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Commit 3a59d6e2 authored by Chris Wren's avatar Chris Wren Committed by Android (Google) Code Review
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A layout that switches between its children based on the requested layout height.

Change-Id: I5a4e5892fbed7cab2470e458a38accbbcb05ae51
parent 8334679b
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/*
 * Copyright (C) 2012 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.internal.widget;

import com.android.internal.R;

import android.animation.Animator;
import android.animation.Animator.AnimatorListener;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewDebug;
import android.view.ViewGroup;
import android.widget.RemoteViews.RemoteView;

/**
 * A layout that switches between its children based on the requested layout height.
 * Each child specifies its minimum and maximum valid height.  Results are undefined
 * if children specify overlapping ranges.  A child may specify the maximum height
 * as 'unbounded' to indicate that it is willing to be displayed arbitrarily tall.
 *
 * <p>
 * See {@link SizeAdaptiveLayout.LayoutParams} for a full description of the
 * layout parameters used by SizeAdaptiveLayout.
 */
@RemoteView
public class SizeAdaptiveLayout extends ViewGroup {

    private static final String TAG = "SizeAdaptiveLayout";
    private static final boolean DEBUG = false;
    private static final long CROSSFADE_TIME = 250;

    // TypedArray indices
    private static final int MIN_VALID_HEIGHT =
            R.styleable.SizeAdaptiveLayout_Layout_layout_minHeight;
    private static final int MAX_VALID_HEIGHT =
            R.styleable.SizeAdaptiveLayout_Layout_layout_maxHeight;

    // view state
    private View mActiveChild;
    private View mLastActive;

    // animation state
    private AnimatorSet mTransitionAnimation;
    private AnimatorListener mAnimatorListener;
    private ObjectAnimator mFadePanel;
    private ObjectAnimator mFadeView;
    private int mCanceledAnimationCount;
    private View mEnteringView;
    private View mLeavingView;
    // View used to hide larger views under smaller ones to create a uniform crossfade
    private View mModestyPanel;
    private int mModestyPanelTop;

    public SizeAdaptiveLayout(Context context) {
        super(context);
        initialize();
    }

    public SizeAdaptiveLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        initialize();
    }

    public SizeAdaptiveLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initialize();
    }

    private void initialize() {
        mModestyPanel = new View(getContext());
        // If the SizeAdaptiveLayout has a solid background, use it as a transition hint.
        if (getBackground() instanceof ColorDrawable) {
            mModestyPanel.setBackgroundDrawable(getBackground());
        } else {
            mModestyPanel.setBackgroundColor(Color.BLACK);
        }
        SizeAdaptiveLayout.LayoutParams layout =
                new SizeAdaptiveLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                                                    ViewGroup.LayoutParams.MATCH_PARENT);
        mModestyPanel.setLayoutParams(layout);
        addView(mModestyPanel);
        mFadePanel = ObjectAnimator.ofFloat(mModestyPanel, "alpha", 0f);
        mFadeView = ObjectAnimator.ofFloat(null, "alpha", 0f);
        mAnimatorListener = new BringToFrontOnEnd();
        mTransitionAnimation = new AnimatorSet();
        mTransitionAnimation.play(mFadeView).with(mFadePanel);
        mTransitionAnimation.setDuration(CROSSFADE_TIME);
        mTransitionAnimation.addListener(mAnimatorListener);
    }

    /**
     * Visible for testing
     * @hide
     */
    public Animator getTransitionAnimation() {
        return mTransitionAnimation;
    }

    /**
     * Visible for testing
     * @hide
     */
    public View getModestyPanel() {
        return mModestyPanel;
    }

    @Override
    public void onAttachedToWindow() {
        mLastActive = null;
        // make sure all views start off invisible.
        for (int i = 0; i < getChildCount(); i++) {
            getChildAt(i).setVisibility(View.GONE);
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (DEBUG) Log.d(TAG, this + " measure spec: " +
                         MeasureSpec.toString(heightMeasureSpec));
        View model = selectActiveChild(heightMeasureSpec);
        SizeAdaptiveLayout.LayoutParams lp =
          (SizeAdaptiveLayout.LayoutParams) model.getLayoutParams();
        if (DEBUG) Log.d(TAG, "active min: " + lp.minHeight + " max: " + lp.maxHeight);
        measureChild(model, widthMeasureSpec, heightMeasureSpec);
        int childHeight = model.getMeasuredHeight();
        int childWidth = model.getMeasuredHeight();
        int childState = combineMeasuredStates(0, model.getMeasuredState());
        if (DEBUG) Log.d(TAG, "measured child at: " + childHeight);
        int resolvedWidth = resolveSizeAndState(childWidth, widthMeasureSpec, childState);
        int resolvedheight = resolveSizeAndState(childHeight, heightMeasureSpec, childState);
        setMeasuredDimension(resolvedWidth, resolvedheight);
        if (DEBUG) Log.d(TAG, "resolved to: " + resolvedheight);
    }

    //TODO extend to width and height
    private View selectActiveChild(int heightMeasureSpec) {
        final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        final int heightSize = MeasureSpec.getSize(heightMeasureSpec);

        View unboundedView = null;
        View tallestView = null;
        int tallestViewSize = 0;
        View smallestView = null;
        int smallestViewSize = Integer.MAX_VALUE;
        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);
            if (child != mModestyPanel) {
                SizeAdaptiveLayout.LayoutParams lp =
                    (SizeAdaptiveLayout.LayoutParams) child.getLayoutParams();
                if (DEBUG) Log.d(TAG, "looking at " + i +
                                 " with min: " + lp.minHeight +
                                 " max: " +  lp.maxHeight);
                if (lp.maxHeight == SizeAdaptiveLayout.LayoutParams.UNBOUNDED &&
                    unboundedView == null) {
                    unboundedView = child;
                }
                if (lp.maxHeight > tallestViewSize) {
                    tallestViewSize = lp.maxHeight;
                    tallestView = child;
                }
                if (lp.minHeight < smallestViewSize) {
                    smallestViewSize = lp.minHeight;
                    smallestView = child;
                }
                if (heightMode != MeasureSpec.UNSPECIFIED &&
                    heightSize >= lp.minHeight && heightSize <= lp.maxHeight) {
                    if (DEBUG) Log.d(TAG, "  found exact match, finishing early");
                    return child;
                }
            }
        }
        if (unboundedView != null) {
            tallestView = unboundedView;
        }
        if (heightMode == MeasureSpec.UNSPECIFIED) {
            return tallestView;
        }
        if (heightSize > tallestViewSize) {
            return tallestView;
        }
        return smallestView;
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        if (DEBUG) Log.d(TAG, this + " onlayout height: " + (bottom - top));
        mLastActive = mActiveChild;
        int measureSpec = View.MeasureSpec.makeMeasureSpec(bottom - top,
                                                           View.MeasureSpec.EXACTLY);
        mActiveChild = selectActiveChild(measureSpec);
        mActiveChild.setVisibility(View.VISIBLE);

        if (mLastActive != mActiveChild && mLastActive != null) {
            if (DEBUG) Log.d(TAG, this + " changed children from: " + mLastActive +
                    " to: " + mActiveChild);

            mEnteringView = mActiveChild;
            mLeavingView = mLastActive;

            mEnteringView.setAlpha(1f);

            mModestyPanel.setAlpha(1f);
            mModestyPanel.bringToFront();
            mModestyPanelTop = mLeavingView.getHeight();
            mModestyPanel.setVisibility(View.VISIBLE);
            // TODO: mModestyPanel background should be compatible with mLeavingView

            mLeavingView.bringToFront();

            if (mTransitionAnimation.isRunning()) {
                mTransitionAnimation.cancel();
            }
            mFadeView.setTarget(mLeavingView);
            mFadeView.setFloatValues(0f);
            mFadePanel.setFloatValues(0f);
            mTransitionAnimation.setupStartValues();
            mTransitionAnimation.start();
        }
        final int childWidth = mActiveChild.getMeasuredWidth();
        final int childHeight = mActiveChild.getMeasuredHeight();
        // TODO investigate setting LAYER_TYPE_HARDWARE on mLastActive
        mActiveChild.layout(0, 0, 0 + childWidth, 0 + childHeight);

        if (DEBUG) Log.d(TAG, "got modesty offset of " + mModestyPanelTop);
        mModestyPanel.layout(0, mModestyPanelTop, 0 + childWidth, mModestyPanelTop + childHeight);
    }

    @Override
    public LayoutParams generateLayoutParams(AttributeSet attrs) {
        if (DEBUG) Log.d(TAG, "generate layout from attrs");
        return new SizeAdaptiveLayout.LayoutParams(getContext(), attrs);
    }

    @Override
    protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
        if (DEBUG) Log.d(TAG, "generate default layout from viewgroup");
        return new SizeAdaptiveLayout.LayoutParams(p);
    }

    @Override
    protected LayoutParams generateDefaultLayoutParams() {
        if (DEBUG) Log.d(TAG, "generate default layout from null");
        return new SizeAdaptiveLayout.LayoutParams();
    }

    @Override
    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
        return p instanceof SizeAdaptiveLayout.LayoutParams;
    }

    /**
     * Per-child layout information associated with ViewSizeAdaptiveLayout.
     *
     * TODO extend to width and height
     *
     * @attr ref android.R.styleable#SizeAdaptiveLayout_Layout_layout_minHeight
     * @attr ref android.R.styleable#SizeAdaptiveLayout_Layout_layout_maxHeight
     */
    public static class LayoutParams extends ViewGroup.LayoutParams {

        /**
         * Indicates the minimum valid height for the child.
         */
        @ViewDebug.ExportedProperty(category = "layout")
        public int minHeight;

        /**
         * Indicates the maximum valid height for the child.
         */
        @ViewDebug.ExportedProperty(category = "layout")
        public int maxHeight;

        /**
         * Constant value for maxHeight that indicates there is not maximum height.
         */
        public static final int UNBOUNDED = -1;

        /**
         * {@inheritDoc}
         */
        public LayoutParams(Context c, AttributeSet attrs) {
            super(c, attrs);
            if (DEBUG) {
                Log.d(TAG, "construct layout from attrs");
                for (int i = 0; i < attrs.getAttributeCount(); i++) {
                    Log.d(TAG, " " + attrs.getAttributeName(i) + " = " +
                          attrs.getAttributeValue(i));
                }
            }
            TypedArray a =
                    c.obtainStyledAttributes(attrs,
                            R.styleable.SizeAdaptiveLayout_Layout);

            minHeight = a.getDimensionPixelSize(MIN_VALID_HEIGHT, 0);
            if (DEBUG) Log.d(TAG, "got minHeight of: " + minHeight);

            try {
                maxHeight = a.getLayoutDimension(MAX_VALID_HEIGHT, UNBOUNDED);
                if (DEBUG) Log.d(TAG, "got maxHeight of: " + maxHeight);
            } catch (Exception e) {
                if (DEBUG) Log.d(TAG, "caught exception looking for maxValidHeight " + e);
            }

            a.recycle();
        }

        /**
         * Creates a new set of layout parameters with the specified width, height
         * and valid height bounds.
         *
         * @param width the width, either {@link #MATCH_PARENT},
         *        {@link #WRAP_CONTENT} or a fixed size in pixels
         * @param height the height, either {@link #MATCH_PARENT},
         *        {@link #WRAP_CONTENT} or a fixed size in pixels
         * @param minHeight the minimum height of this child
         * @param maxHeight the maximum height of this child
         *        or {@link #UNBOUNDED} if the child can grow forever
         */
        public LayoutParams(int width, int height, int minHeight, int maxHeight) {
            super(width, height);
            this.minHeight = minHeight;
            this.maxHeight = maxHeight;
        }

        /**
         * {@inheritDoc}
         */
        public LayoutParams(int width, int height) {
            this(width, height, UNBOUNDED, UNBOUNDED);
        }

        /**
         * Constructs a new LayoutParams with default values as defined in {@link LayoutParams}.
         */
        public LayoutParams() {
            this(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
        }

        /**
         * {@inheritDoc}
         */
        public LayoutParams(ViewGroup.LayoutParams p) {
            super(p);
            minHeight = UNBOUNDED;
            maxHeight = UNBOUNDED;
        }

        public String debug(String output) {
            return output + "SizeAdaptiveLayout.LayoutParams={" +
                    ", max=" + maxHeight +
                    ", max=" + minHeight + "}";
        }
    }

    class BringToFrontOnEnd implements AnimatorListener {
        @Override
            public void onAnimationEnd(Animator animation) {
            if (mCanceledAnimationCount == 0) {
                mLeavingView.setVisibility(View.GONE);
                mModestyPanel.setVisibility(View.GONE);
                mEnteringView.bringToFront();
                mEnteringView = null;
                mLeavingView = null;
            } else {
                mCanceledAnimationCount--;
            }
        }

        @Override
            public void onAnimationCancel(Animator animation) {
            mCanceledAnimationCount++;
        }

        @Override
            public void onAnimationRepeat(Animator animation) {
            if (DEBUG) Log.d(TAG, "fade animation repeated: should never happen.");
            assert(false);
        }

        @Override
            public void onAnimationStart(Animator animation) {
        }
    }
}
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@@ -5379,6 +5379,21 @@
        <attr name="horizontalOffset" format="dimension" />
    </declare-styleable>

    <!-- =============================== -->
    <!-- SizeAdaptiveLayout class attributes -->
    <!-- =============================== -->
    <eat-comment />
    <declare-styleable name="SizeAdaptiveLayout_Layout">
      <!-- The maximum valid height for this item. -->
      <attr name="layout_maxHeight" format="dimension">
        <!-- Indicates that the view may be resized arbitrarily large. -->
        <enum name="unbounded" value="-1" />
      </attr>
      <!-- The minimum valid height for this item. -->
      <attr name="layout_minHeight" format="dimension" />
    </declare-styleable>
    <declare-styleable name="SizeAdaptiveLayout" />

    <!-- =============================== -->
    <!-- LockPatternView class attributes -->
    <!-- =============================== -->
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<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2012 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.
-->
<com.android.internal.widget.SizeAdaptiveLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:internal="http://schemas.android.com/apk/prv/res/android"
    android:id="@+id/multi1"
    android:layout_width="match_parent"
    android:layout_height="64dp" >

    <include
        android:id="@+id/one_u"
        layout="@layout/size_adaptive_one_u"
        android:layout_width="fill_parent"
        android:layout_height="64dp"
        internal:layout_minHeight="64dp"
        internal:layout_maxHeight="64dp"
        />

    <include
        android:id="@+id/four_u"
        layout="@layout/size_adaptive_four_u"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        internal:layout_minHeight="65dp"
        internal:layout_maxHeight="unbounded"/>

</com.android.internal.widget.SizeAdaptiveLayout>
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