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/*!
    \page qtquickcontrols2-customize.html
    \title Customizing Qt Quick Controls 2
    \brief A set of UI controls to create user interfaces in Qt Quick

    Qt Quick Controls 2 consist of a hierarchy (tree) of items. In order to
    provide a custom look and feel, the default QML implementation of each
    item can be replaced with a custom one. The following snippets present
    the default implementations of various items. These can be used as a
    starting point to implement a custom look and feel.

    \section1 Customizing BusyIndicator

        BusyIndicator consists of two visual items: \l {Control::background}{background}
        and \l {Control::contentItem}{contentItem}.

        \section3 Background

            \image qtquickcontrols-busyindicator-background.png

            BusyIndicator has no background item by default.

        \section3 Content item

            \image qtquickcontrols-busyindicator-contentItem.png

            \snippet BusyIndicator.qml contentItem


    \section1 Customizing Button

        Button consists of two visual items: \l {Control::background}{background}
        and \l {Control::contentItem}{content item}.

        \section3 Background

            \image qtquickcontrols-button-background.png

            \snippet Button.qml background

        \section3 Content item

            \image qtquickcontrols-button-contentItem.png

            \snippet Button.qml contentItem


    \section1 Customizing CheckBox

        CheckBox consists of three visual items: \l {Control::background}{background},
        \l {Control::contentItem}{contentItem} and \l {AbstractButton::indicator}{indicator}.

        \section3 Background

            \image qtquickcontrols-checkbox-background.png

            CheckBox has no background item by default.

        \section3 Content item

            \image qtquickcontrols-checkbox-contentItem.png

            \snippet CheckBox.qml contentItem

        \section3 Indicator

            \image qtquickcontrols-checkbox-indicator.png

            \snippet CheckBox.qml indicator


    \section1 Customizing CheckDelegate

        CheckDelegate consists of three visual items: \l {Control::background}{background},
        \l {Control::contentItem}{contentItem} and \l {AbstractButton::indicator}{indicator}.

        \section3 Background

            \image qtquickcontrols-checkdelegate-background.png

            \snippet CheckDelegate.qml background

        \section3 Content item

            \image qtquickcontrols-checkdelegate-contentItem.png

            \snippet CheckDelegate.qml contentItem

        \section3 Indicator

            \image qtquickcontrols-checkdelegate-indicator.png

            \snippet CheckDelegate.qml indicator


    \section1 Customizing ComboBox

        ComboBox consists of \l {Control::background}{background},
        \l {Control::contentItem}{content item}, \l {ComboBox::popup}{popup},
        and \l {ComboBox::delegate}{delegate}.

        \section3 Background

            \image qtquickcontrols-combobox-background.png

            \snippet ComboBox.qml background

        \section3 Content item

            \image qtquickcontrols-combobox-contentItem.png

            \snippet ComboBox.qml contentItem

        \section3 Popup

            \image qtquickcontrols-combobox-popup.png

            \snippet ComboBox.qml popup

        \section3 Delegate

            \image qtquickcontrols-combobox-delegate.png

            \snippet ComboBox.qml delegate


    \section1 Customizing Dial

        Dial consists of two visual items: \l {Control::background}{background}
        and \l {Dial::handle}{handle}.

        \section3 Background

            \image qtquickcontrols-dial-background.png

            \snippet Dial.qml background

        \section3 Indicator

            \image qtquickcontrols-dial-handle.png

            \snippet Dial.qml handle


    \section1 Customizing Drawer

        Drawer can have a visual \l {Control::background}{background}
        item.

        \section3 Background

            \snippet Drawer.qml background


    \section1 Customizing Frame

        Frame consists of one visual item: \l {Control::background}{background}.

        \section3 Background

            \image qtquickcontrols-frame-background.png

            \snippet Frame.qml background


    \section1 Customizing GroupBox

        GroupBox consists of two visual items: \l {Control::background}{background}
        and \l {GroupBox::label}{label}.

        \section3 Background

            \image qtquickcontrols-groupbox-background.png

            \snippet GroupBox.qml background

        \section3 Label

            \image qtquickcontrols-groupbox-label.png

            \snippet GroupBox.qml label


    \section1 Customizing ItemDelegate

        ItemDelegate consists of three visual items: \l {Control::background}{background},
        \l {Control::contentItem}{content item} and \l {AbstractButton::indicator}{indicator}.
        The indicator is only visible for \l {AbstractButton::checkable}{checkable} items.

        \section3 Background

            \image qtquickcontrols-itemdelegate-background.png

            \snippet ItemDelegate.qml background

        \section3 Content item

            \image qtquickcontrols-itemdelegate-contentItem.png

            \snippet ItemDelegate.qml contentItem

        \section3 Indicator

            \image qtquickcontrols-itemdelegate-indicator.png

            \snippet ItemDelegate.qml indicator


    \section1 Customizing Label

        Label can have a visual \l {Label::background}{background} item.

        \section3 Background

            \image qtquickcontrols-label-background.png

            Label has no background item by default.


    \section1 Customizing Menu

        Menu consists of a \l {Popup::}{contentItem}.

        \section3 Content item

            \image qtquickcontrols-menu-contentItem.png

            \snippet Menu.qml contentItem


    \section1 Customizing MenuItem

        MenuItem can be customized in the same manner as
        \l {Customizing Button}{Button}.


    \section1 Customizing PageIndicator

        PageIndicator consists of a \l {Control::background}{background}, \l {Control::contentItem}{content item}, and \l {PageIndicator::delegate}{delegate}.

        \section3 Background

            \image qtquickcontrols-pageindicator-background.png

        PageIndicator has no background item by default.

        \section3 Content item

            \image qtquickcontrols-pageindicator-contentItem.png

            \snippet PageIndicator.qml contentItem

        \section3 Delegate

            \image qtquickcontrols-pageindicator-delegate.png

            \snippet PageIndicator.qml delegate



    \section1 Customizing Pane

        Pane consists of a \l {Control::background}{background}.

        \section3 Background

            \image qtquickcontrols-pane-background.png

            \snippet Pane.qml background


    \section1 Customizing ProgressBar

        ProgressBar consists of two visual items: \l {Control::background}{background}
        and \l {Control::contentItem}{content item}.

        \section3 Background

            \image qtquickcontrols-progressbar-background.png

            \snippet ProgressBar.qml background

        \section3 Content item

            \image qtquickcontrols-progressbar-contentItem.png

            \snippet ProgressBar.qml contentItem


    \section1 Customizing RadioButton

        RadioButton consists of three visual items: \l {Control::background}{background},
        \l {Control::contentItem}{content item} and \l {AbstractButton::indicator}{indicator}.

        \section3 Background

            \image qtquickcontrols-radiobutton-background.png

            RadioButton has no background item by default.

        \section3 Content item

            \image qtquickcontrols-radiobutton-contentItem.png

            \snippet RadioButton.qml contentItem

        \section3 Indicator

            \image qtquickcontrols-radiobutton-indicator.png

            \snippet RadioButton.qml indicator


    \section1 Customizing RangeSlider

        RangeSlider consists of three visual items:
        \l {Control::background}{background},
        \l {RangeSlider::first}{first.handle} and
        \l {RangeSlider::second.handle}{second.handle}.

        \section3 Background

            \image qtquickcontrols-rangeslider-background.png

            \snippet RangeSlider.qml background

        \section3 First Handle

            \image qtquickcontrols-rangeslider-first-handle.png

            \snippet RangeSlider.qml firstHandle

        \section3 Second Handle

            \image qtquickcontrols-rangeslider-second-handle.png

            \snippet RangeSlider.qml secondHandle


    \section1 Customizing ScrollBar

        ScrollBar consists of two visual items: \l {Control::background}{background}
        and \l {Control::contentItem}{content item}.

        \section3 Background

            \image qtquickcontrols-scrollbar-background.png

            ScrollBar has no background item by default.

        \section3 Content item

            \image qtquickcontrols-scrollbar-contentItem.png

            \snippet ScrollBar.qml contentItem


    \section1 Customizing ScrollIndicator

        ScrollIndicator consists of two visual items: \l {Control::background}{background}
        and \l {Control::contentItem}{content item}.

        \section3 Background

            \image qtquickcontrols-scrollindicator-background.png

            ScrollIndicator has no background item by default.

        \section3 Content item

            \image qtquickcontrols-scrollindicator-contentItem.png

            \snippet ScrollIndicator.qml contentItem


    \section1 Customizing Slider

        Slider consists of two visual items: \l {Control::background}{background},
        and \l {Slider::handle}{handle}.

        \section3 Background

            \image qtquickcontrols-slider-background.png

            \snippet Slider.qml background

        \section3 Handle

            \image qtquickcontrols-slider-handle.png

            \snippet Slider.qml handle


    \section1 Customizing SpinBox

        SpinBox consists of four visual items: \l {Control::background}{background},
        \l {Control::contentItem}{contentItem}, \l {SpinBox::up.indicator}{up indicator},
        and \l {SpinBox::down.indicator}{down indicator}.

        \section3 Background

            \image qtquickcontrols-spinbox-background.png

            \snippet SpinBox.qml background

        \section3 Content item

            \image qtquickcontrols-spinbox-contentItem.png

            \snippet SpinBox.qml contentItem

        \section3 Down indicator

            \image qtquickcontrols-spinbox-down.png

            \snippet SpinBox.qml down.indicator

        \section3 Up indicator

            \image qtquickcontrols-spinbox-up.png

            \snippet SpinBox.qml up.indicator


    \section1 Customizing StackView

        StackView can have a visual \l {Control::background}{background}
        item, and it allows customizing the transitions that are used for
        push, pop, and replace operations.

        \section3 Push enter

            \snippet StackView.qml pushEnter

        \section3 Push exit

            \snippet StackView.qml pushExit

        \section3 Pop enter

            \snippet StackView.qml popEnter

        \section3 Pop exit

            \snippet StackView.qml popExit

        \section3 Replace enter

            \snippet StackView.qml replaceEnter

        \section3 Replace exit

            \snippet StackView.qml replaceExit

    \section1 Customizing SwipeDelegate

        SwipeDelegate consists of four visual items: \l {Control::background}{background},
        \l {Control::contentItem}{content item}, \c exposure.left, and \c exposure.right.

        \section3 Background

            \image qtquickcontrols-swipedelegate-background.png

            \snippet SwipeDelegate.qml background

        \section3 Content item

            \image qtquickcontrols-swipedelegate-contentItem.png

            \snippet SwipeDelegate.qml contentItem

        \section3 Left, right, and behind

            \image qtquickcontrols-swipedelegate.gif

            By default, there are no left, right, or behind items defined.

    \section1 Customizing SwipeView

        SwipeView can have a visual \l {Control::background}{background}
        item. The navigation is implemented by the \l {Control::contentItem}
        {content item}.

        \section3 Background

        SwipeView has no background item by default.

        \section3 Content item

        \snippet SwipeView.qml contentItem

    \section1 Customizing Switch

        Switch consists of three visual items: \l {Control::background}{background},
        \l {Control::contentItem}{content item} and \l {AbstractButton::indicator}{indicator}.

        \section3 Background

            \image qtquickcontrols-switch-background.png

            Switch has no background item by default.

        \section3 Content item

            \image qtquickcontrols-switch-contentItem.png

            \snippet Switch.qml contentItem

        \section3 Indicator

            \image qtquickcontrols-switch-indicator.png

            \snippet Switch.qml indicator


    \section1 Customizing TabBar

        TODO


    \section1 Customizing TabButton

        TODO


    \section1 Customizing TextArea

        TODO


    \section1 Customizing TextField

        TextField offers a customizable \l {TextField::background}{background} item.

        \section3 Background

            \image qtquickcontrols-textfield-background.png

            \snippet TextField.qml background


    \section1 Customizing ToolBar

        ToolBar consists of one visual item: \l {Control::background}{background}.

        \section3 Background

            \image qtquickcontrols-toolbar-background.png

            \snippet ToolBar.qml background


    \section1 Customizing ToolButton

        ToolButton consists of two visual items: \l {Control::background}{background}
        and \l {Control::contentItem}{content item}.

        \section3 Background

            \image qtquickcontrols-toolbutton-background.png

            \snippet ToolButton.qml background

        \section3 Content item

            \image qtquickcontrols-toolbutton-contentItem.png

            \snippet ToolButton.qml contentItem


    \section1 Customizing ToolTip

        ToolTip consists of two visual items: \l {Popup::background}{background}
        and \l {Popup::contentItem}{content item}.

        \section3 Background

            \image qtquickcontrols-tooltip-background.png

            \snippet ToolTip.qml background

        \section3 Content item

            \image qtquickcontrols-tooltip-contentItem.png

            \snippet ToolTip.qml contentItem


    \section1 Customizing Tumbler

        Tumbler consists of three visual items:
        \l {Control::background}{background},
        \l {Control::contentItem}{contentItem}, and
        \l {Tumbler::delegate}{delegate}.

        \section3 Background

            \image qtquickcontrols-tumbler-background.png

            Tumbler has no background item by default.

        \section3 Content Item

            \image qtquickcontrols-tumbler-contentItem.png

            \snippet Tumbler.qml contentItem

        \section3 Delegate

            \image qtquickcontrols-tumbler-delegate.png

            \snippet Tumbler.qml delegate
*/