Using Qt Main Window Classes

The next step is to use the new Main Window in our application. The changes needed in todo.cpp are large due to the large amount of code being removed.

First, we add the include for our new Main Window.

    #include "mainwindow.h"

We can cleanup the Motif includes, since many of them are no longer needed.

    #include <Xm/Xm.h>
    #include <Xm/Label.h>
    #include <Xm/Notebook.h>
    #include <Xm/Text.h>

    #include <Xmd/Print.h>

    #include "page.h"

The QuitAppl() and manageCB() callbacks are not needed any more, so we remove them. We do not need the global shell variable either. We remove it and all references to it in the New(), Save() and Open() callbacks.

In main(), we make the large changes. First, we use our new MainWindow instead of QMotifWidget with XmMainWindow.

      QMotif integrator( APP_CLASS, NULL,
                         optionDesc, XtNumber(optionDesc) );
      QApplication app( argc, argv );
      MainWindow mainwindow;
      app.setMainWidget( &mainwindow );

We will now use QMotifWidget to create the XmNotebook widget.

      n = 0;
      XtSetArg(args[n], XmNcurrentPageNumber, 1); n++;
      XtSetArg(args[n], XmNlastPageNumber, 100); n++;

      QMotifWidget *center =
          new QMotifWidget( &mainwindow, xmNotebookWidgetClass,
                            args, n, "notebook" );
      mainwindow.setCentralWidget( center );
      notebook = center->motifWidget();

We remove all of the code used to create the Motif menus. The remaining code in main() is self-explanatory.

      XtAddCallback(notebook, XmNpageChangedCallback,
                    (XtCallbackProc) PageChange, NULL);

      n = 0;
      XtSetArg(args[n], XmNpageNumber, 1); n++;
      XtSetArg(args[n], XmNeditMode, XmMULTI_LINE_EDIT); n++;
      textw = XmCreateScrolledText(notebook, "text", args, n);
      XtManageChild(textw);
      XtAddCallback(textw, XmNvalueChangedCallback,
                    (XtCallbackProc) TextChanged, NULL);

      n = 0;
      XtSetArg(args[n], XmNnotebookChildType, XmSTATUS_AREA); n++;
      XtSetArg(args[n], XmNpageNumber, 1); n++;
      labelw = XmCreateLabel(notebook, "label", args, n);
      XtManageChild(labelw);

      user = getpwuid(getuid());
      for (i = 0; i < MAXPAGES; i++) {
        pages[i] = NULL;
      }

      if (options.todoFile == NULL) {
        strcpy(temppath, user -> pw_dir);
        strcat(temppath, "/.todo");
        options.todoFile = XtNewString(temppath);
      } else {
        /* Copy the string for consistency */
        options.todoFile = XtNewString(options.todoFile);
      }

      ReadDB(options.todoFile);
      SetPage(0);

      mainwindow.show();
      return app.exec();
    }

Our application is now using QMainWindow instead of XmMainWindow. After we build the project, the application runs and operates as expected.

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