DelegateChooser QML 类型

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import 语句：

import Qt.labs.qmlmodels

• 所有成员列表，包括继承成员

特性

• choices : list<DelegateChoice>
• role : string

详细描述

The DelegateChooser is a special Component type intended for those scenarios where a Component is required by a view and used as a delegate. DelegateChooser encapsulates a set of DelegateChoice s. These choices are used to determine the delegate that will be instantiated for each item in the model. The selection of the choice is performed based on the value that a model item has for role , and also based on index.

DelegateChooser is commonly used when a view needs to display a set of delegates that are significantly different from each other. For example, a typical phone settings view might include toggle switches, sliders, radio buttons, and other visualizations based on the type of each setting. In this case, DelegateChooser could provide an easy way to associate a different type of delegate with each setting:

import QtQuick
import QtQuick.Controls
import Qt.labs.qmlmodels
ListView {
    width: 200; height: 400
    ListModel {
        id: listModel
        ListElement { type: "info"; ... }
        ListElement { type: "switch"; ... }
        ListElement { type: "swipe"; ... }
        ListElement { type: "switch"; ... }
    }
    DelegateChooser {
        id: chooser
        role: "type"
        DelegateChoice { roleValue: "info"; ItemDelegate { ... } }
        DelegateChoice { roleValue: "switch"; SwitchDelegate { ... } }
        DelegateChoice { roleValue: "swipe"; SwipeDelegate { ... } }
    }
    model: listModel
    delegate: chooser
}
					

注意： This type is intended to transparently work only with TableView and any DelegateModel -based view. Views (including user-defined views) that aren't internally based on a DelegateModel need to explicitly support this type of component to make it function as described.

另请参阅 DelegateChoice .

特性文档编制

choices : list < DelegateChoice > [default]

The list of DelegateChoices for the chooser.

The list is treated as an ordered list, where the first DelegateChoice to match will be used be a view.

It should not generally be necessary to refer to the choices property, as it is the default property for DelegateChooser and thus all child items are automatically assigned to this property.

role : string

This property holds the role or the property name used to determine the delegate for a given model item.

注意： For QAbstractItemModel based models, including ListModel ， DelegateChooser will reevaluate the choice when the model signals that the role has changed. For any other type of model, this choice will only be done once when the item for a given model index is created.

另请参阅 DelegateChoice .

内容

• 特性

• 详细描述