QtQuick：在TreeView中更改展开图标

Question

I want to exchange the standard expand icon in a TreeView, is that possible? I guess I would need to define states for the image.

Answer 1

You can provide branchDelegate in TreeViewStyle and use styleData.isExpanded to determine its state. For example,

TreeView {
    style: TreeViewStyle {
        branchDelegate: Rectangle {
            width: 15; height: 15
            color: styleData.isExpanded ? "red" : "green"
        }
    }
    //...
}