Allow adding layers which aren't open in the project to processing

parameters which accept lists of multiple layers

E.g. build vrt alg, merge vector layers alg

Otherwise you may need to load 100's of layers temporarily into
a project to perform algs on them

python/plugins/processing/gui/MultipleInputDialog.py

@@ -29,12 +29,16 @@
 
 import os
 
-from qgis.core import QgsSettings
+from qgis.core import (QgsSettings,
+                       QgsProcessing,
+                       QgsVectorFileWriter,
+                       QgsProviderRegistry)
 from qgis.PyQt import uic
 from qgis.PyQt.QtCore import Qt
 from qgis.PyQt.QtCore import QByteArray
-from qgis.PyQt.QtWidgets import QDialog, QAbstractItemView, QPushButton, QDialogButtonBox
+from qgis.PyQt.QtWidgets import QDialog, QAbstractItemView, QPushButton, QDialogButtonBox, QFileDialog
 from qgis.PyQt.QtGui import QStandardItemModel, QStandardItem
+from processing.tools import dataobjects
 
 pluginPath = os.path.split(os.path.dirname(__file__))[0]
 WIDGET, BASE = uic.loadUiType(
@@ -43,9 +47,11 @@
 
 class MultipleInputDialog(BASE, WIDGET):
 
-    def __init__(self, options, selectedoptions=None):
+    def __init__(self, options, selectedoptions=None, datatype=None):
         super(MultipleInputDialog, self).__init__(None)
         self.setupUi(self)
+        self.datatype = datatype
+        self.model = None
 
         self.lstLayers.setSelectionMode(QAbstractItemView.NoSelection)
 
@@ -68,6 +74,11 @@ def __init__(self, options, selectedoptions=None):
         self.btnToggleSelection = QPushButton(self.tr('Toggle selection'))
         self.buttonBox.addButton(self.btnToggleSelection,
                                  QDialogButtonBox.ActionRole)
+        if self.datatype is not None:
+            btnAddFile = QPushButton(self.tr('Add file(s)…'))
+            btnAddFile.clicked.connect(self.addFiles)
+            self.buttonBox.addButton(btnAddFile,
+                                     QDialogButtonBox.ActionRole)
 
         self.btnSelectAll.clicked.connect(lambda: self.selectAll(True))
         self.btnClearSelection.clicked.connect(lambda: self.selectAll(False))
@@ -83,15 +94,23 @@ def saveWindowGeometry(self):
         self.settings.setValue("/Processing/multipleInputDialogGeometry", self.saveGeometry())
 
     def populateList(self):
-        model = QStandardItemModel()
+        self.model = QStandardItemModel()
         for value, text in self.options:
             item = QStandardItem(text)
             item.setData(value, Qt.UserRole)
             item.setCheckState(Qt.Checked if value in self.selectedoptions else Qt.Unchecked)
             item.setCheckable(True)
-            model.appendRow(item)
+            self.model.appendRow(item)
 
-        self.lstLayers.setModel(model)
+        # add extra options (e.g. manually added layers)
+        for t in [o for o in self.selectedoptions if not isinstance(o, int)]:
+            item = QStandardItem(t)
+            item.setData(t, Qt.UserRole)
+            item.setCheckState(Qt.Checked)
+            item.setCheckable(True)
+            self.model.appendRow(item)
+
+        self.lstLayers.setModel(self.model)
 
     def accept(self):
         self.selectedoptions = []
@@ -118,3 +137,38 @@ def toggleSelection(self):
             item = model.item(i)
             checked = item.checkState() == Qt.Checked
             item.setCheckState(Qt.Unchecked if checked else Qt.Checked)
+
+    def getFileFilter(self, datatype):
+        """
+        Returns a suitable file filter pattern for the specified parameter definition
+        :param param:
+        :return:
+        """
+        if datatype == QgsProcessing.TypeRaster:
+            return QgsProviderRegistry.instance().fileRasterFilters()
+        elif datatype == QgsProcessing.TypeFile:
+            return self.tr('All files (*.*)')
+        else:
+            exts = QgsVectorFileWriter.supportedFormatExtensions()
+            for i in range(len(exts)):
+                exts[i] = self.tr('{0} files (*.{1})').format(exts[i].upper(), exts[i].lower())
+            return self.tr('All files (*.*)') + ';;' + ';;'.join(exts)
+
+    def addFiles(self):
+        filter = self.getFileFilter(self.datatype)
+
+        settings = QgsSettings()
+        path = str(settings.value('/Processing/LastInputPath'))
+
+        ret, selected_filter = QFileDialog.getOpenFileNames(self, self.tr('Select file(s)'),
+                                                            path, filter)
+        if ret:
+            files = list(ret)
+            settings.setValue('/Processing/LastInputPath',
+                              os.path.dirname(str(files[0])))
+            for filename in files:
+                item = QStandardItem(filename)
+                item.setData(filename, Qt.UserRole)
+                item.setCheckState(Qt.Checked)
+                item.setCheckable(True)
+                self.model.appendRow(item)

python/plugins/processing/gui/MultipleInputPanel.py

@@ -28,9 +28,10 @@
 
 import os
 
+from qgis.core import QgsProcessing
 from qgis.PyQt import uic
 from qgis.PyQt.QtCore import pyqtSignal
-
+''
 from processing.gui.MultipleInputDialog import MultipleInputDialog
 from processing.gui.MultipleFileInputDialog import MultipleFileInputDialog
 
@@ -63,10 +64,10 @@ def setSelectedItems(self, selected):
             self.tr('{0} elements selected').format(len(self.selectedoptions)))
 
     def showSelectionDialog(self):
-        if self.datatype is None:
-            dlg = MultipleInputDialog(self.options, self.selectedoptions)
-        else:
+        if self.datatype == QgsProcessing.TypeFile:
             dlg = MultipleFileInputDialog(self.selectedoptions)
+        else:
+            dlg = MultipleInputDialog(self.options, self.selectedoptions, datatype=self.datatype)
         dlg.exec_()
         if dlg.selectedoptions is not None:
             self.selectedoptions = dlg.selectedoptions
@@ -76,12 +77,15 @@ def showSelectionDialog(self):
 
     def updateForOptions(self, options):
         selectedoptions = []
-        selected = [self.options[i] for i in self.selectedoptions]
+        selected = [self.options[i] if isinstance(i, int) else i for i in self.selectedoptions]
         for sel in selected:
-            try:
-                idx = options.index(sel)
-                selectedoptions.append(idx)
-            except ValueError:
-                pass
+            if isinstance(sel, int):
+                try:
+                    idx = options.index(sel)
+                    selectedoptions.append(idx)
+                except ValueError:
+                    pass
+            else:
+                selectedoptions.append(sel)
         self.options = options
         self.setSelectedItems(selectedoptions)

python/plugins/processing/gui/wrappers.py

@@ -546,7 +546,7 @@ def _getOptions(self):
     def createWidget(self):
         if self.dialogType == DIALOG_STANDARD:
             if self.param.layerType() == QgsProcessing.TypeFile:
-                return MultipleInputPanel(datatype=dataobjects.TYPE_FILE)
+                return MultipleInputPanel(datatype=QgsProcessing.TypeFile)
             else:
                 if self.param.layerType() == QgsProcessing.TypeRaster:
                     options = QgsProcessingUtils.compatibleRasterLayers(QgsProject.instance(), False)
@@ -555,7 +555,7 @@ def createWidget(self):
                 else:
                     options = QgsProcessingUtils.compatibleVectorLayers(QgsProject.instance(), [self.param.layerType()], False)
                 opts = [getExtendedLayerName(opt) for opt in options]
-                return MultipleInputPanel(opts)
+                return MultipleInputPanel(opts, datatype=self.param.layerType())
         elif self.dialogType == DIALOG_BATCH:
             widget = BatchInputSelectionPanel(self.param, self.row, self.col, self.dialog)
             widget.valueChanged.connect(lambda: self.widgetValueHasChanged.emit(self))
@@ -599,7 +599,7 @@ def value(self):
                     options = QgsProcessingUtils.compatibleVectorLayers(QgsProject.instance(), [], False)
                 else:
                     options = QgsProcessingUtils.compatibleVectorLayers(QgsProject.instance(), [self.param.layerType()], False)
-                return [options[i] for i in self.widget.selectedoptions]
+                return [options[i] if isinstance(i, int) else i for i in self.widget.selectedoptions]
         elif self.dialogType == DIALOG_BATCH:
             return self.widget.getText()
         else: