PyQt layout question: QScrollView and QGridLayout?

[Volker Lenhardt]

For a QApplication (PyQt) on the small screen of my Zaurus 5500 PDA I
try to layout my data output in a QScrollView as the central widget. I'd
prefer to use QGridLayout, but cannot add it to the scroll view.

sc=QScrollView( self)
layout=QGridLay out(..., sc.viewport())
sc.addChild(lay out)

results in a TypeError.

Is there a way to get it to work? Filling a box viewport with lots of
padding boxes and white space labels to establish grids is very
cumbersome. And I need 4 different layouts to change places.

Best wishes
Volker

--
Volker Lenhardt
E-Mail: volker.lenhardt @uni-duisburg-essen.de

[Phil Thompson]

Re: PyQt layout question: QScrollView and QGridLayout?

On Thursday 17 November 2005 2:56 pm, Volker Lenhardt wrote:[color=blue]
> For a QApplication (PyQt) on the small screen of my Zaurus 5500 PDA I
> try to layout my data output in a QScrollView as the central widget. I'd
> prefer to use QGridLayout, but cannot add it to the scroll view.
>
> sc=QScrollView( self)
> layout=QGridLay out(..., sc.viewport())
> sc.addChild(lay out)
>
> results in a TypeError.
>
> Is there a way to get it to work? Filling a box viewport with lots of
> padding boxes and white space labels to establish grids is very
> cumbersome. And I need 4 different layouts to change places.[/color]

QGridLayout is not a sub-class of QWidget, which is what addChild() is
expecting. You probably want QGrid.

Phil

[Phil Thompson]

Re: PyQt layout question: QScrollView and QGridLayout?

On Thursday 17 November 2005 2:56 pm, Volker Lenhardt wrote:[color=blue]
> For a QApplication (PyQt) on the small screen of my Zaurus 5500 PDA I
> try to layout my data output in a QScrollView as the central widget. I'd
> prefer to use QGridLayout, but cannot add it to the scroll view.
>
> sc=QScrollView( self)
> layout=QGridLay out(..., sc.viewport())
> sc.addChild(lay out)
>
> results in a TypeError.
>
> Is there a way to get it to work? Filling a box viewport with lots of
> padding boxes and white space labels to establish grids is very
> cumbersome. And I need 4 different layouts to change places.[/color]

QGridLayout is not a sub-class of QWidget, which is what addChild() is
expecting. You probably want QGrid.

Phil

[Volker Lenhardt]

Re: PyQt layout question: QScrollView and QGridLayout?

Phil Thompson schrieb:[color=blue]
> On Thursday 17 November 2005 2:56 pm, Volker Lenhardt wrote:
>[color=green]
>>prefer to use QGridLayout, but cannot add it to the scroll view.
>>
>>sc=QScrollVie w(self)
>>layout=QGridL ayout(..., sc.viewport())
>>sc.addChild(l ayout)
>>
>>results in a TypeError.
>>
>>Is there a way to get it to work? Filling a box viewport with lots of
>>padding boxes and white space labels to establish grids is very
>>cumbersome. And I need 4 different layouts to change places.[/color]
>
>
> QGridLayout is not a sub-class of QWidget, which is what addChild() is
> expecting. You probably want QGrid.
>
> Phil[/color]

I hoped to find a more assuring answer. There's no MultiCellWidget , no
Col/RowStretching, no Col/RowSpacing in QGrid. I've got to patch up one
VBox with a whole bunch of QV/QHBoxes and QGrids not to mention the
white space QLabels to fill not used grid cells.

And I have to delete all of them to change to another data layout.

Are you sure that there's no way to fill a QScrollView with the help of
some QLayout?

Still hopefully
Volker

[Volker Lenhardt]

Re: PyQt layout question: QScrollView and QGridLayout?

Phil Thompson schrieb:[color=blue]
> On Thursday 17 November 2005 2:56 pm, Volker Lenhardt wrote:
>[color=green]
>>prefer to use QGridLayout, but cannot add it to the scroll view.
>>
>>sc=QScrollVie w(self)
>>layout=QGridL ayout(..., sc.viewport())
>>sc.addChild(l ayout)
>>
>>results in a TypeError.
>>
>>Is there a way to get it to work? Filling a box viewport with lots of
>>padding boxes and white space labels to establish grids is very
>>cumbersome. And I need 4 different layouts to change places.[/color]
>
>
> QGridLayout is not a sub-class of QWidget, which is what addChild() is
> expecting. You probably want QGrid.
>
> Phil[/color]

I hoped to find a more assuring answer. There's no MultiCellWidget , no
Col/RowStretching, no Col/RowSpacing in QGrid. I've got to patch up one
VBox with a whole bunch of QV/QHBoxes and QGrids not to mention the
white space QLabels to fill not used grid cells.

And I have to delete all of them to change to another data layout.

Are you sure that there's no way to fill a QScrollView with the help of
some QLayout?

Still hopefully
Volker

[dwelch]

Re: PyQt layout question: QScrollView and QGridLayout?

Volker Lenhardt wrote:[color=blue]
> Phil Thompson schrieb:
>[color=green]
>> On Thursday 17 November 2005 2:56 pm, Volker Lenhardt wrote:
>>[color=darkred]
>>> prefer to use QGridLayout, but cannot add it to the scroll view.
>>>
>>> sc=QScrollView( self)
>>> layout=QGridLay out(..., sc.viewport())
>>> sc.addChild(lay out)
>>>
>>> results in a TypeError.
>>>
>>> Is there a way to get it to work? Filling a box viewport with lots of
>>> padding boxes and white space labels to establish grids is very
>>> cumbersome. And I need 4 different layouts to change places.[/color]
>>
>>
>>
>> QGridLayout is not a sub-class of QWidget, which is what addChild() is
>> expecting. You probably want QGrid.
>>
>> Phil[/color]
>
>
> I hoped to find a more assuring answer. There's no MultiCellWidget , no
> Col/RowStretching, no Col/RowSpacing in QGrid. I've got to patch up one
> VBox with a whole bunch of QV/QHBoxes and QGrids not to mention the
> white space QLabels to fill not used grid cells.
>
> And I have to delete all of them to change to another data layout.
>
> Are you sure that there's no way to fill a QScrollView with the help of
> some QLayout?
>
> Still hopefully
> Volker[/color]

I _think_ I have code that does waht you want. This creates multiple
layouts that contain an icon, a button, and some text on a scrollview.
The code is awkward and ugly, but it works.


class ScrollToolView( QScrollView):
def __init__(self,p arent = None,name = None,fl = 0):
QScrollView.__i nit__(self,pare nt,name,fl)
self.items = {}
self.setStaticB ackground(True)
self.enableClip per(True)

self.viewport() .setPaletteBack groundColor(qAp p.palette().col or(QPalette.Act ive,
QColorGroup.Bac kground))
self.row_height = 120

def viewportResizeE vent(self, e):
for x in self.items:
self.items[x].resize(e.size( ).width(), self.row_height )

def addItem(self, name, title, pix, text, button_text, button_func):
num_items = len(self.items)
LayoutWidget = QWidget(self.vi ewport(),"layou twidget")
LayoutWidget.se tSizePolicy(QSi zePolicy(QSizeP olicy.Expanding ,
QSizePolicy.Min imum))
LayoutWidget.se tGeometry(QRect (0, 0, self.width(),
self.row_height ))
self.addChild(L ayoutWidget)

if num_items:
self.moveChild( LayoutWidget, 0, self.row_height *num_items)

layout = QGridLayout(Lay outWidget,1,1,1 0,10,"layout")

pushButton = QPushButton(Lay outWidget,"push Button")

pushButton.setS izePolicy(QSize Policy(QSizePol icy.Maximum,QSi zePolicy.Fixed, 0,0,

pushButton.size Policy().hasHei ghtForWidth()))
self.connect(pu shButton,SIGNAL ("clicked()" ), button_func)

layout.addWidge t(pushButton,2, 2)

textLabel = QLabel(LayoutWi dget,"textLabel ")

layout.addWidge t(textLabel,1,1 )

pixmap = QLabel(LayoutWi dget,"pixmapLab el2")

pixmap.setSizeP olicy(QSizePoli cy(QSizePolicy. Fixed,QSizePoli cy.Fixed,0,0,
pixmap.sizePoli cy().hasHeightF orWidth()))
pixmap.setMinim umSize(QSize(32 ,32))
pixmap.setMaxim umSize(QSize(32 ,32))
pixmap.setPixma p(pix)
pixmap.setScale dContents(1)

layout.addWidge t(pixmap,1,0)

textLabel2 = QLabel(LayoutWi dget,"textLabel 2")
textLabel2.setA lignment(QLabel .WordBreak | QLabel.AlignTop )

textLabel2.setS izePolicy(QSize Policy(QSizePol icy.Minimum,QSi zePolicy.Expand ing))

layout.addWidge t(textLabel2,2, 1)

if num_items:
line = QFrame(LayoutWi dget,"line")
line.setFrameSh adow(QFrame.Sun ken)
line.setFrameSh ape(QFrame.HLin e)
layout.addMulti CellWidget(line ,0,0,0,2)

textLabel.setTe xt(title)
textLabel2.setT ext(text)
pushButton.setT ext(button_text )
self.resizeCont ents(self.width (), num_items*self. row_height*2)

LayoutWidget.sh ow()

try:
self.items[name]
except KeyError:
self.items[name] = LayoutWidget
else:
print "ERROR: Duplicate button name:", name

def clear(self):
if len(self.items) :
for x in self.items:
self.removeChil d(self.items[x])
self.items[x].hide()

self.items.clea r()
self.resizeCont ents(self.width (), 0)



-Don

[dwelch]

Re: PyQt layout question: QScrollView and QGridLayout?

Volker Lenhardt wrote:[color=blue]
> Phil Thompson schrieb:
>[color=green]
>> On Thursday 17 November 2005 2:56 pm, Volker Lenhardt wrote:
>>[color=darkred]
>>> prefer to use QGridLayout, but cannot add it to the scroll view.
>>>
>>> sc=QScrollView( self)
>>> layout=QGridLay out(..., sc.viewport())
>>> sc.addChild(lay out)
>>>
>>> results in a TypeError.
>>>
>>> Is there a way to get it to work? Filling a box viewport with lots of
>>> padding boxes and white space labels to establish grids is very
>>> cumbersome. And I need 4 different layouts to change places.[/color]
>>
>>
>>
>> QGridLayout is not a sub-class of QWidget, which is what addChild() is
>> expecting. You probably want QGrid.
>>
>> Phil[/color]
>
>
> I hoped to find a more assuring answer. There's no MultiCellWidget , no
> Col/RowStretching, no Col/RowSpacing in QGrid. I've got to patch up one
> VBox with a whole bunch of QV/QHBoxes and QGrids not to mention the
> white space QLabels to fill not used grid cells.
>
> And I have to delete all of them to change to another data layout.
>
> Are you sure that there's no way to fill a QScrollView with the help of
> some QLayout?
>
> Still hopefully
> Volker[/color]

I _think_ I have code that does waht you want. This creates multiple
layouts that contain an icon, a button, and some text on a scrollview.
The code is awkward and ugly, but it works.


class ScrollToolView( QScrollView):
def __init__(self,p arent = None,name = None,fl = 0):
QScrollView.__i nit__(self,pare nt,name,fl)
self.items = {}
self.setStaticB ackground(True)
self.enableClip per(True)

self.viewport() .setPaletteBack groundColor(qAp p.palette().col or(QPalette.Act ive,
QColorGroup.Bac kground))
self.row_height = 120

def viewportResizeE vent(self, e):
for x in self.items:
self.items[x].resize(e.size( ).width(), self.row_height )

def addItem(self, name, title, pix, text, button_text, button_func):
num_items = len(self.items)
LayoutWidget = QWidget(self.vi ewport(),"layou twidget")
LayoutWidget.se tSizePolicy(QSi zePolicy(QSizeP olicy.Expanding ,
QSizePolicy.Min imum))
LayoutWidget.se tGeometry(QRect (0, 0, self.width(),
self.row_height ))
self.addChild(L ayoutWidget)

if num_items:
self.moveChild( LayoutWidget, 0, self.row_height *num_items)

layout = QGridLayout(Lay outWidget,1,1,1 0,10,"layout")

pushButton = QPushButton(Lay outWidget,"push Button")

pushButton.setS izePolicy(QSize Policy(QSizePol icy.Maximum,QSi zePolicy.Fixed, 0,0,

pushButton.size Policy().hasHei ghtForWidth()))
self.connect(pu shButton,SIGNAL ("clicked()" ), button_func)

layout.addWidge t(pushButton,2, 2)

textLabel = QLabel(LayoutWi dget,"textLabel ")

layout.addWidge t(textLabel,1,1 )

pixmap = QLabel(LayoutWi dget,"pixmapLab el2")

pixmap.setSizeP olicy(QSizePoli cy(QSizePolicy. Fixed,QSizePoli cy.Fixed,0,0,
pixmap.sizePoli cy().hasHeightF orWidth()))
pixmap.setMinim umSize(QSize(32 ,32))
pixmap.setMaxim umSize(QSize(32 ,32))
pixmap.setPixma p(pix)
pixmap.setScale dContents(1)

layout.addWidge t(pixmap,1,0)

textLabel2 = QLabel(LayoutWi dget,"textLabel 2")
textLabel2.setA lignment(QLabel .WordBreak | QLabel.AlignTop )

textLabel2.setS izePolicy(QSize Policy(QSizePol icy.Minimum,QSi zePolicy.Expand ing))

layout.addWidge t(textLabel2,2, 1)

if num_items:
line = QFrame(LayoutWi dget,"line")
line.setFrameSh adow(QFrame.Sun ken)
line.setFrameSh ape(QFrame.HLin e)
layout.addMulti CellWidget(line ,0,0,0,2)

textLabel.setTe xt(title)
textLabel2.setT ext(text)
pushButton.setT ext(button_text )
self.resizeCont ents(self.width (), num_items*self. row_height*2)

LayoutWidget.sh ow()

try:
self.items[name]
except KeyError:
self.items[name] = LayoutWidget
else:
print "ERROR: Duplicate button name:", name

def clear(self):
if len(self.items) :
for x in self.items:
self.removeChil d(self.items[x])
self.items[x].hide()

self.items.clea r()
self.resizeCont ents(self.width (), 0)



-Don

[David Boddie]

Re: PyQt layout question: QScrollView and QGridLayout?

Volker Lenhardt wrote:[color=blue]
> Phil Thompson schrieb:[color=green]
> > On Thursday 17 November 2005 2:56 pm, Volker Lenhardt wrote:[/color][/color]

[Using a QGridLayout in a QScrollView]
[color=blue][color=green][color=darkred]
> >>Is there a way to get it to work? Filling a box viewport with lots of
> >>padding boxes and white space labels to establish grids is very
> >>cumbersome. And I need 4 different layouts to change places.[/color]
> >
> > QGridLayout is not a sub-class of QWidget, which is what addChild() is
> > expecting. You probably want QGrid.[/color]
>
> I hoped to find a more assuring answer. There's no MultiCellWidget , no
> Col/RowStretching, no Col/RowSpacing in QGrid. I've got to patch up one
> VBox with a whole bunch of QV/QHBoxes and QGrids not to mention the
> white space QLabels to fill not used grid cells.[/color]

You can still use QGridLayout, but you need to put a widget into the
QScrollView in what the documentation describes as "Using One Big
Widget" (http://doc.trolltech.com/3.3/qscrollview.html).

Something along these lines should do basically what you want:

sv = QScrollView()
w = QWidget(sv.view port())
sv.addChild(w)

grid = QGridLayout(w, 3, 3)

for i in range(0,3):
for j in range(0,3):
grid.addWidget( QLabel("(%i,%i) " % (i,j), w), i, j)

Of course, the widget that contains the layout is only as large as it
needs to be, so you may need to call its setMinimumSize( ) method if
you want it to be larger. However, it's often a better idea to ensure
that the child widgets have the sizes they need - their parent will
then be as large as they require.

Hope this helps,

David

[David Boddie]

Re: PyQt layout question: QScrollView and QGridLayout?

Volker Lenhardt wrote:[color=blue]
> Phil Thompson schrieb:[color=green]
> > On Thursday 17 November 2005 2:56 pm, Volker Lenhardt wrote:[/color][/color]

[Using a QGridLayout in a QScrollView]
[color=blue][color=green][color=darkred]
> >>Is there a way to get it to work? Filling a box viewport with lots of
> >>padding boxes and white space labels to establish grids is very
> >>cumbersome. And I need 4 different layouts to change places.[/color]
> >
> > QGridLayout is not a sub-class of QWidget, which is what addChild() is
> > expecting. You probably want QGrid.[/color]
>
> I hoped to find a more assuring answer. There's no MultiCellWidget , no
> Col/RowStretching, no Col/RowSpacing in QGrid. I've got to patch up one
> VBox with a whole bunch of QV/QHBoxes and QGrids not to mention the
> white space QLabels to fill not used grid cells.[/color]

You can still use QGridLayout, but you need to put a widget into the
QScrollView in what the documentation describes as "Using One Big
Widget" (http://doc.trolltech.com/3.3/qscrollview.html).

Something along these lines should do basically what you want:

sv = QScrollView()
w = QWidget(sv.view port())
sv.addChild(w)

grid = QGridLayout(w, 3, 3)

for i in range(0,3):
for j in range(0,3):
grid.addWidget( QLabel("(%i,%i) " % (i,j), w), i, j)

Of course, the widget that contains the layout is only as large as it
needs to be, so you may need to call its setMinimumSize( ) method if
you want it to be larger. However, it's often a better idea to ensure
that the child widgets have the sizes they need - their parent will
then be as large as they require.

Hope this helps,

David

[Volker Lenhardt]

Re: PyQt layout question: QScrollView and QGridLayout?

Thank you Don, thank you David,

I was convinced that there must be a simple solution at hand. A dummy
widget!

It does work to my needs. Don's ScrollToolView is very interesting
though not yet the right tool for my actual application, but I've got
some more ideas for long winter nights ...

All the best
Volker

[Volker Lenhardt]

Re: PyQt layout question: QScrollView and QGridLayout?

Thank you Don, thank you David,

I was convinced that there must be a simple solution at hand. A dummy
widget!

It does work to my needs. Don's ScrollToolView is very interesting
though not yet the right tool for my actual application, but I've got
some more ideas for long winter nights ...

All the best
Volker