IJP-755 load what's new from jb.com right into editor

GitOrigin-RevId: 2faca6e424af2151336c89e0f62a24631f462431

platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/HTMLEditorProvider.kt

@@ -11,7 +11,7 @@ import com.intellij.openapi.util.KeyWithDefaultValue
 import com.intellij.openapi.vfs.VirtualFile
 
 class HTMLEditorProvider : FileEditorProvider, DumbAware {
-  override fun createEditor(project: Project, file: VirtualFile): FileEditor = HTMLFileEditor(file)
+  override fun createEditor(project: Project, file: VirtualFile): FileEditor = HTMLFileEditor()
 
   override fun accept(project: Project, file: VirtualFile) = file.getUserData(HTML_CONTENT_TYPE)!!
 

platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/HTMLFileEditor.kt

@@ -1,31 +1,60 @@
 // 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.openapi.fileEditor.impl
 
+import com.intellij.CommonBundle
+import com.intellij.ide.plugins.MultiPanel
+import com.intellij.openapi.application.invokeLater
 import com.intellij.openapi.fileEditor.FileEditor
 import com.intellij.openapi.fileEditor.FileEditorLocation
 import com.intellij.openapi.fileEditor.FileEditorState
 import com.intellij.openapi.util.Key
-import com.intellij.openapi.vfs.VfsUtil
-import com.intellij.openapi.vfs.VirtualFile
-import com.intellij.ui.ScrollPaneFactory
-import com.intellij.util.ui.JBUI
-import com.intellij.util.ui.UIUtil
+import com.intellij.ui.components.JBLoadingPanel
+import com.intellij.ui.jcef.JCEFHtmlPanel
+import org.cef.browser.CefBrowser
+import org.cef.handler.CefLoadHandlerAdapter
+import java.awt.BorderLayout
 import java.beans.PropertyChangeListener
-import javax.swing.JComponent
-import javax.swing.JEditorPane
 
-class HTMLFileEditor(private val vFile: VirtualFile) : FileEditor {
-  private val component: JComponent =
-    ScrollPaneFactory.createScrollPane(
-      JEditorPane().also {
-        it.editorKit = UIUtil.getHTMLEditorKit()
-        it.text = VfsUtil.loadText(vFile)
-        it.border = JBUI.Borders.empty(8, 12)
-        it.isEditable = false
-      })
+class HTMLFileEditor : FileEditor {
+  private val htmlPanelComponent = JCEFHtmlPanel(null)
+  private val loadingPanel = JBLoadingPanel(BorderLayout(), this).apply { setLoadingText(CommonBundle.getLoadingTreeNodeText()) }
 
-  override fun getComponent(): JComponent = component
-  override fun getPreferredFocusedComponent() = component
+  private val multiPanel: MultiPanel = object : MultiPanel() {
+    override fun create(key: Int) = when (key) {
+      LOADING_KEY -> loadingPanel
+      CONTENT_KEY -> htmlPanelComponent.component
+      else -> throw UnsupportedOperationException("Unknown key")
+    }
+  }
+
+  var url: String = "about:blank"
+    set(value) {
+      field = value
+      htmlPanelComponent.loadURL(value)
+      multiPanel.select(CONTENT_KEY, true)
+    }
+
+  init {
+    htmlPanelComponent.jbCefClient.addLoadHandler(object : CefLoadHandlerAdapter() {
+      override fun onLoadingStateChange(browser: CefBrowser?, isLoading: Boolean, canGoBack: Boolean, canGoForward: Boolean) {
+        if (isLoading) {
+          invokeLater {
+            loadingPanel.startLoading()
+            multiPanel.select(LOADING_KEY, true)
+          }
+        }
+        else {
+          invokeLater {
+            loadingPanel.stopLoading()
+            multiPanel.select(CONTENT_KEY, true)
+          }
+        }
+      }
+    }, htmlPanelComponent.cefBrowser)
+  }
+
+  override fun getComponent() = multiPanel
+  override fun getPreferredFocusedComponent() = multiPanel
   override fun getName() = "HTML Preview"
   override fun setState(state: FileEditorState) {}
   override fun isModified(): Boolean = false
@@ -36,4 +65,9 @@ class HTMLFileEditor(private val vFile: VirtualFile) : FileEditor {
   override fun removePropertyChangeListener(listener: PropertyChangeListener) {}
   override fun getCurrentLocation(): FileEditorLocation? = null
   override fun dispose() {}
+
+  companion object {
+    const val LOADING_KEY = 1
+    const val CONTENT_KEY = 0
+  }
 }

platform/platform-impl/src/com/intellij/openapi/updateSettings/impl/UpdateInfoDialog.java

@@ -13,8 +13,10 @@ import com.intellij.openapi.application.*;
 import com.intellij.openapi.application.ex.ApplicationEx;
 import com.intellij.openapi.application.impl.ApplicationImpl;
 import com.intellij.openapi.diagnostic.Logger;
+import com.intellij.openapi.fileEditor.FileEditor;
 import com.intellij.openapi.fileEditor.FileEditorManager;
 import com.intellij.openapi.fileEditor.impl.HTMLEditorProvider;
+import com.intellij.openapi.fileEditor.impl.HTMLFileEditor;
 import com.intellij.openapi.progress.PerformInBackgroundOption;
 import com.intellij.openapi.progress.ProcessCanceledException;
 import com.intellij.openapi.progress.ProgressIndicator;
@@ -32,6 +34,7 @@ import com.intellij.util.SystemProperties;
 import com.intellij.util.containers.ContainerUtil;
 import com.intellij.util.text.DateFormatUtil;
 import com.intellij.util.ui.JBUI;
+import com.intellij.util.ui.UIUtil;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -101,7 +104,11 @@ final class UpdateInfoDialog extends AbstractUpdateDialog {
           String title = IdeBundle.message("update.whats.new.file.name", ApplicationInfo.getInstance().getFullVersion());
           LightVirtualFile file = new LightVirtualFile(title, myNewBuild.getMessage());
           file.putUserData(HTMLEditorProvider.Companion.getHTML_CONTENT_TYPE(), true);
-          FileEditorManager.getInstance(project).openFile(file, true);
+          FileEditor[] fileEditors = FileEditorManager.getInstance(project).openFile(file, true);
+          if (fileEditors.length > 0 && fileEditors[0] instanceof HTMLFileEditor) {
+            ((HTMLFileEditor)fileEditors[0])
+              .setUrl(myNewBuild.getBlogPost() + "/?var=embed" + (UIUtil.isUnderDarcula() ? "&theme=dark" : ""));
+          }
           close(OK_EXIT_CODE);
         }
       };