I was toying around with the implementation of the embedded title bar view.
I attached the source code to this post. The "TitleBarWebView" is tested on
Android 2.3 and 4.0.1. I couldn't get my hands on 4.1 yet. The emulator is
simply too slow on my development machine and I have yet to find a
VirtualBox image for it.
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package com.nobu_games.android.view;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
public class TitleBarWebView extends WebView {
private View mTitleBar;
private LayoutParams mTitleBarLayoutParams;
private Matrix mMatrix = new Matrix();
private Rect mClipBounds = new Rect();
public TitleBarWebView(Context context) {
super(context);
}
public TitleBarWebView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public TitleBarWebView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public void setEmbeddedTitleBar(View v) {
if(mTitleBar == v) return;
if(mTitleBar != null) {
removeView(mTitleBar);
}
if(null != v) {
mTitleBarLayoutParams = new LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT, 0, 0);
addView(v, mTitleBarLayoutParams);
setInitialScale(100);
}
mTitleBar = v;
}
@Override
protected void onDraw(Canvas canvas) {
canvas.save();
if(mTitleBar != null) {
final int sy = getScrollY();
final int sx = getScrollX();
mClipBounds.top = sy;
mClipBounds.left = sx;
mClipBounds.right = mClipBounds.left + getWidth();
mClipBounds.bottom = mClipBounds.top + getHeight();
canvas.clipRect(mClipBounds);
mMatrix.set(canvas.getMatrix());
int titleBarOffs = mTitleBar.getHeight() - sy;
if(titleBarOffs < 0) titleBarOffs = 0;
mMatrix.postTranslate(0, titleBarOffs);
canvas.setMatrix(mMatrix);
}
super.onDraw(canvas);
canvas.restore();
}
@Override
protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
if(child == mTitleBar) {
mClipBounds.top = 0;
mClipBounds.left = 0;
mClipBounds.right = mClipBounds.left + child.getWidth();
mClipBounds.bottom = child.getHeight();
canvas.save();
child.setDrawingCacheEnabled(true);
mMatrix.set(canvas.getMatrix());
mMatrix.postTranslate(getScrollX(), -getScrollY());
canvas.setMatrix(mMatrix);
canvas.clipRect(mClipBounds);
child.draw(canvas);
canvas.restore();
return false;
}
return super.drawChild(canvas, child, drawingTime);
}
}
