更新表中的映像

Question

我目前正在创建一个清单系统，用户可以在其中从其清单列表集合中选择一个项目，右侧的图标将更新。

截至目前，我已经实现了一个 ClickListener 来从清单列表中获取当前选定的项，并调用了我创建的 .getImage（） 方法来获取选定项的图标。

我用了 table.add（image）;将图标添加到表格中。但是，当图标添加到表中时，它将填满该空间，并且当用户选择另一个项目时，将在右侧创建另一列。这就是问题所在。

如何让图像区域在用户选择另一个项目时更新，而不是在右侧创建另一列？

目前的情况是这样的：https://imgur.com/a/O6SW8gi

我希望使用用户单击的最新项目更新剑的区域。

这是我的代码：

package com.sps.game.inventory;

import com.badlogic.gdx.Gdx;

import com.badlogic.gdx.Input;

import com.badlogic.gdx.InputProcessor;

import com.badlogic.gdx.graphics.OrthographicCamera;

import com.badlogic.gdx.graphics.g2d.SpriteBatch;

import com.badlogic.gdx.scenes.scene2d.*;

import com.badlogic.gdx.scenes.scene2d.ui.*;

import com.badlogic.gdx.scenes.scene2d.utils.ClickListener;

import com.badlogic.gdx.utils.viewport.FitViewport;

import com.badlogic.gdx.utils.viewport.Viewport;

import com.sps.game.controller.InventoryController;

import com.sps.game.controller.PlayerController;

import java.util.ArrayList;

public class PlayerInventory {

    public Stage stage;

    public SpriteBatch sb;

    private Viewport viewport;

    private Skin skin = new Skin(Gdx.files.internal("core/assets/pixthulhuui/pixthulhu-ui.json"));

    private List<Item> inventory;

    private List<Image> itemImages;

    private InventoryController inventoryController;

    private InputProcessor oldInput;

    Table table = new Table(skin);

    public PlayerInventory(SpriteBatch sb, PlayerController playerController) {

        this.sb = sb;

        viewport = new FitViewport(Gdx.graphics.getWidth(), Gdx.graphics.getHeight(), new OrthographicCamera());

        stage = new Stage(viewport, sb);

        inventoryController = new InventoryController();

        inventory = inventoryController.getInventoryList();

       // itemImages = inventoryController.getImageList();

    }

Answer 1

解决。您不应该在每次单击屏幕时使用 table.add（单击图像）。add（） 创建一个新单元格。相反，请在初始布局期间仅添加一次占位符图像，并保留对它的引用。在我的ClickListener中，我使用clickedImage.setDrawable（）来更改显示的图像。

Answer 2

我发现了问题，查看LibGDX Wiki表 - 添加单元格，似乎您正在使用的方法不会替换单元格中的上一个actor，它只会在行中添加另一个actor。相反，您应该将显示的图像保存在add()Listpublic class PlayerInventory {&nbsp; &nbsp; [..........................]&nbsp; &nbsp; Item clickedItem; // This will save your clicked item&nbsp; &nbsp; Image clickedImage; // This will save your clicked image;&nbsp; &nbsp; [..........................]&nbsp; &nbsp; inventory.addListener(new ClickListener() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;public void clicked(InputEvent event, float x, float y) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (clickedItem == null && clickedImage == null) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; clickedItem = inventory.getSelected(); // This line changed&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; clickedImage = clickedItem.getImage(); // This line changed&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; table.add(clickedImage);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } else {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; clickedItem = inventory.getSelected(); // This line changed&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; clickedImage = clickedItem.getImage(); // This line changed&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; System.out.println(clickedItem.getName());&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }}如果之前没有图像，这将添加图像，如果以前有图像，则替换图像。希望这有帮助！