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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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 android.widget;
import android.annotation.NonNull;
import android.content.ClipData;
import android.content.Context;
import android.text.Editable;
import android.text.Selection;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.util.Log;
import java.util.Collections;
import java.util.Set;
/**
* Default implementation of {@link RichContentReceiver} for editable {@link TextView} components.
* This class handles insertion of text (plain text, styled text, HTML, etc) but not images or other
* rich content. Typically this class will be used as a delegate by custom implementations of
* {@link RichContentReceiver}, to provide consistent behavior for insertion of text while
* implementing custom behavior for insertion of other content (images, etc). See
* {@link TextView#DEFAULT_RICH_CONTENT_RECEIVER}.
*
* @hide
*/
final class TextViewRichContentReceiver implements RichContentReceiver<TextView> {
static final TextViewRichContentReceiver INSTANCE = new TextViewRichContentReceiver();
private static final String LOG_TAG = "RichContentReceiver";
private static final Set<String> MIME_TYPES_ALL_TEXT = Collections.singleton("text/*");
@Override
public Set<String> getSupportedMimeTypes() {
return MIME_TYPES_ALL_TEXT;
}
@Override
public boolean onReceive(@NonNull TextView textView, @NonNull ClipData clip,
@Source int source, @Flags int flags) {
if (Log.isLoggable(LOG_TAG, Log.DEBUG)) {
StringBuilder sb = new StringBuilder("onReceive: clip=");
if (clip.getDescription() == null) {
sb.append("null");
} else {
clip.getDescription().toShortStringTypesOnly(sb);
}
sb.append(", source=").append(RichContentReceiver.sourceToString(source));
sb.append(", flags=").append(RichContentReceiver.flagsToString(flags));
Log.d(LOG_TAG, sb.toString());
}
if (source == SOURCE_AUTOFILL) {
return onReceiveForAutofill(textView, clip, flags);
}
if (source == SOURCE_DRAG_AND_DROP) {
return onReceiveForDragAndDrop(textView, clip, flags);
}
if (source == SOURCE_INPUT_METHOD && !supports(clip.getDescription())) {
return false;
}
// The code here follows the original paste logic from TextView:
// https://cs.android.com/android/_/android/platform/frameworks/base/+/9fefb65aa9e7beae9ca8306b925b9fbfaeffecc9:core/java/android/widget/TextView.java;l=12644
// In particular, multiple items within the given ClipData will trigger separate calls to
// replace/insert. This is to preserve the original behavior with respect to TextWatcher
// notifications fired from SpannableStringBuilder when replace/insert is called.
final Editable editable = (Editable) textView.getText();
final Context context = textView.getContext();
boolean didFirst = false;
for (int i = 0; i < clip.getItemCount(); i++) {
CharSequence itemText;
if ((flags & FLAG_CONVERT_TO_PLAIN_TEXT) != 0) {
itemText = clip.getItemAt(i).coerceToText(context);
itemText = (itemText instanceof Spanned) ? itemText.toString() : itemText;
} else {
itemText = clip.getItemAt(i).coerceToStyledText(context);
}
if (itemText != null) {
if (!didFirst) {
replaceSelection(editable, itemText);
didFirst = true;
} else {
editable.insert(Selection.getSelectionEnd(editable), "\n");
editable.insert(Selection.getSelectionEnd(editable), itemText);
}
}
}
return didFirst;
}
private static void replaceSelection(@NonNull Editable editable,
@NonNull CharSequence replacement) {
final int selStart = Selection.getSelectionStart(editable);
final int selEnd = Selection.getSelectionEnd(editable);
final int start = Math.max(0, Math.min(selStart, selEnd));
final int end = Math.max(0, Math.max(selStart, selEnd));
Selection.setSelection(editable, end);
editable.replace(start, end, replacement);
}
private static boolean onReceiveForAutofill(@NonNull TextView textView, @NonNull ClipData clip,
@Flags int flags) {
final CharSequence text = coerceToText(clip, textView.getContext(), flags);
// First autofill it...
textView.setText(text);
// ...then move cursor to the end.
final Editable editable = (Editable) textView.getText();
Selection.setSelection(editable, editable.length());
return true;
}
private static boolean onReceiveForDragAndDrop(@NonNull TextView textView,
@NonNull ClipData clip, @Flags int flags) {
final CharSequence text = coerceToText(clip, textView.getContext(), flags);
if (text.length() == 0) {
return false;
}
replaceSelection((Editable) textView.getText(), text);
return true;
}
private static CharSequence coerceToText(ClipData clip, Context context, @Flags int flags) {
SpannableStringBuilder ssb = new SpannableStringBuilder();
for (int i = 0; i < clip.getItemCount(); i++) {
CharSequence itemText;
if ((flags & FLAG_CONVERT_TO_PLAIN_TEXT) != 0) {
itemText = clip.getItemAt(i).coerceToText(context);
itemText = (itemText instanceof Spanned) ? itemText.toString() : itemText;
} else {
itemText = clip.getItemAt(i).coerceToStyledText(context);
}
if (itemText != null) {
ssb.append(itemText);
}
}
return ssb;
}
}
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