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At this point, the DSL should display nicely inside the form Now you ll probably want to access the store contents from buttons and so on, on the form:
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private void button1_Click(object sender, EventArgs e) { ExampleModel modelRoot = thisdocViewCurrentDiagramModelElement as ExampleModel; foreach (ExampleElement element in modelRootElements) { listBox1ItemsAdd(elementName); } }
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To make cut, copy, and paste work on your DSL, you need to do the following: Write a copy and/or cut handler to push serialized elements onto the clipboard Write a paste handler to get things from the clipboard Register the menu handlers The handlers should be added as custom code to the DslPackage project
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The Copy Method Copy and paste work by storing an element group prototype (EGP) on the clipboard We met EGPs in the discussion of custom tools, where an EGP containing several objects can be placed in the toolbox, and the Copy() method is very similar to toolbox initialization (see 5) Let s rst look at what the methods do, and then discuss where to put them and how they are invoked The Copy() method looks through all the items in the current selection and picks out those that present items of interest Of course, the selection contains shapes and connectors, so we need to look at the corresponding ModelElements This example is drawn from the circuit diagrams example we looked at earlier in which the transistors, resistors, and so on all have Component as their common base class The AddGraph() method automatically adds embedded children (ComponentTerminals in this case), together
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10: Advanced DSL Customization
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with the links to them (Recall also the Add() method that can be used to add elements one by one) Once an ElementGroup has been constructed, it is turned into a Prototype and serialized onto the clipboard The Cut() method (which you might like to try!) will do essentially the same as Copy(), but is followed by deleting the selection The most general way of doing this is to apply the MergeDisconnect() method that we discussed earlier
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internal partial class CircuitsCommandSet { internal void OnMenuCopy(object sender, EventArgs e) { Diagram diagram = thisCurrentDocViewCurrentDiagram; bool foundSome = false; ElementGroup elementGroup = new ElementGroup(diagramPartition); foreach (object o in thisCurrentSelection) { // Pick out shapes representing Component model elements ShapeElement element = o as ShapeElement; if (element != null && elementModelElement != null && elementModelElement is Component) { // add the element and its embedded children to the group elementGroupAddGraph(elementModelElement, true); foundSome = true; } } if (!foundSome) return; // A DataObject carries a serialized version SystemWindowsFormsIDataObject data = new SystemWindowsFormsDataObject(); dataSetData(elementGroupCreatePrototype()); SystemWindowsFormsClipboardSetDataObject (data, // serialized clones of our selected model elements false, // we don't want to export outside this application 10, // retry 10 times on failure 50); // waiting 50ms between retries } }
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The Paste Method The Paste() method extracts the data from the clipboard, tests whether it can be merged, and if so, merges it within a transaction
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internal void OnMenuPaste(object sender, EventArgs e) { Diagram diagram = thisCurrentDocViewCurrentDiagram; if (diagram == null) return; SystemWindowsFormsIDataObject data = SystemWindowsFormsClipboardGetDataObject(); DesignSurfaceElementOperations op = diagramElementOperations; if (opCanMerge(diagram, data)) { // Find a suitable place to position the new shape PointD place = new PointD(0,0); foreach (object item in thisCurrentSelection) { ShapeElement shape = item as ShapeElement; if (shape != null) { place = shapeAbsoluteBoundingBoxCenter; break; } } using (Transaction t = diagramStore TransactionManagerBeginTransaction("paste")) { // Do the business opMerge(diagram, data, PointDToPointF(place)); tCommit(); } } }
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There are a couple of surprises here First, we are merging into the diagram not the model root even though it was model elements that we saved to the clipboard rather than shapes The second surprise is that this works! The reason we want to merge into the diagram is that it gives us some control over where the new shapes will appear In this example, we place the new shape s top left corner over the center of the current selection The reason it works is that we are using the utility class DesignSurfaceElementOperations to supervise the merge It knows about the PresentationViewsSubject relationship and the view xup rule, and can locate the shapes created from the model elements It can also handle merging into the model root if we prefer, and in that case would nd some spare space on the diagram to put the new shapes It also ensures that the new elements have new names (because our DSL de nition marks the Name property with the Is Element Name ag)
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