Brick changelog

0.12

This release primarily adds support for mouse interaction. For details, see the Mouse Support section of the User Guide. This release also includes breaking API changes for the App type. Here's a migration guide:

• Event handlers now take "BrickEvent n e" instead of "e", where "e" was the custom event type used before this change. To recover your own custom events, pattern-match on "AppEvent"; to recover Vty input events, pattern-match on "VtyEvent".
• appLiftVtyEvent went away and can just be removed from your App record constructor.
• If you aren't using the custom event type or were just using Vty's "Event" type as your App's event type, you can set your event type to just "e" because you'll now be able to get Vty events regardless of whether you use a custom event type.

API changes:

• Added the Widget combinator "clickable" to indicate that a widget should generate mouse click events
• Added the Extent data type and the "reportExtent" widget combinator to report the positions and sizes of widgets
• Rendering "Result" values now include reported extents and update their offsets (adds "extents" field and "extentsL" lens)
• Added "lookupExtent", "findClickedExtents", and "clickedExtent" in EventM to find extents and check them for mouse clicks
• Removed appLiftVtyEvent. Instead of wrapping Vty's events in your own type, you now get a "BrickEvent" that always contains Vty events but has the ability to embed your custom events. See the User Guide for details.
• Added demo program MouseDemo.hs
• Added demo program ProgressBarDemo.hs (thanks Kevin Quick)
• Added mapAttrname, mapAttrNames, and overrideAttr functions (thanks Kevin Quick)
• Make handleEventLensed polymorphic over event type to allow use with custom events (thanks Kevin Quick)
• Added Ord constraint to some library startup functions

Bug fixes:

• Added Show instance for Editor, List (fixes #63)

Documentation changes:

• Updated documentation to use new "resource name" terminology to reduce confusion and better explain the purpose of names.
• Updated user guide with sections on mouse support, the rendering cache, resource names, paste mode, and extents

Package changes:

• Depend on Vty 5.11.3 to get mouse mode support

0.11

API changes:

• Added getVtyHandle in EventM for obtaining the current Vty context. It returns Nothing when calling the appStartEvent handler but after that a context is always available.

0.10

New features:

• Added a rendering cache. To use the rendering cache, use the 'cached' widget combinator. This causes drawings of the specified widget to re-use a cached rendering until the rendering cache is invalidated with 'invalidateCacheEntry' or 'invalidateCache'. This change also includes programs/CacheDemo.hs. This change introduced an Ord constraint on the name type variable 'n'.
• Added setTop and setLeft for setting viewport offsets directly in EventM.
• Dialog event handlers now support left and right arrow keys (thanks Grégoire Charvet)

Library changes:

• On resizes brick now draws the application twice before handling the resize event. This change makes it possible for event handlers to get the latest viewport states on a resize rather than getting the most recent (but stale) versions as before, at the cost of a second redraw.

Bug fixes:

• We now use the most recent rendering state when setting up event handler viewport data. This mostly won't matter to anyone except in cases where a viewport name was expected to be in the viewport map but wasn't due to using stale rendering state to set up EventM.

0.9

Package changes:

• Depend on text-zipper 0.7.1

API changes:

• The editor widget state value is now polymorphic over the type of "string" value that can be edited, so you can now create editors over Text values as well as Strings. This is a breaking change but it only requires the addition of the string type variable to any uses of Editor. (thanks Jason Dagit and Getty Ritter)
• Added some missing Eq and Show instances (thanks Grégoire Charvet)

New features:

• The editor now binds Control-U to delete to beginning of line (thanks Hans-Peter Deifel)

Bug fixes:

• List: avoid runtime exception by ensuring item height is always at least 1

0.8

API changes:

• Center: added layer-friendly centering functions centerLayer, hCenterLayer, and vCenterLayer.

Functionality changes:

• Dialog now uses new layer-friendly centering functions. This makes it possible to overlay a Dialog on top of your UI when you use a Dialog rendering as a separate layer.
• Updated the LayerDemo to demonstrate a centered layer.
• The renderer now uses a default Vty Picture background of spaces with the default attribute, rather than using ClearBackground (the Vty default). This is to compensate for an unexpected attribute behavior in Vty when ClearBackgrounds (see https://github.com/coreyoconnor/vty/issues/95)

0.7

NOTE: this release includes many API changes. Please see the "Widget Names" section of the Brick User Guide for details on the fundamentals!

API changes:

• The "Name" type was removed. In its place we now have a name type variable ("n") attached to many types (including EventM, CursorLocation, App, Editor, List, and FocusRing). This change makes it possible to:
  • Avoid runtime errors due to name typos
  • Achieve compile-time guarantees about name matching and usage
  • Force widget functions to be name-agnostic by being polymorphic in their name type
  • Clean up focus handling by making it possible to pattern-match on cursor location names
• The EditDemo demonstration program was updated to use a FocusRing.
• Added the "Named" type class to Brick.Widgets.Core for types that store names. This type class is used to streamline the Focus interface; see Brick.Focus.withFocusRing and EditDemo.hs.
• The List and Editor types are now parameterized on names.
• The List widget is now focus-aware; its rendering function now takes a boolean indicating whether it should be rendered with focus. The List uses the following attributes now:
  • When not focused, the cursor is rendered with listSelectedAttr.
  • When focused, the cursor is rendered with listSelectedFocusedAttr.
• The Editor widget is now focus-aware; its rendering function now takes a boolean indicating whether it should be rendered with focus. The Editor uses the following attributes now:
  • When not focused, the widget is rendered with editAttr.
  • When focused, the widget is rendered with editFocusedAttr.
• The Dialog's name constructor parameter and lens were removed.
• The 'viewport' function was modified to raise a runtime exception if the widget name it receives is used more than once during the rendering of a single frame.

Miscellaneous:

• Many modules now use conditional imports to silence redundancy warnings on GHCs with newer Preludes (e.g. including Monoid, Foldable, Traversable, Applicative, etc.)

0.6.4

Bug fixes:

• Add missing Functor instance for Next type (thanks Markus Hauck)

0.6.3

Bug fixes:

• List: the list now properly renders when the available height is not a multiple of the item height. Previously the list size would decrease relative to the available height. Now the list renders enough items to fill the space even if the top-most or bottom-most item is partially visible, which is the expected behavior.

0.6.2

Bug fixes:

• Editor: the 'editor' initial content parameter is now correctly split on newlines to ensure that the underlying editor zipper is initialized properly. (fixes #56; thanks @listx)

0.6.1

Package changes:

• Added lower bound for microlens >= 0.3.0.0 to fix build failure due to Field1 not being defined (thanks Markus Hauck)

Documentation changes:

• Updated user guide and README to link to and mention microlens instead of lens

Misc:

• Fixed a qualified import in the List demo to avoid ambiguity (thanks Alan Gilbert)

0.6

API changes:

• Brick now uses the microlens family of packages instead of lens. This version of brick also depends on vty 5.5.0, which was modified to use microlens instead of lens. This change shouldn't impact functionality but will greatly reduce build times.

0.5.1

Bug fixes:

• Fix negative cropping in hCenter, vCenter, and cropResultToContext (fixes #52)
• Remove unnecessary Eq constraint from listReplace (fixes #48; thanks sifmelcara)
• Mention Google Group in README

0.5

Functionality changes:

• Markup: make markup support multi-line strings (fixes #41)
• brick-edit-demo: support shift-tab to switch editors
• Core: improve box layout algorithm (when rendering boxes, track remaining space while rendering high-priority children to use successively more constrained primary dimensions)
• Core: make fixed padding take precedence over padded widgets (fixes #42) Prior to this commit, padding a widget meant that if there was room after rendering the widget, the specified amount of padding would be added. This meant that under tight layout constraints padding would disappear before a padded widget would. This is often a desirable outcome but it also led to unexpected behavior when adding padding to a widget that grows greedily: fixed padding would never show up because it was placed in a box adjacent to the widget in question, and boxes always render greedy children before fixed ones. As a result fixed padding would disappear under these conditions. Instead, in the case of fixed padding, since we often intend to guarantee that padding is present, all of the padding combinators have been modified so that when the padded widget is rendered with fixed padding in the amount V, the widget is given V fewer rows/columns when it is rendered so that the padding always has room.

0.4.1

Bug fixes:

• Fixed a bug in the 'visible' combinator: If the size of the visibility request was larger than the available space, then the rendering of a viewport was toggling between two states, one with aligning on the end of the visibility request, and another one aligning on the start. This commit fixes it so that a visibility request is always aligned on the start if not enough space is available. (thanks Thomas Strobel ts468@cam.ac.uk)

Behavior changes:

• Honor multiple 'visible' markers in a single viewport with preference on the innermost request (thanks Thomas Strobel ts468@cam.ac.uk)

0.4

API changes:

• Added Brick.Widgets.Core.unsafeLookupViewport to make certain kinds of custom widget implementations easier when viewport states are needed (thanks Markus Hauck markus1189@gmail.com)
• List: added listClear and listReverse functions (thanks Markus Hauck)
• List: Derive instances for Functor, Foldable, Traversable (thanks Markus Hauck)

Documentation changes:

• Hyperlink "Data.Text.Markup" inside Brick.Markup haddock (thanks Markus Hauck)
• Fix typo in 'Attribute Management' section of user guide (thanks Markus Hauck)

0.3.1

Bug fixes:

• EventM newtype again instances MonadIO (thanks Andrew Rademacher)

0.3

API changes:

• Made EventM a newtype instead of a type alias
• List: listReplace now takes the new selected index and no longer does element diffing

Package changes:

• Removed the dependency on the Diff package

Misc:

• Applied some hlint hints (thanks Markus Hauck markus1189@gmail.com)
• Fixed a typo in the README (thanks Markus Hauck markus1189@gmail.com)
• Improved the renderList documentation (thanks Profpatsch mail@profpatsch.de)
• Types: added an explicit import of Applicative for older GHCs

0.2.3

Bug fixes:

• Fixed viewport behavior when the image in a viewport reduces its size enough to render the viewport offsets invalid. Before, this behavior caused a crash during image croppin in vty; now the behavior is handled sanely (fixes #22; reported by Hans-Peter Deifel)

0.2.2

Demo changes:

• Improved the list demo by using characters instead of integers in the demo list and cleaned up item-adding code (thanks Jøhannes Lippmann code@schauderbasis.de)

0.2.1

Bug fixes:

• List:
  • Fixed size policy of lists so that rather than being Fixed/Fixed, they are Greedy/Greedy. This resolves issues that arise when the box layout widget renders a list widget alongside a Fixed/Fixed one. (Closes issue #17, thanks Karl Voelker)
• Scrolling:
  • vScrollPage actually scrolls vertically now rather than horizontally (Thanks Hans-Peter Deifel hpd@hpdeifel.de)

0.2

API changes:

• Added top-level Brick module that re-exports the most important modules in the library.
• List:
  • Now instead of passing the item-drawing function to the list state constructor, it is passed to renderList
  • renderList now takes the row height of the list's item widgets. The list item-drawing function must respect this in order for scrolling to work properly. This change made it possible to optimize the list so that it only draws widgets visible in the viewport rather than rendering all of the list's items (even the ones off-screen). But to do this we must be able to tell in advance how high each one is, so we require this parameter. In addition this change means that lists no longer support items of different heights.
  • The list now uses Data.Vector instead of [a] to store items; this permits efficient slicing so we can do the optimized rendering described above.
• The HandleEvent type class handleEvent method now runs in EventM. This permits event-handling code implemented in terms of HandleEvent to do get access to viewport state and to run IO code, making it just as powerful as code in the top-level EventM handler.
• Many types were moved from Brick.Widgets.Core and Brick.Main to Brick.Types, making the former module merely a home for Widget constructors and combinators.
• The IsString instance for Widget was removed; this might be reinstated later, but this package provides enough IsString instances that things can get confusing.
• EventM is now reader monad over the most recent rendering pass's viewport state, in addition to being a state monad over viewport requests for the renderer. Added the lookupViewport function to provide access to the most recent viewport state. Exported the Viewport type and lenses.
• Now that handleEvent is now an EventM action, composition with continue et al got a little messier when using lenses to update the application state. To help with this, there is now handleEventLensed.

Bugfixes:

• Lists now perform well with 10 items or a million (see above; fixes #7, thanks Simon Michael)
• Added more haddock notes to Brick.Widgets.Core about growth policies.
• Forced evaluation of render states to address a space leak in the renderer (fixes #14, thanks Sebastian Reuße seb@wirrsal.net)
• str: only reference string content that can be shown (eliminates a space leak, fixes #14, thanks Sebastian Reuße seb@wirrsal.net)

Misc:

• Added a makefile for the user guide.
• List: added support for Home and End keys (thanks Simon Michael)
• Viewports: when rendering viewports, scroll requests from EventM are processed before visibility requests from the rendering process; this reverses this previous order of operations but permits user-supplied event handlers to reset viewports when desired.

Package changes:

• Added deepseq dependency

0.1

Initial release