1 files changed, 148 insertions, 0 deletions
diff --git a/src/com/android/camera/ui/CaptureAnimationOverlay.java b/src/com/android/camera/ui/CaptureAnimationOverlay.java
new file mode 100644
index 000000000..36c9a1131
--- /dev/null
+++ b/src/com/android/camera/ui/CaptureAnimationOverlay.java
@@ -0,0 +1,148 @@
+/*
+ * 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.ui;
+
+import android.animation.Animator;
+import android.animation.AnimatorSet;
+import android.animation.ValueAnimator;
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.RectF;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.animation.Interpolator;
+import android.view.animation.LinearInterpolator;
+
+/**
+ * This class handles all the animations at capture time. Post capture animations
+ * will be handled in a separate place.
+ */
+public class CaptureAnimationOverlay extends View {
+    private final static String TAG = CaptureAnimationOverlay.class.getSimpleName();
+
+    private final static int FLASH_COLOR = Color.WHITE;
+
+    private static final float FLASH_MAX_ALPHA = 0.85f;
+    private static final long FLASH_FULL_DURATION_MS = 65;
+    private static final long FLASH_DECREASE_DURATION_MS = 150;
+    private static final float SHORT_FLASH_MAX_ALPHA = 0.75f;
+    private static final long SHORT_FLASH_FULL_DURATION_MS = 34;
+    private static final long SHORT_FLASH_DECREASE_DURATION_MS = 100;
+
+    private AnimatorSet mFlashAnimation;
+    private final RectF mPreviewArea = new RectF();
+    private final Paint mPaint = new Paint();
+    private final Interpolator mFlashAnimInterpolator;
+    private final ValueAnimator.AnimatorUpdateListener mFlashAnimUpdateListener;
+    private final Animator.AnimatorListener mFlashAnimListener;
+
+    public CaptureAnimationOverlay(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        mPaint.setColor(FLASH_COLOR);
+        mFlashAnimInterpolator = new LinearInterpolator();
+        mFlashAnimUpdateListener = new ValueAnimator.AnimatorUpdateListener() {
+            @Override
+            public void onAnimationUpdate(ValueAnimator animation) {
+                float alpha = 255.0f * (Float) animation.getAnimatedValue();
+                mPaint.setAlpha((int) alpha);
+                invalidate();
+            }
+        };
+        mFlashAnimListener = new Animator.AnimatorListener() {
+            @Override
+            public void onAnimationStart(Animator animation) {
+                setVisibility(VISIBLE);
+            }
+
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                mFlashAnimation = null;
+                setVisibility(GONE);
+            }
+
+            @Override
+            public void onAnimationCancel(Animator animation) {
+                // End is always called after cancel.
+            }
+
+            @Override
+            public void onAnimationRepeat(Animator animation) {
+
+            }
+        };
+    }
+
+    /**
+     * Start flash animation.
+     *
+     * @param shortFlash show shortest possible flash instead of regular long version.
+     */
+    public void startFlashAnimation(boolean shortFlash) {
+        if (mFlashAnimation != null && mFlashAnimation.isRunning()) {
+            mFlashAnimation.cancel();
+        }
+        float maxAlpha;
+
+        if (shortFlash) {
+            maxAlpha = SHORT_FLASH_MAX_ALPHA;
+        } else {
+            maxAlpha = FLASH_MAX_ALPHA;
+        }
+
+        ValueAnimator flashAnim1 = ValueAnimator.ofFloat(maxAlpha, maxAlpha);
+        ValueAnimator flashAnim2 = ValueAnimator.ofFloat(maxAlpha, .0f);
+
+        if (shortFlash) {
+            flashAnim1.setDuration(SHORT_FLASH_FULL_DURATION_MS);
+            flashAnim2.setDuration(SHORT_FLASH_DECREASE_DURATION_MS);
+        } else {
+            flashAnim1.setDuration(FLASH_FULL_DURATION_MS);
+            flashAnim2.setDuration(FLASH_DECREASE_DURATION_MS);
+        }
+
+        flashAnim1.addUpdateListener(mFlashAnimUpdateListener);
+        flashAnim2.addUpdateListener(mFlashAnimUpdateListener);
+        flashAnim1.setInterpolator(mFlashAnimInterpolator);
+        flashAnim2.setInterpolator(mFlashAnimInterpolator);
+
+        mFlashAnimation = new AnimatorSet();
+        mFlashAnimation.play(flashAnim1).before(flashAnim2);
+        mFlashAnimation.addListener(mFlashAnimListener);
+        mFlashAnimation.start();
+    }
+
+    @Override
+    public void onDraw(Canvas canvas) {
+        if (mFlashAnimation != null && mFlashAnimation.isRunning()) {
+            // mPaint alpha is animated by the animation.
+            canvas.drawRect(mPreviewArea, mPaint);
+            canvas.clipRect(mPreviewArea);
+        }
+    }
+
+    @Override
+    public boolean hasOverlappingRendering() {
+        // The internal draw method will NOT have draw calls that overlap.
+        return false;
+    }
+
+    public void setPreviewRect(RectF previewArea) {
+        mPreviewArea.set(previewArea);
+    }
+}