Text-based User Interface
The TUI is developed using urwid.
The following are the key components that make up the UI.
At the top of the UI.
Fixed height of 4 lines.
Contains the project title with a surrounding color fill and a line-box decoration.
Hidden in full image views.
Immediately below the title banner.
Consists of two sub-components (described below) arranged horizontally: * Menu * View
Sub-component of the viewer to the left.
Fixed width of 20 columns.
Contains a list of image and directory entries which can be scrolled through.
Used to scroll through images in a directory and navigate back and forth through directories, among other actions.
Sub-component of the viewer to the right.
Images are displayed in here.
The content can be one of these two, depending on the type of item currently selected in the menu: * An image: When the item selected in the menu is an image. * An image grid: When the item selected in the menu is a directory.
The view component can also be used to scroll through images.
Immediately above the Action/Key Bar.
Fixed height of 2 lines.
Notifications about various events are displayed here.
Hidden in full image views.
These are used for various purposes such as help menu, confirmations, etc.
They are shown only when certain actions are triggered.
Used for debugging.
This is a 1-line bar immediately above the action/key bar.
Only shows (in all views) when the
--debugoption is specified.
Full/Maximized image views consist of only the view and action/key bar components.
A context is simply a set of actions.
The active context might change due to one of these:
Triggering certain actions.
Change of viewer sub-component (i.e menu or view) in focus.
Type of menu entry selected.
An overlay is shown.
The active context determines which actions are available and displayed in the action/key bar at the bottom of the UI.
The following are the contexts available:
global: The actions in this context are available when any other context is active, with a few exceptions.
menu: This context is active when the menu UI component is in focus and non-empty.
image: This context is active if the view UI component is in focus and was switched to (from the menu) while an image entry was selected.
image-grid: This context is active if the view UI component is in focus and was switched to (from the menu) while a directory entry was selected.
full-image: This context is active when an image entry is maximized from the
imagecontext (using the
Maximizeaction) or from the
menucontext using the
full-grid-image: This context is active when an image grid cell is maximized from the
image-gridcontext (using the
confirmation: This context is active only when specific actions that require confirmation are triggered e.g the
Deleteaction in some contexts.
overlay: This context is active only when an overlay UI component (e.g the help menu) is shown.
name: The name of the action.
key: The key/combination used to trigger the action.
symbol: A string used to represent the key.
description: A brief description of what the action does.
visibility: Determines if the action is displayed in the action/key bar or not.
state: Determines if the action is enabled or not. * If an action is disabled, pressing its key will trigger the terminal bell.
All contexts and their actions (with default properties) are defined in
_context_keys in the