Handle backpress

app/src/main/java/xyz/quaver/pupil/sources/History.kt

@@ -47,7 +47,6 @@ class History(override val di: DI, source: String) : Source<DefaultSortMode, Sea
         val channel = Channel<ItemInfo>()
 
         CoroutineScope(Dispatchers.IO).launch {
-            Logger.d(histories.map)
             histories.map[source.name]?.forEach {
                 channel.send(source.info(it))
             }

app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt

@@ -33,6 +33,7 @@ import android.widget.ImageView
 import android.widget.TextView
 import androidx.activity.viewModels
 import androidx.appcompat.app.AlertDialog
+import androidx.core.view.GravityCompat
 import androidx.core.view.ViewCompat
 import androidx.core.view.children
 import androidx.core.widget.ImageViewCompat
@@ -171,19 +172,10 @@ class MainActivity :
 
     @OptIn(ExperimentalStdlibApi::class)
     override fun onBackPressed() {
-
-        // TODO model.onBackPressed()
-        /*
-        when {
-            binding.drawer.isDrawerOpen(GravityCompat.START) -> binding.drawer.closeDrawer(GravityCompat.START)
-            queryStack.removeLastOrNull() != null && queryStack.isNotEmpty() -> runOnUiThread {
-                model.query.value = queryStack.last()
-
-                model.query()
-            }
-            else -> super.onBackPressed()
-        }
-         */
+        if (binding.drawer.isDrawerOpen(GravityCompat.START))
+            binding.drawer.closeDrawer(GravityCompat.START)
+        else if (!model.onBackPressed())
+                super.onBackPressed()
     }
 
     override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {

app/src/main/java/xyz/quaver/pupil/ui/viewmodel/MainViewModel.kt

@@ -21,7 +21,6 @@ package xyz.quaver.pupil.ui.viewmodel
 import android.annotation.SuppressLint
 import android.app.Application
 import androidx.lifecycle.*
-import com.orhanobut.logger.Logger
 import kotlinx.coroutines.*
 import org.kodein.di.DIAware
 import org.kodein.di.android.x.di
@@ -87,13 +86,12 @@ class MainViewModel(app: Application) : AndroidViewModel(app), DIAware {
             sortMode.value = it.availableSortMode.first()
         }
 
-        Logger.i("SOURCE SET TO $sourceName")
-
         setQueryAndSearch()
     }
 
     fun setQueryAndSearch(query: String = "") {
         this.query.value = query
+        queryStack.add(query)
         setPage(1)
 
         query()
@@ -172,4 +170,15 @@ class MainViewModel(app: Application) : AndroidViewModel(app), DIAware {
         }
     }
 
+    /**
+     * @return true if backpress is consumed, false otherwise
+     */
+    fun onBackPressed(): Boolean {
+        if (queryStack.removeLastOrNull() == null || queryStack.isEmpty())
+            return false
+
+        setQueryAndSearch(queryStack.removeLast())
+        return true
+    }
+
 }