| /* |
| * Copyright (C) 2011 Google Inc. |
| * Licensed to 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 com.android.mailcommon; |
| |
| import com.android.mailcommon.MergedAdapter.ListSpinnerAdapter; |
| import com.android.mailcommon.MergedAdapter.LocalAdapterPosition; |
| |
| import android.content.Context; |
| import android.graphics.Rect; |
| import android.graphics.drawable.Drawable; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.AdapterView; |
| import android.widget.FrameLayout; |
| import android.widget.ListPopupWindow; |
| import android.widget.ListView; |
| |
| |
| /** |
| * <p>A spinner-like widget that combines data and views from multiple adapters (via MergedAdapter) |
| * and forwards certain events to those adapters. This widget also supports clickable but |
| * unselectable dropdown items, useful when displaying extra items that should not affect spinner |
| * selection state.</p> |
| * |
| * <p>The framework's Spinner widget can't be extended for this task because it uses a private list |
| * adapter (which prevents setting multiple item types) and hides access to its popup, which is |
| * useful for clients to know about (like when it's been opened).</p> |
| * |
| * <p>Clients must provide a set of adapters which the widget will use to load dropdown views, |
| * receive callbacks, and load the selected item's view.</p> |
| * |
| * <p>Apps incorporating this widget must declare a custom attribute: "dropDownWidth" under the |
| * "MultiAdapterSpinner" name as a "reference" format (see Gmail's attrs.xml file for an |
| * example). This attribute controls the width of the dropdown, similar to the attribute in the |
| * framework's Spinner widget.</p> |
| * |
| */ |
| public class MultiAdapterSpinner extends FrameLayout |
| implements AdapterView.OnItemClickListener, View.OnClickListener { |
| |
| protected MergedAdapter<FancySpinnerAdapter> mAdapter; |
| protected ListPopupWindow mPopup; |
| |
| private int mSelectedPosition = -1; |
| private Rect mTempRect = new Rect(); |
| |
| /** |
| * A basic adapter with some callbacks added so clients can be involved in spinner behavior. |
| */ |
| public interface FancySpinnerAdapter extends ListSpinnerAdapter { |
| /** |
| * Whether or not an item at position should become the new selected spinner item and change |
| * the spinner item view. |
| */ |
| boolean canSelect(int position); |
| /** |
| * Handle a click on an enabled item. |
| */ |
| void onClick(int position); |
| /** |
| * Fired when the popup window is about to be displayed. |
| */ |
| void onShowPopup(); |
| } |
| |
| private static class MergedSpinnerAdapter extends MergedAdapter<FancySpinnerAdapter> { |
| /** |
| * ListPopupWindow uses getView() but spinners return dropdown views in getDropDownView(). |
| */ |
| @Override |
| public View getView(int position, View convertView, ViewGroup parent) { |
| return super.getDropDownView(position, convertView, parent); |
| } |
| } |
| |
| public MultiAdapterSpinner(Context context) { |
| this(context, null); |
| } |
| |
| public MultiAdapterSpinner(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| |
| mAdapter = new MergedSpinnerAdapter(); |
| mPopup = new ListPopupWindow(context, attrs); |
| mPopup.setAnchorView(this); |
| mPopup.setOnItemClickListener(this); |
| mPopup.setModal(true); |
| mPopup.setAdapter(mAdapter); |
| } |
| |
| public void setAdapters(FancySpinnerAdapter... adapters) { |
| mAdapter.setAdapters(adapters); |
| } |
| |
| public void setSelectedItem(final FancySpinnerAdapter adapter, final int position) { |
| int globalPosition = 0; |
| boolean found = false; |
| |
| for (int i = 0, count = mAdapter.getSubAdapterCount(); i < count; i++) { |
| ListSpinnerAdapter a = mAdapter.getSubAdapter(i); |
| if (a == adapter) { |
| globalPosition += position; |
| found = true; |
| break; |
| } |
| globalPosition += a.getCount(); |
| } |
| if (found) { |
| if (adapter.canSelect(position)) { |
| removeAllViews(); |
| View itemView = adapter.getView(position, null, this); |
| itemView.setClickable(true); |
| itemView.setOnClickListener(this); |
| addView(itemView); |
| |
| if (position < adapter.getCount()) { |
| mSelectedPosition = globalPosition; |
| } |
| } |
| } |
| } |
| |
| @Override |
| public void onClick(View v) { |
| if (!mPopup.isShowing()) { |
| |
| for (int i = 0, count = mAdapter.getSubAdapterCount(); i < count; i++) { |
| mAdapter.getSubAdapter(i).onShowPopup(); |
| } |
| |
| final int spinnerPaddingLeft = getPaddingLeft(); |
| final Drawable background = mPopup.getBackground(); |
| int bgOffset = 0; |
| if (background != null) { |
| background.getPadding(mTempRect); |
| bgOffset = -mTempRect.left; |
| } |
| mPopup.setHorizontalOffset(bgOffset + spinnerPaddingLeft); |
| mPopup.show(); |
| mPopup.getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE); |
| mPopup.setSelection(mSelectedPosition); |
| } |
| } |
| |
| @Override |
| public void onItemClick(AdapterView<?> parent, View view, int position, long id) { |
| |
| if (position != mSelectedPosition) { |
| final LocalAdapterPosition<FancySpinnerAdapter> result = |
| mAdapter.getAdapterOffsetForItem(position); |
| |
| if (result.mAdapter.canSelect(result.mLocalPosition)) { |
| mSelectedPosition = position; |
| } else { |
| mPopup.clearListSelection(); |
| } |
| |
| post(new Runnable() { |
| @Override |
| public void run() { |
| result.mAdapter.onClick(result.mLocalPosition); |
| } |
| }); |
| } |
| |
| mPopup.dismiss(); |
| } |
| |
| } |