c# - 在图表屏幕上居中 DSL 形状

Question

首先，对不起我的英语。

我正在开发 DSL。在主窗口中，我有两个面板：形状列表和图表本身。当单击列表中的某个项目时，我希望将其形状置于屏幕（图表面板）的中心。

我不想将形状移动到图表的中心。我想滚动图表以使形状居中。

另一种解释方式：当发生验证错误时（底部的错误列表窗口），当点击错误时，它会在屏幕上居中显示无效形状，对吗？这就是我想要的。

起点：

private void symbolsListBox_SelectedIndexChanged(object sender, EventArgs e)
{
    var listBox = sender as ListBox;
    var symbol = listBox.SelectedItem as Symbol;
    var compartment = PresentationViewsSubject.GetPresentation(symbol)
        .FirstOrDefault() as SymbolCompartmentShape;
    var diagram = docView.CurrentDiagram;

    //Next step, center the shape
    //How? God please help me!!!
}

图片示例总是更好！所以...

在这里，我想要的示例图像

此处是预期结果的示例图像

Answer 1

您可以做的是在图表中找到形状并选择它。如有必要，图表将自动使其可见。

这是我使用的代码。请注意，这从 ModelElement（不是形状）开始。

valueListAssociation.LocateInDiagram();

现在扩展方法：

public static bool LocateInDiagram(this ModelElement element)
{
    // Validation

    SmartGuard.NotNull(() => element, element);

    // Get the diagram view

    DiagramView diagramView = element.GetActiveDiagramView();
    if (diagramView != null)
    {
        // Select it

        return diagramView.SelectModelElement(element);
    }

    // Default result

    return false;
}

public static DiagramView GetActiveDiagramView(this ModelElement element)
{
    // Validation

    SmartGuard.NotNull(() => element, element);

    // Get the shape that corresponds to this model element

    ShapeElement shapeElement = element.GetShapeElement();
    if (shapeElement != null)
    {
        // Result

        return shapeElement.GetActiveDiagramView();
    }

    // Default result

    return null;
}

public static ShapeElement GetShapeElement(this ModelElement element)
{
    // Validation

    SmartGuard.NotNull(() => element, element);

    // Get the first shape
    // If the model element is in a compartment the result will be null

    ShapeElement shape = element.GetFirstShapeElement();
    if (shape == null)
    {
        // If the element is in a compartment, try to get the parent model element to select that

        ModelElement parentElement = element.GetCompartmentElementFirstParentElement();
        if (parentElement != null)
        {
            shape = parentElement.GetFirstShapeElement();
        }
    }

    // Result

    return shape;
}

private static ShapeElement GetFirstShapeElement(this ModelElement element)
{
    // Presentation elements

    LinkedElementCollection<PresentationElement> presentations = PresentationViewsSubject.GetPresentation(element);
    foreach (PresentationElement presentation in presentations)
    {
        ShapeElement shapeElement = presentation as ShapeElement;
        if (shapeElement != null)
        {
            return shapeElement;
        }
    }

    // Default result

    return null;
}

private static ModelElement GetCompartmentElementFirstParentElement(this ModelElement modelElement)
{
    // Get the domain class associated with model element.

    DomainClassInfo domainClass = modelElement.GetDomainClass();
    if (domainClass != null)
    {
        // A element is only considered to be in a compartment if it participates in only 1 embedding relationship
        // This might be wrong for some models

        if (domainClass.AllEmbeddedByDomainRoles.Count == 1)
        {
            DomainRoleInfo roleInfo = domainClass.AllEmbeddedByDomainRoles[0];
            if (roleInfo != null)
            {
                // Get a collection of all the links to this model element
                // Since this is in a compartment there should be at least one
                // There can be only one.

                ReadOnlyCollection<ElementLink> links = roleInfo.GetElementLinks(modelElement);
                if (links.Count == 1)
                {
                    // Get the model element participating in the link that isn't the current one
                    // That will be the parent
                    // Probably there is a better way to achieve the same result

                    foreach (ModelElement linkedElement in links[0].LinkedElements)
                    {
                        if (!modelElement.Equals(linkedElement))
                        {
                            return linkedElement;
                        }
                    }
                }
            }
        }
    }

    // Default result

    return null;
}

public static DiagramView GetActiveDiagramView(this ShapeElement shape)
{
    // Validation

    SmartGuard.NotNull(() => shape, shape);

    // Result

    if (shape.Diagram != null)
    {
        return shape.Diagram.ActiveDiagramView;
    }

    // Default result

    return null;
}

public static bool SelectModelElement(this DiagramView diagramView, ModelElement modelElement, bool ensureVisible)
{
    // Validation

    SmartGuard.NotNull(() => diagramView, diagramView);
    SmartGuard.NotNull(() => modelElement, modelElement);

    // Get the shape element that corresponds to the model element

    ShapeElement shapeElement = modelElement.GetPresentation<ShapeElement>();
    if (shapeElement != null)
    {
        // Make sure the shape element is visible (because connectors can be hidden)

        if (!shapeElement.IsVisible)
        {
            shapeElement.Show();
        }

        // Create a diagram item for this shape element and select it

        diagramView.SelectDiagramItem(new DiagramItem(shapeElement), ensureVisible);
        return true;
    }

    // If the model element does not have a shape, try to cast it IModelElementCompartmented

    IModelElementCompartmented compartmentedModelElement = modelElement as IModelElementCompartmented;
    if (compartmentedModelElement != null)
    {
        // Get the parent

        IModelElementWithCompartments parentModelElement = compartmentedModelElement.ParentModelElement;
        if (parentModelElement != null)
        {
            // Get the compartment that stores the model element

            ElementListCompartment compartment = parentModelElement.GetCompartment(compartmentedModelElement.CompartmentName);
            if (compartment == null)
            {
                throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Properties.Resources.RES_Error_CannotFindCompartment, compartmentedModelElement.CompartmentName));
            }

            // Expand the compartment?

            if (!compartment.IsExpanded)
            {
                using (Transaction trans = modelElement.Store.TransactionManager.BeginTransaction("IsExpanded"))
                {
                    compartment.IsExpanded = true;
                    trans.Commit();
                }
            }

            // Find the model element in the compartment

            int index = compartment.Items.IndexOf(modelElement);
            if (index >= 0)
            {
                // Create a diagram item and select it

                diagramView.SelectDiagramItem(new DiagramItem(compartment, compartment.ListField, new ListItemSubField(index)), ensureVisible);

                // Result OK

                return true;
            }
        }
    }

    // Default result

    return false;
}

请注意，最后一个方法有一个“技巧”来处理具有隔间的形状 (IModelElementCompartmented)。如果您的形状没有隔间，您可以省略这部分。