/** Updates bitmaps for page meshes. */
private void updatePages() {
Log.d("artbook", ">>>>>update page(s): " + Thread.currentThread());
if (mPageProvider == null || mPageBitmapWidth <= 0 || mPageBitmapHeight <= 0) {
return;
}
// Remove meshes from renderer.
mRenderer.removeCurlMesh(mPageLeft);
mRenderer.removeCurlMesh(mPageRight);
mRenderer.removeCurlMesh(mPageCurl);
int leftIdx = mCurrentIndex - 1;
int rightIdx = mCurrentIndex;
int curlIdx = -1;
if (mCurlState == CURL_LEFT) {
curlIdx = leftIdx;
--leftIdx;
} else if (mCurlState == CURL_RIGHT) {
curlIdx = rightIdx;
++rightIdx;
}
if (rightIdx >= 0 && rightIdx < mPageProvider.getPageCount()) {
updatePage(mPageRight.getTexturePage(), rightIdx);
mPageRight.setFlipTexture(false);
mPageRight.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
mPageRight.reset();
mRenderer.addCurlMesh(mPageRight);
}
if (leftIdx >= 0 && leftIdx < mPageProvider.getPageCount()) {
updatePage(mPageLeft.getTexturePage(), leftIdx);
mPageLeft.setFlipTexture(true);
mPageLeft.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_LEFT));
mPageLeft.reset();
if (mRenderLeftPage) {
mRenderer.addCurlMesh(mPageLeft);
}
}
if (curlIdx >= 0 && curlIdx < mPageProvider.getPageCount()) {
updatePage(mPageCurl.getTexturePage(), curlIdx);
if (mCurlState == CURL_RIGHT) {
mPageCurl.setFlipTexture(true);
mPageCurl.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
} else {
mPageCurl.setFlipTexture(false);
mPageCurl.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_LEFT));
}
mPageCurl.reset();
mRenderer.addCurlMesh(mPageCurl);
}
}
/**
* Set current page index. Page indices are zero based values presenting page being shown on right
* side of the book. E.g if you set value to 4; right side front facing bitmap will be with index
* 4, back facing 5 and for left side page index 3 is front facing, and index 2 back facing (once
* page is on left side it's flipped over).
*
* <p>Current index is rounded to closest value divisible with 2.
*/
public void setCurrentIndex(int index) {
Log.d("artbook", ">>>>>set current index " + Thread.currentThread());
if (mPageProvider == null || index < 0) {
mCurrentIndex = 0;
} else {
if (mAllowLastPageCurl) {
mCurrentIndex = Math.min(index, mPageProvider.getPageCount());
} else {
mCurrentIndex = Math.min(index, mPageProvider.getPageCount() - 1);
}
}
updatePages();
requestRender();
}
/** Updates given CurlPage via PageProvider for page located at index. */
private void updatePage(CurlPage page, int index) {
Log.d("artbook", ">>>>>update page: " + Thread.currentThread());
// First reset page to initial state.
page.reset();
// Ask page provider to fill it up with bitmaps and colors.
mPageProvider.updatePage(page, mPageBitmapWidth, mPageBitmapHeight, index);
}
/** Switches meshes and loads new bitmaps if available. Updated to support 2 pages in landscape */
private void startCurl(int page) {
switch (page) {
// Once right side page is curled, first right page is assigned into
// curled page. And if there are more bitmaps available new bitmap is
// loaded into right side mesh.
case CURL_RIGHT:
{
// Remove meshes from renderer.
mRenderer.removeCurlMesh(mPageLeft);
mRenderer.removeCurlMesh(mPageRight);
mRenderer.removeCurlMesh(mPageCurl);
// We are curling right page.
CurlMesh curl = mPageRight;
mPageRight = mPageCurl;
mPageCurl = curl;
if (mCurrentIndex > 0) {
mPageLeft.setFlipTexture(true);
mPageLeft.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_LEFT));
mPageLeft.reset();
if (mRenderLeftPage) {
mRenderer.addCurlMesh(mPageLeft);
}
}
if (mCurrentIndex < mPageProvider.getPageCount() - 1) {
updatePage(mPageRight.getTexturePage(), mCurrentIndex + 1);
mPageRight.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
mPageRight.setFlipTexture(false);
mPageRight.reset();
mRenderer.addCurlMesh(mPageRight);
}
// Add curled page to renderer.
mPageCurl.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
mPageCurl.setFlipTexture(false);
mPageCurl.reset();
mRenderer.addCurlMesh(mPageCurl);
mCurlState = CURL_RIGHT;
break;
}
// On left side curl, left page is assigned to curled page. And if
// there are more bitmaps available before currentIndex, new bitmap
// is loaded into left page.
case CURL_LEFT:
{
// Remove meshes from renderer.
mRenderer.removeCurlMesh(mPageLeft);
mRenderer.removeCurlMesh(mPageRight);
mRenderer.removeCurlMesh(mPageCurl);
// We are curling left page.
CurlMesh curl = mPageLeft;
mPageLeft = mPageCurl;
mPageCurl = curl;
if (mCurrentIndex > 1) {
updatePage(mPageLeft.getTexturePage(), mCurrentIndex - 2);
mPageLeft.setFlipTexture(true);
mPageLeft.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_LEFT));
mPageLeft.reset();
if (mRenderLeftPage) {
mRenderer.addCurlMesh(mPageLeft);
}
}
// If there is something to show on right page add it to renderer.
if (mCurrentIndex < mPageProvider.getPageCount()) {
mPageRight.setFlipTexture(false);
mPageRight.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
mPageRight.reset();
mRenderer.addCurlMesh(mPageRight);
}
// How dragging previous page happens depends on view mode.
if (mViewMode == SHOW_ONE_PAGE
|| (mCurlState == CURL_LEFT && mViewMode == SHOW_TWO_PAGES)) {
mPageCurl.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
mPageCurl.setFlipTexture(false);
} else {
mPageCurl.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_LEFT));
mPageCurl.setFlipTexture(true);
}
mPageCurl.reset();
mRenderer.addCurlMesh(mPageCurl);
mCurlState = CURL_LEFT;
break;
}
}
}
@Override
public boolean onTouch(View view, MotionEvent me) {
// No dragging during animation at the moment.
// TODO: Stop animation on touch event and return to drag mode.
if (mAnimate || mPageProvider == null) {
return false;
}
// We need page rects quite extensively so get them for later use.
RectF rightRect = mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT);
RectF leftRect = mRenderer.getPageRect(CurlRenderer.PAGE_LEFT);
// Store pointer position.
mPointerPos.mPos.set(me.getX(), me.getY());
mRenderer.translate(mPointerPos.mPos);
if (mEnableTouchPressure) {
mPointerPos.mPressure = me.getPressure();
} else {
mPointerPos.mPressure = 0.8f;
}
switch (me.getAction()) {
case MotionEvent.ACTION_DOWN:
{
// Once we receive pointer down event its position is mapped to
// right or left edge of page and that'll be the position from where
// user is holding the paper to make curl happen.
mDragStartPos.set(mPointerPos.mPos);
// First we make sure it's not over or below page. Pages are
// supposed to be same height so it really doesn't matter do we use
// left or right one.
if (mDragStartPos.y > rightRect.top) {
mDragStartPos.y = rightRect.top;
} else if (mDragStartPos.y < rightRect.bottom) {
mDragStartPos.y = rightRect.bottom;
}
// Then we have to make decisions for the user whether curl is going
// to happen from left or right, and on which page.
if (mViewMode == SHOW_TWO_PAGES) {
// If we have an open book and pointer is on the left from right
// page we'll mark drag position to left edge of left page.
// Additionally checking mCurrentIndex is higher than zero tells
// us there is a visible page at all.
if (mDragStartPos.x < rightRect.left && mCurrentIndex > 0) {
mDragStartPos.x = leftRect.left;
startCurl(CURL_LEFT);
}
// Otherwise check pointer is on right page's side.
else if (mDragStartPos.x >= rightRect.left
&& mCurrentIndex < mPageProvider.getPageCount()) {
mDragStartPos.x = rightRect.right;
if (!mAllowLastPageCurl && mCurrentIndex >= mPageProvider.getPageCount() - 1) {
return false;
}
startCurl(CURL_RIGHT);
}
} else if (mViewMode == SHOW_ONE_PAGE) {
float halfX = (rightRect.right + rightRect.left) / 2;
if (mDragStartPos.x < halfX && mCurrentIndex > 0) {
mDragStartPos.x = rightRect.left;
startCurl(CURL_LEFT);
} else if (mDragStartPos.x >= halfX && mCurrentIndex < mPageProvider.getPageCount()) {
mDragStartPos.x = rightRect.right;
if (!mAllowLastPageCurl && mCurrentIndex >= mPageProvider.getPageCount() - 1) {
return false;
}
startCurl(CURL_RIGHT);
}
}
// If we have are in curl state, let this case clause flow through
// to next one. We have pointer position and drag position defined
// and this will create first render request given these points.
if (mCurlState == CURL_NONE) {
return false;
}
}
case MotionEvent.ACTION_MOVE:
{
updateCurlPos(mPointerPos);
break;
}
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
{
if (mCurlState == CURL_LEFT || mCurlState == CURL_RIGHT) {
// Animation source is the point from where animation starts.
// Also it's handled in a way we actually simulate touch events
// meaning the output is exactly the same as if user drags the
// page to other side. While not producing the best looking
// result (which is easier done by altering curl position and/or
// direction directly), this is done in a hope it made code a
// bit more readable and easier to maintain.
mAnimationSource.set(mPointerPos.mPos);
mAnimationStartTime = System.currentTimeMillis();
// Given the explanation, here we decide whether to simulate
// drag to left or right end.
if ((mViewMode == SHOW_ONE_PAGE
&& mPointerPos.mPos.x > (rightRect.left + rightRect.right) / 2)
|| mViewMode == SHOW_TWO_PAGES && mPointerPos.mPos.x > rightRect.left) {
// On right side target is always right page's right border.
mAnimationTarget.set(mDragStartPos);
mAnimationTarget.x = mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT).right;
mAnimationTargetEvent = SET_CURL_TO_RIGHT;
} else {
// On left side target depends on visible pages.
mAnimationTarget.set(mDragStartPos);
if (mCurlState == CURL_RIGHT || mViewMode == SHOW_TWO_PAGES) {
mAnimationTarget.x = leftRect.left;
} else {
mAnimationTarget.x = rightRect.left;
}
mAnimationTargetEvent = SET_CURL_TO_LEFT;
}
mAnimate = true;
requestRender();
}
break;
}
}
return true;
}
