give feedback on which buttons are held down at the top of the button

remapping tab

src/ui.cc

@@ -257,7 +257,10 @@ void MainWin::updateui()
 
 void MainWin::spnav_input()
 {
+	static unsigned char bnstate[MAX_BUTTONS];
 	static int maxval = 256;
+	char bnstr[MAX_BUTTONS * 4 + 20];
+	char *endp;
 	spnav_event ev;
 	QLabel *lb;
 	QPalette cmap;
@@ -281,12 +284,23 @@ void MainWin::spnav_input()
 			lb = bnrow[ev.button.bnum].lb_bidx;
 
 			if(ev.button.press) {
+				bnstate[ev.button.bnum] = 1;
 				def_cmap = cmap = lb->palette();
 				cmap.setColor(QPalette::WindowText, Qt::red);
 				lb->setPalette(cmap);
 			} else {
+				bnstate[ev.button.bnum] = 0;
 				lb->setPalette(def_cmap);
 			}
+
+			strcpy(bnstr, "Buttons pressed:");
+			endp = bnstr + strlen(bnstr);
+			for(int i=0; i<devinfo.nbuttons; i++) {
+				if(bnstate[i]) {
+					endp += sprintf(endp, " %02d", i);
+				}
+			}
+			ui->lb_bnstate->setText(bnstr);
 			break;
 
 		case SPNAV_EVENT_CFG:

ui/spnavcfg.ui

@@ -914,6 +914,13 @@
        <string>Buttons</string>
       </attribute>
       <layout class="QVBoxLayout" name="verticalLayout_4">
+       <item>
+        <widget class="QLabel" name="lb_bnstate">
+         <property name="text">
+          <string>Buttons pressed:</string>
+         </property>
+        </widget>
+       </item>
        <item>
         <widget class="QScrollArea" name="scroll_area_buttons">
          <property name="widgetResizable">
@@ -925,7 +932,7 @@
             <x>0</x>
             <y>0</y>
             <width>758</width>
-            <height>378</height>
+            <height>355</height>
            </rect>
           </property>
          </widget>