AppCompatEditor.java
/*
* Copyright 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 androidx.appcompat.widget;
import static androidx.core.view.ContentInfoCompat.SOURCE_DRAG_AND_DROP;
import android.app.Activity;
import android.content.ClipData;
import android.content.Context;
import android.content.ContextWrapper;
import android.os.Build;
import android.text.Selection;
import android.text.Spannable;
import android.util.Log;
import android.view.DragEvent;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.core.view.ContentInfoCompat;
import androidx.core.view.ViewCompat;
class AppCompatEditor {
private static final String LOG_TAG = "AppCompatEditor";
@NonNull
private final TextView mTextView;
AppCompatEditor(@NonNull TextView textView) {
mTextView = textView;
}
public boolean onDragEvent(@NonNull DragEvent event) {
if (Build.VERSION.SDK_INT < 24
|| event.getAction() != DragEvent.ACTION_DROP
|| event.getLocalState() != null
|| ViewCompat.getOnReceiveContentMimeTypes(mTextView) == null) {
return false;
}
// We make a best effort to find the activity for this view by unwrapping the
// context (common case). If we are not able to find it, we skip calling the
// OnReceiveContentListener and delegate to the default behavior. Apps can always implement
// custom drop handling by overriding onDragEvent() or setting an OnDragListener.
final Activity activity = getActivity();
if (activity == null) {
Log.i(LOG_TAG, "No activity so not calling performReceiveContent: " + mTextView);
return false;
}
return Api24Impl.onDrop(event, mTextView, activity);
}
@Nullable
private Activity getActivity() {
Context context = mTextView.getContext();
while (context instanceof ContextWrapper) {
if (context instanceof Activity) {
return (Activity) context;
}
context = ((ContextWrapper) context).getBaseContext();
}
return null;
}
@RequiresApi(24) // For Activity.requestDragAndDropPermissions()
private static final class Api24Impl {
private Api24Impl() {}
static boolean onDrop(@NonNull DragEvent event,
@NonNull TextView textView, @NonNull Activity activity) {
final int offset = textView.getOffsetForPosition(event.getX(), event.getY());
activity.requestDragAndDropPermissions(event);
textView.beginBatchEdit();
try {
Selection.setSelection((Spannable) textView.getText(), offset);
final ClipData clip = event.getClipData();
final ContentInfoCompat payload =
new ContentInfoCompat.Builder(clip, SOURCE_DRAG_AND_DROP).build();
ViewCompat.performReceiveContent(textView, payload);
} finally {
textView.endBatchEdit();
}
return true;
}
}
}