{"id":2983,"date":"2013-10-09T07:00:00","date_gmt":"2013-10-09T07:00:00","guid":{"rendered":"https:\/\/blogs.msdn.microsoft.com\/oldnewthing\/2013\/10\/09\/using-the-tab-key-to-navigate-in-non-dialogs-redux\/"},"modified":"2013-10-09T07:00:00","modified_gmt":"2013-10-09T07:00:00","slug":"using-the-tab-key-to-navigate-in-non-dialogs-redux","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/oldnewthing\/20131009-00\/?p=2983","title":{"rendered":"Using the TAB key to navigate in non-dialogs, redux"},"content":{"rendered":"

\nYou want to use the TAB key to navigate through a non-dialog,\nso you\n\ncall Is­Dialog­Message<\/code> in your message loop<\/a>,\nbut it doesn’t work!\n<\/p>\n

\n\/\/ code in italics is wrong\nMSG msg;\nwhile (GetMessage(&msg, NULL, 0, 0)) {\n  if (!msg.hwnd || !IsDialogMessage(msg.hwnd, &msg)) {\n    TranslateMessage(&msg);\n    DispatchMessage(&msg);\n  }\n}<\/i>\n<\/pre>\n
\nThe problem here is that you are passing the wrong\nwindow handle to\nIs­Dialog­Message<\/code>.\nThe first parameter to\nIs­Dialog­Message<\/code>\nis the dialog-like window you want to be able to navigate through.\nBut the code above passes the window that received the message,\nso you are basically telling the control to do TAB navigation\nwithin itself<\/i>.\nAnd naturally, the result of that is that focus stays where it is<\/i>,\nbecause if you ask a button,\n“Hey, could you move to your next tab stop?”\nthe button is going to say,\n“Dude, I’m the only tab stop on my window!”\n<\/p>\n
\nIf you think about it,\npassing the window the message was already going to be dispatched\nto isn’t very interesting.\nIf that was the design of the function,\nthen all the work of\nIs­Dialog­Message<\/code>\ncould’ve just been put in\nDef­Window­Proc<\/code>\nand we wouldn’t have needed a\nIs­Dialog­Message<\/code>\nfunction in the first place.\n<\/p>\n
\nAnd if you think about it,\npassing the window the message was already going to be dispatched\nto isn’t very interesting.\nIf that was the design of the function,\nthen the parameter isn’t necessary.\nThe function could just infer it directly from the\nMSG<\/code> structure you passed as the second parameter.\n<\/p>\n
\nThe fix is to pass the main window handle to\nIs­Dialog­Message<\/code>:\n<\/p>\n
\nMSG msg;\nwhile (GetMessage(&msg, NULL, 0, 0)) {\n  if (!msg.hwnd || !IsDialogMessage(hwndFrame<\/font>, &msg)) {\n    TranslateMessage(&msg);\n    DispatchMessage(&msg);\n  }\n}\n<\/pre>\n
\nReminder<\/b>:\nAs noted in the original article,\n\nyou should not use the WM_USER<\/code> or\nWM_USER + 1<\/code> messages\nin your custom window<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
You want to use the TAB key to navigate through a non-dialog, so you call Is­Dialog­Message in your message loop, but it doesn’t work! \/\/ code in italics is wrong MSG msg; while (GetMessage(&msg, NULL, 0, 0)) { if (!msg.hwnd || !IsDialogMessage(msg.hwnd, &msg)) { TranslateMessage(&msg); DispatchMessage(&msg); } } The problem here is that you are […]<\/p>\n","protected":false},"author":1069,"featured_media":111744,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[25],"class_list":["post-2983","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oldnewthing","tag-code"],"acf":[],"blog_post_summary":"
You want to use the TAB key to navigate through a non-dialog, so you call Is­Dialog­Message in your message loop, but it doesn’t work! \/\/ code in italics is wrong MSG msg; while (GetMessage(&msg, NULL, 0, 0)) { if (!msg.hwnd || !IsDialogMessage(msg.hwnd, &msg)) { TranslateMessage(&msg); DispatchMessage(&msg); } } The problem here is that you are […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/2983","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/users\/1069"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/comments?post=2983"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/2983\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media\/111744"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media?parent=2983"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/categories?post=2983"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/tags?post=2983"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}