Login Form Example
Demonstrates how to create a modal overlay for user input.
Many applications need to block interaction with the main UI while collecting specific information, like a login prompt or confirmation dialog. Managing the z-index and input focus for these overlays can be tricky.
This example solves this by using the Overlay widget to stack a centered popup on top of a base layer, conditionally rendering the popup based on state.
Features Demonstrated
-
Overlays: Stacking widgets on top of each other using
tui.overlay. -
Centering: Positioning a widget in the center of the screen using
tui.center. -
State Management: Switching between “Base” and “Popup” views.
-
Input Handling: Capturing text input and handling specific keys (Enter, Esc) to trigger state changes.
-
Cursor Positioning: Manually calculating cursor position within a
Paragraph.
Hotkeys
Form Mode
-
Text Input: Type to enter username (supports all characters including ‘q’).
-
Backspace: Deletes the last character.
-
Enter: Submits the form and opens the success popup.
-
Esc: Quits the application.
-
Ctrl+C: Quits the application.
Popup Mode
-
q: Closes the popup and quits the application.
-
Ctrl+C: Quits the application.
Usage
ruby examples/app_login_form/app.rb
Learning Outcomes
Use this example if you need to… - Create a modal dialog or popup. - Center a widget on the screen (vertically and horizontally). - Implement a simple text input field with cursor management. - layer widgets using the Overlay widget.