chaco.tools.select_tool module¶
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class
chaco.tools.select_tool.
SelectTool
(component=None, **traits)¶ Bases:
enable.base_tool.BaseTool
Base class for tools that handle some level of click-to-select interaction. Handles the logic of different kinds of selection modes. Subclasses only need to implement a few concrete methods to handle actual selection/deselection.
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multiselect_modifier
= Instance( …¶ The modifier key to use to multi-select points. Only used in toggle and multi selection modes.
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normal_left_down
(event)¶ Handles the left mouse button being pressed when the tool is in the ‘normal’ state.
If selecting is enabled and the cursor is within threshold of a data point, the method calls the subclass’s _select” or _deselect methods to perform the appropriate action, given the current selection_mode.
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selection_mode
= Enum("toggle", "multi", "single", "off")¶ How selections are handled:
- “toggle”
The user clicks on points (while optionally holding down a modifier key) to select or deselect them. If the point is already selected, clicking it again deselects it. The modifier key to use is set by multiselect_modifier. The only way to deselect points is by clicking on them; clicking on a screen space outside of the plot does not deselect points.
- “multi”
Like toggle mode, except that the user can deselect all points at once by clicking on the plot area away from a point.
- “single”
The user can only select a single point at a time.
- “off”
The user cannot select points via clicking.
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threshold
= Float(5.0)¶ The threshold, in pixels, around the cursor location to search for points.
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