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Squish/Enumerating all Objects Matching a Pattern: Difference between revisions
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== Enumerating all objects matching a pattern == | == Enumerating all objects matching a pattern == | ||
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When using Squish's pattern lookup functionality, it is often useful to perform an operation on all occurrences of an object matching a Squish pattern. The following function will let you enumerate all occurrences matching a pattern like you would any Python collection: | When using Squish's pattern lookup functionality, it is often useful to perform an operation on all occurrences of an object matching a Squish pattern. The following function will let you enumerate all occurrences matching a pattern like you would any Python collection: | ||
This function will yield all of the objects matching the specified pattern, by occurrence unless an alternative field to enumerate is provided with '%i' as its value. | This function will yield all of the objects matching the specified pattern, by occurrence unless an alternative field to enumerate is provided with '%i' as its value. | ||
<code>def enumerateObjects(pattern): | |||
#allow %i to be specified manually, e.g. to check rows in a model one could do | |||
#enumerateObjects("{column='0' container=':containerObject' row='%i' type='QModelIndex'}") | |||
if '%i' not in pattern: | |||
if not pattern.endswith('}'): #invalid pattern | |||
raise RuntimeError("Pattern 's' is invalid!" pattern) | |||
pattern = pattern[:–1] + " occurrence='i'}" | |||
i = 1 | |||
while True: | |||
try: | |||
#return objects until a LookupError occurs | |||
yield findObject(pattern i) | |||
except: | |||
return | |||
i += 1 | |||
</code> | |||
As a usage example, to log the contents of all '''QLabel''' widgets with parent :foo, you would do: | As a usage example, to log the contents of all '''QLabel''' widgets with parent :foo, you would do: | ||
<code>for label in enumerateObjects("{type='QLabel' parent=':foo'}"): | |||
test.log(str(label.text())) |
Latest revision as of 08:37, 25 November 2017
Enumerating all objects matching a pattern
When using Squish's pattern lookup functionality, it is often useful to perform an operation on all occurrences of an object matching a Squish pattern. The following function will let you enumerate all occurrences matching a pattern like you would any Python collection:
This function will yield all of the objects matching the specified pattern, by occurrence unless an alternative field to enumerate is provided with '%i' as its value.
def enumerateObjects(pattern):
#allow %i to be specified manually, e.g. to check rows in a model one could do
#enumerateObjects("{column='0' container=':containerObject' row='%i' type='QModelIndex'}")
if '%i' not in pattern:
if not pattern.endswith('}'): #invalid pattern
raise RuntimeError("Pattern 's' is invalid!" pattern)
pattern = pattern[:–1] + " occurrence='i'}"
i = 1
while True:
try:
#return objects until a LookupError occurs
yield findObject(pattern i)
except:
return
i += 1
As a usage example, to log the contents of all QLabel widgets with parent :foo, you would do:
for label in enumerateObjects("{type='QLabel' parent=':foo'}"):
test.log(str(label.text()))