public void Draw()
{
GlyphPlanList glyphPlans = _line._glyphPlans;
List <UserCharToGlyphIndexMap> userCharToGlyphIndexMap = _line._userCharToGlyphMap;
if (_line.ContentChanged)
{
//re-calculate
char[] textBuffer = _line._charBuffer.ToArray();
glyphPlans.Clear();
userCharToGlyphIndexMap.Clear();
//read glyph plan and userCharToGlyphIndexMap
_printer.GenerateGlyphPlan(textBuffer, 0, textBuffer.Length, glyphPlans, userCharToGlyphIndexMap);
toPxScale = _printer.Typeface.CalculateScaleToPixelFromPointSize(_printer.FontSizeInPoints);
_line.ContentChanged = false;
}
if (glyphPlans.Count > 0)
{
_printer.DrawFromGlyphPlans(glyphPlans, X, Y);
//draw caret
//not blink in this version
int caret_index = _line.CaretCharIndex;
//find caret pos based on glyph plan
//TODO: check when do gsub (glyph number may not match with user char number)
if (caret_index == 0)
{
_printer.DrawCaret(X, this.Y);
}
else
{
UserCharToGlyphIndexMap map = userCharToGlyphIndexMap[caret_index - 1];
GlyphPlan p = glyphPlans[map.glyphIndexListOffset_plus1 + map.len - 2];
_printer.DrawCaret(X + p.ExactRight, this.Y);
}
}
else
{
_printer.DrawCaret(X, this.Y);
}
}
public void DoLeft()
{
int count = _charBuffer.Count;
if (count == 0)
{
_caretCharIndex = 0;
return;
}
else if (_caretCharIndex > 0)
{
//this is on the end
_caretCharIndex--;
//check if the caret can rest on this glyph?
if (_caretCharIndex > 0)
{
//find its mapping to glyph index
UserCharToGlyphIndexMap userCharToGlyphMap = _userCharToGlyphMap[_caretCharIndex];
int mapToGlyphIndex = userCharToGlyphMap.glyphIndexListOffset_plus1;
//
if (mapToGlyphIndex == 0)
{
//no map
DoLeft(); //recursive ***
return;
}
//-------------------------
//we -1 ***
GlyphPlan glyphPlan = _glyphPlans[userCharToGlyphMap.glyphIndexListOffset_plus1 - 1];
if (glyphPlan.advX <= 0)
{
//caret can't rest here
//so
DoLeft(); //recursive ***
return;
}
//---------------------
//
}
}
else
{
}
}
public void DoRight()
{
int count = _charBuffer.Count;
if (count == 0)
{
return;
}
else if (_caretCharIndex < count)
{
//this is on the end
_caretCharIndex++;
//check if the caret can rest on this glyph?
if (_caretCharIndex < count)
{
//find its mapping to glyph index
UserCharToGlyphIndexMap userCharToGlyphMap = _userCharToGlyphMap[_caretCharIndex];
int mapToGlyphIndex = userCharToGlyphMap.glyphIndexListOffset_plus1;
//
if (mapToGlyphIndex == 0)
{
//no map
DoRight(); //recursive ***
return;
}
//-------------------------
//we -1 ***
GlyphPlan glyphPlan = _glyphPlans[userCharToGlyphMap.glyphIndexListOffset_plus1 - 1];
if (!glyphPlan.AdvanceMoveForward)
{
//caret can't rest here
//so
DoRight(); //recursive ***
return;
}
}
}
else
{
}
}
public void SetCharIndexFromPos(float x, float y, float toPxScale)
{
int count = _glyphPlans.Count;
float accum_x = 0;
for (int i = 0; i < count; ++i)
{
float thisGlyphW = _glyphPlans[i].advX * toPxScale;
accum_x += thisGlyphW;
if (accum_x > x)
{
//TODO: review here
//for some glyph that has been substitued
//glyph may not match with actual user char in the _line
float xoffset_on_glyph = (x - (accum_x - thisGlyphW));
if (xoffset_on_glyph >= (thisGlyphW / 2))
{
_caretCharIndex = i + 1;
//check if the caret can rest on this pos or not
UserCharToGlyphIndexMap map = _userCharToGlyphMap[_caretCharIndex];
if (map.glyphIndexListOffset_plus1 == 0)
{
//no map
//cant rest here
if (_caretCharIndex < count)
{
DoRight();
}
}
else
{
//has map
if (_caretCharIndex < count && _glyphPlans[map.glyphIndexListOffset_plus1 - 1].advX <= 0)
{
//recursive ***
DoRight(); //
}
}
}
else
{
_caretCharIndex = i;
//check if the caret can rest on this pos or not
UserCharToGlyphIndexMap map = _userCharToGlyphMap[_caretCharIndex];
if (map.glyphIndexListOffset_plus1 == 0)
{
//no map
//cant rest here
if (_caretCharIndex > 0)
{
//recursive ***
DoLeft();
}
}
else
{
//has map
if (_caretCharIndex < count && _glyphPlans[map.glyphIndexListOffset_plus1 - 1].advX <= 0)
{
//recursive ***
DoLeft();
}
}
}
//stop
break;
}
}
}