Typing digit '0' in code completion list moves down by 9 items

build.gradle.kts

@@ -5,7 +5,7 @@ plugins {
 }
 
 group = "com.chylex.intellij.keyboardmaster"
-version = "0.1"
+version = "0.1.1"
 
 repositories {
     mavenCentral()

src/main/kotlin/com/chylex/intellij/keyboardmaster/lookup/LookupTypedActionHandler.kt

@@ -6,9 +6,11 @@ import com.intellij.codeInsight.template.impl.editorActions.TypedActionHandlerBa
 import com.intellij.openapi.actionSystem.DataContext
 import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.editor.actionSystem.TypedActionHandler
+import com.intellij.ui.ScrollingUtil
 
 /**
- * When typing digits inside a code completion popup menu, selects the n-th item (or 10th item if the digit is 0) in the list.
+ * When typing digits 1-9 inside a code completion popup menu, selects the n-th item in the list.
+ * When typing the digit 0, moves down the list by 9 items, wrapping around if needed.
  */
 class LookupTypedActionHandler(originalHandler: TypedActionHandler?) : TypedActionHandlerBase(originalHandler) {
 	override fun execute(editor: Editor, charTyped: Char, dataContext: DataContext) {
@@ -27,7 +29,23 @@ class LookupTypedActionHandler(originalHandler: TypedActionHandler?) : TypedActi
 			return false
 		}
 		
-		lookup.selectedIndex = if (charTyped == '0') 9 else charTyped - '1'
+		val offset = ProjectLookupListener.getLookupOffset(lookup)
+		
+		if (charTyped == '0') {
+			val list = lookup.list
+			val itemCount = list.model.size
+			val topIndex = (offset + 9).let { if (it >= itemCount) 0 else it }
+			
+			ProjectLookupListener.setLookupOffset(lookup, topIndex)
+			lookup.selectedIndex = topIndex
+			ScrollingUtil.ensureRangeIsVisible(list, topIndex, topIndex + 8)
+			lookup.markSelectionTouched()
+			lookup.refreshUi(false, true)
+		}
+		else {
+			lookup.selectedIndex = offset + (charTyped - '1')
+		}
+		
 		return true
 	}
 }

src/main/kotlin/com/chylex/intellij/keyboardmaster/lookup/ProjectLookupListener.kt

@@ -11,8 +11,24 @@ import com.intellij.openapi.util.Key
  */
 class ProjectLookupListener : LookupManagerListener {
 	companion object {
+		private val OFFSET_KEY = Key.create<Int>("chylexKeyboardMasterOffset")
 		private val IS_MODIFIED_KEY = Key.create<Boolean>("chylexKeyboardMasterModified")
-		private val HINT_TEXT = Array(10) { " [${(it + 1) % 10}]" }
+		
+		private val HINT_TEXT = Array(9) { " [${it + 1}]" }
+		
+		fun getLookupOffset(lookup: LookupImpl): Int {
+			val offset = lookup.getUserData(OFFSET_KEY)
+			if (offset == null || offset >= lookup.list.model.size) {
+				return 0
+			}
+			else {
+				return offset
+			}
+		}
+		
+		fun setLookupOffset(lookup: LookupImpl, newOffset: Int) {
+			lookup.putUserData(OFFSET_KEY, newOffset)
+		}
 	}
 	
 	override fun activeLookupChanged(oldLookup: Lookup?, newLookup: Lookup?) {
@@ -24,13 +40,20 @@ class ProjectLookupListener : LookupManagerListener {
 		
 		@Suppress("UnstableApiUsage")
 		newLookup.addPresentationCustomizer { item, presentation ->
-			val items = newLookup.list.model
+			val itemList = newLookup.list.model
+			val itemCount = itemList.size
+			val offset = getLookupOffset(newLookup)
 			
-			for (index in 0 until items.size.coerceAtMost(10)) {
-				if (item === items.getElementAt(index)) {
+			for (digitIndex in 0 until 9) {
+				val itemIndex = offset + digitIndex
+				if (itemIndex >= itemCount) {
+					break
+				}
+				
+				if (item === itemList.getElementAt(itemIndex)) {
 					val customized = LookupElementPresentation()
 					customized.copyFrom(presentation)
-					customized.appendTailTextItalic(HINT_TEXT[index], true)
+					customized.appendTailTextItalic(HINT_TEXT[digitIndex], true)
 					return@addPresentationCustomizer customized
 				}
 			}