diff --git a/src/declarativeimports/core/theme.h b/src/declarativeimports/core/theme.h
index 81027716a..90b753611 100644
--- a/src/declarativeimports/core/theme.h
+++ b/src/declarativeimports/core/theme.h
@@ -96,7 +96,7 @@ public:
     /**
      * @return The size of an uppercase M in a font, defaultFont() by default
      */
-    QSizeF mSize(const QFont &font = QApplication::font()) const;
+    Q_INVOKABLE QSizeF mSize(const QFont &font = QApplication::font()) const;
 
     bool windowTranslucencyEnabled() const;
     KUrl homepage() const;
diff --git a/src/declarativeimports/plasmacomponents/platformcomponents/touch/Menu.qml b/src/declarativeimports/plasmacomponents/platformcomponents/touch/Menu.qml
index 699c78b5e..38dc2c4dc 100644
--- a/src/declarativeimports/plasmacomponents/platformcomponents/touch/Menu.qml
+++ b/src/declarativeimports/plasmacomponents/platformcomponents/touch/Menu.qml
@@ -96,8 +96,8 @@ Item {
         mainItem: Item {
             id: contentItem
 
-            width: Math.max(menuColumn.width, theme.defaultFont.mSize.width * 12)
-            height: Math.min(menuColumn.height, theme.defaultFont.mSize.height * 25)
+            width: Math.max(menuColumn.width, theme.mSize(theme.defaultFont).width * 12)
+            height: Math.min(menuColumn.height, theme.mSize(theme.defaultFont).height * 25)
 
 
 
diff --git a/src/declarativeimports/plasmacomponents/platformcomponents/touch/TextField.qml b/src/declarativeimports/plasmacomponents/platformcomponents/touch/TextField.qml
index 5d01b1971..966fbd4bf 100644
--- a/src/declarativeimports/plasmacomponents/platformcomponents/touch/TextField.qml
+++ b/src/declarativeimports/plasmacomponents/platformcomponents/touch/TextField.qml
@@ -91,8 +91,8 @@ Item {
     property alias activeFocus: textInput.activeFocus
 
     // TODO: fix default size
-    implicitWidth: theme.defaultFont.mSize.width*12
-    implicitHeight: theme.defaultFont.mSize.height*1.6
+    implicitWidth: theme.mSize(theme.defaultFont).width*12
+    implicitHeight: theme.mSize(theme.defaultFont).height*1.6
     // TODO: needs to define if there will be specific graphics for
     //     disabled text fields
     opacity: enabled ? 1.0 : 0.5
diff --git a/src/declarativeimports/plasmacomponents/qml/Button.qml b/src/declarativeimports/plasmacomponents/qml/Button.qml
index 56e07d428..c960c0de6 100644
--- a/src/declarativeimports/plasmacomponents/qml/Button.qml
+++ b/src/declarativeimports/plasmacomponents/qml/Button.qml
@@ -110,11 +110,11 @@ Item {
         if (label.text.length == 0) {
             height;
         } else {
-            Math.max(theme.defaultFont.mSize.width*12, minimumWidth);
+            Math.max(theme.mSize(theme.defaultFont).width*12, minimumWidth);
         }
     }
 
-    implicitHeight: Math.max(theme.defaultFont.mSize.height*1.6, minimumHeight)
+    implicitHeight: Math.max(theme.mSize(theme.defaultFont).height*1.6, minimumHeight)
 
     // TODO: needs to define if there will be specific graphics for
     //     disabled buttons
diff --git a/src/declarativeimports/plasmacomponents/qml/CheckBox.qml b/src/declarativeimports/plasmacomponents/qml/CheckBox.qml
index 0ac902bfb..318b63c20 100644
--- a/src/declarativeimports/plasmacomponents/qml/CheckBox.qml
+++ b/src/declarativeimports/plasmacomponents/qml/CheckBox.qml
@@ -39,8 +39,8 @@ Private.DualStateButton {
     view: PlasmaCore.FrameSvgItem {
         imagePath: "widgets/button"
         prefix: "normal"
-        width: theme.defaultFont.mSize.height + margins.left
-        height: theme.defaultFont.mSize.height + margins.top
+        width: theme.mSize(theme.defaultFont).height + margins.left
+        height: theme.mSize(theme.defaultFont).height + margins.top
 
         PlasmaCore.SvgItem {
             svg: PlasmaCore.Svg {
diff --git a/src/declarativeimports/plasmacomponents/qml/Dialog.qml b/src/declarativeimports/plasmacomponents/qml/Dialog.qml
index 0f2ace5e4..93edf26bf 100644
--- a/src/declarativeimports/plasmacomponents/qml/Dialog.qml
+++ b/src/declarativeimports/plasmacomponents/qml/Dialog.qml
@@ -293,7 +293,7 @@ Item {
 
     Item {
         id: dialogLayout
-        width: Math.max(buttonItem.childrenRect.width,  Math.min(contentItem.childrenRect.width, theme.defaultFont.mSize.width * 30))
+        width: Math.max(buttonItem.childrenRect.width,  Math.min(contentItem.childrenRect.width, theme.mSize(theme.defaultFont).width * 30))
         height: titleBar.height + contentItem.childrenRect.height + buttonItem.childrenRect.height + 10
 
         parent: internalLoader.dialog ? internalLoader.dialog : internalLoader.inlineDialog
diff --git a/src/declarativeimports/plasmacomponents/qml/Label.qml b/src/declarativeimports/plasmacomponents/qml/Label.qml
index 1d80d7855..9d65bb49f 100644
--- a/src/declarativeimports/plasmacomponents/qml/Label.qml
+++ b/src/declarativeimports/plasmacomponents/qml/Label.qml
@@ -33,7 +33,7 @@ import org.kde.plasma.core 0.1 as PlasmaCore
 Text {
     id: root
 
-    height: Math.max(paintedHeight, theme.defaultFont.mSize.height*1.6)
+    height: Math.max(paintedHeight, theme.mSize(theme.defaultFont).height*1.6)
     verticalAlignment: lineCount > 1 ? Text.AlignTop : Text.AlignVCenter
 
     font.capitalization: theme.defaultFont.capitalization
diff --git a/src/declarativeimports/plasmacomponents/qml/QueryDialog.qml b/src/declarativeimports/plasmacomponents/qml/QueryDialog.qml
index 42630487a..98c705e80 100644
--- a/src/declarativeimports/plasmacomponents/qml/QueryDialog.qml
+++ b/src/declarativeimports/plasmacomponents/qml/QueryDialog.qml
@@ -64,9 +64,9 @@ PlasmaComponents.CommonDialog {
     }
 
     content: Item {
-        implicitWidth: Math.max(theme.defaultFont.mSize.width * 15,  Math.min(label.implicitWidth+12, theme.defaultFont.mSize.width * 25))
+        implicitWidth: Math.max(theme.mSize(theme.defaultFont).width * 15,  Math.min(label.implicitWidth+12, theme.mSize(theme.defaultFont).width * 25))
 
-        implicitHeight: Math.min(theme.defaultFont.mSize.height * 12, label.paintedHeight + 6)
+        implicitHeight: Math.min(theme.mSize(theme.defaultFont).height * 12, label.paintedHeight + 6)
 
 
         width: implicitWidth
diff --git a/src/declarativeimports/plasmacomponents/qml/RadioButton.qml b/src/declarativeimports/plasmacomponents/qml/RadioButton.qml
index b1da4028e..fbe87b68e 100644
--- a/src/declarativeimports/plasmacomponents/qml/RadioButton.qml
+++ b/src/declarativeimports/plasmacomponents/qml/RadioButton.qml
@@ -39,7 +39,7 @@ Private.DualStateButton {
             imagePath: "widgets/actionbutton"
         }
         elementId: "normal"
-        width: theme.defaultFont.mSize.height + 6
+        width: theme.mSize(theme.defaultFont).height + 6
         height: width
 
         PlasmaCore.SvgItem {
diff --git a/src/declarativeimports/plasmacomponents/qml/SelectionDialog.qml b/src/declarativeimports/plasmacomponents/qml/SelectionDialog.qml
index 95a3f51d4..c29ad9ba1 100644
--- a/src/declarativeimports/plasmacomponents/qml/SelectionDialog.qml
+++ b/src/declarativeimports/plasmacomponents/qml/SelectionDialog.qml
@@ -100,8 +100,8 @@ PlasmaComponents.CommonDialog {
     content: Item {
         id: contentItem
         property alias filterText: filterField.filterText
-        implicitWidth: theme.defaultFont.mSize.width * 40
-        implicitHeight: theme.defaultFont.mSize.height * 12
+        implicitWidth: theme.mSize(theme.defaultFont).width * 40
+        implicitHeight: theme.mSize(theme.defaultFont).height * 12
         height: implicitHeight
 
         TextField {
diff --git a/src/declarativeimports/plasmacomponents/qml/Sheet.qml b/src/declarativeimports/plasmacomponents/qml/Sheet.qml
index ca74e6a40..0e256824b 100644
--- a/src/declarativeimports/plasmacomponents/qml/Sheet.qml
+++ b/src/declarativeimports/plasmacomponents/qml/Sheet.qml
@@ -193,8 +193,8 @@ Item {
 
         mainItem: Item {
             id: mainItem
-            width: theme.defaultFont.mSize.width * 40
-            height: Math.max(titleBar.childrenRect.height + contentItem.childrenRect.height + buttonsRow.childrenRect.height + 8, theme.defaultFont.mSize.height * 25)
+            width: theme.mSize(theme.defaultFont).width * 40
+            height: Math.max(titleBar.childrenRect.height + contentItem.childrenRect.height + buttonsRow.childrenRect.height + 8, theme.mSize(theme.defaultFont).height * 25)
 
             // Consume all key events that are not processed by children
             Keys.onPressed: event.accepted = true
@@ -263,7 +263,7 @@ Item {
                     bottom: parent.bottom
                     horizontalCenter: parent.horizontalCenter
                     //the bottom margin is disabled but we want it anyways
-                    bottomMargin: theme.defaultFont.mSize.height*0.6
+                    bottomMargin: theme.mSize(theme.defaultFont).height*0.6
                 }
 
                 PlasmaComponents.Button {
diff --git a/src/declarativeimports/plasmacomponents/qml/Slider.qml b/src/declarativeimports/plasmacomponents/qml/Slider.qml
index b1db3d55f..1e1a109c7 100644
--- a/src/declarativeimports/plasmacomponents/qml/Slider.qml
+++ b/src/declarativeimports/plasmacomponents/qml/Slider.qml
@@ -104,8 +104,8 @@ Item {
      */
     property alias inverted: range.inverted
 
-    width: contents.isVertical ? theme.defaultFont.mSize.height*1.6 : 200
-    height: contents.isVertical ? 200 : theme.defaultFont.mSize.height*1.6
+    width: contents.isVertical ? theme.mSize(theme.defaultFont).height*1.6 : 200
+    height: contents.isVertical ? 200 : theme.mSize(theme.defaultFont).height*1.6
     // TODO: needs to define if there will be specific graphics for
     //     disabled sliders
     opacity: enabled ? 1.0 : 0.5
diff --git a/src/declarativeimports/plasmacomponents/qml/Switch.qml b/src/declarativeimports/plasmacomponents/qml/Switch.qml
index d4630f92d..2743f529e 100644
--- a/src/declarativeimports/plasmacomponents/qml/Switch.qml
+++ b/src/declarativeimports/plasmacomponents/qml/Switch.qml
@@ -39,7 +39,7 @@ Private.DualStateButton {
         imagePath: "widgets/slider"
         prefix: "groove"
         width: height * 2
-        height: Math.max(theme.defaultFont.mSize.height + margins.top + margins.bottom,
+        height: Math.max(theme.mSize(theme.defaultFont).height + margins.top + margins.bottom,
                          button.margins.top + button.margins.bottom)
 
         PlasmaCore.FrameSvgItem {
diff --git a/src/declarativeimports/plasmacomponents/qml/TabBar.qml b/src/declarativeimports/plasmacomponents/qml/TabBar.qml
index 85ef14da3..8a3f70074 100644
--- a/src/declarativeimports/plasmacomponents/qml/TabBar.qml
+++ b/src/declarativeimports/plasmacomponents/qml/TabBar.qml
@@ -161,7 +161,7 @@ FocusScope {
         Private.TabBarLayout {
             id: tabBarLayout
             //A bit of snap before scrolling the layout
-            width: (implicitWidth - parent.width < theme.defaultFont.mSize.width*4) ? parent.width : implicitWidth
+            width: (implicitWidth - parent.width < theme.mSize(theme.defaultFont).width*4) ? parent.width : implicitWidth
             anchors {
                 top: parent.top
                 bottom: parent.bottom
diff --git a/src/declarativeimports/plasmacomponents/qml/TabButton.qml b/src/declarativeimports/plasmacomponents/qml/TabButton.qml
index 062530f2c..8a00edb93 100644
--- a/src/declarativeimports/plasmacomponents/qml/TabButton.qml
+++ b/src/declarativeimports/plasmacomponents/qml/TabButton.qml
@@ -137,7 +137,7 @@ Item {
         anchors {
             top: internal.portrait && iconSource != null ? imageLoader.bottom : parent.top
             left: internal.portrait || iconSource == null ? parent.left : imageLoader.right
-            leftMargin: iconSource == null ? 0 : theme.defaultFont.mSize.width
+            leftMargin: iconSource == null ? 0 : theme.mSize(theme.defaultFont).width
             right: parent.right
             bottom: parent.bottom
         }
diff --git a/src/declarativeimports/plasmacomponents/qml/TextField.qml b/src/declarativeimports/plasmacomponents/qml/TextField.qml
index e790eadad..b581cf680 100644
--- a/src/declarativeimports/plasmacomponents/qml/TextField.qml
+++ b/src/declarativeimports/plasmacomponents/qml/TextField.qml
@@ -273,8 +273,8 @@ FocusScope {
     //property alias activeFocus: textInput.activeFocus
 
     // TODO: fix default size
-    implicitWidth: theme.defaultFont.mSize.width*12 + base.internalPadding*2
-    implicitHeight: theme.defaultFont.mSize.height + base.internalPadding*2
+    implicitWidth: theme.mSize(theme.defaultFont).width*12 + base.internalPadding*2
+    implicitHeight: theme.mSize(theme.defaultFont).height + base.internalPadding*2
     // TODO: needs to define if there will be specific graphics for
     //     disabled text fields
     opacity: enabled ? 1.0 : 0.5
@@ -292,7 +292,7 @@ FocusScope {
         anchors.fill: parent
         imagePath: "widgets/lineedit"
         prefix: "base"
-        property real internalPadding: theme.defaultFont.mSize.height*0.3
+        property real internalPadding: theme.mSize(theme.defaultFont).height*0.3
     }
 
     MouseArea {
diff --git a/src/declarativeimports/plasmacomponents/qml/ToolButton.qml b/src/declarativeimports/plasmacomponents/qml/ToolButton.qml
index 0f20ada16..6ea39b1fb 100644
--- a/src/declarativeimports/plasmacomponents/qml/ToolButton.qml
+++ b/src/declarativeimports/plasmacomponents/qml/ToolButton.qml
@@ -98,11 +98,11 @@ Item {
         if (label.text.length == 0) {
             height;
         } else {
-            Math.max(theme.defaultFont.mSize.width*12, minimumWidth);
+            Math.max(theme.mSize(theme.defaultFont).width*12, minimumWidth);
         }
     }
 
-    implicitHeight: Math.max(theme.defaultFont.mSize.height*1.6, minimumHeight)
+    implicitHeight: Math.max(theme.mSize(theme.defaultFont).height*1.6, minimumHeight)
 
     // TODO: needs to define if there will be specific graphics for
     //     disabled buttons
diff --git a/src/declarativeimports/plasmacomponents/qml/private/DualStateButton.qml b/src/declarativeimports/plasmacomponents/qml/private/DualStateButton.qml
index 694c21d0e..67d6d4a75 100644
--- a/src/declarativeimports/plasmacomponents/qml/private/DualStateButton.qml
+++ b/src/declarativeimports/plasmacomponents/qml/private/DualStateButton.qml
@@ -55,7 +55,7 @@ Item {
     property alias shadow: shadowLoader.sourceComponent
 
     width: surfaceLoader.width + label.paintedWidth
-    height: theme.defaultFont.mSize.height*1.6
+    height: theme.mSize(theme.defaultFont).height*1.6
     // TODO: needs to define if there will be specific graphics for
     //     disabled buttons
     opacity: dualButton.enabled ? 1.0 : 0.5
diff --git a/src/declarativeimports/plasmacomponents/qml/private/TabBarLayout.qml b/src/declarativeimports/plasmacomponents/qml/private/TabBarLayout.qml
index 7125c28d8..5979d5853 100644
--- a/src/declarativeimports/plasmacomponents/qml/private/TabBarLayout.qml
+++ b/src/declarativeimports/plasmacomponents/qml/private/TabBarLayout.qml
@@ -175,7 +175,7 @@ Item {
                     }
                 }
 
-                var maxAllowedWidth = theme.defaultFont.mSize.width * 14
+                var maxAllowedWidth = theme.mSize(theme.defaultFont).width * 14
                 var itemWidth = (root.width - (visibleChildCount-1)*10) / visibleChildCount
 
                 var itemIndex = mirrored ? childCount - 1 : 0
diff --git a/src/declarativeimports/plasmaextracomponents/qml/PageRow.qml b/src/declarativeimports/plasmaextracomponents/qml/PageRow.qml
index e6e1e148e..6ff9ba15c 100644
--- a/src/declarativeimports/plasmaextracomponents/qml/PageRow.qml
+++ b/src/declarativeimports/plasmaextracomponents/qml/PageRow.qml
@@ -58,7 +58,7 @@ Item {
     property ToolBar toolBar
     property variant initialPage
     //A column is wide enough for 30 characters
-    property int columnWidth: Math.round(parent.width/(theme.defaultFont.mSize.width*30)) > 0 ? parent.width/Math.round(parent.width/(theme.defaultFont.mSize.width*30)) : width
+    property int columnWidth: Math.round(parent.width/(theme.mSize(theme.defaultFont).width*30)) > 0 ? parent.width/Math.round(parent.width/(theme.mSize(theme.defaultFont).width*30)) : width
     property alias clip: scrollArea.clip
 
     // Indicates whether there is an ongoing page transition.
diff --git a/src/shell/qmlpackages/desktop/contents/components/CompactApplet.qml b/src/shell/qmlpackages/desktop/contents/components/CompactApplet.qml
index 5d7a45b40..4c2e61b2d 100644
--- a/src/shell/qmlpackages/desktop/contents/components/CompactApplet.qml
+++ b/src/shell/qmlpackages/desktop/contents/components/CompactApplet.qml
@@ -48,8 +48,8 @@ Item {
         mainItem: Item {
             id: appletParent
 
-            width: applet && applet.implicitWidth > 0 ? applet.implicitWidth : theme.defaultFont.mSize.width * 35
-            height: applet && applet.implicitHeight > 0 ? applet.implicitHeight : theme.defaultFont.mSize.height * 25
+            width: applet && applet.implicitWidth > 0 ? applet.implicitWidth : theme.mSize(theme.defaultFont).width * 35
+            height: applet && applet.implicitHeight > 0 ? applet.implicitHeight : theme.mSize(theme.defaultFont).height * 25
             onWidthChanged: applet.width = width
             onHeightChanged: applet.height = height
         }
diff --git a/src/shell/qmlpackages/desktop/contents/components/Configuration.qml b/src/shell/qmlpackages/desktop/contents/components/Configuration.qml
index edf9e0011..f20fc4231 100644
--- a/src/shell/qmlpackages/desktop/contents/components/Configuration.qml
+++ b/src/shell/qmlpackages/desktop/contents/components/Configuration.qml
@@ -117,7 +117,7 @@ Rectangle {
                 visible: (configDialog.configModel ? configDialog.configModel.count : 0) + globalConfigModel.count > 1
                 width: visible ? 100 : 0
                 implicitWidth: width
-                implicitHeight: theme.defaultFont.mSize.height * 12
+                implicitHeight: theme.mSize(theme.defaultFont).height * 12
                 Flickable {
                     id: categoriesView
                     contentWidth: width