普通Qt应用程序中的Qt Qml

Question

I have a QListView with a custom ListviewDelegate::paint implemented to do custom painting of items.

I wonder if its possible to crete a qml file defining a rectangle and use that for painting each item? This would give me some freedom to create decent looking items in my listview compared to using the QPainter.

Answer 1

looks like its possible. using following code you can load QML element as QDeclarativeView. Which is derived from QWidget, so you can paint that widget from your deletegate.

 QDeclarativeView *qmlView = new QDeclarativeView;
 qmlView->setSource(QUrl::fromLocalFile("myqml.qml"));

Answer 2

Derive from a QDeclarativeItem and override paint method. Register this new component with qmlRegisterType and use it inside your delegate.

Don't forget to unset flag QGraphicsItem::ItemHasNoContents in your custom component item.

Component code:

class CustomItem : public QDeclarativeItem
{
    Q_OBJECT
    Q_PROPERTY (int radius READ radius WRITE setRadius)
public:
    explicit CustomItem(QDeclarativeItem *parent = 0)
      : QDeclarativeItem(parent), m_radius(0)
    {
        setFlag(QGraphicsItem::ItemHasNoContents, false);
    }
    void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *);
    void setRadius(int r);
    int radius();
private:
    int m_radius;
};

Viewer code (inside main, before setting QML source):

qmlRegisterType<CustomItem>("Self", 1,0, "CustomItem");

And QML code:

import QtQuick 1.1
import Self 1.0
ListView {
    model: ListModel {
        ListElement { name: "One";   value: 10 }
        ListElement { name: "Two";   value: 5 }
        ListElement { name: "Three"; value: 15 }
    }
    delegate: Column {
        Text {
            text: name
        }
        CustomItem {
            radius: value
        }
    }
}