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The ICustomDestinationList::BeginList method provides you with an opportunity to discover that the user removed items from the Jump List. The ppv parameter of this method will contain a collection (typically IObjectArray) of removed items IShellItem and IShellLink objects. It s also possible to call the ICustomDestinationList::GetRemovedDestinations method directly to retrieve the list of removed items without initiating a list-building transaction. The managed equivalent for determining that items were removed from the Jump List is the JumpList.RemovedDestinations property of the Windows API Code Pack, which proactively discovers removed items. Fortunately, the Windows API Code Pack automatically deletes removed items from the custom categories provided by the application to ensure that items removed by the user are not re-added to the application s Jump List.
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Working with custom destinations requires the ICustomDestinationList interface, which is obtained by co-creating the CLSID_DestinationList COM object. If your application uses an explicit application ID, you must use the ICustomDestinationList::SetAppID method before using the resulting object. As always, the managed Windows API Code Pack streamlines this work for you custom categories can be added using the JumpList.AddCustomCategories method, and the application ID is automatically propagated from the TaskbarManager.Instance.ApplicationID property. A list-building transaction begins with a call to the ICustomDestinationList::BeginList method. Subsequent method calls will not be applied to the actual Jump List until the CommitList method is called to commit the changes, or until the AbortList method is called to roll back the work. The managed wrapper does not require multiple steps it refreshes the Jump List when changes are made to the underlying model and the JumpList.Refresh method is called. To construct the Jump List categories, a two-step approach is required. First, you construct a collection (usually IObjectCollection) of custom destinations (IShellItem or IShellLink objects) that belong to a category or, in managed code, create a JumpListCustomCategory object and add JumpListItem and JumpListLink objects to it. Next, you call the ICustomDestinationList::AppendCategory method to append the entire category to the list or, in managed code, pass the JumpListCustomCategory object to the JumpList.AddCustomCategories method. The following code snippet, which displays both the native and managed code, shows how to construct a Jump List with one custom category:
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//C++: ICustomDestinationList* pJumpList = NULL; if (FAILED(CoCreateInstance(
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CLSID_DestinationList, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pJumpList)))) goto Cleanup; if (FAILED(pJumpList->SetAppID(L"Microsoft.Samples.MyApplication"))) goto Cleanup; UINT uMaxSlots; IObjectArray* pRemoved; if (FAILED(pJumpList->BeginList(&uMaxSlots, IID_PPV_ARGS(&pRemoved)))) goto Cleanup; IObjectCollection* pContents = NULL; if (FAILED(CoCreateInstance( CLSID_EnumerableObjectCollection, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pContents)))) goto Cleanup; IShellItem* pItem = NULL; if (FAILED(SHCreateItemInKnownFolder( FOLDERID_Documents, KF_FLAG_DEFAULT, L"MyFile.txt", IID_PPV_ARGS(&pItem)))) goto Cleanup; if (FAILED(pContents->AddObject(pItem))) goto Cleanup; IObjectArray* pContentsArr = NULL; if (FAILED(pContents->QueryInterface(IID_PPV_ARGS(&pContentsArr)))) goto Cleanup; if (FAILED(pJumpList->AppendCategory(L"My Category", pContentsArr))) goto Cleanup; pJumpList->CommitList(); Cleanup: if (pContentsArr != NULL) pContentsArr->Release(); if (pItem != NULL) pItem->Release(); if (pContents != NULL) pContents->Release(); if (pJumpList != NULL) pJumpList->Release(); //C#: JumpList jumpList = JumpList.CreateJumpList(); JumpListCustomCategory category = new JumpListCustomCategory("My Category"); category.AddJumpListItems(new JumpListItem(Path.Combine( Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "MyFile.ext"))); jumpList.AddCustomCategories (category); jumpList.Refresh();
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If at any time you want to clear the Jump List, you can use the DeleteList method of the ICustomDestinationList interface. In managed code, you can create an empty JumpList instance and then call its Refresh method. You should not clear the application Jump List when your application starts or worse, during normal application execution. Users rely on the contents of the Jump List to remain stable and like to retain the same categorized destinations and tasks across multiple uses of an application. The reasonable use case for clearing the application s Jump List is when your application is uninstalled, or when the user explicitly asks to do so for example, using a Clear History command in a Web browser.
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User tasks despite their name are additional tasks that can be placed in your application s Jump List. These are verbs that can invoke your application or any other application, and they re usually represented by IShellLink objects. After you ve mastered the intricate details of adding categorized destinations to the Jump List, user tasks are much easier to grasp.
Note Because user tasks are not connected to an existing application instance, it makes sense to set them up during application installation. To do this, you can either ensure that your installer has the same AppID as the application itself, or you can launch an auxiliary application from within the installer that claims the same AppID and creates the user tasks. (This auxiliary application could also be your main application with a quiet-mode switch that creates the tasks and exits without displaying UI.)
You need the ICustomDestinationList interface if you re working from native code. After beginning a list-building transaction (with BeginList), you can use the AddUserTasks method to add a collection of tasks usually represented by an IObjectCollection containing IShellLink objects. As you might remember, the task list can contain separators that group related tasks. To add a separator, create an IShellLink object and use the IPropertyStore interface to set its System.AppUserModel.IsDestListSeparator property to TRUE. This object can then be added to the Jump List along with the rest of the tasks. The managed equivalent for adding user tasks is the JumpList.AddUserTasks method, which accepts JumpListLink, JumpListItem, and JumpListSeparator objects and adds them to the
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