F
Filament•3d ago
JanV

Listen to Theme Switcher Event or Read the Current Theme Mode State

Hey, I would like to know how a widget (a ChartWidget) is aware of the current theme mode. The goal is, I want the chart border color changes depending on the current theme mode. If it is dark, I want to use lighter colors for better contrast. If the theme is system (light), the changes to another color. While researching, I found out that the theme swticher in filament has the following component structure. 
<div
    x-data="{ theme: null }"
    x-init="
        $watch('theme', () => {
            $dispatch('theme-changed', theme)
        })

        theme = localStorage.getItem('theme') || @js(filament()->getDefaultThemeMode()->value)
    "
    class="fi-theme-switcher grid grid-flow-col gap-x-1"
>
    <x-filament-panels::theme-switcher.button
        icon="heroicon-m-sun"
        theme="light"
    />

    <x-filament-panels::theme-switcher.button
        icon="heroicon-m-moon"
        theme="dark"
    />

    <x-filament-panels::theme-switcher.button
        icon="heroicon-m-computer-desktop"
        theme="system"
    />
</div>
<div
    x-data="{ theme: null }"
    x-init="
        $watch('theme', () => {
            $dispatch('theme-changed', theme)
        })

        theme = localStorage.getItem('theme') || @js(filament()->getDefaultThemeMode()->value)
    "
    class="fi-theme-switcher grid grid-flow-col gap-x-1"
>
    <x-filament-panels::theme-switcher.button
        icon="heroicon-m-sun"
        theme="light"
    />

    <x-filament-panels::theme-switcher.button
        icon="heroicon-m-moon"
        theme="dark"
    />

    <x-filament-panels::theme-switcher.button
        icon="heroicon-m-computer-desktop"
        theme="system"
    />
</div>
` From this piece I see that an event is dispatched. I guess this is a livewire event, isn't it? When I try to listen in with the On attribute 
    #[On('theme-changed')]
    public function handleThemeChange($theme): void
    {
        $this->theme = $theme;
        $this->updateChartData();
    }
    #[On('theme-changed')]
    public function handleThemeChange($theme): void
    {
        $this->theme = $theme;
        $this->updateChartData();
    }
I receive the following error. 
Only arrays and Traversables can be unpacked
Only arrays and Traversables can be unpacked
Is there another way or approach to acccess the current theme mode? Thanks in advance for any hint/help.
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