perspective-viewer 5.6.1

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// ┃ Copyright (c) 2017, the Perspective Authors.                              ┃
// ┃ ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ ┃
// ┃ This file is part of the Perspective library, distributed under the terms ┃
// ┃ of the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0). ┃
// ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

use yew::prelude::*;

use super::{ColumnLocator, ColumnSettingsTarget};
use crate::utils::left_click;

#[derive(Clone, PartialEq, Properties)]
pub struct AddExpressionButtonProps {
    // Fires when this button is clicked.
    pub on_open_expr_panel: Callback<ColumnSettingsTarget>,

    /// The column this butotn will open configuration for.
    pub selected_column: Option<ColumnLocator>,
}

/// The "New Column" row; hover is CSS so a drag's stray `mouseover` cannot
/// pin the highlight.
#[function_component]
pub fn AddExpressionButton(p: &AddExpressionButtonProps) -> Html {
    let onmousedown = left_click(
        p.on_open_expr_panel
            .reform(|_| ColumnSettingsTarget::NewExpression),
    );

    let class = if matches!(p.selected_column, Some(ColumnLocator::NewExpression)) {
        classes!("dragdrop-hover")
    } else {
        classes!()
    };

    html! {
        <div id="add-expression" data-index="-1" {class} {onmousedown}>
            <span class="icon" />
            <span id="add-expression-button" />
        </div>
    }
}