mirror of
https://github.com/moparisthebest/k-9
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354 lines
11 KiB
Java
354 lines
11 KiB
Java
package com.nobu_games.android.view.web;
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/*
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* Copyright (C) 2012 Thomas Werner
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* Portions Copyright (C) 2006 The Android Open Source Project
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* Portions Copyright (C) 2012 The K-9 Dog Walkers
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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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import java.lang.reflect.Method;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Matrix;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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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.view.MotionEvent;
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import android.view.View;
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import android.view.ViewGroup;
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import android.webkit.WebView;
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import android.webkit.WebViewClassic.TitleBarDelegate;
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import android.widget.FrameLayout;
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/**
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* WebView derivative with custom setEmbeddedTitleBar implementation for Android
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* versions that do not support that feature anymore.
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* <p>
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* <b>Usage</b>
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* <p>
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* Call {@link #setEmbeddedTitleBarCompat(View)} for setting a view as embedded
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* title bar on top of the displayed WebView page.
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*/
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public class TitleBarWebView extends WebView implements TitleBarDelegate {
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/**
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* Internally used view wrapper for suppressing unwanted touch events on the
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* title bar view when WebView contents is being touched.
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*/
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private class TouchBlockView extends FrameLayout {
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public TouchBlockView(Context context) {
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super(context);
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}
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@Override
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public boolean dispatchTouchEvent(MotionEvent ev) {
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if(!mTouchInTitleBar) {
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return false;
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} else {
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switch(ev.getAction() & MotionEvent.ACTION_MASK) {
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case MotionEvent.ACTION_UP:
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case MotionEvent.ACTION_CANCEL:
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mTouchInTitleBar = false;
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break;
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default:
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}
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return super.dispatchTouchEvent(ev);
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}
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}
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}
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private static final String TAG = "TitleBarWebView";
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View mTitleBar;
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int mTitleBarOffs;
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boolean mTouchInTitleBar;
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boolean mTouchMove;
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private Rect mClipBounds = new Rect();
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private Matrix mMatrix = new Matrix();
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private Method mNativeGetVisibleTitleHeightMethod;
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/**
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* This will always contain a reference to the title bar view no matter if
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* {@code setEmbeddedTitleBar()} or the Jelly Bean workaround is used. We use this in
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* {@link #getTitleHeight()}.
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*/
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private View mTitleBarView;
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public TitleBarWebView(Context context) {
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super(context);
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init();
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}
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public TitleBarWebView(Context context, AttributeSet attrs) {
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super(context, attrs);
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init();
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}
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public TitleBarWebView(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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init();
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}
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/**
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* <i>Corrects the visual displacement caused by the title bar view.</i>
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* <p>
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* {@inheritDoc}
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*/
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@Override
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public boolean dispatchTouchEvent(MotionEvent event) {
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if(mTitleBar != null) {
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final int sy = getScrollY();
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final int visTitleHeight = getVisibleTitleHeightCompat();
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final float x = event.getX();
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float y = event.getY();
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switch(event.getAction() & MotionEvent.ACTION_MASK) {
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case MotionEvent.ACTION_DOWN:
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if(y <= visTitleHeight) {
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mTouchInTitleBar = true;
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}
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break;
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case MotionEvent.ACTION_MOVE:
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mTouchMove = true;
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break;
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case MotionEvent.ACTION_UP:
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case MotionEvent.ACTION_CANCEL:
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mTouchMove = false;
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break;
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default:
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}
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if(mTouchInTitleBar) {
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y += sy;
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event.setLocation(x, y);
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return mTitleBar.dispatchTouchEvent(event);
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} else {
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if(Build.VERSION.SDK_INT < 16) {
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if(!mTouchMove) {
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mTitleBarOffs = getVisibleTitleHeightCompat();
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}
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y -= mTitleBarOffs;
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if(y < 0) y = 0;
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event.setLocation(x, y);
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}
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return super.dispatchTouchEvent(event);
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}
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} else {
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return super.dispatchTouchEvent(event);
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}
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}
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/**
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* Sets a {@link View} as an embedded title bar to appear on top of the
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* WebView page.
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* <p>
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* This method tries to call the hidden API method setEmbeddedTitleBar if
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* present. On failure the custom implementation provided by this class will
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* be used instead.
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*
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* @param v The view to set or null for removing the title bar view.
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*/
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public void setEmbeddedTitleBarCompat(View v) {
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try {
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Method nativeMethod = getClass().getMethod("setEmbeddedTitleBar",
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View.class);
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nativeMethod.invoke(this, v);
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} catch(Exception e) {
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Log.d(TAG,
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"Native setEmbeddedTitleBar not available. Starting workaround");
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setEmbeddedTitleBarJellyBean(v);
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}
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mTitleBarView = v;
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}
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@Override
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protected int computeVerticalScrollExtent() {
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if(mTitleBar == null) return super.computeVerticalScrollExtent();
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return getViewHeightWithTitle() - getVisibleTitleHeightCompat();
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}
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@Override
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protected int computeVerticalScrollOffset() {
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if(mTitleBar == null) return super.computeVerticalScrollOffset();
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return Math.max(getScrollY() - getTitleHeight(), 0);
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}
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@Override
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protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
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canvas.save();
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if(child == mTitleBar) {
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mTitleBar.offsetLeftAndRight(getScrollX() - mTitleBar.getLeft());
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if(Build.VERSION.SDK_INT < 16) {
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mMatrix.set(canvas.getMatrix());
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mMatrix.postTranslate(0, -getScrollY());
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canvas.setMatrix(mMatrix);
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}
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}
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boolean result = super.drawChild(canvas, child, drawingTime);
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canvas.restore();
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return result;
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}
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/**
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* Gets the currently visible height of the title bar view if set.
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*
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* @return Visible height of title bar view or 0 if not set.
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*/
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protected int getVisibleTitleHeightCompat() {
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if(mTitleBar == null && mNativeGetVisibleTitleHeightMethod != null) {
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try {
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return (Integer) mNativeGetVisibleTitleHeightMethod
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.invoke(this);
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} catch(Exception e) {
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}
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}
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return Math.max(getTitleHeight() - Math.max(0, getScrollY()), 0);
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}
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@Override
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protected void onDraw(Canvas canvas) {
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if (Build.VERSION.SDK_INT >= 16) {
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super.onDraw(canvas);
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return;
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}
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canvas.save();
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if(mTitleBar != null) {
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final int sy = getScrollY();
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final int sx = getScrollX();
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mClipBounds.top = sy;
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mClipBounds.left = sx;
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mClipBounds.right = mClipBounds.left + getWidth();
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mClipBounds.bottom = mClipBounds.top + getHeight();
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canvas.clipRect(mClipBounds);
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mMatrix.set(canvas.getMatrix());
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int titleBarOffs = getVisibleTitleHeightCompat();
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if(titleBarOffs < 0) titleBarOffs = 0;
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mMatrix.postTranslate(0, titleBarOffs);
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canvas.setMatrix(mMatrix);
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}
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super.onDraw(canvas);
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canvas.restore();
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}
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/**
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* Overrides a hidden method by replicating the behavior of the original
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* WebView class from Android 2.3.4.
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* <p>
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* The worst that could happen is that this method never gets called, which
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* isn't too bad because this does not harm the functionality of this class.
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*/
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protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar,
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int l, int t, int r, int b) {
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int sy = getScrollY();
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if(sy < 0) {
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t -= sy;
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}
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scrollBar.setBounds(l, t + getVisibleTitleHeightCompat(), r, b);
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scrollBar.draw(canvas);
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}
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/**
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* Get the height of the title bar view.
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*
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* <p>
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* In the Jelly Bean workaround we need this method because we have to implement the
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* {@link TitleBarDelegate} interface. But by implementing this method we override the hidden
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* {@code getTitleHeight()} of the {@link WebView}s in older Android versions.
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* <br>
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* What we should do, is return the title height on Jelly Bean and call through to the parent
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* class on older Android versions. But this would require even more trickery, so we just
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* inline the parent functionality which simply calls {@link View#getHeight()}. This is exactly
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* what we do on Jelly Bean anyway.
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* </p>
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*/
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@Override
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public int getTitleHeight() {
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if (mTitleBarView != null) {
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return mTitleBarView.getHeight();
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}
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return 0;
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}
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private int getViewHeightWithTitle() {
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int height = getHeight();
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if(isHorizontalScrollBarEnabled() && !overlayHorizontalScrollbar()) {
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height -= getHorizontalScrollbarHeight();
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}
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return height;
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}
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private void init() {
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try {
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mNativeGetVisibleTitleHeightMethod = WebView.class
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.getDeclaredMethod("getVisibleTitleHeight");
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} catch(NoSuchMethodException e) {
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Log.w(TAG,
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"Could not retrieve native hidden getVisibleTitleHeight method");
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}
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}
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/**
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* The hidden method setEmbeddedTitleBar has been removed from Jelly Bean.
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* This method replicates the functionality.
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*
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* @param v
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*/
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private void setEmbeddedTitleBarJellyBean(View v) {
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if(mTitleBar == v) return;
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if(mTitleBar != null) {
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removeView(mTitleBar);
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}
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if(null != v) {
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LayoutParams vParams = new LayoutParams(
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ViewGroup.LayoutParams.MATCH_PARENT,
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ViewGroup.LayoutParams.WRAP_CONTENT, 0, 0);
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TouchBlockView tbv = new TouchBlockView(getContext());
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FrameLayout.LayoutParams tbvParams = new FrameLayout.LayoutParams(
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LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
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tbv.addView(v, tbvParams);
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addView(tbv, vParams);
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v = tbv;
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}
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mTitleBar = v;
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}
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@Override
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public void onSetEmbeddedTitleBar(View title) { /* unused */ }
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}
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