public CaseDesigner()
{
this.InitializeComponent();
this.DragHandle = null;
this.Loaded += (sender, e) =>
{
Selection selection = this.Context.Items.GetValue <Selection>();
if (selection != null)
{
ModelItem primarySelection = selection.PrimarySelection;
this.ExpandState = SwitchDesigner.IsDescendantOfCase(this.ModelItem, primarySelection);
if (this.ExpandState)
{
// If current focus is at another part, we need to focus this designer
// to trigger selection changed, then this part will expand and another
// expanded part will collapse. Then we focus on the activity it contains
// if there is one.
this.ModelItem.Highlight();
if (this.ModelItem != primarySelection && primarySelection.View != null)
{
primarySelection.Highlight();
}
}
}
};
}
void OnModelItemPropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == "Expression")
{
Update();
}
else if (e.PropertyName == "DefaultCaseDisplayName")
{
// To fix 218600 without losing PropertyGrid focus (Bug 210326), the only workaround is to
// update the connector label manually, because FlowSwitchLink.ModelItem["DefaultCaseDisplayName"]
// is a FakeModelPropertyImpl, and would not generate a Undo unit
// (FakeModelNotifyPropertyChange.GetInverse() returns null).
// However, there is a known issue with PropertyGrid bound to a fake ModelItem. The workaround is
// to shift the focus to the FlowchartDesigner IF the keyboard focus is on the connector when the user
// calls Undo/Redo, to avoid the problem of PropertyGrid not refreshable.
FlowchartDesigner flowchartDesigner = VisualTreeUtils.FindVisualAncestor <FlowchartDesigner>(this);
Fx.Assert(null != flowchartDesigner, "flowchart designer cannot be null because FlowswitchDesigner must exist within the same visual tree ofthe parent Flowchart.");
if (null != flowchartDesigner &&
null != this.ModelItem.Properties["Default"].Value &&
this.Context.Services.GetService <UndoEngine>().IsUndoRedoInProgress)
{
// the designer is available
Connector connector = flowchartDesigner.GetLinkOnCanvas(this.ModelItem, this.ModelItem.Properties["Default"].Value, "Default");
Fx.Assert(null != connector, "Connector should not be null.");
ModelItem linkModelItem = FlowchartDesigner.GetLinkModelItem(connector);
Fx.Assert(linkModelItem is FakeModelItemImpl, "ModelItem of FlowSwitch link is fake.");
IFlowSwitchDefaultLink link = (IFlowSwitchDefaultLink)linkModelItem.GetCurrentValue();
string defaultDisplayName =
(string)this.ModelItem.Properties[FlowSwitchLabelFeature.DefaultCaseDisplayNamePropertyName].Value.GetCurrentValue();
if (link.DefaultCaseDisplayName != defaultDisplayName)
{
// the purpose of re-setting the link value during Undo/Redo is to update the FlowSwitch label
using (ModelEditingScope scope = this.ModelItem.BeginEdit(SR.FlowSwitchDefaultCaseDisplayNameEditingScopeDesc))
{
linkModelItem.Properties[FlowSwitchLabelFeature.DefaultCaseDisplayNamePropertyName].SetValue(defaultDisplayName);
link.DefaultCaseDisplayName = defaultDisplayName;
scope.Complete();
}
if (Selection.IsSelection(linkModelItem))
{
// cause the connector to lose focus, because the PropertyGrid would not have focus.
// this scenario only happens if the user explicitly selects the FlowSwitch link after
// editing the DefaultDisplayName. This behavior is only a workaround due to the fact
// that PropertyGrid does not receive update from change in a FakeModelPropertyImpl
// (i.e. FlowSwitchLink).
Keyboard.ClearFocus();
Selection.SelectOnly(this.Context, this.ModelItem);
linkModelItem.Highlight();
}
}
}
}
}
private void HighlightModelItemOnDesigner(ModelItem selectedModelItem)
{
if (selectedModelItem != null)
{
Selection.SelectOnly(this.ParentTreeView.Context, selectedModelItem);
// Set highlight to visual value.
// Don't use "Focus()" since it will steal keyboard focus and disable
// keyboard navigation.
selectedModelItem.Highlight();
}
}