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/*
* Copyright 2017 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.recyclerview.selection;
import static android.support.v4.util.Preconditions.checkArgument;
import static android.support.v4.util.Preconditions.checkState;
import android.support.annotation.Nullable;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import androidx.recyclerview.selection.ItemDetailsLookup.ItemDetails;
/**
* Base class for handlers that can be registered w/ {@link GestureRouter}.
*/
abstract class MotionInputHandler<K> extends SimpleOnGestureListener {
protected final SelectionHelper<K> mSelectionHelper;
private final ItemKeyProvider<K> mKeyProvider;
private final FocusCallbacks<K> mFocusCallbacks;
MotionInputHandler(
SelectionHelper<K> selectionHelper,
ItemKeyProvider<K> keyProvider,
FocusCallbacks<K> focusCallbacks) {
checkArgument(selectionHelper != null);
checkArgument(keyProvider != null);
checkArgument(focusCallbacks != null);
mSelectionHelper = selectionHelper;
mKeyProvider = keyProvider;
mFocusCallbacks = focusCallbacks;
}
final boolean selectItem(ItemDetails<K> details) {
checkArgument(details != null);
checkArgument(hasPosition(details));
checkArgument(hasSelectionKey(details));
if (mSelectionHelper.select(details.getSelectionKey())) {
mSelectionHelper.anchorRange(details.getPosition());
}
// we set the focus on this doc so it will be the origin for keyboard events or shift+clicks
// if there is only a single item selected, otherwise clear focus
if (mSelectionHelper.getSelection().size() == 1) {
mFocusCallbacks.focusItem(details);
} else {
mFocusCallbacks.clearFocus();
}
return true;
}
protected final boolean focusItem(ItemDetails<K> details) {
checkArgument(details != null);
checkArgument(hasSelectionKey(details));
mSelectionHelper.clearSelection();
mFocusCallbacks.focusItem(details);
return true;
}
protected final void extendSelectionRange(ItemDetails<K> details) {
checkState(mKeyProvider.hasAccess(ItemKeyProvider.SCOPE_MAPPED));
checkArgument(hasPosition(details));
checkArgument(hasSelectionKey(details));
mSelectionHelper.extendRange(details.getPosition());
mFocusCallbacks.focusItem(details);
}
final boolean isRangeExtension(MotionEvent e) {
return MotionEvents.isShiftKeyPressed(e)
&& mSelectionHelper.isRangeActive()
// Without full corpus access we can't reliably implement range
// as a user can scroll *anywhere* then SHIFT+click.
&& mKeyProvider.hasAccess(ItemKeyProvider.SCOPE_MAPPED);
}
boolean shouldClearSelection(MotionEvent e, ItemDetails<K> item) {
return !MotionEvents.isCtrlKeyPressed(e)
&& !item.inSelectionHotspot(e)
&& !mSelectionHelper.isSelected(item.getSelectionKey());
}
static boolean hasSelectionKey(@Nullable ItemDetails<?> item) {
return item != null && item.getSelectionKey() != null;
}
static boolean hasPosition(@Nullable ItemDetails<?> item) {
return item != null && item.getPosition() != RecyclerView.NO_POSITION;
}
}
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