Qt-based BB10 API Examples Documentation


File Picker Example



The File Picker example lets the user configure the properties of a file dialog and open it to select a file for loading or saving.


In this example we'll learn how to use the FilePicker class of the BB10 framework to select a file from the file system. The FilePicker can be configured to either select a file for loading data or to save them. Additionally you can define the view mode, the sort order and criterion of the files and a filter based on mime type or extensions.

The UI

The UI of this sample application consists of a couple of DropDown control to configure the various properties of the FilePicker. A 'Show' button let the use open the dialog and a Label at the bottom of the page shows the selected file path.

The DropDown controls are filled with Option objects that represent the possible values for a property. The enums are directly set on their 'value' property, so that the 'selectedValue' property of the DropDown can be used later on.

    // The file picker mode selector
    DropDown {
        id: pickerMode

        horizontalAlignment: HorizontalAlignment.Center
        topMargin: 50

        title: qsTr("Mode")

        Option {
            text: qsTr("Picker")
            value: FilePickerMode.Picker
            selected: true

        Option {
            text: qsTr("Saver")
            value: FilePickerMode.Saver

        Option {
            text: qsTr("PickerMultiple")
            value: FilePickerMode.PickerMultiple

        Option {
            text: qsTr("SaverMultiple")
            value: FilePickerMode.SaverMultiple

Whenever the user clicks the 'Show' button, the open() method is invoked on the FilePicker object.

    // The 'Show' button
    Button {
        horizontalAlignment: HorizontalAlignment.Center
        topMargin: 100

        text: qsTr("Show")
        onClicked: picker.open()

The object itself is created as attached object on the main page. Its properties are bound against the 'selectedValue' properties of the various DropDown controls, so whenever the user changes an option, the FilePicker is updated automatically.

    attachedObjects: [
        FilePicker {
            id: picker

            property string selectedFile

            title: qsTr ("File Picker")
            mode: pickerMode.selectedValue
            type: pickerType.selectedValue
            viewMode: pickerViewMode.selectedValue
            sortBy: pickerSortBy.selectedValue
            sortOrder: pickerSortOrder.selectedValue

            onFileSelected: {
                selectedFile = selectedFiles[0]

If the user has selected a file in the FilePicker, the onFileSelected() signal handler is invoked. Inside this method we store the first of the selected files in the custom property 'selectedFile'.

    // The result label
    Label {
        id: resultLabel

        horizontalAlignment: HorizontalAlignment.Center
        topMargin: 30

        text: qsTr("Selected file: %1").arg(picker.selectedFile)

        textStyle {
            base: SystemDefaults.TextStyles.BodyText
            color: Color.White

        multiline: true
        visible: (picker.selectedFile != "")

This property is used by the result label to update its 'text' property.