Merge branch 'delaynotebook' into devel

- closes #1142

tests_notebook.ipynb

@@ -16,6 +16,7 @@
    "outputs": [],
    "source": [
     "from functools import partial\n",
+    "from time import sleep\n",
     "\n",
     "from tqdm.notebook import tqdm_notebook\n",
     "from tqdm.notebook import tnrange\n",
@@ -36,7 +37,7 @@
      "text": [
       "Help on function display in module tqdm.notebook:\n",
       "\n",
-      "display(self, msg=None, pos=None, close=False, bar_style=None)\n",
+      "display(self, msg=None, pos=None, close=False, bar_style=None, check_delay=True)\n",
       "    Use `self.sp` to display `msg` in the specified `pos`.\n",
       "    \n",
       "    Consider overloading this function when inheriting to use e.g.:\n",
@@ -450,6 +451,44 @@
     "    print(t)\n",
     "    assert t.colour == 'yellow'"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 18,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# NBVAL_TEST_NAME: delay no trigger\n",
+    "with tqdm_notebook(total=1, delay=10) as t:\n",
+    "    t.update()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 19,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "application/vnd.jupyter.widget-view+json": {
+       "model_id": "fe102eedbb4f437783fbd0cff32f6613",
+       "version_major": 2,
+       "version_minor": 0
+      },
+      "text/plain": [
+       "100%|##########| 1/1 [00:00<00:00,  7.68it/s]"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
+   "source": [
+    "# NBVAL_TEST_NAME: delay trigger\n",
+    "with tqdm_notebook(total=1, delay=0.1) as t:\n",
+    "    sleep(0.1)\n",
+    "    t.update()"
+   ]
   }
  ],
  "metadata": {

tqdm/notebook.py

@@ -145,7 +145,7 @@ def status_printer(_, total=None, desc=None, ncols=None):
 
     def display(self, msg=None, pos=None,
                 # additional signals
-                close=False, bar_style=None):
+                close=False, bar_style=None, check_delay=True):
         # Note: contrary to native tqdm, msg='' does NOT clear bar
         # goal is to keep all infos if error happens so user knows
         # at which iteration the loop failed.
@@ -190,6 +190,10 @@ def display(self, msg=None, pos=None,
             except AttributeError:
                 self.container.visible = False
 
+        if check_delay and self.delay > 0 and not self.displayed:
+            display(self.container)
+            self.displayed = True
+
     @property
     def colour(self):
         if hasattr(self, 'container'):
@@ -234,14 +238,16 @@ def __init__(self, *args, **kwargs):
         total = self.total * unit_scale if self.total else self.total
         self.container = self.status_printer(self.fp, total, self.desc, self.ncols)
         self.container.pbar = self
-        if display_here:
+        self.displayed = False
+        if display_here and self.delay <= 0:
             display(self.container)
+            self.displayed = True
         self.disp = self.display
         self.colour = colour
 
         # Print initial bar state
         if not self.disable:
-            self.display()
+            self.display(check_delay=False)
 
     def __iter__(self):
         try:
@@ -268,16 +274,18 @@ def update(self, n=1):
         # since this could be a shared bar which the user will `reset()`
 
     def close(self):
+        if self.disable:
+            return
         super(tqdm_notebook, self).close()
         # Try to detect if there was an error or KeyboardInterrupt
         # in manual mode: if n < total, things probably got wrong
         if self.total and self.n < self.total:
-            self.disp(bar_style='danger')
+            self.disp(bar_style='danger', check_delay=False)
         else:
             if self.leave:
-                self.disp(bar_style='success')
+                self.disp(bar_style='success', check_delay=False)
             else:
-                self.disp(close=True)
+                self.disp(close=True, check_delay=False)
 
     def clear(self, *_, **__):
         pass