1 files changed, 103 insertions, 0 deletions
diff --git a/core/src/main/kotlin/ca/allanwang/kau/xml/Changelog.kt b/core/src/main/kotlin/ca/allanwang/kau/xml/Changelog.kt
new file mode 100644
index 0000000..4bf1836
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/xml/Changelog.kt
@@ -0,0 +1,103 @@
+package ca.allanwang.kau.xml
+
+import android.content.Context
+import android.content.res.XmlResourceParser
+import android.support.annotation.ColorInt
+import android.support.annotation.LayoutRes
+import android.support.annotation.XmlRes
+import android.support.v7.widget.RecyclerView
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import ca.allanwang.kau.R
+import ca.allanwang.kau.utils.bindOptionalView
+import ca.allanwang.kau.utils.bindView
+import ca.allanwang.kau.utils.materialDialog
+import ca.allanwang.kau.utils.use
+import com.afollestad.materialdialogs.MaterialDialog
+import org.jetbrains.anko.doAsync
+import org.jetbrains.anko.uiThread
+import org.xmlpull.v1.XmlPullParser
+
+
+/**
+ * Created by Allan Wang on 2017-05-28.
+ */
+
+fun Context.showChangelog(@XmlRes xmlRes: Int, @ColorInt textColor: Int? = null, customize: MaterialDialog.Builder.() -> Unit = {}) {
+    doAsync {
+        val items = parse(this@showChangelog, xmlRes)
+        uiThread {
+            materialDialog {
+                title(R.string.kau_changelog)
+                positiveText(R.string.kau_great)
+                adapter(ChangelogAdapter(items, textColor), null)
+                customize()
+            }
+        }
+    }
+}
+
+/**
+ * Internals of the changelog dialog
+ * Contains an mainAdapter for each item, as well as the tags to parse
+ */
+internal class ChangelogAdapter(val items: List<Pair<String, ChangelogType>>, @ColorInt val textColor: Int? = null) : RecyclerView.Adapter<ChangelogAdapter.ChangelogVH>() {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) = ChangelogVH(LayoutInflater.from(parent.context)
+            .inflate(items[viewType].second.layout, parent, false))
+
+    override fun onBindViewHolder(holder: ChangelogVH, position: Int) {
+        holder.text.text = items[position].first
+        if (textColor != null) {
+            holder.text.setTextColor(textColor)
+            holder.bullet?.setTextColor(textColor)
+        }
+    }
+
+    override fun getItemId(position: Int) = position.toLong()
+
+    override fun getItemViewType(position: Int) = position
+
+    override fun getItemCount() = items.size
+
+    internal class ChangelogVH(itemView: View) : RecyclerView.ViewHolder(itemView) {
+        val text: TextView by bindView(R.id.kau_changelog_text)
+        val bullet: TextView? by bindOptionalView(R.id.kau_changelog_bullet)
+    }
+}
+
+internal fun parse(context: Context, @XmlRes xmlRes: Int): List<Pair<String, ChangelogType>> {
+    val items = mutableListOf<Pair<String, ChangelogType>>()
+    context.resources.getXml(xmlRes).use {
+        parser: XmlResourceParser ->
+        var eventType = parser.eventType
+        while (eventType != XmlPullParser.END_DOCUMENT) {
+            if (eventType == XmlPullParser.START_TAG)
+                ChangelogType.values.any { it.add(parser, items) }
+            eventType = parser.next()
+        }
+    }
+    return items
+}
+
+internal enum class ChangelogType(val tag: String, val attr: String, @LayoutRes val layout: Int) {
+    TITLE("version", "title", R.layout.kau_changelog_title),
+    ITEM("item", "text", R.layout.kau_changelog_content);
+
+    companion object {
+        @JvmStatic val values = values()
+    }
+
+    /**
+     * Returns true if tag matches; false otherwise
+     */
+    fun add(parser: XmlResourceParser, list: MutableList<Pair<String, ChangelogType>>): Boolean {
+        if (parser.name != tag) return false
+        if (parser.getAttributeValue(null, attr).isNotBlank())
+            list.add(Pair(parser.getAttributeValue(null, attr), this))
+        return true
+    }
+}
+