// Generate new items inheriting properties from the previous
public MHTextItem NewItem()
{
MHTextItem pItem = new MHTextItem();
pItem.m_Colour = m_Colour;
return(pItem);
}
// UK MHEG specifies the use of the Tiresias font and broadcasters appear to
// assume that all MHEG applications will lay the text out in the same way.
// Recreate the image.
protected void Redraw()
{
if (!RunningStatus || m_pDisplay == null)
{
return;
}
if (m_nBoxWidth == 0 || m_nBoxHeight == 0)
{
return; // Can't draw zero sized boxes.
}
m_pDisplay.SetSize(m_nBoxWidth, m_nBoxHeight);
m_pDisplay.Clear();
MHRgba textColour = GetColour(m_textColour);
// Process any escapes in the text and construct the text arrays.
MHSequence <MHTextLine> theText = new MHSequence <MHTextLine>();
// Set up the first item on the first line.
MHTextItem pCurrItem = new MHTextItem();
MHTextLine pCurrLine = new MHTextLine();
pCurrLine.Items.Append(pCurrItem);
theText.Append(pCurrLine);
Stack <MHRgba> m_ColourStack = new Stack <MHRgba>(); // Stack to handle nested colour codes.
m_ColourStack.Push(textColour);
pCurrItem.Colour = textColour;
int i = 0;
while (i < m_Content.Size)
{
char ch = m_Content.GetAt(i++);
if (ch == '\t') // Tab - start a new item if we have any text in the existing one.
{
if (pCurrItem.Text.Size != 0)
{
pCurrItem = pCurrItem.NewItem();
pCurrLine.Items.Append(pCurrItem);
}
pCurrItem.TabCount++;
}
else if (ch == '\r') // CR - line break.
// TODO: Two CRs next to one another are treated as </P> rather than <BR><BR>
// This should also include the sequence CRLFCRLF.
{
pCurrLine = new MHTextLine();
theText.Append(pCurrLine);
pCurrItem = pCurrItem.NewItem();
pCurrLine.Items.Append(pCurrItem);
}
else if (ch == 0x1b) // Escape - special codes.
{
if (i == m_Content.Size)
{
break;
}
char code = m_Content.GetAt(i);
// The only codes we are interested in are the start and end of colour.
// TODO: We may also need "bold" and some hypertext colours.
if (code >= 0x40 && code <= 0x5e) // Start code
// Start codes are followed by a parameter count and a number of parameter bytes.
{
if (++i == m_Content.Size)
{
break;
}
char paramCount = m_Content.GetAt(i);
i++;
if (code == 0x43 && paramCount == 4 && i + paramCount <= m_Content.Size)
{
// Start of colour.
if (pCurrItem.Text.Size != 0)
{
pCurrItem = pCurrItem.NewItem(); pCurrLine.Items.Append(pCurrItem);
}
pCurrItem.Colour = new MHRgba(m_Content.GetAt(i), m_Content.GetAt(i + 1),
m_Content.GetAt(i + 2), 255 - m_Content.GetAt(i + 3));
// Push this colour onto the colour stack.
m_ColourStack.Push(pCurrItem.Colour);
}
else
{
Logging.Log(Logging.MHLogWarning, "Unknown text escape code " + code);
}
i += paramCount; // Skip the parameters
}
else if (code >= 0x60 && code <= 0x7e) // End code.
{
i++;
if (code == 0x63)
{
if (m_ColourStack.Count > 1)
{
m_ColourStack.Pop();
// Start a new item since we're using a new colour.
if (pCurrItem.Text.Size != 0)
{
pCurrItem = pCurrItem.NewItem();
pCurrLine.Items.Append(pCurrItem);
}
// Set the subsequent text in the colour we're using now.
pCurrItem.Colour = m_ColourStack.Peek();
}
}
}
}
else if (ch <= 0x1f)
{
// Certain characters including LF and the marker codes between 0x1c and 0x1f are
// explicitly intended to be ignored. Include all the other codes.
}
else // Add to the current text.
{
int nStart = i - 1;
while (i < m_Content.Size && m_Content.GetAt(i) >= 0x20)
{
i++;
}
pCurrItem.Text.Append(new MHOctetString(m_Content, nStart, i - nStart));
}
}
// Set up the initial attributes.
int style, size, lineSpace, letterSpace;
InterpretAttributes(m_fontAttrs, out style, out size, out lineSpace, out letterSpace);
// Create a font with this information.
m_pDisplay.SetFont(size, (style & 2) != 0, (style & 1) != 0);
// Calculate the layout of each section.
for (i = 0; i < theText.Size; i++)
{
MHTextLine pLine = theText.GetAt(i);
pLine.LineWidth = 0;
for (int j = 0; j < pLine.Items.Size; j++)
{
MHTextItem pItem = pLine.Items.GetAt(j);
// Set any tabs.
for (int k = 0; k < pItem.TabCount; k++)
{
pLine.LineWidth += TABSTOP - pLine.LineWidth % TABSTOP;
}
if (pItem.UnicodeLength == 0)
{ // Convert UTF-8 to Unicode.
int s = pItem.Text.Size;
pItem.Unicode = pItem.Text.ToString();
pItem.UnicodeLength = pItem.Unicode.Length;
}
// Fit the text onto the line.
int nFullText = pItem.UnicodeLength;
// Get the box size and update pItem.m_nUnicode to the number that will fit.
Rectangle rect = m_pDisplay.GetBounds(pItem.Unicode, ref nFullText, m_nBoxWidth - pLine.LineWidth);
if (nFullText == pItem.UnicodeLength || !m_fTextWrap)
{
// All the characters fit or we're not wrapping.
pItem.Width = rect.Width;
pLine.LineWidth += rect.Width;
}
/* else if (m_fTextWrap)
* { // No, we have to word-wrap.
* int nTruncated = pItem.UnicodeLength; // Just in case.
* // Now remove characters until we find a word-break character.
* while (pItem.UnicodeLength > 0 && pItem.Unicode[pItem.UnicodeLength] != ' ') pItem.UnicodeLength--;
* // If there are now word-break characters we truncate the text.
* if (pItem.UnicodeLength == 0) pItem.UnicodeLength = nTruncated;
* // Special case to avoid infinite loop if the box is very narrow.
* if (pItem.UnicodeLength == 0) pItem.UnicodeLength = 1;
*
* // We need to move the text we've cut off this line into a new line.
* int nNewWidth = nFullText - pItem.UnicodeLength;
* int nNewStart = pItem.UnicodeLength;
* // Remove any spaces at the start of the new section.
* while (nNewWidth != 0 && pItem.Unicode[nNewStart] == ' ') { nNewStart++; nNewWidth--; }
* if (nNewWidth != 0) {
* // Create a new line from the extra text.
* MHTextLine pNewLine = new MHTextLine();
* theText.InsertAt(pNewLine, i+1);
* // The first item on the new line is the rest of the text.
* MHTextItem pNewItem = pItem.NewItem();
* pNewLine.Items.Append(pNewItem);
* pNewItem.Unicode = pItem.Unicode.Substring(nNewStart, nNewWidth);
* pNewItem.UnicodeLength = nNewWidth;
* }
* // Remove any spaces at the end of the old section. If we don't do that and
* // we are centering or right aligning the text we'll get it wrong.
* while (pItem.UnicodeLength > 1 && pItem.Unicode[pItem.UnicodeLength - 1] == ' ') pItem.UnicodeLength--;
* int uniLength = pItem.UnicodeLength;
* rect = m_pDisplay.GetBounds(pItem.Unicode, ref uniLength, 0);
* pItem.Width = rect.Width;
* pLine.LineWidth += rect.Width;
* }
*/}
}
// Now output the text.
int yOffset = 0;
// If there isn't space for all the lines we should drop extra lines.
int nNumLines = theText.Size;
do
{
if (m_VertJ == End)
{
yOffset = m_nBoxHeight - nNumLines * lineSpace;
}
else if (m_VertJ == Centre)
{
yOffset = (m_nBoxHeight - nNumLines * lineSpace) / 2;
}
if (yOffset < 0)
{
nNumLines--;
}
} while (yOffset < 0);
for (i = 0; i < nNumLines; i++)
{
MHTextLine pLine = theText.GetAt(i);
int xOffset = 0;
if (m_HorizJ == End)
{
xOffset = m_nBoxWidth - pLine.LineWidth;
}
else if (m_HorizJ == Centre)
{
xOffset = (m_nBoxWidth - pLine.LineWidth) / 2;
}
//ASSERT(xOffset >= 0);
for (int j = 0; j < pLine.Items.Size; j++)
{
MHTextItem pItem = pLine.Items.GetAt(j);
// Tab across if necessary.
for (int k = 0; k < pItem.TabCount; k++)
{
xOffset += TABSTOP - xOffset % TABSTOP;
}
if (pItem.Unicode.Length != 0) // We may have blank lines.
{
m_pDisplay.AddText(xOffset, yOffset, // Jas removed this cos it doesn't make sense yOffset + lineSpace
pItem.Unicode.Substring(0, pItem.UnicodeLength), pItem.Colour);
}
xOffset += pItem.Width;
}
yOffset += lineSpace;
if (yOffset + lineSpace > m_nBoxHeight)
{
break;
}
}
}
