imgui 文本框界面输入中文

Dear user, `imgui` is a lightweight graphical user interface (GUI) library that can be used to create small tool windows within a larger application. For handling text input, such as inputting Chinese characters, `imgui` provides a `InputText` function, which allows users to type text into a text box widget. When you want to input Chinese or any other Unicode characters, you have to ensure that the `imgui` instance is properly set up to handle UTF-8 or UTF-16 encoded strings.

Here's a brief outline of how to set up an `imgui` text box to input Chinese:

1. **Font Support**: Make sure you have included a font with Chinese character support. `imgui` uses the dear ImGui font atlas, and you can either load a font with the correct characters included or generate a font atlas that supports Chinese characters.

2. **Unicode Input**: For Unicode input to work, ensure that the underlying operating system and window message handling are set up to pass Unicode characters to `imgui`.

3. **Input Handling**: In your application, when the `InputText` function is called, it will receive input events, including keyboard events for typing Chinese characters. You may need to use the `ImGuiIO::WantCaptureKeyboard` flag to let `imgui` handle the keyboard input without interference from the host application.

Here is a simple example of how to create a text box using `imgui` that can input Chinese:

if (ImGui::InputText("Chinese Input", &buffer, ImGuiInputTextFlags_CharsDecimal | ImGuiInputTextFlags_AutoSelectAll)) {
    // buffer now holds the text input by the user, including Chinese characters.
}

The `buffer` variable should be a string that `imgui` can modify, which you'll need to manage in your application's data structures. The `ImGuiInputTextFlags_AutoSelectAll` flag automatically selects all text in the input box when focused, making it easier for the user to start typing.