One would expect that the WPF ListBox control would have some kind of FocusedIndex property to find out which item has the keyboard focus (and that dashed border around it) — but it’s not there. It seems the workaround requires a few lines of code, which I present here.<\/p>\n
In a ListBox’s default mode that allows exactly one item to be selected, you can quite easily query the SelectedIndex property instead, since the focused item is always also the one selected item. <\/p>\n
But when you allow multiple selections, finding the focused item is not as simple. It may not even be selected. <\/p>\n
There is<\/em> a ListBoxItem.IsFocused boolean property. If you’re not<\/em> using data-binding (you probably should be) you can just iterate through ListBox.Items and break out when you find where ListBoxItem.IsFocused == true.<\/p>\n If you are<\/em> using data-binding, then the ListBox.Items collection is your data-bound objects rather than ListBoxItems. You have to get to your ListBoxItem instances another way:<\/p>\n <\/p>\n Even with these tricks, if the focus isn’t on the ListBox at all, there’s no programmatic way (that I can find anyway) to find out which ListBoxItem would have focus once the ListBox received focus again.<\/p>\n","protected":false},"excerpt":{"rendered":" One would expect that the WPF ListBox control would have some kind of FocusedIndex property to find out which item has the keyboard focus (and that dashed border around it) — but it’s not there. It seems the workaround requires a few lines of code, which I present here. ListBox.SelectionMode = Single In a ListBox’s default […]<\/p>\n","protected":false},"author":2685,"featured_media":37840,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[4617,396],"class_list":["post-443","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-permierdev","tag-andarno","tag-wpf"],"acf":[],"blog_post_summary":" One would expect that the WPF ListBox control would have some kind of FocusedIndex property to find out which item has the keyboard focus (and that dashed border around it) — but it’s not there. It seems the workaround requires a few lines of code, which I present here. ListBox.SelectionMode = Single In a ListBox’s default […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/posts\/443","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/users\/2685"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/comments?post=443"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/posts\/443\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/media\/37840"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/media?parent=443"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/categories?post=443"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/tags?post=443"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}for<\/span> (int<\/span> i = 0; i < listBox1.Items.Count; i++) {\r\n object<\/span> yourObject = listBox1.Items[i];\r\n ListBoxItem lbi = (ListBoxItem)listBox1.ItemContainerGenerator.ContainerFromItem(yourObject);\r\n if<\/span> (lbi.IsFocused) {\r\n MessageBox.Show(\"Item at index \"<\/span> + i.ToString() + \" has the focus.\"<\/span>);\r\n break<\/span>;\r\n }\r\n}\r\n<\/pre>\nSo where are we at?<\/h4>\n