Qt-interest Archive, November 1999
Fullscreen mode - HOW?
Message 1 in thread
I've been attempting to get an application to support a fullscreen mode
using reparent/recreate to change the WFlags. Going into fullscreen mode
works, however, when attempting to return to windowed mode the window
disappears (ie is not re-mapped by the window manager). I can't seem to
find any way around this except to destroy the widget and make a new
one.
Ideas anyone?
A example illustrating the problem is attached.
TIA,
--
[ signature omitted ]
#include <stdlib.h>
#include <qimage.h>
#include <qwidget.h>
#include <qpainter.h>
#include "qapp.h"
class fsWidget : public QWidget
{
public:
fsWidget();
void toggleFS();
protected:
virtual void paintEvent(QPaintEvent *e);
virtual void mousePressEvent(QMouseEvent *e);
private:
QPixmap img;
bool fs;
};
fsWidget::fsWidget() : QWidget()
{
img.load(QString(getenv("QTDIR"))+"/html/qtlogo.png");
resize(img.size());
setBackgroundColor(black);
fs=false;
}
void
fsWidget::paintEvent(QPaintEvent *e)
{
QPainter painter(this);
painter.drawPixmap((width()-img.width())/2, (height()-img.height())/2, img);
}
void
fsWidget::toggleFS()
{
fs=!fs;
if (fs) { // go full screen
reparent( 0, WStyle_Customize | WStyle_NoBorder | WType_Popup,
QPoint( 0, 0 ), false );
resize(QApplication::desktop()->size());
setFocusPolicy( QWidget::StrongFocus );
qApp->processEvents();
show();
setFocus();
} else { // go back to windowed mode
close(false);
reparent( 0, 0, QPoint(0,0), true );
show();
}
}
void
fsWidget::mousePressEvent(QMouseEvent *e)
{
toggleFS();
}
int main( int argc, char **argv )
{
QApplication app( argc, argv);
fsWidget it;
app.setMainWidget(&it);
it.show();
app.exec();
}
Message 2 in thread
On Tue, 02 Nov 1999, Andrew Richards wrote:
> >%_I've been attempting to get an application to support a fullscreen mode
> using reparent/recreate to change the WFlags. Going into fullscreen mode
> works, however, when attempting to return to windowed mode the window
> disappears (ie is not re-mapped by the window manager). I can't seem to
> find any way around this except to destroy the widget and make a new
> one.
>
> Ideas anyone?
Your approach is more or less right. It's a bug in the X11 version of Qt,
thanks for the bugreport.
Please add the following workaround after the reparent() to become full
screen:
extraData()->topextra->wmstate = 0;
Apart from that your example has only three flaws left (that you couldn't test,
since Qt wasn't working):
- add resize( img.size() ) when going back to windowed mode. You may want
to restore the x/y position as well.
- don't use a WType_Popup, but only WStyle_NoBorder. When a popup closes
due to a mouse press event, the mouse event is replayed (or use
mouseReleaseEvent() in your application).
- don't call close() before going back to windowed mode. Your widget is a
main widget, if you close it, the application will exit.
Hope that helps,
Matthias
--
[ signature omitted ]
Message 3 in thread
You need to put the correct WFlags into your reparent statement coming out of
Ful Screen mode. You need to look up the normal ones and use them, I don't think
you can use just zero.
Tim
____________________Reply Separator____________________
Subject: Fullscreen mode - HOW?
Author: Andrew Richards <A.Richards@phys.canterbury.ac.nz>
Date: 11/2/99 11:48 PM
I've been attempting to get an application to support a fullscreen mode
using reparent/recreate to change the WFlags. Going into fullscreen mode
works, however, when attempting to return to windowed mode the window
disappears (ie is not re-mapped by the window manager). I can't seem to
find any way around this except to destroy the widget and make a new
one.
Ideas anyone?
A example illustrating the problem is attached.
TIA,
--
[ signature omitted ]
#include <stdlib.h>
#include <qimage.h>
#include <qwidget.h>
#include <qpainter.h>
#include "qapp.h"
class fsWidget : public QWidget
{
public:
fsWidget();
void toggleFS();
protected:
virtual void paintEvent(QPaintEvent *e);
virtual void mousePressEvent(QMouseEvent *e);
private:
QPixmap img;
bool fs;
};
fsWidget::fsWidget() : QWidget()
{
img.load(QString(getenv("QTDIR"))+"/html/qtlogo.png");
resize(img.size());
setBackgroundColor(black);
fs=false;
}
void
fsWidget::paintEvent(QPaintEvent *e)
{
QPainter painter(this);
painter.drawPixmap((width()-img.width())/2, (height()-img.height())/2, img);
}
void
fsWidget::toggleFS()
{
fs=!fs;
if (fs) { // go full screen
reparent( 0, WStyle_Customize | WStyle_NoBorder | WType_Popup,
QPoint( 0, 0 ), false );
resize(QApplication::desktop()->size());
setFocusPolicy( QWidget::StrongFocus );
qApp->processEvents();
show();
setFocus();
} else { // go back to windowed mode
close(false);
reparent( 0, 0, QPoint(0,0), true );
show();
}
}
void
fsWidget::mousePressEvent(QMouseEvent *e)
{
toggleFS();
}
int main( int argc, char **argv )
{
QApplication app( argc, argv);
fsWidget it;
app.setMainWidget(&it);
it.show();
app.exec();
}
