Positioner QML Type

Provides attached properties that contain details on where an item exists in a positioner. 更多...

import 语句：

import QtQuick 2.12

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附加特性

index : int
isFirstItem : bool
isLastItem : bool

详细描述

An object of type Positioner is attached to the top-level child item within a Column, Row, Flow or Grid. It provides properties that allow a child item to determine where it exists within the layout of its parent Column, Row, Flow or Grid.

例如，下文 Grid with 16 child rectangles, as created through a Repeater . Each Rectangle displays its index in the Grid using Positioner.index , and the first item is colored differently by taking Positioner.isFirstItem into account:

Grid {
    Repeater {
        model: 16
        Rectangle {
            id: rect
            width: 30; height: 30
            border.width: 1
            color: Positioner.isFirstItem ? "yellow" : "lightsteelblue"
            Text { text: rect.Positioner.index }
        }
    }
}

附加特性文档编制

Positioner.index : int

This property allows the item to determine its index within the positioner.

Positioner.isFirstItem : bool

These properties allow the item to determine if it is the first or last item in the positioner, respectively.

Positioner.isLastItem : bool

These properties allow the item to determine if it is the first or last item in the positioner, respectively.