Class: QgsMapCanvasTracer¶
-
class
qgis.gui.
QgsMapCanvasTracer
(canvas: QgsMapCanvas, messageBar: QgsMessageBar = None)¶ Bases:
QgsTracer
Create tracer associated with a particular map canvas, optionally message bar for reporting
Extension of
QgsTracer
that provides extra functionality: - automatic updates of own configuration based on canvas settings - reporting of issues to the user via message bar - determines whether tracing is currently enabled by the userA simple registry of tracer instances associated to map canvas instances is kept for convenience. (Map tools do not need to create their local tracer instances and map canvas API is not “polluted” by this optional functionality).
New in version 2.14.
- Parameters
canvas (QgsMapCanvas) –
messageBar –
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actionEnableSnapping
(self) → QAction¶ Access to action that user may use to toggle snapping on/off. May be null if no action was associated.
New in version 3.0.
- Return type
QAction
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actionEnableTracing
(self) → QAction¶ Access to action that user may use to toggle tracing on/off. May be null if no action was associated
- Return type
QAction
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childEvent
()¶
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configure
(self)¶ Sets configuration from current snapping settings and canvas settings
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connectNotify
()¶
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customEvent
()¶
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disconnectNotify
()¶
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invalidateGraph
()¶
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isSignalConnected
()¶
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receivers
()¶
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reportError
(self, err: QgsTracer.PathError, addingVertex: bool)¶ Report a path finding error to the user
- Parameters
err (QgsTracer.PathError) –
addingVertex (bool) –
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sender
()¶
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senderSignalIndex
()¶
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setActionEnableSnapping
(self, action: QAction)¶ Assign “enable snapping” checkable action to the tracer. The action is used to determine whether snapping is currently enabled by the user.
New in version 3.0.
- Parameters
action (QAction) –
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setActionEnableTracing
(self, action: QAction)¶ Assign “enable tracing” checkable action to the tracer. The action is used to determine whether tracing is currently enabled by the user
- Parameters
action (QAction) –
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timerEvent
()¶
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tracerForCanvas
(canvas: QgsMapCanvas) → QgsMapCanvasTracer¶ Retrieve instance of this class associated with given canvas (if any). The class keeps a simple registry of tracers associated with map canvas instances for easier access to the common tracer by various map tools
- Parameters
canvas (QgsMapCanvas) –
- Return type