1 files changed, 37 insertions, 0 deletions
diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/Util.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/Util.java
new file mode 100644
index 0000000..2e3e5ad
--- /dev/null
+++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/Util.java
@@ -0,0 +1,37 @@
+package com.github.chrisbanes.photoview;
+
+import android.view.MotionEvent;
+import android.widget.ImageView;
+
+class Util {
+
+    static void checkZoomLevels(float minZoom, float midZoom,
+                                float maxZoom) {
+        if (minZoom >= midZoom) {
+            throw new IllegalArgumentException(
+                    "Minimum zoom has to be less than Medium zoom. Call setMinimumZoom() with a more appropriate value");
+        } else if (midZoom >= maxZoom) {
+            throw new IllegalArgumentException(
+                    "Medium zoom has to be less than Maximum zoom. Call setMaximumZoom() with a more appropriate value");
+        }
+    }
+
+    static boolean hasDrawable(ImageView imageView) {
+        return imageView.getDrawable() != null;
+    }
+
+    static boolean isSupportedScaleType(final ImageView.ScaleType scaleType) {
+        if (scaleType == null) {
+            return false;
+        }
+        switch (scaleType) {
+            case MATRIX:
+                throw new IllegalStateException("Matrix scale type is not supported");
+        }
+        return true;
+    }
+
+    static int getPointerIndex(int action) {
+        return (action & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
+    }
+}