package com.poqop.document;
import java.util.HashMap;
import java.util.Map;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.PointF;
import android.graphics.RectF;
import android.util.FloatMath;
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;
/**
* 屏幕滚动
* 处理用户翻页操作，比如滑动、点击上下左右键等。
* 此时根据具体的用户操作计算需要显示哪几页，通知BaseViewerActivity去显示这些页
* @author Administrator
*
*/
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;
private static final int MAX_VALUE = 3800;
private static final float MULTIPLIER = 400.0f;
static final int NONE = 0; //空闲
static final int DRAG = 1; //拖动
static final int ZOOM = 2; //缩放
int mode = NONE;
private float oldDist;
private PointF midPoint = new PointF();
private boolean isZoom = false;
private boolean dblclick = true;
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);
}
public void setDecodeService(DecodeService decodeService) {
this.decodeService = decodeService;
}
private void init() {
if (isInitialized) {
return;
}
final int width = decodeService.getEffectivePagesWidth(); //获取试图的宽
final int height = decodeService.getEffectivePagesHeight(); //高
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());
}
/*
* 让视图更新
*/
@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;
}
/**
* 缩放功能的处理
*/
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();
}
/**
* 触摸屏事件
*/
@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(); //用obtain()函数来获得类的实例，开始计算速度
}
velocityTracker.addMovement(ev); //这个方法是将motion event 添加到velocityTracker
switch (ev.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
mode = DRAG;
/*
* 双击放大
* 用第一次点击和第二次点击的时间差来判断是否为双击
*/
if ((ev.getEventTime() - lastDownEventTime < DOUBLE_TAP_TIME) && dblclick) {
setCurrentValue(getmagnifyCurrentValues() - (ev.getX() - lastX));
dblclick=false;
mode = DRAG;
/*
* 双击缩小
*/
}else if((ev.getEventTime() - lastDownEventTime < DOUBLE_TAP_TIME) && !dblclick) {
setCurrentValue(getReduceCurrentValues() - (ev.getX() - lastX));
dblclick=true;
}else{
if (!scroller.isFinished()) {
scroller.abortAnimation();
zoomModel.commit();
}
else {
lastDownEventTime = ev.getEventTime();
}
}
stopScroller();
setLastPosition(ev);
/**
* velocityTracker 用来追踪触摸事件（flinging事件和其他手势事件）的速率
* fling(int startX, int startY, int velocityX, int velocityY, int minX, int maxX, int minY, int maxY)
* 方法进行控件滚动时各种位置坐标数值的计算
*/
case MotionEvent.ACTION_UP:
velocityTracker.computeCurrentVelocity(1000); // 初始化速率
scroller.fling(getScrollX(), getScrollY(), (int) -velocityTracker.getXVelocity(),
(int) -velocityTracker.getYVelocity(), getLeftLimit(), getRightLimit(), getTopLimit(), getBottomLimit());
velocityTracker.recycle(); //回收
velocityTracker = null;
mode = DRAG;
break;
/**
* API原文是 A non-primary pointer has gone down. 翻译过来就是：非第一个点按下
*/
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(ev);
midPoint(midPoint, ev);
isZoom = true;
mode = ZOOM;
break;
case MotionEvent.ACTION_POINTER_UP:
mode=DRAG;
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
scrollBy((int) (lastX - ev.getX()), (int) (lastY - ev.getY()));
setLastPosition(ev);
break;
} else if (mode==ZOOM) {
float newDist = spacing(ev);
/**
* 表示新的距离比两个手指刚触碰的距离大》》》放大 ( +10个像素用来延迟一下放大
*/
if (newDist > oldDist + 10) {
oldDist = spacing(ev);
setCurrentValue(getCurrentValue() - (ev.getX() - lastX));
lastX = ev.getX();
}
/**
* 表示新的距离比两个手指刚触碰的距离小:>>>>缩小
*/
if (newDist + 20 < oldDist) {
oldDist = spacing(ev);
setCurrentValue(getRedCurrentValues()
- (ev.getX() - lastX));
lastX = ev.getX();
}
break;
}
应用源码之DocumentViewer(PDF阅读器.zip （331个子文件） 
all-wcprops 2KB all-wcprops 2KB all-wcprops 1KB all-wcprops 1KB all-wcprops 1KB all-wcprops 612B all-wcprops 560B all-wcprops 560B all-wcprops 545B all-wcprops 532B all-wcprops 532B all-wcprops 528B all-wcprops 528B all-wcprops 428B all-wcprops 428B all-wcprops 424B all-wcprops 424B all-wcprops 401B all-wcprops 401B all-wcprops 393B all-wcprops 393B all-wcprops 252B all-wcprops 252B all-wcprops 210B all-wcprops 210B all-wcprops 210B all-wcprops 202B all-wcprops 85B all-wcprops 83B all-wcprops 82B all-wcprops 82B all-wcprops 82B resources.ap_ 65KB DocumentViewer.apk 1.36MB com.poqop.document.MainBrowserActivity.apk 1.36MB jarlist.cache 119B proguard.cfg 1KB DocumentView.class 12KB DecodeServiceBase.class 10KB BaseViewerActivity.class 9KB PageTreeNode.class 8KB BaseBrowserActivity.class 5KB Page.class 4KB ViewerPreferences.class 3KB BrowserAdapter.class 3KB PdfPage.class 3KB GoToPageDialog.class 3KB ZoomRoll.class 2KB UriBrowserAdapter.class 2KB DecodeServiceBase$DecodeTask.class 2KB MainBrowserActivity.class 2KB ZoomModel.class 2KB PageTreeNode$1$1.class 2KB DecodeServiceBase$2.class 2KB PageViewZoomControls.class 2KB SafeEvent.class 2KB BaseViewerActivity$1.class 2KB BaseBrowserActivity$1.class 2KB DecodeServiceBase$1.class 1KB MainBrowserActivity$1.class 1KB BaseBrowserActivity$4.class 1KB PdfDocument.class 1KB PathFromUri.class 1KB MD5StringUtil.class 1KB PageTreeNode$1.class 1KB BrowserAdapter$1.class 1KB EventDispatcher.class 1KB BaseViewerActivity$2.class 1KB MultiTouchZoomImpl.class 1KB DecodingProgressListener$DecodingProgressEvent.class 1KB PdfContext.class 1KB GoToPageDialog$2.class 1KB CurrentPageListener$CurrentPageChangedEvent.class 1014B DecodingProgressModel.class 957B BaseBrowserActivity$3.class 951B BaseBrowserActivity$2.class 947B BaseViewerActivity$3.class 935B ZoomChangedEvent.class 915B BringUpZoomControlsEvent.class 888B GoToPageDialog$1.class 878B DocumentView$1.class 876B ZoomListener$CommitZoomEvent.class 865B BaseViewerActivity$4.class 864B R$drawable.class 810B CurrentPageModel.class 777B DecodeService.class 726B DocumentView$3.class 683B DocumentView$2.class 664B PdfViewerActivity.class 616B VuDroidLibraryLoader.class 596B R$id.class 519B R.class 468B R$layout.class 465B R$string.class 400B DecodingProgressListener.class 329B BuildConfig.class 327B CodecPage.class 323B R$attr.class 313B CurrentPageListener.class 313B CodecContext.class 308B共 331 条
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