studiovc / imfiledialog

A file dialog library for Dear ImGui

ImFileDialog

A simple file dialog library for Dear ImGui.

This library supports favorites, actual Windows icons, image previews, zooming in, etc...

DISCLAIMER: This library was designed and built for use in SHADERed - it uses older version of Dear ImGui so some changes might be required to get it compiled. The way the file filter and the library itself looks was also limited due to me not wanting to break SHADERed's plugins.

Requirements

This library uses C++17's std::filesystem but it also needs these libraries:

• Dear ImGui
• stb_image.h

Usage

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

Here's an example on how to use ImFileDialog:

1. You need to set the CreateTexture and DeleteTexture function

ifd::FileDialog::Instance().CreateTexture = [](uint8_t* data, int w, int h, char 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);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, (fmt == 0) ? GL_BGRA : GL_RGBA, GL_UNSIGNED_BYTE, data);
	glGenerateMipmap(GL_TEXTURE_2D);
	glBindTexture(GL_TEXTURE_2D, 0);

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

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

if (ImGui::Button("Open a texture"))
	ifd::FileDialog::Instance().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::Instance().IsDone("TextureOpenDialog")) {
	if (ifd::FileDialog::Instance().HasResult()) {
		std::string res = ifd::FileDialog::Instance().GetResult().u8string();
		printf("OPEN[%s]\n", res.c_str());
	}
	ifd::FileDialog::Instance().Close();
}

File filter syntax:

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

Running the example

If you want to test ImFileDialog, run these commands:

cmake .
make
./ImFileDialogExample

Screenshots

1. Table view:

2. Icon view:

3. Zooming in:

4. Favorites:

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

TODO

• selecting multiple files
• preview pane / layout options

LICENSE

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