[tannevaled]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/go-widgets/mvvm	v0.11.0 → v0.13.0
github.com/go-widgets/toolkit	v0.326.0 → v0.328.0

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Release Notes

go-widgets/mvvm (github.com/go-widgets/mvvm)

v0.13.0: — bind a cycle button and a command

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tkbind can bind a cycle button and a command

Two shapes an app could not bind with what was here, and wrote by hand instead — one direction each, in the consumer (#​32).

A cycle button holds a position, not a value. A quarter turn is 90, 180 or 270 and the button sits at 0, 1 or 2, so there is nothing for an index-to-index binding to keep equal. BindCycleValues takes the table — values[i] is what position i means — and binds both ways through it; BindCycle is the plain index case, clamped. A value the table has not got settles on the first position and is written back, because a model left holding 45 while the button shows a quarter turn is two sides with two answers.

A button that checks its own preconditions is a button that looks pressable. BindButton gives a Button a Command: pressing executes, and CanExecute drives Disabled, so the rule lives once instead of being re-checked inside every handler.

100% of statements; nine mutations, all caught. One survived the first run — replacing the range check on an incoming position with if true — because Index() is an Observable with no guard, anything can Set a position the table has no value for, and values[i] there is a panic rather than a wrong answer.

v0.12.0: — bind a box, a spinner, a list and a tick

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tkbind can bind the four everyday controls

tkbind had binders for a Browser, a Table, a Container and a RangeSlider — and none for the text box, the spin button, the drop-down and the tick box, which are the four an app reaches for first. BindEntry, BindSpin, BindChoice and BindCheck fill that in (#​31).

Without them an app binds these by hand, and hand-binding settles into a Subscribe that copies the value into a plain field plus a rebuild to get it back — a field copied across a boundary plus an imperative resync, which is the shape MVVM exists to remove.

The clamping happens in the observable, before the link exists, which is not where it looks like it belongs. SpinButton.SetValue clamps to [Min, Max] and DropDown.Select refuses an index it has no option for — but BindTwoWay seeds the destination by writing its Observable, which is neither of those paths. A ViewModel asking for option nine of three therefore puts the list on nine, and normalising afterwards cannot fix it, because the fix would be to call Select, and Select is the guard that just declined.

100% of statements, eight mutations all caught — each link severed, each clamp disabled at both ends.

go-widgets/toolkit (github.com/go-widgets/toolkit)

v0.328.0

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Table.CellFill: per-cell backgrounds (heatmaps), text inked by WCAG contrast, selection band kept, nil renders as before. New toolkit.Viridis and toolkit.ContrastInk. Entry: the caret is clamped after an external Text().Set, so a Backspace before the next Draw no longer panics. #​483

v0.327.0

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New XYPlot widget: numeric series against labelled axes on 1-2-5 ticks, line/stem/marker styles, legend, hover readout, one stroke per pixel column for long series. Registered in the MVVM gate and the bounds sweep. #​484

v0.326.1

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Entry: a click places the caret under the pointer when the field is not at the surface's left edge (the Entry subtracted its own X from an already widget-local coordinate, so the caret went to 0). #​485

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