Support back and forward buttons.

qml/FolderGridView.qml

@@ -65,6 +65,8 @@ GridView {
     property bool scrollDown: false
 
     signal keyPress(var event)
+    signal backPress()
+    signal forwardPress()
 
     cacheBuffer: Math.max(0, control.height * 1.5)
     reuseItems: true
@@ -469,6 +471,13 @@ GridView {
         onClicked: {
             clearPressState()
 
+            if (mouse.buttons & Qt.BackButton) {
+              control.backPress()
+            }
+            if (mouse.buttons & Qt.ForwardButton){
+              control.forwardPress()
+            }
+
             if (mouse.buttons & Qt.RightButton) {
                 dirModel.openContextMenu(null, mouse.modifiers)
             }

qml/FolderListView.qml

@@ -52,6 +52,8 @@ ListView {
     property variant cachedRectangleSelection: null
 
     signal keyPress(var event)
+    signal backPress()
+    signal forwardPress()
 
     clip: true
     cacheBuffer: width
@@ -288,12 +290,20 @@ ListView {
                     dirModel.openContextMenu(null, mouse.modifiers)
                     mouse.accepted = true
                 }
+
             }
         }
 
         onClicked: {
             clearPressState()
 
+            if (mouse.buttons & Qt.BackButton) {
+              control.backPress()
+            }
+            if (mouse.buttons & Qt.ForwardButton){
+              control.forwardPress()
+            }
+
             if (!hoveredItem || hoveredItem.blank || control.currentIndex === -1 || control.ctrlPressed
                     || control.shiftPressed) {
                 return

qml/FolderPage.qml

@@ -337,6 +337,12 @@ Item {
             onCountChanged: {
                 _fileTips.visible = count === 0
             }
+            onForwardPressed: {
+              dirModel.goForward();
+            }
+            onBackPressed:{
+              dirModel.goBack();
+            }
         }
     }
 
@@ -356,6 +362,12 @@ Item {
             onCountChanged: {
                 _fileTips.visible = count === 0
             }
+            onForwardPressed: {
+              dirModel.goForward();
+            }
+            onBackPressed:{
+              dirModel.goBack();
+            }
 
             delegate: FolderListItem {}
         }