1. Qt Designer Edit Signals Slots App
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The QDesignerPropertyEditorInterface class allows you to query and manipulate the current state of Qt Designer's property editor. More...

Public Functions

Use Signals and Slots Editing Mode for connecting predefined Qt signals directly to predefined Qt slots. So for 'Close' button on a simple dialog, you can just drag a connection from the button to the dialog, select the clicked signal and the reject slot, click 'OK', and there would be nothing more to do. For adding those custom slots, in addition to defining them in header and implementation files, they also should be added in priori by right clicking the QMainWindow, going to change signals and slots and manually adding them in the slot panel. This way is simpler than to code signal&slots. QtDesigner Edit -Edit Signals/Slots nicely 'connect' two wiglets using GUI. Works great if the action on destination widget is simple - such as 'clear'. However, this very useful and intuitive GUI stops being user friendly when the action on destination widget gets more complex - such as illustrated bellow. Can't edit signals/slots in designer. Double clicking these presents a menu of objects/signals etc, but on latest QT Creator it's not.

• 214 public functions inherited from QWidget
• 32 public functions inherited from QObject
• 14 public functions inherited from QPaintDevice

Public Slots

• 19 public slots inherited from QWidget
• 1 public slot inherited from QObject

Signals

• 3 signals inherited from QWidget
• 2 signals inherited from QObject

Additional Inherited Members

• 59 properties inherited from QWidget
• 1 property inherited from QObject
• 5 static public members inherited from QWidget
• 11 static public members inherited from QObject
• 35 protected functions inherited from QWidget
• 9 protected functions inherited from QObject
• 1 protected function inherited from QPaintDevice
• 1 protected slot inherited from QWidget

Detailed Description

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

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:

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:

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 object() 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.

See also QDesignerFormEditorInterface.

Member Function Documentation

QDesignerPropertyEditorInterface::QDesignerPropertyEditorInterface(QWidget *parent, Qt::WindowFlagsflags = Qt::WindowFlags())

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

[virtual] QDesignerPropertyEditorInterface::~QDesignerPropertyEditorInterface()

Destroys the property editor interface.

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

Returns a pointer to Qt Designer's current QDesignerFormEditorInterface object.

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

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

See also setPropertyValue().

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

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

See also setReadOnly().

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

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

See also setObject().

[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 respectively.

See also setPropertyValue().

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

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

See also object().

[pure virtual slot] void QDesignerPropertyEditorInterface::setPropertyValue(const QString &name, const QVariant &value, boolchanged = 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.

See also currentPropertyName() and propertyChanged().

[pure virtual slot] void QDesignerPropertyEditorInterface::setReadOnly(boolreadOnly)

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

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See also isReadOnly().

© 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.

One of the most useful basic features of Qt is the support for buddy widgets. A buddy widget accepts the input focus on behalf of a QLabel when the user types the label's shortcut key combination. The buddy concept is also used in Qt's model/view framework.

Linking Labels to Buddy Widgets

To enter buddy editing mode, open the Edit menu and select Edit Buddies. This mode presents the widgets on the form in a similar way to signals and slots editing mode but in this mode, connections must start at label widgets. Ideally, you should connect each label widget that provides a shortcut with a suitable input widget, such as a QLineEdit.

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Removing Buddy Connections

Only one buddy widget can be defined for each label. To change the buddy used, it is necessary to delete any existing buddy connection before you create a new one.

Connections between labels and their buddy widgets can be deleted in the same way as signal-slot connections in signals and slots editing mode: Select the buddy connection by clicking on it and press the Delete key. This operation does not modify either the label or its buddy in any way.

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© 2020 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.