processEvent

pub fn processEvent(self: *KeyboardNavigation, e: *Event, grid: *GridWidget, cellConverter: fn (
        grid: *GridWidget,
        point: Point.Physical,
    ) ?Cell) void {
        defer self.enforceCursorLimits();
        switch (e.evt) {
            .key => |*ke| {
                if (!self.is_focused or e.handled) return;
                if (ke.action == .down or ke.action == .repeat) {
                    if (ke.matchKeyBind(self.navigation_keys.first)) {
                        e.handle(@src(), grid.data());
                        self.scrollTo(0, 0);
                    } else if (ke.matchKeyBind(self.navigation_keys.last)) {
                        e.handle(@src(), grid.data());
                        self.scrollTo(self.num_cols - 1, self.num_rows - 1);
                    } else if (ke.matchKeyBind(self.navigation_keys.col_first)) {
                        e.handle(@src(), grid.data());
                        self.scrollTo(0, self.cursor.row_num);
                    } else if (ke.matchKeyBind(self.navigation_keys.col_last)) {
                        e.handle(@src(), grid.data());
                        self.scrollTo(self.num_cols - 1, self.cursor.row_num);
                    } else if (ke.matchKeyBind(self.navigation_keys.scroll_up)) {
                        e.handle(@src(), grid.data());
                        self.scrollBy(0, -self.num_scroll);
                        grid.bsi.scrollPageUp(.vertical);
                    } else if (ke.matchKeyBind(self.navigation_keys.scroll_down)) {
                        e.handle(@src(), grid.data());
                        self.scrollBy(0, self.num_scroll);
                        grid.bsi.scrollPageDown(.vertical);
                    } else if (ke.matchKeyBind(self.navigation_keys.up)) {
                        e.handle(@src(), grid.data());
                        self.scrollBy(0, -1);
                    } else if (ke.matchKeyBind(self.navigation_keys.down)) {
                        e.handle(@src(), grid.data());
                        self.scrollBy(0, 1);
                    } else if (ke.matchKeyBind(self.navigation_keys.left)) {
                        e.handle(@src(), grid.data());
                        if (self.tab_out and self.cursor.eqColRow(0, 0)) {
                            dvui.tabIndexPrev(e.num);
                            self.is_focused = false;
                        } else {
                            self.scrollBy(-1, 0);
                        }
                    } else if (ke.matchKeyBind(self.navigation_keys.right)) {
                        e.handle(@src(), grid.data());
                        if (self.tab_out and self.cursor.eqColRow(self.num_cols - 1, self.num_rows - 1)) {
                            dvui.tabIndexNext(e.num);
                            self.is_focused = false;
                        } else {
                            self.scrollBy(1, 0);
                        }
                    }
                }
            },
            .mouse => |*me| {
                if (me.action == .focus) {
                    // pointToRowCol will return null if the mouse focus event
                    // is outside the grid.
                    const focused_cell = cellConverter(grid, me.p);
                    if (focused_cell) |cell| {
                        self.cursor.col_num = cell.col_num;
                        self.cursor.row_num = cell.row_num;
                        self.is_focused = true;
                    } else {
                        self.is_focused = false;
                    }
                }
            },
            else => {},
        }
    }