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Calling setHiddenKeepsGeometry() causes page to not render ยป setHiddenKeepsGeometry-issue.cpp

Nathan Ridge, 05/16/2013 07:54 AM

 

/*
* Copyright (C) 2008 Emweb bvba, Heverlee, Belgium.
*
* See the LICENSE file for terms of use.
*/

#include <Wt/WApplication>
#include <Wt/WBreak>
#include <Wt/WContainerWidget>
#include <Wt/WLineEdit>
#include <Wt/WPushButton>
#include <Wt/WText>
#include <Wt/WHBoxLayout>

// c++0x only, for std::bind
// #include <functional>

using namespace Wt;

/*
* A simple hello world application class which demonstrates how to react
* to events, read input, and give feed-back.
*/
class HelloApplication : public WApplication
{
public:
HelloApplication(const WEnvironment& env);

private:
WLineEdit *nameEdit_;
WText *greeting_;

void greet();
};

/*
* The env argument contains information about the new session, and
* the initial request. It must be passed to the WApplication
* constructor so it is typically also an argument for your custom
* application constructor.
*/
HelloApplication::HelloApplication(const WEnvironment& env)
: WApplication(env)
{
setTitle("Hello world"); // application title

WLayout* layout = new WHBoxLayout();
root()->setLayout(layout);
layout->addWidget(new WText("Your name, please ? ")); // show some text
nameEdit_ = new WLineEdit(); // allow text input
layout->addWidget(nameEdit_);
nameEdit_->setFocus(); // give focus

WPushButton *button
= new WPushButton("Greet me."); // create a button
button->setHiddenKeepsGeometry(true);
button->setHidden(true);
layout->addWidget(button);
button->setMargin(5, Left); // add 5 pixels margin

layout->addWidget(new WBreak()); // insert a line break

greeting_ = new WText(); // empty text
layout->addWidget(greeting_);

/*
* Connect signals with slots
*
* - simple Wt-way
*/
button->clicked().connect(this, &HelloApplication::greet);

/*
* - using an arbitrary function object (binding values with boost::bind())
*/
nameEdit_->enterPressed().connect
(boost::bind(&HelloApplication::greet, this));

/*
* - using a c++0x lambda:
*/
// b->clicked().connect(std::bind([=]() {
// greeting_->setText("Hello there, " + nameEdit_->text());
// }));
}

void HelloApplication::greet()
{
/*
* Update the text, using text input into the nameEdit_ field.
*/
greeting_->setText("Hello there, " + nameEdit_->text());
}

WApplication *createApplication(const WEnvironment& env)
{
/*
* You could read information from the environment to decide whether
* the user has permission to start a new application
*/
return new HelloApplication(env);
}

int main(int argc, char **argv)
{
/*
* Your main method may set up some shared resources, but should then
* start the server application (FastCGI or httpd) that starts listening
* for requests, and handles all of the application life cycles.
*
* The last argument to WRun specifies the function that will instantiate
* new application objects. That function is executed when a new user surfs
* to the Wt application, and after the library has negotiated browser
* support. The function should return a newly instantiated application
* object.
*/
return WRun(argc, argv, &createApplication);
}
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