Add: ViewModel for ProductsFragment

src/main/kotlin/com/looker/droidify/ui/ProductsViewModel.kt

@@ -0,0 +1,47 @@
+package com.looker.droidify.ui
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.looker.droidify.entity.ProductItem
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+
+class ProductsViewModel : ViewModel() {
+
+    private val _order = MutableStateFlow(ProductItem.Order.LAST_UPDATE)
+    private val _sections = MutableStateFlow<ProductItem.Section>(ProductItem.Section.All)
+    private val _searchQuery = MutableStateFlow("")
+
+    val order: StateFlow<ProductItem.Order> = _order
+    val sections: StateFlow<ProductItem.Section> = _sections
+    val searchQuery: StateFlow<String> = _searchQuery
+
+    fun setSection(newSection: ProductItem.Section, perform: () -> Unit) {
+        viewModelScope.launch(Dispatchers.Main) {
+            if (newSection != sections.value) {
+                _sections.emit(newSection)
+                perform()
+            }
+        }
+    }
+
+    fun setOrder(newOrder: ProductItem.Order, perform: () -> Unit) {
+        viewModelScope.launch(Dispatchers.Main) {
+            if (newOrder != order.value) {
+                _order.emit(newOrder)
+                perform()
+            }
+        }
+    }
+
+    fun setSearchQuery(newSearchQuery: String, perform: () -> Unit) {
+        viewModelScope.launch(Dispatchers.Main) {
+            if (newSearchQuery != searchQuery.value) {
+                _searchQuery.emit(newSearchQuery)
+                perform()
+            }
+        }
+    }
+}