/*
* 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.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
import android.view.View;
import android.view.accessibility.AccessibilityEvent;
/**
* Helper for accessing newer features in View.
*/
public class ViewCompat {
/**
* Always allow a user to over-scroll this view, provided it is a
* view that can scroll.
*/
public static final int OVER_SCROLL_ALWAYS = 0;
/**
* Allow a user to over-scroll this view only if the content is large
* enough to meaningfully scroll, provided it is a view that can scroll.
*/
public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1;
/**
* Never allow a user to over-scroll this view.
*/
public static final int OVER_SCROLL_NEVER = 2;
interface ViewCompatImpl {
public boolean canScrollHorizontally(View v, int direction);
public boolean canScrollVertically(View v, int direction);
public int getOverScrollMode(View v);
public void setOverScrollMode(View v, int mode);
public void onInitializeAccessibilityEvent(View v, AccessibilityEvent event);
public void onPopulateAccessibilityEvent(View v, AccessibilityEvent event);
public void onInitializeAccessibilityNodeInfo(View v, AccessibilityNodeInfoCompat info);
public void setAccessibilityDelegate(View v, AccessibilityDelegateCompat delegate);
}
static class BaseViewCompatImpl implements ViewCompatImpl {
public boolean canScrollHorizontally(View v, int direction) {
return false;
}
public boolean canScrollVertically(View v, int direction) {
return false;
}
public int getOverScrollMode(View v) {
return OVER_SCROLL_NEVER;
}
public void setOverScrollMode(View v, int mode) {
// Do nothing; API doesn't exist
}
public void setAccessibilityDelegate(View v, AccessibilityDelegateCompat delegate) {
// Do nothing; API doesn't exist
}
public void onPopulateAccessibilityEvent(View v, AccessibilityEvent event) {
// Do nothing; API doesn't exist
}
public void onInitializeAccessibilityEvent(View v, AccessibilityEvent event) {
// Do nothing; API doesn't exist
}
public void onInitializeAccessibilityNodeInfo(View v, AccessibilityNodeInfoCompat info) {
// Do nothing; API doesn't exist
}
}
static class GBViewCompatImpl extends BaseViewCompatImpl {
@Override
public int getOverScrollMode(View v) {
return ViewCompatGingerbread.getOverScrollMode(v);
}
@Override
public void setOverScrollMode(View v, int mode) {
ViewCompatGingerbread.setOverScrollMode(v, mode);
}
}
/*
static class ICSViewCompatImpl extends GBViewCompatImpl {
@Override
public boolean canScrollHorizontally(View v, int direction) {
return ViewCompatICS.canScrollHorizontally(v, direction);
}
@Override
public boolean canScrollVertically(View v, int direction) {
return ViewCompatICS.canScrollVertically(v, direction);
}
@Override
public void onPopulateAccessibilityEvent(View v, AccessibilityEvent event) {
ViewCompatICS.onPopulateAccessibilityEvent(v, event);
}
@Override
public void onInitializeAccessibilityEvent(View v, AccessibilityEvent event) {
ViewCompatICS.onInitializeAccessibilityEvent(v, event);
}
@Override
public void onInitializeAccessibilityNodeInfo(View v, AccessibilityNodeInfoCompat info) {
ViewCompatICS.onInitializeAccessibilityNodeInfo(v, info.getImpl());
}
@Override
public void setAccessibilityDelegate(View v, AccessibilityDelegateCompat delegate) {
ViewCompatICS.setAccessibilityDelegate(v, delegate.getBridge());
}
}
*/
static final ViewCompatImpl IMPL;
static {
final int version = android.os.Build.VERSION.SDK_INT;
/*if (version >= 14) {
IMPL = new ICSViewCompatImpl();
} else*/ if (version >= 9) {
IMPL = new GBViewCompatImpl();
} else {
IMPL = new BaseViewCompatImpl();
}
}
public static boolean canScrollHorizontally(View v, int direction) {
return IMPL.canScrollHorizontally(v, direction);
}
public static boolean canScrollVertically(View v, int direction) {
return IMPL.canScrollVertically(v, direction);
}
public static int getOverScrollMode(View v) {
return IMPL.getOverScrollMode(v);
}
public static void setOverScrollMode(View v, int mode) {
IMPL.setOverScrollMode(v, mode);
}
public static void onPopulateAccessibilityEvent(View v, AccessibilityEvent event) {
IMPL.onPopulateAccessibilityEvent(v, event);
}
public static void onInitializeAccessibilityEvent(View v, AccessibilityEvent event) {
IMPL.onInitializeAccessibilityEvent(v, event);
}
public static void onInitializeAccessibilityNodeInfo(View v, AccessibilityNodeInfoCompat info) {
IMPL.onInitializeAccessibilityNodeInfo(v, info);
}
public static void setAccessibilityDelegate(View v, AccessibilityDelegateCompat delegate) {
IMPL.setAccessibilityDelegate(v, delegate);
}
}