Create polls (#1452)

* add AddPollDialog

* add support for pleroma poll options

* add PollPreviewView

* add Poll support to drafts

* add license header, cleanup

* rename drawable files to correct size

* fix tests

* fix bug with Poll having wrong duration after delete&redraft

* add input validation

* grey out poll button when its disabled

* code cleanup & small improvements

app/src/main/java/com/keylesspalace/tusky/adapter/AddPollOptionsAdapter.kt

@@ -0,0 +1,92 @@
+/* Copyright 2019 Tusky Contributors
+ *
+ * This file is a part of Tusky.
+ *
+ * This program is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.adapter
+
+import android.text.InputFilter
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.ImageButton
+import androidx.recyclerview.widget.RecyclerView
+import com.google.android.material.textfield.TextInputEditText
+import com.google.android.material.textfield.TextInputLayout
+import com.keylesspalace.tusky.R
+import com.keylesspalace.tusky.util.onTextChanged
+import com.keylesspalace.tusky.util.visible
+
+class AddPollOptionsAdapter(
+        private var options: MutableList<String>,
+        private val maxOptionLength: Int,
+        private val onOptionRemoved: () -> Unit,
+        private val onOptionChanged: (Boolean) -> Unit
+): RecyclerView.Adapter<ViewHolder>() {
+
+    val pollOptions: List<String>
+        get() = options.toList()
+
+    fun addChoice() {
+        options.add("")
+        notifyItemInserted(options.size - 1)
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val holder = ViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.item_add_poll_option, parent, false))
+        holder.editText.filters = arrayOf(InputFilter.LengthFilter(maxOptionLength))
+
+        holder.editText.onTextChanged { s, _, _, _ ->
+            val pos = holder.adapterPosition
+            if(pos != RecyclerView.NO_POSITION) {
+                options[pos] = s.toString()
+                onOptionChanged(validateInput())
+            }
+        }
+
+        return holder
+    }
+
+    override fun getItemCount() = options.size
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        holder.editText.setText(options[position])
+
+        holder.textInputLayout.hint = holder.textInputLayout.context.getString(R.string.poll_new_choice_hint, position + 1)
+
+        holder.deleteButton.visible(position > 1, View.INVISIBLE)
+
+        holder.deleteButton.setOnClickListener {
+            holder.editText.clearFocus()
+            options.removeAt(holder.adapterPosition)
+            notifyItemRemoved(holder.adapterPosition)
+            onOptionRemoved()
+        }
+    }
+
+    private fun validateInput(): Boolean {
+        if (options.contains("") || options.distinct().size != options.size) {
+            return false
+        }
+
+        return true
+    }
+
+}
+
+
+class ViewHolder(itemView: View): RecyclerView.ViewHolder(itemView) {
+    val textInputLayout: TextInputLayout = itemView.findViewById(R.id.optionTextInputLayout)
+    val editText: TextInputEditText = itemView.findViewById(R.id.optionEditText)
+    val deleteButton: ImageButton = itemView.findViewById(R.id.deleteButton)
+}

app/src/main/java/com/keylesspalace/tusky/adapter/PreviewPollOptionsAdapter.kt

@@ -0,0 +1,70 @@
+/* Copyright 2019 Tusky Contributors
+ *
+ * This file is a part of Tusky.
+ *
+ * This program is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.adapter
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.core.widget.TextViewCompat
+import androidx.recyclerview.widget.RecyclerView
+import com.keylesspalace.tusky.R
+import com.keylesspalace.tusky.util.ThemeUtils
+
+class PreviewPollOptionsAdapter: RecyclerView.Adapter<PreviewViewHolder>() {
+
+    private var options: List<String> = emptyList()
+    private var multiple: Boolean = false
+    private var clickListener: View.OnClickListener? = null
+
+    fun update(newOptions: List<String>, multiple: Boolean) {
+        this.options = newOptions
+        this.multiple = multiple
+        notifyDataSetChanged()
+    }
+
+    fun setOnClickListener(l: View.OnClickListener?) {
+        clickListener = l
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PreviewViewHolder {
+        return PreviewViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.item_poll_preview_option, parent, false))
+    }
+
+    override fun getItemCount() = options.size
+
+    override fun onBindViewHolder(holder: PreviewViewHolder, position: Int) {
+        val textView = holder.itemView as TextView
+
+        val iconId = if (multiple) {
+            R.drawable.ic_check_box_outline_blank_18dp
+        } else {
+            R.drawable.ic_radio_button_unchecked_18dp
+        }
+
+        val iconDrawable = ThemeUtils.getTintedDrawable(textView.context, iconId, android.R.attr.textColorTertiary)
+
+        TextViewCompat.setCompoundDrawablesRelativeWithIntrinsicBounds(textView, iconDrawable, null, null, null)
+
+        textView.text = options[position]
+
+        textView.setOnClickListener(clickListener)
+    }
+
+}
+
+
+class PreviewViewHolder(itemView: View): RecyclerView.ViewHolder(itemView)