/** 实现歌词的滚动显示 */
public void scroll() {
Date startTime = new Date();
for (int i = 0; i < lrcAnalyst.getLrcTimeValAndIndex().size(); i++) {
while (true) {
try {
Thread.currentThread().sleep(50);
Date currentTime = new Date();
LrcTimeAndIndexNum fl = (LrcTimeAndIndexNum) (lrcAnalyst.getLrcTimeValAndIndex().get(i));
float diffTime = currentTime.getTime() - startTime.getTime();
lrcIndex = fl.getLrcIndex() - lrcAnalyst.getRealLrcStartOffset();
if (fl.getLrcTime() - (float) diffTime / 1000 < 0.0) {
scrollPoint.y--;
// System.out.println((String) lrcAnalyst.getLrcContent().get(
// fl.getLrcIndex()- lrcAnalyst.getRealLrcStartOffset()));
repaint();
break;
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
public void paintComponent(Graphics brush) {
// 用背景色覆盖，原来的文字就看不到了。再写上新的文字，由于视觉停留，
// 看起来文字就会滚动
brush.setColor(getBackground());
brush.fillRect(0, 0, getSize().width, getSize().height);
brush.setColor(Color.blue);
brush.setFont(fontOfChar);
// i为下标，用来历遍歌词缓存容器,
// 当scrollPoint.y+(heightOfChar*i)<0 时，会把文字写到面板上方，看不见。
// 没有必要显示。
// scrollPoint.y+(heightOfChar*i)=0 => i=(-scrollPoint.y/heightOfChar)
// 故要使(-scrollPoint.y/heightOfChar)和 0 作比较，要是小于0，i取0
/*int i = 0;
if ((-scrollPoint.y / heightOfChar) > 0)
{
i = (-scrollPoint.y / heightOfChar);
}*/
/*String lyrics = null;
for (; i < lrcAnalyst.getLrcContent().size(); i++)
{
// 当条件成立，文字会写到面板下方，也没有必要显示，跳出循环
if (scrollPoint.y + (heightOfChar * i) > getSize().height)
{
break;
}
lyrics = (String) (lrcAnalyst.getLrcContent().get(i));
// 见scroll(),靠scrollPoint.y的上移，使文字上移
brush.drawString(lyrics, scrollPoint.x, scrollPoint.y
+ (heightOfChar * i));
} */
String lyrics = (String) lrcAnalyst.getLrcContent().get(lrcIndex);
// 见scroll(),靠scrollPoint.y的上移，使文字上移
brush.drawString(lyrics, scrollPoint.x, -scrollPoint.y + 20);
}
public LrcScrollPane() {
lrcAnalyst = new LrcAnalystBase();
lrcAnalyst.readFile("六月的雨.lrc");
lrcAnalyst.parseLyrics();
scrollPoint = new Point(5, getSize().height);
}
