The coordinatorlayout.behavior from lodlock

coordinatorlayout.behavior's Introduction

#CoordinatorLayout Snackbar Example This example is to show how to implement a CoordinatorLayout.Behavior on any view element.

Examples are shown via both app:layout_behavior and a custom class that utilizes the behavior.

public class SnackBarBehavior extends CoordinatorLayout.Behavior {
    private float mTranslationY;

    public SnackBarBehavior() {

    }

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

    @Override
    public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
        return dependency instanceof Snackbar.SnackbarLayout;
    }

    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {
        if (dependency instanceof Snackbar.SnackbarLayout) {
            this.updateTranslation(parent, child, dependency);
        }

        return false;
    }

    @Override
    public void onDependentViewRemoved(CoordinatorLayout parent, View child, View dependency) {
        if (dependency instanceof Snackbar.SnackbarLayout) {
            this.updateTranslation(parent, child, dependency);
        }
    }

    private void updateTranslation(CoordinatorLayout parent, View child, View dependency) {
        float translationY = this.getTranslationY(parent, child);
        if (translationY != this.mTranslationY) {
            ViewCompat.animate(child)
                      .cancel();
            if (Math.abs(translationY - this.mTranslationY) == (float) dependency.getHeight()) {
                ViewCompat.animate(child)
                          .translationY(translationY)
                          .setListener((ViewPropertyAnimatorListener) null);
            } else {
                ViewCompat.setTranslationY(child, translationY);
            }

            this.mTranslationY = translationY;
        }

    }

    private float getTranslationY(CoordinatorLayout parent, View child) {
        float minOffset    = 0.0F;
        List  dependencies = parent.getDependencies(child);
        int   i            = 0;

        for (int z = dependencies.size(); i < z; ++i) {
            View view = (View) dependencies.get(i);
            if (view instanceof Snackbar.SnackbarLayout && parent.doViewsOverlap(child, view)) {
                minOffset = Math.min(minOffset, ViewCompat.getTranslationY(view) - (float) view.getHeight());
            }
        }

        return minOffset;
    }
}

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