feat(preview panel): render updated file

build.gradle.kts

@@ -14,6 +14,8 @@ repositories {
     mavenCentral()
     intellijPlatform {
         defaultRepositories()
+
+        jetbrainsRuntime()
     }
 }
 
@@ -26,8 +28,9 @@ dependencies {
             "org.jetbrains.plugins.yaml"
         ))
 
-        instrumentationTools()
         pluginVerifier()
+        jetbrainsRuntime()
+        instrumentationTools()
         testFramework(TestFrameworkType.Platform)
     }
 

src/main/kotlin/com/asyncapi/plugin/idea/extensions/editor/preview/AsyncAPIPreviewEditor.kt

@@ -1,19 +1,24 @@
 package com.asyncapi.plugin.idea.extensions.editor.preview
 
+import com.asyncapi.plugin.idea.extensions.editor.ui.AsyncAPIJCEFHtmlPanel
 import com.intellij.codeHighlighting.BackgroundEditorHighlighter
 import com.intellij.ide.structureView.StructureViewBuilder
 import com.intellij.openapi.editor.Document
 import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.editor.event.DocumentEvent
+import com.intellij.openapi.editor.event.DocumentListener
 import com.intellij.openapi.fileEditor.FileEditor
 import com.intellij.openapi.fileEditor.FileEditorLocation
 import com.intellij.openapi.fileEditor.FileEditorState
 import com.intellij.openapi.fileEditor.FileEditorStateLevel
 import com.intellij.openapi.project.Project
+import com.intellij.openapi.util.Disposer
 import com.intellij.openapi.util.UserDataHolderBase
+import java.awt.LayoutManager
 import java.beans.PropertyChangeListener
 import javax.swing.JComponent
-import javax.swing.JLabel
 import javax.swing.JPanel
+import javax.swing.OverlayLayout
 
 class AsyncAPIPreviewEditor(
     private val document: Document?,
@@ -24,14 +29,35 @@ class AsyncAPIPreviewEditor(
 
     var editor: Editor? = null
 
-    override fun getComponent(): JComponent {
+    private val asyncAPIPreviewEditorComponent: JComponent
+    private val htmlPanel: AsyncAPIJCEFHtmlPanel = AsyncAPIJCEFHtmlPanel(editor)
+
+    init {
+        asyncAPIPreviewEditorComponent = createComponent()
+
+        val documentListenerHandler = object : DocumentListener {
+            override fun documentChanged(event: DocumentEvent) {
+                if (asyncAPIPreviewEditorComponent.isVisible && asyncAPIPreviewEditorComponent.isDisplayable) {
+                    htmlPanel.setHtml("${document?.text}")
+                }
+            }
+        }
+        document?.addDocumentListener(documentListenerHandler, this)
+    }
+
+    private fun createComponent(): JComponent {
         val previewEditor = JPanel()
-        val mockText = JLabel("AsyncAPI Preview Editor")
+        val overlay: LayoutManager = OverlayLayout(previewEditor)
+        previewEditor.setLayout(overlay)
+
+        htmlPanel.setHtml("${document?.text}")
+        previewEditor.add(htmlPanel.component)
 
-        previewEditor.add(mockText)
         return previewEditor
     }
 
+    override fun getComponent(): JComponent = asyncAPIPreviewEditorComponent
+
     override fun getPreferredFocusedComponent(): JComponent = getComponent()
 
     override fun getName(): String = "Preview"
@@ -69,9 +95,7 @@ class AsyncAPIPreviewEditor(
     override fun getStructureViewBuilder(): StructureViewBuilder? = null
 
     override fun dispose() {
-        // TODO: dispose component
-        // Disposer.dispose(previewEditor)
-        // do nothing
+         Disposer.dispose(htmlPanel)
     }
 
 }

src/main/kotlin/com/asyncapi/plugin/idea/extensions/editor/ui/AsyncAPIHtmlPanel.kt

@@ -0,0 +1,12 @@
+package com.asyncapi.plugin.idea.extensions.editor.ui
+
+import com.intellij.openapi.Disposable
+import javax.swing.JComponent
+
+interface AsyncAPIHtmlPanel: Disposable {
+
+    fun getComponent(): JComponent
+
+    fun setHtml(html: String)
+
+}

src/main/kotlin/com/asyncapi/plugin/idea/extensions/editor/ui/AsyncAPIJCEFHtmlPanel.kt

@@ -0,0 +1,17 @@
+package com.asyncapi.plugin.idea.extensions.editor.ui
+
+import com.intellij.openapi.editor.Editor
+import com.intellij.ui.jcef.JCEFHtmlPanel
+import javax.swing.JComponent
+
+class AsyncAPIJCEFHtmlPanel(
+    var editor: Editor?,
+): AsyncAPIHtmlPanel, JCEFHtmlPanel(null) {
+
+    override fun getComponent(): JComponent = super.getComponent()
+
+    override fun setHtml(html: String) {
+        loadHTML(html, cefBrowser.url)
+    }
+
+}