Libgdx学习笔记：可垂直滚动的文本组件CHScrollLabel
效果图：
使用范例：
CHScrollLabelStyle scrollLabelStyle = new CHScrollLabelStyle(); // 文本背景 scrollLabelStyle.background = Chao.game.getDrawable(CHRes.asset.zhao_png); // 右侧滚动条背景 scrollLabelStyle.vScroll = Chao.game.getDrawable(CHRes.asset.loading_bg_jpg); // 滚动条浮标 scrollLabelStyle.vScrollKnob = Chao.game.getDrawable(CHRes.asset.day_1_png); // 滚动条浮标高 scrollLabelStyle.scrollBarHeight=30; // 滚动条浮标宽 scrollLabelStyle.scrollBarWidth=10; CHScrollLabel scrollLabel = new CHScrollLabel(Color.RED, testText); // 设置宽，高 scrollLabel.setSize(400, 300); CHUIUtil.toCenter(scrollLabel); addActor(scrollLabel); // 绑定样式 scrollLabel.setScrollLabelStyle(scrollLabelStyle);
源码展示：
package com.oahcfly.chgame.core.ui;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.math.Rectangle;
import com.badlogic.gdx.scenes.scene2d.InputEvent;
import com.badlogic.gdx.scenes.scene2d.utils.ActorGestureListener;
import com.badlogic.gdx.scenes.scene2d.utils.Drawable;
import com.badlogic.gdx.utils.Align;
import com.oahcfly.chgame.core.freefont.FreeFont;
import com.oahcfly.chgame.core.freefont.FreeLabel;
import com.oahcfly.chgame.core.mvc.CHActor;
/**
*
*
* 可以滚动的文本
*
* @author haocao
*
*/
public class CHScrollLabel extends CHActor {
private FreeLabel freeLabel;
// 滚动偏移量，左下角为(0,0)
private float scrollY;
private CHScrollLabelStyle scrollLabelStyle;
public CHScrollLabel (CHScrollLabelStyle style, Color textColor, String text) {
this(style, FreeFont.DEFAULT_FONT_NAME, textColor, text);
}
public CHScrollLabel (Color textColor, String text) {
this(new CHScrollLabelStyle(), FreeFont.DEFAULT_FONT_NAME, textColor, text);
}
public CHScrollLabel (CHScrollLabelStyle style, String fontName, Color textColor, String text) {
this.scrollLabelStyle = style;
freeLabel = FreeFont.getLabel(textColor, text);
freeLabel.setWrap(true);
freeLabel.setAlignment(Align.topLeft);
setText(text);
setTextColor(textColor);
addListener(new ActorGestureListener() {
@Override
public void pan (InputEvent event, float x, float y, float deltaX, float deltaY) {
scrollY(deltaY);
}
@Override
public void touchUp (InputEvent event, float x, float y, int pointer, int button) {
}
});
}
public CHScrollLabelStyle getScrollLabelStyle () {
return scrollLabelStyle;
}
public void setScrollLabelStyle (CHScrollLabelStyle scrollLabelStyle) {
this.scrollLabelStyle = scrollLabelStyle;
}
@Override
public void drawAfterBg (Batch batch) {
//背景
if (scrollLabelStyle != null && scrollLabelStyle.background != null) {
scrollLabelStyle.background.draw(batch, getX(), getY(), getWidth(), getHeight());
}
// 设置裁剪区域
if (getClipRectangleArr().size == 0) {
addClipRectangle(new Rectangle(0, 0, getWidth(), getHeight()));
}
freeLabel.setPosition(getX(), getY() + scrollY);
freeLabel.setWidth(getWidth() - (scrollLabelStyle != null ? scrollLabelStyle.scrollBarWidth : 0));
freeLabel.setHeight(getHeight());
freeLabel.draw(batch, 1);
Color color = getColor();
batch.setColor(color.r, color.g, color.b, color.a * 0.8f);
if (scrollLabelStyle != null && scrollLabelStyle.vScroll != null) {
scrollLabelStyle.vScroll.draw(batch, getRight() - scrollLabelStyle.scrollBarWidth, getY(),
scrollLabelStyle.scrollBarWidth, getHeight());
}
if (scrollLabelStyle != null && scrollLabelStyle.vScrollKnob != null) {
// w=10,h=30,yRange=[gety~gettop-30]
float scrollH = getTop() - scrollLabelStyle.scrollBarHeight - getY();
float percent = scrollY / (freeLabel.getTextHeight() - getHeight());
scrollLabelStyle.vScrollKnob.draw(batch, getRight() - scrollLabelStyle.scrollBarWidth, getY() + scrollH * (1 - percent),
scrollLabelStyle.scrollBarWidth, scrollLabelStyle.scrollBarHeight);
}
}
public void setText (String text) {
freeLabel.setText(text);
}
public void setTextColor (Color textColor) {
freeLabel.setColor(textColor);
}
public void scrollY (float value) {
float temp = freeLabel.getTextHeight() - getHeight();
if (temp <= 0) {
return;
}
scrollY += value;
// 边界检测
if (scrollY > temp) {
scrollY = temp;
}
if (scrollY < 0) {
scrollY = 0;
}
}
public FreeLabel getLabel () {
return freeLabel;
}
/**
*
*
* 样式：背景，
* @author haocao
*
*/
static public class CHScrollLabelStyle {
/** Optional. */
public Drawable background;
/** Optional. */
public Drawable vScroll, vScrollKnob;
public float scrollBarWidth = 10, scrollBarHeight = 30;
public CHScrollLabelStyle () {
}
public CHScrollLabelStyle (Drawable background, Drawable vScroll, Drawable vScrollKnob) {
this.background = background;
this.vScroll = vScroll;
this.vScrollKnob = vScrollKnob;
}
public CHScrollLabelStyle (CHScrollLabelStyle style) {
this.background = style.background;
this.vScroll = style.vScroll;
this.vScrollKnob = style.vScrollKnob;
}
}
}
package com.oahcfly.chgame.core.mvc;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.TextureAtlas.AtlasRegion;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.math.Rectangle;
import com.badlogic.gdx.scenes.scene2d.Actor;
import com.badlogic.gdx.utils.Align;
import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.Pool;
import com.badlogic.gdx.utils.Pool.Poolable;
import com.badlogic.gdx.utils.Pools;
import com.oahcfly.chgame.core.Chao;
/** <pre>
* 二次封装的actor
*
* date: 2014-12-11
* </pre>
*
* @author caohao */
public class CHActor extends Actor implements Poolable {
private int tag;
private Texture bgTexture;
private TextureRegion bgTextureRegion;
private Sprite sprite;
public CHActor () {
}
/**
* 绑定一个精灵，此时CHActor的属性会同步到精灵上。
* @param sprite
*/
public void bindSprite (Sprite sprite) {
this.sprite = sprite;
setSize(this.sprite.getWidth(), this.sprite.getHeight());
setOrigin(Align.center);
}
@Override
public void draw (Batch batch, float parentAlpha) {
if (clipRectangleArr.size > 0) {
for (Rectangle cRectangle : clipRectangleArr) {
this.drawCore(batch, parentAlpha, cRectangle);
}
} else {
this.drawCore(batch, parentAlpha, null);
}
}
/**
* 核心绘制
* @param batch
* @param parentAlpha
* @param clipRectangle
*/
private void drawCore (Batch batch, float parentAlpha, Rectangle clipRectangle) {
boolean clipok = false;
// 开始裁剪
if (clipRectangle != null) {
batch.flush(); // 绘制之前添加的元素，如果不添加此处代码，后面的裁剪会导致之前的纹理也会被裁剪
clipok = clipBegin(getX() + clipRectangle.x, getY() + clipRectangle.y, clipRectangle.width, clipRectangle.height);
}
Color color = getColor();
batch.setColor(color.r, color.g, color.b, color.a);
float x = getX();
float y = getY();
float scaleX = getScaleX();
float scaleY = getScaleY();
float width = getWidth();
float height = getHeight();
if (bgTexture != null) {
batch.draw(bgTexture, x, y, getOriginX(), getOriginY(), getWidth(), getHeight(), scaleX, scaleY, getRotation(), 0, 0,
(int)width, (int)height, false, false);
}
if (bgTextureRegion != null) {
if (bgTextureRegion instanceof Sprite) {
Sprite sprite = (Sprite)bgTextureRegion;
sprite.setColor(batch.getColor());
sprite.setOrigin(getOriginX(), getOriginY());
sprite.setPosition(x, y);
sprite.setScale(scaleX, scaleY);
sprite.setSize(width, height);
sprite.setRotation(getRotation());
sprite.draw(batch);
} else {
batch.draw(bgTextureRegion, x, y, getOriginX(), getOriginY(), width, height, scaleX, scaleY, getRotation());
}
}
if (sprite != null) {
sprite.setColor(color);
sprite.setOrigin(getOriginX(), getOriginY());
sprite.setPosition(x, y);
sprite.setScale(scaleX, scaleY);
sprite.setSize(width, height);
sprite.setRotation(getRotation());
sprite.draw(batch);
}
// 绘制完背景后进行其他内容绘制
drawAfterBg(batch);
// 提交裁剪内容
if (clipok) {
batch.flush();
clipEnd();
}
}
public void drawAfterBg (Batch batch) {
};
public void setBgTexture (Texture bgTexture) {
this.bgTexture = bgTexture;
if (bgTexture != null) {
setSize(bgTexture.getWidth(), bgTexture.getHeight());
}
setOrigin(Align.center);
}
/** <pre>
* 使用缓存池
*
* date: 2015-1-3
* </pre>
*
* @author caohao
* @return */
@SuppressWarnings("unchecked")
public static <T extends CHActor> T obtain (Class<T> type) {
Pool<CHActor> pool = (Pool<CHActor>)Pools.get(type);
CHActor actor = pool.obtain();
actor.setBgTexture(null);
return (T)actor;
}
public static CHActor obtain () {
return obtain(CHActor.class);
}
@Override
public void reset () {
this.bgTexture = null;
this.bgTextureRegion = null;
clipRectangleArr.clear();
setScale(1);
setRotation(0);
clear();
setUserObject(null);
this.setColor(new Color(1, 1, 1, 1));
setStage(null);
setParent(null);
setVisible(true);
setName(null);
setOrigin(Align.center);
setPosition(0, 0);
}
public Texture getBgTexture () {
return bgTexture;
}
public TextureRegion getBgTextureRegion () {
return bgTextureRegion;
}
public void setBgTextureRegion (TextureRegion textureRegion) {
this.bgTextureRegion = textureRegion;
if (bgTextureRegion != null) {
if (bgTextureRegion instanceof Sprite) {
Sprite sprite = (Sprite)bgTextureRegion;
setSize(sprite.getWidth(), sprite.getHeight());
} else if (bgTextureRegion instanceof AtlasRegion) {
AtlasRegion atlasRegion = (AtlasRegion)bgTextureRegion;
bgTextureRegion = Chao.plistCenter.createSprite(atlasRegion);
Sprite sprite = (Sprite)bgTextureRegion;
setSize(sprite.getWidth(), sprite.getHeight());
} else {
setSize(bgTextureRegion.getRegionWidth(), bgTextureRegion.getRegionHeight());
}
}
setOrigin(Align.center);
}
@Override
public boolean remove () {
boolean remove = super.remove();
if (remove) {
Pools.free(this);
}
return remove;
}
public int getTag () {
return tag;
}
public void setTag (int tag) {
this.tag = tag;
}
private Array<Rectangle> clipRectangleArr = new Array<Rectangle>();
/**
* 添加裁剪矩形，范围为当前Actor的显示区域即：(0,0)~(w,h) 原点为左下角
* @param rectangle
*/
public void addClipRectangle (Rectangle rectangle) {
clipRectangleArr.add(rectangle);
}
public Array<Rectangle> getClipRectangleArr () {
return clipRectangleArr;
}
public Sprite getSprite () {
return sprite;
}
private Rectangle boundsRectangle;
@Override
protected void sizeChanged () {
if (boundsRectangle == null) {
boundsRectangle = new Rectangle();
}
boundsRectangle.width = getWidth();
boundsRectangle.height = getHeight();
}
/**
* 用于碰撞检测的矩形区域
* @return
*/
public Rectangle getBoundsRectangle () {
boundsRectangle.x = getX();
boundsRectangle.y = getY();
return boundsRectangle;
}
}
基于Libgdx开发的开源游戏框架CHGame：
http://git.oschina.net/oahcfly/CHGameFrame