1 files changed, 130 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ingest/ui/MtpImageView.java b/src/com/android/gallery3d/ingest/ui/MtpImageView.java
new file mode 100644
index 000000000..9c197851e
--- /dev/null
+++ b/src/com/android/gallery3d/ingest/ui/MtpImageView.java
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2013 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.ingest.ui;
+
+import android.content.Context;
+import android.mtp.MtpDevice;
+import android.mtp.MtpObjectInfo;
+import android.os.AsyncTask;
+import android.util.AttributeSet;
+import android.widget.ImageView;
+
+import com.android.gallery3d.ingest.data.BitmapWithMetadata;
+import com.android.gallery3d.ingest.data.MtpBitmapFetch;
+
+public class MtpImageView extends ImageView {
+    private static final int FADE_IN_TIME_MS = 80;
+
+    private int mObjectHandle;
+    private int mGeneration;
+
+    private void init() {
+         showPlaceholder();
+    }
+
+    public MtpImageView(Context context) {
+        super(context);
+        init();
+    }
+
+    public MtpImageView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+
+    public MtpImageView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init();
+    }
+
+    private void showPlaceholder() {
+        setImageResource(android.R.color.transparent);
+    }
+
+    private LoadMtpImageTask mTask;
+
+    public void setMtpDeviceAndObjectInfo(MtpDevice device, MtpObjectInfo object, int gen) {
+        int handle = object.getObjectHandle();
+        if (handle == mObjectHandle && gen == mGeneration) {
+            return;
+        }
+        cancelLoadingAndClear();
+        showPlaceholder();
+        mGeneration = gen;
+        mObjectHandle = handle;
+        mTask = new LoadMtpImageTask(device);
+        mTask.execute(object);
+    }
+
+    protected Object fetchMtpImageDataFromDevice(MtpDevice device, MtpObjectInfo info) {
+        return MtpBitmapFetch.getFullsize(device, info);
+    }
+
+    protected void onMtpImageDataFetchedFromDevice(Object result) {
+        BitmapWithMetadata bitmapWithMetadata = (BitmapWithMetadata)result;
+        setImageBitmap(bitmapWithMetadata.bitmap);
+        setRotation(bitmapWithMetadata.rotationDegrees);
+    }
+
+    private class LoadMtpImageTask extends AsyncTask<MtpObjectInfo, Void, Object> {
+        private MtpDevice mDevice;
+
+        public LoadMtpImageTask(MtpDevice device) {
+            mDevice = device;
+        }
+
+        @Override
+        protected Object doInBackground(MtpObjectInfo... args) {
+            Object result = null;
+            if (!isCancelled()) {
+                result = fetchMtpImageDataFromDevice(mDevice, args[0]);
+            }
+            mDevice = null;
+            return result;
+        }
+
+        @Override
+        protected void onPostExecute(Object result) {
+            if (isCancelled() || result == null) {
+                return;
+            }
+            setAlpha(0f);
+            onMtpImageDataFetchedFromDevice(result);
+            animate().alpha(1f).setDuration(FADE_IN_TIME_MS);
+        }
+
+        @Override
+        protected void onCancelled() {
+        }
+    }
+
+    protected void cancelLoadingAndClear() {
+        if (mTask != null) {
+            mTask.cancel(true);
+        }
+        mTask = null;
+        animate().cancel();
+        setImageResource(android.R.color.transparent);
+        setRotation(0);
+    }
+
+    @Override
+    public void onDetachedFromWindow() {
+        cancelLoadingAndClear();
+        super.onDetachedFromWindow();
+    }
+}