aqt::cassowary::Variable Class Reference

Represents a variable whose value will be determined by a constraint solver. More...

#include <aqt/cassowary/Variable.hpp>

Inheritance diagram for aqt::cassowary::Variable:

Public Member Functions
	Variable (QQuickItem *pParent=nullptr)
double	value () const
void	setValue (double)
Q_SIGNAL void	valueChanged (double value)
Q_SIGNAL void	initialChanged (double initial)
const rhea::variable &	variableImpl () const
Public Member Functions inherited from aqt::cassowary::Contextual
	Contextual (QQuickItem *pParent=nullptr)
std::shared_ptr< Context >	context ()
std::shared_ptr< const Context >	context () const
Q_SIGNAL void	contextChanged ()
Q_SIGNAL void	extendChanged (aqt::cassowary::Contextual *extend)
Q_INVOKABLE void	commit ()
	Applies all the changes associated to the context used by this contextual. More...
Q_INVOKABLE void	defer (QJSValue cb)
	Executes the callback cb at the end of the next phase of updates in the solver, but before the changes are propagated to the bindings.
void	defer (Context::Callback cb)
void	defer_ (Context::Callback cb)
template<typename... Args>
void	log (Args &&...args)
	Used to log a debug trace, that may be visible when the current context's debug property is set. More...

Protected Member Functions
void	addIn (Context &) override
void	removeIn (Context &) override
Protected Member Functions inherited from aqt::cassowary::Contextual
void	add ()
void	remove ()
template<typename Fn >
void	update (Fn &&cb)
template<typename Fn >
Context::Callback	guarded (Fn fn)
void	updateContext ()
Contextual *	provider ()
virtual std::shared_ptr< Context >	provided ()

Properties
double	value
	Contains the current value as determined by the constrained solver. More...
double	initial
	Sets the initial value of this variable. More...
Properties inherited from aqt::cassowary::Contextual
aqt::cassowary::Contextual	extend
	If non-null, this contextual will use the same context as used by this contextual.

Detailed Description

Represents a variable whose value will be determined by a constraint solver.

Example

Solver {
  Variable {
    id: vX
    initial: 100
  }
}
Rectangle {
  x: vX.value
}

Import in QML

import Aqt.Cassowary 1.0

Property Documentation

double aqt::cassowary::Variable::initial

Sets the initial value of this variable.

If NaN is set, the variable will have an implicit initial value of 0. However, explicitly set initial values will are considered strong, but not the implicit ones even if the later variable has supporting stay constraints.

See also

Stay

Todo:

Like for the value property setter, it would be nice to be able to specify the strength and weight of this suggestion to the solver.

double aqt::cassowary::Variable::value

readwrite

Contains the current value as determined by the constrained solver.

The value will be updated automatically after the next solver update, in the presence of changes in the constraints of the system.

Note

Setting the value only suggests the setting to the solver. Also, the suggestion is not applied inmediatelly, but in the next solver update.

Todo:

Add syntax to specify the strength and weight of the suggestions done via the setter.

---

The documentation for this class was generated from the following file:

• src/aqt/cassowary/Variable.hpp