image - 使用libgdx，如何将文本和图像同时添加到ScrollPane？

Question

这是一个代码片段。

itemList = new List(skin, "ariel.32.white");
String[] tmpInv = new String[b+1];
tmpInv[0] = "<Empty>";
a++;
for (Entry<String, String> entry : inventoryItems.entrySet()) {
    tmpInv[a] = entry.getKey(); 
    a++;
    //String key = entry.getKey();
    //Object value = entry.getValue();
    // ...
}
Arrays.sort(tmpInv);

itemList.setItems(tmpInv);

inventoryPane  = new ScrollPane(itemList, skin);

这是我得到的，并且工作正常。我想在每个项目的前面添加描述性图标，但似乎无法使其正常工作。添加它们之后，我还需要一些方法来获取所选内容的名称。目前我使用

itemlist.getSelectedIndex();

Answer 1

据我所知，您不能使用列表窗口小部件添加图像或表格或除文本以外的任何内容。但是，您可以制作表格并将背景Drawable更改为新的Texture，该纹理可以在发生某些事件(例如mouseMove事件)时模拟列表的效果。然后，您可以将该表添加到可以处理滚动事件的ScrollPane中。

这将需要一些编码，但是这是我为您准备的一个工作示例:

package <some package>;

import com.badlogic.gdx.Game;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.scenes.scene2d.Event;
import com.badlogic.gdx.scenes.scene2d.Stage;
import com.badlogic.gdx.scenes.scene2d.ui.Image;
import com.badlogic.gdx.scenes.scene2d.ui.Label;
import com.badlogic.gdx.scenes.scene2d.ui.ScrollPane;
import com.badlogic.gdx.scenes.scene2d.ui.Skin;
import com.badlogic.gdx.scenes.scene2d.ui.Table;
import com.badlogic.gdx.scenes.scene2d.utils.FocusListener;
import com.badlogic.gdx.scenes.scene2d.utils.TextureRegionDrawable;

public class ScrollScreenTest implements Screen{
    Game game;
    ScrollPane scrollpane;
    Skin skin;
    Stage stage;
    Table container, table1, table2, table3;
    Texture texture1, texture2, texture3;

    public ScrollScreenTest(Game game){
        this.game = game;
    }
    @Override
    public void render(float delta) {
        Gdx.gl.glClearColor(0, 0, 0, 1);    //sets up the clear color (background color) of the screen.
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);  //instructs openGL to actually clear the screen to the newly set clear color.
        stage.draw();
        stage.act(delta);

    }

    @Override
    public void resize(int width, int height) {
    }

    @Override
    public void show() {

        // setup skin
        skin = new Skin(Gdx.files.internal("data/uiskin.json"));

        texture1 = new Texture(Gdx.files.internal("iron_axe.png"));
        texture2 = new Texture(Gdx.files.internal("iron_dagger.png"));
        texture3 = new Texture(Gdx.files.internal("iron_sword.png"));

        // table that holds the scroll pane
        container = new Table();
        container.setWidth(320f);
        container.setHeight(300f);

        // tables that hold the data you want to display
        table1 = new Table(skin);
        table1.add(new Image(texture1)).expandY().fillY();
        table1.add(new Label("", skin)).width(10f).expandY().fillY();// a spacer
        table1.add(new Label("Look at this axe I stole!", skin)).expandY().fillY();

        table2 = new Table(skin);
        table2.add(new Image(texture2)).expandY().fillY();
        table2.add(new Label("", skin)).width(10f).expandY().fillY();// a spacer
        table2.add(new Label("So dagger, much pointy.", skin)).expandY().fillY();

        table3 = new Table(skin);
        table3.add(new Image(texture3)).expandY().fillY();
        table3.add(new Label("", skin)).width(10f).expandY().fillY();// a spacer
        table3.add(new Label("Valyrian steel..", skin)).expandY().fillY();


        //inner table that is used as a makeshift list.
        Table innerContainer = new Table();
        innerContainer.add(table1).expand().fill();
        innerContainer.row();
        innerContainer.add(table2).expand().fill();
        innerContainer.row();
        innerContainer.add(table3).expand().fill();

        // create the scrollpane
        scrollpane = new ScrollPane(innerContainer);

        //add the scroll pane to the container
        container.add(scrollpane).fill().expand();

        // setup stage
        stage = new Stage();

        // add container to the stage
        stage.addActor(container);

        // setup input processor (gets clicks and stuff)
        Gdx.input.setInputProcessor(stage);

        // setup a listener for the tables with out data

        table1.addListener(new FocusListener(){
            @Override
            public boolean handle(Event event){

            if (event.toString().equals("mouseMoved")){
                table1.background(new TextureRegionDrawable(new TextureRegion(new Texture("gray.png"))));
                return false;
            }
            else if(event.toString().equals("exit")){
                //table1.setBackground(null);
                //table1.background("");
                table1.setBackground(null, false);

                return false;
            }
                return true;
            }

        });
        table2.addListener(new FocusListener(){
            @Override
            public boolean handle(Event event){

            if (event.toString().equals("mouseMoved")){
                table2.background(new TextureRegionDrawable(new TextureRegion(new Texture("gray.png"))));
                return false;
            }
            else if(event.toString().equals("exit")){
                //table1.setBackground(null);
                //table1.background("");
                table2.setBackground(null, false);

                return false;
            }
                return true;
            }

        });
        table3.addListener(new FocusListener(){
            @Override
            public boolean handle(Event event){

            if (event.toString().equals("mouseMoved")){
                table3.background(new TextureRegionDrawable(new TextureRegion(new Texture("gray.png"))));
                return false;
            }
            else if(event.toString().equals("exit")){
                //table1.setBackground(null);
                //table1.background("");
                table3.setBackground(null, false);

                return false;
            }
                return true;
            }

        });
    }

    @Override
    public void hide() {
    }

    @Override
    public void pause() {
    }

    @Override
    public void resume() {
    }

    @Override
    public void dispose() {
    }

}