AppBarSwipeRefreshLayout.java

/*
 * Copyright (c) 2015 Ha Duy Trung
 *
 * 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 io.github.hidroh.materialistic.widget;

import android.app.Activity;
import android.content.Context;
import android.support.design.widget.AppBarLayout;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.AttributeSet;

import io.github.hidroh.materialistic.R;

/**
 * Minor extension to {@link SwipeRefreshLayout} that is appbar-aware, only enabling when appbar
 * has been fully expanded.
 * This class assumes activity layout contains an {@link AppBarLayout} with {@link R.id#appbar}
 */
public class AppBarSwipeRefreshLayout extends SwipeRefreshLayout implements AppBarLayout.OnOffsetChangedListener {
    private AppBarLayout mAppBar;

    public AppBarSwipeRefreshLayout(Context context) {
        super(context);
    }

    public AppBarSwipeRefreshLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        if (getContext() instanceof Activity) {
            mAppBar = (AppBarLayout) ((Activity) getContext()).findViewById(R.id.appbar);
            if (mAppBar != null) {
                mAppBar.addOnOffsetChangedListener(this);
            }
        }
    }

    @Override
    protected void onDetachedFromWindow() {
        if (mAppBar != null) {
            mAppBar.removeOnOffsetChangedListener(this);
            mAppBar = null;
        }
        super.onDetachedFromWindow();
    }

    @Override
    public void onOffsetChanged(AppBarLayout appBarLayout, int i) {
        this.setEnabled(i == 0);
    }
}