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Showing content from https://github.com/AirGuanZ/imgui-filebrowser below:

AirGuanZ/imgui-filebrowser: File browser implementation for dear-imgui. C++17 is required.

imgui-filebrowser is a header-only file browser implementation for dear-imgui. C++ 17 is required.

imfilebrowser.h should be included after imgui.h:

#include <imgui.h>
#include <imfilebrowser.h>

Instead of creating a file dialog with an immediate function call, you need to create a ImGui::FileBrowser instance, open it with member function Open(), and call Display() in each frame. Here is a simple example:

#include <imgui.h>
#include <imfilebrowser.h>

int main()
{
    //...initialize rendering window and imgui
    
    // create a file browser instance
    ImGui::FileBrowser fileDialog;
    
    // (optional) set browser properties
    fileDialog.SetTitle("title");
    fileDialog.SetTypeFilters({ ".h", ".cpp" });
    
    // mainloop
    while(continueRendering)
    {
        //...do other stuff like ImGui::NewFrame();
        
        if(ImGui::Begin("dummy window"))
        {
            // open file dialog when user clicks this button
            if(ImGui::Button("open file dialog"))
                fileDialog.Open();
        }
        ImGui::End();
        
        fileDialog.Display();
        
        if(fileDialog.HasSelected())
        {
            std::cout << "Selected filename" << fileDialog.GetSelected().string() << std::endl;
            fileDialog.ClearSelected();
        }
        
        //...do other stuff like ImGui::Render();
    }
    
    //...shutdown
}

Various options can be combined with '|' and passed to the constructor:

enum ImGuiFileBrowserFlags_
{
    ImGuiFileBrowserFlags_SelectDirectory       = 1 << 0, // select directory instead of regular file
    ImGuiFileBrowserFlags_EnterNewFilename      = 1 << 1, // allow user to enter new filename when selecting regular file
    ImGuiFileBrowserFlags_NoModal               = 1 << 2, // file browsing window is modal by default. specify this to use a popup window
    ImGuiFileBrowserFlags_NoTitleBar            = 1 << 3, // hide window title bar
    ImGuiFileBrowserFlags_NoStatusBar           = 1 << 4, // hide status bar at the bottom of browsing window
    ImGuiFileBrowserFlags_CloseOnEsc            = 1 << 5, // close file browser when pressing 'ESC'
    ImGuiFileBrowserFlags_CreateNewDir          = 1 << 6, // allow user to create new directory
    ImGuiFileBrowserFlags_MultipleSelection     = 1 << 7, // allow user to select multiple files. this will hide ImGuiFileBrowserFlags_EnterNewFilename
    ImGuiFileBrowserFlags_HideRegularFiles      = 1 << 8, // hide regular files when ImGuiFileBrowserFlags_SelectDirectory is enabled
    ImGuiFileBrowserFlags_ConfirmOnEnter        = 1 << 9, // confirm selection when pressnig 'ENTER'
    ImGuiFileBrowserFlags_SkipItemsCausingError = 1 << 10, // when entering a new directory, any error will interrupt the process, causing the file browser to fall back to the working directory.
                                                           // with this flag, if an error is caused by a specific item in the directory, that item will be skipped, allowing the process to continue.
    ImGuiFileBrowserFlags_EditPathString        = 1 << 11, // allow user to directly edit the whole path string
};

When ImGuiFileBrowserFlags_MultipleSelection is enabled, use fileBrowser.GetMultiSelected() to get all selected filenames (instead of fileBrowser.GetSelected(), which returns only one of them).

Here are some common examples:

// (default) select single regular file for opening
0
// select multiple regular files for opening
ImGuiFileBrowserFlags_MultipleSelection
// select single directory for opening
ImGuiFileBrowserFlags_SelectDirectory
// select multiple directories for opening
ImGuiFileBrowserFlags_SelectDirectory | ImGuiFileBrowserFlags_MultipleSelection
// select single regular file for saving
ImGuiFileBrowserFlags_EnterNewFilename | ImGuiFileBrowserFlags_CreateNewDir
// select single directory for saving
ImGuiFileBrowserFlags_SelectDirectory | ImGuiFileBrowserFlags_CreateNewDir
// select single directory and hide regular files in browser
ImGuiFileBrowserFlags_SelectDirectory | ImGuiFileBrowserFlags_HideRegularFiles

• When ImGuiFileBrowserFlags_EditPathString is set, click the top-right button # to directly edit the current directory.
• Click the top-right button * to refresh.
• Double click to enter a directory.
• Single click to (de)select a regular file (or directory, if ImGuiFileBrowserFlags_SelectDirectory is enabled).
• When ImGuiFileBrowserFlags_SelectDirectory is enabled and no item is selected, click ok to choose the current directory as selected result.
• When ImGuiFileBrowserFlags_MultipleSelection is enabled, hold Ctrl for multi selection and Shift for range selection.
• When ImGuiFileBrowserFlags_MultipleSelection is enabled, use Ctrl + A to select all (filtered) items.
• When ImGuiFileBrowserFlags_CreateNewDir is enabled, click the top-right button + to create a new directory.
• When ImGuiFileBrowserFlags_SelectDirectory is not specified, double click to choose a regular file as selected result.

• Use SetTypeFilters({".h", ".cpp"}) to set file extension filters.
• .* matches with any extension
• Filters are case-insensitive on Windows platform

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