MarkdownPreviewFileEditorProvider.java

package org.intellij.plugins.markdown.ui.preview;

import com.intellij.ide.scratch.ScratchFileService;
import com.intellij.ide.scratch.ScratchFileType;
import com.intellij.openapi.fileEditor.FileEditor;
import com.intellij.openapi.fileEditor.FileEditorPolicy;
import com.intellij.openapi.fileEditor.WeighedFileEditorProvider;
import com.intellij.openapi.fileTypes.FileType;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import org.intellij.plugins.markdown.lang.MarkdownFileType;
import org.intellij.plugins.markdown.lang.MarkdownLanguage;
import org.jetbrains.annotations.NotNull;

public class MarkdownPreviewFileEditorProvider extends WeighedFileEditorProvider {
  @Override
  public boolean accept(@NotNull Project project, @NotNull VirtualFile file) {
    final FileType fileType = file.getFileType();
    return fileType == MarkdownFileType.INSTANCE ||
           fileType == ScratchFileType.INSTANCE && ScratchFileService.getInstance().getScratchesMapping().getMapping(file) ==
                                                   MarkdownLanguage.INSTANCE;
  }

  @NotNull
  @Override
  public FileEditor createEditor(@NotNull Project project, @NotNull VirtualFile file) {
    return new MarkdownPreviewFileEditor(file);
  }

  @NotNull
  @Override
  public String getEditorTypeId() {
    return "markdown-preview-editor";
  }

  @NotNull
  @Override
  public FileEditorPolicy getPolicy() {
    return FileEditorPolicy.PLACE_AFTER_DEFAULT_EDITOR;
  }
}