From ec37d1c411e69ff77c36c72f84729add124a7c3f Mon Sep 17 00:00:00 2001
From: Mika Fischer <fischer@videmo.de>
Date: Thu, 16 Jun 2011 20:17:33 +0200
Subject: [PATCH] Synchronize selections between Scene and TreeView (closes
 #18)

---
 sloth/annotations/model.py   | 23 +++++++++++++++++++----
 sloth/gui/annotationscene.py | 16 ++++++++++++++++
 sloth/gui/labeltool.py       |  5 +++++
 3 files changed, 40 insertions(+), 4 deletions(-)

diff --git a/sloth/annotations/model.py b/sloth/annotations/model.py
index 1ce0687..36d3e35 100644
--- a/sloth/annotations/model.py
+++ b/sloth/annotations/model.py
@@ -1,7 +1,7 @@
 """
 The annotationmodel module contains the classes for the AnnotationModel.
 """
-from PyQt4.QtGui import QTreeView, QSortFilterProxyModel, QAbstractItemView
+from PyQt4.QtGui import QTreeView, QItemSelection, QItemSelectionModel, QSortFilterProxyModel, QAbstractItemView
 from PyQt4.QtCore import QModelIndex, QPersistentModelIndex, QAbstractItemModel, QVariant, Qt, pyqtSignal
 import os.path
 import copy
@@ -505,15 +505,17 @@ class AnnotationSortFilterProxyModel(QSortFilterProxyModel):
 #######################################################################################
 
 class AnnotationTreeView(QTreeView):
+    selectedItemsChanged = pyqtSignal(object)
+
     def __init__(self, parent=None):
         super(AnnotationTreeView, self).__init__(parent)
 
         self.setUniformRowHeights(True)
-        self.setSelectionMode(QTreeView.SingleSelection)
+        self.setSelectionMode(QTreeView.ExtendedSelection)
         self.setSelectionBehavior(QTreeView.SelectItems)
         self.setAllColumnsShowFocus(True)
         self.setAlternatingRowColors(True)
-        self.setEditTriggers(QAbstractItemView.SelectedClicked)
+        #self.setEditTriggers(QAbstractItemView.SelectedClicked)
         self.setSortingEnabled(True)
         self.expanded.connect(self.onExpanded)
 
@@ -539,4 +541,17 @@ class AnnotationTreeView(QTreeView):
     def rowsInserted(self, index, start, end):
         QTreeView.rowsInserted(self, index, start, end)
         self.resizeColumns()
-#        self.setCurrentIndex(index.child(end, 0))
+
+    def setSelectedItems(self, items):
+        block = self.blockSignals(True)
+        sel = QItemSelection()
+        for item in items:
+            sel.merge(QItemSelection(item.index(), item.index()), QItemSelectionModel.SelectCurrent)
+        self.selectionModel().clear()
+        self.selectionModel().select(sel, QItemSelectionModel.Select)
+        self.blockSignals(block)
+
+    def selectionChanged(self, selected, deselected):
+        items = [ self.model().itemFromIndex(index) for index in self.selectionModel().selectedIndexes()]
+        self.selectedItemsChanged.emit(items)
+        QTreeView.selectionChanged(self, selected, deselected)
diff --git a/sloth/gui/annotationscene.py b/sloth/gui/annotationscene.py
index 383bb56..c429e79 100644
--- a/sloth/gui/annotationscene.py
+++ b/sloth/gui/annotationscene.py
@@ -52,6 +52,7 @@ class AnnotationScene(QGraphicsScene):
             self.disconnect(self.model_, SIGNAL('rowsAboutToBeRemoved(QModelIndex,int,int)'), self.rowsAboutToBeRemoved)
             self.disconnect(self.model_, SIGNAL('rowsRemoved(QModelIndex,int,int)'), self.rowsRemoved)
             self.disconnect(self.model_, SIGNAL('modelReset()'), self.reset)
+
         self.model_ = model
 
         # connect new signals
@@ -178,6 +179,21 @@ class AnnotationScene(QGraphicsScene):
             # selection mode
             QGraphicsScene.mouseMoveEvent(self, event)
 
+
+    def onSelectionChanged(self):
+        model_items = [item.modelItem() for item in self.selectedItems()]
+        self.labeltool_.treeview().setSelectedItems(model_items)
+
+    def onSelectionChangedInTreeView(self, items):
+        block = self.blockSignals(True)
+        items = [self.itemFromIndex(item.index()) for item in items]
+        for item in self.items():
+            item.setSelected(False)
+        for item in items:
+            if item is not None:
+                item.setSelected(True)
+        self.blockSignals(block)
+
     #
     # key event handlers
     #______________________________________________________________________________________________________
diff --git a/sloth/gui/labeltool.py b/sloth/gui/labeltool.py
index c6a431f..4b32688 100755
--- a/sloth/gui/labeltool.py
+++ b/sloth/gui/labeltool.py
@@ -47,6 +47,8 @@ class MainWindow(QMainWindow):
             self.setWindowTitle("%s - Unnamed[*]" % APP_NAME)
         self.treeview.setModel(self.labeltool.model())
         self.scene.setModel(self.labeltool.model())
+        self.selectionmodel = QItemSelectionModel(self.labeltool.model())
+        self.treeview.setSelectionModel(self.selectionmodel)
         self.treeview.selectionModel().currentChanged.connect(self.labeltool.setCurrentImage)
 
     def onCurrentImageChanged(self, index):
@@ -119,6 +121,9 @@ class MainWindow(QMainWindow):
         self.treeview.setSizePolicy(QSizePolicy.MinimumExpanding, QSizePolicy.Preferred)
         self.ui.dockInformation.setWidget(self.treeview)
 
+        self.scene.selectionChanged.connect(self.scene.onSelectionChanged)
+        self.treeview.selectedItemsChanged.connect(self.scene.onSelectionChangedInTreeView)
+
         # Show the UI.  It is important that this comes *after* the above 
         # adding of custom widgets, especially the central widget.  Otherwise the
         # dock widgets would be far to large.