| /* |
| * Copyright (C) 2011 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.support.v4.view; |
| |
| import android.view.ViewConfiguration; |
| |
| /** |
| * Helper for accessing features in {@link ViewConfiguration} |
| * introduced after API level 4 in a backwards compatible fashion. |
| */ |
| public class ViewConfigurationCompat { |
| /** |
| * Interface for the full API. |
| */ |
| interface ViewConfigurationVersionImpl { |
| public int getScaledPagingTouchSlop(ViewConfiguration config); |
| public boolean hasPermanentMenuKey(ViewConfiguration config); |
| } |
| |
| /** |
| * Interface implementation that doesn't use anything about v4 APIs. |
| */ |
| static class BaseViewConfigurationVersionImpl implements ViewConfigurationVersionImpl { |
| @Override |
| public int getScaledPagingTouchSlop(ViewConfiguration config) { |
| return config.getScaledTouchSlop(); |
| } |
| |
| @Override |
| public boolean hasPermanentMenuKey(ViewConfiguration config) { |
| // Pre-HC devices will always have a menu button |
| return true; |
| } |
| } |
| |
| /** |
| * Interface implementation for devices with at least v8 APIs. |
| */ |
| static class FroyoViewConfigurationVersionImpl extends BaseViewConfigurationVersionImpl { |
| @Override |
| public int getScaledPagingTouchSlop(ViewConfiguration config) { |
| return ViewConfigurationCompatFroyo.getScaledPagingTouchSlop(config); |
| } |
| } |
| |
| /** |
| * Interface implementation for devices with at least v11 APIs. |
| */ |
| static class HoneycombViewConfigurationVersionImpl extends FroyoViewConfigurationVersionImpl { |
| @Override |
| public boolean hasPermanentMenuKey(ViewConfiguration config) { |
| // There is no way to check on Honeycomb so we assume false |
| return false; |
| } |
| } |
| |
| /** |
| * Interface implementation for devices with at least v14 APIs. |
| */ |
| static class IcsViewConfigurationVersionImpl extends HoneycombViewConfigurationVersionImpl { |
| @Override |
| public boolean hasPermanentMenuKey(ViewConfiguration config) { |
| return ViewConfigurationCompatICS.hasPermanentMenuKey(config); |
| } |
| } |
| |
| /** |
| * Select the correct implementation to use for the current platform. |
| */ |
| static final ViewConfigurationVersionImpl IMPL; |
| static { |
| if (android.os.Build.VERSION.SDK_INT >= 14) { |
| IMPL = new IcsViewConfigurationVersionImpl(); |
| } else if (android.os.Build.VERSION.SDK_INT >= 11) { |
| IMPL = new HoneycombViewConfigurationVersionImpl(); |
| } else if (android.os.Build.VERSION.SDK_INT >= 8) { |
| IMPL = new FroyoViewConfigurationVersionImpl(); |
| } else { |
| IMPL = new BaseViewConfigurationVersionImpl(); |
| } |
| } |
| |
| // ------------------------------------------------------------------- |
| |
| /** |
| * Call {@link ViewConfiguration#getScaledPagingTouchSlop()}. |
| * If running on a pre-{@link android.os.Build.VERSION_CODES#FROYO} device, |
| * returns {@link ViewConfiguration#getScaledTouchSlop()}. |
| */ |
| public static int getScaledPagingTouchSlop(ViewConfiguration config) { |
| return IMPL.getScaledPagingTouchSlop(config); |
| } |
| |
| /** |
| * Report if the device has a permanent menu key available to the user, in a backwards |
| * compatible way. |
| */ |
| public static boolean hasPermanentMenuKey(ViewConfiguration config) { |
| return IMPL.hasPermanentMenuKey(config); |
| } |
| } |