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CenterZoomLayoutManager.java

20

package com . example . application_job ;

import android . content . Context ;

import android . support . v7 . widget . LinearLayoutManager ;

import android . support . v7 . widget . RecyclerView ;

import android . view . View ;

public class CenterZoomLayoutManager extends LinearLayoutManager {

private final float mShrinkAmount = 0.15f ;

private final float mShrinkDistance = 0.9f ;

public CenterZoomLayoutManager ( Context context ) {

super ( context );

}

public CenterZoomLayoutManager ( Context context , int orientation , boolean reverseLayout ) {

super ( context , orientation , reverseLayout );

}

@ Override

public int scrollVerticallyBy ( int dy , RecyclerView . Recycler recycler , RecyclerView . State state ) {

int orientation = getOrientation ();

if ( orientation == VERTICAL ) {

int scrolled = super . scrollVerticallyBy ( dy , recycler , state );

float midpoint = getHeight () / 2.f ;

float d0 = 0.f ;

float d1 = mShrinkDistance * midpoint ;

float s0 = 1.f ;

float s1 = 1.f - mShrinkAmount ;

for ( int i = 0 ; i < getChildCount (); i ++) {

View child = getChildAt ( i );

float childMidpoint =

( getDecoratedBottom ( child ) + getDecoratedTop ( child )) / 2.f ;

float d = Math . min ( d1 , Math . abs ( midpoint - childMidpoint ));

float scale = s0 + ( s1 - s0 ) * ( d - d0 ) / ( d1 - d0 );

child . setScaleX ( scale );

child . setScaleY ( scale );

}

return scrolled ;

} else {

return 0 ;

}

@ Override

public int scrollHorizontallyBy ( int dx , RecyclerView . Recycler recycler , RecyclerView . State state ) {

int orientation = getOrientation ();

if ( orientation == HORIZONTAL ) {

int scrolled = super . scrollHorizontallyBy ( dx , recycler , state );

float midpoint = getWidth () / 2.f ;

float d0 = 0.f ;

float d1 = mShrinkDistance * midpoint ;

float s0 = 1.f ;

float s1 = 1.f - mShrinkAmount ;

for ( int i = 0 ; i < getChildCount (); i ++) {

View child = getChildAt ( i );

float childMidpoint =

( getDecoratedRight ( child ) + getDecoratedLeft ( child )) / 2.f ;

float d = Math . min ( d1 , Math . abs ( midpoint - childMidpoint ));

float scale = s0 + ( s1 - s0 ) * ( d - d0 ) / ( d1 - d0 );

child . setScaleX ( scale );

child . setScaleY ( scale );

}

return scrolled ;

} else {

return 0 ;

}

CenterZoomLayoutManager.java

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CenterZoomLayoutManager.java

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