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：
如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！
