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.NET Forum / Windows Forms / Design Time / October 2004Updating verbs in the PropertyGrid
I'm working on a component (with a custom designer) where the designer verbs change based on what a property is set to. The problem is,... it appears that the designer keeps its own cache of the verbs such that when I change the property of my component, I have to click off the component and then back onto it to update the verb links listed in the PropertyGrid. I can't explain it any simpler than that. If you've tried to dynamically change the verbs before, changing the context menu verbs is easy, but changing the links in the property grid without reselecting the component is proving to be very difficult. Anybody have the answer? Thanks, Jacob P.S. - Some sample code... internal class MyCustomDesigner : ControlDesigner { public override DesignerVerbCollection Verbs { get { DesignerVerbCollection verbs = new DesignerVerbCollection(); // Adding of custom verbs here.... return verbs; } } public override void Initialize(IComponent component) { base.Initialize(component); // Be notified when properties are changed. IComponentChangeService service = GetService( typeof(IComponentChangeService)) as IComponentChangeService; if(service != null) service.ComponentChanged += new ComponentChangedEventHandler(OnComponentChanged); } #region Private Methods private void OnComponentChanged(object sender, ComponentChangedEventArgs e) { if(e.Component == this.Component && e.Member != null && e.Member.Name == "Icon") { // This is where I want to change the verbs displayed. } } } you just have to have a reference of the designerverbs on the designer class level to modify their properties on your OnComponentChanged eventhandler public class CdxTabControlAdvancedDesigner : System.Windows.Forms.Design.ParentControlDesigner { private DesignerVerb m_verbRemoveTab = null; private DesignerVerb m_verbAddTab = null; private void OnComponentChanged(object sender, ComponentChangedEventArgs e) { //Modify the designerverbs here if (e.Component = this.Component) this.ModifyMenu(); } protected virtual void ModifyMenu() { m_verbRemoveTab.Enabled = false; if (this.CdxTabControlAdvanced.aaTabButtons.Count > 0) { m_verbRemoveTab.Enabled = true; } } public CdxTabControlAdvancedDesigner() { this.m_verbAddTab = new DesignerVerb("Add Tab", new EventHandler(this.e_OnAddTab)); this.m_verbRemoveTab = new DesignerVerb("Remove Tab", new EventHandler(this.e_OnRemoveTab)); base.Verbs.AddRange(new DesignerVerb[] {this.m_verbAddTab, this.m_verbRemoveTab}); } protected override void Dispose(bool bIsDisposing) { IComponentChangeService cs = GetService(typeof(IComponentChangeService)) as IComponentChangeService; if (cs != null) { cs.ComponentChanged -=new ComponentChangedEventHandler(OnComponentChanged); } base.Dispose(bIsDisposing); } public override void Initialize(IComponent Icomponent) { base.Initialize(Icomponent); IComponentChangeService cs = GetService(typeof(IComponentChangeService)) as IComponentChangeService; if (cs != null) { cs.ComponentChanged +=new ComponentChangedEventHandler(OnComponentChanged); } ModifyMenu(); } } > I'm working on a component (with a custom designer) where the designer verbs > change based on what a property is set to. The problem is,... it appears [quoted text clipped - 71 lines] > > } I forgot to include the key thing: utilize the ISelectionService and provide an eventhandler for its SelectionChanged. When your control is selected, refresh the designerverbs: private void OnSelectionServiceSelectionChanged(object sender, EventArgs e) { ISelectionService ss = GetService(typeof(ISelectionService)) as ISelectionService; if (ss.SelectionCount == 1 && ss.PrimarySelection is CdxTabControlAdvanced) { this.ModifyMenu(); } } Added wireups on the Initialize method of the designer: IDesignerHost host = GetService(typeof(IDesignerHost)) as IDesignerHost; ISelectionService ss = GetService(typeof(ISelectionService)) as ISelectionService; if (ss != null) { ss.SelectionChanged +=new EventHandler(e_OnISelectionServiceSelectionChanged); } sorry for the mess... > you just have to have a reference of the designerverbs on the designer class > level to modify their properties on your OnComponentChanged eventhandler [quoted text clipped - 169 lines] > > > > } Hello Jacob, just my 2 cent. A solution is described in http://www.awprofessional.com/articles/article.asp?p=169528&seqNum=6 Section "Design-Time Context Menu Verbs". A nice text. Close to what Joey writes (as i see it), but commented. HTH, Dima > I forgot to include the key thing: utilize the ISelectionService and provide > an eventhandler for its SelectionChanged. When your control is selected, [quoted text clipped - 216 lines] > > > > > > } actually, it is one of my best reference for designers... can't wait to buy the book, :p > Hello Jacob, > [quoted text clipped - 228 lines] > > > > > > > > } Chris Sell's book and online chapter is no doubt a great resource. However, I've scoured it thoroughly for a solution to my problem without an answer. As a side note, he does present a solution to updating the verbs in the context menu while still having the control selected using the IMenuCommandService, but no solution for doing the same to the property grid. Thanks, Jacob > Hello Jacob, > [quoted text clipped - 243 lines] >> > > >> > > } Thank you for your great answer, but it's a solution to a little bit different problem. I've had no problems, enabling/disabling and setting the verbs to visible/invisible. The problem is ADDING verbs and REMOVING verbs from the collection. The changes made to the collection don't seem to get updated until after the control is deselected and reselected again. I poked around some things with Reflector and found that the PropertyGrid keeps its own array of verbs, different from the collection that is edited in the ControlDesigner. That seems to be the problem. The PropertyGrid's array doesn't get updated when a property is changed on the control and the control is still selected until after you deselect it and reselect it again. Do you have an answer for this one? Jacob P.S. - I've tried using the ISelectionService to deselect all controls and reselect my control after the control's property is changed but it still won't update the PropertyGrids verbs unless you deselect and reselect yourself. >I forgot to include the key thing: utilize the ISelectionService and >provide [quoted text clipped - 223 lines] >> > >> > } Hi Jacob, I had the same problem, maybe someone else can shed some light on this.... in the meantime, I have been able to get ISelectionService to work. Is this how your doing it? DesignerVerb verbTestOn; DesignerVerb verbTestOff; public override initialize(IComponent component) { verbTestOn = new DesignerVerb("Test On",new EventHandler(TestOn)); verbTestOff = new DesignerVerb("Test Off",new EventHandler(TestOff)); Verbs.Add(verbTestOn); } private void TestOn(object sender, EventArgs e) { Verbs.Remove(verbTestOn); Verbs.Add(verbTestOff); ISelectionService ss = (ISelectionService)GetService(typeof(ISelectionService)); ss.SetSelectedComponents(new IComponent[] { this.Control.Parent } ); ss.SetSelectedComponents(new IComponent[] { this.Control } ); } private void TestOff(object sender, EventArgs e) { Verbs.Add(verbTestOn); Verbs.Remove(verbTestOff); ISelectionService ss = (ISelectionService)GetService(typeof(ISelectionService)); ss.SetSelectedComponents(new IComponent[] { this.Control.Parent } ); ss.SetSelectedComponents(new IComponent[] { this.Control } ); } kind regards Jerron > Thank you for your great answer, but it's a solution to a little bit > different problem. I've had no problems, enabling/disabling and setting the [quoted text clipped - 242 lines] > >> > > >> > } Thanks for the suggestion but I've tried the ISelectionService approach that you suggested. It works in your instance where it's a verb that is being invoked, but not in my instance where a property is changing in the property grid. Amazingly doing the exact same thing that you've suggested here won't work if you put it in a IComponentChanged event handler. Jacob > Hi Jacob, > [quoted text clipped - 309 lines] >> >> > >> >> > }
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