xref: /external/setupdesign/main/src/com/google/android/setupdesign/view/NavigationBarButton.java

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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.google.android.setupdesign.view;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.ColorStateList;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.Button;
import androidx.annotation.NonNull;

/**
 * Button for navigation bar, which includes tinting of its compound drawables to be used for dark
 * and light themes.
 */
@SuppressLint("AppCompatCustomView")
public class NavigationBarButton extends Button {

  public NavigationBarButton(Context context) {
    super(context);
    init();
  }

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

  private void init() {
    if (isInEditMode()) {
      return;
    }

    // Unfortunately, drawableStart and drawableEnd set through XML does not call the setter,
    // so manually getting it and wrapping it in the compat drawable.
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
      Drawable[] drawables = getCompoundDrawablesRelative();
      for (int i = 0; i < drawables.length; i++) {
        if (drawables[i] != null) {
          drawables[i] = TintedDrawable.wrap(drawables[i]);
        }
      }
      setCompoundDrawablesRelativeWithIntrinsicBounds(
          drawables[0], drawables[1], drawables[2], drawables[3]);
    }
  }

  @Override
  public void setCompoundDrawables(Drawable left, Drawable top, Drawable right, Drawable bottom) {
    if (left != null) {
      left = TintedDrawable.wrap(left);
    }
    if (top != null) {
      top = TintedDrawable.wrap(top);
    }
    if (right != null) {
      right = TintedDrawable.wrap(right);
    }
    if (bottom != null) {
      bottom = TintedDrawable.wrap(bottom);
    }
    super.setCompoundDrawables(left, top, right, bottom);
    tintDrawables();
  }

  @Override
  public void setCompoundDrawablesRelative(
      Drawable start, Drawable top, Drawable end, Drawable bottom) {
    if (start != null) {
      start = TintedDrawable.wrap(start);
    }
    if (top != null) {
      top = TintedDrawable.wrap(top);
    }
    if (end != null) {
      end = TintedDrawable.wrap(end);
    }
    if (bottom != null) {
      bottom = TintedDrawable.wrap(bottom);
    }
    super.setCompoundDrawablesRelative(start, top, end, bottom);
    tintDrawables();
  }

  @Override
  public void setTextColor(ColorStateList colors) {
    super.setTextColor(colors);
    tintDrawables();
  }

  private void tintDrawables() {
    final ColorStateList textColors = getTextColors();
    if (textColors != null) {
      for (Drawable drawable : getAllCompoundDrawables()) {
        if (drawable instanceof TintedDrawable) {
          ((TintedDrawable) drawable).setTintListCompat(textColors);
        }
      }
      invalidate();
    }
  }

  private Drawable[] getAllCompoundDrawables() {
    Drawable[] drawables = new Drawable[6];
    Drawable[] compoundDrawables = getCompoundDrawables();
    drawables[0] = compoundDrawables[0]; // left
    drawables[1] = compoundDrawables[1]; // top
    drawables[2] = compoundDrawables[2]; // right
    drawables[3] = compoundDrawables[3]; // bottom
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
      Drawable[] compoundDrawablesRelative = getCompoundDrawablesRelative();
      drawables[4] = compoundDrawablesRelative[0]; // start
      drawables[5] = compoundDrawablesRelative[2]; // end
    }
    return drawables;
  }

  // TODO: Remove this class and use DrawableCompat.wrap() once we can use support library 22.1.0
  // or above
  private static class TintedDrawable extends LayerDrawable {

    public static TintedDrawable wrap(Drawable drawable) {
      if (drawable instanceof TintedDrawable) {
        return (TintedDrawable) drawable;
      }
      return new TintedDrawable(drawable.mutate());
    }

    private ColorStateList tintList = null;

    TintedDrawable(Drawable wrapped) {
      super(new Drawable[] {wrapped});
    }

    @Override
    public boolean isStateful() {
      return true;
    }

    @Override
    public boolean setState(@NonNull int[] stateSet) {
      boolean needsInvalidate = super.setState(stateSet);
      boolean needsInvalidateForState = updateState();
      return needsInvalidate || needsInvalidateForState;
    }

    public void setTintListCompat(ColorStateList colors) {
      tintList = colors;
      if (updateState()) {
        invalidateSelf();
      }
    }

    private boolean updateState() {
      if (tintList != null) {
        final int color = tintList.getColorForState(getState(), 0);
        setColorFilter(color, PorterDuff.Mode.SRC_IN);
        return true; // Needs invalidate
      }
      return false;
    }
  }
}