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Provider Properties + IExtenderProviderIs there any way to create an extender that provides an event to all controls
that I return CanExtends==true for? It seems I can provide properties, like strings, bools, ints, but not events to other controls. The reason I would like to do this is so I can associate an event with the control and have the designer automatically add the event handler for me when the user double clicks the event in the event pane of the designer for the control. Is there a way to do this? Thanks, Dave You can return true to all cases from CanExtend. You might do this if you
wanted to provide a property for anything based on Component for example. The IExtenderProvider only enables you to add a property at design time. You can't add an event. It's important to note that the property isn't really added to the object. This is just a design time trick that enables the IDE to make the user think that the object has properties it doesn't. At runtime those properties do not exist and must be handled by the property provider itself. More particularly, the object being extended has no knowledge that the addition has taken place and so for it to magically gain an event in this manner would make no sense. Maybe you should explain in detail what you want to do rather than speculate on the operation of the extender provider. There may be another way to answer the question. -- Show quoteBob Powell [MVP] Visual C#, System.Drawing Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. "WXS" <W**@discussions.microsoft.com> wrote in message news:B4425918-BDFB-45AA-A548-4B8E15ABB775@microsoft.com... > Is there any way to create an extender that provides an event to all controls > that > I return CanExtends==true for? It seems I can provide properties, like > strings, bools, ints, but not events to other controls. > > The reason I would like to do this is so I can associate an event with the > control and have the designer automatically add the event handler for me when > the user double clicks the event in the event pane of the designer for the > control. > > Is there a way to do this? > Thanks, > Dave What I would like to do is for controls like menu items, or buttons add (or
others) add an event to them that can be seen and added in the designer by double clicking on it. I am going to have the provider property link up this event based on another provider property added to the control. Is the only way to do this to derive a class from each control I want the event on and add the event to that derived class (for example menu items?) The problem is I want all menu items to have it even if they are part of a Main menu or context menu. The purpose is to associate the newly created event handler. This allows the developer to easily create event handlers through the designer and allows me to internally link up the handler. I understand it is just a designer effect that is the purpose I am going for to make it easy for developers to associate a special event handler with any control I choose. If it can't be done this way, any other possibilities, VS-Addin's, if so any hints on how to pull that off? Thanks, Dave Show quote "Bob Powell [MVP]" wrote: > You can return true to all cases from CanExtend. You might do this if you > wanted to provide a property for anything based on Component for example. > > The IExtenderProvider only enables you to add a property at design time. You > can't add an event. > > It's important to note that the property isn't really added to the object. > This is just a design time trick that enables the IDE to make the user think > that the object has properties it doesn't. At runtime those properties do > not exist and must be handled by the property provider itself. More > particularly, the object being extended has no knowledge that the addition > has taken place and so for it to magically gain an event in this manner > would make no sense. > > Maybe you should explain in detail what you want to do rather than speculate > on the operation of the extender provider. There may be another way to > answer the question. > > > -- > Bob Powell [MVP] > Visual C#, System.Drawing > > Find great Windows Forms articles in Windows Forms Tips and Tricks > http://www.bobpowell.net/tipstricks.htm > > Answer those GDI+ questions with the GDI+ FAQ > http://www.bobpowell.net/faqmain.htm > > All new articles provide code in C# and VB.NET. > Subscribe to the RSS feeds provided and never miss a new article. > > > > > > "WXS" <W**@discussions.microsoft.com> wrote in message > news:B4425918-BDFB-45AA-A548-4B8E15ABB775@microsoft.com... > > Is there any way to create an extender that provides an event to all > controls > > that > > I return CanExtends==true for? It seems I can provide properties, like > > strings, bools, ints, but not events to other controls. > > > > The reason I would like to do this is so I can associate an event with the > > control and have the designer automatically add the event handler for me > when > > the user double clicks the event in the event pane of the designer for the > > control. > > > > Is there a way to do this? > > Thanks, > > Dave > > > A second question I ran into is, how to determine if I am in design mode in
my component when it first gets initialized. DesignMode does not appear to be set propertly when I check it in the constructor of my component but it is set by the time either property or CanExtend gets called. My workaround currently checks the first time CanExtend is called it adds my event handler. This seems like a hack. I tried an alternate method when I derive my component from ISupportInitialize and try to do work in the BeginInit method so I can hook up designer events for my component at design time to see if my component was removed or not. This method is not called until the form itself is recompiled so I never got the chance to add the event method to know if my component got removed, which means I leave some items on the form when my component gets removed. (The example scenario is someone adds the component on the form.. does a bunch of things on it to cause a bunch of internal components to be generated, then remove the component from the form... I can't rely on BeginInit as it does not seem to be called the first time the component is dropped on the form, until it is recompiled.) Is there a better way to do this? I'm about to try getting a reference to the DesignerHost and just check to see if it's null. Ideas? Show quote "Bob Powell [MVP]" wrote: > You can return true to all cases from CanExtend. You might do this if you > wanted to provide a property for anything based on Component for example. > > The IExtenderProvider only enables you to add a property at design time. You > can't add an event. > > It's important to note that the property isn't really added to the object. > This is just a design time trick that enables the IDE to make the user think > that the object has properties it doesn't. At runtime those properties do > not exist and must be handled by the property provider itself. More > particularly, the object being extended has no knowledge that the addition > has taken place and so for it to magically gain an event in this manner > would make no sense. > > Maybe you should explain in detail what you want to do rather than speculate > on the operation of the extender provider. There may be another way to > answer the question. > > > -- > Bob Powell [MVP] > Visual C#, System.Drawing > > Find great Windows Forms articles in Windows Forms Tips and Tricks > http://www.bobpowell.net/tipstricks.htm > > Answer those GDI+ questions with the GDI+ FAQ > http://www.bobpowell.net/faqmain.htm > > All new articles provide code in C# and VB.NET. > Subscribe to the RSS feeds provided and never miss a new article. > > > > > > "WXS" <W**@discussions.microsoft.com> wrote in message > news:B4425918-BDFB-45AA-A548-4B8E15ABB775@microsoft.com... > > Is there any way to create an extender that provides an event to all > controls > > that > > I return CanExtends==true for? It seems I can provide properties, like > > strings, bools, ints, but not events to other controls. > > > > The reason I would like to do this is so I can associate an event with the > > control and have the designer automatically add the event handler for me > when > > the user double clicks the event in the event pane of the designer for the > > control. > > > > Is there a way to do this? > > Thanks, > > Dave > > >  |
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