c++ - How to draw line behind buttons in Qt? -


question

in custom widget, i'd draw lines (using qpainter) connect buttons in qgridlayout. lines shall behind buttons, in order to

  • a) not interfere buttons in between
  • b) allow starting lines in center of buttons, not edges

considering ideas this question, realize simple, basic version running in gui application (source code below).

as long use qpushbutton standard qt style, works charm (left), but, want use custom style, lines overlap (right):

qt style buttons custom style buttons

what property or mechanism causing behavior?

code

myframe.h:

#include <qframe>  class myframe : public qframe { public:     myframe();     virtual ~myframe() = default; };

myframe.cpp:

#include "myframe.h"  #include "linedrawwidget.h"  #include <qvboxlayout> #include <qgridlayout> #include <qpushbutton> #include <qbuttongroup>  myframe::myframe() {     auto* mainlayout = new qvboxlayout(this);     auto* buttonlayout = new qgridlayout();      qpushbutton* button;     auto* buttons = new qbuttongroup();     (int = 0; < 3; ++i) {         button = new qpushbutton();         button->settext(qstring::number(i+1));         button->setfixedheight(40);         button->setfixedwidth(40);         button->setstylesheet("qpushbutton { color : black; background-color : white; }");         button->setstylesheet("qpushbutton { border-style : outset; border-color: black; border-width: 2px; border-radius: 6px; }");         buttonlayout->addwidget(button);         buttons->addbutton(button, i);     }      auto* linedraw = new linedrawwidget(             buttons->button(0),             buttons->button(2));     linedraw->setlayout(buttonlayout);     mainlayout->addwidget(linedraw); }

linedrawwidget.h:

#include <qwidget>  class linedrawwidget : public qwidget { public:     linedrawwidget(             qwidget* from,             qwidget* to,             qwidget* parent = nullptr);     virtual ~linedrawwidget() = default;  protected:     virtual void paintevent(qpaintevent* e) final override;  private:     qwidget* _from;     qwidget* _to; };

linedrawwidget.cpp:

#include "linedrawwidget.h"  #include <qpainter>  linedrawwidget::linedrawwidget(         qwidget* from,         qwidget* to,         qwidget* parent) :         qwidget(parent),         _from(from),         _to(to) {  }  void linedrawwidget::paintevent(qpaintevent* e) {     (void)e;      qpainter painter(this);      qpoint start =  _from->maptoglobal(_from->rect().bottomleft());     qpoint end = _to->maptoglobal(_to->rect().topright());     painter.drawline(mapfromglobal(start), mapfromglobal(end)); }

i think problem 2 separate calls setstyle single qpushbutton -- second call appears reset properties not present in it. try putting in single call...

button->setstylesheet("color : black; background-color : white; border-style : outset; border-color: black; border-width: 2px; border-radius: 6px;");

seems work me.


Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer
Read more

jquery - Responsive Navbar with Sub Navbar -

good day, forgive me nav vocabulary not best. if question confusing apologize. i'm working on navigation bar needs centered on page @ 768px , above. items in nav open (or perhaps toggle) subnav lives directly below. these nav should appear centered on page. i have been able work through responsive portion of nav bar, having main items align vertically , sub nav menu of each item roll out below, , gave them indent separation. working well. however, issue not responsive side, behavior @ width greater 768px. happens toggling menu's sub navigation pushes other main items down page below sub nav. here's code: $(document).ready(function () { //stick in fixed 100% height behind navbar don't wrap $('#slide-nav.navbar-inverse').after($('<div class="inverse" id="navbar-height-col"></div>')); $('#slide-nav.navbar-default').after($('<div id="navbar-height-col"></d
Read more