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#ifndef DEFERRED_WIDGET_H_
#define DEFERRED_WIDGET_H_
#include <Wt/WContainerWidget>
/*
* A utility container widget which defers creation of its single
* child widget until the container is loaded (which is done on-demand
* by a WMenu). The constructor takes the create function for the
* widget as a parameter.
*
* We use this to defer widget creation until needed, which also defers
* loading auxiliary javascript libraries.
*/
#if !defined(WT_TARGET_JAVA)
template <typename Function>
class DeferredWidget : public Wt::WContainerWidget
{
public:
DeferredWidget(Function f)
: f_(f) { }
private:
void load() {
addWidget(f_());
WContainerWidget::load();
}
Function f_;
};
template <typename Function>
DeferredWidget<Function> *deferCreate(Function f)
{
return new DeferredWidget<Function>(f);
}
#else
class DeferredWidget : public Wt::WContainerWidget {
public:
DeferredWidget(boost::bound f) {}
};
DeferredWidget *deferCreate(boost::bound b)
{
return new DeferredWidget(b);
}
#endif
#endif // DEFERRED_WIDGET_H_
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