X-Git-Url: https://git.mdrn.pl/mobilnebezpieczenstwo.git/blobdiff_plain/4b08fd3d054a0b4872d60adc7627bfdef069c39b..be45943134f44b96728f516e91a66149e51443c0:/app/src/main/java/com/samsung/srpol/parallax/ParallaxListViewHelper.java

diff --git a/app/src/main/java/com/samsung/srpol/parallax/ParallaxListViewHelper.java b/app/src/main/java/com/samsung/srpol/parallax/ParallaxListViewHelper.java
new file mode 100644
index 0000000..9e1a055
--- /dev/null
+++ b/app/src/main/java/com/samsung/srpol/parallax/ParallaxListViewHelper.java
@@ -0,0 +1,169 @@
+/*
+    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));
+        }
+    }
+}