Layouts and Window sizes problem

**PstdEr** · 29th October 2013, 04:17

I know , it may be difficult or rather boring to see this kind of post, but i have tried in various ways, yet could not get what i wanted.

I will explain in simple terms , so that i might get some reply.

what i want is to display all windows with the borders no matter they are in MinimumSize or MaximumSize.

the problem here is when it is in MinimumSize the windows DispWin, and LogWin are not completely seen, the KeyWin overlaps these two windows.
when Maximized every thing is seen with border.

I want the same look that shows in MinimumSize state even if the window is in MinimumSize, ofcourse the windows are small , but should be able to see full windows.

**ChrisW67** · 29th October 2013, 06:17

Your code does nothing to make it clear what you are trying to do without someone spending a fair amount of time just decoding it, and that's after they get it to compile. Your simple terms don't really help. There are no "borders" in your code either as QFrame objects or QSS styles.

The "borders" you are complaining about appear to be the inter-widget gaps that show the underlying widget's colour. If child widgets are overlapping then that is a certain sign that something is wrong with the layouts; but I don't see overlapping widgets. I do see that you have set the inter widget spacing in both layouts to one pixel, which would easily explain not seeing the underlying widget through the gap. I see that you are trying to force the size of certain widgets, leaving the layout engine with no option but to do something awkward.

BTW: Your code uses vLay uninitialized. Your code leaks QDesktopWidget memory.

Here is my take on what you are trying to achieve.

Qt Code:

Switch view

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    ServerWin = new QWidget(this);
    ServerWin->setObjectName("ServerWin");
    QRect geom = QApplication::desktop()->availableGeometry();
    geom.adjust(0, 0, -MIN_WIDTH_FACTOR, -MIN_HEIGHT_FACTOR);
    ServerWin->setMinimumSize(geom.size());
 
    MainWin = new QWidget(this);
    MainWin->setObjectName("MainWin");
 
    DispWin = new QWidget(this);
    DispWin->setObjectName("DispWin");
 
    LogWin = new QWidget(this);
    LogWin->setObjectName("LogWin");
    LogWin->setMinimumHeight(LOGWINDOW_HEIGHT);
    LogWin->setMaximumHeight(LOGWINDOW_HEIGHT);
    LogWin->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 
    KeyWin = new QWidget(this);
    KeyWin->setObjectName("KeyWin");
    KeyWin->setMinimumWidth(KEYPAD_WIDTH);
    KeyWin->setMaximumWidth(KEYPAD_WIDTH);
    KeyWin->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred);
 
 
    QVBoxLayout *vLayout = new QVBoxLayout(this);
    vLayout->addWidget(DispWin);
    vLayout->addWidget(LogWin);
    MainWin->setLayout(vLayout);
 
    QHBoxLayout *hLayout = new QHBoxLayout(this);
    hLayout->addWidget(MainWin);
    hLayout->addWidget(KeyWin);
    ServerWin->setLayout(hLayout);
 
    setCentralWidget(ServerWin);
 
    setStyleSheet(
        "#ServerWin { background: navy; }"
        "#MainWin   { background: cyan; }"
        "#DispWin   { background: lavender; }"
        "#LogWin    { background: darkviolet; }"
        "#KeyWin    { background: violet; }"
    );
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    ServerWin = new QWidget(this);
    ServerWin->setObjectName("ServerWin");
    QRect geom = QApplication::desktop()->availableGeometry();
    geom.adjust(0, 0, -MIN_WIDTH_FACTOR, -MIN_HEIGHT_FACTOR);
    ServerWin->setMinimumSize(geom.size());

    MainWin = new QWidget(this);
    MainWin->setObjectName("MainWin");

    DispWin = new QWidget(this);
    DispWin->setObjectName("DispWin");

    LogWin = new QWidget(this);
    LogWin->setObjectName("LogWin");
    LogWin->setMinimumHeight(LOGWINDOW_HEIGHT);
    LogWin->setMaximumHeight(LOGWINDOW_HEIGHT);
    LogWin->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);

    KeyWin = new QWidget(this);
    KeyWin->setObjectName("KeyWin");
    KeyWin->setMinimumWidth(KEYPAD_WIDTH);
    KeyWin->setMaximumWidth(KEYPAD_WIDTH);
    KeyWin->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred);


    QVBoxLayout *vLayout = new QVBoxLayout(this);
    vLayout->addWidget(DispWin);
    vLayout->addWidget(LogWin);
    MainWin->setLayout(vLayout);

    QHBoxLayout *hLayout = new QHBoxLayout(this);
    hLayout->addWidget(MainWin);
    hLayout->addWidget(KeyWin);
    ServerWin->setLayout(hLayout);

    setCentralWidget(ServerWin);

    setStyleSheet(
        "#ServerWin { background: navy; }"
        "#MainWin   { background: cyan; }"
        "#DispWin   { background: lavender; }"
        "#LogWin    { background: darkviolet; }"
        "#KeyWin    { background: violet; }"
    );
}

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There are better ways to get a border on a lot of widgets (not bare QWidgets though).

**anda_skoa** · 29th October 2013, 07:56

Btw, the desktop widget is usually acquired through QApplication::desktop()

Cheers,
_

**PstdEr** · 29th October 2013, 09:11

Originally Posted by ChrisW67

Your code does nothing to make it clear what you are trying to do without someone spending a fair amount of time just decoding it, and that's after they get it to compile. Your simple terms don't really help. There are no "borders" in your code either as QFrame objects or QSS styles.
The "borders" you are complaining about appear to be the inter-widget gaps that show the underlying widget's colour.

Really sorry about that, i am not a frequent coder in Qt and dont know the basics.

Originally Posted by ChrisW67

BTW: Your code uses vLay uninitialized. Your code leaks QDesktopWidget memory.

Thanks for pointing, i could have used normal object instead of pointer

And thanks a lot, Its really beautiful after your changes are applied.

Added after 9 minutes:

I have a doubt here, is it the correct way of doing , because it gives a warning when running
" QLayout: Attempting to add QLayout "" to MainWindow "", which already has a layout "
this ( mainwindow) is already having a layout and we are again trying to set one more layout.

Originally Posted by ChrisW67

QVBoxLayout *vLayout = new QVBoxLayout(this);
QHBoxLayout *hLayout = new QHBoxLayout(this);

**anda_skoa** · 29th October 2013, 12:37

Just create the layouts without parent.

Providing a parent is equivalent to calling parent->setLayout(), but QMainWindow already has a layout.

Cheers,
_

**PstdEr** · 29th October 2013, 12:46

Sorry one more question, I dont have any where else to go

.

I am using the following code to display external applications onto DispWin of previous application by passing its width and height.

The problem is after displaying the external app , if i maximize the window of main application , the external app does not resize to DispWin size, it stays same as when its displayed.

is there any thing i am doing wrong from below.

If you have time , please have a look ...

Qt Code:

Switch view

int create_window(int width, int height)
{
     XSetWindowAttributes xswa;
     static int resx, resy;
     mDisplay = XOpenDisplay(NULL);
     if(mDisplay == NULL){
	printf("m_Display Failed");
	return 0;
     }
	mScreen = DefaultScreen(mDisplay);
 
        xswa.background_pixel=BlackPixel(mDisplay, mScreen);
        xswa.border_pixel=WhitePixel(mDisplay, mScreen);
        xswa.event_mask=ExposureMask|KeyPressMask|KeyReleaseMask|ButtonPressMask|ButtonReleaseMask|StructureNotifyMask;
        xswa.override_redirect = False;
 
        mRootWin = DefaultRootWindow(mDisplay);
        if (!(window = XCreateWindow(mDisplay, mRootWin, 0, 0, width, height, 0, 0, InputOutput, DefaultVisual(mDisplay, mScreen), 
					CWEventMask|CWBackPixel|CWBorderPixel|CWOverrideRedirect, &xswa)))
        {
                fprintf(stderr, "[x11] Failed to create window\n");
                return 0;
        }
        XMapWindow(mDisplay, window);
        while (1)
        {
                XEvent event;
                XNextEvent(mDisplay, &event);
                if (event.type==Expose)
                        break;
        }
 
 	{
                XSizeHints SizeHints;
                SizeHints.flags=PMinSize|PMaxSize|USSize;
                SizeHints.min_width = width;// does not have any effect
                SizeHints.min_height = height ;// does not have any effect
                SizeHints.max_width= width;
                SizeHints.max_height= height;
                XSetWMNormalHints(mDisplay, window, &SizeHints);
	}
 
    return 1;
 }

int create_window(int width, int height)
{
     XSetWindowAttributes xswa;
     static int resx, resy;
     mDisplay = XOpenDisplay(NULL);
     if(mDisplay == NULL){
	printf("m_Display Failed");
	return 0;
     }
	mScreen = DefaultScreen(mDisplay);

        xswa.background_pixel=BlackPixel(mDisplay, mScreen);
        xswa.border_pixel=WhitePixel(mDisplay, mScreen);
        xswa.event_mask=ExposureMask|KeyPressMask|KeyReleaseMask|ButtonPressMask|ButtonReleaseMask|StructureNotifyMask;
        xswa.override_redirect = False;

        mRootWin = DefaultRootWindow(mDisplay);
        if (!(window = XCreateWindow(mDisplay, mRootWin, 0, 0, width, height, 0, 0, InputOutput, DefaultVisual(mDisplay, mScreen), 
					CWEventMask|CWBackPixel|CWBorderPixel|CWOverrideRedirect, &xswa)))
        {
                fprintf(stderr, "[x11] Failed to create window\n");
                return 0;
        }
        XMapWindow(mDisplay, window);
        while (1)
        {
                XEvent event;
                XNextEvent(mDisplay, &event);
                if (event.type==Expose)
                        break;
        }

 	{
                XSizeHints SizeHints;
                SizeHints.flags=PMinSize|PMaxSize|USSize;
                SizeHints.min_width = width;// does not have any effect
                SizeHints.min_height = height ;// does not have any effect
                SizeHints.max_width= width;
                SizeHints.max_height= height;
                XSetWMNormalHints(mDisplay, window, &SizeHints);
	}

    return 1;
 }

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Qt Code:

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#define DEFAULT_SCENE_WIDTH 1280
#define DEFAULT_SCENE_HEIGHT 720
 
int main(int argc, char **argv)
{
 
    int width;
    int height;
    int retVal =0;
    qDebug()<<"argc"<<argc;
    for(int i= 0;i<argc;i++)
        qDebug()<<"argv["<<i<<"]= "<<argv[i];
 
    QRectF sceneRect(0,0,DEFAULT_SCENE_WIDTH,DEFAULT_SCENE_HEIGHT);
 
    QApplication app(argc, argv);
    QGraphicsScene scene;
 
    scene.setSceneRect(sceneRect);
 
    QGraphicsView *gView = new QGraphicsView(&scene);
 
    QWebView *wView = new QWebView();
    wView->load(QUrl("http://127.0.0.1/setting.html"));
    wView->grabKeyboard();
 
    WId wid;
    if(argc < 2)
    {
    	printf("pass window arg\n");
	return 0;    
    }
        wid = app.arguments()[1].toInt();
        embed = new QWidget();
        QVBoxLayout* vl = new QVBoxLayout();
        embed->setLayout(vl);
        vl->addWidget(wView);
        embed->show();
 
        width = app.arguments()[2].toInt();
        height = app.arguments()[3].toInt();
        embed->setMinimumSize(width,height);
        embed->setSizePolicy(QSizePolicy::Preferred,QSizePolicy::Preferred);
 
        qDebug()<<"width & height received:"<<width<<"&"<<height;
 
        retVal = create_window(width,height);
        if (0==retVal){
            qDebug()<<"create_window failed";
            return 0;
	}
 
	XReparentWindow(mDisplay,embed->winId(),window,0,0);
	XReparentWindow(mDisplay,window,wid,0,0);
	XFlush(mDisplay);			
        app.exec();
}

#define DEFAULT_SCENE_WIDTH 1280
#define DEFAULT_SCENE_HEIGHT 720

int main(int argc, char **argv)
{

    int width;
    int height;
    int retVal =0;
    qDebug()<<"argc"<<argc;
    for(int i= 0;i<argc;i++)
        qDebug()<<"argv["<<i<<"]= "<<argv[i];

    QRectF sceneRect(0,0,DEFAULT_SCENE_WIDTH,DEFAULT_SCENE_HEIGHT);

    QApplication app(argc, argv);
    QGraphicsScene scene;

    scene.setSceneRect(sceneRect);

    QGraphicsView *gView = new QGraphicsView(&scene);

    QWebView *wView = new QWebView();
    wView->load(QUrl("http://127.0.0.1/setting.html"));
    wView->grabKeyboard();

    WId wid;
    if(argc < 2)
    {
    	printf("pass window arg\n");
	return 0;    
    }
        wid = app.arguments()[1].toInt();
        embed = new QWidget();
        QVBoxLayout* vl = new QVBoxLayout();
        embed->setLayout(vl);
        vl->addWidget(wView);
        embed->show();

        width = app.arguments()[2].toInt();
        height = app.arguments()[3].toInt();
        embed->setMinimumSize(width,height);
        embed->setSizePolicy(QSizePolicy::Preferred,QSizePolicy::Preferred);

        qDebug()<<"width & height received:"<<width<<"&"<<height;

        retVal = create_window(width,height);
        if (0==retVal){
            qDebug()<<"create_window failed";
            return 0;
	}
		
	XReparentWindow(mDisplay,embed->winId(),window,0,0);
	XReparentWindow(mDisplay,window,wid,0,0);
	XFlush(mDisplay);			
        app.exec();
}

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