net.peterkuterna.android.apps.devoxxfrsched.ui.ProgressFragment.java Source code

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Here is the source code for net.peterkuterna.android.apps.devoxxfrsched.ui.ProgressFragment.java

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/*
 * Copyright (C) 2011 The Android Open Source Project
 * Copyright (C) 2011 Peter Kuterna
 *
 * 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 net.peterkuterna.android.apps.devoxxfrsched.ui;

import com.actionbarsherlock.app.SherlockFragment;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;

public abstract class ProgressFragment extends SherlockFragment {

    static final int INTERNAL_EMPTY_ID = 0x00ff0001;
    static final int INTERNAL_PROGRESS_CONTAINER_ID = 0x00ff0002;
    static final int INTERNAL_CONTENT_CONTAINER_ID = 0x00ff0003;

    private View mProgressContainer;
    private View mContentContainer;
    private View mContent;
    private TextView mStandardEmptyView;
    private CharSequence mEmptyText;
    private boolean mContentShown;

    abstract View onCreateContentView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState);

    abstract int getContentResourceId();

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        final Context context = getActivity();

        FrameLayout root = new FrameLayout(context);

        LinearLayout pframe = new LinearLayout(context);
        pframe.setId(INTERNAL_PROGRESS_CONTAINER_ID);
        pframe.setOrientation(LinearLayout.VERTICAL);
        pframe.setVisibility(View.GONE);
        pframe.setGravity(Gravity.CENTER);

        ProgressBar progress = new ProgressBar(context, null, android.R.attr.progressBarStyleLarge);
        pframe.addView(progress, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT));

        root.addView(pframe, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
                ViewGroup.LayoutParams.FILL_PARENT));

        FrameLayout cframe = new FrameLayout(context);
        cframe.setId(INTERNAL_CONTENT_CONTAINER_ID);

        TextView tv = new TextView(context);
        tv.setId(INTERNAL_EMPTY_ID);
        tv.setGravity(Gravity.CENTER);
        cframe.addView(tv, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
                ViewGroup.LayoutParams.FILL_PARENT));

        View contentView = onCreateContentView(inflater, cframe, savedInstanceState);
        cframe.addView(contentView, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
                ViewGroup.LayoutParams.FILL_PARENT));

        root.addView(cframe, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
                ViewGroup.LayoutParams.FILL_PARENT));

        root.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
                ViewGroup.LayoutParams.FILL_PARENT));

        return root;
    }

    private void ensureContent() {
        if (mContent != null) {
            return;
        }
        View root = getView();
        if (root == null) {
            throw new IllegalStateException("Content view not yet created");
        }

        mStandardEmptyView = (TextView) root.findViewById(INTERNAL_EMPTY_ID);
        mStandardEmptyView.setVisibility(View.GONE);
        mProgressContainer = root.findViewById(INTERNAL_PROGRESS_CONTAINER_ID);
        mContentContainer = root.findViewById(INTERNAL_CONTENT_CONTAINER_ID);

        mContent = mContentContainer.findViewById(getContentResourceId());
        if (mContent == null) {
            throw new IllegalStateException("Content view not created");
        }

        if (mEmptyText != null) {
            mStandardEmptyView.setText(mEmptyText);
        }

        mContentShown = true;
    }

    public void setEmptyText(CharSequence text) {
        ensureContent();
        if (mStandardEmptyView == null) {
            throw new IllegalStateException("Can't be used with a custom content view");
        }
        mEmptyText = text;
        mStandardEmptyView.setText(text);
    }

    public void showEmptyText(boolean show) {
        ensureContent();
        if (mStandardEmptyView == null) {
            throw new IllegalStateException("Can't be used with a custom content view");
        }
        mStandardEmptyView.setVisibility(show ? View.VISIBLE : View.GONE);
    }

    public void setContentShown(boolean shown) {
        setContentShown(shown, true);
    }

    public void setContentShownNoAnimation(boolean shown) {
        setContentShown(shown, false);
    }

    private void setContentShown(boolean shown, boolean animate) {
        ensureContent();
        if (mProgressContainer == null) {
            throw new IllegalStateException("Can't be used with a custom content view");
        }
        if (mContentShown == shown) {
            return;
        }
        mContentShown = shown;
        if (shown) {
            if (animate) {
                mProgressContainer
                        .startAnimation(AnimationUtils.loadAnimation(getActivity(), android.R.anim.fade_out));
                mContentContainer
                        .startAnimation(AnimationUtils.loadAnimation(getActivity(), android.R.anim.fade_in));
            } else {
                mProgressContainer.clearAnimation();
                mContentContainer.clearAnimation();
            }
            mProgressContainer.setVisibility(View.GONE);
            mContentContainer.setVisibility(View.VISIBLE);
        } else {
            if (animate) {
                mProgressContainer
                        .startAnimation(AnimationUtils.loadAnimation(getActivity(), android.R.anim.fade_in));
                mContentContainer
                        .startAnimation(AnimationUtils.loadAnimation(getActivity(), android.R.anim.fade_out));
            } else {
                mProgressContainer.clearAnimation();
                mContentContainer.clearAnimation();
            }
            mProgressContainer.setVisibility(View.VISIBLE);
            mContentContainer.setVisibility(View.GONE);
        }
    }

}