{"id":13613,"date":"2022-10-04T17:30:01","date_gmt":"2022-10-04T12:00:01","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/"},"modified":"2022-10-04T17:30:01","modified_gmt":"2022-10-04T12:00:01","slug":"solved-how-to-override-a-signal-in-qt","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/","title":{"rendered":"[Solved] How to override a signal in qt?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-51040903\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"51040903\" data-parentid=\"51040664\" data-score=\"6\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>You cannot replace a signal with another signal in a subclass. You can, however, emit an additional signal with the original signal in a self-connected slot:<\/p>\n<pre><code>class MyDimasCheckBox : public QCheckBox\n{\n    Q_OBJECT\npublic:\n    MyDimasCheckBox(QWidget *parent =0);\n    ~MyDimasCheckBox();\n\n    QString stroka;\nprivate slots:\n    \/\/ Emits the new signal\n    void doEmitStateChanged(int i);\n\nsignals:\n    void stateChanged(int, QString);\n};\n\nMyDimasCheckBox::MyDimasCheckBox(QWidget *parent) : QCheckBox(parent) {\n    \/\/ Connect original signal to slot \n    connect(this, SIGNAL(stateChanged(int)), this, SLOT(doEmitStateChanged(int)));\n}\n\nvoid MyDimasCheckBox::doEmitStateChanged(int i) { \n    emit stateChanged(i, stroka); \n}\n<\/code><\/pre>\n<p>With the new connection syntax, you can omit the slot and use a lambda:<\/p>\n<pre><code>connect(this, qOverload&lt;int&gt;(&amp;QCheckBox::stateChanged), \n        \/\/ \"this\" context-object for QThread-Affinity\n        this, [=](int i) { emit this-&gt;stateChanged(i, this-&gt;stroka); });\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">10<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to override a signal in qt? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You cannot replace a signal with another signal in a subclass. You can, however, emit an additional signal with the original signal in a self-connected slot: class MyDimasCheckBox : public QCheckBox { Q_OBJECT public: MyDimasCheckBox(QWidget *parent =0); ~MyDimasCheckBox(); QString stroka; private slots: \/\/ Emits the new signal void doEmitStateChanged(int i); signals: void stateChanged(int, QString); &#8230; <a title=\"[Solved] How to override a signal in qt?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/\" aria-label=\"More on [Solved] How to override a signal in qt?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,1088,3629],"class_list":["post-13613","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-qt","tag-qt5"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] How to override a signal in qt? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to override a signal in qt? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You cannot replace a signal with another signal in a subclass. You can, however, emit an additional signal with the original signal in a self-connected slot: class MyDimasCheckBox : public QCheckBox { Q_OBJECT public: MyDimasCheckBox(QWidget *parent =0); ~MyDimasCheckBox(); QString stroka; private slots: \/\/ Emits the new signal void doEmitStateChanged(int i); signals: void stateChanged(int, QString); ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-10-04T12:00:01+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-how-to-override-a-signal-in-qt\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-how-to-override-a-signal-in-qt\\\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#\\\/schema\\\/person\\\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] How to override a signal in qt?\",\"datePublished\":\"2022-10-04T12:00:01+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-how-to-override-a-signal-in-qt\\\/\"},\"wordCount\":58,\"publisher\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#organization\"},\"keywords\":[\"c++\",\"qt\",\"qt5\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-how-to-override-a-signal-in-qt\\\/\",\"url\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-how-to-override-a-signal-in-qt\\\/\",\"name\":\"[Solved] How to override a signal in qt? - JassWeb\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#website\"},\"datePublished\":\"2022-10-04T12:00:01+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-how-to-override-a-signal-in-qt\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-how-to-override-a-signal-in-qt\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/solved-how-to-override-a-signal-in-qt\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"[Solved] How to override a signal in qt?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#website\",\"url\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/\",\"name\":\"JassWeb\",\"description\":\"Build High-quality Websites\",\"publisher\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#organization\",\"name\":\"Jass Web\",\"url\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/jassweb.com\\\/wp-content\\\/uploads\\\/2021\\\/02\\\/jass-website-logo-1.png\",\"contentUrl\":\"https:\\\/\\\/jassweb.com\\\/wp-content\\\/uploads\\\/2021\\\/02\\\/jass-website-logo-1.png\",\"width\":693,\"height\":132,\"caption\":\"Jass Web\"},\"image\":{\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/#\\\/schema\\\/person\\\/65c9c7b7958150c0dc8371fa35dd7c31\",\"name\":\"Kirat\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/wp-content\\\/litespeed\\\/avatar\\\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1777613206\",\"url\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/wp-content\\\/litespeed\\\/avatar\\\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1777613206\",\"contentUrl\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/wp-content\\\/litespeed\\\/avatar\\\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1777613206\",\"caption\":\"Kirat\"},\"sameAs\":[\"http:\\\/\\\/jassweb.com\"],\"url\":\"https:\\\/\\\/jassweb.com\\\/solved\\\/author\\\/jaspritsinghghumangmail-com\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"[Solved] How to override a signal in qt? - JassWeb","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/","og_locale":"en_US","og_type":"article","og_title":"[Solved] How to override a signal in qt? - JassWeb","og_description":"[ad_1] You cannot replace a signal with another signal in a subclass. You can, however, emit an additional signal with the original signal in a self-connected slot: class MyDimasCheckBox : public QCheckBox { Q_OBJECT public: MyDimasCheckBox(QWidget *parent =0); ~MyDimasCheckBox(); QString stroka; private slots: \/\/ Emits the new signal void doEmitStateChanged(int i); signals: void stateChanged(int, QString); ... Read more","og_url":"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/","og_site_name":"JassWeb","article_published_time":"2022-10-04T12:00:01+00:00","author":"Kirat","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Kirat","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/#article","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/"},"author":{"name":"Kirat","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31"},"headline":"[Solved] How to override a signal in qt?","datePublished":"2022-10-04T12:00:01+00:00","mainEntityOfPage":{"@id":"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/"},"wordCount":58,"publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"keywords":["c++","qt","qt5"],"articleSection":["Solved"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/","url":"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/","name":"[Solved] How to override a signal in qt? - JassWeb","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/#website"},"datePublished":"2022-10-04T12:00:01+00:00","breadcrumb":{"@id":"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/jassweb.com\/solved\/solved-how-to-override-a-signal-in-qt\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/jassweb.com\/solved\/"},{"@type":"ListItem","position":2,"name":"[Solved] How to override a signal in qt?"}]},{"@type":"WebSite","@id":"https:\/\/jassweb.com\/solved\/#website","url":"https:\/\/jassweb.com\/solved\/","name":"JassWeb","description":"Build High-quality Websites","publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/jassweb.com\/solved\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/jassweb.com\/solved\/#organization","name":"Jass Web","url":"https:\/\/jassweb.com\/solved\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/","url":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","contentUrl":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","width":693,"height":132,"caption":"Jass Web"},"image":{"@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31","name":"Kirat","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1777613206","url":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1777613206","contentUrl":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1777613206","caption":"Kirat"},"sameAs":["http:\/\/jassweb.com"],"url":"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/"}]}},"_links":{"self":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/13613","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/comments?post=13613"}],"version-history":[{"count":0,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/13613\/revisions"}],"wp:attachment":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/media?parent=13613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/categories?post=13613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/tags?post=13613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}