# guiqwt.signals

In guiqwt version 2, the signals module used to contain constants defining the custom Qt SIGNAL objects used by guiqwt: the signals definition were gathered here to avoid misspelling signals at connect and emit sites (with old-style signals, any misspelled signal string would have lead to a silent failure of signal emission or connection).

Since version 3, to ensure PyQt5 compatibility, guiqwt is using only new-style signals and slots.

However, all signals are summarized below, in order to facilitate migration from guiqwt v2 to guiqwt v3.

Signals available:
  `guiqwt.baseplot.BasePlot.SIG_ITEM_MOVED`

    Emitted by plot when an IBasePlotItem-like object was moved from (x0, y0) to (x1, y1)

    Arguments: item object, old_x, old_y, new_x, new_y

  `guiqwt.baseplot.BasePlot.SIG_ITEM_HANDLE_MOVED`

    Emitted by plot when an IBasePlotItem-like object handle was moved

    Arguments: item object

  `guiqwt.baseplot.BasePlot.SIG_MARKER_CHANGED`

    Emitted by plot when a guiqwt.shapes.Marker position changes

    Arguments: guiqwt.shapes.Marker object

  `guiqwt.baseplot.BasePlot.SIG_AXES_CHANGED`

    Emitted by plot when a guiqwt.shapes.Axes position (or angle) changes

    Arguments: guiqwt.shapes.Axes object

  `guiqwt.baseplot.BasePlot.SIG_ANNOTATION_CHANGED`

    Emitted by plot when an annotations.AnnotatedShape position changes

    Arguments: annotation item

  `guiqwt.baseplot.BasePlot.SIG_RANGE_CHANGED`

    Emitted by plot when a shapes.XRangeSelection range changes

    Arguments: range object, lower_bound, upper_bound

  `guiqwt.baseplot.BasePlot.SIG_ITEMS_CHANGED`

    Emitted by plot when item list has changed (item removed, added, …)

    Arguments: plot

  `guiqwt.baseplot.BasePlot.SIG_ACTIVE_ITEM_CHANGED`

    Emitted by plot when selected item has changed

    Arguments: plot

  `guiqwt.baseplot.BasePlot.SIG_ITEM_REMOVED`

    Emitted by plot when an item was deleted from the itemlist or using the delete item tool

    Arguments: removed item

  `guiqwt.baseplot.BasePlot.SIG_ITEM_SELECTION_CHANGED`

    Emitted by plot when an item is selected

    Arguments: plot

  `guiqwt.baseplot.BasePlot.SIG_PLOT_LABELS_CHANGED`

    Emitted (by plot) when plot’s title or any axis label has changed

    Arguments: plot

  `guiqwt.baseplot.BasePlot.SIG_AXIS_DIRECTION_CHANGED`

    Emitted (by plot) when any plot axis direction has changed

    Arguments: plot

  `guiqwt.histogram.LevelsHistogram.SIG_VOI_CHANGED`

    Emitted by “contrast” panel’s histogram when the lut range of some items changed (for now, this signal is for guiqwt.histogram module’s internal use only - the ‘public’ counterpart of this signal is SIG_LUT_CHANGED, see below)

  `guiqwt.baseplot.BasePlot.SIG_LUT_CHANGED`

    Emitted by plot when LUT has been changed by the user

    Arguments: plot

  `guiqwt.baseplot.BasePlot.SIG_MASK_CHANGED`

    Emitted by plot when image mask has changed

    Arguments: MaskedImageItem object

  `guiqwt.baseplot.BasePlot.SIG_CS_CURVE_CHANGED`

    Emitted by cross section plot when cross section curve data has changed

    Arguments: plot

  `guiqwt.panels.PanelWidget.SIG_VISIBILITY_CHANGED`

    Emitted for example by panels when their visibility has changed

    Arguments: state (boolean)

  `guiqwt.tools.InteractiveTool.SIG_VALIDATE_TOOL`

    Emitted by an interactive tool to notify that the tool has just been “validated”, i.e. <ENTER>, <RETURN> or <SPACE> was pressed

    Arguments: filter

  `guiqwt.tools.InteractiveTool.SIG_TOOL_JOB_FINISHED`

    Emitted by an interactive tool to notify that it is finished doing its job

  `guiqwt.tools.OpenFileTool.SIG_OPEN_FILE`

    Emitted by an open file tool

  `guiqwt.tools.ImageMaskTool.SIG_APPLIED_MASK_TOOL`

    Emitted by the ImageMaskTool when applying the shape-defined mask