vudroid android pdf阅读器 源码

package com.poqop.document; import android.content.Context; import android.graphics.*; import android.view.KeyEvent; import android.view.MotionEvent; import android.view.VelocityTracker; import android.view.View; import android.widget.Scroller; import com.poqop.document.events.ZoomListener; import com.poqop.document.models.CurrentPageModel; import com.poqop.document.models.DecodingProgressModel; import com.poqop.document.models.ZoomModel; import com.poqop.document.multitouch.MultiTouchZoom; import com.poqop.document.multitouch.MultiTouchZoomImpl; import java.util.HashMap; import java.util.Map; public class DocumentView extends View implements ZoomListener { final ZoomModel zoomModel; private final CurrentPageModel currentPageModel; DecodeService decodeService; private final HashMap<Integer, Page> pages = new HashMap<Integer, Page>(); private boolean isInitialized = false; private int pageToGoTo; private float lastX; private float lastY; private VelocityTracker velocityTracker; private final Scroller scroller; DecodingProgressModel progressModel; private RectF viewRect; private boolean inZoom; private long lastDownEventTime; private static final int DOUBLE_TAP_TIME = 500; private MultiTouchZoom multiTouchZoom; public DocumentView(Context context, final ZoomModel zoomModel, DecodingProgressModel progressModel, CurrentPageModel currentPageModel) { super(context); this.zoomModel = zoomModel; this.progressModel = progressModel; this.currentPageModel = currentPageModel; setKeepScreenOn(true); scroller = new Scroller(getContext()); setFocusable(true); setFocusableInTouchMode(true); initMultiTouchZoomIfAvailable(zoomModel); } private void initMultiTouchZoomIfAvailable(ZoomModel zoomModel) { try { multiTouchZoom = (MultiTouchZoom) Class.forName("org.vudroid.core.multitouch.MultiTouchZoomImpl").getConstructor(ZoomModel.class).newInstance(zoomModel); } catch (Exception e) { System.out.println("Multi touch zoom is not available: " + e); } } public void setDecodeService(DecodeService decodeService) { this.decodeService = decodeService; } private void init() { if (isInitialized) { return; } final int width = decodeService.getEffectivePagesWidth(); final int height = decodeService.getEffectivePagesHeight(); for (int i = 0; i < decodeService.getPageCount(); i++) { pages.put(i, new Page(this, i)); pages.get(i).setAspectRatio(width, height); } isInitialized = true; invalidatePageSizes(); goToPageImpl(pageToGoTo); } private void goToPageImpl(final int toPage) { scrollTo(0, pages.get(toPage).getTop()); } @Override protected void onScrollChanged(int l, int t, int oldl, int oldt) { super.onScrollChanged(l, t, oldl, oldt); // bounds could be not updated post(new Runnable() { public void run() { currentPageModel.setCurrentPageIndex(getCurrentPage()); } }); if (inZoom) { return; } // on scrollChanged can be called from scrollTo just after new layout applied so we should wait for relayout post(new Runnable() { public void run() { updatePageVisibility(); } }); } private void updatePageVisibility() { for (Page page : pages.values()) { page.updateVisibility(); } } public void commitZoom() { for (Page page : pages.values()) { page.invalidate(); } inZoom = false; } public void showDocument() { // use post to ensure that document view has width and height before decoding begin post(new Runnable() { public void run() { init(); updatePageVisibility(); } }); } public void goToPage(int toPage) { if (isInitialized) { goToPageImpl(toPage); } else { pageToGoTo = toPage; } } public int getCurrentPage() { for (Map.Entry<Integer, Page> entry : pages.entrySet()) { if (entry.getValue().isVisible()) { return entry.getKey(); } } return 0; } public void zoomChanged(float newZoom, float oldZoom) { inZoom = true; stopScroller(); final float ratio = newZoom / oldZoom; invalidatePageSizes(); scrollTo((int) ((getScrollX() + getWidth() / 2) * ratio - getWidth() / 2), (int) ((getScrollY() + getHeight() / 2) * ratio - getHeight() / 2)); postInvalidate(); } @Override public boolean onTouchEvent(MotionEvent ev) { super.onTouchEvent(ev); if (multiTouchZoom != null) { if (multiTouchZoom.onTouchEvent(ev)) { return true; } if (multiTouchZoom.isResetLastPointAfterZoom()) { setLastPosition(ev); multiTouchZoom.setResetLastPointAfterZoom(false); } } if (velocityTracker == null) { velocityTracker = VelocityTracker.obtain(); } velocityTracker.addMovement(ev); switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: stopScroller(); setLastPosition(ev); if (ev.getEventTime() - lastDownEventTime < DOUBLE_TAP_TIME) { zoomModel.toggleZoomControls(); } else { lastDownEventTime = ev.getEventTime(); } break; case MotionEvent.ACTION_MOVE: scrollBy((int) (lastX - ev.getX()), (int) (lastY - ev.getY())); setLastPosition(ev); break; case MotionEvent.ACTION_UP: velocityTracker.computeCurrentVelocity(1000); scroller.fling(getScrollX(), getScrollY(), (int) -velocityTracker.getXVelocity(), (int) -velocityTracker.getYVelocity(), getLeftLimit(), getRightLimit(), getTopLimit(), getBottomLimit()); velocityTracker.recycle(); velocityTracker = null; break; } return true; } private void setLastPosition(MotionEvent ev) { lastX = ev.getX(); lastY = ev.getY(); } @Override public boolean dispatchKeyEvent(KeyEvent event) { if (event.getAction() == KeyEvent.ACTION_DOWN) { switch (event.getKeyCode()) { case KeyEvent.KEYCODE_DPAD_RIGHT: lineByLineMoveTo(1); return true; case KeyEvent.KEYCODE_DPAD_LEFT: lineByLineMoveTo(-1); return true; case KeyEvent.KEYCODE_DPAD_DOWN: verticalDpadScroll(1); return true; case KeyEvent.KEYCODE_DPAD_UP: verticalDpadScroll(-1); return true; } } return super.dispatchKeyEvent(event); } private void verticalDpadScroll(int direction) { scroller.startScroll(getScrollX(), getScrollY(), 0, direction * getHeight() / 2); invalidate(); } private void lineByLineMoveTo(int direction) { if (direction == 1 ? getScrollX() == getRightLimit() : getScrollX() == getLeftLimit()) { scroller.startScroll(getScrollX(), getScrollY(), direction * (getLeftLimit() - getRightLimit()), (int) (direction * pa