CurlView获取单击图像的位置

时间:2013-06-06 10:18:14

标签: android page-curl

我正在使用扩展GLSurfaceView的CurlView。我需要将这组位图传递给CurlView,并在页面卷曲视图中呈现它们。

我设置了默认设置,使图书以两页模式打开。 现在,当点击特定页面时,我需要以全屏模式显示它。 在CurlView上的CurlView am Setting onClickListner上有一个名为getCurrentPage的方法,并从这个方法获取当前页面,但问题是它返回显示在书的右侧的页面。 我需要在单击的页面上获取索引而不是右侧的索引。我知道我需要在CurlView上使用OnitemClickListner,但我不知道如何将它引入curlView,以便在实现时我将获得当前项目索引。

以下是我的尝试:

mCurlView.setOnClickListener(new OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        int pos = mCurlView.getCurrentIndex();  
                        Log.v("hello", "fdasfsdasdfasfafszsa"+pos);
                        Intent intent = new Intent(CurlActivity.this, GalleryActivity.class);
                        intent.putExtra("selectedIndex", pos);
                        intent.putExtra("wall", wall);
                        startActivity(intent);
                    }
                });

这是CurlView类:

public class CurlView extends GLSurfaceView implements View.OnTouchListener,
        CurlRenderer.Observer {

    // Curl state. We are flipping none, left or right page.
    public static final int CURL_LEFT = 1;
    private static final int CURL_NONE = 0;
    private static final int CURL_RIGHT = 2;

    // Constants for mAnimationTargetEvent.
    private static final int SET_CURL_TO_LEFT = 1;
    private static final int SET_CURL_TO_RIGHT = 2;

    // Shows one page at the center of view.
    public static final int SHOW_ONE_PAGE = 1;
    // Shows two pages side by side.
    public static final int SHOW_TWO_PAGES = 2;

    private boolean mAllowLastPageCurl = true;

    private boolean mAnimate = false;
    private long mAnimationDurationTime = 300;
    private PointF mAnimationSource = new PointF();
    private long mAnimationStartTime;
    private PointF mAnimationTarget = new PointF();
    private int mAnimationTargetEvent;

    private PointF mCurlDir = new PointF();

    private PointF mCurlPos = new PointF();
    static int mCurlState = CURL_NONE;
    // Current bitmap index. This is always showed as front of right page.
    private int mCurrentIndex = 0;

    // Start position for dragging.
    private PointF mDragStartPos = new PointF();

    private boolean mEnableTouchPressure = false;
    // Bitmap size. These are updated from renderer once it's initialized.
    private int mPageBitmapHeight = -1;

    private int mPageBitmapWidth = -1;
    // Page meshes. Left and right meshes are 'static' while curl is used to
    // show page flipping.
    private CurlMesh mPageCurl;

    private CurlMesh mPageLeft;
    private PageProvider mPageProvider;
    private CurlMesh mPageRight;

    private PointerPosition mPointerPos = new PointerPosition();

    private CurlRenderer mRenderer;
    private boolean mRenderLeftPage = true;
    private SizeChangedObserver mSizeChangedObserver;

    // One page is the default.
    private int mViewMode = SHOW_TWO_PAGES;

    /**
     * Default constructor.
     */
    public CurlView(Context ctx) {
        super(ctx);
        init(ctx);
    }

    /**
     * Default constructor.
     */
    public CurlView(Context ctx, AttributeSet attrs) {
        super(ctx, attrs);
        init(ctx);
    }

    /**
     * Default constructor.
     */
    public CurlView(Context ctx, AttributeSet attrs, int defStyle) {
        this(ctx, attrs);
    }

    /**
     * Get current page index. Page indices are zero based values presenting
     * page being shown on right side of the book.
     */
    public int getCurrentIndex() {
        return mCurrentIndex;
    }

    /**
     * Initialize method.
     */
    private void init(Context ctx) {
        mRenderer = new CurlRenderer(this);
        setRenderer(mRenderer);
        setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
        setOnTouchListener(this);

        // Even though left and right pages are static we have to allocate room
        // for curl on them too as we are switching meshes. Another way would be
        // to swap texture ids only.
        mPageLeft = new CurlMesh(10);
        mPageRight = new CurlMesh(10);
        mPageCurl = new CurlMesh(10);
        mPageLeft.setFlipTexture(true);
        mPageRight.setFlipTexture(false);
    }

    @Override
    public void onDrawFrame() {
        // We are not animating.
        if (mAnimate == false) {
            return;
        }

        long currentTime = System.currentTimeMillis();
        // If animation is done.
        if (currentTime >= mAnimationStartTime + mAnimationDurationTime) {
            if (mAnimationTargetEvent == SET_CURL_TO_RIGHT) {
                // Switch curled page to right.
                CurlMesh right = mPageCurl;
                CurlMesh curl = mPageRight;
                right.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
                right.setFlipTexture(false);
                right.reset();
                mRenderer.removeCurlMesh(curl);
                mPageCurl = curl;
                mPageRight = right;
                // If we were curling left page update current index.
                if (mCurlState == CURL_LEFT) {
                    --mCurrentIndex;
                }
            } else if (mAnimationTargetEvent == SET_CURL_TO_LEFT) {
                // Switch curled page to left.
                CurlMesh left = mPageCurl;
                CurlMesh curl = mPageLeft;
                left.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_LEFT));
                left.setFlipTexture(true);
                left.reset();
                mRenderer.removeCurlMesh(curl);
                if (!mRenderLeftPage) {
                    mRenderer.removeCurlMesh(left);
                }
                mPageCurl = curl;
                mPageLeft = left;
                // If we were curling right page update current index.
                if (mCurlState == CURL_RIGHT) {
                    ++mCurrentIndex;
                }
            }
            mCurlState = CURL_NONE;
            mAnimate = false;
            requestRender();
        } else {
            mPointerPos.mPos.set(mAnimationSource);
            float t = 1f - ((float) (currentTime - mAnimationStartTime) / mAnimationDurationTime);
            t = 1f - (t * t * t * (3 - 2 * t));
            mPointerPos.mPos.x += (mAnimationTarget.x - mAnimationSource.x) * t;
            mPointerPos.mPos.y += (mAnimationTarget.y - mAnimationSource.y) * t;
            updateCurlPos(mPointerPos);
        }
    }

    @Override
    public void onPageSizeChanged(int width, int height) {
        mPageBitmapWidth = width;
        mPageBitmapHeight = height;
        updatePages();
        requestRender();
    }

    @Override
    public void onSizeChanged(int w, int h, int ow, int oh) {
        super.onSizeChanged(w, h, ow, oh);
        requestRender();
        if (mSizeChangedObserver != null) {
            mSizeChangedObserver.onSizeChanged(w, h);
        }
    }

    @Override
    public void onSurfaceCreated() {
        // In case surface is recreated, let page meshes drop allocated texture
        // ids and ask for new ones. There's no need to set textures here as
        // onPageSizeChanged should be called later on.
        mPageLeft.resetTexture();
        mPageRight.resetTexture();
        mPageCurl.resetTexture();
    }

    @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 > 1) {
                    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 > 1) {
                    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;
    }

    /**
     * Allow the last page to curl.
     */
    public void setAllowLastPageCurl(boolean allowLastPageCurl) {
        mAllowLastPageCurl = allowLastPageCurl;
    }

    /**
     * Sets background color - or OpenGL clear color to be more precise. Color
     * is a 32bit value consisting of 0xAARRGGBB and is extracted using
     * android.graphics.Color eventually.
     */
    @Override
    public void setBackgroundColor(int color) {
        mRenderer.setBackgroundColor(color);
        requestRender();
    }

    /**
     * Sets mPageCurl curl position.
     */
    private void setCurlPos(PointF curlPos, PointF curlDir, double radius) {

        // First reposition curl so that page doesn't 'rip off' from book.
        if (mCurlState == CURL_RIGHT
                || (mCurlState == CURL_LEFT && mViewMode == SHOW_ONE_PAGE)) {
            RectF pageRect = mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT);
            if (curlPos.x >= pageRect.right) {
                mPageCurl.reset();
                requestRender();
                return;
            }
            if (curlPos.x < pageRect.left) {
                curlPos.x = pageRect.left;
            }
            if (curlDir.y != 0) {
                float diffX = curlPos.x - pageRect.left;
                float leftY = curlPos.y + (diffX * curlDir.x / curlDir.y);
                if (curlDir.y < 0 && leftY < pageRect.top) {
                    curlDir.x = curlPos.y - pageRect.top;
                    curlDir.y = pageRect.left - curlPos.x;
                } else if (curlDir.y > 0 && leftY > pageRect.bottom) {
                    curlDir.x = pageRect.bottom - curlPos.y;
                    curlDir.y = curlPos.x - pageRect.left;
                }
            }
        } else if (mCurlState == CURL_LEFT) {
            RectF pageRect = mRenderer.getPageRect(CurlRenderer.PAGE_LEFT);
            if (curlPos.x <= pageRect.left) {
                mPageCurl.reset();
                requestRender();
                return;
            }
            if (curlPos.x > pageRect.right) {
                curlPos.x = pageRect.right;
            }
            if (curlDir.y != 0) {
                float diffX = curlPos.x - pageRect.right;
                float rightY = curlPos.y + (diffX * curlDir.x / curlDir.y);
                if (curlDir.y < 0 && rightY < pageRect.top) {
                    curlDir.x = pageRect.top - curlPos.y;
                    curlDir.y = curlPos.x - pageRect.right;
                } else if (curlDir.y > 0 && rightY > pageRect.bottom) {
                    curlDir.x = curlPos.y - pageRect.bottom;
                    curlDir.y = pageRect.right - curlPos.x;
                }
            }
        }

        // Finally normalize direction vector and do rendering.
        double dist = Math.sqrt(curlDir.x * curlDir.x + curlDir.y * curlDir.y);
        if (dist != 0) {
            curlDir.x /= dist;
            curlDir.y /= dist;
            mPageCurl.curl(curlPos, curlDir, radius);
        } else {
            mPageCurl.reset();
        }

        requestRender();
    }

    /**
     * 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).
     * 
     * Current index is rounded to closest value divisible with 2.
     */
    public void setCurrentIndex(int index) {
        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();
    }

    /**
     * If set to true, touch event pressure information is used to adjust curl
     * radius. The more you press, the flatter the curl becomes. This is
     * somewhat experimental and results may vary significantly between devices.
     * On emulator pressure information seems to be flat 1.0f which is maximum
     * value and therefore not very much of use.
     */
    public void setEnableTouchPressure(boolean enableTouchPressure) {
        mEnableTouchPressure = enableTouchPressure;
    }

    /**
     * Set margins (or padding). Note: margins are proportional. Meaning a value
     * of .1f will produce a 10% margin.
     */
    public void setMargins(float left, float top, float right, float bottom) {
        mRenderer.setMargins(left, top, right, bottom);
    }

    /**
     * Update/set page provider.
     */
    public void setPageProvider(PageProvider pageProvider) {
        mPageProvider = pageProvider;
        mCurrentIndex = 0;
        updatePages();
        requestRender();
    }

    /**
     * Setter for whether left side page is rendered. This is useful mostly for
     * situations where right (main) page is aligned to left side of screen and
     * left page is not visible anyway.
     */
    public void setRenderLeftPage(boolean renderLeftPage) {
        mRenderLeftPage = renderLeftPage;
    }

    /**
     * Sets SizeChangedObserver for this View. Call back method is called from
     * this View's onSizeChanged method.
     */
    public void setSizeChangedObserver(SizeChangedObserver observer) {
        mSizeChangedObserver = observer;
    }

    /**
     * Sets view mode. Value can be either SHOW_ONE_PAGE or SHOW_TWO_PAGES. In
     * former case right page is made size of display, and in latter case two
     * pages are laid on visible area.
     */
    public void setViewMode(int viewMode) {
        switch (viewMode) {
        case SHOW_ONE_PAGE:
            mViewMode = viewMode;
            mPageLeft.setFlipTexture(true);
            mRenderer.setViewMode(CurlRenderer.SHOW_ONE_PAGE);
            break;
        case SHOW_TWO_PAGES:
            mViewMode = viewMode;
            mPageLeft.setFlipTexture(false);
            mRenderer.setViewMode(CurlRenderer.SHOW_TWO_PAGES);
            break;
        }
    }

    /**
     * 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;
        }

        }
    }

    /**
     * Updates curl position.
     */
    private void updateCurlPos(PointerPosition pointerPos) {

        // Default curl radius.
        double radius = mRenderer.getPageRect(CURL_RIGHT).width() / 3;
        // TODO: This is not an optimal solution. Based on feedback received so
        // far; pressure is not very accurate, it may be better not to map
        // coefficient to range [0f, 1f] but something like [.2f, 1f] instead.
        // Leaving it as is until get my hands on a real device. On emulator
        // this doesn't work anyway.
        radius *= Math.max(1f - pointerPos.mPressure, 0f);
        // NOTE: Here we set pointerPos to mCurlPos. It might be a bit confusing
        // later to see e.g "mCurlPos.x - mDragStartPos.x" used. But it's
        // actually pointerPos we are doing calculations against. Why? Simply to
        // optimize code a bit with the cost of making it unreadable. Otherwise
        // we had to this in both of the next if-else branches.
        mCurlPos.set(pointerPos.mPos);

        // If curl happens on right page, or on left page on two page mode,
        // we'll calculate curl position from pointerPos.
        if (mCurlState == CURL_RIGHT
                || (mCurlState == CURL_LEFT && mViewMode == SHOW_TWO_PAGES)) {

            mCurlDir.x = mCurlPos.x - mDragStartPos.x;
            mCurlDir.y = mCurlPos.y - mDragStartPos.y;
            float dist = (float) Math.sqrt(mCurlDir.x * mCurlDir.x + mCurlDir.y
                    * mCurlDir.y);

            // Adjust curl radius so that if page is dragged far enough on
            // opposite side, radius gets closer to zero.
            float pageWidth = mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT)
                    .width();
            double curlLen = radius * Math.PI;
            if (dist > (pageWidth * 2) - curlLen) {
                curlLen = Math.max((pageWidth * 2) - dist, 0f);
                radius = curlLen / Math.PI;
            }

            // Actual curl position calculation.
            if (dist >= curlLen) {
                double translate = (dist - curlLen) / 2;
                if (mViewMode == SHOW_TWO_PAGES) {
                    mCurlPos.x -= mCurlDir.x * translate / dist;
                } else {
                    float pageLeftX = mRenderer
                            .getPageRect(CurlRenderer.PAGE_RIGHT).left;
                    radius = Math.max(Math.min(mCurlPos.x - pageLeftX, radius),
                            0f);
                }
                mCurlPos.y -= mCurlDir.y * translate / dist;
            } else {
                double angle = Math.PI * Math.sqrt(dist / curlLen);
                double translate = radius * Math.sin(angle);
                mCurlPos.x += mCurlDir.x * translate / dist;
                mCurlPos.y += mCurlDir.y * translate / dist;
            }
        }
        // Otherwise we'll let curl follow pointer position.
        else if (mCurlState == CURL_LEFT) {

            // Adjust radius regarding how close to page edge we are.
            float pageLeftX = mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT).left;
            radius = Math.max(Math.min(mCurlPos.x - pageLeftX, radius), 0f);

            float pageRightX = mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT).right;
            mCurlPos.x -= Math.min(pageRightX - mCurlPos.x, radius);
            mCurlDir.x = mCurlPos.x + mDragStartPos.x;
            mCurlDir.y = mCurlPos.y - mDragStartPos.y;
        }

        setCurlPos(mCurlPos, mCurlDir, radius);
    }

    /**
     * Updates given CurlPage via PageProvider for page located at index.
     */
    private void updatePage(CurlPage page, int index) {
        // 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);
    }

    /**
     * Updates bitmaps for page meshes.
     */
    private void updatePages() {
        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);
        }
    }

    /**
     * Provider for feeding 'book' with bitmaps which are used for rendering
     * pages.
     */
    public interface PageProvider {

        /**
         * Return number of pages available.
         */
        public int getPageCount();

        /**
         * Called once new bitmaps/textures are needed. Width and height are in
         * pixels telling the size it will be drawn on screen and following them
         * ensures that aspect ratio remains. But it's possible to return bitmap
         * of any size though. You should use provided CurlPage for storing page
         * information for requested page number.<br/>
         * <br/>
         * Index is a number between 0 and getBitmapCount() - 1.
         */
        public void updatePage(CurlPage page, int width, int height, int index);
    }

    /**
     * Simple holder for pointer position.
     */
    private class PointerPosition {
        PointF mPos = new PointF();
        float mPressure;
    }

    /**
     * Observer interface for handling CurlView size changes.
     */
    public interface SizeChangedObserver {

        /**
         * Called once CurlView size changes.
         */
        public void onSizeChanged(int width, int height);
    }

}

0 个答案:

没有答案