Hello!
Try to set child sub-layouts instead of child sub-containers.
When I used layouts in Wt, I found the following rule: do not call
setLayout and addWidget of same instance of WContainerWidget.
Regards,
Boris Nagaev
On Thu, Nov 21, 2013 at 7:45 PM, Randy Yates
<ya...@digitalsignallabs.com> wrote:
> Hi,
>
> I am brand new to Wt so please excuse (and help correct) any ignorance
> on my part.
>
> I am trying to put together a very basic framework using layouts. The
> paradigm is the entire web page is a vboxlayout with each major page
> component (login, header, content, footer, etc.) is handled by a custom
> class with an hboxlayout. Each of these custom classes inherit from
> WContainerWidget and have their own layout manager, like so:
>
> #ifndef GCFLOGIN_H
> #define GCFLOGIN_H
> #include <Wt/WContainerWidget>
> #include <Wt/WHBoxLayout>
>
> class GCFLogin : public Wt::WContainerWidget
> {
> public:
> /* functions */
> GCFLogin();
>
> /* elements */
> Wt::WHBoxLayout* layout;
>
> private:
> };
>
> #endif
>
> and so the main app would be something like this:
>
> #include <iostream>
> #include <Wt/WApplication>
> #include <Wt/WContainerWidget>
> #include <Wt/WVBoxLayout>
> #include <Wt/WHBoxLayout>
> #include <Wt/WText>
> #include "gcf.h"
>
> GCFApplication::GCFApplication(const Wt::WEnvironment& env)
> : Wt::WApplication(env)
> {
> std::cout << "GCFApplication starting" << std::endl;
> appName = "Grace Christian Fellowship Church";
> setTitle(appName);
> root()->resize(400, 600);
>
> layout = new Wt::WVBoxLayout();
> root()->setLayout(layout);
>
> gcfLogin = new GCFLogin();
> //layout->addItem(gcfLogin->layout);
> // layout->addLayout(gcfLogin->layout);
> root()->addWidget(gcfLogin);
>
> this->instance()->styleSheet().addRule("BODY", "background-color:
> #FFFFFF;");
> this->instance()->styleSheet().addRule("#login", "background-color:
> #0000FF; color: #000000; padding: 0.1em 0.5em;");
>
> std::cout << "GCFApplication ending" << std::endl;
> }
>
> Wt::WApplication *createApplication(const Wt::WEnvironment& env)
> {
> return new GCFApplication(env);
> }
>
> int main(int argc, char **argv)
> {
> return Wt::WRun(argc, argv, &createApplication);
> }
>
> The problem I'm having is that the widgets in my GCFLogin class are not
> being rendered; all I see when I run this code is a blank page.
>
> I'm also not sure how the main container (WApplication->root()) and the
> "sub"-containers, and the main layout GCF::layout and the sub-layouts
> GCFLogin::layout are supposed to hang together. In my current code I'm
> just doing an addWidget in the mai app, but I'm not sure if a
> GCF::layout->addLayout(GCFLogin->layout) is required (in addition or
> instead) or what.
>
> So I'm just guessing in the dark here - I don't see explicit
> explanations in the doxygen class documentation that explains this.
> Maybe I missed it.
>
> In any case, a little guidance would be much appreciated. I'm attaching
> the project files.
> --
> Randy Yates
> Digital Signal Labs
> http://www.digitalsignallabs.com
>
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