Difference between revisions of "Fresnel"
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** Testsuite | ** Testsuite | ||
** colors: rgb, rgba, hsl, hsla | ** colors: rgb, rgba, hsl, hsla | ||
− | ** borders: | + | ** borders: style |
+ | ** invalidate changed containers, paint only parts | ||
+ | * Renderer-Skia: | ||
+ | ** [https://skia.org/ Skia] | ||
+ | ** Testsuite | ||
+ | ** colors: rgb, rgba, hsl, hsla | ||
+ | ** borders: style | ||
** invalidate changed containers, paint only parts | ** invalidate changed containers, paint only parts | ||
* Events | * Events | ||
** Done: AddEventListener, RemoveEventListener, CallEventListeners | ** Done: AddEventListener, RemoveEventListener, CallEventListeners | ||
− | ** mouse | + | ** Done: Mouse Down/Move/Up and Click |
+ | ** mouse leave/enter | ||
** keyboard | ** keyboard | ||
** pseudo attribute :hover | ** pseudo attribute :hover | ||
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* Fresnel backend | * Fresnel backend | ||
− | ** | + | ** cocoa |
− | + | ** gtk3: creating windows and some events: mouse+draw | |
− | ** mouse | + | ** lcl: creating windows and some events: mouse+draw |
− | ** | + | ** winapi |
− | ** | ||
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* Animation | * Animation | ||
* Fresnel components: | * Fresnel components: |
Revision as of 09:21, 23 September 2023
Overview
Fresnel is a visual component library based on CSS and custom drawn components. It is in an early stage of development.
git repo: https://gitlab.com/freepascal.org/lazarus/fresnel
Requirements: fpc 3.3.1
What is working?
As Fresnel is still in an early pre-alpha stage, a few things do work already:
- fcl-css supports most basic CSS features, even some CSS-5 feats
- A Lazarus package src/fresnel.lpk containing the runtime units for standalone applications.
- A Lazarus package src/lcl/fresnellcl.lpk containing the runtime units for Fresnel inside a LCL applications.
- A Lazarus designtime package design/fresneldsgn.lpk registering a Fresnel Form, allowing to put TBody, TDiv, TSpan, etc onto the designer.
- TFresnelElement
- a TComponent that works similar to an HTML element
- supports many common CSS attributes like border, padding, margin, etc
- has inline CSS in the Style property and CSS classes in the CSSClasses property
- Elements can have child elements, building a tree similar to the browser DOM.
- CSS attributes are evaluated to their computed values.
- You can define descendants adding their own CSS attributes. See for example TDiv, TSpan and TCustomLabel
- TFresnelViewport
- a TFresnelElement that is the root of the tree.
- Defines the Width and Height of the rendering area and a FontEngine.
- Contains a CSS StyleSheet property, which is applied to all its child elements, but the CSS has no effect on the viewport itself.
- Contains a Layouter, which computes all the element render boxes and has a pluggable system to support various node layouters - needed for flao, flex and grid layuout. Currently only a rudimentary flow nodelayouter is implemented.
- TDiv - a TFresnelElement similar to HTML div element, i.e. block
- TSpan - a TFresnelElement similar to HTML span element, i.e. inline
- TReplacedElement - a TFresnelElement leaf node
- TCustomLabel - a TReplacedElement with a Caption property, the text specifies the min-width and min-height and is rendered.
- TLabel - a TCustomLabel with published properties
- TBody - a TElement, similar to HTML body element
- Unit Fresnel.LCLControls providing controls for using the Fresnel framework in a LCL application.
Roadmap
- Done: Rename TFresneLabel to TLabel, this requires Lazarus to support duplicate component classnames
- Done: Extend TReader to search component classes using Field names
- Done: Extend RTL format to optionally write unitnames: TWriter, ObjectBinaryToText, GetClass(anUnitName,aClassName)
- Done: Extend RTL format to automatically detect the new format with unitnames: TReader, ObjectTextToBinary
- Done: codetools lfm parser
- Done: Lazarus TReader.OnFindComponentClassEx to load lfms without unitnames even if fresnel TButton is registered
- Done: Extend component palette and component list
- Done: Component icons with unitnames
- Done: when dropping a component on designer: prepend unitname to classtype if needed
- Done: load lfm in designer: commpute/parse to handle ambiguous classes
- ToDo: Lazarus lfm repair wizard
- ToDo: all Lazarus GetClass places to query with unitname
- ToDo: extend tool Change Class
- Layouter:
- Testsuite
- Flow layouter:
- fragments for elements, needed for wordwrap and toolbars,
- floats (left, right),
- direction,
- position relative+sticky,
- line-height
- Flex layouter
- Grid layouter
- Overflow: scrolling, clipping
- Fresnel lcl form
- Done: property editor: viewport stylesheet, inline style
- CSS errors
- CSS completion box
- view for exploring computed CSS attributes and errors
- Renderer-LCL:
- Testsuite
- colors: rgb, rgba, hsl, hsla
- borders: style
- invalidate changed containers, paint only parts
- Renderer-Skia:
- Skia
- Testsuite
- colors: rgb, rgba, hsl, hsla
- borders: style
- invalidate changed containers, paint only parts
- Events
- Done: AddEventListener, RemoveEventListener, CallEventListeners
- Done: Mouse Down/Move/Up and Click
- mouse leave/enter
- keyboard
- pseudo attribute :hover
- Fresnel backend
- cocoa
- gtk3: creating windows and some events: mouse+draw
- lcl: creating windows and some events: mouse+draw
- winapi
- Animation
- Fresnel components:
- Testsuite
- div, span, label
- label multi line
- link (CSS a), pseudo elements: :active, :link, :visited
- image (CSS img)
- edit aka input type=text
- textarea
- Testsuite
- Other:
- CSS attribute "all"
- CSS function "calc"
- CSS variables
- CSS selector @media
- background gradient
- background image
- stylesheets for windows, linux, macos
- lists
- special funding page on foundation site.
- optimizations for big tables
- storing css attributes for sets of rules
- HTML importer