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unix/tx/TXDialog.h

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+/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+//
+// TXDialog.h
+//
+// A TXDialog is a pop-up dialog window.  The dialog can be made visible by
+// calling its show() method.  Dialogs can be modal or non-modal.  For a modal
+// dialog box, the show() method only returns when the dialog box has been
+// dismissed.  For a non-modal dialog box, the show() method returns
+// immediately.
+//
+
+#ifndef __TXDIALOG_H__
+#define __TXDIALOG_H__
+
+#include "TXWindow.h"
+#include <errno.h>
+
+class TXDialog : public TXWindow, public TXDeleteWindowCallback {
+public:
+  TXDialog(Display* dpy, int width, int height, const char* name,
+           bool modal_=false)
+    : TXWindow(dpy, width, height), done(false), ok(false), modal(modal_)
+  {
+    toplevel(name, this);
+    resize(width, height);
+  }
+
+  virtual ~TXDialog() {}
+
+  // show() makes the dialog visible.  For a modal dialog box, this processes X
+  // events until the done flag has been set, after which it returns the value
+  // of the ok flag.  For a non-modal dialog box it always returns true
+  // immediately.
+  bool show() {
+    ok = false;
+    done = false;
+    initDialog();
+    raise();
+    map();
+    if (modal) {
+      while (true) {
+        TXWindow::handleXEvents(dpy);
+        if (done) {
+          return ok;
+        }
+        fd_set rfds;
+        FD_ZERO(&rfds);
+        FD_SET(ConnectionNumber(dpy), &rfds);
+        int n = select(FD_SETSIZE, &rfds, 0, 0, 0);
+        if (n < 0) throw rdr::SystemException("select",errno);
+      }
+    }
+    return true;
+  }
+
+  // initDialog() can be overridden in a derived class.  Typically it is used
+  // to make sure that checkboxes have the right state, etc.
+  virtual void initDialog() {}
+
+  // resize() is overridden here to re-center the dialog
+  void resize(int w, int h) {
+    TXWindow::resize(w,h);
+    int dpyWidth = WidthOfScreen(DefaultScreenOfDisplay(dpy));
+    int dpyHeight = HeightOfScreen(DefaultScreenOfDisplay(dpy));
+    setUSPosition((dpyWidth - width() - 10) / 2, (dpyHeight - height() - 30) / 2);
+  }    
+
+protected:
+  virtual void deleteWindow(TXWindow* w) {
+    ok = false;
+    done = true;
+    unmap();
+  }
+
+  bool done;
+  bool ok;
+  bool modal;
+};
+
+#endif