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List DisallowEmpty (windows).

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This commit is contained in:
Nuno Cruces 2022-12-05 13:24:58 +00:00
parent 589e1b5b01
commit c99e4fac4e
3 changed files with 27 additions and 8 deletions
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1
internal/win/user32.go
View file

@ -142,6 +142,7 @@ const (
ES_AUTOHSCROLL = 0x0080
// List box control styles
LBS_NOTIFY = 0x0001
LBS_EXTENDEDSEL = 0x0800
// Month calendar control styles

2
list.go
View file

@ -57,7 +57,7 @@ func DefaultItems(items ...string) Option {
return funcOption(func(o *options) { o.defaultItems = items })
}
// DisallowEmpty returns an Option to not allow zero items to be selected (macOS only).
// DisallowEmpty returns an Option to not allow zero items to be selected (Windows and macOS only).
func DisallowEmpty() Option {
return funcOption(func(o *options) { o.disallowEmpty = true })
}

32
list_windows.go
View file

@ -31,17 +31,19 @@ func listDlg(text string, items []string, multiple bool, opts options) ([]string
}
dlg := &listDialog{
items: items,
multiple: multiple,
items: items,
multiple: multiple,
disallowEmpty: opts.disallowEmpty,
}
return dlg.setup(text, opts)
}
type listDialog struct {
items []string
multiple bool
out []string
err error
items []string
multiple bool
disallowEmpty bool
out []string
err error
wnd win.HWND
textCtl win.HWND
@ -84,7 +86,7 @@ func (dlg *listDialog) setup(text string, opts options) ([]string, error) {
strptr("STATIC"), strptr(text), _WS_ZEN_LABEL,
12, 10, 241, 16, dlg.wnd, 0, instance, nil)
var flags uint32 = _WS_ZEN_CONTROL | win.WS_VSCROLL
var flags uint32 = _WS_ZEN_CONTROL | win.WS_VSCROLL | win.LBS_NOTIFY
if dlg.multiple {
flags |= win.LBS_EXTENDEDSEL
}
@ -120,6 +122,7 @@ func (dlg *listDialog) setup(text string, opts options) ([]string, error) {
}
}
dlg.update()
dlg.layout(getDPI(dlg.wnd))
centerWindow(dlg.wnd)
win.SetFocus(dlg.listCtl)
@ -166,6 +169,20 @@ func (dlg *listDialog) layout(dpi dpi) {
}
}
func (dlg *listDialog) update() {
if dlg.disallowEmpty {
var enable bool
if dlg.multiple {
len := win.SendMessage(dlg.listCtl, win.LB_GETSELCOUNT, 0, 0)
enable = int32(len) > 0
} else {
idx := win.SendMessage(dlg.listCtl, win.LB_GETCURSEL, 0, 0)
enable = int32(idx) >= 0
}
win.EnableWindow(dlg.okBtn, enable)
}
}
func listProc(wnd win.HWND, msg uint32, wparam uintptr, lparam *unsafe.Pointer) uintptr {
var dlg *listDialog
switch msg {
@ -189,6 +206,7 @@ func listProc(wnd win.HWND, msg uint32, wparam uintptr, lparam *unsafe.Pointer)
case win.WM_COMMAND:
switch wparam {
default:
dlg.update()
return 1
case win.IDOK, win.IDYES:
if dlg.multiple {