Example QListView with custom Delegate

main.go

package main

import (
	"fmt"
	"os"

	"github.com/therecipe/qt/core"
	"github.com/therecipe/qt/gui"
	"github.com/therecipe/qt/widgets"
)

var htmlDelegate *HTMLDelegate

type HTMLDelegate struct {
	widgets.QStyledItemDelegate
}

func InitDelegate(parent core.QObject_ITF) *HTMLDelegate {
	item := NewHTMLDelegate(parent)

	item.ConnectPaint(paint)
	item.ConnectSizeHint(sizeHint)

	return item
}

func paint(painter *gui.QPainter, option *widgets.QStyleOptionViewItem, index *core.QModelIndex) {

	// We only ever see the last index here. i.e. index 3
	fmt.Printf("started painting index %d\n", index.Row())

	options := widgets.NewQStyleOptionViewItem2(option)
	htmlDelegate.InitStyleOption(options, index)

	painter.Save()

	doc := gui.NewQTextDocument(nil)
	text := options.Text()
	doc.SetHtml(text)

	options.SetText("")
	options.Widget().Style().DrawControl(widgets.QStyle__CE_ItemViewItem, options, painter, nil)

	painter.Translate(core.NewQPointF2(options.Rect().TopLeft()))
	clip := core.NewQRectF4(0, 0, float64(options.Rect().Width()), float64(options.Rect().Height()))
	doc.DrawContents(painter, clip)

	painter.Restore()
}

func sizeHint(option *widgets.QStyleOptionViewItem, index *core.QModelIndex) *core.QSize {

	options := widgets.NewQStyleOptionViewItem2(option)
	htmlDelegate.InitStyleOption(options, index)

	var doc gui.QTextDocument
	doc.SetHtml(options.Text())
	doc.SetTextWidth(float64(options.Rect().Width()))

	w := int(doc.IdealWidth())
	h := int(doc.Size().Height())

	return core.NewQSize2(w, h)
}

func main() {
	widgets.NewQApplication(len(os.Args), os.Args)

	list := widgets.NewQListView(nil)
	listModel := core.NewQStringListModel2([]string{"test 1", "test 2", "test 3", "test 4"}, nil)
	list.SetModel(listModel)
	htmlDelegate = InitDelegate(list)
	list.SetItemDelegate(htmlDelegate) // This line shows only last item in the list.
	// list.SetItemDelegate(widgets.NewQStyledItemDelegate(nil)) // This line works properly. as does providing no Delegate.

	var layout = widgets.NewQVBoxLayout()
	layout.AddWidget(list, 0, core.Qt__AlignCenter)

	var window = widgets.NewQMainWindow(nil, 0)
	window.SetWindowTitle("Hello World Example")
	window.SetMinimumSize2(600, 600)
	window.Layout().DestroyQObject()
	window.SetLayout(layout)
	window.Show()

	widgets.QApplication_Exec()
}