How to sort a CharmListView with a specific order? - gluon-mobile

Question

Is it possible to sort a CharmListView in a specific order ?
The list contains the names of the BLE bluetooth devices in range. How to do a sort in the following way ? :
If the device contains a character string :1- then this device belongs to Category XYZ;
if the character string contains :2- then this device belongs to Category XXX. etc ...
When displaying the CharmListView we should see firstly Category XYZ , then Category ABC
In CharmListView example The sorting is done with this code snippet :
if(ascending){
charmListView.setHeaderComparator((d1,d2) -> d1.compareTo(d2));
charmListView.setComparator((s1,s2) -> Double.compare(s1.getDensity(), s2.getDensity()));
ascending = false;
} else {
charmListView.setHeaderComparator((d1,d2) -> d2.compareTo(d1));
charmListView.setComparator((s1,s2) -> Double.compare(s2.getDensity(), s1.getDensity()));
ascending = true;
}
I do not understand how charmListView.setHeaderComparator((d1,d2) -> d2.compareTo(d1)); and
CharmListView.setComparator((s1,s2) -> Double.compare(s2.getDensity(), s1.getDensity())); are working.
By default, the headers are sorted in natural order (alphabetically). How to not sort alphabetically but just with a specific order that I provide ?
Category XYZ should be on top
This is the source code of the class where the CharmListView is created.
package com.hacare.views;
import com.gluonhq.attach.ble.BleDevice;
import com.gluonhq.attach.ble.BleService;
import com.gluonhq.charm.glisten.application.MobileApplication;
import com.gluonhq.charm.glisten.control.AppBar;
import com.gluonhq.charm.glisten.control.CharmListCell;
import com.gluonhq.charm.glisten.control.CharmListView;
import com.gluonhq.charm.glisten.control.ListTile;
import com.gluonhq.charm.glisten.mvc.View;
import com.gluonhq.charm.glisten.visual.MaterialDesignIcon;
import com.hacare.objects.MyBleDevice;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
public class PrimaryPresenter {
/**
* List of ble devices nearby
*/
ObservableList<BleDevice> ble_device_list = FXCollections.observableArrayList();
#FXML
private View primary;
#FXML
private CharmListView<BleDevice, String> ble_device_charmlistview;
/**
* Controller init function
*/
public void initialize() {
primary.showingProperty().addListener((obs, oldValue, newValue) -> {
if (newValue) {
AppBar appBar = MobileApplication.getInstance().getAppBar();
appBar.setNavIcon(MaterialDesignIcon.MENU.button(e ->
MobileApplication.getInstance().getDrawer().open()));
appBar.setTitleText("Primary");
appBar.getActionItems().add(MaterialDesignIcon.BLUETOOTH.button(e ->
buttonClick()));
}
});
ble_device_charmlistview.setHeadersFunction(MyBleDevice::getO_device_type);
ble_device_charmlistview.setComparator((o1, o2) -> {
if(o2.getName().contains(":1-")){
//test statement
return 1;
}
//test statement
return 0;
});
ble_device_charmlistview.setCellFactory(bleDeviceStringCharmListView -> new CharmListCell<BleDevice>(){
#Override
public void updateItem(BleDevice item, boolean empty) {
super.updateItem(item, empty);
if(item!=null && !empty){
ListTile tile = new ListTile();
tile.textProperty().add(item.getName());
Image image = new Image("/icon.png");
if(item.getName().contains("HAcare_Y4")){
image = new Image("imgs/y-type-y4_64x64.jpg");
}
else{
image = new Image("/icon.png");
}
tile.setPrimaryGraphic(new ImageView(image));
setText(null);
setGraphic(tile);
}
}
});
ble_device_charmlistview.selectedItemProperty().addListener((observableValue, bleDevice, t1) ->
{
System.out.println(ble_device_charmlistview.getSelectedItem().getAddress());
}
);
}
#FXML
void buttonClick() {
ble_device_list.clear();
//dummy devices
BleDevice device1 = new BleDevice();
device1.setAddress("AB:CD:EF:GH:IJ:KL");
device1.setName("HAcare_Y4:1-CW71");
BleDevice device2 = new BleDevice();
device2.setAddress("MN:CD:EZ:AH:FJ:CL");
device2.setName("dummy device");
BleDevice device3 = new BleDevice();
device3.setAddress("AK:CD:ED:FE:AJ:KL");
device3.setName("HAcare_Y4:1-AZ5K");
ble_device_list.add(device1);
ble_device_list.add(device2);
ble_device_list.add(device3);
ble_device_charmlistview.setItems(ble_device_list);
BleService.create().ifPresent(ble ->
ble.startScanningDevices().addListener((ListChangeListener.Change<? extends BleDevice> c) -> {
while (c.next()) {
if (c.wasAdded()) {
for (BleDevice device : c.getAddedSubList()) {
System.out.println("Device found: " + device.getName());
ble_device_list.add(device);
ble_device_charmlistview.setItems(ble_device_list);
}
}
}
}));
}
}