (start == 0) {
setSpan(span, start, start + lengthAfter);
} else {
Object preSpan = getAssignSpan(span.getClass(), start - 1, start);
if (preSpan == null) {
setSpan(span, start, start + lengthAfter);
} else {
if (start < editor.getEditableText().getSpanEnd(preSpan)) {
return;
}
span = preSpan;
changeSpanEnd(preSpan, lengthAfter, editor.getEditableText());
}
}
//merge two span
Object nextSpan = getAssignSpan(span.getClass(), start + lengthAfter, start + lengthAfter + 1);
if (nextSpan != null) {
int nextEnd = getEditableText().getSpanEnd(nextSpan);
getEditableText().removeSpan(nextSpan);
int curStart = getEditableText().getSpanStart(span);
getEditableText().removeSpan(span);
getEditableText().setSpan(span, curStart, nextEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
/**
* use reflection to change span effect scope
*
* @param span span
* @param lengthAfter the input character's increment
* @param ss use method EditText.getEditableText()
*/
protected void changeSpanEnd(Object span, int lengthAfter, Editable ss) {
if (lengthAfter == 0)
return;
try {
if (count == null) {
Class<?> classType = ss.getClass();
count = classType.getDeclaredField("mSpanCount");
spans = classType.getDeclaredField("mSpans");
ends = classType.getDeclaredField("mSpanEnds");
count.setAccessible(true);
spans.setAccessible(true);
ends.setAccessible(true);
}
int mSpanCount = (int) count.get(ss);
Object[] mSpans = (Object[]) spans.get(ss);
int[] mSpanEnds = (int[]) ends.get(ss);
for (int i = mSpanCount - 1; i >= 0; i--) {
if (mSpans[i] == span) {
mSpanEnds[i] += lengthAfter;
break;
}
}
ends.set(ss, mSpanEnds);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* estimate range whether in the span's start to end
*
* @param span the span to estimate
* @param start start of the range
* @param end end of the range
* @return if in this bound return true else return false
*/
protected boolean isRangeInSpan(Object span, int start, int end) {
return editor.getEditableText().getSpanStart(span) <= start && editor.getEditableText().getSpanEnd(span) >= end;
}
/**
* estimate span whether in the editText limit by parameters start and end
*
* @param span the span to estimate
* @param start start of the text
* @param end end of the text
* @return if in this bound return true else return false
*/
protected boolean isSpanInRange(Object span, int start, int end) {
return editor.getEditableText().getSpanStart(span) >= start && editor.getEditableText().getSpanEnd(span) <= end;
}
/**
* make the text which selected enable or disable span. if enable, it will merge same and adjacent spans
*
* @param isValid whether enable
* @param style style span
* @param start span start
* @param end span end
*/
protected void setSelectionTextSpan(boolean isValid, int style, int start, int end) {
//merge span
if (isValid) {
StyleSpan[] spans = getStyleSpans(style, start, end);
for (StyleSpan span : spans) {
if (isSpanInRange(span, start, end)) {
editor.getEditableText().removeSpan(span);
}
}
int newStart = start;
int newEnd = end;
StyleSpan before = getStyleSpan(style, start - 1, start);
if (before != null) {
newStart = editor.getEditableText().getSpanStart(before);
editor.getEditableText().removeSpan(before);
}
StyleSpan after = getStyleSpan(style, end, end + 1);
if (after != null) {
newEnd = editor.getEditableText().getSpanEnd(after);
editor.getEditableText().removeSpan(after);
}
setSpan(new StyleSpan(style), newStart, newEnd);
} else { // spilt span
StyleSpan span = getStyleSpan(style, start, end);
int spanStart = editor.getEditableText().getSpanStart(span);
int spanEnd = editor.getEditableText().getSpanEnd(span);
if (spanStart < start) {
setSpan(new StyleSpan(style), spanStart, start);
}
if (spanEnd > end) {
setSpan(new StyleSpan(style), end, spanEnd);
}
editor.getEditableText().removeSpan(span);
}
}
protected void setSelectionTextSpan(boolean isValid, Class<? extends LeadingMarginSpan> clazz, int start, int end) {
try {
LeadingMarginSpan assignSpan = clazz.newInstance();
setSelectionTextSpan(isValid, assignSpan, start, end);
} catch (Exception e) {
Log.e(TAG, "can not instantiated " + clazz);
e.printStackTrace();
}
}
protected void setSelectionTextSpan(boolean isValid, Object assignSpan, int start, int end) {
if (isValid) {
Object[] spans = getAssignSpans(assignSpan.getClass(), start, end);
for (Object span : spans) {
if (isSpanInRange(span, start, end)) {
editor.getEditableText().removeSpan(span);
}
}
int newStart = start;
int newEnd = end;
Object before = getAssignSpan(assignSpan.getClass(), start - 1, start);
if (before != null) {
newStart = editor.getEditableText().getSpanStart(before);
editor.getEditableText().removeSpan(before);
}
Object after = getAssignSpan(assignSpan.getClass(), end, end + 1);
if (after != null) {
newEnd = editor.getEditableText().getSpanEnd(after);
editor.getEditableText().removeSpan(after);
}
setSpan(assignSpan, newStart, newEnd);
} else { // spilt span
Object span = getAssignSpan(assignSpan.getClass(), start, end);
int spanStart = editor.getEditableText().getSpanStart(span);
int spanEnd = editor.getEditableText().getSpanEnd(span);
if (spanStart < start) {
setSpan(assignSpan, spanStart, start);
}
if (spanEnd > end) {
setSpan(assignSpan, end, spanEnd);
}
editor.getEditableText().removeSpan(span);
}
}
protected void removeSpan(Class<?> clazz, int start, int end) {
Object[] spans = getAssignSpans(clazz, start, end);
for (Object span : spans) {
getEditableText().removeSpan(span);
}
}
protected Editable getEditableText() {
return editor.getEditableText();
}
/**
* get styleSpan by specified style from the editable text
*
* @param style the specified style
* @param start start of editable
* @param end end of editable
* @return if there has a StyleSpan which style is specified in start to end,return it,or return null
*/
protected StyleSpan getStyleSpan(int style, int start, int end) {
StyleSpan[] spans = editor.getEditableText().getSpans(start, end, StyleSpan.class);
for (StyleSpan span : spans) {
if (span.getStyle() == style) {
return span;
}
}
return null;
}
protected StyleSpan[] getStyleSpans(int style, int start, int end) {
StyleSpan[] spans = editor.getEditableText().getSpans(start, end, StyleSpan.class);
ArrayList<StyleSpan> result = new ArrayList<>();
for (StyleSpan span : spans) {
if (span.getStyle() == style) {
result.add(span);
}
}
return result.toArray(new StyleSpan[result.size()]);
}
protected <T> T[] getAssignSpans(Class<T> clazz, int start, int end) {
return editor.getEditableText().getSpans(start, end, clazz);
}
protected <T> T getAssignSpan(Class<T> clazz, int start, int end) {
T[] spans = editor.getEditableText().getSpans(start, end, clazz);
for (T span : spans) {
if (span.getClass().equals(clazz)) {
return span;
}
}
return null;
}
protected void setSpan(Object span, int start, int end) {
editor.getEditableText().setSpan(span, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}