Item

Overview

• Fundamentals
• Examples
• Methods

Fundamentals

The EKG library contains an item collector named ekg::item, the item is a recursive vector collection.

Examples

The item contains the following fields:

• value display-text/tag of item.
• attr the attribute flag defines the rendering, and processing behavior.
• child_list child list to other items.
• component geometry data of item component.

Setting a value to an item is simple:

ekg::item item("animals"); // constructor explicit
ekg::item item {"animals"}; // initialization-list implicit
ekg::item item = {"animals"}; // assign initialization-list implicit

ekg::item item {}; // initialization-list implicit
item.value = "animals"; // accessing the field, but is not too recommendedd

Item contains attr (attributes) flags and state flags, both manually configurable or automatically by setting the value component with special chars.

Special chars:

• \t add automatically the attribute ekg::attr::separator.
• \\ add automatically the attribute ekg::attr::box.
• \1 add automatically the attribute ekg::attr::category.
• \2 add automatically the attribute ekg::attr::row.
• \3 add automatically the attribute ekg::attr::row_member.
• \4 add automatically the attribute ekg::attr::unselectable.

ekg::item item {"Animals"};
item.set_value("\t\\Select All");

// insert a std::vector<std::string> to item.
item.insert({"\\Dogs"});
item.insert({"\\Cats"});
item.insert({"\\Humans"});

You can iterate over the item children using for loop:

ekg::item item("animals");
item.insert({"dogs", "cats", "humans"});

for (ekg::item &items : item) {
    std::cout << items.value << std::endl;
}

Methods

Set value with attributes check, use this instead of setting directly the field.

void set_value(std::string_view _value);

Initialize an item child without generating a copy.

ekg::item &emplace_back();

Insert an item copy in the child list.

void push_back(const ekg::item &item);

Insert an item by setting the value.

void push_back(std::string_view item_value);

Insert a std::vector<ekg::item> child list.

void insert(const std::vector<std::string> &item_value_list);

Get the child item by index position.

ekg::item &at(uint64_t index);

Check if has item children.

bool empty() const;

Get the size of the child list.

uint64_t size() const;

Get begin iterator point.

std::vector<ekg::item>::iterator begin();

Get end iterator point.

std::vector<ekg::item>::iterator end();

Get const begin iterator point.

std::vector<ekg::item>::const_iterator cbegin() const;

Get const end iterator point.

std::vector<ekg::item>::const_iterator cend() const;