Make parameter groups collapsable

source/frontend/carla_widgets.py

@@ -33,6 +33,7 @@ import ui_carla_parameter
 
 from carla_shared import *
 from carla_utils import *
+from widgets.collapsablewidget import CollapsibleBox
 from widgets.paramspinbox import CustomInputDialog
 from widgets.pixmapkeyboard import PixmapKeyboardHArea
 
@@ -1493,8 +1494,8 @@ class PluginEdit(QDialog):
                     groupSymbol, groupName = groupName.split(":",1)
                     groupLayout, groupWidget = groupWidgets.get(groupSymbol, (None, None))
                     if groupLayout is None:
-                        groupWidget = QGroupBox(groupName, scrollAreaWidget)
-                        groupLayout = QVBoxLayout(groupWidget)
+                        groupWidget = CollapsibleBox(groupName, scrollAreaWidget)
+                        groupLayout = groupWidget.getContentLayout()
                         groupWidget.setPalette(palette2)
                         scrollAreaLayout.addWidget(groupWidget)
                         groupWidgets[groupSymbol] = (groupLayout, groupWidget)

source/frontend/widgets/collapsablewidget.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Collapsible Box, a custom Qt widget
+# Copyright (C) 2019 Filipe Coelho <falktx@falktx.com>
+#
+# This program 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 any later version.
+#
+# This program 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.
+#
+# For a full copy of the GNU General Public License see the doc/GPL.txt file.
+
+# ------------------------------------------------------------------------------------------------------------
+# Imports (Global)
+
+from PyQt5.QtCore import pyqtSlot, Qt
+from PyQt5.QtWidgets import QGroupBox, QSizePolicy, QToolButton, QVBoxLayout, QWidget
+
+# ------------------------------------------------------------------------------------------------------------
+# Widget Class
+
+class CollapsibleBox(QGroupBox):
+    def __init__(self, title, parent):
+        QGroupBox.__init__(self, parent)
+
+        self.toggle_button = QToolButton(self)
+        self.toggle_button.setText(title)
+        self.toggle_button.setCheckable(True)
+        self.toggle_button.setChecked(True)
+        self.toggle_button.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Preferred)
+        self.toggle_button.setStyleSheet("border: none;")
+        self.toggle_button.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
+        self.toggle_button.setArrowType(Qt.RightArrow)
+        self.toggle_button.toggled.connect(self.toolButtonPressed)
+
+        self.content_area   = QWidget(self)
+        self.content_layout = QVBoxLayout(self.content_area)
+        self.content_layout.setContentsMargins(0, 0, 0, 0)
+        self.content_layout.setSpacing(0)
+
+        lay = QVBoxLayout(self)
+        lay.setContentsMargins(0, 0, 0, 0)
+        lay.setSpacing(0)
+        lay.addWidget(self.toggle_button)
+        lay.addWidget(self.content_area)
+
+    @pyqtSlot(bool)
+    def toolButtonPressed(self, toggled):
+        self.content_area.setVisible(toggled)
+        self.toggle_button.setArrowType(Qt.RightArrow if toggled else Qt.DownArrow)
+
+    def getContentLayout(self):
+        return self.content_layout