com.moinut.toolstrip.DragToolLayout.java Source code

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Here is the source code for com.moinut.toolstrip.DragToolLayout.java

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/*
 * ToolStrip library for Android
 * Copyright (c) 2016 MOILING (http://github.com/moiling).
 *
 * 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.moinut.toolstrip;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.support.v4.view.ViewCompat;
import android.support.v4.widget.ViewDragHelper;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;

public class DragToolLayout extends FrameLayout {

    // TODO ??ToolStrip? ToolStrip?????

    private ViewDragHelper mViewDragHelper;
    private ViewDragHelper.Callback callback = new ViewDragHelper.Callback() {
        @Override
        public boolean tryCaptureView(View child, int pointerId) {
            // The ToolStrip can have a ViewGroup, such as CardView.
            if (child instanceof ViewGroup) {
                if (((ViewGroup) child).getChildAt(0) instanceof ToolStrip) {
                    return true;
                }
            }
            // Only ToolStrip can be drag.
            return child instanceof ToolStrip;
        }

        @Override
        public int clampViewPositionHorizontal(View child, int left, int dx) {
            return left;
        }

        @Override
        public int clampViewPositionVertical(View child, int top, int dy) {
            return top;
        }
    };

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return mViewDragHelper.shouldInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        mViewDragHelper.processTouchEvent(event);
        return true;
    }

    @Override
    public void computeScroll() {
        if (mViewDragHelper.continueSettling(true)) {
            ViewCompat.postInvalidateOnAnimation(this);
        }
    }

    public DragToolLayout(Context context) {
        super(context);
        initView(context, null, 0, 0);
    }

    public DragToolLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView(context, attrs, 0, 0);
    }

    public DragToolLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView(context, attrs, defStyleAttr, 0);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public DragToolLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        initView(context, attrs, defStyleAttr, defStyleRes);
    }

    private void initView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        mViewDragHelper = ViewDragHelper.create(this, callback);
    }
}