blazor-theme-and-size-mode-switcher/CS/switcher/switcher/Components/ThemeSwitcher/ThemeSwitcherContainer.razor at 25.2.3+ · DevExpress-Examples/blazor-theme-and-size-mode-switcher · GitHub

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@using DevExpress.Blazor
@using System.Text.RegularExpressions
@inject ThemesService ThemesService

@rendermode InteractiveServer

<div class="theme-@ThemesService.ActiveTheme?.Name themeswitcher-container @StateCssClass">
    <div class="themeswitcher-content">
        <div class="themeswitcher-title">DevExpress Fluent</div>
        <ul class="themeswitcher-colors">
            <ThemeSwitcherItem Theme="ThemesCollection.FluentLight()" Title="Fluent Light"
                               Click="OnThemeChange" />
            <ThemeSwitcherItem Theme="ThemesCollection.FluentDark()" Title="Fluent Dark"
                               Click="OnThemeChange" />
        </ul>
        <div class="themeswitcher-subtitle">Custom Color</div>
        <div class="themeswitcher-custom-color active">
            <DxMaskedInput ValueChanged="e => OnFluentSetCustomAccentColor(e)"
                           T="string"
                           Mask="#([0-9a-fA-F]{6})"
                           MaskMode="MaskMode.RegEx"
                           NullText="#hex"
                           Value="@GetColorPickerText()" />
            <DxButton CssClass="themeswitcher-custom-color-button"
                      RenderStyle="ButtonRenderStyle.Secondary"
                      RenderStyleMode="ButtonRenderStyleMode.Contained"
                      IconCssClass="themeswitcher-custom-color-button-icon">
                <div class="themeswitcher-custom-color-button-icon">
                </div>
                <input type="color" value="@GetColorPickerText()" @onchange="(e) => OnFluentSetCustomAccentColor(e.Value?.ToString())" />
            </DxButton>
        </div>
    </div>
    <div class="themeswitcher-content">
        <div class="themeswitcher-title">DevExpress Classic</div>
        <ul class="themeswitcher-colors">
            <ThemeSwitcherItem Theme="ThemesCollection.BlazingBerry" Title="Blazing Berry"
                               Click="OnThemeChange" />
            <ThemeSwitcherItem Theme="ThemesCollection.BlazingDark" Title="Blazing Dark"
                               Click="OnThemeChange" />
            <ThemeSwitcherItem Theme="ThemesCollection.Purple"
                               Click="OnThemeChange" />
            <ThemeSwitcherItem Theme="ThemesCollection.OfficeWhite" Title="Office White"
                               Click="OnThemeChange" />
        </ul>
    </div>
    <div class="themeswitcher-content">
        <div class="themeswitcher-title">Bootstrap</div>
        <ul class="themeswitcher-colors">
            <ThemeSwitcherItem Theme="ThemesCollection.BootstrapDefault"
                               Click="OnThemeChange" />
        </ul>
    </div>
</div>

@code {
    [Parameter] public bool Shown { get; set; }
    [Parameter] public EventCallback<bool> ShownChanged { get; set; }

    const string hexRegexStr = "#([0-9a-fA-F]{6})";
    string? CustomAccentColor = "";

    string StateCssClass => Shown ? "themeswitcher-container-shown" : "themeswitcher-container-hidden";

    async Task OnThemeChange(ITheme theme) {
        CustomAccentColor = null;
        await ThemesService.SetActiveThemeAsync(theme);
        await ToggleThemeSwitcherPanel(false);
    }

    async Task OnFluentSetCustomAccentColor(string? color) {
        if (string.IsNullOrEmpty(color) || !Regex.IsMatch(color, hexRegexStr))
            return;
        CustomAccentColor = color;

        await ThemesService.SetActiveThemeAsync(ThemesService.ActiveTheme, color);
        await ToggleThemeSwitcherPanel(false);
    }

    async Task ToggleThemeSwitcherPanel(bool shown) {
        if (shown != Shown) {
            Shown = shown;
            await ShownChanged.InvokeAsync(shown);
        }
    }

    private string? GetColorPickerText() {
        return string.IsNullOrEmpty(CustomAccentColor) ? null : CustomAccentColor;
    }
}