ISelectionService Interface
Provides an interface for a designer to select components.
Assembly: System (in System.dll)
| Name | Description | |
|---|---|---|
![]() | PrimarySelection | Gets the object that is currently the primary selected object. |
![]() | SelectionCount | Gets the count of selected objects. |
| Name | Description | |
|---|---|---|
![]() | GetComponentSelected(Object^) | Gets a value indicating whether the specified component is currently selected. |
![]() | GetSelectedComponents() | Gets a collection of components that are currently selected. |
![]() | SetSelectedComponents(ICollection^) | Selects the specified collection of components. |
![]() | SetSelectedComponents(ICollection^, SelectionTypes) | Selects the components from within the specified collection of components that match the specified selection type. |
| Name | Description | |
|---|---|---|
![]() | SelectionChanged | Occurs when the current selection changes. |
![]() | SelectionChanging | Occurs when the current selection is about to change. |
When a component is selected, its viewable or editable properties are shown in the Properties window.
The following example demonstrates use of the ISelectionService to handle the SelectionChanged and SelectionChanging events.
#using <System.Windows.Forms.dll> #using <System.dll> #using <System.Drawing.dll> using namespace System; using namespace System::Drawing; using namespace System::Collections; using namespace System::ComponentModel; using namespace System::ComponentModel::Design; using namespace System::Windows::Forms; /* This sample demonstrates using the ISelectionService interface to receive notification of selection change events. The SelectionComponent control attempts to retrieve an instance of the ISelectionService when it is sited. If it can, it attaches event handlers for events provided by the service that display a message when a component is selected or deselected. To run this sample, add the SelectionComponent control to a Form and then select or deselect components in design mode to see the behavior of the component change event handlers. */ namespace ISelectionServiceExample { public ref class SelectionComponent: public System::Windows::Forms::UserControl { private: System::Windows::Forms::TextBox^ tbox1; ISelectionService^ selectionService; public: SelectionComponent() { // Initialize control this->SuspendLayout(); this->Name = "SelectionComponent"; this->Size = System::Drawing::Size( 608, 296 ); this->tbox1 = gcnew System::Windows::Forms::TextBox; this->tbox1->Location = System::Drawing::Point( 24, 16 ); this->tbox1->Name = "listBox1"; this->tbox1->Multiline = true; this->tbox1->Size = System::Drawing::Size( 560, 251 ); this->tbox1->TabIndex = 0; this->Controls->Add( this->tbox1 ); this->ResumeLayout(); } property ISite^ Site { virtual ISite^ get() override { return __super::Site; } virtual void set( ISite^ value ) override { // The ISelectionService is available in design mode // only, and only after the component is sited. if ( selectionService != nullptr ) { // Because the selection service has been // previously obtained, the component may be in // the process of being resited. // Detatch the previous selection change event // handlers in case the new selection // service is a new service instance belonging to // another design mode service host. selectionService->SelectionChanged -= gcnew EventHandler( this, &SelectionComponent::OnSelectionChanged ); selectionService->SelectionChanging -= gcnew EventHandler( this, &SelectionComponent::OnSelectionChanging ); } // Establish the new site for the component. __super::Site = value; if ( __super::Site == nullptr ) return; // The selection service is not available outside of // design mode. A call requesting the service // using GetService while not in design mode will // return null. selectionService = dynamic_cast<ISelectionService^>(this->Site->GetService( ISelectionService::typeid )); // If an instance of the ISelectionService was obtained, // attach event handlers for the selection // changing and selection changed events. if ( selectionService != nullptr ) { // Add an event handler for the SelectionChanging // and SelectionChanged events. selectionService->SelectionChanging += gcnew EventHandler( this, &SelectionComponent::OnSelectionChanging ); selectionService->SelectionChanged += gcnew EventHandler( this, &SelectionComponent::OnSelectionChanged ); } } } private: void OnSelectionChanged( Object^ /*sender*/, EventArgs^ /*args*/ ) { tbox1->AppendText( String::Format( "The selected component was changed. Selected components:\r\n {0}\r\n", GetSelectedComponents() ) ); } void OnSelectionChanging( Object^ /*sender*/, EventArgs^ /*args*/ ) { tbox1->AppendText( String::Format( "The selected component is changing. Selected components:\r\n {0}\r\n", GetSelectedComponents() ) ); } String^ GetSelectedComponents() { String^ selectedString = String::Empty; array<Object^>^components = gcnew array<Object^>((dynamic_cast<ICollection^>(selectionService->GetSelectedComponents()))->Count); (dynamic_cast<ICollection^>(selectionService->GetSelectedComponents()))->CopyTo( components, 0 ); for ( int i = 0; i < components->Length; i++ ) { if ( i != 0 ) selectedString = selectedString + "&& "; if ( (dynamic_cast<IComponent^>(selectionService->PrimarySelection)) == (dynamic_cast<IComponent^>(components[ i ])) ) selectedString = selectedString + "PrimarySelection:"; selectedString = selectedString + (dynamic_cast<IComponent^>(components[ i ]))->Site->Name + " "; } return selectedString; } // Clean up any resources being used. public: ~SelectionComponent() { // Detach the event handlers for the selection service. if ( selectionService != nullptr ) { selectionService->SelectionChanging -= gcnew EventHandler( this, &SelectionComponent::OnSelectionChanging ); selectionService->SelectionChanged -= gcnew EventHandler( this, &SelectionComponent::OnSelectionChanged ); } } }; }
Available since 1.1


