[tw5] Any way to force a refresh upon window events?

[AdamS]

I'm trying to build a widget that fills a state tiddler with information about the window and document dimensions. I'm wanting to refresh the widget whenever the window is resized or document offsetHeight changes, rather than whenever a tiddler is changed. Anyone know of any way to do that?

[Jeremy Ruston]

Hi Adam

I'm trying to build a widget that fills a state tiddler with information about the window and document dimensions. I'm wanting to refresh the widget whenever the window is resized or document offsetHeight changes, rather than whenever a tiddler is changed. Anyone know of any way to do that?

You can construct a widget that refreshes whenever the viewport size changes using the DynaView plugin. It maintains a state tiddler $:/state/DynaView/ViewportDimensions/ResizeCount that contains a count that is incremented at each refresh. Widgets can check for modifications to that tiddler in their refresh method. For example:

if(changedTiddlers["$:/state/DynaView/ViewportDimensions/ResizeCount"]) {

foo()

}

The DynaView plugin also saves the viewport size in the tiddlers $:/state/DynaView/ViewportDimensions/Width and $:/state/DynaView/ViewportDimensions/Height, although it doesn’t track changes to the rendered document size.

The DynaView plugin can be installed from the official plugin library, and you can try it out here:

https://tiddlywiki.com/plugins/tiddlywiki/dynaview/#%24%3A%2Fplugins%2Ftiddlywiki%2Fdynaview

Best wishes

Jeremy.

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[AdamS]

Thank you, Jeremy!

That's good news. Thanks for saving me from trying to reinvent the wheel!

Best regards,

Adam