Term
| 1.What is a Graphical User Interface (GUI)? |
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Definition
| how most people interact w computer each day. Windows, icons, buttons, dialog boxes etc. Interaction via keyboard + mouse |
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Term
| 2.What is a Command Line Interface (CLI)? |
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Definition
| text based interface. Code prompts user for input. Allows them to type commands |
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Term
| 3.Outline the concept of event-driven programming. |
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Definition
| the user can interact with any active part of the GUI at any time. User triggers an event by interacting with the GUI, code runs in response to these events |
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Term
| 4.Define the terms "main loop", "event" and "event handler". |
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Definition
main loop: constantly listens for events such as mouse click, typing, mouse hovering etc
event - see above
event handler: once the event happens it triggers a function which has been set to handle the event. Event handler is attached to the event
Endless loop
wait for event
if event is 'quit'
break
else
handle event |
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Term
| 5.Name and briefly describe 5 widgets available in the "tkinter" module (i.e. Tk). |
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Definition
label - display text
button - bsic window operation
frame - layout of widgets in a window
entry - text input field
check button/ radio button - form elements |
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Term
| 6.Write code that creates a "Label" widget with the text "Hello" and packs it to the bottom side of a window named "main". |
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Definition
label (self.main, text = 'Hello')
label.pack (side = 'bottom') |
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Term
| 7.What are "Frame" widgets used for? |
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Definition
| widget or container that holds other widgets. Used to implement more sophisticated layouts |
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Term
| 8.How do you specify a function or method to call when a "Button" widget is clicked? |
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Definition
| you attach a command so that the method happens when the button is clicked. Method could be to show a message for example |
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Term
| 9.Describe some of the message boxes types that can be shown using the "tkinter.messagebox" module. |
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Definition
- showinfo(), - showwarning(), - showerror() or decision boxes:
- askyesno(), -askokcancel(), - askretrycancel() |
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Term
| 10.What do "tkinter.INSERT" and "tkinter.END" reference in an "Entry" widget? |
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Definition
| specify a start and end point in the field |
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Term
| 11.How do you get and set the value of a "StringVar" object? |
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Definition
used to show what an entry or label contains.
set() will allow you to change the entry or label by changing the StringVar
get() gives you the current value of the StringVar
Basically reuse labels/entry boxes etc |
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Term
| 12.Why is it useful to create a mockup of a GUI before trying to implement it? |
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Definition
| same reason you would do pseudocode/flow chart. Planning design, save time when actually programming |
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Term
| 13.What is a GUI builder? |
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Definition
| lets you build gui in a visual way. basically drag and drop widgets. Tweak the settings and the code is produced |
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Term
| 14.Why is XML being used to define program GUIs? |
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Definition
| simplify GUI creation and increase maintainability. Separate the GUI from the code |
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