2

VERSION QGIS 2.1x

i realize plugins to do this actions without use toolbar: copy features / paste to layer / merge selected features => define attribute to use in merge.

So, all is okay but i don't find "merge selected features" in PyQt action or others like :

qgis.utils.iface. ???

What is good expression to call "merge selected features" enter image description here action / button ?
All of this actions are in advanced digitize toolbar.

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  • Try combine geometry of selected features. – DIV Dec 1 '17 at 17:56
  • Combine is one of solution but no attributes selection, just geometry combination. no ? – Gaet Dec 2 '17 at 12:11
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NOTE: The whole answer is for QGIS v3.x (currently v2.99).

Copy Features / Paste to layer

These functions are now available in QGIS master (v2.99) and will be included in QGIS v3.0. You can use them from your plugin in this way:

self.iface.copySelectionToClipboard(source_layer) # A prior selection is expected

target_layer.startEditing()
self.iface.pasteFromClipboard(target_layer)
target_layer.commitChanges()

Merge

As of now, merge functionality is not exposed through the QGIS Python bindings. However, you could do one of the following:

  1. Port C++ code to Python. For instance, I've done that partially (except attribute handling) in a new plugin I'm developing. See merge-boundaries function.

  2. Trigger QGIS Merge Selected Features action. Locate the merge selected features action (button) and trigger it:

    iface.mainWindow().findChild(QAction, 'mActionMergeFeatureAttributes').trigger()
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  • Good news ! This new functionnality allows to select what attributes use to merge ? – Gaet Dec 2 '17 at 11:51
  • to Trigger QGIS Merge Selected Features action i need to import QAction in my plugin python script. – Gaet Dec 2 '17 at 12:07
  • Do you know why my edit features à not save when à trigger : self.iface.mainWindow().findChild(QAction, 'mActionSaveEdits').trigger() self.iface.mainWindow().findChild(QAction, 'mActionToggleEditing').trigger() – Gaet Dec 4 '17 at 8:45
  • You have methods in iface to access those actions, e.g., actionSaveActiveLayerEdits(), actionSaveAllEdits(), actionSaveEdits(), actionToggleEditing(). Do they work for you? – Germán Carrillo Dec 4 '17 at 14:26
  • i'd already try actionToggleEditing() after trigger actionSaveEdits() and just layer.commitChanges() work... – Gaet Dec 4 '17 at 15:34
1

Chosen solution :

Trigger QGIS Merge Selected Features action. Locate the merge selected features action (button) and trigger it:

This code need to work with QAction

from PyQt4.QtGui import QAction

self.iface.mainWindow().findChild(QAction, 'mActionMergeFeature').trigger()

To trigger "Merge selected features" from plugin script without click on button.

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