Asd Code 1
final TextViewUndoRedo helper = new TextViewUndoRedo(_edittext);
Asd Code 2
_undo.setOnClickListener (new View.OnClickListener() { @Override public void onClick(View v) { helper.undo(); } });
Asd Code 3
_redo.setOnClickListener (new View.OnClickListener() { @Override public void onClick(View v) { helper.redo(); } });
Asd Code 4
}
Asd Code 5
public class TextViewUndoRedo { private boolean mIsUndoOrRedo = false; private EditHistory mEditHistory; private EditTextChangeListener mChangeListener; private TextView mTextView; public TextViewUndoRedo(TextView textView) { mTextView = textView; mEditHistory = new EditHistory(); mChangeListener = new EditTextChangeListener(); mTextView.addTextChangedListener(mChangeListener); } public void disconnect() { mTextView.removeTextChangedListener(mChangeListener); } public void setMaxHistorySize(int maxHistorySize) { mEditHistory.setMaxHistorySize(maxHistorySize); } public void clearHistory() { mEditHistory.clear(); } public boolean getCanUndo() { return (mEditHistory.mmPosition > 0); } public void undo() { EditItem edit = mEditHistory.getPrevious(); if (edit == null) { return; } Editable text = mTextView.getEditableText(); int start = edit.mmStart; int end = start + (edit.mmAfter != null ? edit.mmAfter.length() : 0); mIsUndoOrRedo = true; text.replace(start, end, edit.mmBefore); mIsUndoOrRedo = false; for (Object o : text.getSpans(0, text.length(), android.text.style.UnderlineSpan.class)) { text.removeSpan(o); } Selection.setSelection(text, edit.mmBefore == null ? start : (start + edit.mmBefore.length())); } public boolean getCanRedo() { return (mEditHistory.mmPosition < mEditHistory.mmHistory.size()); } public void redo() { EditItem edit = mEditHistory.getNext(); if (edit == null) { return; } Editable text = mTextView.getEditableText(); int start = edit.mmStart; int end = start + (edit.mmBefore != null ? edit.mmBefore.length() : 0); mIsUndoOrRedo = true; text.replace(start, end, edit.mmAfter); mIsUndoOrRedo = false; for (Object o : text.getSpans(0, text.length(), android.text.style.UnderlineSpan.class)) { text.removeSpan(o); } Selection.setSelection(text, edit.mmAfter == null ? start : (start + edit.mmAfter.length())); } public void storePersistentState(android.content.SharedPreferences.Editor editor, String prefix) { editor.putString(prefix + ".hash", String.valueOf(mTextView.getText().toString().hashCode())); editor.putInt(prefix + ".maxSize", mEditHistory.mmMaxHistorySize); editor.putInt(prefix + ".position", mEditHistory.mmPosition); editor.putInt(prefix + ".size", mEditHistory.mmHistory.size()); int i = 0; for (EditItem ei : mEditHistory.mmHistory) { String pre = prefix + "." + i; editor.putInt(pre + ".start", ei.mmStart); editor.putString(pre + ".before", ei.mmBefore.toString()); editor.putString(pre + ".after", ei.mmAfter.toString()); i++; } } public boolean restorePersistentState(SharedPreferences sp, String prefix) throws IllegalStateException { boolean ok = doRestorePersistentState(sp, prefix); if (!ok) { mEditHistory.clear(); } return ok; } private boolean doRestorePersistentState(SharedPreferences sp, String prefix) { String hash = sp.getString(prefix + ".hash", null); if (hash == null) { return true; } if (Integer.valueOf(hash) != mTextView.getText().toString().hashCode()) { return false; } mEditHistory.clear(); mEditHistory.mmMaxHistorySize = sp.getInt(prefix + ".maxSize", -1); int count = sp.getInt(prefix + ".size", -1); if (count == -1) { return false; } for (int i = 0; i < count; i++) { String pre = prefix + "." + i; int start = sp.getInt(pre + ".start", -1); String before = sp.getString(pre + ".before", null); String after = sp.getString(pre + ".after", null); if (start == -1 || before == null || after == null) { return false; } mEditHistory.add(new EditItem(start, before, after)); } mEditHistory.mmPosition = sp.getInt(prefix + ".position", -1); if (mEditHistory.mmPosition == -1) { return false; } return true; } private final class EditHistory { private int mmPosition = 0; private int mmMaxHistorySize = -1; private final LinkedList mmHistory = new LinkedList(); private void clear() { mmPosition = 0; mmHistory.clear(); } private void add(EditItem item) { while (mmHistory.size() > mmPosition) { mmHistory.removeLast(); } mmHistory.add(item); mmPosition++; if (mmMaxHistorySize >= 0) { trimHistory(); } } private void setMaxHistorySize(int maxHistorySize) { mmMaxHistorySize = maxHistorySize; if (mmMaxHistorySize >= 0) { trimHistory(); } } private void trimHistory() { while (mmHistory.size() > mmMaxHistorySize) { mmHistory.removeFirst(); mmPosition--; } if (mmPosition < 0) { mmPosition = 0; } } private EditItem getPrevious() { if (mmPosition == 0) { return null; } mmPosition--; return mmHistory.get(mmPosition); } private EditItem getNext() { if (mmPosition >= mmHistory.size()) { return null; } EditItem item = mmHistory.get(mmPosition); mmPosition++; return item; } } private final class EditItem { private final int mmStart; private final CharSequence mmBefore; private final CharSequence mmAfter; public EditItem(int start, CharSequence before, CharSequence after) { mmStart = start; mmBefore = before; mmAfter = after; } } private final class EditTextChangeListener implements TextWatcher { private CharSequence mBeforeChange; private CharSequence mAfterChange; public void beforeTextChanged(CharSequence s, int start, int count, int after) { if (mIsUndoOrRedo) { return; } mBeforeChange = s.subSequence(start, start + count); } public void onTextChanged(CharSequence s, int start, int before, int count) { if (mIsUndoOrRedo) { return; } mAfterChange = s.subSequence(start, start + count); mEditHistory.add(new EditItem(start, mBeforeChange, mAfterChange)); } public void afterTextChanged(Editable s) { } } }
Asd Code 6
{
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