Wizard: do not allow to edit module name when it is an only root module

idea/idea-new-project-wizard/src/org/jetbrains/kotlin/tools/projectWizard/wizard/ui/components/TextFieldComponent.kt

@@ -1,6 +1,8 @@
 package org.jetbrains.kotlin.tools.projectWizard.wizard.ui.components
 
 import com.intellij.ui.components.JBTextField
+import com.intellij.util.ui.JBUI
+import com.intellij.util.ui.UIUtil
 import org.jetbrains.kotlin.tools.projectWizard.core.Context
 import org.jetbrains.kotlin.tools.projectWizard.core.entity.SettingValidator
 import org.jetbrains.kotlin.tools.projectWizard.wizard.ui.textField
@@ -17,11 +19,27 @@ class TextFieldComponent(
     validator,
     onValueUpdate
 ) {
+    private var isDisabled: Boolean = false
+    private var cachedValueWhenDisabled: String? = null
+
     override val uiComponent: JBTextField = textField(initialValue.orEmpty(), ::fireValueUpdated)
 
     override fun updateUiValue(newValue: String) = safeUpdateUi {
         uiComponent.text = newValue
     }
 
-    override fun getUiValue(): String = uiComponent.text
+    fun disable(message: String) {
+        cachedValueWhenDisabled = getUiValue()
+        uiComponent.isEditable = false
+        uiComponent.foreground = UIUtil.getLabelFontColor(UIUtil.FontColor.BRIGHTER)
+        isDisabled = true
+        updateUiValue(message)
+    }
+
+    override fun validate(value: String) {
+        if (isDisabled) return
+        super.validate(value)
+    }
+
+    override fun getUiValue(): String = cachedValueWhenDisabled ?: uiComponent.text
 }

idea/idea-new-project-wizard/src/org/jetbrains/kotlin/tools/projectWizard/wizard/ui/components/UIComponent.kt

@@ -70,7 +70,7 @@ abstract class UIComponent<V : Any>(
         allowEventFiring = allowEventFiringSaved
     }
 
-    fun validate(value: V) {
+    open fun validate(value: V) {
         if (validator == null) return
         if (validationIndicator == null) return
         read {

idea/idea-new-project-wizard/src/org/jetbrains/kotlin/tools/projectWizard/wizard/ui/secondStep/ModuleSettingsComponent.kt

@@ -1,15 +1,18 @@
 package org.jetbrains.kotlin.tools.projectWizard.wizard.ui.secondStep
 
+import com.intellij.ui.components.JBTextField
 import org.jetbrains.kotlin.idea.projectWizard.UiEditorUsageStats
 import org.jetbrains.kotlin.tools.projectWizard.core.Context
 import org.jetbrains.kotlin.tools.projectWizard.core.Reader
 import org.jetbrains.kotlin.tools.projectWizard.core.entity.StringValidators
 import org.jetbrains.kotlin.tools.projectWizard.moduleConfigurators.getConfiguratorSettings
 import org.jetbrains.kotlin.tools.projectWizard.moduleConfigurators.moduleType
+import org.jetbrains.kotlin.tools.projectWizard.plugins.kotlin.KotlinPlugin
 import org.jetbrains.kotlin.tools.projectWizard.plugins.kotlin.ModuleType
 import org.jetbrains.kotlin.tools.projectWizard.plugins.templates.TemplatesPlugin
 import org.jetbrains.kotlin.tools.projectWizard.settings.buildsystem.Module
 import org.jetbrains.kotlin.tools.projectWizard.settings.buildsystem.Module.Companion.ALLOWED_SPECIAL_CHARS_IN_MODULE_NAMES
+import org.jetbrains.kotlin.tools.projectWizard.settings.buildsystem.isRootModule
 import org.jetbrains.kotlin.tools.projectWizard.templates.Template
 import org.jetbrains.kotlin.tools.projectWizard.templates.settings
 import org.jetbrains.kotlin.tools.projectWizard.wizard.ui.DynamicComponent
@@ -62,7 +65,7 @@ class ModuleSettingsComponent(
         }
 }
 
-private class ModuleNameComponent(context: Context, module: Module) : TitledComponent(context) {
+private class ModuleNameComponent(context: Context, private val module: Module) : TitledComponent(context) {
     private val textField = TextFieldComponent(
         context,
         labelText = null,
@@ -78,6 +81,14 @@ private class ModuleNameComponent(context: Context, module: Module) : TitledComp
 
     override val title: String = "Name"
 
+    override fun onInit() {
+        super.onInit()
+        val isSingleRootMode = read { KotlinPlugin::modules.settingValue }.size == 1
+        if (isSingleRootMode && module.isRootModule) {
+            textField.disable("[The same as the project name]")
+        }
+    }
+
     companion object {
         private val validateModuleName =
             StringValidators.shouldNotBeBlank("Module name") and