Qt Quick UI Forms

You can use Qt Creator wizards to create UI forms that have the filename extension .ui.qml. The UI forms contain a purely declarative subset of the QML language. It is recommended that you edit the forms in the Design mode. Qt Creator enforces the use of the supported QML features by displaying error messages.

The following features are not supported:

  • JavaScript blocks
  • Function definitions
  • Function calls (except qsTr)
  • Other bindings than pure expressions
  • Signal handlers
  • States in other items than the root item
  • Root items that are not derived from QQuickItem or Item

The following types are not supported:

  • Behavior
  • Binding
  • Canvas
  • Component
  • Shader Effect
  • Timer
  • Transform
  • Transition

Using Qt Quick UI Forms

You can edit the forms in the Design mode. Items that are supposed to be used in QML code have to be exported as properties:

Item {
    width: 640
    height: 480

    property alias button: button

    Button {
        anchors.centerIn: parent
        id: button
        text: qsTr("Press Me")

The property alias exports the button to the QML code that uses the form. You can use the (Export) button in the Navigator to export an item as a property:

In the QML file that uses the form, you can use the button property alias to implement signal handlers, for example. In the following code snippet, the UI form is called MainForm.ui.qml:

MainForm {
    anchors.fill: parent
    button.onClicked: messageDialog.show(qsTr("Button pressed"))

You can also assign properties or define behavior or transitions.

To move from the Design mode directly to the implementation of a type in the .qml file, right-click the type in the Navigator and select Go to Implementation in the context menu.

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