ShapeAttributeView.kt

/*
 * 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 io.material.materialthemebuilder.widget

import android.content.Context
import android.content.res.ColorStateList
import android.graphics.Color
import com.google.android.material.shape.MaterialShapeDrawable
import com.google.android.material.shape.ShapeAppearanceModel
import androidx.core.view.ViewCompat
import androidx.appcompat.widget.AppCompatTextView
import android.util.AttributeSet
import android.view.View
import android.widget.FrameLayout
import io.material.materialthemebuilder.R

/**
 * A composite view to display a text label and a shape preview view.
 *
 * The shape preview view is used to visualize the properties of shapeAppearance theme attributes.
 * The shape preview view is a TextView with it's background set to a MaterialShapeDrawable,
 * inflated according to this view's app:shapeAppearanceAttr property.
 */
class ShapeAttributeView @JvmOverloads constructor(
  context: Context,
  private val attrs: AttributeSet? = null,
  private val defStyleAttr: Int = 0,
  defStyleRes: Int = 0
) : FrameLayout(context, attrs, defStyleAttr, defStyleRes) {

  private val shapeAttributeTextView: AppCompatTextView
  private val shapePreviewView: AppCompatTextView

  var shapeAttrText: String = "?shapeAppearanceSmallComponent"
    set(value) {
      shapeAttributeTextView.text = value
      field = value
    }

  private var shape = MaterialShapeDrawable().apply {
    strokeWidth = DEFAULT_SHAPE_STROKE_WIDTH
  }

  var shapeAppearanceRes: Int = R.attr.shapeAppearanceSmallComponent
    set(value) {
      shape.shapeAppearanceModel = ShapeAppearanceModel.builder(
        context,
        attrs,
        defStyleAttr,
        getShapeAppearanceDefaultRes(value)
      ).build()

      ViewCompat.setBackground(shapePreviewView, shape)

      field = value
    }

  var shapeFillColor: Int = Color.LTGRAY
    set(value) {
      shape.fillColor = ColorStateList.valueOf(value)
      field = value
    }

  var shapeStrokeColor: Int = Color.DKGRAY
    set(value) {
      shape.strokeColor = ColorStateList.valueOf(value)
      field = value
    }

  var shapeLetter: String = context.getString(R.string.shape_appearance_small_label)
    set(value) {
      shapePreviewView.text = value
      field = value
    }

  init {
    val view = View.inflate(context, R.layout.shape_attribute_view_layout, this)
    shapeAttributeTextView = view.findViewById(R.id.shape_attribute)
    shapePreviewView = view.findViewById(R.id.shape_preview)

    val a = context.theme.obtainStyledAttributes(
      attrs,
      R.styleable.ShapeAttributeView,
      defStyleAttr,
      defStyleRes
    )
    shapeAttrText = a.getString(
      R.styleable.ShapeAttributeView_android_text
    ) ?: shapeAttrText

    shapeFillColor = a.getColor(
      R.styleable.ShapeAttributeView_shapeFillColor,
      Color.LTGRAY
    )
    shapeStrokeColor = a.getColor(
      R.styleable.ShapeAttributeView_shapeStrokeColor,
      Color.DKGRAY
    )
    shapeAppearanceRes = a.getResourceId(
      R.styleable.ShapeAttributeView_shapeAppearanceAttr,
      R.attr.shapeAppearanceSmallComponent
    )

    shapeLetter = a.getString(
      R.styleable.ShapeAttributeView_shapeSizeLetter
    ) ?: shapeLetter

    a.recycle()
  }

  private fun getShapeAppearanceDefaultRes(shapeAppearanceRes: Int) = when (shapeAppearanceRes) {
    R.attr.shapeAppearanceMediumComponent -> R.style.Widget_MaterialComponents_CardView
    R.attr.shapeAppearanceLargeComponent -> R.style.Widget_MaterialComponents_NavigationView
    else -> R.style.Widget_MaterialComponents_Button
  }

  companion object {
    private const val DEFAULT_SHAPE_STROKE_WIDTH = 2F
  }
}