initial commit

src/main/kotlin/MyMessageBundle.kt

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+package dev.hgh
+
+import com.intellij.DynamicBundle
+import org.jetbrains.annotations.Nls
+import org.jetbrains.annotations.PropertyKey
+import java.util.function.Supplier
+
+private const val BUNDLE = "messages.MyMessageBundle"
+
+internal object MyMessageBundle {
+    private val instance = DynamicBundle(MyMessageBundle::class.java, BUNDLE)
+
+    @JvmStatic
+    fun message(key: @PropertyKey(resourceBundle = BUNDLE) String, vararg params: Any?): @Nls String {
+        return instance.getMessage(key, *params)
+    }
+
+    @JvmStatic
+    fun lazyMessage(@PropertyKey(resourceBundle = BUNDLE) key: String, vararg params: Any?): Supplier<@Nls String> {
+        return instance.getLazyMessage(key, *params)
+    }
+}

src/main/kotlin/MyToolWindowFactory.kt

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+package dev.hgh
+
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.wm.ToolWindow
+import com.intellij.openapi.wm.ToolWindowFactory
+import com.intellij.ui.components.JBLabel
+import com.intellij.ui.components.JBPanel
+import com.intellij.ui.content.ContentFactory
+import javax.swing.JButton
+import kotlin.random.Random
+
+class MyToolWindowFactory : ToolWindowFactory {
+    override fun shouldBeAvailable(project: Project) = true
+
+    override fun createToolWindowContent(project: Project, toolWindow: ToolWindow) {
+        val myToolWindow = MyToolWindow()
+        val content = ContentFactory.getInstance().createContent(myToolWindow.getContent(), null, false)
+        toolWindow.contentManager.addContent(content)
+    }
+
+    class MyToolWindow {
+        private val content = JBPanel<JBPanel<*>>().apply {
+            val label = JBLabel(MyMessageBundle.message("toolwindow.MyToolWindow.number.label", "?"))
+
+            add(label)
+            add(JButton(MyMessageBundle.message("toolwindow.MyToolWindow.shuffle.button")).apply {
+                addActionListener {
+                    label.text = MyMessageBundle.message(
+                        "toolwindow.MyToolWindow.number.label", Random(System.currentTimeMillis()).nextInt(1000)
+                    )
+                }
+            })
+        }
+
+        fun getContent(): JBPanel<JBPanel<*>> = content
+    }
+}