Forked from NikolaDespotoski/ToolbarElevationOffsetListener.java
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October 14, 2024 08:33
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| package productmeister.com.productmeister.view; | |
| import android.annotation.TargetApi; | |
| import android.os.Build; | |
| import android.support.design.widget.AppBarLayout; | |
| import android.support.v4.view.ViewCompat; | |
| import android.support.v7.app.ActionBar; | |
| import android.support.v7.app.AppCompatActivity; | |
| import android.support.v7.widget.Toolbar; | |
| /** | |
| * Created by Nikola D. on 11/11/2015. | |
| */ | |
| public class ToolbarElevationOffsetListener implements AppBarLayout.OnOffsetChangedListener { | |
| private final Toolbar mToolbar; | |
| private float mTargetElevation; | |
| private final AppCompatActivity mActivity; | |
| public ToolbarElevationOffsetListener(AppCompatActivity appCompatActivity, Toolbar toolbar) { | |
| mActivity = appCompatActivity; | |
| mToolbar = toolbar; | |
| mTargetElevation = mToolbar.getContext().getResources().getDimension(R.dimen.appbar_elevation); | |
| } | |
| @TargetApi(Build.VERSION_CODES.LOLLIPOP) | |
| @Override | |
| public void onOffsetChanged(AppBarLayout appBarLayout, int offset) { | |
| offset = Math.abs(offset); | |
| mTargetElevation = Math.max(mTargetElevation, appBarLayout.getTargetElevation()); | |
| if (offset >= appBarLayout.getTotalScrollRange() - mToolbar.getHeight()) { | |
| float flexibleSpace = appBarLayout.getTotalScrollRange() - offset; | |
| float ratio = 1 - (flexibleSpace / mToolbar.getHeight()); | |
| float elevation = ratio * mTargetElevation; | |
| setToolbarElevation(elevation); | |
| } else { | |
| setToolbarElevation(0); | |
| } | |
| } | |
| private void setToolbarElevation(float targetElevation) { | |
| ActionBar supportActionBar = mActivity.getSupportActionBar(); | |
| if (supportActionBar != null) supportActionBar.setElevation(targetElevation); | |
| else if (mToolbar != null) | |
| ViewCompat.setElevation(mToolbar, targetElevation); | |
| } | |
| } |
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