windows - Crash when calling getOpenFileName from QItemDelegate's custom editor -

-

prerequisites:

i have custom qitemdelegate creates custom editor treeview items. editor consists of qlineedit , qtoolbutton. button used open file dialog selecting file , placing it's path line edit. use call qfiledialog::getopenfilename open file dialog. dialog native windows file dialog (this important).

when editor created first time, works ok no matter how press button. after editor closed , reopened again first press on button results in crash. reason of crash custom editor gets deleted.

here code:

void ccustomeditor::on_runsetupbtn_clicked() {     auto qfilename = qfiledialog::getopenfilename(this,         "select application run",         qstring(),         "executable files (*.exe)");      if (qfilename.isempty())         return;      setcommandline(qdir::tonativeseparators(qfilename), m_qparameters); }

i have made digging , found out calling winapi function getopenfilename results in same way: editor gets deleted (although crash doesn't happen). seems qt calls internally.

i have tracked down reason of why editor gets deleted , found out when getopenfilename called, active window changes , focus changes it. in first case focus moved treeview item, in second case moved editor itself! results in deletion of editor because of 'focus out' event.

it important situation doesn't happen if 'dontusenativedialog' flag set when file dialog created. therefore should bug in qt's window management between native windows , qt widgets.

as workaround of bug suggest following solution: before making call getopenfilename set focus button itself.

    m_pui->runsetupbtn->setfocus();      auto qfilename = qfiledialog::getopenfilename(this,             "select application run",             qstring(),             "executable files (*.exe)");

the other workaround use 'dontusenativedialog' flag, resulting file dialog doesn't native, in fact quite ugly. if has better solution, feel free share.


Comments

Post a Comment

Popular posts from this blog

java - Suppress Jboss version details from HTTP error response -

-
my jboss verson jboss eap 6.3 when kind of error response sent jboss, adds server information response. following sample row response: http/1.1 400 bad request server: apache-coyote/1.1 content-type: text/html;charset=utf-8 content-length: 2391 date: tue, 19 jul 2016 09:30:46 gmt connection: close jboss web/7.4.8.final-redhat-4 - jbweb000064: error report jbweb000065: http status 400 - org.codehaus.jackson.map.jsonmappingexception: can not construct instance of mybean.type string value 'xyz': value not 1 of declared enum instance names @ [source: org.jboss.resteasy.core.interception.messagebodyreadercontextimpl$inputstreamwrapper@5e421c2b; line: 14, column: 26] (through reference chain: requestargs["request"]) jbweb000309: type jbweb000067: status report jbweb000068: message org.codehaus.jackson.map.jsonmappingexception: can not construct instance of mybean.type string value 'xyz': value not 1 of declared enum instance names @ [source: org.jboss...
Read more

gridview - Yii2 DataPorivider $totalSum for a column -

-
i have order , ordersearch models. in order list (actionindex) gridview there filtering , sorting. on of columns in order order_total (sum of products in order). i need implement sum of order_total in gridview. if manually counting activedataprovider->getmodels() array_map spend 3 seconds 3000 orders (localhost). don't want miss time. i see 2 ways make faster: create cache every filter , update lifetime (horrible) the interesting can right in ordersearch->search() method $query method. don't understand how can pass in controller. example of code 2nd way: class ordersearch extends order { public $totalsum; public function search($params) { $query = order::find(); $dataprovider = new activedataprovider([ 'query' => $query, ]); $this->load($params); $this->totalsum = $query->sum('order_total'); // works fast return $dataprovider; } } after i...
Read more

Sass watch command compiles .scss files before full sftp upload -

-
i use winscp download , edit .scss files , sass on linux (on server) compile them .css . after saving file, use: sass scss/style.scss css/style.css , replaces css file compiled sccs. the problem i want skip part return command line after editing scss file, sake of automation , saving time. but, if use watch command: sass --watch scss/style.scss:css/style.css synchronize 2 files, alerts nonexistent css errors pop up: change detected to: scss/style.scss error scss/style.scss (line 232: invalid css after "...ht: bold; line-": expected "{", "") note that when file uploads quicker usual (sometimes happens) watch command job, no errors. this because, when file upload takes time, sass compiles scss file (on server) before uploaded remote folder. thus, compiles part of file, resulting in css errors. is there way set timer watch command waits few seconds after detects changes , before compiling? any other way overcome is, of course, ...
Read more