菜单滑动效果的实现代码,Java代码库,德仔网

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【Java】菜单滑动效果的实现
作者:OGEngine / 发布于2014/8/4/ 736

	public class MenuScrollerActivity extends BaseGameActivity implements IScrollDetectorListener, IOnSceneTouchListener, IClickDetectorListener {
	
	 // ===========================================================
	 // Constants
	 // ===========================================================
	 protected static int CAMERA_WIDTH = 480;
	 protected static int CAMERA_HEIGHT = 320;
	
	 protected static int FONT_SIZE = 24;
	 protected static int PADDING = 50;
	
	 protected static int MENUITEMS = 7;
	
	
	 // ===========================================================
	 // Fields
	 // ===========================================================
	 private Scene mScene;
	 private Camera mCamera;
	
	 private Font mFont;
	 private BitmapTextureAtlas mFontTexture;
	
	 private BitmapTextureAtlas mMenuTextureAtlas;
	 private TextureRegion mMenuLeftTextureRegion;
	 private TextureRegion mMenuRightTextureRegion;
	
	 private Sprite menuleft;
	 private Sprite menuright;
	
	 // Scrolling
	 private SurfaceScrollDetector mScrollDetector;
	 private ClickDetector mClickDetector;
	
	 private float mMinX = 0;
	 private float mMaxX = 0;
	 private float mCurrentX = 0;
	 private int iItemClicked = -1;
	
	 private Rectangle scrollBar;
	 private List<TextureRegion> columns = new ArrayList<TextureRegion>();
	
	 // ===========================================================
	 // Constructors
	 // ===========================================================
	
	 // ===========================================================
	 // Getter & Setter
	 // ===========================================================
	
	 // ===========================================================
	 // Methods for/from SuperClass/Interfaces
	 // ===========================================================
	
	 @Override
	 public void onLoadResources() {
	 // Paths
	 FontFactory.setAssetBasePath("font/");
	 BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
	
	 // Font
	 this.mFontTexture = new BitmapTextureAtlas(256, 256);
	 this.mFont = FontFactory.createFromAsset(this.mFontTexture, this, "Plok.TTF", FONT_SIZE, true, Color.BLACK);
	 this.mEngine.getTextureManager().loadTextures(this.mFontTexture);
	 this.mEngine.getFontManager().loadFonts(this.mFont);
	
	 //Images for the menu
	 for (int i = 0; i < MENUITEMS; i++) {
	 BitmapTextureAtlas mMenuBitmapTextureAtlas = new BitmapTextureAtlas(256,256, TextureOptions.BILINEAR_PREMULTIPLYALPHA);
	 TextureRegion mMenuTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(mMenuBitmapTextureAtlas, this, "menu"+i+".png", 0, 0);
	
	 this.mEngine.getTextureManager().loadTexture(mMenuBitmapTextureAtlas);
	 columns.add(mMenuTextureRegion);
	
	
	 }
	 //Textures for menu arrows
	 this.mMenuTextureAtlas = new BitmapTextureAtlas(128,128, TextureOptions.BILINEAR_PREMULTIPLYALPHA);
	 this.mMenuLeftTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(mMenuTextureAtlas, this, "menu_left.png", 0, 0);
	 this.mMenuRightTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(mMenuTextureAtlas, this, "menu_right.png",64, 0);
	 this.mEngine.getTextureManager().loadTexture(mMenuTextureAtlas);
	
	 }
	
	 @Override
	 public Engine onLoadEngine() {
	 this.mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);
	
	 final EngineOptions engineOptions = new EngineOptions(true, ScreenOrientation.LANDSCAPE, new FillResolutionPolicy(), this.mCamera);
	 engineOptions.getTouchOptions().setRunOnUpdateThread(true);
	
	 final Engine engine = new Engine(engineOptions);
	 return engine;
	 }
	
	 @Override
	 public Scene onLoadScene() {
	 this.mEngine.registerUpdateHandler(new FPSLogger());
	
	 this.mScene = new Scene();
	 this.mScene.setBackground(new ColorBackground(0, 0, 0));
	
	 this.mScrollDetector = new SurfaceScrollDetector(this);
	 this.mClickDetector = new ClickDetector(this);
	
	 this.mScene.setOnSceneTouchListener(this);
	 this.mScene.setTouchAreaBindingEnabled(true);
	 this.mScene.setOnSceneTouchListenerBindingEnabled(true);
	
	 CreateMenuBoxes();
	
	 return this.mScene;
	
	 }
	
	 @Override
	 public boolean onSceneTouchEvent(final Scene pScene, final TouchEvent pSceneTouchEvent) {
	 this.mClickDetector.onTouchEvent(pSceneTouchEvent);
	 this.mScrollDetector.onTouchEvent(pSceneTouchEvent);
	 return true;
	 }
	
	 @Override
	 public void onScroll(final ScrollDetector pScollDetector, final TouchEvent pTouchEvent, final float pDistanceX, final float pDistanceY) {
	
	 //Disable the menu arrows left and right (15px padding)
	 if(mCamera.getMinX()<=15)
	 menuleft.setVisible(false);
	 else
	 menuleft.setVisible(true);
	
	 if(mCamera.getMinX()>mMaxX-15)
	 menuright.setVisible(false);
	 else
	 menuright.setVisible(true);
	
	 //Return if ends are reached
	 if ( ((mCurrentX - pDistanceX) < mMinX) ){
	 return;
	 }else if((mCurrentX - pDistanceX) > mMaxX){
	
	 return;
	 }
	
	 //Center camera to the current point
	 this.mCamera.offsetCenter(-pDistanceX,0 );
	 mCurrentX -= pDistanceX;
	
	
	 //Set the scrollbar with the camera
	 float tempX =mCamera.getCenterX()-CAMERA_WIDTH/2;
	 // add the % part to the position
	 tempX+= (tempX/(mMaxX+CAMERA_WIDTH))*CAMERA_WIDTH;
	 //set the position
	 scrollBar.setPosition(tempX, scrollBar.getY());
	
	 //set the arrows for left and right
	 menuright.setPosition(mCamera.getCenterX()+CAMERA_WIDTH/2-menuright.getWidth(),menuright.getY());
	 menuleft.setPosition(mCamera.getCenterX()-CAMERA_WIDTH/2,menuleft.getY());
	
	
	
	 //Because Camera can have negativ X values, so set to 0
	 if(this.mCamera.getMinX()<0){
	 this.mCamera.offsetCenter(0,0 );
	 mCurrentX=0;
	 }
	
	
	 }
	
	 @Override
	 public void onClick(ClickDetector pClickDetector, TouchEvent pTouchEvent) {
	 loadLevel(iItemClicked);
	 };
	
	 // ===========================================================
	 // Methods
	 // ===========================================================
	
	 private void CreateMenuBoxes() {
	
	 int spriteX = PADDING;
	 int spriteY = PADDING;
	
	 //current item counter
	 int iItem = 1;
	
	 for (int x = 0; x < columns.size(); x++) {
	
	 //On Touch, save the clicked item in case it's a click and not a scroll.
	 final int itemToLoad = iItem;
	
	 Sprite sprite = new Sprite(spriteX,spriteY,columns.get(x)){
	
	 public boolean onAreaTouched(final TouchEvent pSceneTouchEvent, final float pTouchAreaLocalX, final float pTouchAreaLocalY) {
	 iItemClicked = itemToLoad;
	 return false;
	 }
	 };
	 iItem++;
	
	
	 this.mScene.attachChild(sprite);
	 this.mScene.registerTouchArea(sprite);
	
	 spriteX += 20 + PADDING+sprite.getWidth();
	 }
	
	 mMaxX = spriteX - CAMERA_WIDTH;
	
	 //set the size of the scrollbar
	 float scrollbarsize = CAMERA_WIDTH/((mMaxX+CAMERA_WIDTH)/CAMERA_WIDTH);
	 scrollBar = new Rectangle(0,CAMERA_HEIGHT-20,scrollbarsize, 20);
	 scrollBar.setColor(1,0,0);
	 this.mScene.attachChild(scrollBar);
	
	 menuleft = new Sprite(0,CAMERA_HEIGHT/2-mMenuLeftTextureRegion.getHeight()/2,mMenuLeftTextureRegion);
	 menuright = new Sprite(CAMERA_WIDTH-mMenuRightTextureRegion.getWidth(),CAMERA_HEIGHT/2-mMenuRightTextureRegion.getHeight()/2,mMenuRightTextureRegion);
	 this.mScene.attachChild(menuright);
	 menuleft.setVisible(false);
	 this.mScene.attachChild(menuleft);
	 }
	
	
	
	 @Override
	 public void onLoadComplete() {
	
	 }
	
	 //Here is where you call the item load.
	 private void loadLevel(final int iLevel) {
	 if (iLevel != -1) {
	 runOnUiThread(new Runnable() {
	 @Override
	 public void run() {
	
	 Toast.makeText(MenuScrollerActivity.this, "Load Item" + String.valueOf(iLevel), Toast.LENGTH_SHORT).show();
	 iItemClicked = -1;
	 }
	 });
	 }
	 }
	}
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　菜单滑动效果　　菜单滑动　　滑动菜单　
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