bundles/winterwell.markdown/src/winterwell/markdown/views/MarkdownPreview.java

   1 package winterwell.markdown.views;
   2
   3
   4 import java.io.File;
   5 import java.net.URI;
   6
   7 import org.eclipse.core.runtime.IPath;
   8 import org.eclipse.swt.SWT;
   9 import org.eclipse.swt.browser.Browser;
  10 import org.eclipse.swt.widgets.Composite;
  11 import org.eclipse.ui.IEditorPart;
  12 import org.eclipse.ui.IPathEditorInput;
  13 import org.eclipse.ui.part.ViewPart;
  14
  15 import winterwell.markdown.editors.ActionBarContributor;
  16 import winterwell.markdown.editors.MarkdownEditor;
  17 import winterwell.markdown.pagemodel.MarkdownPage;
  18
  19
  20
  21
  22 public class MarkdownPreview extends ViewPart {
  23
  24         public static MarkdownPreview preview = null;
  25
  26         private Browser viewer = null;
  27
  28         /**
  29          * The constructor.
  30          */
  31         public MarkdownPreview() {
  32                 preview = this;
  33         }
  34
  35         /**
  36          * This is a callback that will allow us
  37          * to create the viewer and initialize it.
  38          */
  39         @Override
  40         public void createPartControl(Composite parent) {
  41                 viewer = new Browser(parent, SWT.MULTI); // | SWT.H_SCROLL | SWT.V_SCROLL
  42         }
  43
  44
  45
  46
  47         /**
  48          * Passing the focus request to the viewer's control.
  49          */
  50         @Override
  51         public void setFocus() {
  52                 if (viewer==null) return;
  53                 viewer.setFocus();
  54                 update();
  55         }
  56
  57         public void update() {
  58                 if (viewer==null) return;
  59                 try {
  60                         IEditorPart editor = ActionBarContributor.getActiveEditor();
  61                         if (!(editor instanceof MarkdownEditor)) {
  62                                 viewer.setText("");
  63                                 return;
  64                         }
  65                         MarkdownEditor ed = (MarkdownEditor) editor;
  66                         MarkdownPage page = ed.getMarkdownPage();
  67                         String html = page.html();
  68                         html = addBaseURL(editor, html);
  69                         if (page != null) viewer.setText(html);
  70                         else viewer.setText("");
  71                 } catch (Exception ex) {
  72                         // Smother
  73                         System.out.println(ex);
  74
  75                         if (viewer != null && !viewer.isDisposed())
  76                                 viewer.setText(ex.getMessage());
  77                 }
  78         }
  79
  80         /**
  81          * Adjust the URL base to be the file's directory.
  82          * @param editor
  83          * @param html
  84          * @return
  85          */
  86         private String addBaseURL(IEditorPart editor, String html) {
  87         try {
  88                 IPathEditorInput input = (IPathEditorInput) editor.getEditorInput();
  89                 IPath path = input.getPath();
  90                 path = path.removeLastSegments(1);
  91                 File f = path.toFile();
  92                 URI fileURI = f.toURI();
  93                 String html2 = "<html><head><base href='"+fileURI+"' /></head><body>\r\n"+html
  94                 +"\r\n</body></html>";
  95                 return html2;
  96         } catch (Exception ex) {
  97                 return html;
  98         }
  99         }
 100 }