http://blog.csdn.net/yuxiaohen/article/details/17226971
用法很奇葩记录一下，实测可以，用于弱化delegate与持有者的依赖
delegate: Component { Rectangle { id:wrapper
width: parent.width;
height: 30;
BorderImage { id:bg_element
// source: wrapper.isCurrent
anchors.fill:parent;
border.left: 5; border.top: 5
border.right: 5; border.bottom: 5
}
Text { anchors.left: parent.left;
anchors.verticalCenter: parent.verticalCenter;
anchors.leftMargin: parent.width * 0.6;
verticalAlignment: Text.AlignVCenter;
font.family: "SimSun";
text: people_name;
}
MouseArea { anchors.fill: parent;
hoverEnabled: true;
onEntered: { console.log("enter"); bg_element.source = "qrc:/images/images/pointer_hover.png";
}
onExited: { console.log("exit"); bg_element.source = ""
}
onClicked: { console.log("index",index); wrapper.ListView.view.currentIndex = index;
console.log("current index",wrapper.ListView.view.currentIndex); console.log("is current item",wrapper.ListView.isCurrentItem); console.log("model:",wrapper.ListView.view.model); console.log("clicked"); bg_element.source = "qrc:/images/images/pointer_clicked.png";
}
}
}
}
这里涉及到附加属性和属性的概念,访问附加属性时不需要element实体,感觉有点像使用class的static成员,而属性是需要element实体的.
譬如如上代码,delegate是个component,在Rectangle(也就是id为wrapper)这一作用域,才可直接访问ListView的属性(可能附加属性也是如此,没深究)
要访问的isCurrentItem是ListView的附加属性,则 wrapper.ListView.isCurrentItem 即可
要访问的currentIndex是ListView的属性,则 wrapper.ListView.view.currentIndex 才行
