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Hello, I have a set of textures and need to display them one by one, like in a photo viewer. I've made some research and found that when I use setTexture(), it actually copies the texture into the internal one (is that correct?). So, is it better to store a set of textures and call setTexture every time, or a collection of Pictures and change them?

If there is an error in the name of a widget and we try to access it, we will get a segmentation fault without any explanation. Sometimes, it can be difficult to determine whether the problem is actually in the naming, e.g.:

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gui.add(picture, "picture");
//...
func(gui.get<...>("picturW")); //(1)

//////////
func(Picture::Ptr pic):
     pic->getRenderer()->setTexture(texture); //(2) We will get a segmentation fault only there!
//And in my case I truly believed that the problem was with the setTexture() function

So, my proposal is to throw an exception like std::out_of_range at the step marked as (1).

Hello, the following line of code gives me a segmentation fault during execution and I don't know why:

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texture.loadFromPixelData(smg.getSize(), smg.getPixelsPtr());
//smg - sf::Image;
//texture - tgui::Texture;
I definitely know that sf::Image is loaded correctly and is not empty.
The call stack:

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tgui::Backend::createTexture() (Unknown:0)
tgui::Texture::loadFromPixelData(tgui::Vector2<unsigned int>, unsigned char const*, tgui::Rect<unsigned int> const&, tgui::Rect<unsigned int> const&, bool) (Unknown:0)
Backend::GetTextureFromClipboard() (Backend.hpp:37)
main() (test.cpp:41)
UPD: I've rebuilt tgui with debug flag and I have the following message from tgui::getBackend():

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TGUI assertion: getBackend() was called while there is no backend
test: /.../LIBS/TGUI-1.2.0/src/Backend/Window/Backend.cpp:77: std::shared_ptr<tgui::Backend> tgui::getBackend(): Assertion `globalBackend != nullptr' failed.
Okay, I've got the idea. I must have some backend (i.e. tgui::Gui), but why?

Hello, I want to change SpinControl value without calling onValueChange(), is it possible?
Let me describe what I intend to do and possibly you will give some idea how to implement this.
I have 2 SpinControl widgets (the width and the height of the picture) which are linked/bound (idk which word is more correct here), so changing one should affect another, e.g. if I double height, the width should also be doubled. Let's call the function which is responsible for that BalanceRatio():

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//Briefly
BalanceRatio()
{
SpindleControl2->setValue(BalancedValue);
}
When I call it inside onValueChange() it creates a recursion and it's quite logical.
Then I've made the next trick (looks ugly but it actually helped):

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SpindleControl1->onValueChange([](){
//Some code here
SpindleControl1->setFocused(0);
});

SpindleControl1->onUnfocus(BalanceRatio);
And it worked pretty nice until I noticed that if I press the arrow continuously, onUnfocus will be never called.
And the question is: how to set the new value without calling onValueChange() to avoid the recursion?
P.S. I'm sorry if there are some grammar mistakes but I feel really fatigued and have neither time nor the desire to use the translator to check my writing    .

[fully]

Hello, I would like to ask if there are any ways to fully fit the picture with the constant w/h-ratio inside the panel (see attachment: the purple border is the panel and the green rectangle is the picture) that are already implemented inside the library, or should I implement such things by myself? The main idea is to fit it dynamically (while the panel is being resized from (w0;h0) to (w1; h1)).

Hello, I want to load the font after creating tgui::Font object, but I looked through the documentation and there are no such functions as loadFromFile() or loadFromMemory(). So I decided to do the following:

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tgui::Font font;
font.getBackendFont()->loadFromFile("font.ttf");
but this leads to a segmentation fault. Are there any ways to do what I intend to do?

Hello, I suppose that I'm missing something but can't figure out what. I have the next class (some realization nuances are omitted):

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class Scene
{
public:
    std::list<tgui::Group::Ptr> groups;
private:
    using iterator = std::list<tgui::Group::Ptr>::iterator;
    iterator current_group;
    void change_scene(iterator &from, iterator &to);

};

In the main function I have something like that:

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scene.groups.emplace_back(tgui::Group::create());

//Some widgets initialization and adding them to the group

gui.add(scene.groups.begin());
It works pretty nice until I close the program (and ~Scene() is called) and get Seg fault message. I've attached the picture from the debugger.

Hello!
What I'm supposed to do: when button was clicked its texture should be changed.
I have textures in one single .png file and my code looks like:

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bool linked = 1;
    tgui::Texture link_t[2];
    for (short i = 0; i < 2; ++i)
        link_t[i].load("lu.png", {unsigned(50 * i), 0, 50, 50});

    auto link_b = gui.get<tgui::Button>("link_b");

    auto lb_func = [&link_b, &linked, &link_t]()
    {
        linked = !linked;
        link_b->getRenderer()->setTexture(link_t[linked]);
    };

    gui.get<tgui::Button>("link_b")->onClick(lb_func);
It's expected the texture to be changed every time I click the button, but actually it changes only once.

So I've written the following code to "separate" textures:

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bool linked = 1;
    tgui::Texture linked_t, unlinked_t;

    linked_t.load("linked.png");
    unlinked_t.load("unlinked.png");

    auto link_b = gui.get<tgui::Button>("link_b");

    if (linked)
        link_b->getRenderer()->setTexture(linked_t);
    else
        link_b->getRenderer()->setTexture(unlinked_t);

    auto lb_func = [&link_b, &linked, &linked_t, &unlinked_t]()
    {
        linked = !linked;
        if (linked)
            link_b->getRenderer()->setTexture(linked_t);
        else
            link_b->getRenderer()->setTexture(unlinked_t);
    };

    gui.get<tgui::Button>("link_b")->onClick(lb_func);And it works pretty good! I think the problem that my first piece of code uses the textures with the same ID. Perhaps, that's the reason why setTexture() doesn't change the texture.

Version: TGUI-1.1.0
OS: Kubuntu-22.04

Hello, I've faced the following problem:
When I call

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spin_control->hideWithEffect(...) none of the effects affects widget somehow.
 
When I call

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spin_control->getRenderer()->setOpacity(0) nothing happens again.

But if I use

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spin_control->getSpinButtonRenderer()->setOpacity(0.5);
spin_control->getSpinTextRenderer()->setOpacity(0.5);it actually works.

Is this bug or am I doing something wrong?