material-components_material-components-android/lib/java/com/google/android/material/picker/CalendarItemStyle.java

/*
 * Copyright 2019 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.material.picker;

import com.google.android.material.R;

import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.InsetDrawable;
import android.graphics.drawable.RippleDrawable;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import androidx.annotation.StyleRes;
import com.google.android.material.resources.MaterialResources;
import com.google.android.material.shape.MaterialShapeDrawable;
import com.google.android.material.shape.ShapeAppearanceModel;
import androidx.core.util.Preconditions;
import androidx.core.view.ViewCompat;
import android.widget.TextView;

/**
 * Loads and applies {@link R.styleable#MaterialCalendarDay} attributes to {@link TextView}
 * instances.
 */
final class CalendarItemStyle {

  private final ColorStateList textColor;
  private final MaterialShapeDrawable backgroundDrawable;
  private final MaterialShapeDrawable shapeMask;

  /**
   * The padding between the View horizontal edge and the selection marker.
   *
   * <p>The selection marker's size is defined by {@code
   * R.dimen.mtrl_calendar_day_selection_corner}.
   */
  final int horizontalPadding;
  /**
   * The padding between the View vertical edge and the selection marker.
   *
   * <p>The selection marker's size is defined by {@code
   * R.dimen.mtrl_calendar_day_selection_corner}.
   */
  final int verticalPadding;

  private CalendarItemStyle(
      ColorStateList backgroundColor,
      ColorStateList textColor,
      ColorStateList strokeColor,
      int strokeWidth,
      ShapeAppearanceModel itemShape,
      int horizontalPadding,
      int verticalPadding) {
    Preconditions.checkArgumentNonnegative(horizontalPadding);
    Preconditions.checkArgumentNonnegative(verticalPadding);

    this.textColor = textColor;
    backgroundDrawable = new MaterialShapeDrawable();
    shapeMask = new MaterialShapeDrawable();
    backgroundDrawable.setShapeAppearanceModel(itemShape);
    shapeMask.setShapeAppearanceModel(itemShape);
    backgroundDrawable.setFillColor(backgroundColor);
    backgroundDrawable.setStroke(strokeWidth, strokeColor);
    this.horizontalPadding = horizontalPadding;
    this.verticalPadding = verticalPadding;
  }

  /**
   * Creates a {@link CalendarItemStyle} using the provided {@link R.styleable#MaterialCalendarDay}.
   */
  static CalendarItemStyle create(Context context, @StyleRes int materialCalendarDayStyle) {
    Resources resources = context.getResources();
    Preconditions.checkArgument(
        materialCalendarDayStyle != 0, "Cannot create a CalendarItemStyle with a styleResId of 0");
    TypedArray styleableArray =
        context.obtainStyledAttributes(materialCalendarDayStyle, R.styleable.MaterialCalendarDay);
    ColorStateList backgroundColor =
        MaterialResources.getColorStateList(
            context, styleableArray, R.styleable.MaterialCalendarDay_itemFillColor);
    ColorStateList textColor =
        MaterialResources.getColorStateList(
            context, styleableArray, R.styleable.MaterialCalendarDay_itemTextColor);
    ColorStateList strokeColor =
        MaterialResources.getColorStateList(
            context, styleableArray, R.styleable.MaterialCalendarDay_itemStrokeColor);
    int strokeWidth =
        styleableArray.getDimensionPixelSize(R.styleable.MaterialCalendarDay_itemStrokeWidth, 0);

    int shapeAppearanceResId =
        styleableArray.getResourceId(R.styleable.MaterialCalendarDay_itemShapeAppearance, 0);
    int shapeAppearanceOverlayResId =
        styleableArray.getResourceId(R.styleable.MaterialCalendarDay_itemShapeAppearanceOverlay, 0);

    ShapeAppearanceModel itemShape =
        new ShapeAppearanceModel(context, shapeAppearanceResId, shapeAppearanceOverlayResId);
    styleableArray.recycle();

    int horizontalPadding =
        (resources.getDimensionPixelSize(R.dimen.mtrl_calendar_day_width)
                - 2 * resources.getDimensionPixelOffset(R.dimen.mtrl_calendar_day_selection_corner))
            / 2;
    int verticalPadding =
        (resources.getDimensionPixelSize(R.dimen.mtrl_calendar_day_height)
                - 2 * resources.getDimensionPixelOffset(R.dimen.mtrl_calendar_day_selection_corner))
            / 2;

    return new CalendarItemStyle(
        backgroundColor,
        textColor,
        strokeColor,
        strokeWidth,
        itemShape,
        horizontalPadding,
        verticalPadding);
  }

  /** Applies the {@link R.styleable#MaterialCalendarDay} style to the provided {@code item} */
  void styleItem(TextView item) {
    item.setTextColor(textColor);
    Drawable d;
    if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
      d = new RippleDrawable(textColor.withAlpha(30), backgroundDrawable, shapeMask);
    } else {
      d = backgroundDrawable;
    }
    ViewCompat.setBackground(
        item,
        new InsetDrawable(
            d, horizontalPadding, verticalPadding, horizontalPadding, verticalPadding));
  }
}