Hi Jan, BurningTreeC,

Just to let you know that 5.1.16 includes the following features that you can 
try out in the prerelease at https://tiddlywiki.com/prerelease 
<https://tiddlywiki.com/prerelease>

* The core now reports the browser screen size in $:/info/browser/screen/width 
and $:/info/browser/screenheight
* As BurningTreeC notes, a new feature of the DynaView plugin that reports the 
current viewport size dynamically
* Support for "startup actions": action widgets that are executed at startup — 
see https://tiddlywiki.com/prerelease/#StartupActions 
<https://tiddlywiki.com/prerelease/#StartupActions>
* Riz’s updates to the reveal widget have landed, too — see 
https://tiddlywiki.com/prerelease/#RevealWidget 
<https://tiddlywiki.com/prerelease/#RevealWidget>

With these features it is possible to build UIs that respond to differences in 
the screen size by hiding and showing features in wikitext, instead of the 
usual approach of CSS media queries. (The main advantage of the wikitext 
approach is performance: features hidden with CSS are still rendered and still 
incur an overhead).

Startup actions also make it easier to reset configuration settings at startup.

Best wishes

Jeremy.

> On 28 Mar 2018, at 09:35, BurningTreeC <[email protected]> wrote:
> 
> @Jan ,
> 
> Yes you can use the viewport-thing for that, it's now bundled in the dynaview 
> plugin from the prerelease page,
> I recommend using that. Just enable saving the viewport dimensions in the 
> plugin's settings tab,
> then you'll have two tiddlers $:/state/dynaview/viewportdimension/width and 
> $:/state/dynaview/viewportdimensions/height whose values update dynamically 
> every time the viewport size changes
> 
> Then you can make your Buttons like that:
> 
> \define compareViewportLow()
> <$list 
> filter="[{$:/state/DynaView/ViewportDimensions/Width}regexp[^$(lowValue)$$]]">
> <$button><$actions when viewport low/><$actions more actions/></$button>
> </$list>
> \end
> \define compareViewportHigh()
> <$list 
> filter="[{$:/state/DynaView/ViewportDimensions/Width}regexp[^$(highValue)$$]]">
> <$button><$actions when viewport high/></$button>
> </$list>
> \end
> <$list filter="[list[$:/numbers/viewport-low]]" variable="lowValue">
> <<compareViewportLow>>
> </$list>
> <$list filter="[list[$:/numbers/viewport-high]]" variable="highValue">
> <<compareViewportHigh>>
> </$list>
> 
> I'm using two tiddlers here that store values from 1 to the breakpoint for 
> "viewport low" in the list field of $:/numbers/viewport-low and values from 
> the breakpoint for "viewport low + 1" to a high value in the list field of 
> $:/numbers/viewport-high
> 
> You can get a tiddler with all numbers from 1 to 9999 here: 
> http://tiddlytouch.tiddlyspot.com/#%24%3A%2Fplugins%2FBTC%2Ftiddly-touch%2Flists%2Fnumbers
> 
> Then you can split the list field at the value you choose for your breakpoint 
> and make two tiddlers from it
> 
> 
> That's one idea,
> The other one is using Riz's version of the reveal widget, which can compare 
> values with lt (less than) gt (greater than) and gteq and lteq 
> (greater/equal, less/equal)
> It could also make it to the next tiddlywiki release, but at the moment it's 
> not at the prerelease page as far as I know 
> 
> You can find it here: 
> https://ibnishak.github.io/Tesseract/pluginsandmacros/index.html#Reveal-Extended%3A%20Adding%20%3C%2C%3E%2C%3C%3D%2C%3E%3D%20types%20to%20reveal%20widget
> 
> Using this is easier than my version above - you won't need the two 
> number-tiddlers!
> 
> 
> Simon
> 
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