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Hi,

When drawing the GUI with draw() it draws all widgets stored within the GUI. At the moment my code looks like this:

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current_state->render();
gui->render();

Where I have implemented a state machine so that each state has control over the sf::Texts and sf::Sprites being rendered. The issue that I am having is that I am rendering text that needs to go on top of a widget, but since I am rendering the GUI after the text, the widget is being drawn on top of the text preventing you from seeing it. I did get around this in an earlier project by simply creating a second GUI so that I could store the overlapping widgets within the second GUI and render that prior to rendering the text. However I have read in past forum posts that you probably shouldn't be creating multiple instances of tgui::Gui.

So, I am wondering what is the best way to go about controlling when specific widgets are rendered (like how I am controlling the text / sprites being rendered with the state machine) rather than having them all render at the same time. Thanks.

Hi,

I am having trouble understanding how to use std::bind to call a function as part of tgui::SignalWidgetBase::connect(). I was looking at the "Introduction to signals" tutorial for version 0.7 where you show this example (It's probably worth noting that I am using version 0.8.5):

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int getNum() { return 5; }

void func1(int i);
void func2(int value);

picture->connect("clicked", func1, std::bind(getNum));
button->connect("pressed", func2, std::bind(&tgui::Slider::getValue, slider));

My need for std::bind is a bit more complex than this example and this is my first time using std::bind so I have been spending the day learning about std::bind and std::function. This is what my function looks like at the moment:

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void TitleMenuButton::SetFunctions(bool& button_selected, std::string& current_button, std::function<Button&(std::string)> get_button_function) {

button_image->connect("MouseEntered", &TitleMenuButton::ButtonFocused, this, std::ref(button_selected), std::ref(current_button), std::bind(get_button_function, current_button));
button_image->connect("MouseLeft", &TitleMenuButton::ButtonUnfocused, this, std::ref(button_selected), std::ref(current_button));

}

This function belongs to the TitleMenuButton class that stores a tgui::Picture (button_image), the function simply calls connect() on the tgui::Picture and connects the TitleMenuButton::ButtonFocused() and TitleMenuButton::ButtonUnfocused() functions. The issue lies with my attempt at using std::bind to bind the function ButtonList::GetButton().

This function belongs to a ButtonList class that stores x amount of TitleMenuButtons. It is designed to make creating the buttons much faster and easier, so this TitleMenuButton::SetFunctions() function is called from within the ButtonList class as such:

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std::function<Button&(std::string)> get_button_function = std::bind(&ButtonList::GetButton, this, std::placeholders::_1);
button->SetFunctions(is_focusing_button, current_button, get_button_function);

Lastly, the function I am attempting to bind is ButtonList::GetButton() that returns a reference to one of the buttons stored within the ButtonList.

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public:
Button& GetButton(std::string button_name) { return *button_list.at(button_name); }

private:
std::unordered_map<std::string, std::unique_ptr<Button>> button_list;

So the idea behind all of this code is that the ButtonList creates and stores instances of TitleMenuButton and keeps track of which button is currently "active" (Being hovered over with the mouse / keyboard). During the creation process of the TitleMenuButtons we need to connect functions to the various signals to give them functionality. Now on to the actual error I am getting.

Visual Studio seems to like the code and doesn't produce any red squiggly lines, however when I try to compile it I receive 2 errors.

_{'operator __surrogate_func': no matching overloaded function found
Failed to specialize function template 'unknown-type std::Mem_fn<void (__thiscall TitleMenuButton::* )(bool &,std::string &,Button &)>::operator ()(_Types &&...) noexcept(<expr>) const'}

Both of these errors occur in signalimpl.hpp at lines 89 and 88 respectively. Unfortunately both of these error messages are lost on me and I can't figure out what I am doing wrong. I have tried a plethora of methods of passing the function from an instance of ButtonList to an instance of TitleMenuButton but none of them have worked. This seems to be my best attempt so far and I don't think I am that far off from getting it working. However the error messages that point me to TGUI files don't help me much.

If you need to see more of the code then just ask although I hope I have covered everything. Thanks.