7a1a406b24
Also switch to Slog, which is more appropriate for framework logging. Bug: 6684167 Change-Id: I829de86702a9952ce42ec9967c8d493529253426
375 lines
15 KiB
Java
375 lines
15 KiB
Java
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.systemui;
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import android.animation.Animator;
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import android.animation.AnimatorListenerAdapter;
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import android.animation.AnimatorSet;
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import android.animation.ObjectAnimator;
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import android.content.Context;
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import android.util.Slog;
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import android.view.Gravity;
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import android.view.MotionEvent;
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import android.view.ScaleGestureDetector;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.View.OnClickListener;
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public class ExpandHelper implements Gefingerpoken, OnClickListener {
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public interface Callback {
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View getChildAtRawPosition(float x, float y);
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View getChildAtPosition(float x, float y);
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boolean canChildBeExpanded(View v);
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boolean setUserExpandedChild(View v, boolean userxpanded);
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}
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private static final String TAG = "ExpandHelper";
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protected static final boolean DEBUG = false;
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private static final long EXPAND_DURATION = 250;
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private static final long GLOW_DURATION = 150;
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// Set to false to disable focus-based gestures (two-finger pull).
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private static final boolean USE_DRAG = true;
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// Set to false to disable scale-based gestures (both horizontal and vertical).
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private static final boolean USE_SPAN = true;
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// Both gestures types may be active at the same time.
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// At least one gesture type should be active.
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// A variant of the screwdriver gesture will emerge from either gesture type.
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// amount of overstretch for maximum brightness expressed in U
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// 2f: maximum brightness is stretching a 1U to 3U, or a 4U to 6U
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private static final float STRETCH_INTERVAL = 2f;
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// level of glow for a touch, without overstretch
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// overstretch fills the range (GLOW_BASE, 1.0]
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private static final float GLOW_BASE = 0.5f;
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@SuppressWarnings("unused")
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private Context mContext;
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private boolean mStretching;
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private View mEventSource;
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private View mCurrView;
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private View mCurrViewTopGlow;
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private View mCurrViewBottomGlow;
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private float mOldHeight;
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private float mNaturalHeight;
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private float mInitialTouchFocusY;
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private float mInitialTouchSpan;
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private Callback mCallback;
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private ScaleGestureDetector mDetector;
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private ViewScaler mScaler;
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private ObjectAnimator mScaleAnimation;
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private AnimatorSet mGlowAnimationSet;
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private ObjectAnimator mGlowTopAnimation;
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private ObjectAnimator mGlowBottomAnimation;
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private int mSmallSize;
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private int mLargeSize;
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private float mMaximumStretch;
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private int mGravity;
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private class ViewScaler {
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View mView;
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public ViewScaler() {}
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public void setView(View v) {
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mView = v;
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}
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public void setHeight(float h) {
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if (DEBUG) Slog.v(TAG, "SetHeight: setting to " + h);
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ViewGroup.LayoutParams lp = mView.getLayoutParams();
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lp.height = (int)h;
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mView.setLayoutParams(lp);
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mView.requestLayout();
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}
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public float getHeight() {
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int height = mView.getLayoutParams().height;
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if (height < 0) {
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height = mView.getMeasuredHeight();
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}
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return (float) height;
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}
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public int getNaturalHeight(int maximum) {
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ViewGroup.LayoutParams lp = mView.getLayoutParams();
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if (DEBUG) Slog.v(TAG, "Inspecting a child of type: " + mView.getClass().getName());
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int oldHeight = lp.height;
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lp.height = ViewGroup.LayoutParams.WRAP_CONTENT;
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mView.setLayoutParams(lp);
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mView.measure(
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View.MeasureSpec.makeMeasureSpec(mView.getMeasuredWidth(),
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View.MeasureSpec.EXACTLY),
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View.MeasureSpec.makeMeasureSpec(maximum,
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View.MeasureSpec.AT_MOST));
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lp.height = oldHeight;
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mView.setLayoutParams(lp);
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return mView.getMeasuredHeight();
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}
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}
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/**
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* Handle expansion gestures to expand and contract children of the callback.
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*
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* @param context application context
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* @param callback the container that holds the items to be manipulated
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* @param small the smallest allowable size for the manuipulated items.
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* @param large the largest allowable size for the manuipulated items.
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* @param scoller if non-null also manipulate the scroll position to obey the gravity.
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*/
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public ExpandHelper(Context context, Callback callback, int small, int large) {
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mSmallSize = small;
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mMaximumStretch = mSmallSize * STRETCH_INTERVAL;
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mLargeSize = large;
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mContext = context;
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mCallback = callback;
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mScaler = new ViewScaler();
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mGravity = Gravity.TOP;
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mScaleAnimation = ObjectAnimator.ofFloat(mScaler, "height", 0f);
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mScaleAnimation.setDuration(EXPAND_DURATION);
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AnimatorListenerAdapter glowVisibilityController = new AnimatorListenerAdapter() {
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@Override
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public void onAnimationStart(Animator animation) {
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View target = (View) ((ObjectAnimator) animation).getTarget();
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if (target.getAlpha() <= 0.0f) {
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target.setVisibility(View.VISIBLE);
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}
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}
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@Override
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public void onAnimationEnd(Animator animation) {
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View target = (View) ((ObjectAnimator) animation).getTarget();
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if (target.getAlpha() <= 0.0f) {
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target.setVisibility(View.INVISIBLE);
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}
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}
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};
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mGlowTopAnimation = ObjectAnimator.ofFloat(null, "alpha", 0f);
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mGlowTopAnimation.addListener(glowVisibilityController);
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mGlowBottomAnimation = ObjectAnimator.ofFloat(null, "alpha", 0f);
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mGlowBottomAnimation.addListener(glowVisibilityController);
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mGlowAnimationSet = new AnimatorSet();
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mGlowAnimationSet.play(mGlowTopAnimation).with(mGlowBottomAnimation);
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mGlowAnimationSet.setDuration(GLOW_DURATION);
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mDetector =
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new ScaleGestureDetector(context,
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new ScaleGestureDetector.SimpleOnScaleGestureListener() {
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@Override
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public boolean onScaleBegin(ScaleGestureDetector detector) {
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if (DEBUG) Slog.v(TAG, "onscalebegin()");
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float x = detector.getFocusX();
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float y = detector.getFocusY();
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View v = null;
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if (mEventSource != null) {
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int[] location = new int[2];
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mEventSource.getLocationOnScreen(location);
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x += (float) location[0];
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y += (float) location[1];
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v = mCallback.getChildAtRawPosition(x, y);
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} else {
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v = mCallback.getChildAtPosition(x, y);
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}
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// your fingers have to be somewhat close to the bounds of the view in question
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mInitialTouchFocusY = detector.getFocusY();
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mInitialTouchSpan = Math.abs(detector.getCurrentSpan());
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if (DEBUG) Slog.d(TAG, "got mInitialTouchSpan: (" + mInitialTouchSpan + ")");
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mStretching = initScale(v);
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return mStretching;
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}
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@Override
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public boolean onScale(ScaleGestureDetector detector) {
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if (DEBUG) Slog.v(TAG, "onscale() on " + mCurrView);
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// are we scaling or dragging?
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float span = Math.abs(detector.getCurrentSpan()) - mInitialTouchSpan;
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span *= USE_SPAN ? 1f : 0f;
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float drag = detector.getFocusY() - mInitialTouchFocusY;
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drag *= USE_DRAG ? 1f : 0f;
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drag *= mGravity == Gravity.BOTTOM ? -1f : 1f;
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float pull = Math.abs(drag) + Math.abs(span) + 1f;
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float hand = drag * Math.abs(drag) / pull + span * Math.abs(span) / pull;
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if (DEBUG) Slog.d(TAG, "current span handle is: " + hand);
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hand = hand + mOldHeight;
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float target = hand;
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if (DEBUG) Slog.d(TAG, "target is: " + target);
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hand = hand < mSmallSize ? mSmallSize : (hand > mLargeSize ? mLargeSize : hand);
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hand = hand > mNaturalHeight ? mNaturalHeight : hand;
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if (DEBUG) Slog.d(TAG, "scale continues: hand =" + hand);
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mScaler.setHeight(hand);
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// glow if overscale
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float stretch = (float) Math.abs((target - hand) / mMaximumStretch);
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float strength = 1f / (1f + (float) Math.pow(Math.E, -1 * ((8f * stretch) - 5f)));
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if (DEBUG) Slog.d(TAG, "stretch: " + stretch + " strength: " + strength);
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setGlow(GLOW_BASE + strength * (1f - GLOW_BASE));
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return true;
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}
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@Override
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public void onScaleEnd(ScaleGestureDetector detector) {
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if (DEBUG) Slog.v(TAG, "onscaleend()");
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// I guess we're alone now
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if (DEBUG) Slog.d(TAG, "scale end");
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finishScale(false);
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}
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});
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}
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public void setEventSource(View eventSource) {
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mEventSource = eventSource;
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}
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public void setGravity(int gravity) {
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mGravity = gravity;
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}
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public void setGlow(float glow) {
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if (!mGlowAnimationSet.isRunning() || glow == 0f) {
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if (mGlowAnimationSet.isRunning()) {
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mGlowAnimationSet.cancel();
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}
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if (mCurrViewTopGlow != null && mCurrViewBottomGlow != null) {
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if (glow == 0f || mCurrViewTopGlow.getAlpha() == 0f) {
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// animate glow in and out
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mGlowTopAnimation.setTarget(mCurrViewTopGlow);
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mGlowBottomAnimation.setTarget(mCurrViewBottomGlow);
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mGlowTopAnimation.setFloatValues(glow);
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mGlowBottomAnimation.setFloatValues(glow);
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mGlowAnimationSet.setupStartValues();
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mGlowAnimationSet.start();
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} else {
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// set it explicitly in reponse to touches.
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mCurrViewTopGlow.setAlpha(glow);
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mCurrViewBottomGlow.setAlpha(glow);
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handleGlowVisibility();
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}
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}
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}
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}
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private void handleGlowVisibility() {
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mCurrViewTopGlow.setVisibility(mCurrViewTopGlow.getAlpha() <= 0.0f ?
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View.INVISIBLE : View.VISIBLE);
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mCurrViewBottomGlow.setVisibility(mCurrViewBottomGlow.getAlpha() <= 0.0f ?
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View.INVISIBLE : View.VISIBLE);
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}
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public boolean onInterceptTouchEvent(MotionEvent ev) {
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if (DEBUG) Slog.d(TAG, "interceptTouch: act=" + (ev.getAction()) +
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" stretching=" + mStretching);
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mDetector.onTouchEvent(ev);
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return mStretching;
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}
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public boolean onTouchEvent(MotionEvent ev) {
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final int action = ev.getAction();
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if (DEBUG) Slog.d(TAG, "touch: act=" + (action) + " stretching=" + mStretching);
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if (mStretching) {
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if (DEBUG) Slog.d(TAG, "detector ontouch");
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mDetector.onTouchEvent(ev);
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}
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switch (action) {
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case MotionEvent.ACTION_UP:
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case MotionEvent.ACTION_CANCEL:
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if (DEBUG) Slog.d(TAG, "cancel");
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mStretching = false;
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clearView();
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break;
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}
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return true;
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}
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private boolean initScale(View v) {
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if (v != null) {
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if (DEBUG) Slog.d(TAG, "scale begins on view: " + v);
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mStretching = true;
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setView(v);
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setGlow(GLOW_BASE);
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mScaler.setView(v);
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mOldHeight = mScaler.getHeight();
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if (mCallback.canChildBeExpanded(v)) {
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if (DEBUG) Slog.d(TAG, "working on an expandable child");
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mNaturalHeight = mScaler.getNaturalHeight(mLargeSize);
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} else {
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if (DEBUG) Slog.d(TAG, "working on a non-expandable child");
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mNaturalHeight = mOldHeight;
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}
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if (DEBUG) Slog.d(TAG, "got mOldHeight: " + mOldHeight +
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" mNaturalHeight: " + mNaturalHeight);
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v.getParent().requestDisallowInterceptTouchEvent(true);
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}
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return mStretching;
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}
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private void finishScale(boolean force) {
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float h = mScaler.getHeight();
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final boolean wasClosed = (mOldHeight == mSmallSize);
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if (wasClosed) {
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h = (force || h > mSmallSize) ? mNaturalHeight : mSmallSize;
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} else {
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h = (force || h < mNaturalHeight) ? mSmallSize : mNaturalHeight;
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}
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if (DEBUG && mCurrView != null) mCurrView.setBackgroundColor(0);
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if (mScaleAnimation.isRunning()) {
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mScaleAnimation.cancel();
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}
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mScaleAnimation.setFloatValues(h);
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mScaleAnimation.setupStartValues();
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mScaleAnimation.start();
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mStretching = false;
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setGlow(0f);
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mCallback.setUserExpandedChild(mCurrView, h == mNaturalHeight);
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if (DEBUG) Slog.d(TAG, "scale was finished on view: " + mCurrView);
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clearView();
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}
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private void clearView() {
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mCurrView = null;
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mCurrViewTopGlow = null;
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mCurrViewBottomGlow = null;
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}
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private void setView(View v) {
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mCurrView = v;
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if (v instanceof ViewGroup) {
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ViewGroup g = (ViewGroup) v;
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mCurrViewTopGlow = g.findViewById(R.id.top_glow);
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mCurrViewBottomGlow = g.findViewById(R.id.bottom_glow);
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if (DEBUG) {
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String debugLog = "Looking for glows: " +
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(mCurrViewTopGlow != null ? "found top " : "didn't find top") +
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(mCurrViewBottomGlow != null ? "found bottom " : "didn't find bottom");
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Slog.v(TAG, debugLog);
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}
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}
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}
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@Override
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public void onClick(View v) {
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initScale(v);
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finishScale(true);
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}
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}
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