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/*
* Copyright 2006 John-Mark Bell <jmb@netsurf-browser.org>
* Copyright 2009 Paul Blokus <paul_pl@users.sourceforge.net>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file
* Single/Multi-line UTF-8 text area (implementation)
*/
#include <stdint.h>
#include <string.h>
#include "css/css.h"
#include "css/utils.h"
#include "desktop/mouse.h"
#include "desktop/textarea.h"
#include "desktop/textinput.h"
#include "desktop/plotters.h"
#include "render/font.h"
#include "utils/log.h"
#include "utils/utf8.h"
#include "utils/utils.h"
#define MARGIN_LEFT 4
#define MARGIN_RIGHT 4
#define CARET_COLOR 0x0000FF
/* background color for readonly textarea */
#define READONLY_BG 0xD9D9D9
#define BACKGROUND_COL 0xFFFFFF
#define BORDER_COLOR 0x000000
#define SELECTION_COL 0xFFDDDD
static plot_style_t pstyle_fill_selection = {
.fill_type = PLOT_OP_TYPE_SOLID,
.fill_colour = SELECTION_COL,
};
static plot_style_t pstyle_stroke_border = {
.stroke_type = PLOT_OP_TYPE_SOLID,
.stroke_colour = BORDER_COLOR,
.stroke_width = 1,
};
static plot_style_t pstyle_stroke_caret = {
.stroke_type = PLOT_OP_TYPE_SOLID,
.stroke_colour = CARET_COLOR,
.stroke_width = 1,
};
struct line_info {
unsigned int b_start; /**< Byte offset of line start */
unsigned int b_length; /**< Byte length of line */
};
struct text_area {
int scroll_x, scroll_y; /**< scroll offsets of the textarea
* content
*/
unsigned int flags; /**< Textarea flags */
int vis_width; /**< Visible width, in pixels */
int vis_height; /**< Visible height, in pixels */
char *text; /**< UTF-8 text */
unsigned int text_alloc; /**< Size of allocated text */
unsigned int text_len; /**< Length of text, in bytes */
unsigned int text_utf8_len; /**< Length of text, in characters
* without the trailing NUL
*/
struct {
int line; /**< Line caret is on */
int char_off; /**< Character index of caret within the
* specified line
*/
} caret_pos;
int caret_x; /**< cached X coordinate of the caret */
int caret_y; /**< cached Y coordinate of the caret */
int selection_start; /**< Character index of sel start(inclusive) */
int selection_end; /**< Character index of sel end(exclusive) */
plot_font_style_t fstyle; /**< Text style */
int line_count; /**< Count of lines */
#define LINE_CHUNK_SIZE 16
struct line_info *lines; /**< Line info array */
int line_height; /**< Line height obtained from style */
/** Callback function for a redraw request */
textarea_redraw_request_callback redraw_request;
void *data; /** < Callback data for both callback functions */
int drag_start_char; /**< Character index at which the drag was
* started
*/
};
static bool textarea_insert_text(struct text_area *ta, unsigned int index,
const char *text);
static bool textarea_replace_text(struct text_area *ta, unsigned int start,
unsigned int end, const char *text);
static bool textarea_reflow(struct text_area *ta, unsigned int line);
static unsigned int textarea_get_xy_offset(struct text_area *ta, int x, int y);
static bool textarea_set_caret_xy(struct text_area *ta, int x, int y);
static bool textarea_scroll_visible(struct text_area *ta);
static bool textarea_select(struct text_area *ta, int c_start, int c_end);
static void textarea_normalise_text(struct text_area *ta,
unsigned int b_start, unsigned int b_len);
/**
* Create a text area
*
* \param x X coordinate of left border
* \param y Y coordinate of top border
* \param width width of the text area
* \param height width of the text area
* \param flags text area flags
* \param style font style
* \param redraw_start_callback will be called when textarea wants to redraw
* \param redraw_end_callback will be called when textarea finisjes redrawing
* \param data user specified data which will be passed to redraw callbacks
* \return Opaque handle for textarea or 0 on error
*/
struct text_area *textarea_create(int width, int height,
unsigned int flags, const plot_font_style_t *style,
textarea_redraw_request_callback redraw_request, void *data)
{
struct text_area *ret;
if (redraw_request == NULL) {
LOG(("no callback provided"));
return NULL;
}
ret = malloc(sizeof(struct text_area));
if (ret == NULL) {
LOG(("malloc failed"));
return NULL;
}
ret->redraw_request = redraw_request;
ret->data = data;
ret->vis_width = width;
ret->vis_height = height;
ret->scroll_x = 0;
ret->scroll_y = 0;
ret->drag_start_char = 0;
ret->flags = flags;
ret->text = malloc(64);
if (ret->text == NULL) {
LOG(("malloc failed"));
free(ret);
return NULL;
}
ret->text[0] = '\0';
ret->text_alloc = 64;
ret->text_len = 1;
ret->text_utf8_len = 0;
ret->fstyle = *style;
ret->line_height = FIXTOINT(FDIV((FMUL(FLTTOFIX(1.2), FMUL(nscss_screen_dpi, INTTOFIX((style->size / FONT_SIZE_SCALE))))), F_72));
ret->caret_pos.line = ret->caret_pos.char_off = 0;
ret->caret_x = MARGIN_LEFT;
ret->caret_y = 0;
ret->selection_start = -1;
ret->selection_end = -1;
ret->line_count = 0;
ret->lines = NULL;
return ret;
}
/**
* Destroy a text area
*
* \param ta Text area to destroy
*/
void textarea_destroy(struct text_area *ta)
{
free(ta->text);
free(ta->lines);
free(ta);
}
/**
* Set the text in a text area, discarding any current text
*
* \param ta Text area
* \param text UTF-8 text to set text area's contents to
* \return true on success, false on memory exhaustion
*/
bool textarea_set_text(struct text_area *ta, const char *text)
{
unsigned int len = strlen(text) + 1;
if (len >= ta->text_alloc) {
char *temp = realloc(ta->text, len + 64);
if (temp == NULL) {
LOG(("realloc failed"));
return false;
}
ta->text = temp;
ta->text_alloc = len + 64;
}
memcpy(ta->text, text, len);
ta->text_len = len;
ta->text_utf8_len = utf8_length(ta->text);
textarea_normalise_text(ta, 0, len);
return textarea_reflow(ta, 0);
}
/**
* Extract the text from a text area
*
* \param ta Text area
* \param buf Pointer to buffer to receive data, or NULL
* to read length required
* \param len Length (bytes) of buffer pointed to by buf, or 0 to read length
* \return Length (bytes) written/required or -1 on error
*/
int textarea_get_text(struct text_area *ta, char *buf, unsigned int len)
{
if (buf == NULL && len == 0) {
/* want length */
return ta->text_len;
} else if (buf == NULL) {
/* Can't write to NULL */
return -1;
}
if (len < ta->text_len) {
LOG(("buffer too small"));
return -1;
}
memcpy(buf, ta->text, ta->text_len);
return ta->text_len;
}
/**
* Insert text into the text area
*
* \param ta Text area
* \param index 0-based character index to insert at
* \param text UTF-8 text to insert
* \return false on memory exhaustion, true otherwise
*/
bool textarea_insert_text(struct text_area *ta, unsigned int index,
const char *text)
{
unsigned int b_len = strlen(text);
size_t b_off;
if (ta->flags & TEXTAREA_READONLY)
return true;
/* Find insertion point */
if (index > ta->text_utf8_len)
index = ta->text_utf8_len;
/* find byte offset of insertion point */
for (b_off = 0; index-- > 0;
b_off = utf8_next(ta->text, ta->text_len, b_off))
; /* do nothing */
if (b_len + ta->text_len >= ta->text_alloc) {
char *temp = realloc(ta->text, b_len + ta->text_len + 64);
if (temp == NULL) {
LOG(("realloc failed"));
return false;
}
ta->text = temp;
ta->text_alloc = b_len + ta->text_len + 64;
}
/* Shift text following up */
memmove(ta->text + b_off + b_len, ta->text + b_off,
ta->text_len - b_off);
/* Insert new text */
memcpy(ta->text + b_off, text, b_len);
ta->text_len += b_len;
ta->text_utf8_len += utf8_length(text);
textarea_normalise_text(ta, b_off, b_len);
/** \todo calculate line to reflow from */
return textarea_reflow(ta, 0);
}
/**
* Replace text in a text area
*
* \param ta Text area
* \param start Start character index of replaced section (inclusive)
* \param end End character index of replaced section (exclusive)
* \param text UTF-8 text to insert
* \return false on memory exhaustion, true otherwise
*/
bool textarea_replace_text(struct text_area *ta, unsigned int start,
unsigned int end, const char *text)
{
unsigned int b_len = strlen(text);
size_t b_start, b_end, diff;
if (ta->flags & TEXTAREA_READONLY)
return true;
if (start > ta->text_utf8_len)
start = ta->text_utf8_len;
if (end > ta->text_utf8_len)
end = ta->text_utf8_len;
if (start == end)
return textarea_insert_text(ta, start, text);
if (start > end)
return false;
diff = end - start;
/* find byte offset of replace start */
for (b_start = 0; start-- > 0;
b_start = utf8_next(ta->text, ta->text_len, b_start))
; /* do nothing */
/* find byte length of replaced text */
for (b_end = b_start; diff-- > 0;
b_end = utf8_next(ta->text, ta->text_len, b_end))
; /* do nothing */
if (b_len + ta->text_len - (b_end - b_start) >= ta->text_alloc) {
char *temp = realloc(ta->text,
b_len + ta->text_len - (b_end - b_start) + 64);
if (temp == NULL) {
LOG(("realloc failed"));
return false;
}
ta->text = temp;
ta->text_alloc =
b_len + ta->text_len - (b_end - b_start) + 64;
}
/* Shift text following to new position */
memmove(ta->text + b_start + b_len, ta->text + b_end,
ta->text_len - b_end);
/* Insert new text */
memcpy(ta->text + b_start, text, b_len);
ta->text_len += b_len - (b_end - b_start);
ta->text_utf8_len = utf8_length(ta->text);
textarea_normalise_text(ta, b_start, b_len);
/** \todo calculate line to reflow from */
return textarea_reflow(ta, 0);
}
/**
* Set the caret's position
*
* \param ta Text area
* \param caret 0-based character index to place caret at, -1 removes
* the caret
* \return true on success false otherwise
*/
bool textarea_set_caret(struct text_area *ta, int caret)
{
unsigned int c_len;
unsigned int b_off;
int i;
int index;
int x, y;
int x0, y0, x1, y1;
int text_y_offset;
if (ta->flags & TEXTAREA_READONLY)
return true;
c_len = ta->text_utf8_len;
if (caret != -1 && (unsigned)caret > c_len)
caret = c_len;
if (ta->flags & TEXTAREA_MULTILINE) {
/* Multiline textarea */
text_y_offset = 0;
} else {
/* Single line text area; text is vertically centered */
text_y_offset = (ta->vis_height - ta->line_height + 1) / 2;
}
/* Delete the old caret */
if (ta->caret_pos.char_off != -1) {
index = textarea_get_caret(ta);
if (index == -1)
return false;
/* the redraw might happen in response to a text-change and
the caret position might be beyond the current text */
if ((unsigned)index > c_len)
index = c_len;
/* find byte offset of caret position */
for (b_off = 0; index-- > 0;
b_off = utf8_next(ta->text,
ta->text_len, b_off))
; /* do nothing */
nsfont.font_width(&ta->fstyle,
ta->text +
ta->lines[ta->caret_pos.line].b_start,
b_off - ta->lines[ta->caret_pos.line].b_start,
&x);
x += MARGIN_LEFT - ta->scroll_x;
y = ta->line_height * ta->caret_pos.line - ta->scroll_y;
/* set the caret coordinate beyond the redraw rectangle */
ta->caret_x = x - 2;
ta->redraw_request(ta->data, x - 1, y + text_y_offset, x + 1,
y + ta->line_height + text_y_offset);
}
/* check if the caret has to be drawn at all */
if (caret != -1) {
/* Find byte offset of caret position */
for (b_off = 0; caret > 0; caret--)
b_off = utf8_next(ta->text, ta->text_len, b_off);
/* Now find line in which byte offset appears */
for (i = 0; i < ta->line_count - 1; i++)
if (ta->lines[i + 1].b_start > b_off)
break;
ta->caret_pos.line = i;
/* Now calculate the char. offset of the caret in this line */
for (c_len = 0, ta->caret_pos.char_off = 0;
c_len < b_off - ta->lines[i].b_start;
c_len = utf8_next(ta->text +
ta->lines[i].b_start,
ta->lines[i].b_length, c_len))
ta->caret_pos.char_off++;
/* Finally, redraw the caret */
index = textarea_get_caret(ta);
if (index == -1)
return false;
/* find byte offset of caret position */
for (b_off = 0; index-- > 0;
b_off = utf8_next(ta->text,
ta->text_len, b_off))
; /* do nothing */
nsfont.font_width(&ta->fstyle,
ta->text +
ta->lines[ta->caret_pos.line].b_start,
b_off - ta->lines[ta->caret_pos.line].b_start,
&x);
x += MARGIN_LEFT - ta->scroll_x;
ta->caret_x = x;
y = ta->line_height * ta->caret_pos.line - ta->scroll_y;
ta->caret_y = y;
if (textarea_scroll_visible(ta))
ta->redraw_request(ta->data, 0, 0,
ta->vis_width,
ta->vis_height);
else {
x0 = max(x - 1, MARGIN_LEFT);
y0 = max(y + text_y_offset, 0);
x1 = min(x + 1, ta->vis_width - MARGIN_RIGHT);
y1 = min(y + ta->line_height + text_y_offset, ta->vis_height);
ta->redraw_request(ta->data, x0, y0, x1, y1);
}
}
return true;
}
/**
* get character offset from the beginning of the text for some coordinates
*
* \param ta Text area
* \param x X coordinate
* \param y Y coordinate
* \return character offset
*/
unsigned int textarea_get_xy_offset(struct text_area *ta, int x, int y)
{
size_t b_off, temp;
unsigned int c_off;
int line;
if (!ta->line_count)
return 0;
x = x - MARGIN_LEFT + ta->scroll_x;
y = y + ta->scroll_y;
if (x < 0)
x = 0;
line = y / ta->line_height;
if (line < 0)
line = 0;
if (ta->line_count - 1 < line)
line = ta->line_count - 1;
nsfont.font_position_in_string(&ta->fstyle,
ta->text + ta->lines[line].b_start,
ta->lines[line].b_length, x, &b_off, &x);
/* If the calculated byte offset corresponds with the number of bytes
* in the line, and the line has been soft-wrapped, then ensure the
* caret offset is before the trailing space character, rather than
* after it. Otherwise, the caret will be placed at the start of the
* following line, which is undesirable.
*/
if (b_off == (unsigned)ta->lines[line].b_length &&
ta->text[ta->lines[line].b_start +
ta->lines[line].b_length - 1] == ' ')
b_off--;
for (temp = 0, c_off = 0; temp < b_off + ta->lines[line].b_start;
temp = utf8_next(ta->text, ta->text_len, temp))
c_off++;
return c_off;
}
/**
* Set the caret's position
*
* \param ta Text area
* \param x X position of caret in a window relative to text area top left
* \param y Y position of caret in a window relative to text area top left
* \return true on success false otherwise
*/
bool textarea_set_caret_xy(struct text_area *ta, int x, int y)
{
unsigned int c_off;
if (ta->flags & TEXTAREA_READONLY)
return true;
c_off = textarea_get_xy_offset(ta, x, y);
return textarea_set_caret(ta, c_off);
}
/**
* Get the caret's position
*
* \param ta Text area
* \return 0-based character index of caret location, or -1 on error
*/
int textarea_get_caret(struct text_area *ta)
{
unsigned int c_off = 0, b_off;
/* if the text is a trailing NUL only */
if (ta->text_utf8_len == 0)
return 0;
/* Calculate character offset of this line's start */
for (b_off = 0; b_off < ta->lines[ta->caret_pos.line].b_start;
b_off = utf8_next(ta->text, ta->text_len, b_off))
c_off++;
return c_off + ta->caret_pos.char_off;
}
/**
* Reflow a text area from the given line onwards
*
* \param ta Text area to reflow
* \param line Line number to begin reflow on
* \return true on success false otherwise
*/
bool textarea_reflow(struct text_area *ta, unsigned int line)
{
char *text;
unsigned int len;
size_t b_off;
int x;
char *space;
unsigned int line_count = 0;
/** \todo pay attention to line parameter */
/** \todo create horizontal scrollbar if needed */
ta->line_count = 0;
if (ta->lines == NULL) {
ta->lines =
malloc(LINE_CHUNK_SIZE * sizeof(struct line_info));
if (ta->lines == NULL) {
LOG(("malloc failed"));
return false;
}
}
if (!(ta->flags & TEXTAREA_MULTILINE)) {
/* Single line */
ta->lines[line_count].b_start = 0;
ta->lines[line_count++].b_length = ta->text_len - 1;
ta->line_count = line_count;
return true;
}
for (len = ta->text_len - 1, text = ta->text; len > 0;
len -= b_off, text += b_off) {
nsfont.font_split(&ta->fstyle, text, len,
ta->vis_width - MARGIN_LEFT - MARGIN_RIGHT,
&b_off, &x);
if (line_count > 0 && line_count % LINE_CHUNK_SIZE == 0) {
struct line_info *temp = realloc(ta->lines,
(line_count + LINE_CHUNK_SIZE) *
sizeof(struct line_info));
if (temp == NULL) {
LOG(("realloc failed"));
return false;
}
ta->lines = temp;
}
/* handle LF */
for (space = text; space <= text + b_off; space++) {
if (*space == '\n')
break;
}
if (space <= text + b_off) {
/* Found newline; use it */
ta->lines[line_count].b_start = text - ta->text;
ta->lines[line_count++].b_length = space - text;
b_off = space + 1 - text;
if (len - b_off == 0) {
/* reached end of input => add last line */
ta->lines[line_count].b_start =
text + b_off - ta->text;
ta->lines[line_count++].b_length = 0;
}
continue;
}
if (len - b_off > 0) {
/* find last space (if any) */
for (space = text + b_off; space > text; space--)
if (*space == ' ')
break;
if (space != text)
b_off = space + 1 - text;
}
ta->lines[line_count].b_start = text - ta->text;
ta->lines[line_count++].b_length = b_off;
}
ta->line_count = line_count;
return true;
}
/**
* Handle redraw requests for text areas
*
* \param redraw Redraw request block
* \param x0 left X coordinate of redraw area
* \param y0 top Y coordinate of redraw area
* \param x1 right X coordinate of redraw area
* \param y1 bottom Y coordinate of redraw area
* \param ctx current redraw context
*/
void textarea_redraw(struct text_area *ta, int x, int y,
const struct rect *clip, const struct redraw_context *ctx)
{
const struct plotter_table *plot = ctx->plot;
int line0, line1, line;
int chars, offset, text_y_offset, text_y_offset_baseline;
unsigned int c_pos, c_len, b_start, b_end, line_len;
char *line_text;
struct rect r;
plot_style_t plot_style_fill_bg = {
.fill_type = PLOT_OP_TYPE_SOLID,
.fill_colour = BACKGROUND_COL,
};
r = *clip;
if (r.x1 < x || r.x0 > x + ta->vis_width || r.y1 < y ||
r.y0 > y + ta->vis_height)
/* Textarea outside the clipping rectangle */
return;
if (ta->lines == NULL)
/* Nothing to redraw */
return;
if (ta->flags & TEXTAREA_READONLY)
plot_style_fill_bg.fill_colour = READONLY_BG;
line0 = (r.y0 - y + ta->scroll_y) / ta->line_height - 1;
line1 = (r.y1 - y + ta->scroll_y) / ta->line_height + 1;
if (line0 < 0)
line0 = 0;
if (line1 < 0)
line1 = 0;
if (ta->line_count - 1 < line0)
line0 = ta->line_count - 1;
if (ta->line_count - 1 < line1)
line1 = ta->line_count - 1;
if (line1 < line0)
line1 = line0;
if (r.x0 < x)
r.x0 = x;
if (r.y0 < y)
r.y0 = y;
if (r.x1 > x + ta->vis_width)
r.x1 = x + ta->vis_width;
if (r.y1 > y + ta->vis_height)
r.y1 = y + ta->vis_height;
plot->clip(&r);
plot->rectangle(r.x0, r.y0, r.x1, r.y1, &plot_style_fill_bg);
plot->rectangle(x, y,
x + ta->vis_width - 1, y + ta->vis_height - 1,
&pstyle_stroke_border);
if (r.x0 < x + MARGIN_LEFT)
r.x0 = x + MARGIN_LEFT;
if (r.x1 > x + ta->vis_width - MARGIN_RIGHT)
r.x1 = x + ta->vis_width - MARGIN_RIGHT;
plot->clip(&r);
if (line0 > 0)
c_pos = utf8_bounded_length(ta->text,
ta->lines[line0].b_start - 1);
else
c_pos = 0;
if (ta->flags & TEXTAREA_MULTILINE) {
/* Multiline textarea */
text_y_offset = 0;
text_y_offset_baseline = (ta->line_height * 3 + 2) / 4;
} else {
/* Single line text area; text is vertically centered */
text_y_offset = (ta->vis_height - ta->line_height + 1) / 2;
text_y_offset_baseline = (ta->vis_height * 3 + 2) / 4;
}
for (line = line0; (line <= line1) &&
(y + line * ta->line_height <= r.y1 + ta->scroll_y);
line++) {
if (ta->lines[line].b_length == 0)
continue;
c_len = utf8_bounded_length(
&(ta->text[ta->lines[line].b_start]),
ta->lines[line].b_length);
/* if there is a newline between the lines count it too */
if (line < ta->line_count - 1 && ta->lines[line + 1].b_start !=
ta->lines[line].b_start +
ta->lines[line].b_length)
c_len++;
/* check if a part of the line is selected, won't happen if no
selection (ta->selection_end = -1) */
if (ta->selection_end != -1 &&
c_pos < (unsigned)ta->selection_end &&
c_pos + c_len > (unsigned)ta->selection_start) {
/* offset from the beginning of the line */
offset = ta->selection_start - c_pos;
chars = ta->selection_end - c_pos -
(offset > 0 ? offset:0);
line_text = &(ta->text[ta->lines[line].b_start]);
line_len = ta->lines[line].b_length;
if (offset > 0) {
/* find byte start of the selected part */
for (b_start = 0; offset > 0; offset--)
b_start = utf8_next(line_text,
line_len,
b_start);
nsfont.font_width(&ta->fstyle, line_text,
b_start, &r.x0);
r.x0 += x + MARGIN_LEFT;
}
else {
r.x0 = x + MARGIN_LEFT;
b_start = 0;
}
if (chars >= 0) {
/* find byte end of the selected part */
for (b_end = b_start; chars > 0 &&
b_end < line_len;
chars--) {
b_end = utf8_next(line_text, line_len,
b_end);
}
}
else
b_end = ta->lines[line].b_length;
b_end -= b_start;
nsfont.font_width(&ta->fstyle,
&(ta->text[ta->lines[line].b_start +
b_start]),
b_end, &r.x1);
r.x1 += r.x0;
plot->rectangle(r.x0 - ta->scroll_x, y +
line * ta->line_height +
1 - ta->scroll_y + text_y_offset,
r.x1 - ta->scroll_x,
y + (line + 1) * ta->line_height -
1 - ta->scroll_y + text_y_offset,
&pstyle_fill_selection);
}
c_pos += c_len;
r.y0 = y + line * ta->line_height + text_y_offset_baseline;
ta->fstyle.background =
(ta->flags & TEXTAREA_READONLY) ?
READONLY_BG : BACKGROUND_COL,
plot->text(x + MARGIN_LEFT - ta->scroll_x,
r.y0 - ta->scroll_y,
ta->text + ta->lines[line].b_start,
ta->lines[line].b_length,
&ta->fstyle);
}
if ((ta->selection_end == -1 ||
ta->selection_start == ta->selection_end) &&
x + ta->caret_x >= clip->x0 &&
x + ta->caret_x <= clip->x1) {
/* There is no selection and caret is in horizontal
* clip range. */
int caret_height = ta->line_height - 1;
y += ta->caret_y + text_y_offset;
if (y + caret_height >= clip->y0 && y <= clip->y1)
/* Caret in vertical clip range; plot */
plot->line(x + ta->caret_x, y + ta->caret_y,
x + ta->caret_x,
y + ta->caret_y + ta->line_height,
&pstyle_stroke_caret);
}
}
/**
* Key press handling for text areas.
*
* \param ta The text area which got the keypress
* \param key The ucs4 character codepoint
* \return true if the keypress is dealt with, false otherwise.
*/
bool textarea_keypress(struct text_area *ta, uint32_t key)
{
char utf8[6];
unsigned int caret, caret_init, length, l_len, b_off, b_len;
int c_line, c_chars, line;
bool redraw = false;
bool readonly;
caret_init = caret = textarea_get_caret(ta);
line = ta->caret_pos.line;
readonly = (ta->flags & TEXTAREA_READONLY ? true:false);
if (!(key <= 0x001F || (0x007F <= key && key <= 0x009F))) {
/* normal character insertion */
length = utf8_from_ucs4(key, utf8);
utf8[length] = '\0';
if (!textarea_insert_text(ta, caret, utf8))
return false;
caret++;
redraw = true;
} else switch (key) {
case KEY_SELECT_ALL:
caret = ta->text_utf8_len;
ta->selection_start = 0;
ta->selection_end = ta->text_utf8_len;
redraw = true;
break;
case KEY_COPY_SELECTION:
break;
case KEY_DELETE_LEFT:
if (readonly)
break;
if (ta->selection_start != -1) {
if (!textarea_replace_text(ta,
ta->selection_start,
ta->selection_end, ""))
return false;
ta->selection_start = ta->selection_end = -1;
redraw = true;
} else {
if (caret) {
if (!textarea_replace_text(ta,
caret - 1,
caret, ""))
return false;
caret--;
redraw = true;
}
}
break;
break;
case KEY_NL:
if (readonly)
break;
if(!textarea_insert_text(ta, caret, "\n"))
return false;
caret++;
ta->selection_start = ta->selection_end = -1;
redraw = true;
break;
case KEY_CUT_LINE:
case KEY_PASTE:
case KEY_CUT_SELECTION:
break;
case KEY_ESCAPE:
case KEY_CLEAR_SELECTION:
ta->selection_start = -1;
ta->selection_end = -1;
redraw = true;
break;
case KEY_LEFT:
if (readonly)
break;
if (caret)
caret--;
if (ta->selection_start != -1) {
ta->selection_start = ta->selection_end = -1;
redraw = true;
}
break;
case KEY_RIGHT:
if (readonly)
break;
if (caret < ta->text_utf8_len)
caret++;
if (ta->selection_start != -1) {
ta->selection_start = ta->selection_end = -1;
redraw = true;
}
break;
case KEY_PAGE_UP:
if (readonly)
break;
if (ta->flags & TEXTAREA_MULTILINE) {
/* +1 because one line is subtracted in
KEY_UP */
line = ta->caret_pos.line - (ta->vis_height +
ta->line_height - 1) /
ta->line_height
+ 1;
}
/* fall through */
case KEY_UP:
if (readonly)
break;
if (ta->selection_start != -1) {
ta->selection_start = ta->selection_end = -1;
redraw = true;
}
if (ta->flags & TEXTAREA_MULTILINE) {
line--;
if (line < 0)
line = 0;
if (line == ta->caret_pos.line)
break;
b_off = ta->lines[line].b_start;
b_len = ta->lines[line].b_length;
c_line = ta->caret_pos.line;
c_chars = ta->caret_pos.char_off;
if (ta->text[b_off + b_len - 1] == ' '
&& line < ta->line_count - 1)
b_len--;
l_len = utf8_bounded_length(&(ta->text[b_off]),
b_len);
ta->caret_pos.line = line;
ta->caret_pos.char_off = min(l_len,
(unsigned)
ta->caret_pos.char_off);
caret = textarea_get_caret(ta);
ta->caret_pos.line = c_line;
ta->caret_pos.char_off = c_chars;
}
break;
case KEY_PAGE_DOWN:
if (readonly)
break;
if (ta->flags & TEXTAREA_MULTILINE) {
/* -1 because one line is added in KEY_DOWN */
line = ta->caret_pos.line + (ta->vis_height +
ta->line_height - 1) /
ta->line_height
- 1;
}
/* fall through */
case KEY_DOWN:
if (readonly)
break;
if (ta->selection_start != -1) {
ta->selection_start = ta->selection_end = -1;
redraw = true;
}
if (ta->flags & TEXTAREA_MULTILINE) {
line++;
if (line > ta->line_count - 1)
line = ta->line_count - 1;
if (line == ta->caret_pos.line)
break;
b_off = ta->lines[line].b_start;
b_len = ta->lines[line].b_length;
c_line = ta->caret_pos.line;
c_chars = ta->caret_pos.char_off;
if (ta->text[b_off + b_len - 1] == ' '
&& line < ta->line_count - 1)
b_len--;
l_len = utf8_bounded_length(&(ta->text[b_off]),
b_len);
ta->caret_pos.line = line;
ta->caret_pos.char_off = min(l_len,
(unsigned)
ta->caret_pos.char_off);
caret = textarea_get_caret(ta);
ta->caret_pos.line = c_line;
ta->caret_pos.char_off = c_chars;
}
break;
case KEY_DELETE_RIGHT:
if (readonly)
break;
if (ta->selection_start != -1) {
if (!textarea_replace_text(ta,
ta->selection_start,
ta->selection_end, ""))
return false;
ta->selection_start = ta->selection_end = -1;
redraw = true;
} else {
if (caret < ta->text_utf8_len) {
if (!textarea_replace_text(ta, caret,
caret + 1, ""))
return false;
redraw = true;
}
}
break;
case KEY_LINE_START:
if (readonly)
break;
caret -= ta->caret_pos.char_off;
if (ta->selection_start != -1) {
ta->selection_start = ta->selection_end = -1;
redraw = true;
}
break;
case KEY_LINE_END:
if (readonly)
break;
caret = utf8_bounded_length(ta->text,
ta->lines[ta->caret_pos.line].b_start +
ta->lines[ta->caret_pos.line].b_length);
if (ta->text[ta->lines[ta->caret_pos.line].b_start +
ta->lines[ta->caret_pos.line].b_length
- 1] == ' ')
caret--;
if (ta->selection_start != -1) {
ta->selection_start = ta->selection_end = -1;
redraw = true;
}
break;
case KEY_TEXT_START:
if (readonly)
break;
caret = 0;
if (ta->selection_start != -1) {
ta->selection_start = ta->selection_end = -1;
redraw = true;
}
break;
case KEY_TEXT_END:
if (readonly)
break;
caret = ta->text_utf8_len;
if (ta->selection_start != -1) {
ta->selection_start = ta->selection_end = -1;
redraw = true;
}
break;
case KEY_WORD_LEFT:
case KEY_WORD_RIGHT:
break;
case KEY_DELETE_LINE_END:
if (readonly)
break;
if (ta->selection_start != -1) {
if (!textarea_replace_text(ta,
ta->selection_start,
ta->selection_end, ""))
return false;
ta->selection_start = ta->selection_end = -1;
} else {
b_off = ta->lines[ta->caret_pos.line].b_start;
b_len = ta->lines[ta->caret_pos.line].b_length;
l_len = utf8_bounded_length(&(ta->text[b_off]),
b_len);
if (!textarea_replace_text(ta, caret,
caret + l_len, ""))
return false;
}
redraw = true;
break;
case KEY_DELETE_LINE_START:
if (readonly)
break;
if (ta->selection_start != -1) {
if (!textarea_replace_text(ta,
ta->selection_start,
ta->selection_end, ""))
return false;
ta->selection_start = ta->selection_end = -1;
} else {
if (!textarea_replace_text(ta,
caret - ta->caret_pos.char_off,
caret,
""))
return false;
caret -= ta->caret_pos.char_off;
}
redraw = true;
break;
default:
return false;
}
if (caret != caret_init)
textarea_set_caret(ta, caret);
//TODO:redraw only the important part
if (redraw) {
ta->redraw_request(ta->data, 0, 0,
ta->vis_width, ta->vis_height);
}
return true;
}
/**
* Scrolls a textarea to make the caret visible (doesn't perform a redraw)
*
* \param ta The text area to be scrolled
* \return true if textarea was scrolled false otherwise
*/
bool textarea_scroll_visible(struct text_area *ta)
{
int x0, x1, y0, y1, x, y;
int index, b_off;
bool scrolled = false;
if (ta->caret_pos.char_off == -1)
return false;
x0 = MARGIN_LEFT;
x1 = ta->vis_width - MARGIN_RIGHT;
y0 = 0;
y1 = ta->vis_height;
index = textarea_get_caret(ta);
/* find byte offset of caret position */
for (b_off = 0; index-- > 0;
b_off = utf8_next(ta->text, ta->text_len, b_off))
; /* do nothing */
nsfont.font_width(&ta->fstyle,
ta->text + ta->lines[ta->caret_pos.line].b_start,
b_off - ta->lines[ta->caret_pos.line].b_start,
&x);
/* top-left of caret */
x += MARGIN_LEFT - ta->scroll_x;
y = ta->line_height * ta->caret_pos.line - ta->scroll_y;
/* check and change vertical scroll */
if (y < y0) {
ta->scroll_y -= y0 - y;
scrolled = true;
} else if (y + ta->line_height > y1) {
ta->scroll_y += y + ta->line_height - y1;
scrolled = true;
}
/* check and change horizontal scroll */
if (x < x0) {
ta->scroll_x -= x0 - x ;
scrolled = true;
} else if (x > x1 - 1) {
ta->scroll_x += x - (x1 - 1);
scrolled = true;
}
return scrolled;
}
/**
* Handles all kinds of mouse action
*
* \param ta Text area
* \param mouse the mouse state at action moment
* \param x X coordinate
* \param y Y coordinate
* \return true if action was handled false otherwise
*/
bool textarea_mouse_action(struct text_area *ta, browser_mouse_state mouse,
int x, int y)
{
int c_start, c_end;
/* mouse button pressed above the text area, move caret */
if (mouse & BROWSER_MOUSE_PRESS_1) {
if (!(ta->flags & TEXTAREA_READONLY))
textarea_set_caret_xy(ta, x, y);
if (ta->selection_start != -1) {
ta->selection_start = ta->selection_end = -1;
ta->redraw_request(ta->data, 0, 0,
ta->vis_width,
ta->vis_height);
}
}
else if (mouse & BROWSER_MOUSE_DRAG_1) {
ta->drag_start_char = textarea_get_xy_offset(ta, x, y);
if (!(ta->flags & TEXTAREA_READONLY))
return textarea_set_caret(ta, -1);
}
else if (mouse & BROWSER_MOUSE_HOLDING_1) {
c_start = ta->drag_start_char;
c_end = textarea_get_xy_offset(ta, x, y);
return textarea_select(ta, c_start, c_end);
}
return true;
}
/**
* Handles the end of a drag operation
*
* \param ta Text area
* \param mouse the mouse state at drag end moment
* \param x X coordinate
* \param y Y coordinate
* \return true if drag end was handled false otherwise
*/
bool textarea_drag_end(struct text_area *ta, browser_mouse_state mouse,
int x, int y)
{
int c_end;
c_end = textarea_get_xy_offset(ta, x, y);
return textarea_select(ta, ta->drag_start_char, c_end);
}
/**
* Selects a character range in the textarea and redraws it
*
* \param ta Text area
* \param c_start First character (inclusive)
* \param c_end Last character (exclusive)
* \return true on success false otherwise
*/
bool textarea_select(struct text_area *ta, int c_start, int c_end)
{
int swap = -1;
/* if start is after end they get swapped, start won't and end will
be selected this way */
if (c_start > c_end) {
swap = c_start;
c_start = c_end;
c_end = swap;
}
ta->selection_start = c_start;
ta->selection_end = c_end;
if (!(ta->flags & TEXTAREA_READONLY)) {
if (swap == -1)
return textarea_set_caret(ta, c_end);
else
return textarea_set_caret(ta, c_start);
}
ta->redraw_request(ta->data, 0, 0, ta->vis_width, ta->vis_height);
return true;
}
/**
* Normalises any line endings within the text, replacing CRLF or CR with
* LF as necessary. If the textarea is single line, then all linebreaks are
* converted into spaces.
*
* \param ta Text area
* \param b_start Byte offset to start at
* \param b_len Byte length to check
*/
void textarea_normalise_text(struct text_area *ta,
unsigned int b_start, unsigned int b_len)
{
bool multi = (ta->flags & TEXTAREA_MULTILINE) ? true:false;
unsigned int index;
/* Remove CR characters. If it's a CRLF pair delete it ot replace it
* with LF otherwise.
*/
for (index = 0; index < b_len; index++) {
if (ta->text[b_start + index] == '\r') {
if (b_start + index + 1 <= ta->text_len &&
ta->text[b_start + index + 1] == '\n') {
ta->text_len--;
ta->text_utf8_len--;
memmove(ta->text + b_start + index,
ta->text + b_start + index + 1,
ta->text_len - b_start - index);
}
else
ta->text[b_start + index] = '\n';
}
/* Replace newlines with spaces if this is a single line
* textarea.
*/
if (!multi && (ta->text[b_start + index] == '\n'))
ta->text[b_start + index] = ' ';
}
}
/**
* Gets the dimensions of a textarea
*
* \param width if not NULL, gets updated to the width of the textarea
* \param height if not NULL, gets updated to the height of the textarea
*/
void textarea_get_dimensions(struct text_area *ta, int *width, int *height)
{
if (width != NULL)
*width = ta->vis_width;
if (height != NULL)
*height = ta->vis_height;
}
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