check PulseAudio bridged with first group name, enable 'undo' if changes and 'save' if changes are correct. Purpose directly pertinent group add if no sink or no source exists

src/bridgesourcesink.py

@@ -21,7 +21,7 @@
 
 from collections import namedtuple
 
-from PyQt5.QtCore import Qt, QRegExp
+from PyQt5.QtCore import Qt, QRegExp, pyqtSignal
 from PyQt5.QtGui import QRegExpValidator
 from PyQt5.QtWidgets import QTableWidget, QTableWidgetItem, QHeaderView, QComboBox, QLineEdit, QSpinBox, QPushButton, QCheckBox, QHBoxLayout, QWidget
 from shared import *
@@ -61,6 +61,8 @@ class BridgeSourceSink(QTableWidget):
         channels="2",
         connected="True")
 
+    customChanged = pyqtSignal()
+
     def __init__(self, parent):
         QTableWidget.__init__(self, parent)
         self.bridgeData = []
@@ -79,7 +81,7 @@ class BridgeSourceSink(QTableWidget):
             # Name
             name_col = QLineEdit()
             name_col.setText(data.name)
-            name_col.returnPressed.connect(self.enable_buttons)
+            name_col.textChanged.connect(self.customChanged.emit)
             rx = QRegExp("[^|]+")
             validator = QRegExpValidator(rx, self)
             name_col.setValidator(validator)
@@ -100,21 +102,22 @@ class BridgeSourceSink(QTableWidget):
             combo_box.addItem(loudspeaker_icon, "sink")
             
             combo_box.setCurrentIndex(0 if data.s_type == "source" else 1)
-            combo_box.currentTextChanged.connect(self.enable_buttons)
+            combo_box.currentTextChanged.connect(self.customChanged.emit)
             self.setCellWidget(row, 1, combo_box)
 
             # Channels
             chan_col = QSpinBox()
             chan_col.setValue(int(data.channels))
             chan_col.setMinimum(1)
-            chan_col.valueChanged.connect(self.enable_buttons)
+            chan_col.setAlignment(Qt.AlignCenter)
+            chan_col.valueChanged.connect(self.customChanged.emit)
             self.setCellWidget(row, 2, chan_col)
 
             # Auto connect?
             auto_cb = QCheckBox()
             auto_cb.setObjectName("auto_cb")
             auto_cb.setCheckState(Qt.Checked if data.connected in ['true', 'True', 'TRUE'] else Qt.Unchecked)
-            auto_cb.stateChanged.connect(self.enable_buttons)
+            auto_cb.stateChanged.connect(self.customChanged.emit)
             widget = QWidget()
             h_layout = QHBoxLayout(widget)
             h_layout.addWidget(auto_cb)
@@ -124,19 +127,15 @@ class BridgeSourceSink(QTableWidget):
             self.setCellWidget(row, 3, widget)
         self.horizontalHeader().setSectionResizeMode(QHeaderView.Fixed)
 
-    def enable_buttons(self):
-        # Can't work out how to tell the table that data has changed (to cause the buttons to become enabled),
-        # so instead manually make the buttons enabled.
-        for btn_name in ["b_bridge_save", "b_bridge_undo"]:
-            self.parent().findChild(QPushButton, btn_name).setProperty("enabled", True)
-
     def defaults(self):
         self.bridgeData = [self.defaultPASourceData, self.defaultPASinkData]
         self.load_data_into_cells()
+        self.customChanged.emit()
 
     def undo(self):
         self.load_from_settings()
         self.load_data_into_cells()
+        self.customChanged.emit()
 
     def initialise_settings(self):
         GlobalSettings.setValue(
@@ -147,14 +146,91 @@ class BridgeSourceSink(QTableWidget):
         bridgeDataText = GlobalSettings.value("Pulse2JACK/PABridges")
         self.bridgeData = self.decode_bridge_data(bridgeDataText)
 
+    def hasChanges(self)->bool:
+        bridgeDataText = GlobalSettings.value("Pulse2JACK/PABridges")
+        saved_data = self.decode_bridge_data(bridgeDataText)
+
+        if self.rowCount() != len(saved_data):
+            return True
+
+        for row in range(self.rowCount()):
+            orig_data = saved_data[row]
+
+            name = self.cellWidget(row, 0).text()
+            if name != orig_data[0]:
+                return True
+
+            type = self.cellWidget(row, 1).currentText()
+            if type != orig_data[1]:
+                return True
+
+            channels = self.cellWidget(row, 2).value()
+            if channels != int(orig_data[2]):
+                return True
+
+            auto_cb = self.cellWidget(row, 3).findChild(QCheckBox, "auto_cb")
+            connected = auto_cb.isChecked()
+            if connected != bool(orig_data[3]):
+                return True
+
+        return False
+
+    def hasValidValues(self)->bool:
+        used_names = []
+
+        row_count = self.rowCount()
+        # Prevent save without any bridge
+        if not row_count:
+            return False
+
+        for row in range(row_count):
+            line_edit = self.cellWidget(row, 0)
+            name = line_edit.text()
+
+            if not name or name in used_names:
+                # prevent double name entries
+                return False
+
+            used_names.append(name)
+
+        return True
+
     def add_row(self):
-        self.bridgeData.append(SSData(name="", s_type="source", channels="2", connected="False"))
+        # first, search in table which bridge exists
+        # to add the most pertinent new bridge
+        has_source = False
+        has_sink = False
+
+        for row in range(self.rowCount()):
+            cell_widget = self.cellWidget(row, 1)
+
+            group_type = ""
+            if cell_widget:
+                group_type = cell_widget.currentText()
+
+            if group_type == "source":
+                has_source = True
+            elif group_type == "sink":
+                has_sink = True
+
+            if has_source and has_sink:
+                break
+
+        ss_data = SSData(name="", s_type="source", channels="2", connected="False")
+        if not has_sink:
+            ss_data = self.defaultPASinkData
+        elif not has_source:
+            ss_data = self.defaultPASourceData
+
+        self.bridgeData.append(ss_data)
         self.load_data_into_cells()
         self.editItem(self.item(self.rowCount() - 1, 0))
+        self.customChanged.emit()
 
     def remove_row(self):
         del self.bridgeData[self.currentRow()]
         self.load_data_into_cells()
+        self.customChanged.emit()
 
     def save_bridges(self):
         self.bridgeData = []
@@ -177,6 +253,7 @@ class BridgeSourceSink(QTableWidget):
         # Need an extra line at the end
         conn_file.write("\n")
         conn_file.close()
+        self.customChanged.emit()
 
     # encode and decode from tuple so it isn't stored in the settings file as a type, and thus the
     # configuration is backwards compatible with versions that don't understand SSData types.

src/cadence.py

@@ -1139,7 +1139,7 @@ class CadenceMainW(QMainWindow, ui_cadence.Ui_CadenceMainW):
         self.b_bridge_undo.clicked.connect(self.slot_PulseAudioBridgeUndo)
         self.b_bridge_save.clicked.connect(self.slot_PulseAudioBridgeSave)
         self.b_bridge_defaults.clicked.connect(self.slot_PulseAudioBridgeDefaults)
-        self.tableSinkSourceData.itemChanged.connect(self.slot_PulseAudioBridgeTableChanged)
+        self.tableSinkSourceData.customChanged.connect(self.slot_PulseAudioBridgeTableChanged)
         self.tableSinkSourceData.doubleClicked.connect(self.slot_PulseAudioBridgeTableChanged)
 
         self.pic_catia.clicked.connect(self.func_start_catia)
@@ -1236,11 +1236,13 @@ class CadenceMainW(QMainWindow, ui_cadence.Ui_CadenceMainW):
                 except:
                     version, groups, conns = (list(), list(), list())
 
+                pa_first_group_name = self.getFirstPulseAudioGroupName()
+
                 for group_id, group_name, ports in groups:
                     if group_name == "alsa2jack":
                         global jackClientIdALSA
                         jackClientIdALSA = group_id
-                    elif group_name == "PulseAudio JACK Sink":
+                    elif group_name in (pa_first_group_name, "PulseAudio JACK Sink"):
                         global jackClientIdPulse
                         jackClientIdPulse = group_id
 
@@ -1415,6 +1417,14 @@ class CadenceMainW(QMainWindow, ui_cadence.Ui_CadenceMainW):
         self.systray.setActionEnabled("a2j_stop", False)
         self.label_bridge_a2j.setText(self.tr("ALSA MIDI Bridge is stopped"))
 
+    def getFirstPulseAudioGroupName(self)->str:
+        # search PulseAudio JACK first group in settings
+        pa_bridges_settings = GlobalSettings.value("Pulse2JACK/PABridges", type=list)
+        if pa_bridges_settings:
+            return pa_bridges_settings[0].partition('|')[0]
+
+        return "PulseAudio JACK Sink"
+
     def checkAlsaAudio(self):
         asoundrcFile = os.path.join(HOME, ".asoundrc")
 
@@ -1626,11 +1636,13 @@ class CadenceMainW(QMainWindow, ui_cadence.Ui_CadenceMainW):
 
     @pyqtSlot(int, str)
     def slot_DBusJackClientAppearedCallback(self, group_id, group_name):
+        pa_first_group_name = self.getFirstPulseAudioGroupName()
+
         if group_name == "alsa2jack":
             global jackClientIdALSA
             jackClientIdALSA = group_id
             self.checkAlsaAudio()
-        elif group_name == "PulseAudio JACK Sink":
+        elif group_name in ("PulseAudio JACK Sink", pa_first_group_name):
             global jackClientIdPulse
             jackClientIdPulse = group_id
             self.checkPulseAudio()
@@ -1809,38 +1821,30 @@ class CadenceMainW(QMainWindow, ui_cadence.Ui_CadenceMainW):
 
     @pyqtSlot()
     def slot_PulseAudioBridgeTableChanged(self):
-        self.b_bridge_save.setEnabled(True)
-        self.b_bridge_undo.setEnabled(True)
+        has_changes = self.tableSinkSourceData.hasChanges()
+        has_valid_values = self.tableSinkSourceData.hasValidValues()
+        self.b_bridge_save.setEnabled(has_changes and has_valid_values)
+        self.b_bridge_undo.setEnabled(has_changes)
 
     @pyqtSlot()
     def slot_PulseAudioBridgeAdd(self):
         self.tableSinkSourceData.add_row()
-        self.b_bridge_save.setEnabled(True)
-        self.b_bridge_undo.setEnabled(True)
 
     @pyqtSlot()
     def slot_PulseAudioBridgeRemove(self):
         self.tableSinkSourceData.remove_row()
-        self.b_bridge_save.setEnabled(True)
-        self.b_bridge_undo.setEnabled(True)
 
     @pyqtSlot()
     def slot_PulseAudioBridgeUndo(self):
         self.tableSinkSourceData.undo()
-        self.b_bridge_save.setEnabled(False)
-        self.b_bridge_undo.setEnabled(False)
 
     @pyqtSlot()
     def slot_PulseAudioBridgeSave(self):
         self.tableSinkSourceData.save_bridges()
-        self.b_bridge_save.setEnabled(False)
-        self.b_bridge_undo.setEnabled(False)
 
     @pyqtSlot()
     def slot_PulseAudioBridgeDefaults(self):
         self.tableSinkSourceData.defaults()
-        self.b_bridge_save.setEnabled(True)
-        self.b_bridge_undo.setEnabled(True)
 
     @pyqtSlot()
     def slot_PulseAudioBridgeOptions(self):