1 files changed, 120 insertions, 0 deletions
diff --git a/src/org/cyanogenmod/audiofx/preset/InfiniteViewPager.java b/src/org/cyanogenmod/audiofx/preset/InfiniteViewPager.java
new file mode 100644
index 0000000..26e67f3
--- /dev/null
+++ b/src/org/cyanogenmod/audiofx/preset/InfiniteViewPager.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2016 The CyanogenMod Project
+ *
+ * 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 org.cyanogenmod.audiofx.preset;
+
+import android.content.Context;
+import android.support.v4.view.PagerAdapter;
+import android.support.v4.view.ViewPager;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+
+import org.cyanogenmod.audiofx.R;
+import org.cyanogenmod.audiofx.activity.EqualizerManager;
+import org.cyanogenmod.audiofx.activity.MasterConfigControl;
+
+/**
+ * A {@link ViewPager} that allows pseudo-infinite paging with a wrap-around effect. Should be used with an {@link
+ * InfinitePagerAdapter}.
+ */
+public class InfiniteViewPager extends ViewPager {
+
+    private final EqualizerManager mEqManager;
+
+    @Override
+    public boolean hasOverlappingRendering() {
+        return false;
+    }
+
+    public InfiniteViewPager(Context context) {
+        super(context);
+        mEqManager = MasterConfigControl.getInstance(context).getEqualizerManager();
+    }
+
+    public InfiniteViewPager(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        mEqManager = MasterConfigControl.getInstance(context).getEqualizerManager();
+    }
+
+    @Override
+    public boolean onInterceptTouchEvent(MotionEvent ev) {
+        if (mEqManager.isAnimatingToCustom()) {
+            return false;
+        }
+        return super.onInterceptTouchEvent(ev);
+    }
+
+    @Override
+    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        int textSize = getResources().getDimensionPixelSize(R.dimen.preset_text_size)
+                + getResources().getDimensionPixelSize(R.dimen.preset_text_padding);
+        super.onMeasure(widthMeasureSpec,
+                MeasureSpec.makeMeasureSpec(textSize, MeasureSpec.EXACTLY));
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent ev) {
+        if (mEqManager.isAnimatingToCustom()) {
+            return false;
+        }
+        boolean result;
+        try {
+            result = super.onTouchEvent(ev);
+        } catch (IllegalArgumentException e) {
+            /* There's a bug with the support library where it doesn't check
+             * the proper pointer index, so when multi touching the container,
+             * this can sometimes be thrown. Supposedly there are no downsides to just
+             * catching the exception and moving along, so let's do that....
+             */
+            result = false;
+        }
+        return result;
+    }
+
+    @Override
+    public void setAdapter(PagerAdapter adapter) {
+        super.setAdapter(adapter);
+        // offset first element so that we can scroll to the left
+        setCurrentItem(0);
+    }
+
+    @Override
+    public void setCurrentItem(int item) {
+        // offset the current item to ensure there is space to scroll
+        item = getOffsetAmount() + (item % getAdapter().getCount());
+        super.setCurrentItem(item);
+    }
+
+    public void setCurrentItemAbsolute(int item) {
+        super.setCurrentItem(item);
+    }
+
+    private int getOffsetAmount() {
+        if (getAdapter() instanceof InfinitePagerAdapter) {
+            InfinitePagerAdapter infAdapter = (InfinitePagerAdapter) getAdapter();
+            // allow for 100 back cycles from the beginning
+            // should be enough to create an illusion of infinity
+            // warning: scrolling to very high values (1,000,000+) results in
+            // strange drawing behaviour
+            return infAdapter.getRealCount() * 100;
+        } else {
+            return 0;
+        }
+    }
+
+    public void setCurrentItemAbsolute(int newPage, boolean b) {
+        super.setCurrentItem(newPage, b);
+    }
+}