Initial import of the CDE 2.1.30 sources from the Open Group.

cde/examples/dtsession/session.c

@@ -0,0 +1,214 @@
+/* $XConsortium: session.c /main/3 1995/10/27 10:40:33 rswiston $ */
+/*
+ * (c) Copyright 1993, 1994 Hewlett-Packard Company	
+ * (c) Copyright 1993, 1994 International Business Machines Corp.
+ * (c) Copyright 1993, 1994 Sun Microsystems, Inc.
+ * (c) Copyright 1993, 1994 Novell, Inc.
+ */
+
+
+/*
+ * session.c
+ *
+ * Example code for Dt Session Manager conventions and API
+ */
+
+#include <stdio.h>
+#include <Xm/RowColumn.h>
+#include <Xm/ToggleB.h>
+#include <Xm/Protocols.h>
+#include <Dt/Session.h>
+
+
+/*
+ * Define '-session' command line option
+ */
+
+typedef struct _ApplicationArgs {
+	String session;
+} ApplicationArgs;
+
+static XtResource applicationResources[] = {
+	{
+	"session",
+	"Session",
+	XmRString,
+	sizeof(String),
+	XtOffsetOf(ApplicationArgs,session),
+	XmRImmediate,
+	NULL
+	},
+};
+
+static XrmOptionDescRec commandLineOpts[] = {
+	{ "-session", "session", XrmoptionSepArg, NULL },
+};
+
+static ApplicationArgs applicationArgs;
+
+/*
+ * Simple application state to be preserved across sessions
+ */
+
+static int lightState = False;
+
+/*
+ * miscellaneous global data
+ */
+
+static XtAppContext appContext;
+static Widget toplevel;
+static int savedArgc;
+static char **savedArgv;
+
+static void PreserveCommandLine(int, char **);
+static void SetWmCommand(char *);
+static void SaveSessionCb(Widget, XtPointer, XtPointer);
+static void RestoreSession(Widget, char*);
+static void SaveApplicationState(char *);
+static void RestoreApplicationState(char *);
+
+
+main(int argc, char **argv)
+{
+    Widget mainWindow, toggle;
+    XmString labelString;
+    Arg args[1];
+    
+    /* Save the command line before Xt parses out the standard options */
+    PreserveCommandLine(argc, argv);
+
+    /* Create the application UI */
+
+    toplevel = XtAppInitialize(&appContext, "Session",
+				commandLineOpts, XtNumber(commandLineOpts),
+				&argc, argv,
+				NULL,
+				NULL, 0);
+
+    XtGetApplicationResources(toplevel, &applicationArgs,
+				applicationResources,
+				XtNumber(applicationResources),
+				NULL, 0);
+
+    mainWindow = XmCreateWorkArea(toplevel, "mainWindow", NULL, 0);
+    XtManageChild(mainWindow);
+
+    labelString = XmStringCreateLocalized("Lights");
+    XtSetArg(args[0], XmNlabelString, labelString);
+    toggle = XmCreateToggleButton(mainWindow, "lightsToggle", args, 1);
+    XtManageChild(toggle);
+    XmStringFree(labelString);
+
+    /* Add callback to detect session manager messages */
+
+    XmAddWMProtocolCallback(toplevel,
+		XInternAtom(XtDisplay(toplevel), "WM_SAVE_YOURSELF", False),
+		SaveSessionCb, (XtPointer)toplevel);
+
+    /* Restore state if application was restarted by session manager */
+
+    if (applicationArgs.session != NULL) {
+	RestoreSession(toplevel, applicationArgs.session);
+    }
+
+    XtRealizeWidget(toplevel);
+    XtAppMainLoop(appContext);
+}
+
+
+/*
+ * Save session state
+ */
+
+static void SaveSessionCb(Widget w, XtPointer cd, XtPointer cb)
+{
+    Widget toplevel = (Widget)cd;
+    char *savePath = NULL;
+    char *saveFile = NULL;
+
+    DtSessionSavePath(toplevel, &savePath, &saveFile);
+
+    if (savePath != NULL) {
+	SaveApplicationState(savePath);
+	SetWmCommand(saveFile);
+	XtFree(savePath);
+	XtFree(saveFile);
+    }
+}
+
+static void SaveApplicationState(char *path)
+{
+    Widget toggle = XtNameToWidget(toplevel, "*lightsToggle");
+    FILE *fp;
+
+    lightState = XmToggleButtonGetState(toggle);
+
+    if ((fp = fopen(path, "w")) != NULL) {
+	fprintf(fp, "%d", lightState);
+	fclose(fp);
+    }
+}
+
+static void PreserveCommandLine(int argc, char **argv)
+{
+    int i;
+
+    savedArgv = (char **)XtMalloc(argc*sizeof(char *));
+    savedArgc = argc;
+    for (i=0; i < argc; i++) savedArgv[i] = XtNewString(argv[i]);
+}
+
+
+static void SetWmCommand(char *sessionId)
+{
+    char **wm_command;
+    int i, j;
+
+    wm_command = (char **) XtMalloc((savedArgc+2) * sizeof(char*));
+    wm_command[0] = XtNewString(savedArgv[0]);
+    wm_command[1] = XtNewString("-session");
+    wm_command[2] = XtNewString(sessionId);
+
+    for (i = 1, j = 3; i < savedArgc; i++) {
+	    if (strcmp(savedArgv[i], "-session") == 0) { i++; continue; }
+	    wm_command[j] = XtNewString(savedArgv[i]);
+	    j++;
+    }
+
+    XSetCommand(XtDisplay(toplevel), XtWindow(toplevel), wm_command, j);
+
+    for (i=0; i < j; i++) XtFree(wm_command[i]);
+    XtFree((char*)wm_command);
+}
+
+/*
+ * Restore previously saved state
+ */
+
+static void RestoreSession(Widget w, char *restoreFile)
+{
+    char *restorePath = NULL;
+
+    DtSessionRestorePath(w, &restorePath, restoreFile);
+
+    if (restorePath != NULL) {
+	RestoreApplicationState(restorePath);
+	XtFree(restorePath);
+    }
+}
+
+static void RestoreApplicationState(char *path)
+{
+    Widget toggle = XtNameToWidget(toplevel, "*lightsToggle");
+    FILE *fp;
+
+    if ((fp = fopen(path, "r")) != NULL) {
+	fscanf(fp, "%d", &lightState);
+	fclose(fp);
+    }
+
+    XmToggleButtonSetState(toggle, lightState, False);
+}
+
+