The QDesignerPropertyEditorInterface class allows you to query and manipulate the current state of Qt Designer's property editor. 更多...
| 头： | #include <QDesignerPropertyEditorInterface> |
| qmake: | QT += designer |
| 继承： | QWidget |
| QDesignerPropertyEditorInterface (QWidget * parent , Qt::WindowFlags flags = Qt::WindowFlags()) | |
| virtual | ~QDesignerPropertyEditorInterface () |
| virtual QDesignerFormEditorInterface * | core () const |
| virtual QString | currentPropertyName () const = 0 |
| virtual bool | isReadOnly () const = 0 |
| virtual QObject * | 对象 () const = 0 |
| 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 |
| void | propertyChanged (const QString & name , const QVariant & value ) |
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 .
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 ().