8c10c403c0
Support for animator to animate SetupWizardLayout horizontally, which requires adding a setXFraction method, changing the translationX with respect to the width of the view. Also moved annotations to com.android.setupwizardlib.annotations package to avoid class loading problems in clients that use support annotation library. Bug: 20110840 Change-Id: Ibfb900323bcf4f32c8ded4c4a6dbf4765f17751a
105 lines
3.2 KiB
Java
105 lines
3.2 KiB
Java
/*
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* Copyright (C) 2015 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.setupwizardlib.view;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.View;
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import android.widget.ScrollView;
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import com.android.setupwizardlib.annotations.VisibleForTesting;
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/**
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* An extension of ScrollView that will invoke a listener callback when the ScrollView needs
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* scrolling, and when the ScrollView is being scrolled to the bottom. This is often used in Setup
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* Wizard as a way to ensure that users see all the content before proceeding.
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*/
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public class BottomScrollView extends ScrollView {
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public interface BottomScrollListener {
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void onScrolledToBottom();
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void onRequiresScroll();
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}
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private BottomScrollListener mListener;
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private int mScrollThreshold;
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private boolean mRequiringScroll = false;
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private final Runnable mCheckScrollRunnable = new Runnable() {
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@Override
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public void run() {
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checkScroll();
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}
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};
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public BottomScrollView(Context context) {
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super(context);
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}
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public BottomScrollView(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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public BottomScrollView(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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}
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public void setBottomScrollListener(BottomScrollListener l) {
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mListener = l;
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}
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@VisibleForTesting
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public int getScrollThreshold() {
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return mScrollThreshold;
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}
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@Override
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protected void onLayout(boolean changed, int l, int t, int r, int b) {
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super.onLayout(changed, l, t, r, b);
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final View child = getChildAt(0);
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if (child != null) {
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mScrollThreshold = Math.max(0, child.getMeasuredHeight() - b + t - getPaddingBottom());
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}
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if (b - t > 0) {
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// Post check scroll in the next run loop, so that the callback methods will be invoked
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// after the layout pass. This way a new layout pass will be scheduled if view
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// properties are changed in the callbacks.
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post(mCheckScrollRunnable);
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}
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}
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@Override
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protected void onScrollChanged(int l, int t, int oldl, int oldt) {
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super.onScrollChanged(l, t, oldl, oldt);
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if (oldt != t) {
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checkScroll();
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}
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}
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private void checkScroll() {
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if (mListener != null) {
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if (getScrollY() >= mScrollThreshold) {
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mListener.onScrolledToBottom();
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} else if (!mRequiringScroll) {
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mRequiringScroll = true;
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mListener.onRequiresScroll();
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}
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}
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}
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}
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