170 lines
6.8 KiB
C++
170 lines
6.8 KiB
C++
#pragma once
|
|
|
|
#include "view.h"
|
|
|
|
#include <cgv/signal/signal.h>
|
|
|
|
#include "lib_begin.h"
|
|
|
|
namespace cgv {
|
|
namespace gui {
|
|
|
|
/// %gui and %type independent %base class of all controls
|
|
class CGV_API abst_control : public abst_view
|
|
{
|
|
public:
|
|
/// construct from name
|
|
abst_control(const std::string& name);
|
|
/// add default implementation passing the query to the controls() method
|
|
bool shows(const void* ptr) const;
|
|
/// return whether the control controls the value pointed to by ptr
|
|
virtual bool controls(const void* ptr) const = 0;
|
|
/// attach a functor to the value change signal
|
|
virtual void attach_to_value_change(cgv::signal::functor_base* func) = 0;
|
|
/// attach a functor to the value change signal
|
|
virtual void attach_to_check_value(cgv::signal::functor_base* bool_func) = 0;
|
|
};
|
|
|
|
/// ref counted pointer to abst %control
|
|
typedef data::ref_ptr<abst_control> control_ptr;
|
|
|
|
#if _MSC_VER >= 1400
|
|
CGV_TEMPLATE template class CGV_API data::ref_ptr<abst_control>;
|
|
#endif
|
|
|
|
/// %type independent %base class of %control %provider interface
|
|
struct abst_control_provider
|
|
{
|
|
//! overload to check if ptr points to the controlled value
|
|
/*! The method is used when searching controls with find_control.
|
|
The default implementation compares ptr to get_value_void(). */
|
|
virtual bool controls(const void* ptr, void* user_data) const = 0;
|
|
};
|
|
|
|
/*! reimplement the %control %provider for a customized control.
|
|
A %control %provider can be used as argument to the constructor
|
|
of the control class. The provider class also implements an
|
|
overloaded version of the add_control method that takes a
|
|
%control %provider as second argument instead of the reference
|
|
to a value. */
|
|
template <typename T>
|
|
struct control_provider : public abst_control_provider
|
|
{
|
|
/// overload to set the value
|
|
virtual void set_value(const T& value, void* user_data) = 0;
|
|
/// overload to get the value
|
|
virtual const T get_value(void* user_data) const = 0;
|
|
/// the default implementation compares ptr to &get_value().
|
|
virtual bool controls(const void* ptr, void* user_data) const { return false; }
|
|
};
|
|
|
|
/*! gui independent control of a value that has the type of the template argument.
|
|
The value can either be specified as a reference or through the control_provider
|
|
that implements a get and a set method.
|
|
|
|
Before the control changes a value, it
|
|
emits the signal check_value to test if the new value is valid. The check_value
|
|
signal has a boolean return value. All attached callbacks must return true in order
|
|
for the check to be successful. The attached callbacks can also change the new value
|
|
to a valid value. The check_value callbacks should use the get_new_value(), get_value()
|
|
and set_new_value() methods of the control to update the new value and to access the
|
|
current value that has not been changed yet.
|
|
|
|
If the validity check is successful, the value is changed to the new value and the
|
|
value_change signal is emitted. The callbacks attached to this signal can not only
|
|
query the current value with get_value() but also the old value with get_old_value().
|
|
Take care that the get_old_value() cannot be used in the callbacks attached to
|
|
check_value and the get_new_value() method cannot be used in the callbacks attached
|
|
to the value_change signal.
|
|
*/
|
|
template <typename T>
|
|
class control : public abst_control
|
|
{
|
|
private:
|
|
T* value_ptr;
|
|
control_provider<T>* cp;
|
|
T new_value;
|
|
protected:
|
|
// protected function for the setter
|
|
void set_value(const T& v) {
|
|
if (cp)
|
|
cp->set_value(v, value_ptr);
|
|
else {
|
|
*value_ptr = v;
|
|
update_views();
|
|
}
|
|
}
|
|
public:
|
|
/// type of the value check signal
|
|
typedef cgv::signal::bool_signal<control<T>&> value_check_signal_type;
|
|
/// type of the value change signal
|
|
typedef cgv::signal::signal<control<T>&> value_change_signal_type;
|
|
/// construct abstract element from reference to value
|
|
control(const std::string& _name, T& _value) : abst_control(_name), value_ptr(&_value), new_value(_value), cp(0) {
|
|
attach_to_reference(value_ptr);
|
|
}
|
|
/// construct abstract element from control_provider
|
|
control(const std::string& _name, T* _value) : abst_control(_name) {
|
|
value_ptr = _value;
|
|
new_value = *_value;
|
|
cp = 0;
|
|
attach_to_reference(value_ptr);
|
|
}
|
|
//! this constructor allows contruction from control_provider with user data or if the pointer
|
|
//! to the control_provider is null, interpret the pointer to the user data as the value pointer
|
|
//! and act as the previous constructor.
|
|
control(const std::string& _name, abst_control_provider* _cp, void* user_data) : abst_control(_name), cp(0) {
|
|
if (_cp) {
|
|
cp = static_cast<control_provider<T>*>(_cp);
|
|
(void*&)value_ptr = user_data;
|
|
new_value = cp->get_value(user_data);
|
|
}
|
|
else {
|
|
value_ptr = (T*)user_data;
|
|
new_value = *value_ptr;
|
|
attach_to_reference(value_ptr);
|
|
}
|
|
}
|
|
//! this signal is sent when the user triggered a change of value in order to check whether the new value is valid.
|
|
/*! Use get_new_value() and set_new_value() to get and correct the new value. Return true if the new
|
|
value is ok or could be corrected, false otherwise. */
|
|
cgv::signal::bool_signal<control<T>&> check_value;
|
|
//! this signal is sent after the user triggered a change of value and the check_value succeeded.
|
|
/*! You can access the old value with get_old_value() method. */
|
|
cgv::signal::signal<control<T>&> value_change;
|
|
/// return a reference to the current value
|
|
const T get_value() const { return cp ? cp->get_value(value_ptr) : *value_ptr; }
|
|
/// return the new value to the callbacks attached to the check_value signal
|
|
const T& get_new_value() const { return new_value; }
|
|
/// set a different new value from the callbacks attached to the check_value signal
|
|
void set_new_value(const T& nv) { new_value = nv; }
|
|
/// return the old value to the callbacks attached to the change_value signal
|
|
const T& get_old_value() const { return new_value; }
|
|
/// set new value only if check_value signal succeeds and send value_change signal. Return true if value has been changed.
|
|
bool check_and_set_value(const T& nv) {
|
|
set_new_value(nv);
|
|
if (check_value(*this)) {
|
|
T tmp_value = get_value();
|
|
set_value(this->get_new_value());
|
|
set_new_value(tmp_value);
|
|
value_change(*this);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
/// check whether the value represented by this element is pointing to the passed pointer
|
|
bool controls(const void* ptr) const { return cp ? cp->controls(ptr,value_ptr) : (value_ptr == ptr); }
|
|
/// attach a functor to the value change signal
|
|
void attach_to_value_change(cgv::signal::functor_base* func) {
|
|
value_change.connect_abst(func);
|
|
}
|
|
/// attach a functor to the value change signal
|
|
void attach_to_check_value(cgv::signal::functor_base* bool_func) {
|
|
check_value.connect_abst(bool_func);
|
|
}
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#include <cgv/config/lib_end.h>
|