object.sh

# Interface of component
declare -A _global_obj

# $1 - variable name 
# $2 - component class name
# Registers current component in global list, so other components can use this component, without knowing its type
function register_object() {
    if [ -n "${_global_obj["$1"]}" ]; then
        echo "component:[$1] already exists, exiting"
        exit
    fi
    is_function_exists "$2.draw"
    is_function_exists "$2.delete"
    is_function_exists "$2.get_minimal_size"
    is_function_exists "$2.set_style"

    _global_obj["$1"]=$2
}

# $1 - variable name
function unregister_object() {
    unset _global_obj["$1"]
}


# $1 - object name
# Creates new component
function object.new() {
    echo "Called abstract function object.new, exiting"
    exit
}

# $1 - object name
# Deletes components
function object.delete() {
    local comp_class=${_global_obj["$1"]}
    local func="$comp_class.delete"
    $func $1
}

# $1 - object name
# $2 - layout
# Draws components within given layout
function object.draw() {
    local func="${_global_obj["$1"]}.draw"
    $func $1 $2
}

# $1 - object name
# $2 - layout within object will calculate its size
# $3 - variable name for x size
# $4 - variable name for y size
# Calculates minimal size inside given layout 
function object.get_minimal_size() {
    local comp_class=${_global_obj["$1"]}
    local func="$comp_class.get_minimal_size"
    $func $1 $2 $3 $4
}
# $1 - object name
# $2, $3, ... - names of properties to enable, see SYMBOL_MODIFIERS for more style.set_style
# Sets style for object
function object.set_style() {
    local comp_class=${_global_obj["$1"]}
    local func="$comp_class.set_style"
    $func $1 $2
}