Imgui: make ImGui window dynamically fit glfw window

[ilAYAli]

Hi,

Is it possible to make ImGui windows fit e.g the "glfwCreateWindow", and adjust accordingly when the latter window is resized?

Regards,

p.

[ocornut]

Call SetNextWindowPos() and SetNextWindowSize() every frame before creating your imgui window.

On 6 Dec 2016, at 07:35, Petter Wahlman [e-mail] wrote:

Hi,

Is it possible to make ImGui windows fit e.g the "glfwCreateWindow", and adjust accordingly when the latter window is resized?

Regards,

p.

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[ilAYAli]

Wow, quick response!

Very impressive, thank you!

[ilAYAli]

I am still unsure what values to put in SetNextWindowSize(), as GetWindowWidth et al. does not seem to reflect the GL window width (and does not change when I resize this window).

[ocornut]

ImGui::GetWindowWidth() retrieve the width of the current ImGui window that was Begin-ed into.

Retrieving your GL window size is out of the scope of ImGui. See your glfw documentation.

[ilAYAli]

Agreed. This is not directly related to ImGui.
If someone else needs this functionality, here is how I was able to get the C-style glfw callback to trigger my member function (and resize accordingly with ImGui::SetNextWindowSize.)

gui::init() {
    ....
    glfwSetWindowUserPointer(window_, this);
    glfwSetWindowSizeCallback(window_, resize_callback);
    ....
}

void resize_callback(GLFWwindow * window, int width, int height)
{
    auto g = static_cast<gui *>(glfwGetWindowUserPointer(window));
    g->window_resize(width, height);
}