VOID TextFlow::position_lines(FramePtr frame, VERT_ALIGN_TYPE align_type)
{
PCOORD y_offset;
L_INDEX l_index;
LINE_PTR lp;
PBOX refresh_offsets;
PBOX bound = frame->get_bound();
PCOORD baseline;
/*
// Compute the height of all the lines so we can know how to align them.
*/
y_offset = 0;
baseline = 0;
SHORT line_count = frame->number_of_lines();
if (line_count == 0)
{
refresh_offsets.x0 = 0;
refresh_offsets.x1 = 0;
}
else
{
PCOORD xmin, xmax;
xmin = 0x7fffffff;
xmax = -xmin;
for (lp = frame->get_line(0), l_index = 0; l_index < line_count; lp++, l_index++)
{
xmin = __min(xmin, lp->refresh_xmin);
xmax = __max(xmax, lp->refresh_xmax);
if (l_index == 0)
{
baseline = y_offset + lp->ascend;
}
else
{
baseline = y_offset + lp->line_spacing - lp->descend;
}
y_offset = baseline + lp->descend;
}
refresh_offsets.x0 = xmin;
refresh_offsets.x1 = xmax;
}
/*
// Compute the offset value from the height of the text and the frame height.
*/
if ((y_offset = bound.y1 - bound.y0 - y_offset) > 0)
{
switch (align_type)
{
case ALIGN_top:
{
y_offset = 0;
break;
}
case ALIGN_middle:
{
y_offset /= 2;
break;
}
case ALIGN_bottom:
default:
{
break;
}
}
}
else
{
/* Text too big for frame. Top align it. */
y_offset = 0;
}
refresh_offsets.y0 = y_offset;
/*
// We have the amount to offset. Do the offset now.
*/
for (lp = frame->get_line(0), l_index = 0; l_index < line_count; lp++, l_index++)
{
if (l_index == 0)
{
y_offset += lp->ascend;
}
else
{
y_offset += lp->line_spacing - lp->descend;
}
if (y_offset != lp->baseline)
{
if (lp->baseline != -1)
{
add_line_refresh_extent(frame, lp);
}
lp->baseline = y_offset;
add_line_refresh_extent(frame, lp);
}
y_offset += lp->descend;
}
refresh_offsets.y1 = __min(y_offset, bound.y1 - bound.y0);
frame->set_refresh_offsets(refresh_offsets);
}
ERRORCODE TextFlow::rebuild_lines(FrameObjectPtr object, WORD_RANGE wrange)
{
ERRORCODE error;
DB_RECORD_NUMBER f_record = object->get_frame_record();
FramePtr frame;
DB_RECORD_NUMBER p_record;
ParagraphPtr paragraph;
W_INDEX w_index;
TEXT_WORD_PTR wp;
PCOORD line_top;
LINE_PTR lp;
L_INDEX l_index;
PCOORD frame_extent, frame_left, tab_size;
PCOORD baseline;
BOOL use_white_space;
FLAGS frame_flags;
frame_object = object;
/*
// Text is flowed by placing text words into lines within a frame.
// Words are flowed until the end is reached and then until words stop moving.
*/
if ((frame = (FramePtr)database->get_record(f_record, &error, RECORD_TYPE_Frame)) == NULL)
{
return error;
}
frame_flags = frame->get_flags();
/*
// See if we need to do any stretching.
*/
if (frame_flags & (FRAME_FLAG_stretch_frame | FRAME_FLAG_stretch_text))
{
if (frame_flags & FRAME_FLAG_stretch_frame)
{
SHORT error;
/* Stretch the frame before flowing. */
if ((error = object->stretch_frame()) != 0)
{
frame->release();
if (error > 0)
{
error = ERRORCODE_None;
}
return (ERRORCODE)error;
}
/* Frame did not change size. Flow normally. */
}
#if 0
else
#else
/* Always check (or check, too). */
if (frame_flags & FRAME_FLAG_stretch_text)
#endif
{
/* Stretch the text before flowing. */
if ((error = frame->stretch_text()) != ERRORCODE_None)
{
frame->release();
return error;
}
/* Flow all the text. */
wrange.w_start = wrange.w_end = -1;
}
}
p_record = frame->get_paragraph();
if ((paragraph = (ParagraphPtr)database->get_record(p_record, &error, RECORD_TYPE_Paragraph)) == NULL)
{
frame->release();
return error;
}
/*
// Ascertain the true start and end of the text flow request.
*/
SHORT word_count = paragraph->number_of_words();
if (wrange.w_start < 0)
{
wrange.w_start = 0;
}
if (wrange.w_end < 0)
{
wrange.w_end = word_count-1;
}
if (wrange.w_start > wrange.w_end || wrange.w_end >= word_count)
{
/* Error of a parameter nature. */
paragraph->release();
frame->release();
return ERRORCODE_BadParameter;
}
/*
// Find the line where the desired word starts.
// If the word hasn't been flowed yet, it may be "between" existing lines.
// If a word is not in a line, we'll shove it into the line just following it.
// This should always be possible, because the EOP word should always be
// flowed and in a line (and no word should come after it).
//
// We can do this really easily by just checking the last word in the line.
// If we are before that line, we have our line.
*/
SHORT line_count = frame->number_of_lines();
for (lp = frame->get_line(0), l_index = 0;
l_index < line_count;
l_index++, lp++)
{
/* MH 4/25/93 this was "if (lp->w_end >= wrange.w_start)" */
if (lp->w_end + 1 >= wrange.w_start)
{
break;
}
}
/*
// Adjust w_start to the start of the line or our word, whichever is first.
*/
if (wrange.w_start > lp->w_start)
{
wrange.w_start = lp->w_start;
}
#ifdef DEBUG_RL
printf("Flow words from %d to %d @ line %d\n", wrange.w_start, wrange.w_end, l_index);
#endif
/*
// Now, we have the line (l_index) and the first word to flow (w_start) into
// it. Let's do some flowin'!
*/
/* Compute the flowable extent and the size of a tab. */
TextStyleRef style = paragraph->get_style();
PBOX bound = frame->get_bound();
frame_left = style.get_left_margin();
frame_extent = bound.x1 - bound.x0
- (style.get_left_margin() + style.get_right_margin());
use_white_space = frame_flags & FRAME_FLAG_use_white_space;
if ((tab_size = frame_extent / 16) == 0)
{
tab_size = 1;
}
/* Compute the current top of line. */
baseline = lp->baseline;
line_top = baseline - lp->ascend;
#ifdef DEBUG_RL
printf("current baseline: %ld, ascend: %ld, line_top:%ld\n",
baseline, lp->ascend, line_top);
#endif
for (w_index = wrange.w_start, wp = paragraph->get_word(w_index);; )
{
PCOORD extent; /* Horizontal extent. */
PCOORD x_offset; /* Horizontal position. */
PCOORD solid_x_offset;
LINE old_line;
BOOL line_changed;
#ifdef DEBUG_RL
printf("(flow next line)\n");
#endif
/* Remember the old line so we can tell if it moved. */
old_line = *lp;
/* Start a new line. */
lp->w_start = w_index;
/* Initialize the horizontal extent. */
extent = frame_extent;
/* Plug in parameters for this line and update line_top. */
lp->ascend = lp->descend = lp->line_spacing = 0;
baseline = line_top;
/* Start us at the left margin. */
x_offset = 0;
solid_x_offset = 0;
/* Flow words into this line until done (possibly passing w_end). */
while (w_index < word_count)
{
FLAGS flags = wp->flags;
/* Calculate tab width if necessary. */
if (wp->type == WORD_TYPE_tab)
{
wp->width = ((x_offset + tab_size)/tab_size)*tab_size - x_offset;
}
/* See if this word will fit in the row. */
#ifdef DEBUG_RL
printf("flow word ");
dump_word(paragraph, wp);
printf("...");
#endif
if (flags & WORD_FLAG_override)
{
/* Something is overridden. */
wp->flags &= ~WORD_FLAG_override;
if (flags & WORD_FLAG_override_flow)
{
/*
// A flow word!
// Note that the flags have been cleared, so we won't keep
// hitting this.
*/
break;
}
}
else if (x_offset + wp->width > extent /* doesn't fit */
&& w_index != lp->w_start /* not first word */
&& !(wp->type == WORD_TYPE_space
&& ((wp-1)->type == WORD_TYPE_solid
|| (wp-1)->type == WORD_TYPE_macro))
&& wp->width != 0) /* real word */
{
#ifdef DEBUG_RL
printf(" Move word to next line\n");
#endif
break;
}
/* Update the horizontal offsets. */
x_offset += wp->width;
if (use_white_space
|| wp->type == WORD_TYPE_solid
|| wp->type == WORD_TYPE_macro)
{
solid_x_offset = x_offset;
}
if (wp->ascend > lp->ascend)
{
#ifdef DEBUG_RL
printf("Expand ascend from %ld to %ld\n", lp->ascend, wp->ascend);
#endif
baseline -= lp->ascend;
baseline += (lp->ascend = wp->ascend);
#ifdef DEBUG_RL
printf("Baseline moves to %ld\n", baseline);
#endif
}
if (wp->descend > lp->descend)
{
#ifdef DEBUG_RL
printf("Expand descend from %ld to %ld\n", lp->descend, wp->descend);
#endif
lp->descend = wp->descend;
}
if (wp->line_spacing > lp->line_spacing)
{
lp->line_spacing = wp->line_spacing;
}
/* Add this word to the line. */
lp->w_end = w_index++;
#ifdef DEBUG_RL
printf(" Add word to line (x:%ld, w:%ld).\n", x_offset-wp->width, wp->width);
#endif
/* If we just placed a break word, this line is done. */
if (wp++->type == WORD_TYPE_break)
{
/*
// If the previous word:
// (a) was a "macro" word,
// (b) started at the beginning of the line, and
// (c) had zero width,
// don't flow the break to the next line.
*/
BOOL fBreak = TRUE;
if (w_index >= 2 && x_offset == 0)
{
TEXT_WORD_PTR wprev = wp-2;
/* I make an assumption - x_offset == 0 --> width == 0. */
// if (wprev->width == 0)
{
if (*(paragraph->get_character(wprev->c_start)) >= MACRO_CHARACTER)
{
fBreak = FALSE;
}
}
}
if (fBreak)
{
#ifdef DEBUG_RL
printf("(Breaking on BREAK word)\n");
#endif
/* We need to break for this line. */
break;
}
}
}
#ifdef DEBUG_RL
printf("[ line %d base:%ld, asc:%ld, dsc:%ld, w: %d to %d ]\n",
l_index,
baseline, lp->ascend, lp->descend,
lp->w_start, lp->w_end);
#endif
/*
// We now know all the words in this line. Handle the placement.
*/
/* First calculate the alignment offset. */
if ((x_offset = extent - solid_x_offset) > 0)
{
/* Some space to distribute. */
switch (style.get_line_alignment())
{
case ALIGN_center:
{
x_offset /= 2;
break;
}
case ALIGN_left:
{
x_offset = 0;
break;
}
default:
{
break;
}
}
}
else
{
x_offset = 0;
}
/* Now set the positions of the words in this line. */
line_changed = FALSE; /* Cross your fingers. */
x_offset += style.get_left_margin();
{
W_INDEX w_index = lp->w_start, w_end = lp->w_end;
TEXT_WORD_PTR wp = paragraph->get_word(w_index);
/* Redisplay variables */
TEXT_WORD_PTR first_word_change = NULL;
TEXT_WORD_PTR last_word_change = NULL;
PCOORD erase_xmin, erase_xmax;
BOOL found_erase = FALSE;
lp->refresh_xmin = 0x7fffffff;
lp->refresh_xmax = -lp->refresh_xmin;
while (w_index <= w_end)
{
if (x_offset != wp->x_offset || (wp->flags & WORD_FLAG_changed_size))
{
/* A word moved. */
#ifdef DEBUG_RL
printf("word %d changed from %ld to %ld\n",
w_index, wp->x_offset, x_offset);
#endif
if (first_word_change == NULL)
{
first_word_change = wp;
}
if (!found_erase && wp->x_offset != -1 &&
w_index >= old_line.w_start && w_index <= old_line.w_end)
{
erase_xmin = wp->x_offset + wp->draw_left;
erase_xmax = wp->x_offset + wp->draw_width;
found_erase = TRUE;
}
last_word_change = wp;
if (wp->x_offset != -1 &&
w_index >= old_line.w_start && w_index <= old_line.w_end)
{
erase_xmin = __min(erase_xmin, wp->x_offset + wp->draw_left);
erase_xmax = __max(erase_xmax, wp->x_offset + wp->draw_width);
}
wp->x_offset = x_offset;
//remove this to do word-wise refresh; restore it to do full line refresh
// line_changed = TRUE;
}
wp->flags &= ~WORD_FLAG_changed_size;
lp->refresh_xmin = __min(lp->refresh_xmin, wp->x_offset + wp->draw_left);
lp->refresh_xmax = __max(lp->refresh_xmax, wp->x_offset + wp->draw_width);
x_offset += wp++->width;
w_index++;
}
if (first_word_change != NULL && old_line.baseline != -1)
{
/* Add a DRAW for every word that moved; erase moved words from
their old positions. */
add_words_refresh_extent(frame, &old_line,
first_word_change, last_word_change, REFRESH_DRAW);
if (found_erase)
{
add_width_refresh_extent(frame, &old_line,
erase_xmin, erase_xmax, REFRESH_ERASE);
}
}
}
/* See if the line changed. */
if (!line_changed)
{
/* Words stayed the same. See if the line is different somehow. */
/* Compare using the OLD_LINE structure. This allows us to ignore
the changes in refresh_xmin, refresh_xmax. */
line_changed = (memcmp(&old_line, lp, sizeof(OLD_LINE)) != 0);
if (line_changed)
{
lp->baseline = -1;
}
}
if (line_changed)
{
#ifdef DEBUG_RL
printf("Line %d changed\n", l_index);
printf("old [%d to %d] vs. new [%d to %d]\n",
old_line.w_start, old_line.w_end,
lp->w_start, lp->w_end);
#endif
if (old_line.baseline != -1)
{
add_line_refresh_extent(frame, &old_line);
}
}
else
{
#ifdef DEBUG_RL
printf("Line %d stayed the same\n", l_index);
#endif
/* We can end now! */
if (w_index > wrange.w_end)
{
break;
}
}
/* See if we're done. */
if (w_index >= word_count)
{
/* Run out of words. Finished. */
break;
}
/*
// Move to a new line.
// Add one if there are no more left.
*/
line_top = baseline + lp->descend;
if (++l_index == frame->number_of_lines())
{
/* Create a new dummy line. */
LINE line;
#ifdef DEBUG_RL
printf("(Create a new line)\n");
#endif
line.w_start = line.w_end = 0; /* In case. */
line.baseline = -1;
frame->insert_line(l_index, &line);
lp = frame->get_line(l_index);
}
else
{
/* Add a refresh extent for the old line in case it's changing. */
#ifdef DEBUG_RL
printf("(Move onto existing line)\n");
#endif
lp++;
}
}
#ifdef DEBUG_RL
printf("Done (final l_index:%d, w_index:%d)...\n", l_index, w_index);
#endif
/* If we flowed all words, delete any trailing lines. */
if (w_index == word_count)
{
if (++l_index < frame->number_of_lines())
{
while (l_index < frame->number_of_lines())
{
#ifdef DEBUG_RL
printf("{Delete line}");
#endif
add_line_refresh_extent(frame, frame->get_line(l_index));
frame->delete_line(l_index);
}
#ifdef DEBUG_RL
printf("\n");
#endif
}
}
if (frame_flags & FRAME_FLAG_ystretch_frame)
{
position_lines(frame, style.get_vertical_alignment());
object->ystretch_frame();
}
position_lines(frame, style.get_vertical_alignment());
/*
// Release our objects.
*/
paragraph->release(TRUE);
frame->release(TRUE);
return ERRORCODE_None;
}