qml: allow ContinueButton to stay at the bottom

With the ScrollView now containing the InformationPages, the
ContinueButton was not able to stick to the bottom of the view
due to contentHeight being too limited. This allows contentHeight
to grow with the screen while limiting it so the button doesn't
overlap with the information.

Github-Pull: #194
Rebased-From: d17e309

Author: Johnny Carlson

src/qml/BitcoinApp/Controls/InformationPage.qml

@@ -9,6 +9,7 @@ import org.bitcoincore.qt
 
 Page {
     id: root
+    implicitHeight: parent.height
     property alias bannerItem: banner_loader.sourceComponent
     property alias detailItem: detail_loader.sourceComponent
     property alias navLeftDetail: navbar.leftDetail
@@ -41,12 +42,11 @@ Page {
     }
 
     ScrollView {
+        id: scrollView
         width: parent.width
         height: parent.height
         clip: true
         contentWidth: width
-        contentHeight: information.height + continueButton.height
-            + continueButton.anchors.topMargin + continueButton.anchors.bottomMargin
 
         ColumnLayout {
             id: information
@@ -115,6 +115,18 @@ Page {
                 anchors.top: undefined
                 anchors.bottom: continueButton.parent.bottom
             }
+            PropertyChanges {
+                target: scrollView
+                contentHeight: {
+                    var combinedHeight = information.height + continueButton.height
+                        + continueButton.anchors.topMargin + continueButton.anchors.bottomMargin
+                    if (scrollView.height < combinedHeight) {
+                        return combinedHeight
+                    } else {
+                        return scrollView.height
+                    }
+                }
+            }
         },
         State {
             name: "DESKTOP"
@@ -123,6 +135,11 @@ Page {
                 anchors.top: information.bottom
                 anchors.bottom: undefined
             }
+            PropertyChanges {
+                target: scrollView
+                contentHeight: information.height + continueButton.height
+                    + continueButton.anchors.topMargin + continueButton.anchors.bottomMargin
+            }
         }
     ]
 }