Is it possible to jump the index of flutter listview? - flutter

Question

I'm making a text game with a sf fiction writer.
This game is similar to the Japanese visual novel. The story changes through choice.
DB is using sqflite.
I am loading text via listview.builder.
The list with dialogue is named Notes. I made it with reference to the memo app and did not edit it.
But I don't want to load the index sequentially.
I thought listview.builder was a for loop. Something is different. I want to change idex but it is difficult for me.
I would like to see 4,5 when it is index 2. index 6 and 7 should not be visible.
When index 3, index 4,5 should not be visible. I wish I could jump to index 6 or 7.
Actual index 2 and 3 are buttons.
I had to post a question in a hurry, so I made a new one. Can you give me a hint?
I also upload a table I made randomly.
Even if it is different from the intention of my question, please suggest a good direction.
It's ok if it's different from my code.
Not using DB, not using sqlite, dividing DB in two, using for loop….
text_game_viewer
dialogue_db.csv
Widget Builder() {
return FutureBuilder(
builder: (context, Snap) {
if ((Snap.data as List).length == 0) {
return Container(
child: Text("add a note"),
);
}
return ListView.builder(
itemCount: (Snap.data as List).length,
itemBuilder: (context, index) {
Memo memo = (Snap.data as List)[index];
getNextItem(index) {
return Column(
children: <Widget>[
Text(
memo.title,
style: TextStyle(fontWeight: FontWeight.bold),
),
Text(memo.text),
Padding(padding: EdgeInsets.only(bottom: 20))
],
);
}
return getNextItem(index);
},
);
},
future: loadMemo(),
);}

Answer 1

I don't know if this could help you but there is a lot of solution to do that, what I can share is:
you can use Graph approach using a simple chained object list (more complex)
you can transform the dialog_db.csv to list of object.
simple demonstration that I haven't test using the csv transformation. You need to adapt the code to your needs
For eg:
class MyDialog {
final int id;
final String type;
final String char;
final String text;
final List<int> nextIds; //min element count must be 1
MyDialog(this.id, this.char, this.type, this.text, this.nextIds);
#override
String toString() {
return "$id, $char, $type, $text";
}
}
data example
var dialog = [
MyDialog(1, "Toto", "line", "First line message", [2]),
MyDialog(2, "Toto", "choice", "Yes or no?", [4,5]),
MyDialog(3, "Toto", "line", "must be hidden", [100]),
MyDialog(4, "Toto", "choice", "YES", [7]),
MyDialog(5, "Toto", "choice", "NO", [8]),
//...
];
implementation example:
void test() {
//show the dialog 1
showDialog(1);
//then 2 and his next dialog, the dialog 3 must be skiped
showDialog(2);
}
MyDialog getDialog(int id) {
return dialog.where((element) => element.id == id).first;
}
void showDialog(int id) {
var d = getDialog(id);
print(d);
for (var i in d.nextIds) {
print("next: " + getDialog(i).toString());
}
}