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author | Sunny Goyal <sunnygoyal@google.com> | 2016-05-09 20:43:21 -0700 |
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committer | Sunny Goyal <sunnygoyal@google.com> | 2016-06-08 15:00:09 -0700 |
commit | 3333b0ced8e6743c41909f6f6b916f1f9ec5a004 (patch) | |
tree | 7fd735821e3393a0dfe8691087f58ebbaa9dafae /src/com/android/launcher3/keyboard/FocusIndicatorHelper.java | |
parent | ab06999a70c773ffbc0aadaf938e0e90f8ca09b2 (diff) | |
download | android_packages_apps_Trebuchet-3333b0ced8e6743c41909f6f6b916f1f9ec5a004.tar.gz android_packages_apps_Trebuchet-3333b0ced8e6743c41909f6f6b916f1f9ec5a004.tar.bz2 android_packages_apps_Trebuchet-3333b0ced8e6743c41909f6f6b916f1f9ec5a004.zip |
Unifying focus indicator handling for workspace and all-apps
Adding an abstract FocusIndicatorHelper based on FocusIndicatorView
which draws the background instead of using a dummy view.
Change-Id: Id560195323d2ddad8fcd77ba675cf3f4fd4a94ab
Diffstat (limited to 'src/com/android/launcher3/keyboard/FocusIndicatorHelper.java')
-rw-r--r-- | src/com/android/launcher3/keyboard/FocusIndicatorHelper.java | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/src/com/android/launcher3/keyboard/FocusIndicatorHelper.java b/src/com/android/launcher3/keyboard/FocusIndicatorHelper.java new file mode 100644 index 000000000..7672f5a79 --- /dev/null +++ b/src/com/android/launcher3/keyboard/FocusIndicatorHelper.java @@ -0,0 +1,242 @@ +/* + * Copyright (C) 2016 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.launcher3.keyboard; + +import android.animation.Animator; +import android.animation.AnimatorListenerAdapter; +import android.animation.ObjectAnimator; +import android.animation.PropertyValuesHolder; +import android.animation.RectEvaluator; +import android.animation.ValueAnimator; +import android.animation.ValueAnimator.AnimatorUpdateListener; +import android.annotation.TargetApi; +import android.graphics.Canvas; +import android.graphics.Color; +import android.graphics.Paint; +import android.graphics.Rect; +import android.os.Build.VERSION_CODES; +import android.util.Property; +import android.view.View; +import android.view.View.OnFocusChangeListener; + +import com.android.launcher3.R; + +/** + * A helper class to draw background of a focused view. + */ +@TargetApi(VERSION_CODES.LOLLIPOP) +public abstract class FocusIndicatorHelper implements + OnFocusChangeListener, AnimatorUpdateListener { + + private static final float MIN_VISIBLE_ALPHA = 0.2f; + private static final long ANIM_DURATION = 150; + + public static final Property<FocusIndicatorHelper, Float> ALPHA = + new Property<FocusIndicatorHelper, Float>(Float.TYPE, "alpha") { + @Override + public void set(FocusIndicatorHelper object, Float value) { + object.setAlpha(value); + } + + @Override + public Float get(FocusIndicatorHelper object) { + return object.mAlpha; + } + }; + + public static final Property<FocusIndicatorHelper, Float> SHIFT = + new Property<FocusIndicatorHelper, Float>( + Float.TYPE, "shift") { + + @Override + public void set(FocusIndicatorHelper object, Float value) { + object.mShift = value; + } + + @Override + public Float get(FocusIndicatorHelper object) { + return object.mShift; + } + }; + + private static final RectEvaluator RECT_EVALUATOR = new RectEvaluator(new Rect()); + private static final Rect sTempRect1 = new Rect(); + private static final Rect sTempRect2 = new Rect(); + + private final View mContainer; + private final Paint mPaint; + private final int mMaxAlpha; + + private final Rect mDirtyRect = new Rect(); + private boolean mIsDirty = false; + + private View mLastFocusedView; + + private View mCurrentView; + private View mTargetView; + /** + * The fraction indicating the position of the focusRect between {@link #mCurrentView} + * & {@link #mTargetView} + */ + private float mShift; + + private ObjectAnimator mCurrentAnimation; + private float mAlpha; + + public FocusIndicatorHelper(View container) { + mContainer = container; + + mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); + int color = container.getResources().getColor(R.color.focused_background); + mMaxAlpha = Color.alpha(color); + mPaint.setColor(0xFF000000 | color); + + setAlpha(0); + mShift = 0; + } + + protected void setAlpha(float alpha) { + mAlpha = alpha; + mPaint.setAlpha((int) (mAlpha * mMaxAlpha)); + } + + @Override + public void onAnimationUpdate(ValueAnimator animation) { + invalidateDirty(); + } + + protected void invalidateDirty() { + if (mIsDirty) { + mContainer.invalidate(mDirtyRect); + mIsDirty = false; + } + + Rect newRect = getDrawRect(); + if (newRect != null) { + mContainer.invalidate(newRect); + } + } + + public void draw(Canvas c) { + if (mAlpha > 0) { + Rect newRect = getDrawRect(); + if (newRect != null) { + mDirtyRect.set(newRect); + c.drawRect(mDirtyRect, mPaint); + mIsDirty = true; + } + } + } + + private Rect getDrawRect() { + if (mCurrentView != null) { + viewToRect(mCurrentView, sTempRect1); + + if (mShift > 0 && mTargetView != null) { + viewToRect(mTargetView, sTempRect2); + return RECT_EVALUATOR.evaluate(mShift, sTempRect1, sTempRect2); + } else { + return sTempRect1; + } + } + return null; + } + + @Override + public void onFocusChange(View v, boolean hasFocus) { + if (hasFocus) { + endCurrentAnimation(); + + if (mAlpha > MIN_VISIBLE_ALPHA) { + mTargetView = v; + + mCurrentAnimation = ObjectAnimator.ofPropertyValuesHolder(this, + PropertyValuesHolder.ofFloat(ALPHA, 1), + PropertyValuesHolder.ofFloat(SHIFT, 1)); + mCurrentAnimation.addListener(new ViewSetListener(v, true)); + } else { + setCurrentView(v); + + mCurrentAnimation = ObjectAnimator.ofPropertyValuesHolder(this, + PropertyValuesHolder.ofFloat(ALPHA, 1)); + } + + mLastFocusedView = v; + } else { + if (mLastFocusedView == v) { + mLastFocusedView = null; + endCurrentAnimation(); + mCurrentAnimation = ObjectAnimator.ofPropertyValuesHolder(this, + PropertyValuesHolder.ofFloat(ALPHA, 0)); + mCurrentAnimation.addListener(new ViewSetListener(null, false)); + } + } + + // invalidate once + invalidateDirty(); + + mLastFocusedView = hasFocus ? v : null; + if (mCurrentAnimation != null) { + mCurrentAnimation.addUpdateListener(this); + mCurrentAnimation.setDuration(ANIM_DURATION).start(); + } + } + + protected void endCurrentAnimation() { + if (mCurrentAnimation != null) { + mCurrentAnimation.cancel(); + mCurrentAnimation = null; + } + } + + protected void setCurrentView(View v) { + mCurrentView = v; + mShift = 0; + mTargetView = null; + } + + /** + * Gets the position of {@param v} relative to {@link #mContainer}. + */ + public abstract void viewToRect(View v, Rect outRect); + + private class ViewSetListener extends AnimatorListenerAdapter { + private final View mViewToSet; + private final boolean mCallOnCancel; + private boolean mCalled = false; + + public ViewSetListener(View v, boolean callOnCancel) { + mViewToSet = v; + mCallOnCancel = callOnCancel; + } + + @Override + public void onAnimationCancel(Animator animation) { + if (!mCallOnCancel) { + mCalled = true; + } + } + + @Override + public void onAnimationEnd(Animator animation) { + if (!mCalled) { + setCurrentView(mViewToSet); + mCalled = true; + } + } + } +} |