bundles/org.simantics.document.swt.core/src/org/simantics/document/swt/core/base/WidgetContainer.java

   1 package org.simantics.document.swt.core.base;
   2
   3 import org.eclipse.swt.widgets.Composite;
   4 import org.eclipse.swt.widgets.Control;
   5 import org.simantics.document.server.JSONObject;
   6 import org.simantics.document.server.client.WidgetData;
   7 import org.simantics.document.swt.core.SWTDocument;
   8
   9 public abstract class WidgetContainer<C extends Control> {
  10
  11         C control;
  12
  13         abstract protected Control doCreateControl(SWTDocument document, Composite parent, JSONObject object);
  14         abstract protected void doUpdateProperties(SWTDocument document, Control control, JSONObject object);
  15
  16         @SuppressWarnings("unchecked")
  17         public void createControl(SWTDocument document, Composite parent, final JSONObject object) {
  18                 control = (C)doCreateControl(document, parent, object);
  19                 if(control == null) {
  20                         new Exception().printStackTrace();
  21                         return;
  22                 }
  23                 doUpdateProperties(document, control, object);
  24         }
  25
  26         public C getControl() {
  27                 return (C)control;
  28         }
  29
  30         @SuppressWarnings("unchecked")
  31         public <T> T getOrCreateControl(SWTDocument document, JSONObject object) {
  32                 if(control == null || control.isDisposed()) {
  33                         String parentId = object.getJSONField("parent");
  34                         WidgetData parent = document.getWidget(parentId);
  35                         if(parent != null) {
  36                                 WidgetContainer<?> parentContainer = (WidgetContainer<?>)parent.widget;
  37                                 Composite pc = (Composite)parentContainer.getOrCreateControl(document, parent.object);
  38                                 // TODO: pc may be disposed, how to handle this and why is it happening?
  39                                 if(pc != null && !pc.isDisposed())
  40                                         createControl(document, pc, object);
  41                         }
  42                 }
  43                 return (T)control;
  44         }
  45
  46         public void updateProperties(SWTDocument document, JSONObject object) {
  47                 if(control != null) {
  48                         doUpdateProperties(document, control, object);
  49                 }
  50         }
  51
  52 }