Hi,
A QWidget based program built with Qt 5 (5.7.1 to be more exact) and built
with Qt 4 (4.8.7) behaves differently.
I have a Linux box just with X.org, no window manager. There is an auto
login user that starts X with this ~/.xinitrc :
xloadimage -onroot -quiet -fullscreen /home/vision/background.jpeg
setterm -blank 0 -powersave off -powerdown 0
xset s off
xset -dpms
xrdb ~/.Xresources
exec /home/vision/bin/test5
# exec /home/vision/bin/test4
The latest lines are used to select the "test" program (main.cpp and
test.pro below), built against Qt5 ("test5") or Qt4 ("test4"):
// ------- main.cpp
#include <QApplication>
#include <QDesktopWidget>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QSpacerItem>
#include <QWidget>
#include <QString>
#include <QPushButton>
QHBoxLayout * horizontalLayout;
QVBoxLayout * verticalLayout;
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWidget *widget = new QWidget();
widget->resize(800, 600);
int X = qApp->desktop()->screenGeometry().width();
int Y = qApp->desktop()->screenGeometry().height();
QString resolution = QString("Screen Geometry = %1 X
%2").arg(X).arg(Y);
horizontalLayout = new QHBoxLayout();
horizontalLayout->setSpacing(5);
horizontalLayout->setContentsMargins(11, 11, 11, 11);
horizontalLayout->setSizeConstraint(QLayout::SetMinimumSize);
horizontalLayout->setContentsMargins(5, 5, 5, 5);
verticalLayout = new QVBoxLayout();
verticalLayout->setSpacing(5);
verticalLayout->setContentsMargins(11, 11, 11, 11);
verticalLayout->setSizeConstraint(QLayout::SetMinimumSize);
horizontalLayout->setContentsMargins(5, 5, 5, 5);
QSpacerItem * verticalSpacer_01 = new QSpacerItem(20, 10,
QSizePolicy::Minimum, QSizePolicy::Expanding);
QPushButton * button_01 = new QPushButton(resolution, widget);
QSpacerItem * verticalSpacer_02 = new QSpacerItem(20, 10,
QSizePolicy::Minimum, QSizePolicy::Expanding);
QSpacerItem * horizontalSpacer_01 = new QSpacerItem(10, 20,
QSizePolicy::Expanding, QSizePolicy::Minimum);
QSpacerItem * horizontalSpacer_02 = new QSpacerItem(10, 20,
QSizePolicy::Expanding, QSizePolicy::Minimum);
verticalLayout->addItem(verticalSpacer_01);
verticalLayout->addWidget(button_01);
verticalLayout->addItem(verticalSpacer_02);
horizontalLayout->addItem(horizontalSpacer_01);
horizontalLayout->addItem(verticalLayout);
horizontalLayout->addItem(horizontalSpacer_02);
QObject::connect(button_01, SIGNAL(pressed()), widget,
SLOT(close()));
widget->setLayout(horizontalLayout);
widget->showFullScreen();
widget->setWindowState(Qt::WindowFullScreen);
return a.exec();
}
// ------- end of main.cpp
# -------- test.pro - it changes the TARGET according to which Qt major
version used;
QT += core
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = test4
greaterThan(QT_MAJOR_VERSION, 4): TARGET = test5
TEMPLATE = app
DEPENDPATH += .
INCLUDEPATH += .
SOURCES += main.cpp
# -------- end of test.pro
Although using any of the window managers I've tested results the same
(very little visual differences), the Qt-5 version is unable to go full
screen when not using a window manager, although it is able to read the
screen resolution.
I've tried to mangle a full screen, but the widget is unable to show
anything on the region that it didn't reach at start. I mean, if the
program starts as a partial window and I set it up to resize to full screen
resolution, the new area is not used to paint anything.
Is it a bug, or will I **have to** use a window manager?
In fact, the application I run in this box is the only one that will run at
all and the only one available, so I thought I would never need a window
manager.
Thanks a lot.
Francisco
_______________________________________________
Interest mailing list
Interest@qt-project.org
http://lists.qt-project.org/mailman/listinfo/interest
