内容

• 公共函数
• 公共槽
• 信号
• 详细描述

QDesignerPropertyEditorInterface Class

The QDesignerPropertyEditorInterface class allows you to query and manipulate the current state of Qt Designer's property editor. 更多...

头：	#include <QDesignerPropertyEditorInterface>
CMake:	find_package(Qt6 COMPONENTS Designer REQUIRED) target_link_libraries(mytarget PRIVATE Qt6::Designer)
qmake:	QT += designer
继承：	QWidget

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公共函数

	QDesignerPropertyEditorInterface (QWidget * parent , Qt::WindowFlags flags = {})
virtual	~QDesignerPropertyEditorInterface ()
virtual QDesignerFormEditorInterface *	core () const
virtual QString	currentPropertyName () const = 0
virtual bool	isReadOnly () const = 0
virtual QObject *	对象 () const = 0

公共槽

virtual void	setObject (QObject * object ) = 0
virtual void	setPropertyValue (const QString & name , const QVariant & value , bool changed = true) = 0
virtual void	setReadOnly (bool readOnly ) = 0

信号

void	propertyChanged (const QString & name , const QVariant & value )

详细描述

QDesignerPropertyEditorInterface contains a collection of functions that is typically used to query the property editor for its current state, and several slots manipulating it's state. The interface also provide a signal, propertyChanged (), which is emitted whenever a property changes in the property editor. The signal's arguments are the property that changed and its new value.

For example, when implementing a custom widget plugin, you can connect the signal to a custom slot:

        QDesignerPropertyEditorInterface *propertyEditor = 0;
        propertyEditor = formEditor->propertyEditor();
        connect(propertyEditor, SIGNAL(propertyChanged(QString,QVariant)),
                this, SLOT(checkProperty(QString,QVariant)));
					

Then the custom slot can check if the new value is within the range we want when a specified property, belonging to a particular widget, changes:

        void checkProperty(QString property, QVariant value) {
            QDesignerPropertyEditorInterface *propertyEditor = 0;
            propertyEditor = formEditor->propertyEditor();
            QObject *object = propertyeditor->object();
            MyCustomWidget *widget = qobject_cast<MyCustomWidget>(object);
            if (widget && property == aProperty && value != expectedValue)
                {...}
        }
					

The QDesignerPropertyEditorInterface class is not intended to be instantiated directly. You can retrieve an interface to Qt Designer 's property editor using the QDesignerFormEditorInterface::propertyEditor () function. A pointer to Qt Designer 's current QDesignerFormEditorInterface object ( formEditor in the examples above) is provided by the QDesignerCustomWidgetInterface::initialize () function's parameter. When implementing a custom widget plugin, you must subclass the QDesignerCustomWidgetInterface to expose your plugin to Qt Designer .

The functions accessing the property editor are the core () function that you can use to retrieve an interface to the form editor, the currentPropertyName () function that returns the name of the currently selected property in the property editor, the 对象 () function that returns the currently selected object in Qt Designer 's workspace, and the isReadOnly () function that returns true if the property editor is write proteced (otherwise false).

The slots manipulating the property editor's state are the setObject () slot that you can use to change the currently selected object in Qt Designer 's workspace, the setPropertyValue () slot that changes the value of a given property and the setReadOnly () slot that control the write protection of the property editor.

另请参阅 QDesignerFormEditorInterface .

成员函数文档编制

QDesignerPropertyEditorInterface:: QDesignerPropertyEditorInterface ( QWidget * parent , Qt::WindowFlags flags = {})

Constructs a property editor interface with the given parent and the specified window flags .

[signal] void QDesignerPropertyEditorInterface:: propertyChanged (const QString & name , const QVariant & value )

This signal is emitted whenever a property changes in the property editor. The property that changed and its new value are specified by name and value 分别。

另请参阅 setPropertyValue ().

[pure virtual slot] void QDesignerPropertyEditorInterface:: setObject ( QObject * object )

Changes the currently selected object in Qt Designer 's workspace, to object .

另请参阅 对象 ().

[pure virtual slot] void QDesignerPropertyEditorInterface:: setPropertyValue (const QString & name , const QVariant & value , bool changed = true)

Sets the value of the property specified by name to value .

In addition, the property is marked as changed in the property editor, i.e. its value is different from the default value.

另请参阅 currentPropertyName () 和 propertyChanged ().

[pure virtual slot] void QDesignerPropertyEditorInterface:: setReadOnly ( bool readOnly )

若 readOnly is true, the property editor is made write protected; otherwise the write protection is removed.

另请参阅 isReadOnly ().

[虚拟] QDesignerPropertyEditorInterface:: ~QDesignerPropertyEditorInterface ()

Destroys the property editor interface.

[虚拟] QDesignerFormEditorInterface *QDesignerPropertyEditorInterface:: core () const

Returns a pointer to Qt Designer 's current QDesignerFormEditorInterface 对象。

[pure virtual] QString QDesignerPropertyEditorInterface:: currentPropertyName () const

Returns the name of the currently selected property in the property editor.

另请参阅 setPropertyValue ().

[pure virtual] bool QDesignerPropertyEditorInterface:: isReadOnly () const

Returns true if the property editor is write protected; otherwise false.

另请参阅 setReadOnly ().

[pure virtual] QObject *QDesignerPropertyEditorInterface:: 对象 () const

Returns the currently selected object in Qt Designer 's workspace.

另请参阅 setObject ().