status bar messages to indicate rendering and viewing progress

cq_editor/main_window.py

@@ -1,6 +1,9 @@
 import sys
 
-from PyQt5.QtWidgets import (QLabel, QMainWindow, QToolBar, QDockWidget, QAction)
+from typing import Optional
+from PyQt5.QtCore import pyqtSlot, Qt
+from PyQt5.QtGui import QPalette, QColor
+from PyQt5.QtWidgets import (QLabel, QMainWindow, QToolBar, QDockWidget, QAction, QApplication)
 
 import cadquery as cq
 
@@ -55,6 +58,8 @@ def __init__(self,parent=None):
         self.restoreWindow()
         self.restoreComponentState()
 
+        self.on_idle()
+
     def closeEvent(self,event):
 
         self.saveWindow()
@@ -192,7 +197,7 @@ def prepare_toolbar(self):
         self.toolbar = QToolBar('Main toolbar',self,objectName='Main toolbar')
 
         for c in self.components.values():
-            add_actions(self.toolbar,c.toolbarActions())
+            add_actions(self.toolbar, c.toolbarActions())
 
         self.addToolBar(self.toolbar)
 
@@ -203,18 +208,25 @@ def prepare_statusbar(self):
 
     def prepare_actions(self):
 
+        self.components['debugger'].sigRenderStarted \
+            .connect(self.on_render_start)
         self.components['debugger'].sigRendered\
             .connect(self.components['object_tree'].addObjects)
         self.components['debugger'].sigTraceback\
             .connect(self.components['traceback_viewer'].addTraceback)
+        self.components['debugger'].sigRendered \
+            .connect(lambda _: self.on_idle())
+        self.components['debugger'].sigTraceback \
+            .connect(lambda _: self.on_idle())
+
         self.components['debugger'].sigLocals\
             .connect(self.components['variables_viewer'].update_frame)
         self.components['debugger'].sigLocals\
             .connect(self.components['console'].push_vars)
 
-        self.components['object_tree'].sigObjectsAdded[list]\
-            .connect(self.components['viewer'].display_many)
-        self.components['object_tree'].sigObjectsAdded[list,bool]\
+        self.components['object_tree'].sigObjectsAdded[list, list]\
+            .connect(lambda objects, names: self.components['viewer'].display_many(objects, None, names))
+        self.components['object_tree'].sigObjectsAdded[list, bool, list]\
             .connect(self.components['viewer'].display_many)
         self.components['object_tree'].sigItemChanged.\
             connect(self.components['viewer'].update_item)
@@ -229,6 +241,8 @@ def prepare_actions(self):
 
         self.components['viewer'].sigObjectSelected\
             .connect(self.components['object_tree'].handleGraphicalSelection)
+        self.components['viewer'].sigDisplayProgress \
+            .connect(self.on_display_progress)
 
         self.components['traceback_viewer'].sigHighlightLine\
             .connect(self.components['editor'].go_to_line)
@@ -332,6 +346,25 @@ def handle_filename_change(self, fname):
         new_title = fname if fname else "*"
         self.setWindowTitle(f"{self.name}: {new_title}")
 
-if __name__ == "__main__":
+    def on_idle(self):
+        self.set_status_message('Idle', '#000000')
 
-    pass
+    @pyqtSlot()
+    def on_render_start(self):
+        self.set_status_message('Rendering...', '#ff0000')
+
+    @pyqtSlot(int, int, str)
+    def on_display_progress(self, current: int, total: int, name: Optional[str]):
+        if current == total:
+            self.on_idle()
+        else:
+            message = f'Displaying Shape {current + 1} / {total}'
+            if name:
+                message += f' ({name})'
+            self.set_status_message(message, '#0000ff')
+
+    def set_status_message(self, message: str, color: str):
+        self.statusBar().showMessage(message)
+        self.statusBar().setStyleSheet(f'color: {color}')
+        # required because rendering is currently done on the main thread
+        QApplication.processEvents()

cq_editor/widgets/debugger.py

@@ -110,6 +110,7 @@ class Debugger(QObject,ComponentMixin):
         {'name': 'Change working dir to script dir','type': 'bool', 'value': True}])
 
 
+    sigRenderStarted = pyqtSignal()
     sigRendered = pyqtSignal(dict)
     sigLocals = pyqtSignal(dict)
     sigTraceback = pyqtSignal(object,str)
@@ -221,6 +222,7 @@ def _cleanup_locals(self,module,injected_names):
 
     @pyqtSlot(bool)
     def render(self):
+        self.sigRenderStarted.emit()
 
         if self.preferences['Reload CQ']:
             reload_cq()

cq_editor/widgets/object_tree.py

@@ -91,7 +91,7 @@ class ObjectTree(QWidget,ComponentMixin):
         {'name': 'Clear all before each run', 'type': 'bool', 'value': True},
         {'name': 'STL precision','type': 'float', 'value': .1}])
 
-    sigObjectsAdded = pyqtSignal([list],[list,bool])
+    sigObjectsAdded = pyqtSignal([list, list],[list, bool, list])
     sigObjectsRemoved = pyqtSignal(list)
     sigCQObjectSelected = pyqtSignal(object)
     sigAISObjectsSelected = pyqtSignal(list)
@@ -195,6 +195,7 @@ def addLines(self):
 
         origin = (0,0,0)
         ais_list = []
+        names = []
 
         for name,color,direction in zip(('X','Y','Z'),
                                         ('red','lawngreen','blue'),
@@ -208,8 +209,9 @@ def addLines(self):
                                                  ais=line))
 
             ais_list.append(line)
+            names.append(name)
 
-        self.sigObjectsAdded.emit(ais_list)
+        self.sigObjectsAdded.emit(ais_list, names)
 
     def _current_properties(self):
 
@@ -242,6 +244,7 @@ def addObjects(self,objects,clean=False,root=None):
             self.removeObjects()
 
         ais_list = []
+        names = []
 
         #remove empty objects
         objects_f = {k:v for k,v in objects.items() if not is_obj_empty(v.shape)}
@@ -260,28 +263,29 @@ def addObjects(self,objects,clean=False,root=None):
 
             if child.properties['Visible']:
                 ais_list.append(ais)
-
+                names.append(name)
+
             root.addChild(child)
 
         if request_fit_view:
-            self.sigObjectsAdded[list,bool].emit(ais_list,True)
+            self.sigObjectsAdded[list, bool, list].emit(ais_list, True, names)
         else:
-            self.sigObjectsAdded[list].emit(ais_list)
+            self.sigObjectsAdded[list, list].emit(ais_list, names)
 
     @pyqtSlot(object,str,object)
     def addObject(self,obj,name='',options={}):
 
         root = self.CQ
 
-        ais,shape_display = make_AIS(obj, options)
+        ais, shape_display = make_AIS(obj, options)
 
         root.addChild(ObjectTreeItem(name,
                                      shape=obj,
                                      shape_display=shape_display,
                                      ais=ais,
                                      sig=self.sigObjectPropertiesChanged))
 
-        self.sigObjectsAdded.emit([ais])
+        self.sigObjectsAdded.emit([ais], name)
 
     @pyqtSlot(list)
     @pyqtSlot()
@@ -305,7 +309,7 @@ def stashObjects(self,action : bool):
             self.removeObjects()
             self.CQ.addChildren(self._stash)
             ais_list = [el.ais for el in self._stash]
-            self.sigObjectsAdded.emit(ais_list)
+            self.sigObjectsAdded.emit(ais_list, [''] * len(ais_list))
 
     @pyqtSlot()
     def removeSelected(self):

cq_editor/widgets/traceback_viewer.py

@@ -35,8 +35,7 @@ def __init__(self,parent):
 
         self.tree = TracebackTree(self)
         self.current_exception = QLabel(self)
-        self.current_exception.setStyleSheet(\
-            "QLabel {color : red; }");
+        self.current_exception.setStyleSheet("QLabel {color : red; }");
 
         layout(self,
                (self.current_exception,

cq_editor/widgets/viewer.py

@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 
+from typing import List, Optional
 from PyQt5.QtWidgets import (QWidget, QPushButton, QDialog, QTreeWidget,
                              QTreeWidgetItem, QVBoxLayout, QFileDialog,
                              QHBoxLayout, QFrame, QLabel, QApplication,
@@ -45,6 +46,7 @@ class OCCViewer(QWidget,ComponentMixin):
     IMAGE_EXTENSIONS = 'png'
 
     sigObjectSelected = pyqtSignal(list)
+    sigDisplayProgress = pyqtSignal(int, int, str)
 
     def __init__(self,parent=None):
 
@@ -140,31 +142,23 @@ def clear(self):
         context.PurgeDisplay()
         context.RemoveAll(True)
 
-    def _display(self,shape):
-
-        ais = make_AIS(shape)
-        self.canvas.context.Display(shape,True)
-
-        self.displayed_shapes.append(shape)
-        self.displayed_ais.append(ais)
-
-        #self.canvas._display.Repaint()
-
     @pyqtSlot(object)
-    def display(self,ais):
-
-        context = self._get_context()
-        context.Display(ais,True)
-
-        if self.preferences['Fit automatically']: self.fit()
+    def display(self, ais):
+        self.display_many([ais])
 
     @pyqtSlot(list)
-    @pyqtSlot(list,bool)
-    def display_many(self,ais_list,fit=None):
+    @pyqtSlot(list, bool, list)
+    def display_many(self, ais_list, fit: Optional[bool] = None, names: Optional[List] = None):
+        if names is None:
+            names = [None] * len(ais_list)
+        assert len(ais_list) == len(names)
 
         context = self._get_context()
-        for ais in ais_list:
-            context.Display(ais,True)
+        num_objects = len(ais_list)
+        for i, (ais, name) in enumerate(zip(ais_list, names)):
+            self.sigDisplayProgress.emit(i, num_objects, name)
+            context.Display(ais, True)
+        self.sigDisplayProgress.emit(num_objects, num_objects, None)
 
         if self.preferences['Fit automatically'] and fit is None:
             self.fit()
@@ -184,7 +178,8 @@ def update_item(self,item,col):
     def remove_items(self,ais_items):
 
         ctx = self._get_context()
-        for ais in ais_items: ctx.Erase(ais,True)
+        for ais in ais_items:
+            ctx.Erase(ais,True)
 
     @pyqtSlot()
     def redraw(self):