我已經開始為March Madness 括號生成器創建一個 GUI，方法是顯示第 1 輪的所有 64 支球隊，Labels現在我正在嘗試ComboBox為每場比賽創建一個下拉菜單。我已經ComboBox為 2 個匹配項創建了一個，現在我想創建一個新的ComboBox，它從它之前的其他兩個匹配項中提取它的選項ComboBox。所以在下面的示例圖中，newComboBox應該有Duke和VCU選項供用戶選擇。 (2 combo boxes) (new combo box)Duke------ Duke --- ND St. --- XVCU ----- VCU ---UCF ----- 我該怎么做？public class ControlPanel extends Application{ @Override public void start(Stage primaryStage) { primaryStage.setTitle("March Madness 2019 Generator"); BorderPane componentLayout = new BorderPane(); componentLayout.setPadding(new Insets(20,0,20,20)); final FlowPane choicePane = new FlowPane(); choicePane.setHgap(100); Label choiceLbl = new Label("Match1"); ArrayList<Team> round1 = new ArrayList<Team>(); round1.add(new Team("Duke", 0.670, 1)); //0 round1.add(new Team("North Dakota St", 0.495, 16)); round1.add(new Team("VCU", 0.609, 8)); round1.add(new Team("UCF", 0.606, 9)); //The choicebox is populated from an observableArrayList ChoiceBox r2Match1 = new ChoiceBox(FXCollections.observableArrayList( match(round1, 0, 1) )); //Add the label and choicebox to the flowpane choicePane.getChildren().add(choiceLbl); choicePane.getChildren().add(r2Match1); //put the flowpane in the top area of the BorderPane componentLayout.setTop(choicePane); //Add the BorderPane to the Scene Scene appScene = new Scene(componentLayout,500,500); //Add the Scene to the Stage primaryStage.setScene(appScene); primaryStage.show(); } private ArrayList<Team> match(ArrayList<Team> roundPullFrom, int team1, int team2) { ArrayList<Team> temp = new ArrayList<Team>(); temp.add(roundPullFrom.get(team1)); temp.add(roundPullFrom.get(team2)); return temp; }}
2 回答
慕尼黑8549860
TA貢獻1818條經驗 獲得超11個贊
使用我之前的回答ComboBox中發布的方法成對組合es，直到只剩下一個.ComboBox
下面的代碼也以類似于樹結構的方式布置節點，但是您可以通過將每一輪保留在數據結構中而不是覆蓋單個數組的值來輕松解耦布局。（由于您需要訪問數據，因此無論如何您都應該將組合存儲在適當的數據結構中。）
private static ComboBox<String> createCombo(double x, double y, double width) {
ComboBox<String> comboBox = new ComboBox<>();
comboBox.setLayoutX(x);
comboBox.setLayoutY(y);
comboBox.setMaxWidth(Region.USE_PREF_SIZE);
comboBox.setMinWidth(Region.USE_PREF_SIZE);
comboBox.setPrefWidth(width);
return comboBox;
}
private static Label createLabel(String text, double maxWidth) {
Label label = new Label(text);
label.setMaxWidth(maxWidth);
return label;
}
@Override
public void start(Stage primaryStage) {
String[] teams = new String[64];
for (int i = 0; i < teams.length; i++) {
teams[i] = Integer.toString(i);
}
final double offsetY = 30;
final double offsetX = 100;
final double width = 90;
Pane root = new Pane();
// array storing the comboboxes
// combos for previous round are at the lowest indices
ComboBox<String>[] combos = new ComboBox[teams.length / 2];
// create initial team labels & comboboxes
for (int i = 0, offsetTeams = 0; i < combos.length; i++, offsetTeams += 2) {
Label label = createLabel(teams[offsetTeams], width);
double y = offsetTeams * offsetY;
label.setLayoutY(y);
root.getChildren().add(label);
label = createLabel(teams[offsetTeams+1], width);
label.setLayoutY(y+offsetY);
ComboBox<String> comboBox = createCombo(offsetX, y + offsetY / 2, width);
comboBox.getItems().addAll(teams[offsetTeams], teams[offsetTeams+1]);
combos[i] = comboBox;
root.getChildren().addAll(label, comboBox);
}
double x = 2 * offsetX;
int count = combos.length / 2; // combos still left for the next round
for (; count > 0; count /= 2, x += offsetX) { // for each round
// create comboboxes combining the combos from previous round pairwise
for (int i = 0, ci = 0; i < count; i++, ci+=2) {
// get combos pairwise
ComboBox<String> c1 = combos[ci];
ComboBox<String> c2 = combos[ci+1];
ComboBox<String> combo = createCombo(x, (c1.getLayoutY() + c2.getLayoutY()) / 2, width) ;
// combine data from previous round
ChangeListener<String> listener = (o, oldValue, newValue) -> {
final List<String> items = combo.getItems();
int index = items.indexOf(oldValue);
if (index >= 0) {
if (newValue == null) {
items.remove(index);
} else {
items.set(index, newValue);
}
} else if (newValue != null) {
items.add(newValue);
}
};
c1.valueProperty().addListener(listener);
c2.valueProperty().addListener(listener);
root.getChildren().add(combo);
combos[i] = combo;
}
}
primaryStage.setScene(new Scene(new ScrollPane(root), 600, 400));
primaryStage.show();
}
忽然笑
TA貢獻1806條經驗 獲得超5個贊
你的問題的結構是一棵樹。所以您可能希望您的解決方案支持該結構。您可以使用二叉樹數據結構來模擬錦標賽，或者您可以通過以下類創建這樣的結構：
class Team {
String name;
}
class Match {
Team teamA;
Team teamB;
String where;
Date when;
public Team selectWinner() {
...
}
}
class Tournament {
List<Team> teams;
List<Match> getMatches(int round,List<Team> teams) {
List<Match> matches=new ArrayList<Match>)();
if (round==1) {
for (teamIndex=1;teamIndex<=teams.size();teamIndex+=2) {
Match match=new Match(teams[teamIndex-1],teams(teamIndex)];
matches.add(match);
}
} else {
List<Team> winners=new ArrayList<Team>();
for (Match match:getMatches(round-1)) {
winners.add(match.selectWinner());
}
return getMatches(1,winners);
}
}
}
從這個結構中，您可以派生必要的 gui 組件，使選擇動態化，并讓 GUI 組件從 Tournament、Match 和 Team 類中獲取它們的值。
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