JarvisGG/NestedTouchScrollingLayout

:8ball: 处理子 View，父 View 嵌套滚动，成本比 support v4 NestedScrolling 低，放心食用～

NestedTouchScrollingLayout

This layout is used to support dispatch touch event. There has some example gif~

主要用来做 View 的无缝拖拽，详细效果看 gif～

---

Author	Jarvis
E-mail	yang4130qq@gmail.com

---

效果

normal	webview
bottomsheet normal	bottomsheet appbarlayout
webview recyclerview	imageview recyclerview
scene1	scene2

Usage example

normal use

<jarvis.com.library.NestedTouchScrollingLayout
    android:id="@+id/wrapper"
    android:layout_gravity="center"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/container_rv"
        android:layout_width="match_parent"
        android:layout_height="400dp"
        android:background="#fff"
        android:overScrollMode="always">
    </android.support.v7.widget.RecyclerView>

</jarvis.com.library.NestedTouchScrollingLayout>

// 设置手指下拉阻尼
mNestedTouchScrollingLayout.setDampingDown(2.0f / 5);
// 设置手指上拉阻尼
mNestedTouchScrollingLayout.setDampingUp(3.0f / 5);

mNestedTouchScrollingLayout.registerNestScrollChildCallback(new NestedTouchScrollingLayout.INestChildScrollChange() {
        
        // 当前 Layout 偏移距离
	@Override
	public void onNestChildScrollChange(float deltaY, float velocityY) {

	}
	
	// finger 脱离屏幕 Layout 偏移量，以及当前 Layout 的速度
	@Override
	public void onNestChildScrollRelease(final float deltaY, final int velocityY) {
		mNestedTouchScrollingLayout.recover(0, new Runnable() {
			@Override
			public void run() {
				Log.i("NestedTouchScrollingLayout ---> ", "deltaY : " + deltaY + " velocityY : " + velocityY);
			}
		});
	}
	// 手指抬起时机
	@Override
	public void onFingerUp(float velocityY) {

	}

	// 横向拖拽
	@Override
	public void onNestChildHorizationScroll(MotionEvent event, float deltaX, float deltaY) {
	
	}
	
	// 当前 SheetView 运动状态
	@Override
    public void onNestScrollingState(int state) {

    }
});

bottomsheet use

 <jarvis.com.library.NestedTouchScrollingLayout
	android:id="@+id/wrapper"
	android:layout_marginTop="30dp"
	android:layout_width="match_parent"
	android:layout_height="match_parent">

	<android.support.v7.widget.RecyclerView
		android:background="#fff"
		android:id="@+id/container_rv"
		android:layout_width="match_parent"
		android:layout_height="match_parent" />

</jarvis.com.library.NestedTouchScrollingLayout>

// 临界速度，根据业务而定
public static int mVelocityYBound = 1300;

// 规定 sheetView 弹起方向
mNestedTouchScrollingLayout.setSheetDirection(NestedTouchScrollingLayout.SheetDirection.BOTTOM);

mNestedTouchScrollingLayout.registerNestScrollChildCallback(new NestedTouchScrollingLayout.INestChildScrollChange() {
	
	
	@Override
	public void onNestChildScrollChange(float deltaY, float velocityY) {

	}

	@Override
	public void onNestChildScrollRelease(float deltaY, int velocityY) {
		int totalYRange = mNestedTouchScrollingLayout.getMeasuredHeight();
		int helfLimit = (totalYRange - DisplayUtils.dpToPixel(BottomSheetActivity.this, 400)) / 2;
		int hideLimit = totalYRange - DisplayUtils.dpToPixel(BottomSheetActivity.this, 400) / 2;
		int helfHeight = totalYRange - DisplayUtils.dpToPixel(BottomSheetActivity.this, 400);
		if (velocityY > mVelocityYBound && velocityY > 0) {
			if (Math.abs(deltaY) > helfHeight) {
				mNestedTouchScrollingLayout.hiden();
			} else {
				mNestedTouchScrollingLayout.peek(mNestedTouchScrollingLayout.getMeasuredHeight() - DisplayUtils.dpToPixel(BottomSheetActivity.this,400));
			}
		} else if (velocityY < -mVelocityYBound && velocityY < 0) {
			if (Math.abs(deltaY) < helfHeight) {
				mNestedTouchScrollingLayout.expand();
			} else {
				mNestedTouchScrollingLayout.peek(mNestedTouchScrollingLayout.getMeasuredHeight() - DisplayUtils.dpToPixel(BottomSheetActivity.this,400));
			}
		} else {
			if (Math.abs(deltaY) > hideLimit) {
				mNestedTouchScrollingLayout.hiden();
			} else if (Math.abs(deltaY) > helfLimit) {
				mNestedTouchScrollingLayout.peek(mNestedTouchScrollingLayout.getMeasuredHeight() - DisplayUtils.dpToPixel(BottomSheetActivity.this, 400));
			} else {
				mNestedTouchScrollingLayout.expand();
			}
		}
	}

	@Override
	public void onFingerUp(float velocityY) {

	}

	@Override
	public void onNestChildHorizationScroll(MotionEvent event, float deltaX, float deltaY) {

	}
});

Next

• hold all touch event, and dispath touch event to child view.
• fix ACTION_UP dispatch child click event.
• support bottomsheet.
• support CoordinatorLayout (AppbarLayout).
• add damping draging.
• add blur cover.

Usage

方式 1:

repositories {
    // ...
    maven { url "https://jitpack.io" }
}

dependencies {
    implementation 'com.github.JarvisGG:NestedTouchScrollingLayout:1.2.4'
}

方式 2:

repositories {
    // ...
    jcenter()
}
dependencies {
    implementation 'com.jarvis.library.NestedTouchScrollingLayout:library:1.2.4'
}

Tip

star star star ！！！！:blush:

LICENSE

This library is under the MIT license. check the LICENSE file for more detail.

Copyright (c) 2018 Jarvis