com.zhi.android.modules.welcome.WelcomePageFragment.java Source code

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Here is the source code for com.zhi.android.modules.welcome.WelcomePageFragment.java

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/*
 * Copyright [2017] [zhi]
 *
 * 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.zhi.android.modules.welcome;

import android.content.res.Resources;
import android.os.Bundle;
import android.support.annotation.IntRange;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewStub;
import android.widget.TextView;

import com.google.common.collect.Lists;

import java.util.List;

public class WelcomePageFragment extends Fragment {
    public static final String ARGS_PAGE_INDEX = "args-page-index";
    public static final String ARGS_PAGE_OPTION = "args-page-option";

    public static WelcomePageFragment newInstance(@IntRange(from = 0) int pageIndex,
            @NonNull WelcomePageOption pageOption) {
        final WelcomePageFragment pf = new WelcomePageFragment();
        final Bundle args = new Bundle();
        args.putInt(ARGS_PAGE_INDEX, pageIndex);
        args.putParcelable(ARGS_PAGE_OPTION, pageOption);
        pf.setArguments(args);
        return pf;
    }

    public WelcomePageFragment() {
        // LEFT EMPTY
    }

    @IntRange(from = 0)
    private int mPageIndex;
    private WelcomePageOption mPageOption;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mPageIndex = getArguments().getInt(ARGS_PAGE_INDEX);
        mPageOption = getArguments().getParcelable(ARGS_PAGE_OPTION);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
            @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.welcome_page, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        final ViewStub stub = view.findViewById(R.id.welcome_layout);
        if (mPageOption.layout != 0) {
            stub.setLayoutResource(mPageOption.layout);
            final View warmView = stub.inflate();
            warmView.setTag(warmViewTag(mPageIndex));
            warmView.setTag(R.id.welcome_layout, new WarmInfo(warmView, getResources()));
        }

        final TextView primaryView = view.findViewById(R.id.welcome_primary);
        if (mPageOption.primary != 0) {
            primaryView.setText(mPageOption.primary);
        }

        final TextView blurbView = view.findViewById(R.id.welcome_blurb);
        if (mPageOption.blurb != 0) {
            blurbView.setText(mPageOption.blurb);
        }
    }

    public static String warmViewTag(int pageIndex) {
        return "welcome:warm:tag" + pageIndex;
    }

    public static void onPageWarm(@NonNull View view, float offset) {
        final Object layoutTag = view.getTag(R.id.welcome_layout);
        if (layoutTag instanceof WarmInfo) {
            final WarmInfo warmInfo = (WarmInfo) layoutTag;
            warmInfo.onPageWarm(offset);
        }
    }

    private static class WarmInfo {
        final float layer2Offset;
        final float layer3Offset;
        final List<View> layers2Views;
        final List<View> layers3Views;

        WarmInfo(View view, Resources res) {
            layer2Offset = res.getDimension(R.dimen.layer_2_offset);
            layer3Offset = res.getDimension(R.dimen.layer_3_offset);

            layers2Views = Lists.newArrayList();
            layers3Views = Lists.newArrayList();

            with(view, layers2Views, layers3Views);
        }

        static void with(View view, List<View> layers2, List<View> layers3) {
            if (view instanceof ViewGroup) {
                final int childCount = ((ViewGroup) view).getChildCount();
                for (int i = 0; i < childCount; i++) {
                    with(((ViewGroup) view).getChildAt(i), layers2, layers3);
                }
            } else if ("2".equals(view.getTag())) {
                layers2.add(view);
            } else if ("3".equals(view.getTag())) {
                layers3.add(view);
            }
        }

        void onPageWarm(float offset) {
            for (View view : layers2Views) {
                view.setTranslationX(layer2Offset * offset);
            }
            for (View view : layers3Views) {
                view.setTranslationX(layer3Offset * offset);
            }
        }
    }
}