Relaying a message through several layers of child instances in Qt
I am writing a Qt application that has one main window containing a box intended for messages to the user. The main window also has a load of child, grand child, great-grand child a.s.o. widgets. I would like these offspring to be able to print into the main window's message box. I could set up such a path by implementing a print_message method that accesses the parent's print_message in each module up the family tree, so that a message gets relayed to the main window through all generations/instances. Is there a better way of doing this?
qt
asked Nov 22 '18 at 7:09
zeus300zeus300
3761317
add a comment |
I am writing a Qt application that has one main window containing a box intended for messages to the user. The main window also has a load of child, grand child, great-grand child a.s.o. widgets. I would like these offspring to be able to print into the main window's message box. I could set up such a path by implementing a print_message method that accesses the parent's print_message in each module up the family tree, so that a message gets relayed to the main window through all generations/instances. Is there a better way of doing this?
qt
asked Nov 22 '18 at 7:09
zeus300zeus300
3761317
You could use signal/slot, any child would connect its own signal to a global slot that displays the given message (in a dedicated class like a singleton, or just with pointer of your main window you pass to all children).
– ymoreau
Nov 22 '18 at 9:02
add a comment |
I am writing a Qt application that has one main window containing a box intended for messages to the user. The main window also has a load of child, grand child, great-grand child a.s.o. widgets. I would like these offspring to be able to print into the main window's message box. I could set up such a path by implementing a print_message method that accesses the parent's print_message in each module up the family tree, so that a message gets relayed to the main window through all generations/instances. Is there a better way of doing this?
qt
asked Nov 22 '18 at 7:09
zeus300zeus300
3761317
I am writing a Qt application that has one main window containing a box intended for messages to the user. The main window also has a load of child, grand child, great-grand child a.s.o. widgets. I would like these offspring to be able to print into the main window's message box. I could set up such a path by implementing a print_message method that accesses the parent's print_message in each module up the family tree, so that a message gets relayed to the main window through all generations/instances. Is there a better way of doing this?
qt
qt
asked Nov 22 '18 at 7:09
zeus300zeus300
3761317
asked Nov 22 '18 at 7:09
zeus300zeus300
3761317
asked Nov 22 '18 at 7:09
zeus300zeus300
3761317
asked Nov 22 '18 at 7:09
zeus300zeus300
3761317
asked Nov 22 '18 at 7:09
zeus300zeus300
3761317
3761317
You could use signal/slot, any child would connect its own signal to a global slot that displays the given message (in a dedicated class like a singleton, or just with pointer of your main window you pass to all children).
– ymoreau
Nov 22 '18 at 9:02
add a comment |
You could use signal/slot, any child would connect its own signal to a global slot that displays the given message (in a dedicated class like a singleton, or just with pointer of your main window you pass to all children).
– ymoreau
Nov 22 '18 at 9:02
You could use signal/slot, any child would connect its own signal to a global slot that displays the given message (in a dedicated class like a singleton, or just with pointer of your main window you pass to all children).
– ymoreau
Nov 22 '18 at 9:02
You could use signal/slot, any child would connect its own signal to a global slot that displays the given message (in a dedicated class like a singleton, or just with pointer of your main window you pass to all children).
– ymoreau
Nov 22 '18 at 9:02
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53425572%2frelaying-a-message-through-several-layers-of-child-instances-in-qt%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53425572%2frelaying-a-message-through-several-layers-of-child-instances-in-qt%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
You could use signal/slot, any child would connect its own signal to a global slot that displays the given message (in a dedicated class like a singleton, or just with pointer of your main window you pass to all children).
– ymoreau
Nov 22 '18 at 9:02