Enable mouse wheel scrolling in single-page PdfPageView

Change-Id: I20512187dcc872b2e0429968e9ad2a9899aee6c2
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

examples/pdf/pdfviewer/viewer.qml

@@ -53,6 +53,7 @@ import QtQuick.Layouts 1.14
 import QtQuick.Pdf 5.15
 import QtQuick.Shapes 1.14
 import QtQuick.Window 2.14
+import Qt.labs.animation 1.0
 import Qt.labs.platform 1.1 as Platform
 
 ApplicationWindow {
@@ -208,6 +209,21 @@ ApplicationWindow {
         searchString: searchField.text
     }
 
+    WheelHandler {
+        rotationScale: 15
+        target: pageView
+        property: "x"
+        orientation: Qt.Horizontal
+        acceptedDevices: PointerDevice.Mouse | PointerDevice.TouchPad
+    }
+    WheelHandler {
+        rotationScale: 15
+        target: pageView
+        property: "y"
+        orientation: Qt.Vertical
+        acceptedDevices: PointerDevice.Mouse | PointerDevice.TouchPad
+    }
+
     Drawer {
         id: searchDrawer
         edge: Qt.LeftEdge

src/pdf/quick/qml/PdfPageView.qml

@@ -37,6 +37,7 @@ import QtQuick 2.14
 import QtQuick.Controls 2.14
 import QtQuick.Pdf 5.15
 import QtQuick.Shapes 1.14
+import Qt.labs.animation 1.0
 
 Rectangle {
     // public API
@@ -260,4 +261,13 @@ Rectangle {
         id: tapHandler
         acceptedDevices: PointerDevice.Mouse | PointerDevice.Stylus
     }
+    // prevent it from being scrolled out of view
+    BoundaryRule on x {
+        minimum: 100 - root.width
+        maximum: root.parent.width - 100
+    }
+    BoundaryRule on y {
+        minimum: 100 - root.height
+        maximum: root.parent.height - 100
+    }
 }