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Astyk/ProgressFloatingActionButton.java

Created July 20, 2016 12:13
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  1. Asty created this gist Jul 20, 2016.
    127 changes: 127 additions & 0 deletions ProgressFloatingActionButton.java
    View file
    Original file line number Diff line number Diff line change
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    /*
    * Copyright 2016. Dmitry Malkovich
    *
    * 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.dmitrymalkovich.android;

    import android.content.Context;
    import android.support.design.widget.CoordinatorLayout;
    import android.support.design.widget.FloatingActionButton;
    import android.support.design.widget.Snackbar;
    import android.util.AttributeSet;
    import android.view.Gravity;
    import android.view.View;
    import android.widget.FrameLayout;
    import android.widget.ProgressBar;

    /**
    * ProgressFloatingActionButton.java
    * Created by: Dmitry Malkovich
    * <p/>
    * A circular loader is integrated with a floating action button.
    */
    @CoordinatorLayout.DefaultBehavior(ProgressFloatingActionButton.Behavior.class)
    public class ProgressFloatingActionButton extends FrameLayout {

    private ProgressBar mProgressBar;
    private FloatingActionButton mFab;

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

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    super.onLayout(changed, left, top, right, bottom);

    if (getChildCount() == 0 || getChildCount() > 2) {
    throw new IllegalStateException("Specify only 2 views.");
    }

    for (int i = 0; i < getChildCount(); i++) {
    View view = getChildAt(i);
    if (view instanceof ProgressBar) {
    mProgressBar = (ProgressBar) view;
    } else if (view instanceof FloatingActionButton) {
    mFab = (FloatingActionButton) view;
    } else {
    throw new IllegalStateException("Specify FAB and Progress Bar" +
    "as view's children in your layout.");
    }
    }

    if (mFab == null) {
    throw new IllegalStateException("Floating Action Button not specified");
    } else if (mProgressBar == null) {
    throw new IllegalStateException("Progress Bar not specified");
    }

    LayoutParams mFabParams = ((LayoutParams) mFab.getLayoutParams());
    LayoutParams mProgressParams = ((LayoutParams) mProgressBar.getLayoutParams());

    int additionSize = getResources().getDimensionPixelSize(R.dimen.progress_bar_size);
    mProgressBar.getLayoutParams().height = mFab.getHeight() + additionSize;
    mProgressBar.getLayoutParams().width = mFab.getWidth() + additionSize;

    mFabParams.gravity = Gravity.CENTER;
    mProgressParams.gravity = Gravity.CENTER;
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);

    if (mFab != null && mProgressBar != null) {
    LayoutParams mFabParams = ((LayoutParams) mFab.getLayoutParams());
    LayoutParams mProgressParams = ((LayoutParams) mProgressBar.getLayoutParams());

    int additionSize = getResources().getDimensionPixelSize(R.dimen.progress_bar_size);
    mProgressBar.getLayoutParams().height = mFab.getHeight() + additionSize;
    mProgressBar.getLayoutParams().width = mFab.getWidth() + additionSize;

    mFabParams.gravity = Gravity.CENTER;
    mProgressParams.gravity = Gravity.CENTER;
    }
    }

    /**
    * Created by: Dmitry Malkovich
    * Thanks to https://lab.getbase.com/introduction-to-coordinator-layout-on-android/
    */
    public static class Behavior extends CoordinatorLayout.Behavior<ProgressFloatingActionButton> {
    public Behavior() {
    super();
    }

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

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

    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent,
    ProgressFloatingActionButton child, View dependency) {
    float translationY = Math.min(0, dependency.getTranslationY() - dependency.getHeight());
    if (child.getBottom() > dependency.getTop()) {
    child.setTranslationY(translationY);
    }
    return true;
    }
    }
    }