summaryrefslogtreecommitdiff
path: root/android/src/com/artifex/mupdfdemo/PageView.java
diff options
context:
space:
mode:
Diffstat (limited to 'android/src/com/artifex/mupdfdemo/PageView.java')
-rw-r--r--android/src/com/artifex/mupdfdemo/PageView.java640
1 files changed, 640 insertions, 0 deletions
diff --git a/android/src/com/artifex/mupdfdemo/PageView.java b/android/src/com/artifex/mupdfdemo/PageView.java
new file mode 100644
index 00000000..064ce3f8
--- /dev/null
+++ b/android/src/com/artifex/mupdfdemo/PageView.java
@@ -0,0 +1,640 @@
+package com.artifex.mupdfdemo;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+
+import android.content.ClipData;
+import android.content.ClipboardManager;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Point;
+import android.graphics.PointF;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.os.Handler;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.ProgressBar;
+
+class PatchInfo {
+ public BitmapHolder bmh;
+ public Bitmap bm;
+ public Point patchViewSize;
+ public Rect patchArea;
+ public boolean completeRedraw;
+
+ public PatchInfo(Point aPatchViewSize, Rect aPatchArea, BitmapHolder aBmh, boolean aCompleteRedraw) {
+ bmh = aBmh;
+ bm = null;
+ patchViewSize = aPatchViewSize;
+ patchArea = aPatchArea;
+ completeRedraw = aCompleteRedraw;
+ }
+}
+
+// Make our ImageViews opaque to optimize redraw
+class OpaqueImageView extends ImageView {
+
+ public OpaqueImageView(Context context) {
+ super(context);
+ }
+
+ @Override
+ public boolean isOpaque() {
+ return true;
+ }
+}
+
+abstract class TextSelector {
+ final private TextWord[][] mText;
+ final private RectF mSelectBox;
+
+ public TextSelector(TextWord[][] text, RectF selectBox) {
+ mText = text;
+ mSelectBox = selectBox;
+ }
+
+ protected abstract void onStartLine();
+ protected abstract void onWord(TextWord word);
+ protected abstract void onEndLine();
+
+ public void select() {
+ if (mText == null || mSelectBox == null)
+ return;
+
+ ArrayList<TextWord[]> lines = new ArrayList<TextWord[]>();
+ for (TextWord[] line : mText)
+ if (line[0].bottom > mSelectBox.top && line[0].top < mSelectBox.bottom)
+ lines.add(line);
+
+ Iterator<TextWord[]> it = lines.iterator();
+ while (it.hasNext()) {
+ TextWord[] line = it.next();
+ boolean firstLine = line[0].top < mSelectBox.top;
+ boolean lastLine = line[0].bottom > mSelectBox.bottom;
+ float start = Float.NEGATIVE_INFINITY;
+ float end = Float.POSITIVE_INFINITY;
+
+ if (firstLine && lastLine) {
+ start = Math.min(mSelectBox.left, mSelectBox.right);
+ end = Math.max(mSelectBox.left, mSelectBox.right);
+ } else if (firstLine) {
+ start = mSelectBox.left;
+ } else if (lastLine) {
+ end = mSelectBox.right;
+ }
+
+ onStartLine();
+
+ for (TextWord word : line)
+ if (word.right > start && word.left < end)
+ onWord(word);
+
+ onEndLine();
+ }
+ }
+}
+
+public abstract class PageView extends ViewGroup {
+ private static final int HIGHLIGHT_COLOR = 0x802572AC;
+ private static final int LINK_COLOR = 0x80AC7225;
+ private static final int BACKGROUND_COLOR = 0xFFFFFFFF;
+ private static final int PROGRESS_DIALOG_DELAY = 200;
+ private final Context mContext;
+ protected int mPageNumber;
+ private Point mParentSize;
+ protected Point mSize; // Size of page at minimum zoom
+ protected float mSourceScale;
+
+ private ImageView mEntire; // Image rendered at minimum zoom
+ private BitmapHolder mEntireBmh;
+ private AsyncTask<Void,Void,TextWord[][]> mGetText;
+ private AsyncTask<Void,Void,LinkInfo[]> mGetLinkInfo;
+ private AsyncTask<Void,Void,Bitmap> mDrawEntire;
+
+ private Point mPatchViewSize; // View size on the basis of which the patch was created
+ private Rect mPatchArea;
+ private ImageView mPatch;
+ private BitmapHolder mPatchBmh;
+ private AsyncTask<PatchInfo,Void,PatchInfo> mDrawPatch;
+ private RectF mSearchBoxes[];
+ protected LinkInfo mLinks[];
+ private RectF mSelectBox;
+ private TextWord mText[][];
+ private View mSearchView;
+ private boolean mIsBlank;
+ private boolean mHighlightLinks;
+
+ private ProgressBar mBusyIndicator;
+ private final Handler mHandler = new Handler();
+
+ public PageView(Context c, Point parentSize) {
+ super(c);
+ mContext = c;
+ mParentSize = parentSize;
+ setBackgroundColor(BACKGROUND_COLOR);
+ mEntireBmh = new BitmapHolder();
+ mPatchBmh = new BitmapHolder();
+ }
+
+ protected abstract Bitmap drawPage(BitmapHolder h, int sizeX, int sizeY, int patchX, int patchY, int patchWidth, int patchHeight);
+ protected abstract Bitmap updatePage(BitmapHolder h, int sizeX, int sizeY, int patchX, int patchY, int patchWidth, int patchHeight);
+ protected abstract LinkInfo[] getLinkInfo();
+ protected abstract TextWord[][] getText();
+
+ private void reinit() {
+ // Cancel pending render task
+ if (mDrawEntire != null) {
+ mDrawEntire.cancel(true);
+ mDrawEntire = null;
+ }
+
+ if (mDrawPatch != null) {
+ mDrawPatch.cancel(true);
+ mDrawPatch = null;
+ }
+
+ if (mGetLinkInfo != null) {
+ mGetLinkInfo.cancel(true);
+ mGetLinkInfo = null;
+ }
+
+ if (mGetText != null) {
+ mGetText.cancel(true);
+ mGetText = null;
+ }
+
+ mIsBlank = true;
+ mPageNumber = 0;
+
+ if (mSize == null)
+ mSize = mParentSize;
+
+ if (mEntire != null) {
+ mEntire.setImageBitmap(null);
+ mEntireBmh.setBm(null);
+ }
+
+ if (mPatch != null) {
+ mPatch.setImageBitmap(null);
+ mPatchBmh.setBm(null);
+ }
+
+ mPatchViewSize = null;
+ mPatchArea = null;
+
+ mSearchBoxes = null;
+ mLinks = null;
+ mSelectBox = null;
+ mText = null;
+ }
+
+ public void releaseResources() {
+ reinit();
+
+ if (mBusyIndicator != null) {
+ removeView(mBusyIndicator);
+ mBusyIndicator = null;
+ }
+ }
+
+ public void blank(int page) {
+ reinit();
+ mPageNumber = page;
+
+ if (mBusyIndicator == null) {
+ mBusyIndicator = new ProgressBar(mContext);
+ mBusyIndicator.setIndeterminate(true);
+ mBusyIndicator.setBackgroundResource(R.drawable.busy);
+ addView(mBusyIndicator);
+ }
+ }
+
+ public void setPage(int page, PointF size) {
+ // Cancel pending render task
+ if (mDrawEntire != null) {
+ mDrawEntire.cancel(true);
+ mDrawEntire = null;
+ }
+
+ mIsBlank = false;
+
+ mPageNumber = page;
+ if (mEntire == null) {
+ mEntire = new OpaqueImageView(mContext);
+ mEntire.setScaleType(ImageView.ScaleType.FIT_CENTER);
+ addView(mEntire);
+ }
+
+ // Calculate scaled size that fits within the screen limits
+ // This is the size at minimum zoom
+ mSourceScale = Math.min(mParentSize.x/size.x, mParentSize.y/size.y);
+ Point newSize = new Point((int)(size.x*mSourceScale), (int)(size.y*mSourceScale));
+ mSize = newSize;
+
+ mEntire.setImageBitmap(null);
+ mEntireBmh.setBm(null);
+
+ // Get the link info in the background
+ mGetLinkInfo = new AsyncTask<Void,Void,LinkInfo[]>() {
+ protected LinkInfo[] doInBackground(Void... v) {
+ return getLinkInfo();
+ }
+
+ protected void onPostExecute(LinkInfo[] v) {
+ mLinks = v;
+ invalidate();
+ }
+ };
+
+ mGetLinkInfo.execute();
+
+ // Render the page in the background
+ mDrawEntire = new AsyncTask<Void,Void,Bitmap>() {
+ protected Bitmap doInBackground(Void... v) {
+ return drawPage(mEntireBmh, mSize.x, mSize.y, 0, 0, mSize.x, mSize.y);
+ }
+
+ protected void onPreExecute() {
+ mEntire.setImageBitmap(null);
+ mEntireBmh.setBm(null);
+
+ if (mBusyIndicator == null) {
+ mBusyIndicator = new ProgressBar(mContext);
+ mBusyIndicator.setIndeterminate(true);
+ mBusyIndicator.setBackgroundResource(R.drawable.busy);
+ addView(mBusyIndicator);
+ mBusyIndicator.setVisibility(INVISIBLE);
+ mHandler.postDelayed(new Runnable() {
+ public void run() {
+ if (mBusyIndicator != null)
+ mBusyIndicator.setVisibility(VISIBLE);
+ }
+ }, PROGRESS_DIALOG_DELAY);
+ }
+ }
+
+ protected void onPostExecute(Bitmap bm) {
+ removeView(mBusyIndicator);
+ mBusyIndicator = null;
+ mEntire.setImageBitmap(bm);
+ mEntireBmh.setBm(bm);
+ invalidate();
+ }
+ };
+
+ mDrawEntire.execute();
+
+ if (mSearchView == null) {
+ mSearchView = new View(mContext) {
+ @Override
+ protected void onDraw(final Canvas canvas) {
+ super.onDraw(canvas);
+ // Work out current total scale factor
+ // from source to view
+ final float scale = mSourceScale*(float)getWidth()/(float)mSize.x;
+ final Paint paint = new Paint();
+
+ if (!mIsBlank && mSearchBoxes != null) {
+ paint.setColor(HIGHLIGHT_COLOR);
+ for (RectF rect : mSearchBoxes)
+ canvas.drawRect(rect.left*scale, rect.top*scale,
+ rect.right*scale, rect.bottom*scale,
+ paint);
+ }
+
+ if (!mIsBlank && mLinks != null && mHighlightLinks) {
+ paint.setColor(LINK_COLOR);
+ for (LinkInfo link : mLinks)
+ canvas.drawRect(link.rect.left*scale, link.rect.top*scale,
+ link.rect.right*scale, link.rect.bottom*scale,
+ paint);
+ }
+
+ if (mSelectBox != null && mText != null) {
+ paint.setColor(HIGHLIGHT_COLOR);
+ TextSelector sel = new TextSelector(mText, mSelectBox) {
+ RectF rect;
+
+ @Override
+ protected void onStartLine() {
+ rect = new RectF();
+ }
+
+ @Override
+ protected void onWord(TextWord word) {
+ rect.union(word);
+ }
+
+ @Override
+ protected void onEndLine() {
+ if (!rect.isEmpty())
+ canvas.drawRect(rect.left*scale, rect.top*scale, rect.right*scale, rect.bottom*scale, paint);
+ }
+ };
+
+ sel.select();
+ }
+ }
+ };
+
+ addView(mSearchView);
+ }
+ requestLayout();
+ }
+
+ public void setSearchBoxes(RectF searchBoxes[]) {
+ mSearchBoxes = searchBoxes;
+ if (mSearchView != null)
+ mSearchView.invalidate();
+ }
+
+ public void setLinkHighlighting(boolean f) {
+ mHighlightLinks = f;
+ if (mSearchView != null)
+ mSearchView.invalidate();
+ }
+
+ public void deselectText() {
+ mSelectBox = null;
+ mSearchView.invalidate();
+ }
+
+ public void selectText(float x0, float y0, float x1, float y1) {
+ float scale = mSourceScale*(float)getWidth()/(float)mSize.x;
+ float docRelX0 = (x0 - getLeft())/scale;
+ float docRelY0 = (y0 - getTop())/scale;
+ float docRelX1 = (x1 - getLeft())/scale;
+ float docRelY1 = (y1 - getTop())/scale;
+ // Order on Y but maintain the point grouping
+ if (docRelY0 <= docRelY1)
+ mSelectBox = new RectF(docRelX0, docRelY0, docRelX1, docRelY1);
+ else
+ mSelectBox = new RectF(docRelX1, docRelY1, docRelX0, docRelY0);
+
+ mSearchView.invalidate();
+
+ if (mGetText == null) {
+ mGetText = new AsyncTask<Void,Void,TextWord[][]>() {
+ @Override
+ protected TextWord[][] doInBackground(Void... params) {
+ return getText();
+ }
+ @Override
+ protected void onPostExecute(TextWord[][] result) {
+ mText = result;
+ mSearchView.invalidate();
+ }
+ };
+
+ mGetText.execute();
+ }
+ }
+
+ public boolean copySelection() {
+ final StringBuilder text = new StringBuilder();
+
+ TextSelector sel = new TextSelector(mText, mSelectBox) {
+ StringBuilder line;
+
+ @Override
+ protected void onStartLine() {
+ line = new StringBuilder();
+ }
+
+ @Override
+ protected void onWord(TextWord word) {
+ if (line.length() > 0)
+ line.append(' ');
+ line.append(word.w);
+ }
+
+ @Override
+ protected void onEndLine() {
+ if (text.length() > 0)
+ text.append('\n');
+ text.append(line);
+ }
+ };
+
+ sel.select();
+
+ if (text.length() == 0)
+ return false;
+
+ ClipboardManager cm = (ClipboardManager) mContext.getSystemService(Context.CLIPBOARD_SERVICE);
+
+ cm.setPrimaryClip(ClipData.newPlainText("MuPDF", text));
+
+ mSelectBox = null;
+ mSearchView.invalidate();
+
+ return true;
+ }
+
+ @Override
+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+ int x, y;
+ switch(View.MeasureSpec.getMode(widthMeasureSpec)) {
+ case View.MeasureSpec.UNSPECIFIED:
+ x = mSize.x;
+ break;
+ default:
+ x = View.MeasureSpec.getSize(widthMeasureSpec);
+ }
+ switch(View.MeasureSpec.getMode(heightMeasureSpec)) {
+ case View.MeasureSpec.UNSPECIFIED:
+ y = mSize.y;
+ break;
+ default:
+ y = View.MeasureSpec.getSize(heightMeasureSpec);
+ }
+
+ setMeasuredDimension(x, y);
+
+ if (mBusyIndicator != null) {
+ int limit = Math.min(mParentSize.x, mParentSize.y)/2;
+ mBusyIndicator.measure(View.MeasureSpec.AT_MOST | limit, View.MeasureSpec.AT_MOST | limit);
+ }
+ }
+
+ @Override
+ protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+ int w = right-left;
+ int h = bottom-top;
+
+ if (mEntire != null) {
+ mEntire.layout(0, 0, w, h);
+ }
+
+ if (mSearchView != null) {
+ mSearchView.layout(0, 0, w, h);
+ }
+
+ if (mPatchViewSize != null) {
+ if (mPatchViewSize.x != w || mPatchViewSize.y != h) {
+ // Zoomed since patch was created
+ mPatchViewSize = null;
+ mPatchArea = null;
+ if (mPatch != null) {
+ mPatch.setImageBitmap(null);
+ mPatchBmh.setBm(null);
+ }
+ } else {
+ mPatch.layout(mPatchArea.left, mPatchArea.top, mPatchArea.right, mPatchArea.bottom);
+ }
+ }
+
+ if (mBusyIndicator != null) {
+ int bw = mBusyIndicator.getMeasuredWidth();
+ int bh = mBusyIndicator.getMeasuredHeight();
+
+ mBusyIndicator.layout((w-bw)/2, (h-bh)/2, (w+bw)/2, (h+bh)/2);
+ }
+ }
+
+ public void addHq(boolean update) {
+ Rect viewArea = new Rect(getLeft(),getTop(),getRight(),getBottom());
+ // If the viewArea's size matches the unzoomed size, there is no need for an hq patch
+ if (viewArea.width() != mSize.x || viewArea.height() != mSize.y) {
+ Point patchViewSize = new Point(viewArea.width(), viewArea.height());
+ Rect patchArea = new Rect(0, 0, mParentSize.x, mParentSize.y);
+
+ // Intersect and test that there is an intersection
+ if (!patchArea.intersect(viewArea))
+ return;
+
+ // Offset patch area to be relative to the view top left
+ patchArea.offset(-viewArea.left, -viewArea.top);
+
+ boolean area_unchanged = patchArea.equals(mPatchArea) && patchViewSize.equals(mPatchViewSize);
+
+ // If being asked for the same area as last time and not because of an update then nothing to do
+ if (area_unchanged && !update)
+ return;
+
+ boolean completeRedraw = !(area_unchanged && update);
+
+ // Stop the drawing of previous patch if still going
+ if (mDrawPatch != null) {
+ mDrawPatch.cancel(true);
+ mDrawPatch = null;
+ }
+
+ if (completeRedraw) {
+ // The bitmap holder mPatchBm may still be rendered to by a
+ // previously invoked task, and possibly for a different
+ // area, so we cannot risk the bitmap generated by this task
+ // being passed to it
+ mPatchBmh.setBm(null);
+ mPatchBmh = new BitmapHolder();
+ }
+
+ // Create and add the image view if not already done
+ if (mPatch == null) {
+ mPatch = new OpaqueImageView(mContext);
+ mPatch.setScaleType(ImageView.ScaleType.FIT_CENTER);
+ addView(mPatch);
+ mSearchView.bringToFront();
+ }
+
+ mDrawPatch = new AsyncTask<PatchInfo,Void,PatchInfo>() {
+ protected PatchInfo doInBackground(PatchInfo... v) {
+ if (v[0].completeRedraw) {
+ v[0].bm = drawPage(v[0].bmh, v[0].patchViewSize.x, v[0].patchViewSize.y,
+ v[0].patchArea.left, v[0].patchArea.top,
+ v[0].patchArea.width(), v[0].patchArea.height());
+ } else {
+ v[0].bm = updatePage(v[0].bmh, v[0].patchViewSize.x, v[0].patchViewSize.y,
+ v[0].patchArea.left, v[0].patchArea.top,
+ v[0].patchArea.width(), v[0].patchArea.height());
+ }
+
+ return v[0];
+ }
+
+ protected void onPostExecute(PatchInfo v) {
+ if (mPatchBmh == v.bmh) {
+ mPatchViewSize = v.patchViewSize;
+ mPatchArea = v.patchArea;
+ if (v.bm != null) {
+ mPatch.setImageBitmap(v.bm);
+ v.bmh.setBm(v.bm);
+ v.bm = null;
+ }
+ //requestLayout();
+ // Calling requestLayout here doesn't lead to a later call to layout. No idea
+ // why, but apparently others have run into the problem.
+ mPatch.layout(mPatchArea.left, mPatchArea.top, mPatchArea.right, mPatchArea.bottom);
+ invalidate();
+ }
+ }
+ };
+
+ mDrawPatch.execute(new PatchInfo(patchViewSize, patchArea, mPatchBmh, completeRedraw));
+ }
+ }
+
+ public void update() {
+ // Cancel pending render task
+ if (mDrawEntire != null) {
+ mDrawEntire.cancel(true);
+ mDrawEntire = null;
+ }
+
+ if (mDrawPatch != null) {
+ mDrawPatch.cancel(true);
+ mDrawPatch = null;
+ }
+
+ // Render the page in the background
+ mDrawEntire = new AsyncTask<Void,Void,Bitmap>() {
+ protected Bitmap doInBackground(Void... v) {
+ // Pass the current bitmap as a basis for the update, but use a bitmap
+ // holder so that the held bitmap will be nulled and not hold on to
+ // memory, should this view become redundant.
+ return updatePage(mEntireBmh, mSize.x, mSize.y, 0, 0, mSize.x, mSize.y);
+ }
+
+ protected void onPostExecute(Bitmap bm) {
+ if (bm != null) {
+ mEntire.setImageBitmap(bm);
+ mEntireBmh.setBm(bm);
+ }
+ invalidate();
+ }
+ };
+
+ mDrawEntire.execute();
+
+ addHq(true);
+ }
+
+ public void removeHq() {
+ // Stop the drawing of the patch if still going
+ if (mDrawPatch != null) {
+ mDrawPatch.cancel(true);
+ mDrawPatch = null;
+ }
+
+ // And get rid of it
+ mPatchViewSize = null;
+ mPatchArea = null;
+ if (mPatch != null) {
+ mPatch.setImageBitmap(null);
+ mPatchBmh.setBm(null);
+ }
+ }
+
+ public int getPage() {
+ return mPageNumber;
+ }
+
+ @Override
+ public boolean isOpaque() {
+ return true;
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-21 01:50:22 +0000