ImGuiFileDialog

Purpose

ImGuiFileDialog is a file selection dialog built for (and using only) Dear ImGui.

My primary goal was to have a custom pane with widgets according to file extension. This was not possible using other solutions.

ImGui Supported Version

ImGuiFileDialog follow the master and docking branch of ImGui . currently ImGui 1.89.7

Structure

• The library is in Master branch
• A demo app can be found in the DemoApp branch

This library is designed to be dropped into your source code rather than compiled separately.

From your project directory:

mkdir lib    <or 3rdparty, or externals, etc.>
cd lib
git clone https://github.com/aiekick/ImGuiFileDialog.git
git checkout master

These commands create a lib directory where you can store any third-party dependencies used in your project, downloads the ImGuiFileDialog git repository and checks out the Lib_Only branch where the actual library code is located.

Add lib/ImGuiFileDialog/ImGuiFileDialog.cpp to your build system and include lib/ImGuiFileDialog/ImGuiFileDialog.h in your source code. ImGuiFileLib will compile with and be included directly in your executable file.

If, for example, your project uses cmake, look for a line like add_executable(my_project_name main.cpp) and change it to add_executable(my_project_name lib/ImGuiFileDialog/ImGuiFileDialog.cpp main.cpp). This tells the compiler where to find the source code declared in ImGuiFileDialog.h which you included in your own source code.

Requirements:

You must also, of course, have added Dear ImGui to your project for this to work at all.

dirent v1.23 is required to use ImGuiFileDialog under Windows. It is included in the Lib_Only branch for your convenience.

Android Requirements : Api 21 mini

Features

• C Api (succesfully tested with CimGui)
• Separate system for call and display
  • Can have many function calls with different parameters for one display function, for example
• Can create a custom pane with any widgets via function binding
  • This pane can block the validation of the dialog
  • Can also display different things according to current filter and UserDatas
• Advanced file style for file/dir/link coloring / icons / font
  • predefined form or user custom form by lambda function (the lambda mode is not available for the C API)
• Multi-selection (ctrl/shift + click) :
  • 0 => Infinite
  • 1 => One file (default)
  • n => n files
• Compatible with MacOs, Linux, Windows
  • Windows version can list drives
• Supports modal or standard dialog types
• Select files or directories
• Filter groups and custom filter names
• can ignore filter Case for file searching
• Keyboard navigation (arrows, backspace, enter)
• Exploring by entering characters (case insensitive)
• Directory bookmarks
• Directory manual entry (right click on any path element)
• Optional 'Confirm to Overwrite" dialog if file exists
• Thumbnails Display (agnostic way for compatibility with any backend, sucessfully tested with OpenGl and Vulkan)
• The dialog can be embedded in another user frame than the standard or modal dialog
• Can tune validation buttons (placements, widths, inversion)
• Can quick select a parrallel directory of a path, in the path composer (when you clikc on a / you have a popup)
• regex support for filters, collection of filters and filestyle (the regex is recognized when between (( and )) in a filter)
• multi layer extentions like : .a.b.c .json.cpp .vcxproj.filters etc..
• advanced behavior regarding asterisk based filter. like : .* .. .vcx.* ..filters .vcs.filt.* etc.. (internally regex is used)
• result modes GetFilePathName, GetFileName and GetSelection (overwrite file ext, keep file, add ext if no user ext exist)

WARNINGS :

• the nav system keyboard behavior is not working as expected, so maybe full of bug for ImGuiFileDialog

Filter format

A filter is recognized only if it respects theses rules :

0. a filter must have 2 chars mini and the first must be a .
1. a regex must be in (( and ))
2. a , will separate filters except if between a ( and )
3. name{filter1, filter2} is a special form for collection filters 3.1) the name can be composed of what you want except { and } 3.2) a filter can be a regex
4. the filters cannot integrate these chars '(' ')' '{' '}' ' ' except for a regex with respect to rule 1)
5. the filters cannot integrate a ','

Singleton Pattern vs. Multiple Instances :

Single Dialog :

If you only need to display one file dialog at a time, use ImGuiFileDialog's singleton pattern to avoid explicitly declaring an object:

ImGuiFileDialog::Instance()->method_of_your_choice();

Multiple Dialogs :

If you need to have multiple file dialogs open at once, declare each dialog explicity:

ImGuiFileDialog instance_a;
instance_a.method_of_your_choice();
ImGuiFileDialog instance_b;
instance_b.method_of_your_choice();

Simple Dialog :

void drawGui()
{ 
  // open Dialog Simple
  if (ImGui::Button("Open File Dialog"))
    ImGuiFileDialog::Instance()->OpenDialog("ChooseFileDlgKey", "Choose File", ".cpp,.h,.hpp", ".");

  // display
  if (ImGuiFileDialog::Instance()->Display("ChooseFileDlgKey")) 
  {
    // action if OK
    if (ImGuiFileDialog::Instance()->IsOk())
    {
      std::string filePathName = ImGuiFileDialog::Instance()->GetFilePathName();
      std::string filePath = ImGuiFileDialog::Instance()->GetCurrentPath();
      // action
    }
    
    // close
    ImGuiFileDialog::Instance()->Close();
  }
}

Modal Dialog :

you have now a flag for open modal dialog :

ImGuiFileDialogFlags_Modal

you can use it like that :

ImGuiFileDialog::Instance()->OpenDialog("ChooseFileDlgKey", "Choose File", ".cpp,.h,.hpp", 
	".", 1, nullptr, ImGuiFileDialogFlags_Modal);

Directory Chooser :

To have a directory chooser, set the file extension filter to nullptr:

ImGuiFileDialog::Instance()->OpenDialog("ChooseDirDlgKey", "Choose a Directory", nullptr, ".");

In this mode you can select any directory with one click and open a directory with a double-click.

Dialog with Custom Pane :

The signature of the custom pane callback is:

for C++ :

void(const char *vFilter, IGFDUserDatas vUserDatas, bool *vCantContinue)

for C :

void(const char *vFilter, void* vUserDatas, bool *vCantContinue)

Example :

static bool canValidateDialog = false;
inline void InfosPane(cosnt char *vFilter, IGFDUserDatas vUserDatas, bool *vCantContinue) // if vCantContinue is false, the user cant validate the dialog
{
    ImGui::TextColored(ImVec4(0, 1, 1, 1), "Infos Pane");
    ImGui::Text("Selected Filter : %s", vFilter.c_str());
    if (vUserDatas)
        ImGui::Text("UserDatas : %s", vUserDatas);
    ImGui::Checkbox("if not checked you cant validate the dialog", &canValidateDialog);
    if (vCantContinue)
        *vCantContinue = canValidateDialog;
}

void drawGui()
{
  // open Dialog with Pane
  if (ImGui::Button("Open File Dialog with a custom pane"))
    ImGuiFileDialog::Instance()->OpenDialog("ChooseFileDlgKey", "Choose File", ".cpp,.h,.hpp",
            ".", "", std::bind(&InfosPane, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3), 350, 1, UserDatas("InfosPane"));

  // display and action if ok
  if (ImGuiFileDialog::Instance()->Display("ChooseFileDlgKey")) 
  {
    if (ImGuiFileDialog::Instance()->IsOk())
    {
        std::string filePathName = ImGuiFileDialog::Instance()->GetFilePathName();
        std::string filePath = ImGuiFileDialog::Instance()->GetCurrentPath();
        std::string filter = ImGuiFileDialog::Instance()->GetCurrentFilter();
        // here convert from string because a string was passed as a userDatas, but it can be what you want
        std::string userDatas;
        if (ImGuiFileDialog::Instance()->GetUserDatas())
            userDatas = std::string((const char*)ImGuiFileDialog::Instance()->GetUserDatas()); 
        auto selection = ImGuiFileDialog::Instance()->GetSelection(); // multiselection

        // action
    }
    // close
    ImGuiFileDialog::Instance()->Close();
  }
}

File Style : Custom icons and colors by extension :

You can define style for files/dirs/links in many ways :

the style can be colors, icons and fonts

the general form is :

ImGuiFileDialog::Instance()->SetFileStyle(styleType, criteria, color, icon, font);

Predefined Form :

styleType can be thoses :

IGFD_FileStyleByTypeFile				// define style for all files
IGFD_FileStyleByTypeDir					// define style for all dir
IGFD_FileStyleByTypeLink				// define style for all link
IGFD_FileStyleByExtention				// define style by extention, for files or links
IGFD_FileStyleByFullName				// define style for particular file/dir/link full name (filename + extention)
IGFD_FileStyleByContainedInFullName		// define style for file/dir/link when criteria is contained in full name

Lambda Function Form :

You can define easily your own style include your own detection by using lambda function :

** To note, this mode is not available with the C API **

this lamba will treat a file and return a shared pointer of your files style

see in action a styling of all files and dir starting by a dot

this lambda input a FileInfos and output a FileStyle return true if a FileStyle was defined

ImGuiFileDialog::Instance()->SetFileStyle([](const IGFD::FileInfos& vFile, IGFD::FileStyle &vOutStyle) -> bool {
	if (!vFile.fileNameExt.empty() && vFile.fileNameExt[0] == '.') { 
		vOutStyle = IGFD::FileStyle(ImVec4(0.0f, 0.9f, 0.9f, 1.0f), ICON_IGFD_REMOVE); 
		return true;
	}
	return false;
});

see sample app for the code in action

Samples :

ImGuiFileDialog accepts icon font macros as well as text tags for file types.

ImGuIFontStudio is useful here. I wrote it to make it easy to create custom icon sets for use with Dear ImGui.

It is inspired by IconFontCppHeaders, which can also be used with ImGuiFileDialog.

samples :

// define style by file extention and Add an icon for .png files
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtention, ".png", ImVec4(0.0f, 1.0f, 1.0f, 0.9f), ICON_IGFD_FILE_PIC, font1);
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtention, ".gif", ImVec4(0.0f, 1.0f, 0.5f, 0.9f), "[GIF]");

// define style for all directories
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByTypeDir, "", ImVec4(0.5f, 1.0f, 0.9f, 0.9f), ICON_IGFD_FOLDER);
// can be for a specific directory
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByTypeDir, ".git", ImVec4(0.5f, 1.0f, 0.9f, 0.9f), ICON_IGFD_FOLDER);

// define style for all files
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByTypeFile, "", ImVec4(0.5f, 1.0f, 0.9f, 0.9f), ICON_IGFD_FILE);
// can be for a specific file
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByTypeFile, ".git", ImVec4(0.5f, 1.0f, 0.9f, 0.9f), ICON_IGFD_FILE);

// define style for all links
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByTypeLink, "", ImVec4(0.5f, 1.0f, 0.9f, 0.9f));
// can be for a specific link
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByTypeLink, "Readme.md", ImVec4(0.5f, 1.0f, 0.9f, 0.9f));

// define style for any files/dirs/links by fullname
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByFullName, "doc", ImVec4(0.9f, 0.2f, 0.0f, 0.9f), ICON_IGFD_FILE_PIC);

// define style by file who are containing this string
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByContainedInFullName, ".git", ImVec4(0.9f, 0.2f, 0.0f, 0.9f), ICON_IGFD_BOOKMARK);

all of theses can be miwed with IGFD_FileStyleByTypeDir / IGFD_FileStyleByTypeFile / IGFD_FileStyleByTypeLink
like theses by ex :
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByTypeDir | IGFD_FileStyleByContainedInFullName, ".git", ImVec4(0.9f, 0.2f, 0.0f, 0.9f), ICON_IGFD_BOOKMARK);
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByTypeFile | IGFD_FileStyleByFullName, "cmake", ImVec4(0.5f, 0.8f, 0.5f, 0.9f), ICON_IGFD_SAVE);

// for all these,s you can use a regex
// ex for color files like Custom*.h
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByFullName, "((Custom.+[.]h))", ImVec4(0.0f, 1.0f, 1.0f, 0.9f), ICON_IGFD_FILE_PIC, font1);

// lambda function
// set file style with a lambda function
// return true is a file style was defined
ImGuiFileDialog::Instance()->SetFileStyle([](const IGFD::FileInfos& vFile, IGFD::FileStyle &vOutStyle) -> bool {
	if (!vFile.fileNameExt.empty() && vFile.fileNameExt[0] == '.') { 
		vOutStyle = IGFD::FileStyle(ImVec4(0.0f, 0.9f, 0.9f, 1.0f), ICON_IGFD_REMOVE); 
		return true;
	}
	return false;
});

this sample code of master/main.cpp produce the picture above :

ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtention, ".cpp", ImVec4(1.0f, 1.0f, 0.0f, 0.9f));
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtention, ".h", ImVec4(0.0f, 1.0f, 0.0f, 0.9f));
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtention, ".hpp", ImVec4(0.0f, 0.0f, 1.0f, 0.9f));
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtention, ".md", ImVec4(1.0f, 0.0f, 1.0f, 0.9f));
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtention, ".png", ImVec4(0.0f, 1.0f, 1.0f, 0.9f), ICON_IGFD_FILE_PIC); // add an icon for the filter type
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtention, ".gif", ImVec4(0.0f, 1.0f, 0.5f, 0.9f), "[GIF]"); // add an text for a filter type
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByTypeDir, nullptr, ImVec4(0.5f, 1.0f, 0.9f, 0.9f), ICON_IGFD_FOLDER); // for all dirs
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByTypeFile, "CMakeLists.txt", ImVec4(0.1f, 0.5f, 0.5f, 0.9f), ICON_IGFD_ADD);
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByFullName, "doc", ImVec4(0.9f, 0.2f, 0.0f, 0.9f), ICON_IGFD_FILE_PIC);
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByTypeDir | IGFD_FileStyleByContainedInFullName, ".git", ImVec4(0.9f, 0.2f, 0.0f, 0.9f), ICON_IGFD_BOOKMARK);
ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByTypeFile | IGFD_FileStyleByContainedInFullName, ".git", ImVec4(0.5f, 0.8f, 0.5f, 0.9f), ICON_IGFD_SAVE);

Filter Collections :

You can define a custom filter name that corresponds to a group of filters using this syntax:

You can also use a regex for the filtering. the regex must be betwwen the ( and ) for be recognized as a regex

custom_name1{filter1,filter2,filter3,(regex0),(regex1)},custom_name2{filter1,filter2,(regex0)},filter1

When you select custom_name1, filters 1 to 3 will be applied. The characters { and } are reserved. Don't use them for filter names.

this code :

const char *filters = "Source files (*.cpp *.h *.hpp){.cpp,.h,.hpp},Image files (*.png *.gif *.jpg *.jpeg){.png,.gif,.jpg,.jpeg},.md";
ImGuiFileDialog::Instance()->OpenDialog("ChooseFileDlgKey", ICON_IMFDLG_FOLDER_OPEN " Choose a File", filters, ".");

will produce :

Multi Selection :

You can define in OpenDialog call the count file you want to select :

• 0 => infinite
• 1 => one file only (default)
• n => n files only

See the define at the end of these funcs after path.

ImGuiFileDialog::Instance()->OpenDialog("ChooseFileDlgKey", "Choose File", ".*,.cpp,.h,.hpp", ".");
ImGuiFileDialog::Instance()->OpenDialog("ChooseFileDlgKey", "Choose 1 File", ".*,.cpp,.h,.hpp", ".", 1);
ImGuiFileDialog::Instance()->OpenDialog("ChooseFileDlgKey", "Choose 5 File", ".*,.cpp,.h,.hpp", ".", 5);
ImGuiFileDialog::Instance()->OpenDialog("ChooseFileDlgKey", "Choose many File", ".*,.cpp,.h,.hpp", ".", 0);
ImGuiFileDialog::Instance()->OpenDialog("ChooseFileDlgKey", "Choose File", ".png,.jpg",
   ".", "", std::bind(&InfosPane, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3), 350, 1, "SaveFile"); // 1 file

File Dialog Constraints :

You can set the minimum and/or maximum size of the dialog:

ImVec2 maxSize = ImVec2((float)display_w, (float)display_h);  // The full display area
ImVec2 minSize = maxSize * 0.5f;  // Half the display area
ImGuiFileDialog::Instance()->Display("ChooseFileDlgKey", ImGuiWindowFlags_NoCollapse, minSize, maxSize);

Exploring by keys :

You can activate this feature by uncommenting #define USE_EXPLORATION_BY_KEYS in your custom config file (CustomImGuiFileDialogConfig.h)

You can also uncomment the next lines to define navigation keys:

• IGFD_KEY_UP => Up key for explore to the top
• IGFD_KEY_DOWN => Down key for explore to the bottom
• IGFD_KEY_ENTER => Enter key for open directory
• IGFD_KEY_BACKSPACE => BackSpace for comming back to the last directory

You can also jump to a point in the file list by pressing the corresponding key of the first filename character.

As you see the current item is flashed by default for 1 second. You can define the flashing lifetime with the function

ImGuiFileDialog::Instance()->SetFlashingAttenuationInSeconds(1.0f);

Bookmarks :

You can create/edit/call path bookmarks and load/save them.

Activate this feature by uncommenting: #define USE_BOOKMARK in your custom config file (CustomImGuiFileDialogConfig.h)

More customization options:

#define bookmarkPaneWith 150.0f => width of the bookmark pane
#define IMGUI_TOGGLE_BUTTON ToggleButton => customize the Toggled button (button stamp must be : (const char* label, bool *toggle)
#define bookmarksButtonString "Bookmark" => the text in the toggle button
#define bookmarksButtonHelpString "Bookmark" => the helper text when mouse over the button
#define addBookmarkButtonString "+" => the button for add a bookmark
#define removeBookmarkButtonString "-" => the button for remove the selected bookmark

• You can select each bookmark to edit the displayed name corresponding to a path
• Double-click on the label to apply the bookmark

You can also serialize/deserialize bookmarks (for example to load/save from/to a file):

Load => ImGuiFileDialog::Instance()->DeserializeBookmarks(bookmarString);
Save => std::string bookmarkString = ImGuiFileDialog::Instance()->SerializeBookmarks();

you can also add/remove bookmark by code :

and in this case, you can also avoid serialization of code based bookmark

Add => ImGuiFileDialog::Instance()->AddBookmark(bookmark_name, bookmark_path);
Remove => ImGuiFileDialog::Instance()->RemoveBookmark(bookmark_name);

// true for prevent serialization of code based bookmarks
Save => std::string bookmarkString = ImGuiFileDialog::Instance()->SerializeBookmarks(true);

(please see example code for details)

Path Edition :

Right clicking on any path element button allows the user to manually edit the path from that portion of the tree. Pressing the completion key (GLFW uses enter by default) validates the new path. Pressing the cancel key (GLFW usesescape by default) cancels the manual entry and restores the original path.

Here's the manual entry operation in action:

Confirm Overwrite Dialog :

If you want avoid overwriting files after selection, ImGuiFileDialog can show a dialog to confirm or cancel the operation.

To do so, define the flag ImGuiFileDialogFlags_ConfirmOverwrite in your call to OpenDialog/OpenModal.

By default this flag is not set since there is no pre-defined way to define if a dialog will be for Open or Save behavior. (by design! :) )

Example code For Standard Dialog :

ImGuiFileDialog::Instance()->OpenDialog("ChooseFileDlgKey",
    ICON_IGFD_SAVE " Choose a File", filters,
    ".", "", 1, nullptr, ImGuiFileDialogFlags_ConfirmOverwrite);

Example code For Modal Dialog :

ImGuiFileDialog::Instance()->OpenDialog("ChooseFileDlgKey",
    ICON_IGFD_SAVE " Choose a File", filters,
    ".", "", 1, nullptr, ImGuiFileDialogFlags_Modal | ImGuiFileDialogFlags_ConfirmOverwrite);

This dialog will only verify the file in the file field, not with GetSelection().

The confirmation dialog will be a non-movable modal (input blocking) dialog displayed in the middle of the current ImGuiFileDialog window.

As usual, you can customize the dialog in your custom config file (CustomImGuiFileDialogConfig.h in this example)

Uncomment these line for customization options:

//#define OverWriteDialogTitleString "The file Already Exist !"
//#define OverWriteDialogMessageString "Would you like to OverWrite it ?"
//#define OverWriteDialogConfirmButtonString "Confirm"
//#define OverWriteDialogCancelButtonString "Cancel"

See the result :

Open / Save dialog Behavior :

ImGuiFileDialog uses the same code internally for Open and Save dialogs. To distinguish between them access the various data return functions depending on what the dialog is doing.

When selecting an existing file (for example, a Load or Open dialog), use

std::map<std::string, std::string> GetSelection(); // Returns selection via a map<FileName, FilePathName>
UserDatas GetUserDatas();                          // Get user data provided by the Open dialog

To selecting a new file (for example, a Save As... dialog), use:

std::string GetFilePathName();                     // Returns the content of the selection field with current file extension and current path
std::string GetCurrentFileName();                  // Returns the content of the selection field with current file extension but no path
std::string GetCurrentPath();                      // Returns current path only
std::string GetCurrentFilter();                    // The file extension

Thumbnails Display :

You can now, display thumbnails of pictures.

The file resize use stb/image so the following files extentions are supported :

• .png (tested sucessfully)
• .bmp (tested sucessfully)
• .tga (tested sucessfully)
• .jpg (tested sucessfully)
• .jpeg (tested sucessfully)
• .gif (tested sucessfully_ but not animation just first frame)
• .psd (not tested)
• .pic (not tested)
• .ppm (not tested)
• .pgm (not tested)

Corresponding to your backend (ex : OpenGl) you need to define two callbacks :

• the first is a callback who will be called by ImGuiFileDialog for create the backend texture
• the second is a callback who will be called by ImGuiFileDialog for destroy the backend texture

After that you need to call the function who is responsible to create / destroy the textures. this function must be called in your GPU Rendering zone for avoid destroying of used texture. if you do that at the same place of your imgui code, some backend can crash your app, by ex with vulkan.

To Clarify :

This feature is spliited in two zones :

• CPU Zone : for load/destroy picture file
• GPU Zone : for load/destroy gpu textures. This modern behavior for avoid destroying of used texture, was needed for vulkan.

This feature was Successfully tested on my side with Opengl and Vulkan. But im sure is perfectly compatible with other modern apis like DirectX and Metal

ex, for opengl :

// Create thumbnails texture
ImGuiFileDialog::Instance()->SetCreateThumbnailCallback([](IGFD_Thumbnail_Info *vThumbnail_Info) -> void
{
	if (vThumbnail_Info && 
		vThumbnail_Info->isReadyToUpload && 
		vThumbnail_Info->textureFileDatas)
	{
		GLuint textureId = 0;
		glGenTextures(1, &textureId);
		vThumbnail_Info->textureID = (void*)textureId;

		glBindTexture(GL_TEXTURE_2D, textureId);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
			(GLsizei)vThumbnail_Info->textureWidth, (GLsizei)vThumbnail_Info->textureHeight, 
			0, GL_RGBA, GL_UNSIGNED_BYTE, vThumbnail_Info->textureFileDatas);
		glFinish();
		glBindTexture(GL_TEXTURE_2D, 0);

		delete[] vThumbnail_Info->textureFileDatas;
		vThumbnail_Info->textureFileDatas = nullptr;

		vThumbnail_Info->isReadyToUpload = false;
		vThumbnail_Info->isReadyToDisplay = true;
	}
});

// Destroy thumbnails texture
ImGuiFileDialog::Instance()->SetDestroyThumbnailCallback([](IGFD_Thumbnail_Info* vThumbnail_Info)
{
	if (vThumbnail_Info)
	{
		GLuint texID = (GLuint)vThumbnail_Info->textureID;
		glDeleteTextures(1, &texID);
		glFinish();
	}
});

// GPU Rendering Zone // To call for Create/ Destroy Textures
ImGuiFileDialog::Instance()->ManageGPUThumbnails();

Embedded in other frames :

The dialog can be embedded in another user frame than the standard or modal dialog

You have to create a variable of type ImGuiFileDialog. (if you are suing the singleton, you will not have the possibility to open other dialog)

ex :

ImGuiFileDialog fileDialog;

// open dialog; in this case, Bookmark, directory creation are disabled with, and also the file input field is readonly.
// btw you can od what you want
fileDialog.OpenDialog("embedded", "Select File", ".*", "", -1, nullptr, 
	ImGuiFileDialogFlags_NoDialog | 
	ImGuiFileDialogFlags_DisableBookmarkMode | 
	ImGuiFileDialogFlags_DisableCreateDirectoryButton | 
	ImGuiFileDialogFlags_ReadOnlyFileNameField);
// then display, here 
// to note, when embedded the ImVec2(0,0) (MinSize) do nothing, only the ImVec2(0,350) (MaxSize) can size the dialog frame 
fileDialog.Display("embedded", ImGuiWindowFlags_NoCollapse, ImVec2(0,0), ImVec2(0,350)))

the result :

Quick Parallel Path Selection in Path Composer :

you have a separator between two directories in the path composer when you click on it you can explore a list of parrallels directories of this point

this feature is disabled by default you can enable it with the compiler flag : #define USE_QUICK_PATH_SELECT

you can also customize the spacing between path button's with and without this mode you can do that by define the compiler flag : #define CUSTOM_PATH_SPACING 2 if undefined the spacing is defined by the imgui theme

Case Insensitive Filtering :

you can use this flag 'ImGuiFileDialogFlags_CaseInsensitiveExtention' when you call the open functions

by ex :
if the flag ImGuiFileDialogFlags_CaseInsensitiveExtention is used
with filters like .jpg or .Jpg or .JPG
all files with extentions by ex : .jpg and .JPG will be displayed

How to Integrate ImGuiFileDialog in your project :

Customize ImGuiFileDialog :

You can customize many aspects of ImGuiFileDialog by overriding ImGuiFileDialogConfig.h.

To enable your customizations, define the preprocessor directive CUSTOM_IMGUIFILEDIALOG_CONFIG with the path of your custom config file. This path must be relative to the directory where you put the ImGuiFileDialog module.

This operation is demonstrated in CustomImGuiFileDialog.h in the example project to:

• Have a custom icon font instead of labels for buttons or message titles
• Customize the button text (the button call signature must be the same, by the way! :)

The custom icon font used in the example code (CustomFont.cpp and CustomFont.h) was made with ImGuiFontStudio, which I wrote. :)

ImGuiFontStudio uses ImGuiFileDialog! Check it out.

Overriding ImGuiFileDialog :

You can also override it to draw differently or to add/remove widgets.

Take a look at the example application where I show how to use it to display a read-only checkbox.

see the 'CustomDrawReadOnlyCheckBoxFileDialog' class.

Tune the validations button group :

You can specify :

• the width of "ok" and "cancel" buttons, by the set the defines "okButtonWidth" and "cancelButtonWidth"
• the alignement of the button group (left, right, middle, etc..) by set the define "okCancelButtonAlignement"
• if you want to have the ok button on the left and cancel button on the right or inverted by set the define "invertOkAndCancelButtons"

just see theses defines in the config file

//Validation buttons
//#define okButtonString " OK"
//#define okButtonWidth 0.0f
//#define cancelButtonString " Cancel"
//#define cancelButtonWidth 0.0f
//alignement [0:1], 0.0 is left, 0.5 middle, 1.0 right, and other ratios
//#define okCancelButtonAlignement 0.0f
//#define invertOkAndCancelButtons false

with Alignement 0.0 => left

with Alignement 1.0 => right

with Alignement 0.5 => middle

ok and cancel buttons inverted (cancel on the left and ok on the right)

Filtering by a regex :

you can use a regex for filtering and file Styling

for have a filter recognized as a regex, you must have it between a (( and a ))

this one will filter files who start by the word "Common" and finish by ".h"

ex : "((Custom.+[.]h))"

use cases :

• Simple filter :

OpenDialog("toto", "Choose File", "((Custom.+[.]h))");

• Collections filter : for this one the filter is between "{" and "}", so you can use the "(" and ")" outside

OpenDialog("toto", "Choose File", "Source files (*.cpp *.h *.hpp){((Custom.+[.]h)),.h,.hpp}");

• file coloring : this one will colorized all files who start by the word "Common" and finish by ".h"

SetFileStyle(IGFD_FileStyleByFullName, "((Custom.+[.]h))", ImVec4(1.0f, 1.0f, 0.0f, 0.9f));

• with this feature you can by ex filter and colorize render frame pictures who have ext like .000, .001, .002, etc..

OpenDialog("toto", "Choose File", "(([.][0-9]{3}))");
SetFileStyle(IGFD_FileStyleByFullName, "(([.][0-9]{3}))", ImVec4(1.0f, 1.0f, 0.0f, 0.9f));

Multi Layer / asterisk based filter :

you can add filter in the form : .a.b.c .json.cpp .vcxproj.filters

you can also add filter in the form : .* .. .vcx.* ..filters .vcx.filt.* etc.. all the * based filter are internally using regex's

Result Modes for GetFilePathName, getFileName and GetSelection :

you can add have various behavior when you get the file results at dialog end

you can specify a result mode to thoses function :

GetFilePathName(IGFD_ResultMode = IGFD_ResultMode_AddIfNoFileExt)
GetFileName(IGFD_ResultMode = IGFD_ResultMode_AddIfNoFileExt)
GetFileSelection(IGFD_ResultMode = IGFD_ResultMode_KeepInputFile)

You can see these function who their default modes. but you can modify them.

There is 3 Modes :

IGFD_ResultMode_AddIfNoFileExt [DEFAULT for 
This mode add the filter ext only if there is no file ext. (compatible multi layer)
ex : 
   filter {.cpp,.h} with file :
     toto.h => toto.h
     toto.a.h => toto.a.h
     toto.a. => toto.a.cpp
     toto. => toto.cpp
     toto => toto.cpp
   filter {.z,.a.b} with file :
     toto.a.h => toto.a.h
     toto. => toto.z
     toto => toto.z
   filter {.g.z,.a} with file :
     toto.a.h => toto.a.h
     toto. => toto.g.z
     toto => toto.g.z

IGFD_ResultMode_OverwriteFileExt
This mode Overwrite the file extention by the current filter
This mode is the old behavior for imGuiFileDialog pre v0.6.6
ex : 
   filter {.cpp,.h} with file :
     toto.h => toto.cpp
     toto.a.h => toto.a.cpp
     toto.a. => toto.a.cpp
     toto.a.h.t => toto.a.h.cpp
     toto. => toto.cpp
     toto => toto.cpp
   filter {.z,.a.b} with file :
     toto.a.h => toto.z
     toto.a.h.t => toto.a.z
     toto. => toto.z
     toto => toto.z
   filter {.g.z,.a} with file :
     toto.a.h => toto.g.z
     toto.a.h.y => toto.a.g.z
     toto.a. => toto.g.z
     toto. => toto.g.z
     toto => toto.g.z

IGFD_ResultMode_KeepInputFile
This mode keep the input file. no modification
es :
   filter {.cpp,.h} with file :
      toto.h => toto.h
      toto. => toto.
      toto => toto
   filter {.z,.a.b} with file :
      toto.a.h => toto.a.h
      toto. => toto.
      toto => toto
   filter {.g.z,.a} with file :
      toto.a.h => toto.a.h
      toto. => toto.
      toto => toto

to note :

• in case of a collection of filter. the default filter will be the first. so in collection {.cpp,((.vcxproj.)), .ft.}, the default filter used for renaming will be .cpp
• when you have multilayer filter in collection. we consider a filter to be replaced according to the max dot of filters for a whole collection a collection {.a, .b.z} is a two dots filter, so a file toto.g.z will be replaced by toto.a a collection {.z; .b} is a one dot filter, so a file toto.g.z will be replaced by toto.g.a

Api's C/C++ :

the C Api

this api was sucessfully tested with CImGui

A C API is available let you include ImGuiFileDialog in your C project. btw, ImGuiFileDialog depend of ImGui and dirent (for windows)

Sample code with cimgui :

// create ImGuiFileDialog
ImGuiFileDialog *cfileDialog = IGFD_Create();

// open dialog
if (igButton("Open File", buttonSize))
{
	IGFD_OpenDialog(cfiledialog,
		"filedlg",                              // dialog key (make it possible to have different treatment reagrding the dialog key
		"Open a File",                          // dialog title
		"c files(*.c *.h){.c,.h}",              // dialog filter syntax : simple => .h,.c,.pp, etc and collections : text1{filter0,filter1,filter2}, text2{filter0,filter1,filter2}, etc..
		".",                                    // base directory for files scan
		"",                                     // base filename
		0,                                      // a fucntion for display a right pane if you want
		0.0f,                                   // base width of the pane
		0,                                      // count selection : 0 infinite, 1 one file (default), n (n files)
		"User data !",                          // some user datas
		ImGuiFileDialogFlags_ConfirmOverwrite); // ImGuiFileDialogFlags
}

ImGuiIO* ioptr = igGetIO();
ImVec2 maxSize;
maxSize.x = ioptr->DisplaySize.x * 0.8f;
maxSize.y = ioptr->DisplaySize.y * 0.8f;
ImVec2 minSize;
minSize.x = maxSize.x * 0.25f;
minSize.y = maxSize.y * 0.25f;

// display dialog
if (IGFD_DisplayDialog(cfiledialog, "filedlg", ImGuiWindowFlags_NoCollapse, minSize, maxSize))
{
	if (IGFD_IsOk(cfiledialog)) // result ok
	{
		char* cfilePathName = IGFD_GetFilePathName(cfiledialog);
		printf("GetFilePathName : %s\n", cfilePathName);
		char* cfilePath = IGFD_GetCurrentPath(cfiledialog);
		printf("GetCurrentPath : %s\n", cfilePath);
		char* cfilter = IGFD_GetCurrentFilter(cfiledialog);
		printf("GetCurrentFilter : %s\n", cfilter);
		// here convert from string because a string was passed as a userDatas, but it can be what you want
		void* cdatas = IGFD_GetUserDatas(cfiledialog);
		if (cdatas)
			printf("GetUserDatas : %s\n", (const char*)cdatas);
		struct IGFD_Selection csel = IGFD_GetSelection(cfiledialog); // multi selection
		printf("Selection :\n");
		for (int i = 0; i < (int)csel.count; i++)
		{
			printf("(%i) FileName %s => path %s\n", i, csel.table[i].fileName, csel.table[i].filePathName);
		}
		// action

		// destroy
		if (cfilePathName) free(cfilePathName);
		if (cfilePath) free(cfilePath);
		if (cfilter) free(cfilter);

		IGFD_Selection_DestroyContent(&csel);
	}
	IGFD_CloseDialog(cfiledialog);
}

// destroy ImGuiFileDialog
IGFD_Destroy(cfiledialog);

How to build the sample app :

The sample app is [here in master branch]((https://github.com/aiekick/ImGuiFileDialog/tree/master)

You need to use cMake. For the 3 Os (Win, Linux, MacOs), the cMake usage is exactly the same,

Choose a build directory. (called here my_build_directory for instance) and
Choose a Build Mode : "Release" / "MinSizeRel" / "RelWithDebInfo" / "Debug" (called here BuildMode for instance)
Run cMake in console : (the first for generate cmake build files, the second for build the binary)

cmake -B my_build_directory -DCMAKE_BUILD_TYPE=BuildMode cmake --build my_build_directory --config BuildMode

Some cMake version need Build mode define via the directive CMAKE_BUILD_TYPE or via --Config when we launch the build. This is why i put the boths possibilities

By the way you need before, to make sure, you have needed dependencies.

On Windows :

You need to have the opengl library installed

On Linux :

You need many lib : (X11, xrandr, xinerama, xcursor, mesa)

If you are on debian you can run :

sudo apt-get update sudo apt-get install libgl1-mesa-dev libx11-dev libxi-dev libxrandr-dev libxinerama-dev libxcursor-dev

On MacOs :

you need many lib : opengl and cocoa framework

Thats all folks :-)

You can check by example in this repo with the file CustomImGuiFileDialogConfig.h :

• this trick was used for have custom icon font instead of labels for buttons or messages titles
• you can also use your custom imgui button, the button call stamp must be same by the way :)

The Custom Icon Font (in CustomFont.cpp and CustomFont.h) was made with ImGuiFontStudio (https://github.com/aiekick/ImGuiFontStudio) i wrote for that :) ImGuiFontStudio is using also ImGuiFileDialog.$