How to add List Column to ListView?

[shaoerkuai]

Demo:

func NewMyWindow() *MyWindow {
	wnd := ui.NewWindowMain(
		ui.WindowMainOpts().
			Title("Title").
			ClientArea(win.SIZE{Cx: 340, Cy: 500}),
	)
	icx := win.INITCOMMONCONTROLSEX{
		DwICC: co.ICC_LISTVIEW_CLASSES,
	}
	icx.SetDwSize()
	win.InitCommonControlsEx(&icx)
	me := &MyWindow{
		wnd: wnd,
		lblName: ui.NewStatic(wnd,
			ui.StaticOpts().
				Text("YourName").
				Position(win.POINT{X: 10, Y: 22}),
		),
		txtName: ui.NewEdit(wnd,
			ui.EditOpts().
				Position(win.POINT{X: 80, Y: 20}).
				Size(win.SIZE{Cx: 150}),
		),
		btnShow: ui.NewButton(wnd,
			ui.ButtonOpts().
				Text("&Show").
				Position(win.POINT{X: 240, Y: 19}),
		),
		**table: ui.NewListView(wnd, ui.ListViewOpts().
			Position(win.POINT{
				X: 10,
				Y: 50,
			}).Size(win.SIZE{Cx: 400, Cy: 200}).
			CtrlStyles(co.LVS_REPORT).WndStyles(co.WS_CHILD|co.WS_VISIBLE))**,
	}

	me.btnShow.On().BnClicked(func() {
		msg := fmt.Sprintf("Hello, %s!", me.txtName.Text())
		print(me.wnd.Hwnd().MessageBox(msg, "Saying hello", co.MB_OKCANCEL|co.MB_ICONINFORMATION))
	})
	**dwStyle := me.table.ExtendedStyle()
	dwStyle |= co.LVS_EX_FULLROWSELECT
	dwStyle |= co.LVS_EX_GRIDLINES
	me.table.SetExtendedStyle(true, dwStyle)
	me.table.Columns().Add([]int{20, 5}, "1", "2")
	me.table.Columns().Add([]int{1}, "aaa")**
	return me

I'm using ListView.Add().Columns() but nothing shown:(

And if call me.table.Items().Add("value1", "value2")

A panic occured :panic: LVM_SETITEMTEXT col 1, "value2" failed.

[rodrigocfd]

It panics because the listview doesn't exist yet. Windows will tell you when the controls are ready by sending you a WM_INITDIALOG message, which is when you have your controls.

Since this is a very basic mistake, I suggest you to learn the basics of Win32 API first.

[shaoerkuai]

I just learned the Window Procedure and has made list view worked without panic.

Here is a workaround that might help other users who don't know much about the Win32 API:

1. Register a Notify handler after Window created

notify := myWindow.wnd.On()
make sure that DO PUT IT before RunAsMain(), since RunAsMain will block.

2. Accpet WM_CREATE

	notify.WmCreate(func(p wm.Create) int {
// DO WHAT YOU WANT
		dwStyle := myWindow.table.ExtendedStyle()
		dwStyle |= co.LVS_EX_FULLROWSELECT
		dwStyle |= co.LVS_EX_GRIDLINES
		myWindow.table.SetExtendedStyle(true, dwStyle)
		myWindow.table.Columns().Add([]int{80, 70, 120}, "Col 1", "Col 2", "Col 3")
		return 0
	})

I think I will contribute some basic docs pr to the project once I figure out some things, this is a promising project if someone sticked to windows classic gui programming (I am working on embbed devices testing tools development, and I don't need Qt or Fyne, they areunnecessary).