Widgets

Group for visible widgets on screen. More...

Modules
	GUI_TEMPLATE
	Button
	Button which can be pressed.
	Checkbox
	Checkbox widget.
	Container
	Container widget holding widgets.
	Debug box
	Debug box widget.
	Dialog base element
	Base element for dialog, usually parent of dialog window.
	Dropdown
	Dropdown widget.
	Edit text
	Single-line edit text widget.
	Graph
	Graph which can display plots.
	Image
	Image display widget.
	Led
	Simple LED.
	List view container
	List view container is basic widget for scrolling.
	Listbox
	LISTBOX widget.
	List view
	List view object.
	Progress bar
	Progress bar for progress visualization.
	Radio box
	Radio box widget.
	Slider
	Simple slider widget for user interaction.
	Text view
	Text view widget.
	Core widget functions
	Core functions for all widgets.
	List view helpers
	Helper functions for widgets implementing view for lists.
	Window
	Basic widget and core parent to all other widgets.

Detailed Description

Group for visible widgets on screen.

Widget organization

Widgets are organized in multi depth linked list of parent widgets where each widget has reference to:

• Next widget
• Previous widget
• Parent widget
• Children first widget
• Children last widget

Next widget link

Next widget in linked list is used to get next widget for drawing operation. Widget which is at the end of linked list is later visible on top on LCD.

Previous widget link

Previous link is used to get widget which is "behind" current widget. This link is used for touch management where widget at the end of linked list is first checked for events (touch, mouse, etc) because it is visible on top

Parent widget

Link to parent widget is always required to calculate currect widget position on LCD and for other tasks (like percentage width, etc)

Children first widget

Children links are supported on widgets which implement GUI_HANDLE_ROOT_t structure to handle children widgets (such as windows). It holds link to first children widget on the list.

Children last widget

Children last widget is used for events processing (touch, mouse, etc)

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Any operation on widget structure (change Z-index, put on front, etc) is only moving widgets on linked list. With this, you can change visible order and also order how events are processed (touch, keyboard). Linked list is most important part of GUI library therefore it is designed in robust way.