seanchas116 / qtimgui

Qt (QOpenGLWidget / QOpenGLWindow) backend for ImGui

QtImGui

Qt (QOpenGLWidget / QOpenGLWindow) backend for ImGui

It enables ImGui to run in QOpenGLWidget / QOpenGLWindow.

How to use

• Add QtImGui sources and headers to your project
  • If you are using git submodule, run git submodule update --init --recursive to ensure that the inner submodule is initialized as well.
• CMake:
  • Add add_subdirectory(path/to/qtimgui) to your CMakeLists.txt file
  • Link qt_imgui_quick (for Qt Quick apps or apps that don't use QOpenGLWidget) or qt_imgui_widget (for apps using QOpenGLWidget)
• qmake:
  • Add include(path/to/qtimgui/qtimgui.pri) to your .pro file
• Subclass QOpenGLWindow or QOpenGLWidget and:

class DemoWindow : public QOpenGLWindow
{
protected:
    void initializeGL() override
    {
        QtImGui::initialize(this);
    }
    void paintGL() override
    {
        // you can do custom GL rendering as well in paintGL

        QtImGui::newFrame();

        ImGui::Text("Hello");
        // more widgets...

        ImGui::Render();
        QtImGui::render();
    }
};

See QOpenGLWidget example and QOpenGLWindow example for details.

Specific notes for Android, when using cmake

Two projects are provided: qtimgui.pro and CMakeLists.txt.

When using CMake under Android, this project will uses qt-android-cmake, which is a CMake utility for building and deploying Qt based applications on Android without Qt Creator.

In order to successfuly deploy the app to a device, the cmake variable ANDROID_NATIVE_API_LEVEL should elevated to 21 or 26 (depending on the native levels installed in your android sdk) You will need to set it via the CMake command line, or inside Qt Creator (in the project view).

qtimgui's Issues

it seems not support the latest IMGUI version anymore.

Hi, when using latest IMGUI , there is a 'error ' pop up dialog show up again and again. But runs fine under your version.
Would you fix it?
thanks.

Copy & paste shortcuts don't work (Mac)

Mac os display error!

on Mac os. the contents on the window don't display normally. It display only when I drag the window to the top left corner of the big main window.

Support Qt6

not showing imgui

I compiled and run your project, but a main window shown up, no imgui window, could you tell me what's wrong? I used visual studio 2015 to convert you .pro project to a vs project with qt-vs-tools-msvc2015-2.1.1， with Qt5.8 enviroment. thank you.

i actually hope this Dear ImGui can work under Qt4.86 (since one of my project is constructed under this). is it possible? thank you .

winston

IME seems not support in inputtext

Input Method Editors can't use in inputtext,but it's ok in gltf backend on windows.

I find the code in glfw backend ,need add something like this:

  #if defined(_WIN32)
      ImGui::GetMainViewport()->PlatformHandleRaw = (void*)glfwGetWin32Window(bd->Window);
  #endif

when resizing the window, the windows background will be blinking continuously.

The building and running environment is Qt5.13.2 for windows 10.

Using QtImGui with multiple QOpenGLWidgets?

Is it possible to use QtImGui with multiple QOpenGLWidgets sharing the same class? I'm calling QtImGui functions while QOpenGLWidget is underMouse() which prevents crashing but ImGui does not render in the other active viewports, only the first one.

does this project can create multi window or widgets?

Support QQuickFramebufferObject

backend using io.KeyMap[], io.KeysDown[] should call io.AddKeyEvent() instaed

[Problem]
According to imgui release v1.87 :
2022/02/29: We discovered a backward-compatibility regression in 18700:
Direct legacy reads from io.KeysDown[] won't work with new backends.
And in particular io.KeysDown[GetKeyIndex[XXX]) will buffer overflow in old and new backends.
You can refer to https://github.com/ocornut/imgui/issues/4921
[Solution]
Backend writing to io.KeyMap[], io.KeysDown[] -> backend should call io.AddKeyEvent()

Cannot scroll in Windows

Demo crash when using ImGui branch docking

Describe the bug
Switch ImGui branch to docking branch then run demo, demo crashed, print assert meesage:

Assertion failed: (g.IO.KeyMap[n] >= -1 && g.IO.KeyMap[n] < ((int)(sizeof(g.IO.KeysDown) / sizeof(*(g.IO.KeysDown)))) && "io.KeyMap[] contains an out of bound value (need to be 0..511, or -1 for unmapped key)"), function ErrorCheckNewFrameSanityChecks, file imgui.cpp, line 8557.

Using master ImGui branch is ok, even I check out a new branch from docking and merge master, it also crashed, could you give me some help? Thank you.

No rule to make target

No rule to make target '../../qtimgui-master/imgui/imgui_draw.cpp', needed by 'debug/imgui_draw.o'. Stop.

qtimgui does not seem to support multiple OpenGLWidgets

qtimgui does not seem to support multiple OpenGLWidgets

BUG: incorrect background for pop up modals

Describe the bug
Incorrect background color for modal windows.

• Same as ocornut/imgui#4845 and others.
• Also referenced in the release https://github.com/ocornut/imgui/releases/tag/v1.86
• Similar fix as ocornut/imgui@c80e8b9

Note that I am using imgui 1.89.2.WIP with docking plus some fixes for the keyboard from #44

To Reproduce
Just open the modal popup window as shown in the screenshot.

Screenshots

Expected

I already got it working so will post a PR 😃 solving this specifically, no other changes

BUG: Mouse pos being updated when other widget has focus

Describe the bug

Currently the imgui mouse pos is updated whenever the widget window/window is active. But in the case of widgets windows it also makes sense to check the focus. Otherwise a mouse over the area can trigger hovering effects in imgui when the user is interacting with other QT widgets.

//... ImGuiRenderer.cpp
if (m_window->isActive()) // + also check focus in case of widget
{
    const QPoint pos = m_window->mapFromGlobal(QCursor::pos());
    io.MousePos = ImVec2(pos.x(), pos.y());
}
else
{
    io.MousePos = ImVec2(-1,-1);
}

To Reproduce
Have any widget like a combo box that expands over the widgets area when interacted.

Expected behavior
Imgui mouse pos should not be updated when the widget has no focus other widget has focus to avoid hovering triggers.

Desktop (please complete the following information):

• OS: Win10. Note that I am using imgui 1.89.2.WIP with docking plus some fixes for the keyboard, etc.

Add package to qpm

Add package to https://www.qpm.io/

Probably #4 is not working well.

QT not forwarding "double mouse click" events

I'm on windows 10.
A lot of the button widgets don't respond to rapid left-clicks.

I found a bug in the event filter that blocks the QEvent::MouseButtonDblClick events from progressing to imgui.

If I add this to the eventFilter switch statement, the double click events are passed to imgui, and the buttons then respond to rapid left clicks.

You can test this by checking the demo "double click" debug field to make sure the events are getting to imgui. See below for source code change location, and test location.

add wasm support

See https://github.com/blockspacer/qtimgui-wasm-port

Support cmake