詳解Android Libgdx中ScrollPane和Actor事件沖突問題的解決辦法

2019-10-22 18:28:25

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詳解Android Libgdx中ScrollPane和Actor事件沖突問題的解決辦法

在Libgdx的使用過程中，經常會用到ScrollPane這個widget，來實現滑動效果，如下所示：

Android,Libgdx中ScrollPane和Actor的問題解決辦法,Libgdx中ScrollPane和Actor事件沖突問題

但是如果想在上面的效果上添加一點擴展，比如ScrollPane中的Actor可以從ScrollPane中移出來，并添加到Stage中，則需要添加額外的邏輯

具體代碼參考如下：

/** * Created by Danny.姜 on 17/7/26. */public class TestAdapter extends ApplicationAdapter {  Stage stage;  ScrollPane scrollPane;  Table table;  private float lastStageX;  private float lastStageY;  ActorGestureListener actorGestureListener;  private InputListener inputListener = new InputListener() {    @Override    public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {      Log.e("DANNY", "actor touch down");      if (pointer == 0) {        lastStageX = event.getStageX();        lastStageY = event.getStageY();        inStage = false;      }      return true;    }    @Override    public void touchDragged(InputEvent event, float x, float y, int pointer) {      Log.e("DANNY", "actor touch dragging");      Actor actor = event.getListenerActor();      if (cancelTouchFocus) {        float currentX = event.getStageX();        float currentY = event.getStageY();        actor.moveBy(currentX - lastStageX, currentY - lastStageY);        lastStageX = currentX;        lastStageY = currentY;        if (!inStage) {          Vector2 vector2 = actor.localToStageCoordinates(new Vector2());          actor.setPosition(vector2.x, vector2.y);          stage.addActor(actor);          stage.cancelTouchFocusExcept(this, actor);          inStage = true;        }      }    }    @Override    public void touchUp(InputEvent event, float x, float y, int pointer, int button) {      Log.e("DANNY", "actor touch up");      cancelTouchFocus = false;    }  };  @Override  public void create() {    super.create();    stage = new Stage();    stage.setDebugAll(true);    Gdx.input.setInputProcessor(stage);    actorGestureListener = new ActorGestureListener() {      @Override      public boolean longPress(Actor actor, float x, float y) {        Log.e("DANNY", "actor gesture listener long pressed");        cancelTouchFocus = true;        return super.longPress(actor, x, y);      }    };    table = new Table();    scrollPane = new ScrollPane(table, new ScrollPane.ScrollPaneStyle());    scrollPane.setSize(stage.getWidth(), 500);    scrollPane.setScrollingDisabled(false, true);    scrollPane.setCancelTouchFocus(false);    scrollPane.setSmoothScrolling(true);    scrollPane.setFlingTime(0);    stage.addActor(scrollPane);    initTable();  }  private boolean cancelTouchFocus = false;  private boolean inStage = false;  private void initTable() {    for (int i = 0; i < 10; i++) {      BaseGdxActor actor = new BaseGdxActor(new TextureRegion(          new Texture("badlogic.jpg")));      table.add(actor).width(actor.getWidth()).pad(10);      actor.addListener(actorGestureListener);      actor.addListener(inputListener);    }  }  @Override  public void render() {    super.render();    Gdx.gl.glClearColor(1, 1, 1, 1);    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);    stage.act();    stage.draw();  }}

實現效果如下：

Android,Libgdx中ScrollPane和Actor的問題解決辦法,Libgdx中ScrollPane和Actor事件沖突問題