added undo button to GUI

with icons that theoretically should look ok cross-platform

src/component.py

@@ -823,7 +823,7 @@ class ComponentUpdate(QtWidgets.QUndoCommand):
     '''Command object for making a component action undoable'''
     def __init__(self, parent, oldWidgetVals, modifiedVals):
         super().__init__(
-            'Changed %s component #%s' % (
+            'change %s component #%s' % (
                 parent.name, parent.compPos
             )
         )

src/gui/actions.py

@@ -15,7 +15,7 @@ from core import Core
 class AddComponent(QUndoCommand):
     def __init__(self, parent, compI, moduleI):
         super().__init__(
-            "New %s component" %
+            "create new %s component" %
             parent.core.modules[moduleI].Component.name
         )
         self.parent = parent
@@ -39,7 +39,7 @@ class AddComponent(QUndoCommand):
 
 class RemoveComponent(QUndoCommand):
     def __init__(self, parent, selectedRows):
-        super().__init__('Remove component')
+        super().__init__('remove component')
         self.parent = parent
         componentList = self.parent.window.listWidget_componentList
         self.selectedRows = [
@@ -63,7 +63,7 @@ class RemoveComponent(QUndoCommand):
 
 class MoveComponent(QUndoCommand):
     def __init__(self, parent, row, newRow, tag):
-        super().__init__("Move component %s" % tag)
+        super().__init__("move component %s" % tag)
         self.parent = parent
         self.row = row
         self.newRow = newRow
@@ -107,7 +107,7 @@ class MoveComponent(QUndoCommand):
 
 class ClearPreset(QUndoCommand):
     def __init__(self, parent, compI):
-        super().__init__("Clear preset")
+        super().__init__("clear preset")
         self.parent = parent
         self.compI = compI
         self.component = self.parent.core.selectedComponents[compI]
@@ -125,7 +125,7 @@ class ClearPreset(QUndoCommand):
 
 class OpenPreset(QUndoCommand):
     def __init__(self, parent, presetName, compI):
-        super().__init__("Open %s preset" % presetName)
+        super().__init__("open %s preset" % presetName)
         self.parent = parent
         self.presetName = presetName
         self.compI = compI
@@ -145,7 +145,7 @@ class OpenPreset(QUndoCommand):
 
 class RenamePreset(QUndoCommand):
     def __init__(self, parent, path, oldName, newName):
-        super().__init__('Rename preset')
+        super().__init__('rename preset')
         self.parent = parent
         self.path = path
         self.oldName = oldName
@@ -167,7 +167,7 @@ class DeletePreset(QUndoCommand):
         )
         self.store = self.parent.core.getPreset(self.path)
         self.presetName = self.store['preset']
-        super().__init__('Delete %s preset (%s)' % (self.presetName, compName))
+        super().__init__('delete %s preset (%s)' % (self.presetName, compName))
         self.loadedPresets = [
             i for i, comp in enumerate(self.parent.core.selectedComponents)
             if self.presetName == str(comp.currentPreset)

src/gui/mainwindow.py

@@ -100,6 +100,42 @@ class MainWindow(QtWidgets.QMainWindow):
         self.window.installEventFilter(self)
         componentList = self.window.listWidget_componentList
 
+        style = window.pushButton_undo.style()
+        undoButton = window.pushButton_undo
+        undoButton.setIcon(
+            style.standardIcon(QtWidgets.QStyle.SP_FileDialogBack)
+        )
+        undoButton.clicked.connect(self.undoStack.undo)
+        undoButton.setEnabled(False)
+        self.undoStack.cleanChanged.connect(
+            lambda change: undoButton.setEnabled(self.undoStack.count())
+        )
+        self.undoMenu = QMenu()
+        self.undoMenu.addAction(
+            self.undoStack.createUndoAction(self)
+        )
+        self.undoMenu.addAction(
+            self.undoStack.createRedoAction(self)
+        )
+        action = self.undoMenu.addAction('Show History...')
+        action.triggered.connect(
+            lambda _: self.showUndoStack()
+        )
+        undoButton.setMenu(self.undoMenu)
+
+        style = window.pushButton_listMoveUp.style()
+        window.pushButton_listMoveUp.setIcon(
+            style.standardIcon(QtWidgets.QStyle.SP_ArrowUp)
+        )
+        style = window.pushButton_listMoveDown.style()
+        window.pushButton_listMoveDown.setIcon(
+            style.standardIcon(QtWidgets.QStyle.SP_ArrowDown)
+        )
+        style = window.pushButton_removeComponent.style()
+        window.pushButton_removeComponent.setIcon(
+            style.standardIcon(QtWidgets.QStyle.SP_DialogDiscardButton)
+        )
+
         if sys.platform == 'darwin':
             log.debug(
                 'Darwin detected: showing progress label below progress bar')

src/gui/mainwindow.ui

@@ -110,6 +110,13 @@
             <property name="sizeConstraint">
              <enum>QLayout::SetMinimumSize</enum>
             </property>
+            <item>
+             <widget class="QPushButton" name="pushButton_undo">
+              <property name="text">
+               <string>Undo</string>
+              </property>
+             </widget>
+            </item>
             <item>
              <spacer name="horizontalSpacer_6">
               <property name="orientation">