1 files changed, 78 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ui/ProgressSpinner.java b/src/com/android/gallery3d/ui/ProgressSpinner.java
new file mode 100644
index 000000000..e4d60242b
--- /dev/null
+++ b/src/com/android/gallery3d/ui/ProgressSpinner.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2010 The Android Open Source 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 com.android.gallery3d.ui;
+
+import com.android.gallery3d.R;
+
+import android.content.Context;
+
+public class ProgressSpinner {
+    private static float ROTATE_SPEED_OUTER = 1080f / 3500f;
+    private static float ROTATE_SPEED_INNER = -720f / 3500f;
+    private final ResourceTexture mOuter;
+    private final ResourceTexture mInner;
+    private final int mWidth;
+    private final int mHeight;
+
+    private float mInnerDegree = 0f;
+    private float mOuterDegree = 0f;
+    private long mAnimationTimestamp = -1;
+
+    public ProgressSpinner(Context context) {
+        mOuter = new ResourceTexture(context, R.drawable.spinner_76_outer_holo);
+        mInner = new ResourceTexture(context, R.drawable.spinner_76_inner_holo);
+
+        mWidth = Math.max(mOuter.getWidth(), mInner.getWidth());
+        mHeight = Math.max(mOuter.getHeight(), mInner.getHeight());
+    }
+
+    public int getWidth() {
+        return mWidth;
+    }
+
+    public int getHeight() {
+        return mHeight;
+    }
+
+    public void startAnimation() {
+        mAnimationTimestamp = -1;
+        mOuterDegree = 0;
+        mInnerDegree = 0;
+    }
+
+    public void draw(GLCanvas canvas, int x, int y) {
+        long now = canvas.currentAnimationTimeMillis();
+        if (mAnimationTimestamp == -1) mAnimationTimestamp = now;
+        mOuterDegree += (now - mAnimationTimestamp) * ROTATE_SPEED_OUTER;
+        mInnerDegree += (now - mAnimationTimestamp) * ROTATE_SPEED_INNER;
+
+        mAnimationTimestamp = now;
+
+        // just preventing overflow
+        if (mOuterDegree > 360) mOuterDegree -= 360f;
+        if (mInnerDegree < 0) mInnerDegree += 360f;
+
+        canvas.save(GLCanvas.SAVE_FLAG_MATRIX);
+
+        canvas.translate(x + mWidth / 2, y + mHeight / 2, 0);
+        canvas.rotate(mInnerDegree, 0, 0, 1);
+        mOuter.draw(canvas, -mOuter.getWidth() / 2, -mOuter.getHeight() / 2);
+        canvas.rotate(mOuterDegree - mInnerDegree, 0, 0, 1);
+        mInner.draw(canvas, -mInner.getWidth() / 2, -mInner.getHeight() / 2);
+        canvas.restore();
+    }
+}