Qt 4.8 QSlider handle size

[SPlatten]

@hskoglund I've done that and it doesn't. The sliders are visible one of top of the other with different handles on each.

[hskoglund]

I see, perhaps there’s a difference between 4.8.4 and 4.8.7. Is it possible for you to upgrade your version of Qt to 4.8.7?

[SPlatten]

@hskoglund , unfortunately not. I have no control over the clients systems and the versions of Qt used.

[hskoglund]

No worries, I found Qt 4..8.4 and installed it with MinGW gcc 4.4.0.
Then I created a directory C:\Main with just a file main.pro containing this line:

SOURCES += main.cpp

then created a main.cpp with a copy of my code from my post above (about 2 hours ago). Then i typed:
C:\Qt\4.8.4\bin\qtvars.bat
and got this:

Setting up a MinGW/Qt only environment...
-- QTDIR set to C:\Qt\4.8.4
-- PATH set to C:\Qt\4.8.4\bin
-- Adding C:\MinGW\bin to PATH
-- Adding C:\Windows\System32 to PATH
-- QMAKESPEC set to win32-g++```

then i typed
qmake
make
and gpt this:

mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/Main'
C:\Qt\4.8.4\bin\moc.exe -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -
DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_H
AVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\Qt\4.8.4\include\QtCore" -I"
..\Qt\4.8.4\include\QtGui" -I"..\Qt\4.8.4\include" -I"..\Qt\4.8.4\include\Active
Qt" -I"debug" -I"..\Qt\4.8.4\mkspecs\win32-g++" -D__GNUC__ -DWIN32 main.cpp -o d
ebug\main.moc
g++ -c -pipe -g -frtti -fexceptions -mthreads -Wall -Wextra -DUNICODE -DQT_LARGE
FILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -
DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAI
N -I"..\Qt\4.8.4\include\QtCore" -I"..\Qt\4.8.4\include\QtGui" -I"..\Qt\4.8.4\in
clude" -I"..\Qt\4.8.4\include\ActiveQt" -I"debug" -I"..\Qt\4.8.4\mkspecs\win32-g
++" -o debug\main.o main.cpp
g++ -mthreads -Wl,-subsystem,windows -o debug\Main.exe debug/main.o  -L"c:\Qt\4.
8.4\lib" -lmingw32 -lqtmaind -lQtGuid4 -lQtCored4
mingw32-make[1]: Leaving directory `C:/Main

then when i type
C:\Main\debug\main.exe
my app looks the same as the screenshot above (i.e. with just two sliders visibile), so 4.8.4 looks the same 4.8.7 (for this project anyway).

Perhaps you are using a different compiler than MinGW gcc 4.4.0?

[SPlatten]

@hskoglund, the compiler is:

gcc (Gentoo 4.6.3 p1.13, pie-0.5.2) 4.6.3
Copyright (C) 2011 Free Software Foundation, Inc.

[hskoglund]

Ok that could explain the different behavior, I never tested on Gentoo, sorry :-(

[SPlatten]

@hskoglund , I thought I would take another look and I was wrong, looking at Qt Build & Run the compilers are:

Auto-detected
    g++ (gnat-2014-4-x86)
    gcc (x86 64bit in /usr/bin)
    gcc (x86 32bit in /usr/bin)

I then cleaned and rebuilt and can see in the Compiler Output it is using g++. I then opened a terminal and typed: g++ --version:

g++ (Gentoo 4.6.3 p1.13, pie-0.5.2) 4.6.3

So it looks like it is the same version after all.

[hskoglund]

Hi I googled that Gentoo release and it seems that there's no online installation of Qt 4.8.4 available for it, so I think your version of Qt 4.8.4 is custom built, i.e. built by downloading the source for Qt 4.8.4 and compiling. And in that process some features might have been dropped, for example z-order for widgets.
So I simplified my example to not to rely on a working z-order, please try this version:

#include <QApplication>
#include <qslider.h>

class Window : public QWidget
{
    Q_OBJECT

// setup 2 real sliders and 2 "followers" that are stacked under the real ones
    QSlider* pSlider1;
    QSlider* pSlider1Follower;
    QSlider* pSlider2;
    QSlider* pSlider2Follower;

public:
    Window()
    {
        setGeometry(130,130,860,660);

        pSlider1Follower = new QSlider(Qt::Horizontal,this);
        pSlider1Follower->setTickPosition(QSlider::TicksBothSides);
        pSlider1Follower->setTickInterval(2);

        pSlider2Follower = new QSlider(Qt::Vertical,this);
        pSlider2Follower->setTickPosition(QSlider::TicksBothSides);
        pSlider2Follower->setTickInterval(2);

        pSlider1 = new QSlider(Qt::Horizontal,this);
        pSlider2 = new QSlider(Qt::Vertical,this);

        connect(pSlider1,SIGNAL(valueChanged(int)),this,SLOT(valueChanged1(int)));
        connect(pSlider2,SIGNAL(valueChanged(int)),this,SLOT(valueChanged2(int)));

    // do an initial update/refresh
        valueChanged1(0);
        valueChanged2(0);
    }

public slots:
    void valueChanged1(int value)
    {
        pSlider1Follower->setValue(value);

        pSlider2->setStyleSheet(QString("QSlider::groove { background: transparent; width: %1px; } "
       "QSlider::handle { background: #eeeeee; border:1px solid grey; height: %2px;}").arg(value + 30).arg(value * 2 + 10));

        pSlider2->setGeometry(660,30,2 * value + 30,600);
        pSlider2Follower->setGeometry(660,30,2 * value + 30,600);
    }

    void valueChanged2(int value)
    {
        pSlider2Follower->setValue(value);

        pSlider1->setStyleSheet(QString("QSlider::groove { background: transparent; height: %1px; } "
       "QSlider::handle { background: #eeeeee; border:1px solid grey; width: %2px;}").arg(value + 30).arg(value * 2 + 10));

        pSlider1->setGeometry(30,300,600,2 * value + 30);
        pSlider1Follower->setGeometry(30,300,600,2 * value + 30);
    }
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Window window;
    window.show();
    return app.exec();
}

#include "main.moc"

If it bulds ok, lets' debug:

1. How many sliders do you see?
2. If you move one of them, does it cause any other slider to move as well?
3. If you move one of them, does it cause any other slider to change in size?

[SPlatten]

@hskoglund , I’ll try this tomorrow and get back to you.

[SPlatten]

@hskoglund

1. 2 Sliders, 1 horizontal and 1 vertical, with two handles on each, the horizontal slider handles do not look correct.

2 . Moving the vertical slider causes both vertical handles to move together, the coloured square handle is correct orientation, this also increases height of horizontal slider.

Moving the horizontal slider increases the width of the vertical slider, but the handles are not together, one is the correct orientation but centered.

3. Vertical handles are in sync. Horizontal are not.

[hskoglund]

Hi, is it possible for you to post a screenshot, for example when all the sliders are at about 50%?

[SPlatten]

@hskoglund , unfortunately not, the development system is so locked down, I cannot get anything off the system, which is why when I post there are often errors in syntax because I have to retype it.

[hskoglund]

If you have a mobile phone with a camera, is it possible you could take a picture of the screen using your mobile phone?

[SPlatten]

@hskoglund , I can't paste the photo into this forum, it just gives the file URL.

[hskoglund]

Sometimes it's tricky to post a picture into this forum from a mobile phone :-(
If you have email installed on your phone, you could try emailing the picture to yourself, then open that picture on a computer and post it from there...

[SPlatten]

@hskoglund I have the photo and emailed it to myself, but I cannot access my email (personal) from these computers...it will have to wait until I get home later tonight.

[SPlatten]

@hskoglund , please see screenshot taken with phone:

cid:3BAF623A-7AF5-4E01-BE6B-D9971912745D

[hskoglund]

Hi, as you say, the vertical slider looks ok but not the horizontal one. Sure you copied my program ok? If you check with wc it should say:

70  166 2117 main.cpp

and the md5 sum:

md5sum main.cpp
1eaf936e1072bf34bbb817a942295ada  main.cpp

could you take a photo of the code after public slots: it should look like this:

Sorry to bother but over the years, many times I've been struck by that "not copied verbatim" bug...

[SPlatten]

@hskoglund , I work remotely 300 miles away from where I live, I'm home now and will be back at the system on Monday, I'll take a look and get back to you on Monday.

[SPlatten]

@hskoglund, I've been through the source again an yes there was an error in the CSS, which having corrected this what I'm seeing is still four handles, where the underlying handles are orientated incorrectly, the handles on-top of these are orientated as I would expected.

Moving the vertical slider increases the width of the horizontal slider.
Moving the horizontal slider increases the height of the vertical slider.