1 files changed, 117 insertions, 0 deletions
diff --git a/src/com/android/camera/tinyplanet/TinyPlanetPreview.java b/src/com/android/camera/tinyplanet/TinyPlanetPreview.java
new file mode 100644
index 000000000..7e7aff5fa
--- /dev/null
+++ b/src/com/android/camera/tinyplanet/TinyPlanetPreview.java
@@ -0,0 +1,117 @@
+/*
+ * 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.camera.tinyplanet;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.util.AttributeSet;
+import android.view.View;
+
+import java.util.concurrent.locks.Lock;
+
+/**
+ * Shows a preview of the TinyPlanet on the screen while editing.
+ */
+public class TinyPlanetPreview extends View {
+    /**
+     * Classes implementing this interface get informed about changes to the
+     * preview size.
+     */
+    public static interface PreviewSizeListener {
+        /**
+         * Called when the preview size has changed.
+         *
+         * @param sizePx the size in pixels of the square preview area
+         */
+        public void onSizeChanged(int sizePx);
+    }
+
+    private Paint mPaint = new Paint();
+    private Bitmap mPreview;
+    private Lock mLock;
+    private PreviewSizeListener mPreviewSizeListener;
+    private int mSize = 0;
+
+    public TinyPlanetPreview(Context context) {
+        super(context);
+    }
+
+    public TinyPlanetPreview(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public TinyPlanetPreview(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    /**
+     * Sets the bitmap and waits for a draw to happen before returning.
+     */
+    public void setBitmap(Bitmap preview, Lock lock) {
+        mPreview = preview;
+        mLock = lock;
+        invalidate();
+    }
+
+    public void setPreviewSizeChangeListener(PreviewSizeListener listener) {
+        mPreviewSizeListener = listener;
+        if (mSize > 0) {
+            mPreviewSizeListener.onSizeChanged(mSize);
+        }
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+        if (mLock != null && mLock.tryLock() && mPreview != null && !mPreview.isRecycled()) {
+            try {
+                canvas.drawBitmap(mPreview, 0, 0, mPaint);
+            } finally {
+                mLock.unlock();
+            }
+        }
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+
+        // Make sure the view is square
+        int size = Math.min(getMeasuredWidth(), getMeasuredHeight());
+        setMeasuredDimension(size, size);
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+        super.onLayout(changed, left, top, right, bottom);
+        if (changed && mPreviewSizeListener != null) {
+            int width = right - left;
+            int height = bottom - top;
+
+            // These should be the same as we enforce a square layout, but let's
+            // be safe.
+            int mSize = Math.min(width, height);
+
+            // Tell the listener about our new size so the renderer can adapt.
+            if (mSize > 0 && mPreviewSizeListener != null) {
+                mPreviewSizeListener.onSizeChanged(mSize);
+            }
+        }
+    }
+}