can run

.gitignore

@@ -67,4 +67,5 @@ compile_commands.json
 CTestTestfile.cmake
 _deps
 CMakeUserPresets.json
+/build
 

CMakeLists.txt

@@ -0,0 +1,38 @@
+cmake_minimum_required(VERSION 3.10)
+project(MotifQtApp LANGUAGES CXX)
+
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+set(CMAKE_AUTOUIC ON)
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(Qt5 COMPONENTS Widgets REQUIRED)
+
+# Motif
+find_package(X11 REQUIRED)
+find_library(MOTIF_LIB Xm)
+
+message(STATUS
+    "MOTIF_LIBRARIES = ${MOTIF_LIBRARIES}\n"
+    "X11_LIBRARIES = ${X11_LIBRARIES}\n"
+    "X11_Xt_LIB = ${X11_Xt_LIB}"
+)
+
+# 源文件
+set(SOURCES
+    motif_app.cpp
+    qt_dialog.cpp
+    qt_dialog.h
+)
+
+# 可执行文件
+add_executable(MotifQtApp ${SOURCES})
+
+# 链接库
+target_link_libraries(MotifQtApp PRIVATE Qt5::Widgets ${MOTIF_LIB} X11::X11 ${X11_Xt_LIB})
+
+target_include_directories(MotifQtApp PRIVATE ${X11_INCLUDE_DIR})

motif_app.cpp

@@ -0,0 +1,70 @@
+#include <QApplication>
+#include <QTimer>
+#include "qt_dialog.h"
+
+// Qt 头文件必须在 Motif/X11 之前
+#include <X11/Intrinsic.h>
+#include <Xm/Xm.h>
+#include <Xm/PushB.h>
+#include <unistd.h> // for usleep
+
+// 全局 Qt 应用和对话框指针
+QApplication *g_app = nullptr;
+
+// 打开 Qt 对话框
+void openQtDialog(Widget w, XtPointer client_data, XtPointer call_data)
+{
+    auto dialog = new QtDialog();
+    dialog->setAttribute(Qt::WA_DeleteOnClose); // 关闭时自动删除
+    dialog->show(); // 非阻塞显示
+}
+
+// Motif 主循环中处理 Qt 事件
+void processQtEvents()
+{
+    if (g_app)
+    {
+        g_app->processEvents();
+    }
+}
+
+int main(int argc, char **argv)
+{
+    XtAppContext app_context;
+    Widget toplevel, button;
+
+    // 创建 QApplication（必须在 Qt 头文件之后）
+    g_app = new QApplication(argc, nullptr);
+
+    // 创建 Motif 主窗口
+    toplevel = XtVaAppInitialize(&app_context, "MotifQtApp", NULL, 0,
+                                 &argc, argv, NULL, NULL);
+
+    button = XtVaCreateManagedWidget("Open Qt Dialog",
+                                     xmPushButtonWidgetClass,
+                                     toplevel, NULL);
+    XtAddCallback(button, XmNactivateCallback, openQtDialog, NULL);
+
+    XtRealizeWidget(toplevel);
+
+    XEvent event;
+    while (1)
+    {
+        while (XtAppPending(app_context))
+        {
+            XtAppNextEvent(app_context, &event);
+            XtDispatchEvent(&event);
+        }
+
+        // 每次空闲处理 Qt 事件
+        processQtEvents();
+
+        // 避免 CPU 空转
+        usleep(1000);
+    }
+
+    // 清理（一般不会执行到这里）
+    delete g_app;
+
+    return 0;
+}

qt_dialog.cpp

@@ -0,0 +1,13 @@
+#include "qt_dialog.h"
+#include <QLabel>
+#include <QVBoxLayout>
+
+QtDialog::QtDialog(QWidget* parent)
+    : QDialog(parent)
+{
+    setWindowTitle("Non-blocking Qt Dialog");
+    QVBoxLayout* layout = new QVBoxLayout(this);
+    QLabel* label = new QLabel("Hello from Qt (non-blocking)!", this);
+    layout->addWidget(label);
+    setLayout(layout);
+}

qt_dialog.h

@@ -0,0 +1,8 @@
+#pragma once
+#include <QDialog>
+
+class QtDialog : public QDialog {
+    Q_OBJECT
+public:
+    QtDialog(QWidget* parent = nullptr);
+};