### Gamepad Navigation Setup

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/FAQ.md

Enable gamepad navigation by mapping inputs to io.NavInputs and setting ImGuiConfigFlags_NavEnableGamepad.

```cpp
io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;
```

--------------------------------

### Testing ImGuiKey_KeyPadEnter

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/CHANGELOG.txt

Example of testing for the newly added ImGuiKey_KeyPadEnter key within InputText widgets.

```cpp
InputText: Testing for newly added ImGuiKey_KeyPadEnter key. (#2677, #2005) [@amc522]
```

--------------------------------

### Allocator Functions Setup

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/CHANGELOG.txt

Allocator parameters are no longer passed to CreateContext(). Instead, they are set using SetAllocatorFunctions() and are shared across all contexts.

```cpp
ImGui::SetAllocatorFunctions(my_malloc, my_free);
```

--------------------------------

### Rendering Draw Lists

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/CHANGELOG.txt

The io.RenderDrawListsFn callback is obsolete. Instead, call your graphics engine's render function after ImGui::Render(). For example, use ImDrawData* draw_data = ImGui::GetDrawData(); ImGui_ImplXXXX_RenderDrawData(draw_data);

```cpp
ImGui::Render();
ImDrawData* draw_data = ImGui::GetDrawData();
ImGui_ImplXXXX_RenderDrawData(draw_data);
```

--------------------------------

### Load Default Font

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/FONTS.txt

Loads the default embedded font. This is the simplest way to get started with fonts.

```cpp
ImGuiIO& io = ImGui::GetIO();
io.Fonts->AddFontDefault();
```

--------------------------------

### Creating an ImGui Window with Menu and Widgets

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/README.md

Shows how to create a window with a menu bar, including menu items for actions like open, save, and close. It also demonstrates using a color picker, plotting data, and displaying text within a scrollable child region.

```cpp
// Create a window called "My First Tool", with a menu bar.
ImGui::Begin("My First Tool", &my_tool_active, ImGuiWindowFlags_MenuBar);
if (ImGui::BeginMenuBar())
{
    if (ImGui::BeginMenu("File"))
    {
        if (ImGui::MenuItem("Open..", "Ctrl+O")) { /* Do stuff */ }
        if (ImGui::MenuItem("Save", "Ctrl+S"))   { /* Do stuff */ }
        if (ImGui::MenuItem("Close", "Ctrl+W"))  { my_tool_active = false; }
        ImGui::EndMenu();
    }
    ImGui::EndMenuBar();
}

// Edit a color (stored as ~4 floats)
ImGui::ColorEdit4("Color", my_color);

// Plot some values
const float my_values[] = { 0.2f, 0.1f, 1.0f, 0.5f, 0.9f, 2.2f };
ImGui::PlotLines("Frame Times", my_values, IM_ARRAYSIZE(my_values));

// Display contents in a scrolling region
ImGui::TextColored(ImVec4(1,1,0,1), "Important Stuff");
ImGui::BeginChild("Scrolling");
for (int n = 0; n < 50; n++)
    ImGui::Text("%04d: Some text", n);
ImGui::EndChild();
ImGui::End();
```

--------------------------------

### Renamed Help Menu to Tools

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/CHANGELOG.txt

The 'Help' menu in the demo has been renamed to 'Tools' for better accuracy.

```cpp
Demo: Renamed the "Help" menu to "Tools" (more accurate).
```

--------------------------------

### Get ImGui Module Properties

Source: https://github.com/segross/unrealimgui/blob/master/README.md

Access the properties interface of the ImGui module to modify its behavior. This is typically done through the FImGuiModule instance.

```cpp
FImGuiModule::Get().GetProperties();
```

--------------------------------

### Basic ImGui UI Elements

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/README.md

Demonstrates the usage of common ImGui widgets such as text display, buttons, input fields, and sliders. These are fundamental building blocks for creating user interfaces.

```cp
ImGui::Text("Hello, world %d", 123);
if (ImGui::Button("Save"))
    MySaveFunction();
ImGui::InputText("string", buf, IM_ARRAYSIZE(buf));
ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
```

--------------------------------

### ID Collision Example

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/FAQ.md

Shows a scenario where two buttons with the same label in the same scope cause an ID collision, leading to unintended interactions.

```c
Button("OK");
Button("OK");          // ID collision! Interacting with either button will trigger the first one.
```

--------------------------------

### Using PushID/PopID with Pointers

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/FAQ.md

Shows how to use PushID with object pointers to differentiate UI elements associated with different data instances in a loop.

```c
Begin("Window");
// ... previous loop ...
for (int i = 0; i < 100; i++)
{
  MyObject* obj = Objects[i];
  PushID(obj);
  Button("Click");     // Label = "Click",  ID = hash of ("Window", obj pointer, "Click")
  PopID();
}
// ... other loops ...
```

--------------------------------

### Using PushID/PopID with Integers

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/FAQ.md

Demonstrates how to use PushID with integer values to create unique scopes for programmatically generated UI elements within a loop.

```c
Begin("Window");
for (int i = 0; i < 100; i++)
{
  PushID(i);           // Push i to the id tack
  Button("Click");     // Label = "Click",  ID = hash of ("Window", i, "Click")
  PopID();
}
// ... other loops ...
```

--------------------------------

### Context Management: Create and Destroy Context

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/CHANGELOG.txt

You now need to explicitly create and destroy ImGui contexts. Call ImGui::CreateContext() at the beginning of your application and ImGui::DestroyContext() at the end. This replaces the old Shutdown() function.

```cpp
ImGui::CreateContext();
// ... your app code ...
ImGui::DestroyContext();
```

--------------------------------

### Load Multiple Fonts

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/FONTS.txt

Loads multiple fonts and demonstrates how to switch between them at runtime using PushFont and PopFont.

```cpp
ImGuiIO& io = ImGui::GetIO();
ImFont* font1 = io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels);
ImFont* font2 = io.Fonts->AddFontFromFileTTF("anotherfont.otf", size_pixels);

// Select font at runtime
ImGui::Text("Hello");	// use the default font (which is the first loaded font)
ImGui::PushFont(font2);
ImGui::Text("Hello with another font");
ImGui::PopFont();
```

--------------------------------

### Registering and Using Textures with Unreal ImGui

Source: https://github.com/segross/unrealimgui/blob/master/README.md

Demonstrates how to register, update, release, and find ImGui textures within Unreal Engine. The texture handle can be implicitly converted to ImTextureID for use with ImGui.

```C++
// Texture handle defined like this
FImGuiTextureHandle TextureHandle;

// Registration and update
TextureHandle = FImGuiModule::Get().RegisterTexture("TextureName", Texture);

// Release
FImGuiModule::Get().ReleaseTexture(TextureHandle);

// Find by name
TextureHandle = FImGuiModule::Get().FindTextureHandle("TextureName");

// Example of usage (it is implicitly converted to ImTextureID)
ImGui::Image(TextureHandle, Size);
```

--------------------------------

### Nested PushID Scopes

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/FAQ.md

Demonstrates how to create deeply nested ID scopes using multiple PushID calls to uniquely identify elements within complex UI structures.

```c
Button("Click");       // Label = "Click",  ID = hash of (..., "Click")
PushID("node");
  Button("Click");     // Label = "Click",  ID = hash of (..., "node", "Click")
  PushID(my_ptr);
    Button("Click");   // Label = "Click",  ID = hash of (..., "node", my_ptr, "Click")
  PopID();
PopID();
```

--------------------------------

### Using PushID/PopID with String Pointers

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/FAQ.md

Illustrates using PushID with string pointers (e.g., object names) to create unique IDs for UI elements based on associated string data.

```c
Begin("Window");
// ... previous loops ...
for (int i = 0; i < 100; i++)
{
  MyObject* obj = Objects[i];
  PushID(obj->Name);
  Button("Click");     // Label = "Click",  ID = hash of ("Window", obj->Name, "Click")
  PopID();
}
End();
```

--------------------------------

### Check ImGui Input Capture

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/FAQ.md

Use io.WantCaptureMouse, io.WantCaptureKeyboard, and io.WantTextInput flags to determine if ImGui is handling input. Pass all inputs to ImGui even when flags are false.

```cpp
if (ImGui::GetIO().WantCaptureMouse) {
    // ImGui wants mouse input
}
if (ImGui::GetIO().WantCaptureKeyboard) {
    // ImGui wants keyboard input
}
if (ImGui::GetIO().WantTextInput) {
    // ImGui wants text input (e.g., for on-screen keyboard)
}
```

--------------------------------

### Basic Button Labels

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/FAQ.md

Demonstrates how simple string labels are used to generate unique IDs for buttons.

```c
Button("OK");          // Label = "OK",     ID = hash of (..., "OK")
Button("Cancel");      // Label = "Cancel", ID = hash of (..., "Cancel")
```

--------------------------------

### Disabling Metrics Window

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/CHANGELOG.txt

Illustrates how to compile out the ShowMetricsWindow() function using the IMGUI_DISABLE_METRICS_WINDOW setting in imconfig.h.

```cpp
Misc: Added IMGUI_DISABLE_METRICS_WINDOW imconfig.h setting to explicitly compile out ShowMetricsWindow().
```

--------------------------------

### Stateless Auto-Scrolling in Demo Log

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/CHANGELOG.txt

The demo's Log and Console now use a simpler stateless pattern for auto-scrolling.

```cpp
Demo: Log, Console: Using a simpler stateless pattern for auto-scrolling.
```

--------------------------------

### Enabling Keyboard Navigation

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/CHANGELOG.txt

To enable keyboard navigation, set io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard. NewFrame() will automatically populate io.NavInputs[] based on your io.KeysDown[] and io.KeyMap[] arrays.

```cpp
io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
```

--------------------------------

### Checking for Any Window Focused

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/CHANGELOG.txt

The obsolete IsAnyWindowFocused() function is replaced by IsWindowFocused(ImGuiFocusedFlags_AnyWindow). A redirection function is kept but will be obsoleted.

```cpp
if (ImGui::IsWindowFocused(ImGuiFocusedFlags_AnyWindow)) {
    // ...
}
```

--------------------------------

### Auto-Scrolling with Stateless Pattern

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/CHANGELOG.txt

Demonstrates a simpler stateless pattern for auto-scrolling by checking if the current scroll position is at the maximum and then setting the scroll to make the last item visible.

```cpp
// (Submit items..)
if (ImGui::GetScrollY() >= ImGui::GetScrollMaxY())  // If scrolling at the already at the bottom..
    ImGui::SetScrollHereY(1.0f);                    // ..make last item fully visible
```

--------------------------------

### Enabling Gamepad Navigation

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/CHANGELOG.txt

To enable gamepad navigation, set io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad. You also need to set io.BackendFlags |= ImGuiBackendFlags_HasGamepad and fill the io.NavInputs[] fields before calling NewFrame().

```cpp
io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;
io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
// Fill io.NavInputs[] here
```

--------------------------------

### Add ImGui as a Public Dependency

Source: https://github.com/segross/unrealimgui/blob/master/README.md

Include the ImGui module as a public dependency in your module's Build.cs file. Use this if other modules need to directly access ImGui functionalities.

```csharp
PublicDependencyModuleNames.Add("ImGui");
```

--------------------------------

### Building Font Atlas and Retrieving Texture Data

Source: https://github.com/segross/unrealimgui/blob/master/Source/ThirdParty/ImGuiLibrary/Docs/FONTS.txt

Builds the font atlas, making fonts ready for use, and retrieves the font texture data in RGBA format for potential modification.

```cpp
// Build atlas
io.Fonts->Build();

// Retrieve texture in RGBA format
unsigned char* tex_pixels = NULL;
int tex_width, tex_height;
io.Fonts->GetTexDataAsRGBA32(&tex_pixels, &tex_width, &tex_height);
```