VaryViewHelper.java

/*
 * Copyright (c) 2015 [1076559197@qq.com | tchen0707@gmail.com]
 *
 * 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.dreamspace.uucampus.common;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;


public class VaryViewHelper implements IVaryViewHelper {
    private View view;
    private ViewGroup parentView;
    private int viewIndex;
    private ViewGroup.LayoutParams params;
    private View currentView;

    public VaryViewHelper(View view) {
        super();
        this.view = view;
    }

    private void init() {
        params = view.getLayoutParams();
        if (view.getParent() != null) {
            parentView = (ViewGroup) view.getParent();
        } else {
            parentView = (ViewGroup) view.getRootView().findViewById(android.R.id.content);
        }
        int count = parentView.getChildCount();
        for (int index = 0; index < count; index++) {
            if (view == parentView.getChildAt(index)) {
                viewIndex = index;
                break;
            }
        }
        currentView = view;
    }

    @Override
    public View getCurrentLayout() {
        return currentView;
    }

    @Override
    public void restoreView() {
        showLayout(view);
    }

    @Override
    public void showLayout(View view) {
        if (parentView == null) {
            init();
        }
        this.currentView = view;
        // 如果已经是那个view，那就不需要再进行替换操作了
        if (parentView.getChildAt(viewIndex) != view) {
            ViewGroup parent = (ViewGroup) view.getParent();
            if (parent != null) {
                parent.removeView(view);
            }
            parentView.removeViewAt(viewIndex);
            parentView.addView(view, viewIndex, params);
        }
    }

    @Override
    public View inflate(int layoutId) {
        return LayoutInflater.from(view.getContext()).inflate(layoutId, null);
    }

    @Override
    public Context getContext() {
        return view.getContext();
    }

    @Override
    public View getView() {
        return view;
    }
}