Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-20768

[Regression] With QtQuick 2.0 it is not possible anymore to get a top level translucent item.

    XMLWordPrintable

Details

    • a79e42b8f40317f7275b26637e6735754b21727f(Windows, using blurbehind-DWM effects to work around)

    Description

      If the top level item in the QML file is translucent it should be a translucent window. With QtQuick 2.0 and SG it's always white.

      In QtQuick 1.1 :

      #include <QtGui>
      #include <QtDeclarative>
      
      
      int main(int argc, char** argv)
      {
          QApplication app(argc, argv);
          QDeclarativeView * view = new QDeclarativeView;
          view->setAttribute(Qt::WA_TranslucentBackground, true);
          view->viewport()->setAutoFillBackground(false);
          view->setSource(QUrl::fromLocalFile("test.qml"));
          view->show();
          return app.exec();
      }
      

      was working fine.

      On QtQuick 2.0 this snippet doesn't work :

      #include <QtGui>
      #include <QtDeclarative>
      
      
      int main(int argc, char** argv)
      {
          QApplication app(argc, argv);
          QSGView * view = new QSGView;
          view->setAutoFillBackground(false);
          view->setAttribute(Qt::WA_TranslucentBackground, true);
          view->setSource(QUrl::fromLocalFile("test.qml"));
          view->show();
          return app.exec();
      }
      

      It seems there is no viewport() concept in SGView so I set directly on the widget itself.

      This bug is very annoying it makes impossible to implement nice popup in QML or translucent overlays.

      Attached the qml file used in the snippets.

      Attachments

        1. qtbug-20768.tgz
          0.8 kB
        2. test.qml
          0.1 kB

        Issue Links

          No reviews matched the request. Check your Options in the drop-down menu of this sections header.

          Activity

            People

              sletta Gunnar Sletta
              darktears Alexis Menard
              Votes:
              9 Vote for this issue
              Watchers:
              20 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

                Gerrit Reviews

                  There are no open Gerrit changes