use new assistive control app when using system virtual keyboard on osx >= 10.15

src/document/UBDocumentController.cpp

@@ -664,7 +664,7 @@ QMimeData *UBDocumentTreeModel::mimeData (const QModelIndexList &indexes) const
 
 #if defined(Q_OS_OSX)
     #if (QT_VERSION < QT_VERSION_CHECK(5, 15, 0))
-        if (QOperatingSystemVersion::current().minorVersion() < 15) /* < Mojave */
+        if (QOperatingSystemVersion::current().majorVersion() == 10 && QOperatingSystemVersion::current().minorVersion() < 15) /* <= Mojave */
             mimeData->setUrls(urlList);
     #endif
 #else

src/frameworks/UBPlatformUtils_mac.mm

@@ -31,6 +31,7 @@
 #include "core/UBApplication.h"
 #include "core/UBSettings.h"
 #include "frameworks/UBFileSystemUtils.h"
+#include "gui/UBMainWindow.h"
 
 #include <QWidget>
 
@@ -621,10 +622,12 @@ void UBPlatformUtils::showFullScreen(QWidget *pWidget)
 
 
 void UBPlatformUtils::showOSK(bool show)
+{
+    if (QOperatingSystemVersion::current().majorVersion() == 10 && QOperatingSystemVersion::current().minorVersion() < 15) /* < Catalina */
     {
         @autoreleasepool {
             CFDictionaryRef properties = (CFDictionaryRef)[NSDictionary
-                      dictionaryWithObject: @"com.apple.KeyboardViewer"
+                          dictionaryWithObject: @"com.apple.keyboardViewer"
                           forKey: (NSString *)kTISPropertyInputSourceID];
 
             NSArray *sources = (NSArray *)TISCreateInputSourceList(properties, true);
@@ -654,3 +657,59 @@ void UBPlatformUtils::showOSK(bool show)
             }
         }
     }
+    else
+    {
+        NSString *source =
+            @"tell application \"System Events\"\n\
+                if application process \"TextInputMenuAgent\" exists then\n\
+                    tell application process \"TextInputMenuAgent\"\n\
+                        tell menu bar item 1 of menu bar 2\n\
+                            ignoring application responses\n\
+                                click\n\
+                            end ignoring\n\
+                        end tell\n\
+                    end tell\n\
+                end if\n\
+            end tell\n\
+            do shell script \"killall 'System Events'\"\n";
+
+            source = [source stringByAppendingString:@"if application \"Assistive Control\" is"];
+
+            if (show)
+            {
+                source = [source stringByAppendingString:@" not"];
+            }
+
+            source = [source stringByAppendingString:@" running then\n\
+                tell application \"System Events\"\n\
+                    tell application process \"TextInputMenuAgent\"\n\
+                        tell menu 1 of menu bar item 1 of menu bar 2\n\
+                            click menu item 2\n\
+                        end tell\n\
+                    end tell\n\
+                end tell\n\
+            end if"];
+
+        NSAppleScript *script = [[[NSAppleScript alloc] initWithSource:source] autorelease];
+        NSDictionary  *errorInfo   = nil;
+        [script executeAndReturnError:&errorInfo];
+
+        if(errorInfo!=nil)
+        {
+            NSAlert *alert = [[NSAlert alloc] init];
+
+            if (alert != nil)
+            {
+                alert.messageText = errorInfo.allValues[0];
+                [alert runModal];
+                [alert release];
+
+                //restore action state to previous one as it failed
+                if (show)
+                    UBApplication::mainWindow->actionVirtualKeyboard->setChecked(false);
+                else
+                    UBApplication::mainWindow->actionVirtualKeyboard->setChecked(true);
+            }
+        }
+    }
+}