/**
* 根据起始位置指针，读取一页内容
*
* @return
*/
private Vector pageDown()
{
Java.Lang.String strParagraph = new Java.Lang.String();
Vector lines = new Vector();
int paraSpace = 0;
mPageLineCount = mVisibleHeight / (mFontSize + mLineSpace);
while ((lines.Size() < mPageLineCount) && (curEndPos < mbBufferLen))
{
byte[] parabuffer = readParagraphForward(curEndPos);
curEndPos += parabuffer.Length;
try
{
strParagraph = new Java.Lang.String(parabuffer, charset);
}
catch (UnsupportedEncodingException e)
{
e.PrintStackTrace();
}
strParagraph = new Java.Lang.String(strParagraph.ReplaceAll("\r\n", " "));
strParagraph = new Java.Lang.String(strParagraph.ReplaceAll("\n", " ")); // 段落中的换行符去掉，绘制的时候再换行
while (strParagraph.Length() > 0)
{
int paintSize = mPaint.BreakText(strParagraph.ToString(), true, mVisibleWidth, null);
lines.Add(strParagraph.Substring(0, paintSize));
strParagraph = new Java.Lang.String(strParagraph.Substring(paintSize));
if (lines.Size() >= mPageLineCount)
{
break;
}
}
lines.Set(lines.Size() - 1, lines.Get(lines.Size() - 1) + "@");
if (strParagraph.Length() != 0)
{
try
{
curEndPos -= (strParagraph).GetBytes(charset).Length;
}
catch (UnsupportedEncodingException e)
{
e.PrintStackTrace();
}
}
paraSpace += mLineSpace;
mPageLineCount = (mVisibleHeight - paraSpace) / (mFontSize + mLineSpace);
}
return(lines);
}
/**
* 指针移到上一页页首
*/
private void pageUp()
{
Java.Lang.String strParagraph = new Java.Lang.String();
Vector lines = new Vector(); // 页面行
int paraSpace = 0;
mPageLineCount = mVisibleHeight / (mFontSize + mLineSpace);
while ((lines.Size() < mPageLineCount) && (curBeginPos > 0))
{
Vector paraLines = new Vector(); // 段落行
byte[] parabuffer = readParagraphBack(curBeginPos); // 1.读取上一个段落
curBeginPos -= parabuffer.Length; // 2.变换起始位置指针
try
{
strParagraph = new Java.Lang.String(parabuffer, charset);
}
catch (UnsupportedEncodingException e)
{
e.PrintStackTrace();
}
strParagraph = new Java.Lang.String(strParagraph.ReplaceAll("\r\n", " "));
strParagraph = new Java.Lang.String(strParagraph.ReplaceAll("\n", " "));
while (strParagraph.Length() > 0)
{ // 3.逐行添加到lines
int paintSize = mPaint.BreakText(strParagraph.ToString(), true, mVisibleWidth, null);
paraLines.Add(strParagraph.Substring(0, paintSize));
strParagraph = new Java.Lang.String(strParagraph.Substring(paintSize));
}
lines.AddAll(0, paraLines.ToArray());
while (lines.Size() > mPageLineCount)
{ // 4.如果段落添加完，但是超出一页，则超出部分需删减
try
{
curBeginPos += (new Java.Lang.String(lines.Get(0).ToString())).GetBytes(charset).Length; // 5.删减行数同时起始位置指针也要跟着偏移
lines.Remove(0);
}
catch (UnsupportedEncodingException e)
{
e.PrintStackTrace();
}
}
curEndPos = curBeginPos; // 6.最后结束指针指向下一段的开始处
paraSpace += mLineSpace;
mPageLineCount = (mVisibleHeight - paraSpace) / (mFontSize + mLineSpace); // 添加段落间距，实时更新容纳行数
}
}
internal Uri WriteBinaryToFile(string key, bool writeToCacheDirectory)
{
ProtectedBinary pb = Entry.Binaries.Get(key);
System.Diagnostics.Debug.Assert(pb != null);
if (pb == null)
{
throw new ArgumentException();
}
ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(this);
string binaryDirectory = prefs.GetString(GetString(Resource.String.BinaryDirectory_key), GetString(Resource.String.BinaryDirectory_default));
if (writeToCacheDirectory)
{
binaryDirectory = CacheDir.Path + File.Separator + AttachmentContentProvider.AttachmentCacheSubDir;
}
string filepart = key;
if (writeToCacheDirectory)
{
Java.Lang.String javaFilename = new Java.Lang.String(filepart);
filepart = javaFilename.ReplaceAll("[^a-zA-Z0-9.-]", "_");
}
var targetFile = new File(binaryDirectory, filepart);
File parent = targetFile.ParentFile;
if (parent == null || (parent.Exists() && !parent.IsDirectory))
{
Toast.MakeText(this,
Resource.String.error_invalid_path,
ToastLength.Long).Show();
return(null);
}
if (!parent.Exists())
{
// Create parent directory
if (!parent.Mkdirs())
{
Toast.MakeText(this,
Resource.String.error_could_not_create_parent,
ToastLength.Long).Show();
return(null);
}
}
string filename = targetFile.AbsolutePath;
Uri fileUri = Uri.FromFile(targetFile);
byte[] pbData = pb.ReadData();
try
{
System.IO.File.WriteAllBytes(filename, pbData);
}
catch (Exception exWrite)
{
Toast.MakeText(this, GetString(Resource.String.SaveAttachment_Failed, new Java.Lang.Object[] { filename })
+ exWrite.Message, ToastLength.Long).Show();
return(null);
}
finally
{
MemUtil.ZeroByteArray(pbData);
}
Toast.MakeText(this, GetString(Resource.String.SaveAttachment_doneMessage, new Java.Lang.Object[] { filename }), ToastLength.Short).Show();
if (writeToCacheDirectory)
{
return(Uri.Parse("content://" + AttachmentContentProvider.Authority + "/"
+ filename));
}
return(fileUri);
}