如何在QT中使用标志作为自定义小部件属性类型?
我有麻烦使用标志作为QT自定义小部件属性类型。期望的属性不会显示在QT Designer属性编辑器上。如何在QT中使用标志作为自定义小部件属性类型?
的代码如下:
#ifndef SVBASICDEMO_H
#define SVBASICDEMO_H
#include <QString>
#include <QtUiPlugin/QDesignerExportWidget>
#include <QWidget>
#include <QLabel>
#include "svbasicwidget.h"
QT_BEGIN_NAMESPACE
namespace Company {
namespace Product {
namespace Widget {
namespace Basic {
class QDESIGNER_WIDGET_EXPORT SvBasicDemo : public SvBasicWidget
{
Q_OBJECT
Q_FLAGS(SvBasicDemo::AccessTypes)
Q_PROPERTY(QString url_prop MEMBER url_prop NOTIFY propertyChange)
Q_PROPERTY(Priority enum_prop MEMBER enum_prop NOTIFY propertyChange)
Q_PROPERTY(AccessTypes flag_prop MEMBER flag_prop NOTIFY propertyChange)
Q_PROPERTY(Qt::Alignment flag_prop_2 MEMBER flag_prop_2 NOTIFY propertyChange)
Q_SIGNALS:
void propertyChange();
public slots:
//更新属性的槽
void updateProperty();
public:
SvBasicDemo(QWidget *parent = 0);
virtual void refresh_binding_cb();
virtual QString help_info() const;
enum Priority { High, Low, VeryHigh, VeryLow };
Q_ENUM(Priority)
enum AccessType { Read = 0x1, Write = 0x2 };
Q_DECLARE_FLAGS(AccessTypes, AccessType)
private:
QString url_prop;
Priority enum_prop;
AccessTypes flag_prop;
Qt::Alignment flag_prop_2;
QLabel label;
};
Q_DECLARE_OPERATORS_FOR_FLAGS(SvBasicDemo::AccessTypes)
}
}
}
}
QT_END_NAMESPACE
#endif
你可以看到属性enum_prop(使用自定义枚举)和flag_prop_2(使用内置在标志Qt :: Alignment)按预期工作。但属性flag_prop缺失。
我研究了“%QT_ROOT%\ Qt5.6.0 \ 5.6 \ msvc2013 \ include \ QtWidgets \ qgraphicsview.h”中的代码,并没有弄清楚原因。
任何人都可以给我一些暗示,为什么它不能按预期工作?提前致谢。
经过多次尝试,终于解决了这个问题。关键点是:
看来MEMBER关键字不能与Q_FLAGS属性一起使用;
-
Q_DECLARE_OPERATORS_FOR_FLAGS宏必须在全局名称空间中使用;
命名空间公司{
namespace Product { namespace Widget { namespace Basic { class QDESIGNER_WIDGET_EXPORT SvBasicDemo : public SvBasicWidget { Q_OBJECT Q_FLAGS(AccessTypes) Q_PROPERTY(QString url_prop MEMBER url_prop NOTIFY propertyChange) Q_PROPERTY(Priority enum_prop MEMBER enum_prop NOTIFY propertyChange) // Q_PROPERTY(AccessTypes flag_prop MEMBER flag_prop NOTIFY propertyChange) // Cannot use MEMBER here, otherwise, the property will not show on qt designer property editor. I don't know why. Q_PROPERTY(AccessTypes flag_prop READ getAccessTypes WRITE setAccessTypes) Q_PROPERTY(Qt::Alignment flag_prop_3 MEMBER flag_prop_2 NOTIFY propertyChange) Q_SIGNALS: void propertyChange(); public slots: void updateProperty(); public: SvBasicDemo(QWidget *parent = 0); virtual void refresh_binding_cb(); virtual QString help_info() const; enum Priority { High, Low, VeryHigh, VeryLow }; Q_ENUM(Priority) enum AccessType { None = 0x0, Read = 0x1, Write = 0x2 }; Q_DECLARE_FLAGS(AccessTypes, AccessType) inline AccessTypes getAccessTypes() const { return flag_prop; } inline void setAccessTypes(AccessTypes features) { flag_prop = features; } private: QString url_prop; Priority enum_prop; AccessTypes flag_prop; Qt::Alignment flag_prop_2; QLabel label; }; } } } } // must use this macro outside namespace Q_DECLARE_OPERATORS_FOR_FLAGS(Company::Product::Widget::Basic::SvBasicDemo::AccessTypes)
您是否添加Q_DECLARE_FLAGS宏?另见Q_FLAGS()
这正确的用法是WindowsStateFlags定义的例子:
class MyClass
{
public:
enum Option {
NoOptions = 0x0,
ShowTabs = 0x1,
ShowAll = 0x2,
SqueezeBlank = 0x4
};
Q_DECLARE_FLAGS(Options, Option)
Q_FLAGS(Options)
...
};
Q_DECLARE_OPERATORS_FOR_FLAGS(MyClass::Option)
你必须添加属性宏和可调用函数来获取CURREN选项:
Q_PROPERTY(Option option READ getOption())
Q_INVOKABLE Option getOption() const;
并注册元模型qRegisterMetaType或Q_DECLARE_METATYPE():
Q_DECLARE_METATYPE(MyClass::Option);
非常感谢您的回复。在我原来的文章中,我使用下面的代码在qgraphicsview.h中使用这些宏,如下所示:'Q_FLAGS(SvBasicDemo :: AccessTypes)Q_DECLARE_FLAGS(AccessTypes,AccessType)Q_DECLARE_OPERATORS_FOR_FLAGS(SvBasicDemo :: AccessTypes)'''Is我的代码有问题吗?有没有关于命名空间的事情? – ricky
可能是你不得不暴露潜在的枚举元对象模型。尝试添加'Q_ENUM(AccessType)' –
@king_nak仍然无法工作 – ricky