services/java/com/android/server/status/StatusBarView.java

package com.android.server.status;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.FrameLayout;

import com.android.internal.R;

public class StatusBarView extends FrameLayout {
    private static final String TAG = "StatusBarView";

    StatusBarService mService;
    boolean mTracking;
    int mStartX, mStartY;
    ViewGroup mNotificationIcons;
    ViewGroup mStatusIcons;
    View mDate;
    FixedSizeDrawable mBackground;

    public StatusBarView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        mNotificationIcons = (ViewGroup)findViewById(R.id.notificationIcons);
        mStatusIcons = (ViewGroup)findViewById(R.id.statusIcons);
        mDate = findViewById(R.id.date);

        mBackground = new FixedSizeDrawable(mDate.getBackground());
        mBackground.setFixedBounds(0, 0, 0, 0);
        mDate.setBackgroundDrawable(mBackground);
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        mService.onBarViewAttached();
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mService.updateExpandedViewPos(StatusBarService.EXPANDED_LEAVE_ALONE);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);

        // put the date date view quantized to the icons
        int oldDateRight = mDate.getRight();
        int newDateRight;

        newDateRight = getDateSize(mNotificationIcons, oldDateRight,
                getViewOffset(mNotificationIcons));
        if (newDateRight < 0) {
            int offset = getViewOffset(mStatusIcons);
            if (oldDateRight < offset) {
                newDateRight = oldDateRight;
            } else {
                newDateRight = getDateSize(mStatusIcons, oldDateRight, offset);
                if (newDateRight < 0) {
                    newDateRight = r;
                }
            }
        }
        int max = r - getPaddingRight();
        if (newDateRight > max) {
            newDateRight = max;
        }

        mDate.layout(mDate.getLeft(), mDate.getTop(), newDateRight, mDate.getBottom());
        mBackground.setFixedBounds(-mDate.getLeft(), -mDate.getTop(), (r-l), (b-t));
    }

    /**
     * Gets the left position of v in this view.  Throws if v is not
     * a child of this.
     */
    private int getViewOffset(View v) {
        int offset = 0;
        while (v != this) {
            offset += v.getLeft();
            ViewParent p = v.getParent();
            if (v instanceof View) {
                v = (View)p;
            } else {
                throw new RuntimeException(v + " is not a child of " + this);
            }
        }
        return offset;
    }

    private int getDateSize(ViewGroup g, int w, int offset) {
        final int N = g.getChildCount();
        for (int i=0; i<N; i++) {
            View v = g.getChildAt(i);
            int l = v.getLeft() + offset;
            int r = v.getRight() + offset;
            if (w >= l && w <= r) {
                return r;
            }
        }
        return -1;
    }

    /**
     * Ensure that, if there is no target under us to receive the touch,
     * that we process it ourself.  This makes sure that onInterceptTouchEvent()
     * is always called for the entire gesture.
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() != MotionEvent.ACTION_DOWN) {
            mService.interceptTouchEvent(event);
        }
        return true;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        return mService.interceptTouchEvent(event)
                ? true : super.onInterceptTouchEvent(event);
    }
}