public override bool OnComponentChanging()
{
if (ComponentChangeService != null)
{
int cLength = objs.Length;
for (int i = 0; i < cLength; i++)
{
try {
ComponentChangeService.OnComponentChanging(objs[i], mergedPd[i]);
}
catch (CheckoutException co) {
if (co == CheckoutException.Canceled)
{
return(false);
}
throw co;
}
}
}
return(true);
}
public override bool OnComponentChanging()
{
if (ComponentChangeService is null)
{
return(true);
}
int length = _objects.Length;
for (int i = 0; i < length; i++)
{
try
{
ComponentChangeService.OnComponentChanging(_objects[i], _mergedDescriptor[i]);
}
catch (CheckoutException co) when(co == CheckoutException.Canceled)
{
return(false);
}
}
return(true);
}
private object SetPropertyValue(object obj, object objVal, bool reset, string undoText)
{
DesignerTransaction trans = null;
try
{
object oldValue = GetPropertyValueCore(obj);
if (objVal != null && objVal.Equals(oldValue))
{
return(objVal);
}
ClearCachedValues();
IDesignerHost host = DesignerHost;
if (host != null)
{
string text = (undoText == null ? string.Format(SR.PropertyGridSetValue, propertyInfo.Name) : undoText);
trans = host.CreateTransaction(text);
}
// Usually IComponent things are sited and this notification will be
// fired automatically by the PropertyDescriptor. However, for non-IComponent sub objects
// or sub objects that are non-sited sub components, we need to manuall fire
// the notification.
//
bool needChangeNotify = !(obj is IComponent) || ((IComponent)obj).Site == null;
if (needChangeNotify)
{
try
{
if (ComponentChangeService != null)
{
ComponentChangeService.OnComponentChanging(obj, propertyInfo);
}
}
catch (CheckoutException coEx)
{
if (coEx == CheckoutException.Canceled)
{
return(oldValue);
}
throw coEx;
}
}
bool wasExpanded = this.InternalExpanded;
int childCount = -1;
if (wasExpanded)
{
childCount = this.ChildCount;
}
RefreshPropertiesAttribute refreshAttr = (RefreshPropertiesAttribute)propertyInfo.Attributes[typeof(RefreshPropertiesAttribute)];
bool needsRefresh = wasExpanded || (refreshAttr != null && !refreshAttr.RefreshProperties.Equals(RefreshProperties.None));
if (needsRefresh)
{
DisposeChildren();
}
// Determine if this is an event being created, and if so, navigate to the event code
//
EventDescriptor eventDesc = null;
// This is possibly an event. Check it out.
//
if (obj != null && objVal is string)
{
if (eventBindings == null)
{
eventBindings = (IEventBindingService)GetService(typeof(IEventBindingService));
}
if (eventBindings != null)
{
eventDesc = eventBindings.GetEvent(propertyInfo);
}
// For a merged set of properties, the event binding service won't
// find an event. So, we ask type descriptor directly.
//
if (eventDesc == null)
{
// If we have a merged property descriptor, pull out one of
// the elements.
//
object eventObj = obj;
if (propertyInfo is MergePropertyDescriptor && obj is Array)
{
Array objArray = obj as Array;
if (objArray.Length > 0)
{
eventObj = objArray.GetValue(0);
}
}
eventDesc = TypeDescriptor.GetEvents(eventObj)[propertyInfo.Name];
}
}
bool setSuccessful = false;
try
{
if (reset)
{
propertyInfo.ResetValue(obj);
}
else if (eventDesc != null)
{
ViewEvent(obj, (string)objVal, eventDesc, false);
}
else
{ // Not an event
SetPropertyValueCore(obj, objVal, true);
}
setSuccessful = true;
// Now notify the change service that the change was successful.
//
if (needChangeNotify && ComponentChangeService != null)
{
ComponentChangeService.OnComponentChanged(obj, propertyInfo, null, objVal);
}
NotifyParentChange(this);
}
finally
{
// see if we need to refresh the property browser
// 1) if this property has the refreshpropertiesattribute, or
// 2) it's got expanded sub properties
//
if (needsRefresh && this.GridEntryHost != null)
{
RecreateChildren(childCount);
if (setSuccessful)
{
this.GridEntryHost.Refresh(refreshAttr != null && refreshAttr.Equals(RefreshPropertiesAttribute.All));
}
}
}
}
catch (CheckoutException checkoutEx)
{
if (trans != null)
{
trans.Cancel();
trans = null;
}
if (checkoutEx == CheckoutException.Canceled)
{
return(null);
}
throw;
}
catch
{
if (trans != null)
{
trans.Cancel();
trans = null;
}
throw;
}
finally {
if (trans != null)
{
trans.Commit();
}
}
return(obj);
}
