diff options
Diffstat (limited to 'org.fox.ttrss/src/main/java/org/fox/ttrss/util/TitleWebView.java')
-rw-r--r-- | org.fox.ttrss/src/main/java/org/fox/ttrss/util/TitleWebView.java | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/org.fox.ttrss/src/main/java/org/fox/ttrss/util/TitleWebView.java b/org.fox.ttrss/src/main/java/org/fox/ttrss/util/TitleWebView.java new file mode 100644 index 00000000..4d97918e --- /dev/null +++ b/org.fox.ttrss/src/main/java/org/fox/ttrss/util/TitleWebView.java @@ -0,0 +1,91 @@ +package org.fox.ttrss.util; + +// http://www.techques.com/question/1-9718245/Webview-in-Scrollview + +import android.content.Context; +import android.graphics.Canvas; +import android.util.AttributeSet; +import android.view.MotionEvent; +import android.view.View; +import android.webkit.WebView; + +public class TitleWebView extends WebView{ + + public TitleWebView(Context context, AttributeSet attrs){ + super(context, attrs); + } + + private int titleHeight; + + @Override + protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){ + super.onMeasure(widthMeasureSpec, heightMeasureSpec); + // determine height of title bar + View title = getChildAt(0); + titleHeight = title==null ? 0 : title.getMeasuredHeight(); + } + + @Override + public boolean onInterceptTouchEvent(MotionEvent ev){ + return true; // don't pass our touch events to children (title bar), we send these in dispatchTouchEvent + } + + private boolean touchInTitleBar; + @Override + public boolean dispatchTouchEvent(MotionEvent me){ + + boolean wasInTitle = false; + switch(me.getActionMasked()){ + case MotionEvent.ACTION_DOWN: + touchInTitleBar = (me.getY() <= visibleTitleHeight()); + break; + + case MotionEvent.ACTION_UP: + case MotionEvent.ACTION_CANCEL: + wasInTitle = touchInTitleBar; + touchInTitleBar = false; + break; + } + if(touchInTitleBar || wasInTitle) { + View title = getChildAt(0); + if(title!=null) { + // this touch belongs to title bar, dispatch it here + me.offsetLocation(0, getScrollY()); + return title.dispatchTouchEvent(me); + } + } + // this is our touch, offset and process + me.offsetLocation(0, -titleHeight); + return super.dispatchTouchEvent(me); + } + + /** + * @return visible height of title (may return negative values) + */ + private int visibleTitleHeight(){ + return titleHeight-getScrollY(); + } + + @Override + protected void onScrollChanged(int l, int t, int oldl, int oldt){ + super.onScrollChanged(l, t, oldl, oldt); + View title = getChildAt(0); + if(title!=null) // undo horizontal scroll, so that title scrolls only vertically + title.offsetLeftAndRight(l - title.getLeft()); + } + + @Override + protected void onDraw(Canvas c){ + + c.save(); + int tH = visibleTitleHeight(); + if(tH>0) { + // clip so that it doesn't clear background under title bar + int sx = getScrollX(), sy = getScrollY(); + c.clipRect(sx, sy+tH, sx+getWidth(), sy+getHeight()); + } + c.translate(0, titleHeight); + super.onDraw(c); + c.restore(); + } + } |