Method setText

tooltip.go:222–246

(hwnd win.HWND, text string)

}

func (tt *ToolTip) setText(hwnd win.HWND, text string) error {
	ti := tt.toolInfo(hwnd)
	if ti == nil {
		return newError("unknown tool")
	}

	n := 0
	for i, r := range text {
		if r < 0x10000 {
			n++
		} else {
			n += 2 // surrogate pair
		}
		if n >= maxToolTipTextLen {
			text = text[:i]
			break
		}
	}

	ti.LpszText = syscall.StringToUTF16Ptr(text)

	tt.SendMessage(win.TTM_SETTOOLINFO, 0, uintptr(unsafe.Pointer(ti)))

	return nil
}

func (tt *ToolTip) toolInfo(hwnd win.HWND) *win.TOOLINFO {
	var ti win.TOOLINFO