/usr/include/Wt/WTimer is in libwt-dev 3.3.3+dfsg-4.1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 | // This may look like C code, but it's really -*- C++ -*-
/*
* Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
*
* See the LICENSE file for terms of use.
*/
#ifndef WTIMER_H_
#define WTIMER_H_
#include <Wt/WObject>
#include <Wt/WSignal>
#include <Wt/WEvent>
#ifndef WT_TARGET_JAVA
#include <boost/bind.hpp>
#endif // WT_TARGET_JAVA
namespace Wt {
class WTimerWidget;
class Time;
/*! \class WTimer Wt/WTimer Wt/WTimer
* \brief A utility class which provides timer signals and single-shot timers.
*
* To use a timer, create a %WTimer instance, set the timer
* interval using setInterval() and connect a slot to the timeout signal.
* Then, start the timer using start(). An active timer may be cancelled
* at any time using stop().
*
* By default, a timer will continue to generate events until you
* stop() it. To create a timer that will fire only once, use
* setSingleShot().
* \if cpp
* There is also a convience static method singleShot().
* \endif
*
* When connecting stateless slot implementations to the timeout
* signal, these stateless slot implementations will be used as for
* any other signal (when Ajax is available).
*
* In clients without (enabled) JavaScript support, the minimum
* resolution of the timer is one second (1000 milli-seconds), and it
* is probably wise to use timers sparingly.
*
* A WTimer is only usable inside of a %Wt event loop.
* \if cpp
* If you want to create a timer outside the %Wt event loop, take a look at asio deadline_timer.
* \else
* If you want to create a timer outside the %Wt event loop, take a look at {javadoclink java.util.Timer}.
* \endif
*
* \if cpp
* Timers are one way to provide updates of a web page without the
* user generating an event. Alternatively you may consider
* server-initiated updates, see WApplication::enableUpdates().
* \endif
*
* \if cpp
* Usage example:
* \code
* // setup a timer which calls MyClass::timeout() every 2 seconds, until timer->stop() is called.
* Wt::WTimer *timer = new Wt::WTimer();
* timer->setInterval(2000);
* timer->timeout().connect(this, &MyClass::timeout);
* timer->start();
* \endcode
* \endif
*/
class WT_API WTimer : public WObject
{
public:
/*! \brief Construct a new timer with the given parent.
*/
WTimer(WObject *parent = 0);
/*! \brief Destuctor.
*/
~WTimer();
/*! \brief Returns the interval (msec).
*/
int interval() const { return interval_; }
/*! \brief Sets the interval (msec).
*/
void setInterval(int msec);
/*! \brief Returns if the timer is running.
*/
bool isActive() const { return active_; }
/*! \brief Is this timer set to fire only once.
*/
bool isSingleShot() const { return singleShot_; }
/*! \brief Configures this timer to fire only once.
*
* A Timer is by default not single shot, and will fire continuously,
* until it is stopped.
*
* \if cpp
* \sa singleShot()
* \endif
*/
void setSingleShot(bool singleShot);
#ifndef WT_TARGET_JAVA
/*! \brief This static function calls a slot after a given time interval.
*
* For example, the following code will call this->doSome() after 2
* seconds:
* \code
* WTimer::singleShot(2000, this, &MyClass::doSome);
* \endcode
*/
template <class T, class V>
static void singleShot(int msec, T *receiver, void (V::*method)());
/*! \brief This static function calls a function after a given time interval.
*
* This variant of the overloaded singleShot() method supports a
* template function object (which supports operator ()).
*/
template <class F>
static void singleShot(int msec, const F& f);
#endif // WT_TARGET_JAVA
/*! \brief Starts the timer.
*
* The timer will be isActive(), until either the interval has
* elapsed, after which the timeout signal is activated,
* or until stop() is called.
*/
void start();
/*! \brief Stops the timer.
*
* You may stop the timer during its timeout(), or cancel a running timer
* at any other time.
*
* \sa start()
*/
void stop();
/*! \brief %Signal emitted when the timer timeouts.
*
* The %WMouseEvent does not provide any meaningful information but is
* an implementation artefact.
*/
EventSignal<WMouseEvent>& timeout();
private:
WTimerWidget *timerWidget_;
bool singleShot_;
bool selfDestruct_;
int interval_;
bool active_;
bool timeoutConnected_;
Time *timeout_;
void gotTimeout();
void setSelfDestruct();
int getRemainingInterval() const;
friend class WTimerWidget;
};
#ifndef WT_TARGET_JAVA
template <class T, class V>
void WTimer::singleShot(int msec, T *receiver, void (V::*method)())
{
singleShot(msec, boost::bind(method, receiver));
}
template <class F>
void WTimer::singleShot(int msec, const F& f)
{
WTimer *timer = new WTimer();
timer->setSingleShot(true);
timer->setInterval(msec);
timer->setSelfDestruct();
timer->start();
timer->timeout().connect(f);
}
#endif // WT_TARGET_JAVA
}
#endif // WTIMER_H_
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