I'm trying to display a vector of objects in a listbox that will be rendered dynamically in every frame.
This is my class and I want to display every attribute later in the listbox:
class Waypoint {
public:
int x, y, z;
char action;
};
What I'm trying now as I don't really know is this:
Waypoint wp1;
wp1.action = 'R';
wp1.x = 100;
wp1.y = 100;
wp1.z = 7;
Waypoint wp2;
wp2.action = 'S';
wp2.x = 100;
wp2.y = 100;
wp2.z = 6;
std::vector<Waypoint> listbox_items { wp1, wp2 };
static int listbox_item_current = 1;
ImGui::ListBox("listbox::Cavebot", &listbox_item_current, listbox_items);
Of course this is not working, and I'm getting this error:
E0304 no instance of overloaded function "ImGui::ListBox" matches the argument list
How can I display dynamically all my objects attributes in the listbox?
CodePudding user response:
ImGui::ListBox
takes a char*
as a displayed text, so you could not use a single char
. You should re-design your class like this:
class Waypoint {
public:
int x, y, z;
std::string action;
};
Then use this function:
bool ImGui::ListBox(const char* label, int* current_item, bool (*items_getter)(void*, int, const char**), void* data, int items_count, int height_in_items)
Example:
bool waypoint_getter(void* data, int index, const char** output)
{
Waypoint* waypoints = (Waypoint*)data;
Waypoint& current_waypoint = waypoints[index];
*output = current_waypoint.action.c_str(); // not very safe
return true;
}
ImGui::ListBox(
"listbox::Cavebot",
&listbox_item_current,
waypoint_getter,
listbox_items.data(),
listbox_items.size()
);