C# FrameworkTemplate.LoadContent方法代码示例

        private ContainerVisual GetHeaderFooterVisualFromDataTemplate(FrameworkTemplate template, Rect container)
        {
            if (template == null)
            {
                return null;
            }

            var doc = Source as PrintableDocument;

            var content = template.LoadContent() as FrameworkElement;
            content.DataContext = doc.DataContext;

            var width = _definition.PageSize.Width - _definition.Margins.Left - _definition.Margins.Right;

            content.Measure(_definition.PageSize);
            content.Arrange(new Rect(container.X, container.Y, width, content.DesiredSize.Height));
            content.UpdateLayout();

            var visual = new ContainerVisual();

            visual.Children.Add(content);

            return visual;
        }

        private Size GetModelContentSize(object dataModel, FrameworkTemplate modelTemplate, Size availableSize)
        {
            FrameworkElement content = null;

            if (modelTemplate == null)
            {
                return Size.Empty;
            }

            content = modelTemplate.LoadContent() as FrameworkElement;

            if (content == null)
            {
                return Size.Empty;
            }

            content.DataContext = dataModel;
            content.Measure(availableSize);

            return content.DesiredSize;
        }

//.........这里部分代码省略.........
                if (feContainer != null && EventTrace.IsEnabled(EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose))
                {
                    string label = feContainer.Name;
                    if (label == null || label.Length == 0)
                        label = container.GetHashCode().ToString(System.Globalization.CultureInfo.InvariantCulture);

                    EventTrace.EventProvider.TraceEvent(EventTrace.Event.WClientParseInstVisTreeEnd, EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose,
                                                         String.Format(System.Globalization.CultureInfo.InvariantCulture, "Style.InstantiateSubTree for {0} {1}", container.GetType().Name, label));
                }
            }

            // It's not a FEF-style template, is it a non-empty optimized one?

            else if (frameworkTemplate != null && frameworkTemplate.HasXamlNodeContent)
            {
                // Yes, create from the optimized template content.
                EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose, EventTrace.Event.WClientParseInstVisTreeBegin);

                CheckForCircularReferencesInTemplateTree(container, frameworkTemplate );

                // Container is considered ChildIndex '0' (Self), but,
                // Container.ChildIndex isn't set

                List<DependencyObject> affectedChildren = new List<DependencyObject>(lastChildIndex);

                // Assign affectedChildren to container

                TemplatedFeChildrenField.SetValue(container, affectedChildren);

                DependencyObject treeRoot;

                // Load the content

                treeRoot = frameworkTemplate.LoadContent( container, affectedChildren);

                Debug.Assert(treeRoot == null || treeRoot is FrameworkElement || treeRoot is FrameworkContentElement,
                    "Root node of tree must be a FrameworkElement or FrameworkContentElement.  This should have been caught by set_VisualTree" );

                visualsCreated = true;

                if (feContainer != null && EventTrace.IsEnabled(EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose))
                {
                    string label = feContainer.Name;
                    if (label == null || label.Length == 0)
                        label = container.GetHashCode().ToString(System.Globalization.CultureInfo.InvariantCulture);

                    EventTrace.EventProvider.TraceEvent(EventTrace.Event.WClientParseInstVisTreeEnd, EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose,
                                                         String.Format(System.Globalization.CultureInfo.InvariantCulture, "Style.InstantiateSubTree for {0} {1}", container.GetType().Name, label));
                }
            }

            // No template was supplied.  Allow subclasses to provide the template.
            // This is currently only implemented for FrameworkElement's.

            else
            {
                if (feContainer != null)
                {
                    // This template will not be driven by the Style in any way.
                    // Rather, it will be built and initialized by the callee

                    // CALLBACK
#if DEBUG
                    Debug.Assert( feContainer._buildVisualTreeVerification == VerificationState.WaitingForBuildVisualTree,
                        "The BuildVisualTree override has triggered another call to itself.  This is not good - something between the two Style.InstantiateSubTree calls on the stack is doing A Very Bad Thing.");
                    feContainer._buildVisualTreeVerification = VerificationState.WaitingForAddCustomTemplateRoot;