Function setupTitleToggle

src/components/legend/draw.js:670–734

(scrollBox, gd, legendObj, legendId)

}

function setupTitleToggle(scrollBox, gd, legendObj, legendId) {
    // For now, skip title click for legends containing pie-like traces
    const hasPie = gd._fullData.some(function(trace) {
        const legend = trace.legend || 'legend';
        const inThisLegend = Array.isArray(legend) ? legend.includes(legendId) : legend === legendId;
        return inThisLegend && Registry.traceIs(trace, 'pie-like');
    });
    if(hasPie) return;

    const doubleClickDelay = gd._context.doubleClickDelay;
    var newMouseDownTime;
    var numClicks = 1;

    const titleToggle = Lib.ensureSingle(scrollBox, 'rect', legendId + 'titletoggle', function(s) {
        if(!gd._context.staticPlot) {
            s.style('cursor', 'pointer').attr('pointer-events', 'all');
        }
        s.call(Color.fill, 'rgba(0,0,0,0)');
    });

    if(gd._context.staticPlot) return;

    titleToggle.on('mousedown', function() {
        newMouseDownTime = (new Date()).getTime();
        if(newMouseDownTime - gd._legendMouseDownTime < doubleClickDelay) {
            // in a click train
            numClicks += 1;
        } else {
            // new click train
            numClicks = 1;
            gd._legendMouseDownTime = newMouseDownTime;
        }
    });
    titleToggle.on('mouseup', function() {
        if(gd._dragged || gd._editing) return;

        if((new Date()).getTime() - gd._legendMouseDownTime > doubleClickDelay) {
            numClicks = Math.max(numClicks - 1, 1);
        }

        const evtData = {
            event: d3.event,
            legendId: legendId,
            data: gd.data,
            layout: gd.layout,
            fullData: gd._fullData,
            fullLayout: gd._fullLayout
        };

        if(numClicks === 1 && legendObj.titleclick) {
            const clickVal = Events.triggerHandler(gd, 'plotly_legendtitleclick', evtData);
            if(clickVal === false) return;

            legendObj._titleClickTimeout = setTimeout(function() {
                if(gd._fullLayout) handleTitleClick(gd, legendObj, legendObj.titleclick);
            }, doubleClickDelay);
        } else if(numClicks === 2) {
            if(legendObj._titleClickTimeout) clearTimeout(legendObj._titleClickTimeout);