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Michatec
282
app/src/main/java/com/michatec/radio/helpers/UiHelper.kt
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282
app/src/main/java/com/michatec/radio/helpers/UiHelper.kt
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/*
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* UiHelper.kt
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* Implements the UiHelper object
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* A UiHelper provides helper methods for User Interface related tasks
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*
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* This file is part of
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* TRANSISTOR - Radio App for Android
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*
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* Copyright (c) 2015-22 - Y20K.org
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* Licensed under the MIT-License
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* http://opensource.org/licenses/MIT
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*/
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package com.michatec.radio.helpers
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import android.content.Context
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import android.graphics.Canvas
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import android.graphics.Paint
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import android.graphics.PorterDuff
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import android.graphics.PorterDuffXfermode
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import android.graphics.RectF
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import android.view.View
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import android.view.ViewGroup
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import android.view.inputmethod.InputMethodManager
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import androidx.core.content.ContextCompat
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import androidx.recyclerview.widget.ItemTouchHelper
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import androidx.recyclerview.widget.RecyclerView
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import com.michatec.radio.Keys
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import com.michatec.radio.R
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/*
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* UiHelper object
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*/
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object UiHelper {
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/* Sets layout margins for given view in DP */
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fun setViewMargins(
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context: Context,
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view: View,
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left: Int = 0,
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right: Int = 0,
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top: Int = 0,
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bottom: Int = 0
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) {
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val l: Int = (left * ImageHelper.getDensityScalingFactor(context)).toInt()
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val r: Int = (right * ImageHelper.getDensityScalingFactor(context)).toInt()
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val t: Int = (top * ImageHelper.getDensityScalingFactor(context)).toInt()
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val b: Int = (bottom * ImageHelper.getDensityScalingFactor(context)).toInt()
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if (view.layoutParams is ViewGroup.MarginLayoutParams) {
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val p = view.layoutParams as ViewGroup.MarginLayoutParams
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p.setMargins(l, t, r, b)
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view.requestLayout()
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}
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}
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/* Hide keyboard */
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fun hideSoftKeyboard(context: Context, view: View) {
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val imm = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
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imm.hideSoftInputFromWindow(view.windowToken, 0)
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}
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/*
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* Inner class: Callback that detects a swipe to left
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* Credit: https://github.com/kitek/android-rv-swipe-delete/blob/master/app/src/main/java/pl/kitek/rvswipetodelete/SwipeToDeleteCallback.kt
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*/
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abstract class SwipeToDeleteCallback(context: Context) :
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ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT) {
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private val deleteIcon = ContextCompat.getDrawable(context, R.drawable.ic_remove_circle_24dp)
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private val intrinsicWidth: Int = deleteIcon?.intrinsicWidth ?: 0
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private val intrinsicHeight: Int = deleteIcon?.intrinsicHeight ?: 0
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private val backgroundColor = ContextCompat.getColor(context, R.color.list_card_delete_background)
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private val clearPaint: Paint = Paint().apply { xfermode = PorterDuffXfermode(PorterDuff.Mode.CLEAR) }
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private val cornerRadius: Float = dpToPx(context)
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override fun getMovementFlags(
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recyclerView: RecyclerView,
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viewHolder: RecyclerView.ViewHolder
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): Int {
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// disable swipe for the add new card
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if (viewHolder.itemViewType == Keys.VIEW_TYPE_ADD_NEW) {
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return 0
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}
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return super.getMovementFlags(recyclerView, viewHolder)
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}
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override fun onMove(
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recyclerView: RecyclerView,
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viewHolder: RecyclerView.ViewHolder,
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target: RecyclerView.ViewHolder
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): Boolean {
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// do nothing
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return false
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}
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override fun onChildDraw(
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c: Canvas,
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recyclerView: RecyclerView,
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viewHolder: RecyclerView.ViewHolder,
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dX: Float,
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dY: Float,
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actionState: Int,
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isCurrentlyActive: Boolean
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) {
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val itemView = viewHolder.itemView
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val itemHeight = itemView.bottom - itemView.top
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val isCanceled = dX == 0f && !isCurrentlyActive
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if (isCanceled) {
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clearCanvas(
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c,
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itemView.right + dX,
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itemView.top.toFloat(),
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itemView.right.toFloat(),
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itemView.bottom.toFloat()
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)
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super.onChildDraw(
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c,
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recyclerView,
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viewHolder,
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dX,
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dY,
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actionState,
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false
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)
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return
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}
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// draw delete and rounded background
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val roundedBackground = RectF(
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itemView.left.toFloat(),
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itemView.top.toFloat(),
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itemView.right.toFloat(),
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itemView.bottom.toFloat()
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)
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val paint = Paint()
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paint.color = backgroundColor
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c.drawRoundRect(roundedBackground, cornerRadius, cornerRadius, paint)
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// calculate position of delete icon
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val deleteIconTop = itemView.top + (itemHeight - intrinsicHeight) / 2
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val deleteIconMargin = (itemHeight - intrinsicHeight) / 2
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val deleteIconLeft = itemView.right - deleteIconMargin - intrinsicWidth
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val deleteIconRight = itemView.right - deleteIconMargin
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val deleteIconBottom = deleteIconTop + intrinsicHeight
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// draw delete icon
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deleteIcon?.setBounds(deleteIconLeft, deleteIconTop, deleteIconRight, deleteIconBottom)
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deleteIcon?.draw(c)
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super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
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}
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private fun clearCanvas(c: Canvas?, left: Float, top: Float, right: Float, bottom: Float) {
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c?.drawRect(left, top, right, bottom, clearPaint)
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}
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// conversion from dp to px
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private fun dpToPx(context: Context): Float {
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val density = context.resources.displayMetrics.density
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return 24 * density
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}
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}
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/*
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* End of inner class
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*/
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/*
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* Inner class: Callback that detects a swipe to left
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* Credit: https://github.com/kitek/android-rv-swipe-delete/blob/master/app/src/main/java/pl/kitek/rvswipetodelete/SwipeToDeleteCallback.kt
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*/
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abstract class SwipeToMarkStarredCallback(context: Context) :
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ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.RIGHT) {
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private val starIcon = ContextCompat.getDrawable(context, R.drawable.ic_favorite_24dp)
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private val intrinsicWidth: Int = starIcon?.intrinsicWidth ?: 0
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private val intrinsicHeight: Int = starIcon?.intrinsicHeight ?: 0
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private val backgroundColor = ContextCompat.getColor(context, R.color.list_card_mark_starred_background)
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private val clearPaint: Paint = Paint().apply { xfermode = PorterDuffXfermode(PorterDuff.Mode.CLEAR) }
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private val cornerRadius: Float = dpToPx(context)
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override fun getMovementFlags(
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recyclerView: RecyclerView,
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viewHolder: RecyclerView.ViewHolder
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): Int {
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// disable swipe for the add new card
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if (viewHolder.itemViewType == Keys.VIEW_TYPE_ADD_NEW) {
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return 0
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}
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return super.getMovementFlags(recyclerView, viewHolder)
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}
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override fun onMove(
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recyclerView: RecyclerView,
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viewHolder: RecyclerView.ViewHolder,
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target: RecyclerView.ViewHolder
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): Boolean {
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// do nothing
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return false
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}
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override fun onChildDraw(
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c: Canvas,
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recyclerView: RecyclerView,
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viewHolder: RecyclerView.ViewHolder,
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dX: Float,
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dY: Float,
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actionState: Int,
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isCurrentlyActive: Boolean
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) {
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val itemView = viewHolder.itemView
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val itemHeight = itemView.bottom - itemView.top
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val isCanceled = dX == 0f && !isCurrentlyActive
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if (isCanceled) {
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clearCanvas(
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c,
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itemView.right + dX,
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itemView.top.toFloat(),
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itemView.right.toFloat(),
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itemView.bottom.toFloat()
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)
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super.onChildDraw(
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c,
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recyclerView,
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viewHolder,
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dX,
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dY,
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actionState,
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false
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)
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return
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}
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// draw favorite color and rounded background
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val roundedBackground = RectF(
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itemView.left.toFloat(),
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itemView.top.toFloat(),
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itemView.right.toFloat(),
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itemView.bottom.toFloat()
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)
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val paint = Paint()
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paint.color = backgroundColor
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c.drawRoundRect(roundedBackground, cornerRadius, cornerRadius, paint)
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// calculate position of delete icon
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val deleteIconTop = itemView.top + (itemHeight - intrinsicHeight) / 2
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val deleteIconMargin = (itemHeight - intrinsicHeight) / 2
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val deleteIconLeft = itemView.left + deleteIconMargin
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val deleteIconRight = itemView.left + deleteIconMargin + intrinsicWidth
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val deleteIconBottom = deleteIconTop + intrinsicHeight
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// draw delete icon
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starIcon?.setBounds(deleteIconLeft, deleteIconTop, deleteIconRight, deleteIconBottom)
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starIcon?.draw(c)
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super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
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}
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private fun clearCanvas(c: Canvas?, left: Float, top: Float, right: Float, bottom: Float) {
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c?.drawRect(left, top, right, bottom, clearPaint)
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}
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// conversion from dp to px
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private fun dpToPx(context: Context): Float {
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val density = context.resources.displayMetrics.density
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return 24 * density
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}
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}
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/*
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* End of inner class
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*/
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}
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