92 lines
2.7 KiB
Java
92 lines
2.7 KiB
Java
package org.fox.ttrss.util;
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// http://www.techques.com/question/1-9718245/Webview-in-Scrollview
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import android.content.Context;
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import android.graphics.Canvas;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.View;
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import android.webkit.WebView;
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public class TitleWebView extends WebView{
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public TitleWebView(Context context, AttributeSet attrs){
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super(context, attrs);
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}
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private int titleHeight;
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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// determine height of title bar
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View title = getChildAt(0);
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titleHeight = title==null ? 0 : title.getMeasuredHeight();
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}
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@Override
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public boolean onInterceptTouchEvent(MotionEvent ev){
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return true; // don't pass our touch events to children (title bar), we send these in dispatchTouchEvent
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}
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private boolean touchInTitleBar;
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@Override
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public boolean dispatchTouchEvent(MotionEvent me){
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boolean wasInTitle = false;
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switch(me.getActionMasked()){
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case MotionEvent.ACTION_DOWN:
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touchInTitleBar = (me.getY() <= visibleTitleHeight());
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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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wasInTitle = touchInTitleBar;
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touchInTitleBar = false;
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break;
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}
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if(touchInTitleBar || wasInTitle) {
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View title = getChildAt(0);
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if(title!=null) {
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// this touch belongs to title bar, dispatch it here
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me.offsetLocation(0, getScrollY());
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return title.dispatchTouchEvent(me);
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}
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}
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// this is our touch, offset and process
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me.offsetLocation(0, -titleHeight);
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return super.dispatchTouchEvent(me);
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}
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/**
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* @return visible height of title (may return negative values)
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*/
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private int visibleTitleHeight(){
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return titleHeight-getScrollY();
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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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View title = getChildAt(0);
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if(title!=null) // undo horizontal scroll, so that title scrolls only vertically
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title.offsetLeftAndRight(l - title.getLeft());
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}
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@Override
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protected void onDraw(Canvas c){
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c.save();
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int tH = visibleTitleHeight();
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if(tH>0) {
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// clip so that it doesn't clear background under title bar
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int sx = getScrollX(), sy = getScrollY();
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c.clipRect(sx, sy+tH, sx+getWidth(), sy+getHeight());
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}
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c.translate(0, titleHeight);
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super.onDraw(c);
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c.restore();
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}
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}
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