setStyleGenerator depends on cell value

Question

I need to know how to use grid's setStyleGenerator for each cell depends on its value.

For example: for number column, I want every minus value (less than zero) has red text color.

I already know how to setting style for entire column.

addColumn(...).setStyleGenerator(...)

Answer 1

Assuming your grid bean (lets call it GridExampleBean for now) has a property/field of number, the following should accomplish adding the style name of "red" to your grid cell when that grid row's item numbner property is less than zero:

Grid<GridExampleBean> grid = new Grid<GridExampleBean>(GridExampleBean.class);
// you can also use the getColumn method too :  grid.getColumn("number").
grid.addColumn(...)
        .setStyleGenerator((StyleGenerator<GridExampleBean>) item -> {
    if (item.getNumber() < 0) {
        return "red";
    }
    return "notRed";
});