Customizing context menu

@vnkdj5 wrote:

if (diagram instanceof go.Palette)
return;

Example:
indent preformatted text by 4 spaces
function showContextMenu(obj, diagram, tool) {
// Show only the relevant buttons given the current state.
var cmd = diagram.commandHandler;
/*
document.getElementById(“cut”).style.display = cmd.canCutSelection() ? “block” : “none”;
document.getElementById(“copy”).style.display = cmd.canCopySelection() ? “block” : “none”;
document.getElementById(“paste”).style.display = cmd.canPasteSelection() ? “block” : “none”;
*/
document.getElementById(“delete”).style.display = (obj !== null && cmd.canDeleteSelection()) ? “block” : “none”;
document.getElementById(“componentConfig”).style.display = (obj !== null ? “block” : “none”);
//more such components

        if (obj instanceof go.Node) {
            //Setting selected component for further processing
            $scope.selectedComponent.category = obj.data.category;
            $scope.selectedComponent.key = obj.data.key;

        }
        if (diagram instanceof go.Palette)      //don't show context menu for palette elements
            return;
        // Now show the ,whole context menu element
        cxElement.style.display = "block";
        // we don't bother overriding positionContextMenu, we just do it here:
        var mousePt = diagram.lastInput.viewPoint;
        cxElement.style.left = mousePt.x + "px";
        cxElement.style.top = mousePt.y + "px";
    }

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