Wt examples
3.3.12
build
witty-DHLR6e
witty-3.3.12+dfsg
examples
hello
hello.C
Go to the documentation of this file.
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/*
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* Copyright (C) 2008 Emweb bvba, Heverlee, Belgium.
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*
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* See the LICENSE file for terms of use.
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*/
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#include <Wt/WApplication>
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#include <Wt/WBreak>
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#include <Wt/WContainerWidget>
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#include <Wt/WLineEdit>
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#include <Wt/WPushButton>
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#include <Wt/WText>
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// c++0x only, for std::bind
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// #include <functional>
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using namespace
Wt
;
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/*
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* A simple hello world application class which demonstrates how to react
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* to events, read input, and give feed-back.
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*/
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class
HelloApplication
:
public
WApplication
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{
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public
:
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HelloApplication
(
const
WEnvironment& env);
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private
:
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WLineEdit *
nameEdit_
;
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WText *
greeting_
;
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void
greet();
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};
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/*
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* The env argument contains information about the new session, and
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* the initial request. It must be passed to the WApplication
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* constructor so it is typically also an argument for your custom
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* application constructor.
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*/
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HelloApplication::HelloApplication
(
const
WEnvironment& env)
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: WApplication(env)
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{
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setTitle(
"Hello world"
);
// application title
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root()->addWidget(
new
WText(
"Your name, please ? "
));
// show some text
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nameEdit_
=
new
WLineEdit(root());
// allow text input
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nameEdit_
->setFocus();
// give focus
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WPushButton *button
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=
new
WPushButton(
"Greet me."
, root());
// create a button
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button->setMargin(5, Left);
// add 5 pixels margin
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root()->addWidget(
new
WBreak());
// insert a line break
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greeting_
=
new
WText(root());
// empty text
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/*
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* Connect signals with slots
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*
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* - simple Wt-way
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*/
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button->clicked().connect(
this
, &
HelloApplication::greet
);
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/*
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* - using an arbitrary function object (binding values with boost::bind())
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*/
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nameEdit_
->enterPressed().connect
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(boost::bind(&
HelloApplication::greet
,
this
));
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/*
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* - using a c++0x lambda:
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*/
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// button->clicked().connect(std::bind([=]() {
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// greeting_->setText("Hello there, " + nameEdit_->text());
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// }));
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}
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void
HelloApplication::greet
()
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{
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/*
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* Update the text, using text input into the nameEdit_ field.
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*/
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greeting_
->setText(
"Hello there, "
+
nameEdit_
->text());
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}
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WApplication *
createApplication
(
const
WEnvironment& env)
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{
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/*
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* You could read information from the environment to decide whether
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* the user has permission to start a new application
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*/
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return
new
HelloApplication
(env);
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}
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int
main
(
int
argc,
char
**argv)
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{
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/*
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* Your main method may set up some shared resources, but should then
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* start the server application (FastCGI or httpd) that starts listening
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* for requests, and handles all of the application life cycles.
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*
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* The last argument to WRun specifies the function that will instantiate
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* new application objects. That function is executed when a new user surfs
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* to the Wt application, and after the library has negotiated browser
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* support. The function should return a newly instantiated application
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* object.
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*/
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return
WRun(argc, argv, &
createApplication
);
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}
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Wt
Definition:
AddresseeEdit.h:16
HelloApplication::HelloApplication
HelloApplication(const WEnvironment &env)
Definition:
hello.C:41
HelloApplication::nameEdit_
WLineEdit * nameEdit_
Definition:
hello.C:29
createApplication
WApplication * createApplication(const WEnvironment &env)
Definition:
hello.C:87
HelloApplication::greeting_
WText * greeting_
Definition:
hello.C:30
HelloApplication::greet
void greet()
Definition:
hello.C:79
main
int main(int argc, char **argv)
Definition:
hello.C:96
HelloApplication
Definition:
hello.C:23
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