Subgroup: Locator
Class: QgsLocatorFilter¶
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class
qgis.core.
QgsLocatorFilter
(parent: QObject = None)¶ Bases:
PyQt5.QtCore.QObject
Constructor for QgsLocatorFilter.
Abstract base class for filters which collect locator results.
Note
If the configuration of the filter is changed outside of the main application settings, one needs to invalidate current results of the locator widget: see QgisInterface.invalidateLocatorResults
New in version 3.0: Methods
activePrefix
Returns the prefix in use in the locator is entered. childEvent
clearPreviousResults
This method will be called on main thread on the original filter (not a clone) before fetching results or before triggering a result to clear any change made by a former call to triggerResult. clone
Creates a clone of the filter. connectNotify
customEvent
disconnectNotify
displayName
Returns a translated, user-friendly name for the filter. enabled
Returns true if the filter is enabled. fetchResults
Retrieves the filter results for a specified search string
.flags
Returns flags which specify the filter’s behavior. hasConfigWidget
Should return true if the filter has a configuration widget. isSignalConnected
logMessage
Logs a message
to the log panelname
Returns the unique name for the filter. openConfigWidget
Opens the configuration widget for the filter (if it has one), with the specified parent
widget.prefix
Returns the search prefix character(s) for this filter. prepare
Prepares the filter instance for an upcoming search for the specified string
.priority
Returns the priority for the filter, which controls how results are ordered in the locator. receivers
sender
senderSignalIndex
setEnabled
Sets whether the filter is enabled
.setUseWithoutPrefix
Sets whether the filter should be used when no prefix is entered. stringMatches
Tests a candidate
string to see if it should be considered a match for a specifiedsearch
string.timerEvent
triggerResult
Triggers a filter result
from this filter.useWithoutPrefix
Returns true if the filter should be used when no prefix is entered. Signals
finished
Emitted when the filter finishes fetching results. resultFetched
Should be emitted by filters whenever they encounter a matching result during within their fetchResults() implementation. Attributes
FlagFast
High
Highest
Low
Lowest
Medium
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class
Flag
¶ Bases:
int
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FlagFast
= 2¶
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class
Flags
¶ Bases:
sip.wrapper
QgsLocatorFilter.Flags(Union[QgsLocatorFilter.Flags, QgsLocatorFilter.Flag]) QgsLocatorFilter.Flags(QgsLocatorFilter.Flags)
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baseClass
¶ alias of
QgsLocatorFilter
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-
High
= 1¶
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Highest
= 0¶
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Low
= 3¶
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Lowest
= 4¶
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Medium
= 2¶
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class
Priority
¶ Bases:
int
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baseClass
¶ alias of
QgsLocatorFilter
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activePrefix
(self) → str¶ Returns the prefix in use in the locator is entered.
See also
setActivePrefix()
New in version 3.2.
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childEvent
()¶
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clearPreviousResults
(self)¶ This method will be called on main thread on the original filter (not a clone) before fetching results or before triggering a result to clear any change made by a former call to triggerResult. For instance, this can be used to remove any on-canvas rubber bands which have been created when a previous search result was triggered.
New in version 3.2.
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clone
(self) → QgsLocatorFilter¶ Creates a clone of the filter. New requests are always executed in a clone of the original filter.
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connectNotify
()¶
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customEvent
()¶
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disconnectNotify
()¶
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enabled
(self) → bool¶ Returns true if the filter is enabled.
See also
-
fetchResults
(self, string: str, context: QgsLocatorContext, feedback: QgsFeedback)¶ Retrieves the filter results for a specified search
string
. Thecontext
argument encapsulates the context relating to the search (such as a map extent to prioritize).Implementations of fetchResults() should emit the resultFetched() signal whenever they encounter a matching result.
Subclasses should periodically check the
feedback
object to determine whether the query has been canceled. If so, the subclass should return from this method as soon as possible.This will be called from a background thread unless flags() returns the QgsLocatorFilter.FlagFast flag.
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finished
¶ Emitted when the filter finishes fetching results. [signal]
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flags
(self) → QgsLocatorFilter.Flags¶ Returns flags which specify the filter’s behavior.
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hasConfigWidget
(self) → bool¶ Should return true if the filter has a configuration widget.
See also
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isSignalConnected
()¶
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logMessage
(self, message: str, level: Qgis.MessageLevel = Qgis.Info)¶ Logs a
message
to the log panelWarning
in Python, do not use print() method as it might result in crashes since fetching results does not happen in the main thread.
New in version 3.2.
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name
(self) → str¶ Returns the unique name for the filter. This should be an untranslated string identifying the filter.
See also
-
openConfigWidget
(self, parent: QWidget = None)¶ Opens the configuration widget for the filter (if it has one), with the specified
parent
widget. The base class implementation does nothing. Subclasses can override this to show their own custom configuration widget.Note
hasConfigWidget() must return true to indicate that the filter supports configuration.
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prefix
(self) → str¶ Returns the search prefix character(s) for this filter. Prefix a search with these characters will restrict the locator search to only include results from this filter.
Note
Plugins are not permitted to utilize prefixes with < 3 characters, as these are reserved for core QGIS functions. If a plugin registers a filter with a prefix shorter than 3 characters then the prefix will be ignored.
Note
Prefixes might be overridden by user preferences.
See also
-
prepare
(self, string: str, context: QgsLocatorContext)¶ Prepares the filter instance for an upcoming search for the specified
string
. This method is always called from the main thread, and individual filter subclasses should perform whatever tasks are required in order to allow a subsequent search to safely execute on a background thread.
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priority
(self) → QgsLocatorFilter.Priority¶ Returns the priority for the filter, which controls how results are ordered in the locator.
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receivers
()¶
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resultFetched
¶ Should be emitted by filters whenever they encounter a matching result during within their fetchResults() implementation. [signal]
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sender
()¶
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senderSignalIndex
()¶
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setUseWithoutPrefix
(self, useWithoutPrefix: bool)¶ Sets whether the filter should be used when no prefix is entered.
See also
-
stringMatches
(candidate: str, search: str) → bool¶ Tests a
candidate
string to see if it should be considered a match for a specifiedsearch
string. Filter subclasses should use this method when comparing strings instead of directly using QString.contains() or Python ‘in’ checks.
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timerEvent
()¶
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triggerResult
(self, result: QgsLocatorResult)¶ Triggers a filter
result
from this filter. This is called when one of the results obtained by a call to fetchResults() is triggered by a user. The filter subclass must implement logic here to perform the desired operation for the search result. E.g. a file search filter would open file associated with the triggered result.
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useWithoutPrefix
(self) → bool¶ Returns true if the filter should be used when no prefix is entered.
See also
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class