Android example source code file (LinearLayoutWithDefaultTouchRecepient.java)

This example Android source code file (LinearLayoutWithDefaultTouchRecepient.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, attributeset, content, drawing, graphics, linearlayoutwithdefaulttouchrecepient, override, paint, rect, ui, util, view

The LinearLayoutWithDefaultTouchRecepient.java Android example source code

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.internal.widget;

import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
import android.view.MotionEvent;
import android.widget.LinearLayout;


/**
 * Like a normal linear layout, but supports dispatching all otherwise unhandled
 * touch events to a particular descendant.  This is for the unlock screen, so
 * that a wider range of touch events than just the lock pattern widget can kick
 * off a lock pattern if the finger is eventually dragged into the bounds of the
 * lock pattern view.
 */
public class LinearLayoutWithDefaultTouchRecepient extends LinearLayout {

    private final Rect mTempRect = new Rect();
    private View mDefaultTouchRecepient;

    public LinearLayoutWithDefaultTouchRecepient(Context context) {
        super(context);
    }

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

    public void setDefaultTouchRecepient(View defaultTouchRecepient) {
        mDefaultTouchRecepient = defaultTouchRecepient;
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        if (mDefaultTouchRecepient == null) {
            return super.dispatchTouchEvent(ev);
        }

        if (super.dispatchTouchEvent(ev)) {
            return true;
        }
        mTempRect.set(0, 0, 0, 0);
        offsetRectIntoDescendantCoords(mDefaultTouchRecepient, mTempRect);
        ev.setLocation(ev.getX() + mTempRect.left, ev.getY() + mTempRect.top);
        return mDefaultTouchRecepient.dispatchTouchEvent(ev);
    }

}