不使用 GridView 或 ListView 但使用 c++ 模型的结构化布局的 QML 解决方案

QML solution for a structured layout not using a GridView or ListView but using a c++ model

我正在尝试通过仅使用 RowColumn 来想出一种以非常结构化的方式表示某些项目的方法。我从 Qt Widgets 得到了灵感,在那里你可以用水平和垂直布局做任何事情,并且有一个漂亮的 UI。问题是我仍然希望创建我的 QML 项目的数据来自 c++,这需要某种模型。据我所知,模型只能绑定到 PathViewGridViewListView。此外,该数据将根据 QML UI 发出的一些 "add" 和 "remove" 操作动态变化。有没有办法在模型中使用 RowColumn

让我们假设您的模型应填充 GridRowColumn:

ListModel {
    id: lm
    ListElement { target: "Grid"; content: "green" }
    ListElement { target: "Grid"; content: "blue" }
    ListElement { target: "Grid"; content: "yellow" }
    ListElement { target: "Grid"; content: "orange" }
    ListElement { target: "Row"; content: "green" }
    ListElement { target: "Row"; content: "blue" }
    ListElement { target: "Row"; content: "yellow" }
    ListElement { target: "Row"; content: "orange" }
    ListElement { target: "Column"; content: "green" }
    ListElement { target: "Column"; content: "blue" }
    ListElement { target: "Column"; content: "yellow" }
    ListElement { target: "Column"; content: "orange" }
}

Row {
    id: row
    spacing: 2
    anchors {
        top: parent.top
        left: parent.left
        right: parent.right
    }
}
Column {
    id: column
    spacing: 2
    anchors {
        top: row.bottom; topMargin: 2
        left: parent.left
        bottom: parent.bottom
    }
}
Grid {
    id: grid
    spacing: 2
    columns: 2
    anchors {
        top: row.bottom
        left: column.right
        right: parent.right
        bottom: parent.bottom
        margins: 102
    }
}

您可以像这样使用 Repeater

Repeater {
    model: lm
    delegate:  Rectangle {
        width: 100
        height: 100
        parent: (target === "Grid" ? grid :
                   (target === "Row" ? row :
                      (target === "Column" ? column :
                         null)))
        color: content
    }
}

这可能会给你一个警告:

QQuickItem::stackAfter: Cannot stack after 0x3d5cb18, which must be a sibling

或者您可以使用 Instantiator,这将需要创建一个额外的 QtObject,但您不会收到任何警告。

Instantiator {
    model: lm
    delegate: QtObject {
        property Item child: Rectangle {
        width: 100
        height: 100
        parent: (target === "Grid" ? grid :
                   (target === "Row" ? row :
                      (target === "Column" ? column :
                         null)))
        color: content
    }}
}

您甚至可以为一个模型条目设置多个对象...

Instantiator {
    model: lm
    delegate: QtObject {
        property Item child1: Rectangle {
        width: 100
        height: 100
        parent: (target === "Row" ? row :
                   (target === "Column" ? column :
                      null)) // If "Grid" this thing will be created but not shown.
        color: content
        }

        property Item gridItem: Button {
            width: 100
            height: 30
            text: content
            onClicked: rootWin.color = content
            parent: grid
        }
    }
}