change some variable names to be more informative, add an image to error dialog

daemon/core/gui/dialogs/emaneconfig.py

@@ -65,17 +65,16 @@ class EmaneModelDialog(Dialog):
         self.model = f"emane_{model}"
         self.interface = interface
         self.config_frame = None
-        self.error = False
+        self.has_error = False
         try:
             self.config = self.app.core.get_emane_model_config(
                 self.node.id, self.model, self.interface
             )
+            self.draw()
         except grpc.RpcError as e:
             show_grpc_error(e, self.app, self.app)
-            self.error = True
+            self.has_error = True
             self.destroy()
-        if not self.error:
-            self.draw()
 
     def draw(self):
         self.top.columnconfigure(0, weight=1)
@@ -228,7 +227,7 @@ class EmaneConfigDialog(Dialog):
         dialog = EmaneModelDialog(
             self, self.app, self.canvas_node.core_node, model_name
         )
-        if not dialog.error:
+        if not dialog.has_error:
             dialog.show()
 
     def emane_model_change(self, event: tk.Event):

daemon/core/gui/dialogs/nodeservice.py

@@ -142,7 +142,7 @@ class NodeServiceDialog(Dialog):
             )
 
             # if error occurred when creating ServiceConfigDialog, don't show the dialog
-            if not dialog.error:
+            if not dialog.has_error:
                 dialog.show()
             else:
                 dialog.destroy()

daemon/core/gui/dialogs/serviceconfig.py

@@ -65,15 +65,13 @@ class ServiceConfigDialog(Dialog):
         self.temp_service_files = {}
         self.modified_files = set()
 
-        self.error = True
+        self.has_error = False
 
-        load_result = self.load()
-        if load_result:
+        self.load()
+        if not self.has_error:
             self.draw()
-            self.error = False
 
     def load(self) -> bool:
-        result = False
         try:
             self.app.core.create_nodes_and_links()
             default_config = self.app.core.get_node_service(
@@ -114,10 +112,9 @@ class ServiceConfigDialog(Dialog):
             ):
                 for file, data in file_configs[self.node_id][self.service_name].items():
                     self.temp_service_files[file] = data
-            result = True
         except grpc.RpcError as e:
+            self.has_error = True
             show_grpc_error(e, self.master, self.app)
-        return result
 
     def draw(self):
         self.top.columnconfigure(0, weight=1)

daemon/core/gui/dialogs/sessions.py

@@ -25,9 +25,9 @@ class SessionsDialog(Dialog):
         self.selected = False
         self.selected_id = None
         self.tree = None
-        self.error = False
+        self.has_error = False
         self.sessions = self.get_sessions()
-        if not self.error:
+        if not self.has_error:
             self.draw()
 
     def get_sessions(self) -> Iterable[core_pb2.SessionSummary]:
@@ -37,7 +37,7 @@ class SessionsDialog(Dialog):
             return response.sessions
         except grpc.RpcError as e:
             show_grpc_error(e, self.app, self.app)
-            self.error = True
+            self.has_error = True
             self.destroy()
 
     def draw(self):

daemon/core/gui/dialogs/wlanconfig.py

@@ -27,13 +27,13 @@ class WlanConfigDialog(Dialog):
         self.canvas_node = canvas_node
         self.node = canvas_node.core_node
         self.config_frame = None
-        self.error = False
+        self.has_error = False
         try:
             self.config = self.app.core.get_wlan_config(self.node.id)
             self.draw()
         except grpc.RpcError as e:
             show_grpc_error(e, self.app, self.app)
-            self.error = True
+            self.has_error = True
             self.destroy()
 
     def draw(self):

daemon/core/gui/errors.py

@@ -1,6 +1,8 @@
+from tkinter import ttk
 from typing import TYPE_CHECKING
 
 from core.gui.dialogs.dialog import Dialog
+from core.gui.images import ImageEnum, Images
 from core.gui.widgets import CodeText
 
 if TYPE_CHECKING:
@@ -18,10 +20,14 @@ class ErrorDialog(Dialog):
     def draw(self):
         self.top.columnconfigure(0, weight=1)
         self.top.rowconfigure(0, weight=1)
+        image = Images.get(ImageEnum.ERROR, 36)
+        label = ttk.Label(self.top, image=image)
+        label.image = image
+        label.grid(row=0, column=0)
         self.error_message = CodeText(self.top)
         self.error_message.text.insert("1.0", self.details)
         self.error_message.text.config(state="disabled")
-        self.error_message.grid(row=0, column=0, sticky="nsew")
+        self.error_message.grid(row=1, column=0, sticky="nsew")
 
 
 def show_grpc_error(e: "grpc.RpcError", master, app: "Application"):

daemon/core/gui/graph/node.py

@@ -240,7 +240,7 @@ class CanvasNode:
     def show_wlan_config(self):
         self.canvas.context = None
         dialog = WlanConfigDialog(self.app, self.app, self)
-        if not dialog.error:
+        if not dialog.has_error:
             dialog.show()
 
     def show_mobility_config(self):

daemon/core/gui/images.py

@@ -89,3 +89,4 @@ class ImageEnum(Enum):
     DELETE = "delete"
     SHUTDOWN = "shutdown"
     CANCEL = "cancel"
+    ERROR = "error"