/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.widget;
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import android.database.DataSetObserver;
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import android.view.View;
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import android.view.ViewGroup;
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/**
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* An adapter that links a {@link ExpandableListView} with the underlying
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* data. The implementation of this interface will provide access
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* to the data of the children (categorized by groups), and also instantiate
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* {@link View}s for children and groups.
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*/
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public interface ExpandableListAdapter {
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/**
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* @see Adapter#registerDataSetObserver(DataSetObserver)
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*/
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void registerDataSetObserver(DataSetObserver observer);
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/**
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* @see Adapter#unregisterDataSetObserver(DataSetObserver)
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*/
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void unregisterDataSetObserver(DataSetObserver observer);
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/**
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* Gets the number of groups.
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*
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* @return the number of groups
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*/
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int getGroupCount();
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/**
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* Gets the number of children in a specified group.
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*
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* @param groupPosition the position of the group for which the children
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* count should be returned
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* @return the children count in the specified group
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*/
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int getChildrenCount(int groupPosition);
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/**
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* Gets the data associated with the given group.
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*
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* @param groupPosition the position of the group
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* @return the data child for the specified group
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*/
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Object getGroup(int groupPosition);
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/**
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* Gets the data associated with the given child within the given group.
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*
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* @param groupPosition the position of the group that the child resides in
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* @param childPosition the position of the child with respect to other
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* children in the group
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* @return the data of the child
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*/
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Object getChild(int groupPosition, int childPosition);
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/**
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* Gets the ID for the group at the given position. This group ID must be
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* unique across groups. The combined ID (see
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* {@link #getCombinedGroupId(long)}) must be unique across ALL items
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* (groups and all children).
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*
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* @param groupPosition the position of the group for which the ID is wanted
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* @return the ID associated with the group
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*/
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long getGroupId(int groupPosition);
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/**
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* Gets the ID for the given child within the given group. This ID must be
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* unique across all children within the group. The combined ID (see
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* {@link #getCombinedChildId(long, long)}) must be unique across ALL items
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* (groups and all children).
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*
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* @param groupPosition the position of the group that contains the child
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* @param childPosition the position of the child within the group for which
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* the ID is wanted
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* @return the ID associated with the child
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*/
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long getChildId(int groupPosition, int childPosition);
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/**
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* Indicates whether the child and group IDs are stable across changes to the
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* underlying data.
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*
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* @return whether or not the same ID always refers to the same object
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* @see Adapter#hasStableIds()
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*/
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boolean hasStableIds();
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/**
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* Gets a View that displays the given group. This View is only for the
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* group--the Views for the group's children will be fetched using
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* {@link #getChildView(int, int, boolean, View, ViewGroup)}.
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*
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* @param groupPosition the position of the group for which the View is
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* returned
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* @param isExpanded whether the group is expanded or collapsed
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* @param convertView the old view to reuse, if possible. You should check
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* that this view is non-null and of an appropriate type before
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* using. If it is not possible to convert this view to display
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* the correct data, this method can create a new view. It is not
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* guaranteed that the convertView will have been previously
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* created by
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* {@link #getGroupView(int, boolean, View, ViewGroup)}.
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* @param parent the parent that this view will eventually be attached to
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* @return the View corresponding to the group at the specified position
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*/
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View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent);
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/**
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* Gets a View that displays the data for the given child within the given
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* group.
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*
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* @param groupPosition the position of the group that contains the child
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* @param childPosition the position of the child (for which the View is
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* returned) within the group
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* @param isLastChild Whether the child is the last child within the group
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* @param convertView the old view to reuse, if possible. You should check
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* that this view is non-null and of an appropriate type before
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* using. If it is not possible to convert this view to display
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* the correct data, this method can create a new view. It is not
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* guaranteed that the convertView will have been previously
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* created by
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* {@link #getChildView(int, int, boolean, View, ViewGroup)}.
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* @param parent the parent that this view will eventually be attached to
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* @return the View corresponding to the child at the specified position
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*/
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View getChildView(int groupPosition, int childPosition, boolean isLastChild,
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View convertView, ViewGroup parent);
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/**
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* Whether the child at the specified position is selectable.
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*
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* @param groupPosition the position of the group that contains the child
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* @param childPosition the position of the child within the group
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* @return whether the child is selectable.
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*/
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boolean isChildSelectable(int groupPosition, int childPosition);
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/**
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* @see ListAdapter#areAllItemsEnabled()
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*/
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boolean areAllItemsEnabled();
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/**
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* @see ListAdapter#isEmpty()
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*/
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boolean isEmpty();
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/**
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* Called when a group is expanded.
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*
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* @param groupPosition The group being expanded.
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*/
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void onGroupExpanded(int groupPosition);
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/**
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* Called when a group is collapsed.
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*
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* @param groupPosition The group being collapsed.
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*/
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void onGroupCollapsed(int groupPosition);
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/**
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* Gets an ID for a child that is unique across any item (either group or
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* child) that is in this list. Expandable lists require each item (group or
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* child) to have a unique ID among all children and groups in the list.
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* This method is responsible for returning that unique ID given a child's
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* ID and its group's ID. Furthermore, if {@link #hasStableIds()} is true, the
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* returned ID must be stable as well.
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*
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* @param groupId The ID of the group that contains this child.
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* @param childId The ID of the child.
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* @return The unique (and possibly stable) ID of the child across all
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* groups and children in this list.
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*/
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long getCombinedChildId(long groupId, long childId);
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/**
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* Gets an ID for a group that is unique across any item (either group or
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* child) that is in this list. Expandable lists require each item (group or
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* child) to have a unique ID among all children and groups in the list.
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* This method is responsible for returning that unique ID given a group's
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* ID. Furthermore, if {@link #hasStableIds()} is true, the returned ID must be
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* stable as well.
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*
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* @param groupId The ID of the group
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* @return The unique (and possibly stable) ID of the group across all
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* groups and children in this list.
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*/
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long getCombinedGroupId(long groupId);
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}
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