Compute scrollbar extent using alternate props

This computation is close enough, and removes the need for private
headers.

CMakeLists.txt

@@ -342,28 +342,6 @@ if (USE_DBUS)
 else()
 endif (USE_DBUS)
 
-##############################################################################
-
-function(check_private_headers_exist module private_includes_var)
-message(STATUS "Checking whether private include directories for module ${module} exist")
-foreach(_dir ${private_includes_var})
-  if(NOT EXISTS "${_dir}")
-    message(FATAL_ERROR "The private include directory ${_dir} for module ${module} do not exist! Please make sure your Qt5 installation contains private headers.\nThe required directories:\n  ${private_includes_var}")
-  endif()
-endforeach()
-endfunction()
-function(check_private_header_exists _file _dirs)
-set(_found FALSE)
-foreach(_dir ${_dirs})
-  if(EXISTS "${_dir}/${_file}")
-    set(_found TRUE)
-  endif()
-endforeach()
-if(NOT _found)
-  message(FATAL_ERROR "The private include file ${_file} was not found in directory ${_dirs}! Please make sure your Qt5 installation contains private headers.")
-endif()
-endfunction()
-
 ##############################################################################
 ## Qt5 setup setup
 if (ENABLE_QT)
@@ -373,23 +351,6 @@ if (ENABLE_QT)
         message(STATUS "Will enable Qt launcher GUI")
         message(STATUS "  Qt5Widgets version: ${Qt5Widgets_VERSION_STRING}")
         message(STATUS "  Qt5Widgets include dir: ${Qt5Widgets_INCLUDE_DIRS}")        
-
-        # copied from KDAB's GammaRay CMakeLists.txt
-        # Sanity checking, we need private includes for the following modules
-
-        check_private_headers_exist("Qt5Gui" "${Qt5Gui_PRIVATE_INCLUDE_DIRS}")
-
-        #HACK: CMake with broken Qt5Quick_PRIVATE_INCLUDE_DIRS
-        if (NOT "${Qt5Quick_PRIVATE_INCLUDE_DIRS}" MATCHES "/QtQuick/")
-            string(REPLACE "/QtCore" "/QtQuick" replaceme "${Qt5Core_PRIVATE_INCLUDE_DIRS}")
-            list(APPEND Qt5Quick_PRIVATE_INCLUDE_DIRS ${Qt5Qml_PRIVATE_INCLUDE_DIRS})
-            list(APPEND Qt5Quick_PRIVATE_INCLUDE_DIRS ${replaceme})
-            list(REMOVE_DUPLICATES Qt5Quick_PRIVATE_INCLUDE_DIRS)
-        endif()
-        check_private_header_exists("private/qquickitem_p.h" "${Qt5Quick_PRIVATE_INCLUDE_DIRS}")
-
-        message(STATUS "  Qt5Quick private include dir: ${Qt5Quick_PRIVATE_INCLUDE_DIRS}")
-        
         set(HAVE_QT 1)
     else()
         # don't try to build FGQCanvas if Qt wasn't found correctly

src/GUI/CMakeLists.txt

@@ -148,15 +148,13 @@ if (HAVE_QT)
                         PreviewImageItem.hxx
                         ThumbnailImageItem.cxx
                         ThumbnailImageItem.hxx
-                        FlickableExtentQuery.cxx
-                        FlickableExtentQuery.hxx
                         PopupWindowTracker.cxx
                         PopupWindowTracker.hxx
                         )
 
     set_property(TARGET fgqmlui PROPERTY AUTOMOC ON)
     target_link_libraries(fgqmlui Qt5::Quick Qt5::Network Qt5::Qml SimGearCore)
-    target_include_directories(fgqmlui PRIVATE ${PROJECT_BINARY_DIR}/src/GUI ${Qt5Quick_PRIVATE_INCLUDE_DIRS})
+    target_include_directories(fgqmlui PRIVATE ${PROJECT_BINARY_DIR}/src/GUI)
 endif()
 
 

src/GUI/FlickableExtentQuery.cxx

@@ -1,46 +0,0 @@
-#include "FlickableExtentQuery.hxx"
-
-#include <QtQuick/private/qquickflickable_p.h>
-
-class FriendFlickable : public QQuickFlickable
-{
-public:
-    friend class FlickableExtentQuery;
-};
-
-FlickableExtentQuery::FlickableExtentQuery(QObject *parent) : QObject(parent)
-{
-
-}
-
-qreal FlickableExtentQuery::verticalExtent() const
-{
-    QQuickFlickable* flick = qobject_cast<QQuickFlickable*>(m_flickable);
-    if (!flick) {
-        return 0;
-    }
-
-    FriendFlickable* ff = static_cast<FriendFlickable*>(flick);
-    qreal extent = -ff->maxYExtent() + ff->minYExtent();
-    return extent;
-}
-
-qreal FlickableExtentQuery::minYExtent() const
-{
-    QQuickFlickable* flick = qobject_cast<QQuickFlickable*>(m_flickable);
-    if (!flick) {
-        return 0;
-    }
-
-    FriendFlickable* ff = static_cast<FriendFlickable*>(flick);
-    return ff->minYExtent();
-}
-
-void FlickableExtentQuery::setFlickable(QQuickItem *flickable)
-{
-    if (m_flickable == flickable)
-        return;
-
-    m_flickable = flickable;
-    emit flickableChanged(m_flickable);
-}

src/GUI/FlickableExtentQuery.hxx

@@ -1,41 +0,0 @@
-#ifndef FLICKABLEEXTENTQUERY_HXX
-#define FLICKABLEEXTENTQUERY_HXX
-
-#include <QObject>
-#include <QQuickItem>
-
-/**
- * @brief FlickableExtentQuery exists to expose some unfortunately private
- * information from a Flickable, to mimic what QQC2 Scrollbar does internlly.
- */
-class FlickableExtentQuery : public QObject
-{
-    Q_OBJECT
-
-    Q_PROPERTY(QQuickItem* flickable READ flickable WRITE setFlickable NOTIFY flickableChanged)
-
-public:
-    explicit FlickableExtentQuery(QObject *parent = nullptr);
-
-    QQuickItem* flickable() const
-    {
-        return m_flickable;
-    }
-
-    Q_INVOKABLE qreal verticalExtent() const;
-
-    Q_INVOKABLE qreal minYExtent() const;
-
-signals:
-
-    void flickableChanged(QQuickItem* flickable);
-
-public slots:
-
-void setFlickable(QQuickItem* flickable);
-
-private:
-    QQuickItem* m_flickable = nullptr;
-};
-
-#endif // FLICKABLEEXTENTQUERY_HXX

src/GUI/LauncherController.cxx

@@ -33,7 +33,6 @@
 #include "RecentLocationsModel.hxx"
 #include "ThumbnailImageItem.hxx"
 #include "PreviewImageItem.hxx"
-#include "FlickableExtentQuery.hxx"
 #include "MPServersModel.h"
 #include "AircraftSearchFilterModel.hxx"
 #include "DefaultAircraftLocator.hxx"
@@ -101,7 +100,6 @@ void LauncherController::initQML()
     qmlRegisterUncreatableType<MPServersModel>("FlightGear.Launcher", 1, 0, "MPServers", "Singleton API");
 
     qmlRegisterType<FileDialogWrapper>("FlightGear.Launcher", 1, 0, "FileDialog");
-    qmlRegisterType<FlickableExtentQuery>("FlightGear.Launcher", 1, 0, "FlickableExtentQuery");
     qmlRegisterType<QmlAircraftInfo>("FlightGear.Launcher", 1, 0, "AircraftInfo");
     qmlRegisterType<PopupWindowTracker>("FlightGear.Launcher", 1, 0, "PopupWindowTracker");
 

src/GUI/qml/Scrollbar.qml

@@ -1,5 +1,4 @@
 import QtQuick 2.4
-import FlightGear.Launcher 1.0
 
 Item
 {
@@ -8,7 +7,6 @@ Item
     implicitWidth: 14
 
     property Flickable flickable: parent
-
     readonly property real heightRatio: flickable ? flickable.visibleArea.heightRatio : 0
 
     readonly property int barSize: Math.max(height * heightRatio, width * 3);
@@ -24,9 +22,10 @@ Item
         return visArea.yPosition / (1.0 - visArea.heightRatio);
     }
 
-    FlickableExtentQuery {
-        id: extentQuery
-        flickable: root.flickable
+    function verticalExtent()
+    {
+        var f = root.flickable;
+        return (f.height / f.visibleArea.heightRatio) - f.height;
     }
 
     MouseArea {
@@ -35,8 +34,7 @@ Item
         anchors.fill: parent
         onClicked: {
             var clickPos = (mouse.y / height)
-            var cy = clickPos * extentQuery.verticalExtent() - extentQuery.minYExtent();
-            flickable.contentY = cy;
+            flickable.contentY = clickPos * verticalExtent();
         }
         visible: root.enabled
     }
@@ -76,10 +74,9 @@ Item
 
                 onMouseYChanged: {
                     var position = (thumb.y / root.scrollRange)
-                    var cy =  position * extentQuery.verticalExtent() - extentQuery.minYExtent();
-                    flickable.contentY = cy;
+                    flickable.contentY = position * verticalExtent();
                 }
             }
         }
-    }
+    } // of track item
 }