Re: [PyQt] HeightForWidth label
Dear Pete,
Thanks a lot for your input. To some extend its too bad that this
feature cannot be implemented in a proper fashion - especially when the
documentation of Qt tells you that it can.
Best regards,
Mads
On 09/01/2013 22:00, Hans-Peter Jansen wrote:
Dear Mads,
Am Mittwoch, 9. Januar 2013, 15:56:29 schrieb Mads Ipsen:
Hi,
4-5 years I needed a widget with the following properties:
* Display text incl. HTML
* Text should be wrapped on several lines
* When the widget is put into a layout, the height of the widget
should be adjusted in such a way that the text exactly fits the
widget geometry
This subwidget should be used in a layout to provide some detail on how
the other GUI elements in the layout work but only consume a minimum
space to display its content.
I thought this was an easy one - but each time I return to the challenge
I always end by giving up.
The main problem is that the layout breaks down when heightForWidth() is
implemented and a QSizePolicy with setHeightForWidth(True) is used. It
can shrink to infinitely small. Apparently this is Qt bug.
Yes, been there, done that, and failed in similar ways.
The best thing I could come up on this was:
use a QTextBrowser for the text:
self.aboutText.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.aboutText.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.aboutText.setLineWrapMode(QtGui.QTextEdit.NoWrap)
self.aboutText.setSizePolicy(QtGui.QSizePolicy.Fixed,
QtGui.QSizePolicy.Fixed)
self.aboutText.setHtml("...")
w = self.aboutText.document().idealWidth()
self.aboutText.document().setTextWidth(w)
ds = self.aboutText.document().size()
self.aboutText.setMinimumSize(int(ds.width() + 3), int(ds.height() +
3))
self.aboutText.updateGeometry()
self.layout().setSizeConstraint(QtGui.QLayout.SetFixedSize)
with this, you can even provide clickable links (but disable openLinks prop):
@QtCore.pyqtSignature("const QUrl &")
def on_aboutText_anchorClicked(self, url):
QtGui.QDesktopServices.openUrl(url)
Maybe it gets you going..
Cheers,
Pete
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+-+
| Mads Ipsen |
+--+--+
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| DK-2500 Valby| phone: +45-29716388 |
| Denmark | email: mads.ip...@gmail.com |
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Re: [PyQt] HeightForWidth label
Dear Mads,
Am Mittwoch, 9. Januar 2013, 15:56:29 schrieb Mads Ipsen:
> Hi,
>
> 4-5 years I needed a widget with the following properties:
>
> * Display text incl. HTML
> * Text should be wrapped on several lines
> * When the widget is put into a layout, the height of the widget
> should be adjusted in such a way that the text exactly fits the
> widget geometry
>
> This subwidget should be used in a layout to provide some detail on how
> the other GUI elements in the layout work but only consume a minimum
> space to display its content.
>
> I thought this was an easy one - but each time I return to the challenge
> I always end by giving up.
>
> The main problem is that the layout breaks down when heightForWidth() is
> implemented and a QSizePolicy with setHeightForWidth(True) is used. It
> can shrink to infinitely small. Apparently this is Qt bug.
Yes, been there, done that, and failed in similar ways.
The best thing I could come up on this was:
use a QTextBrowser for the text:
self.aboutText.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.aboutText.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.aboutText.setLineWrapMode(QtGui.QTextEdit.NoWrap)
self.aboutText.setSizePolicy(QtGui.QSizePolicy.Fixed,
QtGui.QSizePolicy.Fixed)
self.aboutText.setHtml("...")
w = self.aboutText.document().idealWidth()
self.aboutText.document().setTextWidth(w)
ds = self.aboutText.document().size()
self.aboutText.setMinimumSize(int(ds.width() + 3), int(ds.height() + 3))
self.aboutText.updateGeometry()
self.layout().setSizeConstraint(QtGui.QLayout.SetFixedSize)
with this, you can even provide clickable links (but disable openLinks prop):
@QtCore.pyqtSignature("const QUrl &")
def on_aboutText_anchorClicked(self, url):
QtGui.QDesktopServices.openUrl(url)
Maybe it gets you going..
Cheers,
Pete
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[PyQt] HeightForWidth label
Hi,
4-5 years I needed a widget with the following properties:
* Display text incl. HTML
* Text should be wrapped on several lines
* When the widget is put into a layout, the height of the widget
should be adjusted in such a way that the text exactly fits the
widget geometry
This subwidget should be used in a layout to provide some detail on how
the other GUI elements in the layout work but only consume a minimum
space to display its content.
I thought this was an easy one - but each time I return to the challenge
I always end by giving up.
The main problem is that the layout breaks down when heightForWidth() is
implemented and a QSizePolicy with setHeightForWidth(True) is used. It
can shrink to infinitely small. Apparently this is Qt bug.
Another approach is to call updateGeometry() when a resizeEvent() occurs
and call setFixedHeight(h) using a width dependent height. But this also
gives rise to some weird layout behavior.
If anybody has any good suggestions on how to approach this, please let
me know.
I attach a small snippet that reproduces the layout resizing behavior.
Best regards,
Mads
--
+-+
| Mads Ipsen |
+--+--+
| Gåsebæksvej 7, 4. tv | |
| DK-2500 Valby| phone: +45-29716388 |
| Denmark | email:mads.ip...@gmail.com |
+--+--+
import sys
from PyQt4 import QtCore, QtGui
class Square(QtGui.QLabel):
def __init__(self, parent=None):
QtGui.QLabel.__init__(self, parent)
self.setAutoFillBackground(True)
palette = QtGui.QPalette()
palette.setColor(QtGui.QPalette.Window, QtGui.QColor('red'))
self.setPalette(palette)
policy = self.sizePolicy()
policy.setHeightForWidth(True)
self.setSizePolicy(policy)
def sizeHint(self):
return QtCore.QSize(128, 128)
def heightForWidth(self, width):
return width
class Widget(QtGui.QWidget):
def __init__(self, parent=None):
# Call base class constructor
QtGui.QWidget.__init__(self, parent)
# Add a layout
layout = QtGui.QVBoxLayout()
self.setLayout(layout)
# Add Square
label = Square()
layout.addWidget(label)
spacerItem = QtGui.QSpacerItem(20, 40, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Expanding)
layout.addItem(spacerItem)
# Some dummy button
self._push_button = QtGui.QPushButton('Press me')
layout.addWidget(self._push_button)
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
widget = Widget()
widget.show()
sys.exit(app.exec_())
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