/*
* Copyright 2013 Chris Banes
*
* 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 uk.co.senab.actionbarpulltorefresh.library.viewdelegates;
import android.annotation.TargetApi;
import android.os.Build;
import android.view.View;
import android.widget.AbsListView;
/**
* FIXME
*/
public class AbsListViewDelegate implements ViewDelegate {
public static final Class[] SUPPORTED_VIEW_CLASSES = { AbsListView.class };
@Override
public boolean isReadyForPull(View view, final float x, final float y) {
boolean ready = false;
// First we check whether we're scrolled to the top
AbsListView absListView = (AbsListView) view;
if (absListView.getCount() == 0) {
ready = true;
} else if (absListView.getFirstVisiblePosition() == 0) {
final View firstVisibleChild = absListView.getChildAt(0);
ready = firstVisibleChild != null && firstVisibleChild.getTop() >= 0;
}
// Then we have to check whether the fas scroller is enabled, and check we're not starting
// the gesture from the scroller
if (ready && absListView.isFastScrollEnabled() && isFastScrollAlwaysVisible(absListView)) {
switch (getVerticalScrollbarPosition(absListView)) {
case View.SCROLLBAR_POSITION_RIGHT:
ready = x < absListView.getRight() - absListView.getVerticalScrollbarWidth();
break;
case View.SCROLLBAR_POSITION_LEFT:
ready = x > absListView.getVerticalScrollbarWidth();
break;
}
}
return ready;
}
int getVerticalScrollbarPosition(AbsListView absListView) {
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ?
CompatV11.getVerticalScrollbarPosition(absListView) :
Compat.getVerticalScrollbarPosition(absListView);
}
boolean isFastScrollAlwaysVisible(AbsListView absListView) {
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ?
CompatV11.isFastScrollAlwaysVisible(absListView) :
Compat.isFastScrollAlwaysVisible(absListView);
}
static class Compat {
static int getVerticalScrollbarPosition(AbsListView absListView) {
return View.SCROLLBAR_POSITION_RIGHT;
}
static boolean isFastScrollAlwaysVisible(AbsListView absListView) {
return false;
}
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
static class CompatV11 {
static int getVerticalScrollbarPosition(AbsListView absListView) {
return absListView.getVerticalScrollbarPosition();
}
static boolean isFastScrollAlwaysVisible(AbsListView absListView) {
return absListView.isFastScrollAlwaysVisible();
}
}
}