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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 17:35:20 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 17:35:20 +0000 |
commit | e106bf94eff07d9a59771d9ccc4406421e18ab64 (patch) | |
tree | edb6545500e39df9c67aa918a6125bffc8ec1aee /examples/full-screen/calculator.py | |
parent | Initial commit. (diff) | |
download | prompt-toolkit-upstream.tar.xz prompt-toolkit-upstream.zip |
Adding upstream version 3.0.36.upstream/3.0.36upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'examples/full-screen/calculator.py')
-rwxr-xr-x | examples/full-screen/calculator.py | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/examples/full-screen/calculator.py b/examples/full-screen/calculator.py new file mode 100755 index 0000000..fda6567 --- /dev/null +++ b/examples/full-screen/calculator.py @@ -0,0 +1,98 @@ +#!/usr/bin/env python +""" +A simple example of a calculator program. +This could be used as inspiration for a REPL. +""" +from prompt_toolkit.application import Application +from prompt_toolkit.document import Document +from prompt_toolkit.filters import has_focus +from prompt_toolkit.key_binding import KeyBindings +from prompt_toolkit.layout.containers import HSplit, Window +from prompt_toolkit.layout.layout import Layout +from prompt_toolkit.styles import Style +from prompt_toolkit.widgets import SearchToolbar, TextArea + +help_text = """ +Type any expression (e.g. "4 + 4") followed by enter to execute. +Press Control-C to exit. +""" + + +def main(): + # The layout. + search_field = SearchToolbar() # For reverse search. + + output_field = TextArea(style="class:output-field", text=help_text) + input_field = TextArea( + height=1, + prompt=">>> ", + style="class:input-field", + multiline=False, + wrap_lines=False, + search_field=search_field, + ) + + container = HSplit( + [ + output_field, + Window(height=1, char="-", style="class:line"), + input_field, + search_field, + ] + ) + + # Attach accept handler to the input field. We do this by assigning the + # handler to the `TextArea` that we created earlier. it is also possible to + # pass it to the constructor of `TextArea`. + # NOTE: It's better to assign an `accept_handler`, rather then adding a + # custom ENTER key binding. This will automatically reset the input + # field and add the strings to the history. + def accept(buff): + # Evaluate "calculator" expression. + try: + output = "\n\nIn: {}\nOut: {}".format( + input_field.text, eval(input_field.text) + ) # Don't do 'eval' in real code! + except BaseException as e: + output = f"\n\n{e}" + new_text = output_field.text + output + + # Add text to output buffer. + output_field.buffer.document = Document( + text=new_text, cursor_position=len(new_text) + ) + + input_field.accept_handler = accept + + # The key bindings. + kb = KeyBindings() + + @kb.add("c-c") + @kb.add("c-q") + def _(event): + "Pressing Ctrl-Q or Ctrl-C will exit the user interface." + event.app.exit() + + # Style. + style = Style( + [ + ("output-field", "bg:#000044 #ffffff"), + ("input-field", "bg:#000000 #ffffff"), + ("line", "#004400"), + ] + ) + + # Run application. + application = Application( + layout=Layout(container, focused_element=input_field), + key_bindings=kb, + style=style, + mouse_support=True, + full_screen=True, + ) + + application.run() + + +if __name__ == "__main__": + main() |