Stuff Nobody Told Me About: 2012

2012/05/28

Pesky Etching

While working with Qt buttons I've came across a very nasty behaviour - when you disable a button, it's label receives a pretty ugly shadow that makes the font rather unreadable. This effect is called 'etching'. There is a reminant of a CSS property that controls that behaviour called etch-disabled-text, but it's undocumented and actually doesn't work at all.

There is NO documented way of removing that shadow. Pretty crappy, especially for a very configurable toolkit like Qt.

Anyways, here's a workaround. It'll set the proper global palette rules that will apply this fix to all the buttons.
The first line sets the color of the disabled text, the second - removes the etching.

	QPalette pal = QApplication::palette();
	pal.setColor(QPalette::Disabled, QPalette::Text, QColor(80, 80, 80));
	pal.setColor(QPalette::Disabled, QPalette::Light, QColor(0, 0, 0, 0));

	QApplication::setPalette(pal);

view raw etching.cpp hosted with ❤ by GitHub

2012/01/22

OATMEAL2PDF

As a continuation to my wildly popular XKCD2PDF post, here's a script I whipped out to get me some sweet PDFs of a great comic called The Oatmeal.

	import re, urllib2,sys
	k = 0
	for i in range(7,0,-1):
	page_url = "http://theoatmeal.com/comics_pg/page:%d"%i
	out = open("oatmeal\\out%d.html"%i,"w")
	out.write("<html><body>\n")
	print "getting " + page_url
	f = urllib2.urlopen(page_url)
	a = f.read()
	results = []
	for params in re.findall("""<a href="/comics/(.?)"><img src="(.?)" alt="(.*?)" class="border0" /></a>""",a):
	title = params[2]
	sub_url = "http://theoatmeal.com/comics/" + params[0]
	print "getting " + sub_url
	try:
	sf = urllib2.urlopen(sub_url)
	except:
	print "Unexpected error:", sys.exc_info()[0]
	continue
	sa = sf.read()

	r1 = re.findall('"(http://s3.amazonaws.com/theoatmeal-img/comics/.*?)"',sa,re.S)
	result = {
	'title' : title,
	'sub_images' : r1
	}
	if len(result['sub_images'])==0:
	print "crap"
	else:
	results += [ result ]
	print result

	results.reverse()

	for result in results:
	out.write("<hr/>\n")
	out.write(result['title'] + "<br/>\n")
	for si in result['sub_images']:
	print "getting " + si
	try:
	u = urllib2.urlopen(si)
	except:
	print "Unexpected error:", sys.exc_info()[0]
	continue
	fn = 'oatmeal\\%d.%s'%(k,si[-3:])
	k += 1
	localFile = open(fn, 'wb')
	localFile.write(u.read())
	localFile.close()
	out.write("<img src=\"%s\"/> <br/>\n"%fn)
	out.flush()


	out.write("</body></html>\n");
	out.close()

view raw oatmeal.py hosted with ❤ by GitHub

2012/01/03

SCons and Qt Resource files

Today I've stumbled upon a bug/problem with SCons' support for Qt resource files (the ones with QRC extension).
Usually, to add a QRC to your project you add a line like this:

qrcobj = programEnv.Qrc("SomeFile.qrc", QT4_QRCFLAGS="-name SomeFile")

and all is well.
But - probably due to a bug somewhere in qt4.py module, the files that are referenced from inside the QRC (the actual images and stylesheets) are not added as a dependency to the build process, so when you change a CSS file, the QRC will not be rebuilt.
The snippet below parses the QRC manually, fetches the list of files inside and adds the to deps list; Python rocks.

	#adding qrc resources compilation
	import xml.dom.minidom

	qtResourceFile = []
	for q in ("GUI.qrc", "UI/UI.qrc",):
	baseq = os.path.basename(q)[:-4]
	qrcdeps = []
	qrc = programEnv['ENV']['PWD'] + "/GUI/" + q
	dir = os.path.dirname(qrc)
	x = xml.dom.minidom.parse(open(qrc))
	for filenode in x.getElementsByTagName("file"):
	qrcdeps += [ dir + "/" + filenode.childNodes[0].data ]
	qrcobj = programEnv.Qrc(q, QT4_QRCFLAGS="-name "+baseq)
	programEnv.Depends(qrcobj, qrcdeps)
	qtResourceFile += [ qrcobj ]

view raw qrc scons support.py hosted with ❤ by GitHub

Stuff Nobody Told Me About