ui: show all available test panels in internal showcase dialog

GitOrigin-RevId: 0333401d33f0cc0584f8e51ac2190627981640c0

platform/platform-impl/src/com/intellij/ui/layout/ShowcaseUiDslAction.kt

@@ -1,24 +1,38 @@
 // Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.ui.layout
 
+import com.google.common.base.CaseFormat
 import com.intellij.openapi.actionSystem.AnActionEvent
 import com.intellij.openapi.project.DumbAwareAction
 import com.intellij.openapi.util.Disposer
 import com.intellij.ui.components.dialog
 import com.intellij.ui.tabs.JBTabsFactory
 import com.intellij.ui.tabs.TabInfo
+import javax.swing.JPanel
+import kotlin.reflect.jvm.kotlinFunction
 
 // not easy to replicate the same LaF outside of IDEA app, so, to be sure, showcase available as an IDE action
 internal class ShowcaseUiDslAction : DumbAwareAction() {
   override fun actionPerformed(e: AnActionEvent) {
     val disposable = Disposer.newDisposable()
     val tabs = JBTabsFactory.createEditorTabs(e.project, disposable)
-    tabs.presentation.setAlphabeticalMode(false)
+    tabs.presentation.setSupportsCompression(false)
+    tabs.presentation.setAlphabeticalMode(true)
 
-    tabs.addTab(TabInfo(secondColumnSmallerPanel()).setText("Second Column Smaller"))
-    tabs.addTab(TabInfo(rowWithIndent()).setText("Row with Indent"))
+    val clazz = Class.forName("com.intellij.ui.layout.TestPanelsKt")
+    for (declaredMethod in clazz.declaredMethods) {
+      val method = declaredMethod.kotlinFunction!!
+      if (method.returnType.classifier == JPanel::class && method.parameters.isEmpty()) {
+        val panel = method.call() as JPanel
+        val text = CaseFormat.LOWER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, method.name)
+          .replace("_", " ").capitalize().removeSuffix(" Panel")
+        tabs.addTab(TabInfo(panel).setText(text))
+      }
+    }
 
-    val dialog = dialog("UI DSL Showcase", tabs.component)
+    tabs.select(tabs.tabs.first(), false)
+
+    val dialog = dialog("UI DSL Showcase", tabs.component, resizable = true)
     Disposer.register(dialog.disposable, disposable)
     dialog.showAndGet()
   }

platform/platform-impl/src/com/intellij/ui/layout/testPanels.kt

@@ -10,6 +10,10 @@ import java.awt.Dimension
 import java.awt.GridLayout
 import javax.swing.*
 
+/**
+ * See [ShowcaseUiDslAction]
+ */
+
 fun labelRowShouldNotGrow(): JPanel {
   return panel {
     row("Create Android module") { CheckBox("FooBar module name foo")() }