Perform a global search while seatching in the library

There's a button at the top of the list to do it

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryCategoryAdapter.kt

@@ -208,5 +208,6 @@ class LibraryCategoryAdapter(val controller: LibraryController) :
         fun allSelected(position: Int): Boolean
         fun toggleCategoryVisibility(position: Int)
         fun manageCategory(position: Int)
+        fun globalSearch(query: String)
     }
 }

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt

@@ -58,6 +58,7 @@ import eu.kanade.tachiyomi.ui.main.RootSearchInterface
 import eu.kanade.tachiyomi.ui.manga.MangaDetailsController
 import eu.kanade.tachiyomi.ui.migration.manga.design.PreMigrationController
 import eu.kanade.tachiyomi.ui.reader.ReaderActivity
+import eu.kanade.tachiyomi.ui.source.global_search.SourceSearchController
 import eu.kanade.tachiyomi.util.system.dpToPx
 import eu.kanade.tachiyomi.util.system.getResourceColor
 import eu.kanade.tachiyomi.util.system.launchUI
@@ -145,6 +146,7 @@ class LibraryController(
         private set
 
     private var observeLater: Boolean = false
+    var searchItem = SearchGlobalItem()
 
     var snack: Snackbar? = null
 
@@ -285,9 +287,11 @@ class LibraryController(
             override fun getSpanSize(position: Int): Int {
                 if (libraryLayout == 0) return 1
                 val item = this@LibraryController.adapter.getItem(position)
-                return if (item is LibraryHeaderItem) recycler.manager.spanCount
-                else if (item is LibraryItem && item.manga.isBlank()) recycler.manager.spanCount
-                else 1
+                return if (item is LibraryHeaderItem || item is SearchGlobalItem || (item is LibraryItem && item.manga.isBlank())) {
+                    recycler.manager.spanCount
+                } else {
+                    1
+                }
             }
         })
         recycler.setHasFixedSize(true)
@@ -799,6 +803,15 @@ class LibraryController(
 
     fun search(query: String?): Boolean {
         this.query = query ?: ""
+        if (this.query.isNotBlank() && adapter.scrollableHeaders.isEmpty()) {
+            searchItem.string = this.query
+            adapter.addScrollableHeader(searchItem)
+        } else if (this.query.isNotBlank()) {
+            searchItem.string = this.query
+            (recycler.findViewHolderForAdapterPosition(0) as? SearchGlobalItem.Holder)?.bind(this.query)
+        } else if (this.query.isBlank() && adapter.scrollableHeaders.isNotEmpty()) {
+            adapter.removeAllScrollableHeaders()
+        }
         adapter.setFilter(query)
         adapter.performFilter()
         return true
@@ -915,7 +928,7 @@ class LibraryController(
      * @param position the position of the element clicked.
      */
     override fun onItemLongClick(position: Int) {
-        if (adapter.getItem(position) is LibraryHeaderItem) return
+        if (adapter.getItem(position) !is LibraryItem) return
         createActionModeIfNeeded()
         when {
             lastClickPosition == -1 -> setSelection(position)
@@ -930,6 +943,10 @@ class LibraryController(
         lastClickPosition = position
     }
 
+    override fun globalSearch(query: String) {
+        router.pushController(SourceSearchController(query).withFadeTransaction())
+    }
+
     override fun onActionStateChanged(viewHolder: RecyclerView.ViewHolder?, actionState: Int) {
         val position = viewHolder?.adapterPosition ?: return
         swipe_refresh.isEnabled = actionState != ItemTouchHelper.ACTION_STATE_DRAG

app/src/main/java/eu/kanade/tachiyomi/ui/library/SearchGlobalItem.kt

@@ -0,0 +1,84 @@
+package eu.kanade.tachiyomi.ui.library
+
+import android.view.View
+import android.view.ViewGroup
+import android.view.ViewGroup.LayoutParams.MATCH_PARENT
+import androidx.recyclerview.widget.RecyclerView
+import eu.davidea.flexibleadapter.FlexibleAdapter
+import eu.davidea.flexibleadapter.items.AbstractFlexibleItem
+import eu.davidea.flexibleadapter.items.IFlexible
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.ui.base.holder.BaseFlexibleViewHolder
+import eu.kanade.tachiyomi.util.view.updateLayoutParams
+import kotlinx.android.synthetic.main.material_text_button.*
+
+class SearchGlobalItem : AbstractFlexibleItem<SearchGlobalItem.Holder>() {
+
+    var string = ""
+
+    override fun getLayoutRes(): Int {
+        return R.layout.material_text_button
+    }
+
+    override fun createViewHolder(
+        view: View,
+        adapter: FlexibleAdapter<IFlexible<RecyclerView.ViewHolder>>
+    ): Holder {
+        view.updateLayoutParams<ViewGroup.MarginLayoutParams> {
+            width = MATCH_PARENT
+        }
+        return Holder(view, adapter)
+    }
+
+    override fun isSelectable(): Boolean {
+        return false
+    }
+
+    override fun isSwipeable(): Boolean {
+        return false
+    }
+
+    override fun isDraggable(): Boolean {
+        return false
+    }
+
+    override fun bindViewHolder(
+        adapter: FlexibleAdapter<IFlexible<RecyclerView.ViewHolder>>,
+        holder: Holder,
+        position: Int,
+        payloads: MutableList<Any>
+    ) {
+        holder.bind(string)
+    }
+
+    override fun equals(other: Any?): Boolean {
+        return this === other
+    }
+
+    override fun hashCode(): Int {
+        return -100
+    }
+
+    class Holder(val view: View, adapter: FlexibleAdapter<IFlexible<RecyclerView.ViewHolder>>) :
+        BaseFlexibleViewHolder(view, adapter, true) {
+
+        init {
+            button.updateLayoutParams<ViewGroup.MarginLayoutParams> {
+                width = MATCH_PARENT
+            }
+            button.setOnClickListener {
+                val query = (adapter.getItem(adapterPosition) as SearchGlobalItem).string
+                (adapter as? LibraryCategoryAdapter)?.libraryListener?.globalSearch(query)
+            }
+        }
+
+        fun bind(string: String) {
+            button.text = view.context.getString(R.string.search_globally, string)
+        }
+
+        override fun onLongClick(view: View?): Boolean {
+            super.onLongClick(view)
+            return false
+        }
+    }
+}

app/src/main/res/layout/material_text_button.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <com.google.android.material.button.MaterialButton style="@style/Theme.Widget.Button.TextButton"
+    android:id="@+id/button"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="@string/set_as_default_for_all"

app/src/main/res/values/strings.xml

@@ -119,6 +119,7 @@
     <string name="collapse_all_categories">Collapse all categories</string>
     <string name="reorder_filters">Reorder filters</string>
     <string name="_unread">%d unread</string>
+    <string name="search_globally">Search \"%1$s\" globally</string>
 
     <string name="read_progress">Read progress</string>
     <string name="series_type">Series type</string>