-/*
- The MIT License (MIT)
-
- Copyright (c) 2014 Nir Hartmann
-
- Permission is hereby granted, free of charge, to any person obtaining a copy
- of this software and associated documentation files (the "Software"), to deal
- in the Software without restriction, including without limitation the rights
- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- copies of the Software, and to permit persons to whom the Software is
- furnished to do so, subject to the following conditions:
-
- The above copyright notice and this permission notice shall be included in all
- copies or substantial portions of the Software.
-
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- SOFTWARE.
- */
-package com.samsung.srpol.parallax;
-
-import com.samsung.srpol.R;
-
-import android.content.Context;
-import android.content.res.TypedArray;
-import android.util.AttributeSet;
-import android.view.View;
-import android.view.animation.TranslateAnimation;
-import android.widget.AbsListView;
-import android.widget.AbsListView.OnScrollListener;
-import android.widget.ListView;
-
-public class ParallaxListViewHelper implements OnScrollListener {
-
- private static final float DEFAULT_ALPHA_FACTOR = -1F;
- private static final float DEFAULT_PARALLAX_FACTOR = 1.9F;
- private static final boolean DEFAULT_IS_CIRCULAR = false;
- private float parallaxFactor = DEFAULT_PARALLAX_FACTOR;
- private float alphaFactor = DEFAULT_ALPHA_FACTOR;
- private ParallaxedView parallaxedView;
- private boolean isCircular;
- private OnScrollListener listener = null;
- private ListView listView;
-
- protected ParallaxListViewHelper(Context context, AttributeSet attrs,
- ListView listView) {
- init(context, attrs, listView);
- }
-
- protected void init(Context context, AttributeSet attrs, ListView listView) {
- this.listView = listView;
- TypedArray typeArray = context.obtainStyledAttributes(attrs,
- R.styleable.ParallaxScroll);
- this.parallaxFactor = typeArray.getFloat(
- R.styleable.ParallaxScroll_parallax_factor,
- DEFAULT_PARALLAX_FACTOR);
- this.alphaFactor = typeArray.getFloat(
- R.styleable.ParallaxScroll_alpha_factor, DEFAULT_ALPHA_FACTOR);
- this.isCircular = typeArray.getBoolean(
- R.styleable.ParallaxScroll_circular_parallax,
- DEFAULT_IS_CIRCULAR);
- typeArray.recycle();
- }
-
- protected void setOnScrollListener(OnScrollListener l) {
- this.listener = l;
- }
-
- protected void addParallaxedHeaderView(View v) {
- addParallaxedView(v);
- }
-
- protected void addParallaxedHeaderView(View v, Object data,
- boolean isSelectable) {
- addParallaxedView(v);
- }
-
- protected void addParallaxedView(View v) {
- this.parallaxedView = new ListViewParallaxedItem(v);
- }
-
- protected void parallaxScroll() {
- if (isCircular)
- circularParallax();
- else
- headerParallax();
- }
-
- private void circularParallax() {
- if (listView.getChildCount() > 0) {
- int top = -listView.getChildAt(0).getTop();
- if (top >= 0) {
- fillParallaxedViews();
- setFilters(top);
- }
- }
- }
-
- private void headerParallax() {
- if (parallaxedView != null) {
- if (listView.getChildCount() > 0) {
- int top = -listView.getChildAt(0).getTop();
- if (top >= 0) {
- setFilters(top);
- }
- }
- }
- }
-
- private void setFilters(int top) {
- parallaxedView.setOffset((float) top / parallaxFactor);
- if (alphaFactor != DEFAULT_ALPHA_FACTOR) {
- float alpha = (top <= 0) ? 1 : (100 / ((float) top * alphaFactor));
- parallaxedView.setAlpha(alpha);
- }
- parallaxedView.animateNow();
- }
-
- private void fillParallaxedViews() {
- if (parallaxedView == null
- || parallaxedView.is(listView.getChildAt(0)) == false) {
- if (parallaxedView != null) {
- resetFilters();
- parallaxedView.setView(listView.getChildAt(0));
- } else {
- parallaxedView = new ListViewParallaxedItem(
- listView.getChildAt(0));
- }
- }
- }
-
- private void resetFilters() {
- parallaxedView.setOffset(0);
- if (alphaFactor != DEFAULT_ALPHA_FACTOR)
- parallaxedView.setAlpha(1F);
- parallaxedView.animateNow();
- }
-
- @Override
- public void onScroll(AbsListView view, int firstVisibleItem,
- int visibleItemCount, int totalItemCount) {
- parallaxScroll();
- if (this.listener != null)
- this.listener.onScroll(view, firstVisibleItem, visibleItemCount,
- totalItemCount);
- }
-
- @Override
- public void onScrollStateChanged(AbsListView view, int scrollState) {
- if (this.listener != null)
- this.listener.onScrollStateChanged(view, scrollState);
- }
-
- protected class ListViewParallaxedItem extends ParallaxedView {
-
- public ListViewParallaxedItem(View view) {
- super(view);
- }
-
- @Override
- protected void translatePreICS(View view, float offset) {
- addAnimation(new TranslateAnimation(0, 0, offset, offset));
- }
- }
-}
fnp / mobilnebezpieczenstwo.git / blobdiff