protected void dispatchDraw(Canvas canvas) {
Log.d(LOG_TAG, "dispatchDraw");
super.dispatchDraw(canvas);
if (!hasInit) {
hasInit = true;
indexPage = 0;
if (mPageAdapter == null) {
throw new RuntimeException("please set the PageAdapter on init");
}
totalPageNum = mPageAdapter.getCount();
mainLayout = new LinearLayout(mContext);
mainLayout.setLayoutParams(new LayoutParams(contentWidth, contentHeight));
mainLayout.setBackgroundColor(0xffffffff);
mState = BookState.READY;
invisibleLayout = new LinearLayout(mContext);
invisibleLayout.setLayoutParams(new LayoutParams(contentWidth, contentHeight));
this.addView(invisibleLayout);
this.addView(mainLayout);
mBookView = new BookView(mContext);
mBookView.setLayoutParams(new LayoutParams(contentWidth, contentHeight));
this.addView(mBookView);
updatePageView();
invalidate();
} else if (mState == BookState.READY) {
mBookView.update();
}
}
/** 此方法做过修改，改成一页显示 */
public void updatePageView() {
Log.d(LOG_TAG, "updatePageView");
if (indexPage < 0 || indexPage > totalPageNum - 1) {
return;
}
invisibleLayout.removeAllViews();
mainLayout.removeAllViews();
/* 当前页 */
currentPage = mPageAdapter.getView(indexPage);
if (currentPage == null) {
currentPage = new WhiteView(mContext);
}
currentPage.setLayoutParams(new LayoutParams(contentWidth, contentHeight));
mainLayout.addView(currentPage);
/* 背景页 */
middlePage = new WhiteView(mContext);
middlePage.setLayoutParams(new LayoutParams(contentWidth, contentHeight));
invisibleLayout.addView(middlePage);
/* 前一页 */
prevPage = null;
if (indexPage > 0) {
prevPage = mPageAdapter.getView(indexPage - 1);
}
if (prevPage == null) {
prevPage = new WhiteView(mContext);
}
prevPage.setLayoutParams(new LayoutParams(contentWidth, contentHeight));
invisibleLayout.addView(prevPage);
/* 后一页 */
nextPage = null;
if (indexPage < totalPageNum - 1) {
nextPage = mPageAdapter.getView(indexPage + 1);
}
if (nextPage == null) {
nextPage = new WhiteView(mContext);
}
nextPage.setLayoutParams(new LayoutParams(contentWidth, contentHeight));
invisibleLayout.addView(nextPage);
Log.d(LOG_TAG, "updatePageView finish");
}