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Diffstat (limited to 'src/com/android/gallery3d/anim/AlphaAnimation.java')
-rw-r--r-- | src/com/android/gallery3d/anim/AlphaAnimation.java | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/anim/AlphaAnimation.java b/src/com/android/gallery3d/anim/AlphaAnimation.java new file mode 100644 index 000000000..cb17527b8 --- /dev/null +++ b/src/com/android/gallery3d/anim/AlphaAnimation.java @@ -0,0 +1,48 @@ +/* + * 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.anim; + +import com.android.gallery3d.common.Utils; +import com.android.gallery3d.ui.GLCanvas; + +public class AlphaAnimation extends CanvasAnimation { + private final float mStartAlpha; + private final float mEndAlpha; + private float mCurrentAlpha; + + public AlphaAnimation(float from, float to) { + mStartAlpha = from; + mEndAlpha = to; + mCurrentAlpha = from; + } + + @Override + public void apply(GLCanvas canvas) { + canvas.multiplyAlpha(mCurrentAlpha); + } + + @Override + public int getCanvasSaveFlags() { + return GLCanvas.SAVE_FLAG_ALPHA; + } + + @Override + protected void onCalculate(float progress) { + mCurrentAlpha = Utils.clamp(mStartAlpha + + (mEndAlpha - mStartAlpha) * progress, 0f, 1f); + } +} |