rename class TUI to App, change StdOutWrapper to a context manager and add idea of a main_loop() for the App class

2020-01-14 08:59:13 +01:00
parent 033cb92dc4
commit d0eabd3252
7 changed files with 186 additions and 145 deletions
--- a/docs/build/html/_modules/pylib/tui.html
+++ b/docs/build/html/_modules/pylib/tui.html
@@ -37,7 +37,7 @@
 <span class="c1"># -*- coding: utf-8 -*-</span>
 <span class="sd">&quot;&quot;&quot;TUI module.</span>

-<span class="sd">:Date: 2020-01-10</span>
+<span class="sd">:Date: 2020-01-13</span>

 <span class="sd">.. module:: tui</span>
 <span class="sd">  :platform: *nix, Windows</span>
@@ -62,43 +62,58 @@
 <div class="viewcode-block" id="StdOutWrapper"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.StdOutWrapper">[docs]</a><span class="k">class</span> <span class="nc">StdOutWrapper</span><span class="p">:</span>
  <span class="sd">&quot;&quot;&quot;Send print to stdout (print to the standard console).</span>

-<span class="sd">  usage:</span>
+<span class="sd">  :Example:</span>

 <span class="sd">  ::</span>

 <span class="sd">    # catch all prints into StdOutWrapper</span>
-<span class="sd">    mystdout = StdOutWrapper()</span>
-<span class="sd">    sys.stdout = mystdout</span>
-<span class="sd">    sys.stderr = mystdout</span>
+<span class="sd">    with StdOutWrapper() as mystdout:</span>

-<span class="sd">    # begin curses (curses.initscr())</span>
+<span class="sd">      # begin curses (curses.initscr(), ...)</span>

-<span class="sd">    # do your stuff here</span>
-<span class="sd">    # print(&quot;foo&quot;)</span>
-<span class="sd">    # you can also output mystdout.get_text() in a ncurses widget in</span>
-<span class="sd">    # runtime</span>
+<span class="sd">      # do your stuff here</span>
+<span class="sd">      # print(&quot;foo&quot;)</span>
+<span class="sd">      # you can also output mystdout.get_text() in a ncurses widget in</span>
+<span class="sd">      # runtime</span>

-<span class="sd">    # end curses (curses.endwin())</span>
+<span class="sd">      # end curses (curses.endwin())</span>

 <span class="sd">    # go back to normal state and print all catched prints to stdout</span>
-<span class="sd">    sys.stdout = sys.__stdout__</span>
-<span class="sd">    sys.stderr = sys.__stderr__</span>
-<span class="sd">    sys.stdout.write(mystdout.get_text())</span>

-<span class="sd">  source:</span>
-<span class="sd">    https://stackoverflow.com/a/14010948</span>
+
 <span class="sd">  &quot;&quot;&quot;</span>
-  <span class="n">text</span> <span class="o">=</span> <span class="s2">&quot;&quot;</span>
+  <span class="c1"># https://stackoverflow.com/a/14010948</span>
+  <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+    <span class="bp">self</span><span class="o">.</span><span class="n">text</span> <span class="o">=</span> <span class="s2">&quot;&quot;</span>
+
+  <span class="k">def</span> <span class="fm">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+    <span class="sd">&quot;&quot;&quot;catch all prints into StdOutWrapper</span>
+<span class="sd">    &quot;&quot;&quot;</span>
+    <span class="c1">#self.stdout = StdOutWrapper()</span>
+    <span class="n">sys</span><span class="o">.</span><span class="n">stdout</span> <span class="o">=</span> <span class="bp">self</span>
+    <span class="n">sys</span><span class="o">.</span><span class="n">stderr</span> <span class="o">=</span> <span class="bp">self</span>
+    <span class="k">return</span> <span class="bp">self</span>  <span class="c1"># to use as: with StdOutWrapper() as mystdout:</span>
+
+  <span class="k">def</span> <span class="fm">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">etype</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">traceback</span><span class="p">):</span>
+    <span class="sd">&quot;&quot;&quot;go back to normal state and print all catched prints to</span>
+<span class="sd">    stdout</span>
+<span class="sd">    &quot;&quot;&quot;</span>
+    <span class="n">sys</span><span class="o">.</span><span class="n">stdout</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">__stdout__</span>
+    <span class="n">sys</span><span class="o">.</span><span class="n">stderr</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">__stderr__</span>
+    <span class="n">sys</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">get_text</span><span class="p">())</span>
+
 <div class="viewcode-block" id="StdOutWrapper.write"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.StdOutWrapper.write">[docs]</a>  <span class="k">def</span> <span class="nf">write</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">txt</span><span class="p">):</span>
+    <span class="sd">&quot;&quot;&quot;print uses write()</span>
+<span class="sd">    &quot;&quot;&quot;</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">text</span> <span class="o">+=</span> <span class="n">txt</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">text</span> <span class="o">=</span> <span class="s1">&#39;</span><span class="se">\n</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">text</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39;</span><span class="se">\n</span><span class="s1">&#39;</span><span class="p">)[</span><span class="o">-</span><span class="mi">30</span><span class="p">:])</span></div>
+
 <div class="viewcode-block" id="StdOutWrapper.get_text"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.StdOutWrapper.get_text">[docs]</a>  <span class="k">def</span> <span class="nf">get_text</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="k">return</span> <span class="s1">&#39;</span><span class="se">\n</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">text</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39;</span><span class="se">\n</span><span class="s1">&#39;</span><span class="p">))</span></div></div>
  <span class="c1">#def get_text(self,beg,end):</span>
  <span class="c1">#    return &#39;\n&#39;.join(self.text.split(&#39;\n&#39;)[beg:end])</span>

-
-<div class="viewcode-block" id="TUI"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.TUI">[docs]</a><span class="k">class</span> <span class="nc">TUI</span><span class="p">:</span>
+<div class="viewcode-block" id="App"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.App">[docs]</a><span class="k">class</span> <span class="nc">App</span><span class="p">:</span>
  <span class="sd">&quot;&quot;&quot;TUI text-based user interface</span>

 <span class="sd">  initscr is the encapsulation window object of the stdscr</span>
@@ -114,14 +129,9 @@
      <span class="k">try</span><span class="p">:</span>
        <span class="n">delay</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">delay</span><span class="p">)</span>
      <span class="k">except</span> <span class="ne">ValueError</span><span class="p">:</span>
-        <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;TUI(delay)&quot;</span><span class="p">)</span>
+        <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;App(delay)&quot;</span><span class="p">)</span>
        <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Could not convert the argument to an integer.&quot;</span><span class="p">)</span>

-    <span class="c1"># catch all prints into StdOutWrapper</span>
-    <span class="bp">self</span><span class="o">.</span><span class="n">stdout</span> <span class="o">=</span> <span class="n">StdOutWrapper</span><span class="p">()</span>
-    <span class="n">sys</span><span class="o">.</span><span class="n">stdout</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stdout</span>
-    <span class="n">sys</span><span class="o">.</span><span class="n">stderr</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stdout</span>
-
    <span class="c1"># Define the appearance of some interface elements</span>
    <span class="n">hotkey_attr</span> <span class="o">=</span> <span class="n">curses</span><span class="o">.</span><span class="n">A_BOLD</span> <span class="o">|</span> <span class="n">curses</span><span class="o">.</span><span class="n">A_UNDERLINE</span>
    <span class="n">menu_attr</span> <span class="o">=</span> <span class="n">curses</span><span class="o">.</span><span class="n">A_NORMAL</span>
@@ -153,10 +163,28 @@
    <span class="bp">self</span><span class="o">.</span><span class="n">last_pressed_ch</span> <span class="o">=</span> <span class="mi">0</span>                                                        <span class="c1"># getch() Note that the integer returned does not have to be in ASCII range: function keys, keypad keys and so on return numbers higher than 256.</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">last_pressed_mouse_ch</span> <span class="o">=</span> <span class="mi">0</span>

-<div class="viewcode-block" id="TUI.refresh"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.TUI.refresh">[docs]</a>  <span class="k">def</span> <span class="nf">refresh</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+<div class="viewcode-block" id="App.main_loop"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.App.main_loop">[docs]</a>  <span class="k">def</span> <span class="nf">main_loop</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+    <span class="k">with</span> <span class="n">StdOutWrapper</span><span class="p">():</span>
+      <span class="k">try</span><span class="p">:</span>
+        <span class="nb">print</span><span class="p">(</span><span class="s1">&#39;kkkk&#39;</span><span class="p">)</span>
+        <span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
+          <span class="bp">self</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span>
+          <span class="nb">print</span><span class="p">(</span><span class="s1">&#39;kkkk&#39;</span><span class="p">)</span>
+
+          <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">last_pressed_ch</span> <span class="o">==</span> <span class="nb">ord</span><span class="p">(</span><span class="s1">&#39;q&#39;</span><span class="p">):</span>
+            <span class="k">break</span>
+
+          <span class="bp">self</span><span class="o">.</span><span class="n">refresh</span><span class="p">()</span>  <span class="c1"># update the screen</span>
+          <span class="nb">print</span><span class="p">(</span><span class="s1">&#39;kkkk&#39;</span><span class="p">)</span>
+          <span class="bp">self</span><span class="o">.</span><span class="n">getch</span><span class="p">()</span>
+      <span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
+        <span class="nb">print</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
+      <span class="bp">self</span><span class="o">.</span><span class="n">end</span><span class="p">()</span></div>
+
+<div class="viewcode-block" id="App.refresh"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.App.refresh">[docs]</a>  <span class="k">def</span> <span class="nf">refresh</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">initscr</span><span class="o">.</span><span class="n">refresh</span><span class="p">()</span>  <span class="c1"># update the screen</span></div>

-<div class="viewcode-block" id="TUI.getch"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.TUI.getch">[docs]</a>  <span class="k">def</span> <span class="nf">getch</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+<div class="viewcode-block" id="App.getch"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.App.getch">[docs]</a>  <span class="k">def</span> <span class="nf">getch</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="c1"># keep last key value</span>
    <span class="n">last_pressed_ch_current</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">initscr</span><span class="o">.</span><span class="n">getch</span><span class="p">()</span>
    <span class="k">if</span> <span class="n">last_pressed_ch_current</span> <span class="o">!=</span> <span class="n">curses</span><span class="o">.</span><span class="n">ERR</span><span class="p">:</span>
@@ -168,7 +196,7 @@
      <span class="k">else</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">last_pressed_ch</span> <span class="o">=</span> <span class="n">last_pressed_ch_current</span></div>

-<div class="viewcode-block" id="TUI.color_table"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.TUI.color_table">[docs]</a>  <span class="k">def</span> <span class="nf">color_table</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">window</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
+<div class="viewcode-block" id="App.color_table"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.App.color_table">[docs]</a>  <span class="k">def</span> <span class="nf">color_table</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">window</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Print all available colors with default background.</span>
 <span class="sd">    Check if curses.has_colors() is True.</span>
 <span class="sd">    &quot;&quot;&quot;</span>
@@ -198,7 +226,7 @@
      <span class="c1"># End of screen reached</span>
      <span class="k">pass</span></div>

-<div class="viewcode-block" id="TUI.color_def"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.TUI.color_def">[docs]</a>  <span class="k">def</span> <span class="nf">color_def</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+<div class="viewcode-block" id="App.color_def"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.App.color_def">[docs]</a>  <span class="k">def</span> <span class="nf">color_def</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="k">if</span> <span class="n">curses</span><span class="o">.</span><span class="n">can_change_color</span><span class="p">():</span>  <span class="c1"># if True curses.init_color(color_number, r, g, b) can be used</span>
      <span class="k">pass</span></div>
      <span class="c1"># changes colors for the terminal also after closing the program.</span>
@@ -211,21 +239,16 @@
      <span class="c1">#curses.init_color(1, *tmp)</span>
      <span class="c1">#print(curses.color_content(1))</span>

-<div class="viewcode-block" id="TUI.clear"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.TUI.clear">[docs]</a>  <span class="k">def</span> <span class="nf">clear</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+<div class="viewcode-block" id="App.clear"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.App.clear">[docs]</a>  <span class="k">def</span> <span class="nf">clear</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">stdscr</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span></div>

-<div class="viewcode-block" id="TUI.end"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.TUI.end">[docs]</a>  <span class="k">def</span> <span class="nf">end</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+<div class="viewcode-block" id="App.end"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.App.end">[docs]</a>  <span class="k">def</span> <span class="nf">end</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;clean up&quot;&quot;&quot;</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">stdscr</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span>
    <span class="n">curses</span><span class="o">.</span><span class="n">nocbreak</span><span class="p">()</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">stdscr</span><span class="o">.</span><span class="n">keypad</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
    <span class="n">curses</span><span class="o">.</span><span class="n">echo</span><span class="p">()</span>
-    <span class="n">curses</span><span class="o">.</span><span class="n">endwin</span><span class="p">()</span>
-
-    <span class="c1"># go back to normal state and print all catched prints to stdout</span>
-    <span class="n">sys</span><span class="o">.</span><span class="n">stdout</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">__stdout__</span>
-    <span class="n">sys</span><span class="o">.</span><span class="n">stderr</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">__stderr__</span>
-    <span class="n">sys</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">get_text</span><span class="p">())</span></div></div>
+    <span class="n">curses</span><span class="o">.</span><span class="n">endwin</span><span class="p">()</span></div></div>


 <div class="viewcode-block" id="Window"><a class="viewcode-back" href="../../pylib.tui.html#pylib.tui.Window">[docs]</a><span class="k">class</span> <span class="nc">Window</span><span class="p">:</span>
--- a/docs/build/html/genindex.html
+++ b/docs/build/html/genindex.html
@@ -152,12 +152,14 @@
 </li>
      <li><a href="pylib.geometry2d.html#pylib.geometry2d.angle">angle() (in module pylib.geometry2d)</a>
 </li>
-      <li><a href="pylib.data_step.html#pylib.data_step.arc_circle_geometry">arc_circle_geometry() (in module pylib.data_step)</a>
+      <li><a href="pylib.tui.html#pylib.tui.App">App (class in pylib.tui)</a>
 </li>
-      <li><a href="pylib.geometry.html#pylib.geometry.ArcBSplineCurveWithKnots">ArcBSplineCurveWithKnots (class in pylib.geometry)</a>
+      <li><a href="pylib.data_step.html#pylib.data_step.arc_circle_geometry">arc_circle_geometry() (in module pylib.data_step)</a>
 </li>
  </ul></td>
  <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="pylib.geometry.html#pylib.geometry.ArcBSplineCurveWithKnots">ArcBSplineCurveWithKnots (class in pylib.geometry)</a>
+</li>
      <li><a href="pylib.geometry.html#pylib.geometry.ArcCircle">ArcCircle (class in pylib.geometry)</a>
 </li>
      <li><a href="pylib.geometry.html#pylib.geometry.ArcEllipse">ArcEllipse (class in pylib.geometry)</a>
@@ -234,7 +236,7 @@
 </li>
      <li><a href="pylib.geometry.html#pylib.geometry.Properties.circle_sectors">circle_sectors (Properties attribute)</a>
 </li>
-      <li><a href="pylib.tui.html#pylib.tui.TUI.clear">clear() (TUI method)</a>
+      <li><a href="pylib.tui.html#pylib.tui.App.clear">clear() (App method)</a>

      <ul>
        <li><a href="pylib.tui.html#pylib.tui.Window.clear">(Window method)</a>
@@ -242,9 +244,9 @@
      </ul></li>
  </ul></td>
  <td style="width: 33%; vertical-align: top;"><ul>
-      <li><a href="pylib.tui.html#pylib.tui.TUI.color_def">color_def() (TUI method)</a>
+      <li><a href="pylib.tui.html#pylib.tui.App.color_def">color_def() (App method)</a>
 </li>
-      <li><a href="pylib.tui.html#pylib.tui.TUI.color_table">color_table() (TUI method)</a>
+      <li><a href="pylib.tui.html#pylib.tui.App.color_table">color_table() (App method)</a>
 </li>
      <li><a href="pylib.data_step_std.html#pylib.data_step_std.CONIC">CONIC (class in pylib.data_step_std)</a>
 </li>
@@ -346,7 +348,7 @@
 </li>
      <li><a href="pylib.function.html#pylib.function.ellipse">ellipse() (in module pylib.function)</a>
 </li>
-      <li><a href="pylib.tui.html#pylib.tui.TUI.end">end() (TUI method)</a>
+      <li><a href="pylib.tui.html#pylib.tui.App.end">end() (App method)</a>
 </li>
      <li><a href="pylib.function.html#pylib.function.epitrochoid">epitrochoid() (in module pylib.function)</a>
 </li>
@@ -402,7 +404,7 @@
 </li>
      <li><a href="pylib.tui.html#pylib.tui.StdOutWrapper.get_text">get_text() (StdOutWrapper method)</a>
 </li>
-      <li><a href="pylib.tui.html#pylib.tui.TUI.getch">getch() (TUI method)</a>
+      <li><a href="pylib.tui.html#pylib.tui.App.getch">getch() (App method)</a>

      <ul>
        <li><a href="pylib.tui.html#pylib.tui.Window.getch">(Window method)</a>
@@ -494,12 +496,14 @@
 <h2 id="M">M</h2>
 <table style="width: 100%" class="indextable genindextable"><tr>
  <td style="width: 33%; vertical-align: top;"><ul>
-      <li><a href="pylib.mathematics.html#module-mathematics">mathematics (module)</a>
+      <li><a href="pylib.tui.html#pylib.tui.App.main_loop">main_loop() (App method)</a>
 </li>
-      <li><a href="pylib.mathematics.html#pylib.mathematics.matrix">matrix (class in pylib.mathematics)</a>
+      <li><a href="pylib.mathematics.html#module-mathematics">mathematics (module)</a>
 </li>
  </ul></td>
  <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="pylib.mathematics.html#pylib.mathematics.matrix">matrix (class in pylib.mathematics)</a>
+</li>
      <li><a href="pylib.time_of_day.html#pylib.time_of_day.minutes">minutes() (in module pylib.time_of_day)</a>
 </li>
      <li><a href="pylib.time_of_day.html#pylib.time_of_day.minutes_norm">minutes_norm() (in module pylib.time_of_day)</a>
@@ -638,7 +642,7 @@
 </li>
      <li><a href="pylib.geometry2d.html#pylib.geometry2d.rectangle">rectangle() (in module pylib.geometry2d)</a>
 </li>
-      <li><a href="pylib.tui.html#pylib.tui.TUI.refresh">refresh() (TUI method)</a>
+      <li><a href="pylib.tui.html#pylib.tui.App.refresh">refresh() (App method)</a>

      <ul>
        <li><a href="pylib.tui.html#pylib.tui.Window.refresh">(Window method)</a>
@@ -761,8 +765,6 @@
 <table style="width: 100%" class="indextable genindextable"><tr>
  <td style="width: 33%; vertical-align: top;"><ul>
      <li><a href="pylib.mathematics.html#pylib.mathematics.matrix.t">t() (matrix static method)</a>
-</li>
-      <li><a href="pylib.tui.html#pylib.tui.StdOutWrapper.text">text (StdOutWrapper attribute)</a>
 </li>
      <li><a href="pylib.tui.html#pylib.tui.Window.text">text() (Window method)</a>
 </li>
@@ -803,8 +805,6 @@
      <li><a href="pylib.mathematics.html#pylib.mathematics.matrix.transposed">transposed() (matrix static method)</a>
 </li>
      <li><a href="pylib.numerical.integration.html#pylib.numerical.integration.trapez">trapez() (in module pylib.numerical.integration)</a>
-</li>
-      <li><a href="pylib.tui.html#pylib.tui.TUI">TUI (class in pylib.tui)</a>
 </li>
      <li><a href="pylib.tui.html#module-tui">tui (module)</a>
 </li>
--- a/docs/build/html/objects.inv
+++ b/docs/build/html/objects.inv
--- a/docs/build/html/pylib.tui.html
+++ b/docs/build/html/pylib.tui.html
@@ -38,96 +38,91 @@
 <p>TUI module.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Date</dt>
-<dd class="field-odd"><p>2020-01-10</p>
+<dd class="field-odd"><p>2020-01-13</p>
 </dd>
 </dl>
 <span class="target" id="module-tui"></span><dl class="class">
-<dt id="pylib.tui.StdOutWrapper">
-<em class="property">class </em><code class="sig-name descname">StdOutWrapper</code><a class="reference internal" href="_modules/pylib/tui.html#StdOutWrapper"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.StdOutWrapper" title="Permalink to this definition">¶</a></dt>
-<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p>
-<p>Send print to stdout (print to the standard console).</p>
-<p>usage:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># catch all prints into StdOutWrapper</span>
-<span class="n">mystdout</span> <span class="o">=</span> <span class="n">StdOutWrapper</span><span class="p">()</span>
-<span class="n">sys</span><span class="o">.</span><span class="n">stdout</span> <span class="o">=</span> <span class="n">mystdout</span>
-<span class="n">sys</span><span class="o">.</span><span class="n">stderr</span> <span class="o">=</span> <span class="n">mystdout</span>
-
-<span class="c1"># begin curses (curses.initscr())</span>
-
-<span class="c1"># do your stuff here</span>
-<span class="c1"># print(&quot;foo&quot;)</span>
-<span class="c1"># you can also output mystdout.get_text() in a ncurses widget in</span>
-<span class="c1"># runtime</span>
-
-<span class="c1"># end curses (curses.endwin())</span>
-
-<span class="c1"># go back to normal state and print all catched prints to stdout</span>
-<span class="n">sys</span><span class="o">.</span><span class="n">stdout</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">__stdout__</span>
-<span class="n">sys</span><span class="o">.</span><span class="n">stderr</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">__stderr__</span>
-<span class="n">sys</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">mystdout</span><span class="o">.</span><span class="n">get_text</span><span class="p">())</span>
-</pre></div>
-</div>
-<dl class="simple">
-<dt>source:</dt><dd><p><a class="reference external" href="https://stackoverflow.com/a/14010948">https://stackoverflow.com/a/14010948</a></p>
-</dd>
-</dl>
-<dl class="method">
-<dt id="pylib.tui.StdOutWrapper.get_text">
-<code class="sig-name descname">get_text</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#StdOutWrapper.get_text"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.StdOutWrapper.get_text" title="Permalink to this definition">¶</a></dt>
-<dd></dd></dl>
-
-<dl class="attribute">
-<dt id="pylib.tui.StdOutWrapper.text">
-<code class="sig-name descname">text</code><em class="property"> = ''</em><a class="headerlink" href="#pylib.tui.StdOutWrapper.text" title="Permalink to this definition">¶</a></dt>
-<dd></dd></dl>
-
-<dl class="method">
-<dt id="pylib.tui.StdOutWrapper.write">
-<code class="sig-name descname">write</code><span class="sig-paren">(</span><em class="sig-param">txt</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#StdOutWrapper.write"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.StdOutWrapper.write" title="Permalink to this definition">¶</a></dt>
-<dd></dd></dl>
-
-</dd></dl>
-
-<dl class="class">
-<dt id="pylib.tui.TUI">
-<em class="property">class </em><code class="sig-name descname">TUI</code><span class="sig-paren">(</span><em class="sig-param">delay=5</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#TUI"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.TUI" title="Permalink to this definition">¶</a></dt>
+<dt id="pylib.tui.App">
+<em class="property">class </em><code class="sig-name descname">App</code><span class="sig-paren">(</span><em class="sig-param">delay=5</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#App"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.App" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p>
 <p>TUI text-based user interface</p>
 <p>initscr is the encapsulation window object of the stdscr
 stdsc is the curses.initscr</p>
 <dl class="method">
-<dt id="pylib.tui.TUI.clear">
-<code class="sig-name descname">clear</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#TUI.clear"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.TUI.clear" title="Permalink to this definition">¶</a></dt>
+<dt id="pylib.tui.App.clear">
+<code class="sig-name descname">clear</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#App.clear"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.App.clear" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="method">
-<dt id="pylib.tui.TUI.color_def">
-<code class="sig-name descname">color_def</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#TUI.color_def"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.TUI.color_def" title="Permalink to this definition">¶</a></dt>
+<dt id="pylib.tui.App.color_def">
+<code class="sig-name descname">color_def</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#App.color_def"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.App.color_def" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="method">
-<dt id="pylib.tui.TUI.color_table">
-<code class="sig-name descname">color_table</code><span class="sig-paren">(</span><em class="sig-param">window=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#TUI.color_table"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.TUI.color_table" title="Permalink to this definition">¶</a></dt>
+<dt id="pylib.tui.App.color_table">
+<code class="sig-name descname">color_table</code><span class="sig-paren">(</span><em class="sig-param">window=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#App.color_table"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.App.color_table" title="Permalink to this definition">¶</a></dt>
 <dd><p>Print all available colors with default background.
 Check if curses.has_colors() is True.</p>
 </dd></dl>

 <dl class="method">
-<dt id="pylib.tui.TUI.end">
-<code class="sig-name descname">end</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#TUI.end"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.TUI.end" title="Permalink to this definition">¶</a></dt>
+<dt id="pylib.tui.App.end">
+<code class="sig-name descname">end</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#App.end"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.App.end" title="Permalink to this definition">¶</a></dt>
 <dd><p>clean up</p>
 </dd></dl>

 <dl class="method">
-<dt id="pylib.tui.TUI.getch">
-<code class="sig-name descname">getch</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#TUI.getch"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.TUI.getch" title="Permalink to this definition">¶</a></dt>
+<dt id="pylib.tui.App.getch">
+<code class="sig-name descname">getch</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#App.getch"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.App.getch" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="method">
-<dt id="pylib.tui.TUI.refresh">
-<code class="sig-name descname">refresh</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#TUI.refresh"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.TUI.refresh" title="Permalink to this definition">¶</a></dt>
+<dt id="pylib.tui.App.main_loop">
+<code class="sig-name descname">main_loop</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#App.main_loop"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.App.main_loop" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

+<dl class="method">
+<dt id="pylib.tui.App.refresh">
+<code class="sig-name descname">refresh</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#App.refresh"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.App.refresh" title="Permalink to this definition">¶</a></dt>
+<dd></dd></dl>
+
+</dd></dl>
+
+<dl class="class">
+<dt id="pylib.tui.StdOutWrapper">
+<em class="property">class </em><code class="sig-name descname">StdOutWrapper</code><a class="reference internal" href="_modules/pylib/tui.html#StdOutWrapper"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.StdOutWrapper" title="Permalink to this definition">¶</a></dt>
+<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p>
+<p>Send print to stdout (print to the standard console).</p>
+<dl class="field-list simple">
+<dt class="field-odd">Example</dt>
+<dd class="field-odd"><p></p></dd>
+</dl>
+<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># catch all prints into StdOutWrapper</span>
+<span class="k">with</span> <span class="n">StdOutWrapper</span><span class="p">()</span> <span class="k">as</span> <span class="n">mystdout</span><span class="p">:</span>
+
+  <span class="c1"># begin curses (curses.initscr(), ...)</span>
+
+  <span class="c1"># do your stuff here</span>
+  <span class="c1"># print(&quot;foo&quot;)</span>
+  <span class="c1"># you can also output mystdout.get_text() in a ncurses widget in</span>
+  <span class="c1"># runtime</span>
+
+  <span class="c1"># end curses (curses.endwin())</span>
+
+<span class="c1"># go back to normal state and print all catched prints to stdout</span>
+</pre></div>
+</div>
+<dl class="method">
+<dt id="pylib.tui.StdOutWrapper.get_text">
+<code class="sig-name descname">get_text</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#StdOutWrapper.get_text"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.StdOutWrapper.get_text" title="Permalink to this definition">¶</a></dt>
+<dd></dd></dl>
+
+<dl class="method">
+<dt id="pylib.tui.StdOutWrapper.write">
+<code class="sig-name descname">write</code><span class="sig-paren">(</span><em class="sig-param">txt</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/pylib/tui.html#StdOutWrapper.write"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pylib.tui.StdOutWrapper.write" title="Permalink to this definition">¶</a></dt>
+<dd><p>print uses write()</p>
+</dd></dl>
+
 </dd></dl>

 <dl class="class">
--- a/docs/build/html/searchindex.js
+++ b/docs/build/html/searchindex.js
--- a/examples/tui.py
+++ b/examples/tui.py
@@ -15,7 +15,7 @@ import curses
 import locale
 from pylib.data import seq
 from pylib.function import sine_wave, cosine_wave, hypotrochoid, to_str
-from pylib.tui import TUI
+from pylib.tui import App

 locale.setlocale(locale.LC_ALL, '')
 CODE = locale.getpreferredencoding()
@@ -115,7 +115,7 @@ def main(delay=1):
  """
  no window change for mouse events and resize events.
  """
-  tui = TUI(delay)
+  tui = App(delay)
  initscr = tui.initscr
  try:
    tui.last_pressed_ch = 0                                                        # getch() Note that the integer returned does not have to be in ASCII range: function keys, keypad keys and so on return numbers higher than 256.
--- a/pylib/tui.py
+++ b/pylib/tui.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 """TUI module.

-:Date: 2020-01-10
+:Date: 2020-01-13

 .. module:: tui
  :platform: *nix, Windows
@@ -27,43 +27,58 @@ def newwin(height, width, y, x):
 class StdOutWrapper:
  """Send print to stdout (print to the standard console).

-  usage:
+  :Example:

  ::

    # catch all prints into StdOutWrapper
-    mystdout = StdOutWrapper()
-    sys.stdout = mystdout
-    sys.stderr = mystdout
+    with StdOutWrapper() as mystdout:

-    # begin curses (curses.initscr())
+      # begin curses (curses.initscr(), ...)

-    # do your stuff here
-    # print("foo")
-    # you can also output mystdout.get_text() in a ncurses widget in
-    # runtime
+      # do your stuff here
+      # print("foo")
+      # you can also output mystdout.get_text() in a ncurses widget in
+      # runtime

-    # end curses (curses.endwin())
+      # end curses (curses.endwin())

    # go back to normal state and print all catched prints to stdout
+
+
+  """
+  # https://stackoverflow.com/a/14010948
+  def __init__(self):
+    self.text = ""
+
+  def __enter__(self):
+    """catch all prints into StdOutWrapper
+    """
+    #self.stdout = StdOutWrapper()
+    sys.stdout = self
+    sys.stderr = self
+    return self  # to use as: with StdOutWrapper() as mystdout:
+
+  def __exit__(self, etype, value, traceback):
+    """go back to normal state and print all catched prints to
+    stdout
+    """
    sys.stdout = sys.__stdout__
    sys.stderr = sys.__stderr__
-    sys.stdout.write(mystdout.get_text())
+    sys.stdout.write(self.get_text())

-  source:
-    https://stackoverflow.com/a/14010948
-  """
-  text = ""
  def write(self, txt):
+    """print uses write()
+    """
    self.text += txt
    self.text = '\n'.join(self.text.split('\n')[-30:])
+
  def get_text(self):
    return '\n'.join(self.text.split('\n'))
  #def get_text(self,beg,end):
  #    return '\n'.join(self.text.split('\n')[beg:end])

-
-class TUI:
+class App:
  """TUI text-based user interface

  initscr is the encapsulation window object of the stdscr
@@ -79,14 +94,9 @@ class TUI:
      try:
        delay = int(delay)
      except ValueError:
-        print("TUI(delay)")
+        print("App(delay)")
        print("Could not convert the argument to an integer.")

-    # catch all prints into StdOutWrapper
-    self.stdout = StdOutWrapper()
-    sys.stdout = self.stdout
-    sys.stderr = self.stdout
-
    # Define the appearance of some interface elements
    hotkey_attr = curses.A_BOLD | curses.A_UNDERLINE
    menu_attr = curses.A_NORMAL
@@ -118,6 +128,24 @@ class TUI:
    self.last_pressed_ch = 0                                                        # getch() Note that the integer returned does not have to be in ASCII range: function keys, keypad keys and so on return numbers higher than 256.
    self.last_pressed_mouse_ch = 0

+  def main_loop(self):
+    with StdOutWrapper():
+      try:
+        print('kkkk')
+        while True:
+          self.clear()
+          print('kkkk')
+
+          if self.last_pressed_ch == ord('q'):
+            break
+
+          self.refresh()  # update the screen
+          print('kkkk')
+          self.getch()
+      except Exception as e:
+        print(e)
+      self.end()
+
  def refresh(self):
    self.initscr.refresh()  # update the screen

@@ -187,11 +215,6 @@ class TUI:
    curses.echo()
    curses.endwin()

-    # go back to normal state and print all catched prints to stdout
-    sys.stdout = sys.__stdout__
-    sys.stderr = sys.__stderr__
-    sys.stdout.write(self.stdout.get_text())
-

 class Window:
  """Window