allow to empty shortcuts; allow 'space' to be used as shortcut

openlp/core/ui/shortcutlistdialog.py

@@ -28,6 +28,25 @@ from PyQt4 import QtCore, QtGui
 
 from openlp.core.lib import translate, build_icon
 
+class CaptureShortcutButton(QtGui.QPushButton):
+    """
+    A class to encapsulate a ``QPushButton``.
+    """
+    def __init__(self, *args):
+        QtGui.QPushButton.__init__(self, *args)
+        self.setCheckable(True)
+
+    def keyPressEvent(self, event):
+        """
+        Block the ``Key_Space`` key, so that the button will not change the
+        checked state.
+        """
+        if event.key() == QtCore.Qt.Key_Space and self.isChecked():
+            event.ignore()
+        else:
+            self.setChecked(True)
+
+
 class Ui_ShortcutListDialog(object):
     def setupUi(self, shortcutListDialog):
         shortcutListDialog.setObjectName(u'shortcutListDialog')
@@ -56,12 +75,11 @@ class Ui_ShortcutListDialog(object):
         self.detailsLayout.addWidget(self.customRadioButton, 1, 0, 1, 1)
         self.primaryLayout = QtGui.QHBoxLayout()
         self.primaryLayout.setObjectName(u'primaryLayout')
-        self.primaryPushButton = QtGui.QPushButton(shortcutListDialog)
+        self.primaryPushButton = CaptureShortcutButton(shortcutListDialog)
         self.primaryPushButton.setObjectName(u'primaryPushButton')
         self.primaryPushButton.setMinimumSize(QtCore.QSize(84, 0))
         self.primaryPushButton.setIcon(
             build_icon(u':/system/system_configure_shortcuts.png'))
-        self.primaryPushButton.setCheckable(True)
         self.primaryLayout.addWidget(self.primaryPushButton)
         self.clearPrimaryButton = QtGui.QToolButton(shortcutListDialog)
         self.clearPrimaryButton.setObjectName(u'clearPrimaryButton')
@@ -72,9 +90,8 @@ class Ui_ShortcutListDialog(object):
         self.detailsLayout.addLayout(self.primaryLayout, 1, 1, 1, 1)
         self.alternateLayout = QtGui.QHBoxLayout()
         self.alternateLayout.setObjectName(u'alternateLayout')
-        self.alternatePushButton = QtGui.QPushButton(shortcutListDialog)
+        self.alternatePushButton = CaptureShortcutButton(shortcutListDialog)
         self.alternatePushButton.setObjectName(u'alternatePushButton')
-        self.alternatePushButton.setCheckable(True)
         self.alternatePushButton.setIcon(
             build_icon(u':/system/system_configure_shortcuts.png'))
         self.alternateLayout.addWidget(self.alternatePushButton)

openlp/core/ui/shortcutlistform.py

@@ -71,7 +71,9 @@ class ShortcutListForm(QtGui.QDialog, Ui_ShortcutListDialog):
             QtCore.SIGNAL(u'clicked(bool)'), self.onCustomRadioButtonClicked)
 
     def keyPressEvent(self, event):
-        if self.primaryPushButton.isChecked() or \
+        if event.key() == QtCore.Qt.Key_Space:
+            self.keyReleaseEvent(event)
+        elif self.primaryPushButton.isChecked() or \
             self.alternatePushButton.isChecked():
             event.ignore()
         elif event.key() == QtCore.Qt.Key_Escape:
@@ -163,6 +165,7 @@ class ShortcutListForm(QtGui.QDialog, Ui_ShortcutListDialog):
         self.customRadioButton.setChecked(True)
         if toggled:
             self.alternatePushButton.setChecked(False)
+            self.primaryPushButton.setText(u'')
             return
         action = self._currentItemAction()
         if action is None:
@@ -181,6 +184,7 @@ class ShortcutListForm(QtGui.QDialog, Ui_ShortcutListDialog):
         self.customRadioButton.setChecked(True)
         if toggled:
             self.primaryPushButton.setChecked(False)
+            self.alternatePushButton.setText(u'')
             return
         action = self._currentItemAction()
         if action is None:
@@ -211,10 +215,11 @@ class ShortcutListForm(QtGui.QDialog, Ui_ShortcutListDialog):
         self.primaryPushButton.setChecked(column in [0, 1])
         self.alternatePushButton.setChecked(column not in [0, 1])
         if column in [0, 1]:
+            self.primaryPushButton.setText(u'')
             self.primaryPushButton.setFocus(QtCore.Qt.OtherFocusReason)
         else:
+            self.alternatePushButton.setText(u'')
             self.alternatePushButton.setFocus(QtCore.Qt.OtherFocusReason)
-        self.onCurrentItemChanged(item)
 
     def onCurrentItemChanged(self, item=None, previousItem=None):
         """
@@ -247,6 +252,12 @@ class ShortcutListForm(QtGui.QDialog, Ui_ShortcutListDialog):
             elif len(shortcuts) == 2:
                 primary_text = shortcuts[0].toString()
                 alternate_text = shortcuts[1].toString()
+        # When we are capturing a new shortcut, we do not want, that the buttons
+        # display the current shortcut.
+        if self.primaryPushButton.isChecked():
+            primary_text = u''
+        if self.alternatePushButton.isChecked():
+            alternate_text = u''
         self.primaryPushButton.setText(primary_text)
         self.alternatePushButton.setText(alternate_text)
         self.primaryLabel.setText(primary_label_text)