卡片效果

modules/mogo-module-common/src/main/java/com/yarolegovich/discretescrollview/Direction.java

@@ -0,0 +1,38 @@
+package com.yarolegovich.discretescrollview;
+
+/**
+ * Created by yarolegovich on 16.03.2017.
+ */
+enum Direction {
+
+    START {
+        @Override
+        public int applyTo(int delta) {
+            return delta * -1;
+        }
+
+        @Override
+        public boolean sameAs(int direction) {
+            return direction < 0;
+        }
+    },
+    END {
+        @Override
+        public int applyTo(int delta) {
+            return delta;
+        }
+
+        @Override
+        public boolean sameAs(int direction) {
+            return direction > 0;
+        }
+    };
+
+    public abstract int applyTo(int delta);
+
+    public abstract boolean sameAs(int direction);
+
+    public static Direction fromDelta(int delta) {
+        return delta > 0 ? END : START;
+    }
+}