ImFileDialog

Some improvements from dfranx/ImFileDialog based on my own needs, such as

• render item icon follows the system theme
• ask confirmation if file exits in save mode
• replaced the SDL2 with glfw for the example
• upgrade to C++20
• remove the need of GTK-3 on Linux
• better support on Windows, Linux, Macos
• Allow use Gettext for translation, enable with compile flag USE_GETTEXT.

Dependencies

• Dear ImGui
• stb_image.h
• magic_enum

Compile example

Windows

Install dependencies

The example requires OpenGL, GLFW3 and GLEW, on Windows, these could be installed via vcpkg.

Build

1. git submodule init && git submodule update
2. mkdir build && cd build
3. cmake -B . -S .. "-DCMAKE_TOOLCHAIN_FILE=[path to vcpkg]\scripts/buildsystems/vcpkg.cmake"
4. cmake --build .
5. cd Debug
6. ./ImFileDialogExample.exe

Linux

Install dependencies

sudo apt-get install libgl1-mesa-dev libglew-dev libglfw3-dev -y

Build

1. git submodule init && git submodule update
2. mkdir build && cd build
3. cmake ..
4. make -j
5. ./ImFileDialogExample

MacOS

Install dependencies

brew install glew glfw

Build

1. git submodule init && git submodule update
2. mkdir build && cd build
3. cmake ..
4. make -j
5. ./ImFileDialogExample

Usage

To use ImFileDialog in your project, just add ImFileDialog.h, ImFileDialog.cpp and StbImpl.cpp to it.

Please note if you already use stb_image library in your project, just exculde the StbImpl.cpp, otherwise you will have multiple definition of methods from the stb_image library.

According to https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1423r2.html, to make it compile with C++20, the simplest solution to upgrade to c++20 with char8_t, so add /Zc:char8_t- compiler flag to MSVC or -fno-char8_t if you are using Clang/g++.

And also add -ftemplate-depth=2048 compiler flag if you are using clang/g++, this is to constexpr std::array compile.

Here's an example on how to use ImFileDialog:

1. You need to set the CreateTexture and DeleteTexture function

ifd::FileDialog::getInstance().createTexture = [](uint8_t* data, int w, int h, ifd::Format fmt) -> void* {
	GLuint tex;

	glGenTextures(1, &tex);
	glBindTexture(GL_TEXTURE_2D, tex);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	
	if (fmt == ifd::Format::BGRA) {
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_BGRA, GL_UNSIGNED_BYTE, data);
	} else if (fmt == ifd::Format::RGBA) {
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
	} else {
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
	}

	glGenerateMipmap(GL_TEXTURE_2D);
	glBindTexture(GL_TEXTURE_2D, 0);

	return (void*)tex;
};
ifd::FileDialog::getInstance().deleteTexture = [](void* tex) {
	GLuint texID = (GLuint)tex;
	glDeleteTextures(1, &texID);
};

Where ifd::Format is defined as:

enum class Format: char{
	BGRA,
	RGBA,
	RGB
};

2. Open a file dialog on button press (just an example):

if (ImGui::Button("Open a texture"))
	ifd::FileDialog::getInstance().open("TextureOpenDialog", "Open a texture", "Image file (*.png;*.jpg;*.jpeg;*.bmp;*.tga){.png,.jpg,.jpeg,.bmp,.tga},.*");

3. Render and check if done:

if (ifd::FileDialog::getInstance().isDone("TextureOpenDialog")) {
	if (ifd::FileDialog::getInstance().hasResult()) {
		std::string res = ifd::FileDialog::getInstance().getResult().u8string();
		printf("OPEN[%s]\n", res.c_str());
	}
	ifd::FileDialog::getInstance().close();
}

File filter syntax:

Name1 {.ext1,.ext2}, Name2 {.ext3,.ext4},.*

Screenshots

1. Table view:

2. Icon view:

3. Zooming in:

4. Favorites:

5. Image preview + threading (CTRL + scroll):

LICENSE

ImFileDialog is licensed under MIT license. See LICENSE for more details.