mirror of https://github.com/moparisthebest/k-9
111 lines
3.6 KiB
Java
111 lines
3.6 KiB
Java
/*
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* Copyright (C) 2011 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.fsck.k9.view;
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import android.content.Context;
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import android.os.Build;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.webkit.WebView;
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import com.fsck.k9.Clock;
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import com.fsck.k9.K9;
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import com.fsck.k9.Throttle;
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import com.fsck.k9.helper.Utility;
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/**
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* A custom WebView that is robust to rapid resize events in sequence.
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*
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* This is useful for a WebView which needs to have a layout of {@code WRAP_CONTENT}, since any
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* contents with percent-based height will force the WebView to infinitely expand (or shrink).
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*/
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public class RigidWebView extends WebView {
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private static final boolean NO_THROTTLE = Build.VERSION.SDK_INT >= 21; //Build.VERSION_CODES.LOLLIPOP
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public RigidWebView(Context context) {
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super(context);
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}
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public RigidWebView(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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public RigidWebView(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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}
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private static final int MIN_RESIZE_INTERVAL = 200;
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private static final int MAX_RESIZE_INTERVAL = 300;
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private final Clock mClock = Clock.INSTANCE;
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private final Throttle mThrottle = new Throttle(getClass().getName(),
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new Runnable() {
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@Override public void run() {
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performSizeChangeDelayed();
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}
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}, Utility.getMainThreadHandler(),
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MIN_RESIZE_INTERVAL, MAX_RESIZE_INTERVAL);
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private int mRealWidth;
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private int mRealHeight;
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private boolean mIgnoreNext;
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private long mLastSizeChangeTime = -1;
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@Override
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protected void onSizeChanged(int w, int h, int ow, int oh) {
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if (NO_THROTTLE) {
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super.onSizeChanged(w, h, ow, oh);
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return;
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}
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mRealWidth = w;
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mRealHeight = h;
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long now = mClock.getTime();
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boolean recentlySized = (now - mLastSizeChangeTime < MIN_RESIZE_INTERVAL);
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// It's known that the previous resize event may cause a resize event immediately. If
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// this happens sufficiently close to the last resize event, drop it on the floor.
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if (mIgnoreNext) {
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mIgnoreNext = false;
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if (recentlySized) {
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if (K9.DEBUG) {
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Log.w(K9.LOG_TAG, "Supressing size change in RigidWebView");
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}
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return;
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}
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}
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if (recentlySized) {
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mThrottle.onEvent();
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} else {
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// It's been a sufficiently long time - just perform the resize as normal. This should
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// be the normal code path.
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performSizeChange(ow, oh);
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}
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}
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private void performSizeChange(int ow, int oh) {
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super.onSizeChanged(mRealWidth, mRealHeight, ow, oh);
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mLastSizeChangeTime = mClock.getTime();
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}
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private void performSizeChangeDelayed() {
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mIgnoreNext = true;
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performSizeChange(getWidth(), getHeight());
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}
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}
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