我试图在列表框中显示一个对象向量,该向量将在每帧中动态渲染。
这是我的类,我想稍后在列表框中显示每个属性:
class Waypoint {
public:
int x, y, z;
char action;
};
我现在正在尝试的是,因为我真的不知道这一点:
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);
当然,这不起作用,我得到了这个错误:
E0304 no instance of overloaded function "ImGui::ListBox" matches the argument list
如何在列表框中动态显示我的所有对象属性?
ImGui::ListBox
将一个char*
作为显示文本,因此不能使用单个char
。你应该这样重新设计你的课程:
class Waypoint {
public:
int x, y, z;
std::string action;
};
然后使用此功能:
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)
示例:
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()
);