详解Android Libgdx中ScrollPane和Actor事件冲突问题的解决办法

详解android libgdx中scrollpane和actor事件冲突问题的解决办法

在libgdx的使用过程中，经常会用到scrollpane这个widget，来实现滑动效果， 如下所示：

但是如果想在上面的效果上添加一点扩展，比如scrollpane中的actor可以从scrollpane中移出来，并添加到stage中，则需要添加额外的逻辑

具体代码参考如下：

/**
 * 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();
  }

}

实现效果如下：

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