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00eb142661
netsurf/desktop/textarea.c
Michael Drake 00eb142661 Increase allocation increment step size.
2013-02-22 16:12:48 +00:00

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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/utils.h"
#include "desktop/mouse.h"
#include "desktop/textarea.h"
#include "desktop/textinput.h"
#include "desktop/plotters.h"
#include "desktop/scrollbar.h"
#include "render/font.h"
#include "utils/log.h"
#include "utils/utf8.h"
#include "utils/utils.h"
#define CARET_COLOR 0x0000FF
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 textarea_drag {
textarea_drag_type type;
union {
struct scrollbar* scrollbar;
} data;
};
struct textarea_utf8 {
char *data; /**< UTF-8 text */
unsigned int alloc; /**< Size of allocated text */
unsigned int len; /**< Length of text, in bytes */
unsigned int utf8_len; /**< Length of text, in characters without
* trailing NULL */
};
struct textarea {
int scroll_x, scroll_y; /**< scroll offsets for the textarea */
struct scrollbar *bar_x; /**< Horizontal scroll. */
struct scrollbar *bar_y; /**< Vertical scroll. */
unsigned int flags; /**< Textarea flags */
int vis_width; /**< Visible width, in pixels */
int vis_height; /**< Visible height, in pixels */
int pad_top; /**< Top padding, inside border, in pixels */
int pad_right; /**< Right padding, inside border, in pixels */
int pad_bottom; /**< Bottom padding, inside border, in pixels */
int pad_left; /**< Left padding, inside border, in pixels */
int border_width; /**< Border width, in pixels */
colour border_col; /**< Border colour */
int text_y_offset; /**< Vertical dist to 1st line top */
int text_y_offset_baseline; /**< Vertical dist to 1st baseline */
plot_font_style_t fstyle; /**< Text style, inc. textarea bg col */
plot_font_style_t sel_fstyle; /**< Selected text style */
int line_height; /**< Line height obtained from style */
struct textarea_utf8 text; /**< Textarea text content */
#define PASSWORD_REPLACEMENT "\xe2\x80\xa2"
struct textarea_utf8 password; /**< Text for obscured display */
struct textarea_utf8 *show; /**< Points at .text or .password */
struct {
int line; /**< Line caret is on */
int char_off; /**< Character index of caret on line */
} caret_pos;
int caret_x; /**< cached X coordinate of the caret */
int caret_y; /**< cached Y coordinate of the caret */
int sel_start; /**< Character index of sel start (inclusive) */
int sel_end; /**< Character index of sel end (exclusive) */
int h_extent; /**< Width of content in px */
int v_extent; /**< Height of content in px */
int line_count; /**< Count of lines */
#define LINE_CHUNK_SIZE 32
struct line_info *lines; /**< Line info array */
unsigned int lines_alloc_size; /**< Number of LINE_CHUNK_SIZEs */
/** Callback function for messages to client */
textarea_client_callback callback;
void *data; /**< Client data for callback */
int drag_start_char; /**< Character index of drag start */
struct textarea_drag drag_info; /**< Drag information */
};
/**
* 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
*/
static void textarea_normalise_text(struct textarea *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 the CR, or replace
* CR with LF otherwise.
*/
for (index = 0; index < b_len; index++) {
if (ta->text.data[b_start + index] == '\r') {
if (b_start + index + 1 <= ta->text.len &&
ta->text.data[b_start + index + 1] ==
'\n') {
ta->text.len--;
ta->text.utf8_len--;
memmove(ta->text.data + b_start + index,
ta->text.data + b_start +
index + 1,
ta->text.len - b_start - index);
}
else
ta->text.data[b_start + index] = '\n';
}
/* Replace newlines with spaces if this is a single line
* textarea.
*/
if (!multi && (ta->text.data[b_start + index] == '\n'))
ta->text.data[b_start + index] = ' ';
}
}
/**
* 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)
* \parm force_redraw Redraw whether selection changed or not
* \return true on success false otherwise
*/
static bool textarea_select(struct textarea *ta, int c_start, int c_end,
bool force_redraw)
{
int swap;
bool pre_existing_selection = (ta->sel_start != -1);
struct textarea_msg msg;
if (c_start == c_end) {
textarea_clear_selection(ta);
return true;
}
/* Ensure start is the beginning of the selection */
if (c_start > c_end) {
swap = c_start;
c_start = c_end;
c_end = swap;
}
if (ta->sel_start == c_start && ta->sel_end == c_end &&
!force_redraw)
return true;
ta->sel_start = c_start;
ta->sel_end = c_end;
msg.ta = ta;
msg.type = TEXTAREA_MSG_REDRAW_REQUEST;
msg.data.redraw.x0 = 0;
msg.data.redraw.y0 = 0;
msg.data.redraw.x1 = ta->vis_width;
msg.data.redraw.y1 = ta->vis_height;
ta->callback(ta->data, &msg);
if (!pre_existing_selection && ta->sel_start != -1) {
/* Didn't have a selection before, but do now */
msg.type = TEXTAREA_MSG_SELECTION_REPORT;
msg.data.selection.have_selection = true;
msg.data.selection.read_only = (ta->flags & TEXTAREA_READONLY);
ta->callback(ta->data, &msg);
if (!(ta->flags & TEXTAREA_INTERNAL_CARET)) {
/* Caret hidden, and client is responsible */
msg.type = TEXTAREA_MSG_CARET_UPDATE;
msg.data.caret.type = TEXTAREA_CARET_HIDE;
ta->callback(ta->data, &msg);
}
}
return true;
}
/**
* Selects a text fragment, relative to current caret position.
*
* \param ta Text area
* \return True on success, false otherwise
*/
static bool textarea_select_fragment(struct textarea * ta)
{
int caret_pos, sel_start = 0, sel_end = 0, index;
size_t b_start, b_end;
/* Fragment separators must be suitable for URLs and ordinary text */
static const char *sep = " /:.\r\n";
caret_pos = textarea_get_caret(ta);
if (caret_pos < 0) {
return false;
}
/* Compute byte offset of caret position */
for (b_start = 0, index = 0; index < caret_pos;
b_start = utf8_next(ta->show->data, ta->show->len,
b_start),
index++) {
/* Cache the character offset of the last separator */
if (strchr(sep, ta->show->data[b_start]) != NULL) {
/* Add one to start to skip over separator */
sel_start = index + 1;
}
}
/* Search for next separator, if any */
for (b_end = b_start; b_end < ta->show->len;
b_end = utf8_next(ta->show->data, ta->show->len,
b_end),
index++) {
if (strchr(sep, ta->show->data[b_end]) != NULL) {
sel_end = index;
break;
}
}
if (sel_start < sel_end) {
textarea_select(ta, sel_start, sel_end, false);
return true;
}
return false;
}
/**
* Selects paragraph, at current caret position.
*
* \param ta textarea widget
* \return True on success, false otherwise
*/
static bool textarea_select_paragraph(struct textarea * ta)
{
int caret_pos, index;
int sel_start = 0;
int sel_end = ta->show->utf8_len;
size_t b_start, b_end;
caret_pos = textarea_get_caret(ta);
if (caret_pos < 0) {
return false;
}
/* Work through text up to caret, looking for a place to start
* selection */
for (b_start = 0, index = 0; index < caret_pos;
b_start = utf8_next(ta->show->data, ta->show->len,
b_start),
index++) {
/* Set selection start as character after any new line found */
if (ta->show->data[b_start] == '\n') {
/* Add one to start to skip over separator */
sel_start = index + 1;
}
}
/* Search for end of selection */
for (b_end = b_start; b_end < ta->show->len;
b_end = utf8_next(ta->show->data, ta->show->len,
b_end),
index++) {
if (ta->show->data[b_end] == '\n') {
sel_end = index;
break;
}
}
if (sel_start < sel_end) {
textarea_select(ta, sel_start, sel_end, false);
return true;
}
return false;
}
/**
* 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
*/
static bool textarea_scroll_visible(struct textarea *ta)
{
int x0, x1, y0, y1; /* area we want caret inside */
int x, y; /* caret pos */
int xs = ta->scroll_x;
int ys = ta->scroll_y;
int vis;
int scrollbar_width;
bool scrolled = false;
if (ta->caret_pos.char_off == -1)
return false;
scrollbar_width = (ta->bar_y == NULL) ? 0 : SCROLLBAR_WIDTH;
x0 = ta->border_width + ta->pad_left;
x1 = ta->vis_width - (ta->border_width + ta->pad_right);
/* Adjust scroll pos for reduced extents */
vis = ta->vis_width - 2 * ta->border_width - scrollbar_width;
if (ta->h_extent - xs < vis)
xs -= vis - (ta->h_extent - xs);
/* Get caret pos on screen */
x = ta->caret_x - xs;
/* scroll as required */
if (x < x0)
xs += (x - x0);
else if (x > x1)
xs += (x - x1);
if (ta->bar_x == NULL && ta->scroll_x != 0 &&
ta->flags & TEXTAREA_MULTILINE) {
/* Scrollbar removed, set to zero */
ta->scroll_x = 0;
scrolled = true;
} else if (xs != ta->scroll_x) {
/* Scrolled, set new pos. */
if (ta->bar_x != NULL) {
scrollbar_set(ta->bar_x, xs, false);
xs = scrollbar_get_offset(ta->bar_x);
if (xs != ta->scroll_x) {
ta->scroll_x = xs;
scrolled = true;
}
} else if (!(ta->flags & TEXTAREA_MULTILINE)) {
ta->scroll_x = xs;
scrolled = true;
}
}
/* check and change vertical scroll */
if (ta->flags & TEXTAREA_MULTILINE) {
scrollbar_width = (ta->bar_x == NULL) ? 0 : SCROLLBAR_WIDTH;
y0 = 0;
y1 = ta->vis_height - 2 * ta->border_width -
ta->pad_top - ta->pad_bottom;
/* Adjust scroll pos for reduced extents */
vis = ta->vis_height - 2 * ta->border_width - scrollbar_width;
if (ta->v_extent - ys < vis)
ys -= vis - (ta->v_extent - ys);
/* Get caret pos on screen */
y = ta->caret_y - ys;
/* scroll as required */
if (y < y0)
ys += (y - y0);
else if (y + ta->line_height > y1)
ys += (y + ta->line_height - y1);
if (ys != ta->scroll_y && ta->bar_y != NULL) {
/* Scrolled, set new pos. */
scrollbar_set(ta->bar_y, ys, false);
ys = scrollbar_get_offset(ta->bar_y);
if (ys != ta->scroll_y) {
ta->scroll_y = ys;
scrolled = true;
}
} else if (ta->bar_y == NULL && ta->scroll_y != 0) {
/* Scrollbar removed, set to zero */
ta->scroll_y = 0;
scrolled = true;
}
}
return scrolled;
}
/**
* Callback for scrollbar widget.
*/
static void textarea_scrollbar_callback(void *client_data,
struct scrollbar_msg_data *scrollbar_data)
{
struct textarea *ta = client_data;
struct textarea_msg msg;
switch(scrollbar_data->msg) {
case SCROLLBAR_MSG_MOVED:
/* Scrolled; redraw everything */
ta->scroll_x = scrollbar_get_offset(ta->bar_x);
ta->scroll_y = scrollbar_get_offset(ta->bar_y);
msg.ta = ta;
msg.type = TEXTAREA_MSG_REDRAW_REQUEST;
msg.data.redraw.x0 = 0;
msg.data.redraw.y0 = 0;
msg.data.redraw.x1 = ta->vis_width;
msg.data.redraw.y1 = ta->vis_height;
ta->callback(ta->data, &msg);
if (!(ta->flags & TEXTAREA_INTERNAL_CARET)) {
/* Tell client where caret should be placed */
msg.ta = ta;
msg.type = TEXTAREA_MSG_CARET_UPDATE;
msg.data.caret.type = TEXTAREA_CARET_SET_POS;
msg.data.caret.pos.x = ta->caret_x - ta->scroll_x;
msg.data.caret.pos.y = ta->caret_y - ta->scroll_y;
msg.data.caret.pos.height = ta->line_height;
msg.data.caret.pos.clip = NULL;
ta->callback(ta->data, &msg);
}
break;
case SCROLLBAR_MSG_SCROLL_START:
ta->drag_info.type = TEXTAREA_DRAG_SCROLLBAR;
ta->drag_info.data.scrollbar = scrollbar_data->scrollbar;
msg.ta = ta;
msg.type = TEXTAREA_MSG_DRAG_REPORT;
msg.data.drag = ta->drag_info.type;
/* Tell client we're handling a drag */
ta->callback(ta->data, &msg);
break;
case SCROLLBAR_MSG_SCROLL_FINISHED:
ta->drag_info.type = TEXTAREA_DRAG_NONE;
msg.ta = ta;
msg.type = TEXTAREA_MSG_DRAG_REPORT;
msg.data.drag = ta->drag_info.type;
/* Tell client we finished handling the drag */
ta->callback(ta->data, &msg);
break;
default:
break;
}
}
/**
* Reflow a text area from the given line onwards
*
* \param ta Text area to reflow
* \param start Line number to begin reflow on
* \return true on success false otherwise
*/
static bool textarea_reflow(struct textarea *ta, unsigned int start)
{
char *text;
unsigned int len;
size_t b_off;
int x;
char *space, *para_end;
unsigned int line; /* line count */
unsigned int scroll_lines;
int avail_width;
int h_extent; /* horizontal extent */
int v_extent; /* vertical extent */
bool restart = false;
if (ta->lines == NULL) {
ta->lines =
malloc(LINE_CHUNK_SIZE * sizeof(struct line_info));
if (ta->lines == NULL) {
LOG(("malloc failed"));
return false;
}
ta->lines_alloc_size = LINE_CHUNK_SIZE;
}
if (!(ta->flags & TEXTAREA_MULTILINE)) {
/* Single line */
int w = ta->vis_width - 2 * ta->border_width -
ta->pad_left - ta->pad_right;
if (ta->flags & TEXTAREA_PASSWORD &&
ta->text.utf8_len != ta->password.utf8_len) {
/* Make password-obscured text have same number of
* characters as underlying text */
unsigned int c, b;
int diff = ta->text.utf8_len - ta->password.utf8_len;
unsigned int rep_len = sizeof(PASSWORD_REPLACEMENT) - 1;
unsigned int b_len = ta->text.utf8_len * rep_len + 1;
if (diff > 0 && b_len > ta->password.alloc) {
/* Increase password alloaction */
char *temp = realloc(ta->password.data,
b_len + 512);
if (temp == NULL) {
LOG(("realloc failed"));
return false;
}
ta->password.data = temp;
ta->password.alloc = b_len + 512;
}
b_len--;
for (c = 0; c < b_len; c += rep_len) {
for (b = 0; b < rep_len; b++) {
ta->password.data[c + b] =
PASSWORD_REPLACEMENT[b];
}
}
ta->password.data[b_len] = '\0';
ta->password.len = b_len + 1;
ta->password.utf8_len = ta->text.utf8_len;
}
ta->lines[0].b_start = 0;
ta->lines[0].b_length = ta->show->len - 1;
nsfont.font_width(&ta->fstyle, ta->show->data,
ta->show->len - 1, &x);
if (x > w)
w = x;
ta->h_extent = w + ta->pad_left + ta->pad_right;
ta->line_count = 1;
return true;
}
/* Find max number of lines before vertical scrollbar is required */
scroll_lines = (ta->vis_height - 2 * ta->border_width -
ta->pad_top - ta->pad_bottom) /
ta->line_height;
if ((signed)start > ta->line_count)
start = 0;
/** \todo pay attention to start param, for now force start at zero */
start = 0;
do {
/* Set line count to start point */
if (restart)
line = 0;
else
line = start;
/* Find available width */
avail_width = ta->vis_width - 2 * ta->border_width -
ta->pad_left - ta->pad_right;
if (avail_width < 0)
avail_width = 0;
h_extent = avail_width;
if (ta->text.len == 1) {
/* Handle empty textarea */
assert(ta->text.data[0] == '\0');
ta->lines[line].b_start = 0;
ta->lines[line++].b_length = 0;
ta->line_count = 1;
}
restart = false;
for (len = ta->text.len - 1, text = ta->text.data; len > 0;
len -= b_off, text += b_off) {
/* Find end of paragraph */
for (para_end = text; para_end < text + len;
para_end++) {
if (*para_end == '\n')
break;
}
/* Wrap current line in paragraph */
nsfont.font_split(&ta->fstyle, text, para_end - text,
avail_width, &b_off, &x);
/* b_off now marks space, or end of paragraph */
if (x > h_extent) {
h_extent = x;
}
if (x > avail_width && ta->bar_x == NULL) {
/* We need to insert a horizontal scrollbar */
int w = ta->vis_width - 2 * ta->border_width;
if (!scrollbar_create(true, w, w, w,
ta, textarea_scrollbar_callback,
&(ta->bar_x)))
return false;
if (ta->bar_y != NULL)
scrollbar_make_pair(ta->bar_x,
ta->bar_y);
ta->pad_bottom += SCROLLBAR_WIDTH;
/* Find new max visible lines */
scroll_lines = (ta->vis_height -
2 * ta->border_width -
ta->pad_top - ta->pad_bottom) /
ta->line_height;
}
/* Ensure enough storage for lines data */
if (line > ta->lines_alloc_size - 2) {
/* Up to two lines my be added in a pass */
struct line_info *temp = realloc(ta->lines,
(line + 2 + LINE_CHUNK_SIZE) *
sizeof(struct line_info));
if (temp == NULL) {
LOG(("realloc failed"));
return false;
}
ta->lines = temp;
ta->lines_alloc_size = line + 2 +
LINE_CHUNK_SIZE;
}
if (para_end == text + b_off && *para_end == '\n') {
/* Not found any spaces to wrap at, and we
* have a newline char */
ta->lines[line].b_start = text - ta->text.data;
ta->lines[line++].b_length = para_end - text;
/* Jump newline */
b_off++;
if (len - b_off == 0) {
/* reached end of input;
* add last line */
ta->lines[line].b_start = text +
b_off - ta->text.data;
ta->lines[line++].b_length = 0;
}
if (line > scroll_lines && ta->bar_y == NULL)
break;
continue;
} else if (len - b_off > 0) {
/* soft wraped, 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].b_start = text - ta->text.data;
ta->lines[line++].b_length = b_off;
if (line > scroll_lines && ta->bar_y == NULL)
break;
}
if (h_extent <= avail_width && ta->bar_x != NULL) {
/* We need to remove a horizontal scrollbar */
scrollbar_destroy(ta->bar_x);
ta->bar_x = NULL;
ta->pad_bottom -= SCROLLBAR_WIDTH;
/* Find new max visible lines */
scroll_lines = (ta->vis_height - 2 * ta->border_width -
ta->pad_top - ta->pad_bottom) /
ta->line_height;
}
if (line > scroll_lines && ta->bar_y == NULL) {
/* Add vertical scrollbar */
int h = ta->vis_height - 2 * ta->border_width;
if (!scrollbar_create(false, h, h, h,
ta, textarea_scrollbar_callback,
&(ta->bar_y)))
return false;
if (ta->bar_x != NULL)
scrollbar_make_pair(ta->bar_x,
ta->bar_y);
ta->pad_right += SCROLLBAR_WIDTH;
restart = true;
} else if (line <= scroll_lines && ta->bar_y != NULL) {
/* Remove vertical scrollbar */
scrollbar_destroy(ta->bar_y);
ta->bar_y = NULL;
ta->pad_right -= SCROLLBAR_WIDTH;
restart = true;
}
} while (restart);
h_extent += ta->pad_left + ta->pad_right -
(ta->bar_y != NULL ? SCROLLBAR_WIDTH : 0);
v_extent = line * ta->line_height + ta->pad_top +
ta->pad_bottom -
(ta->bar_x != NULL ? SCROLLBAR_WIDTH : 0);
if (ta->bar_x != NULL) {
/* Set horizontal scrollbar extents */
int w = ta->vis_width - 2 * ta->border_width -
(ta->bar_y != NULL ? SCROLLBAR_WIDTH : 0);
scrollbar_set_extents(ta->bar_x, w, w, h_extent);
}
if (ta->bar_y != NULL) {
/* Set vertical scrollbar extents */
int h = ta->vis_height - 2 * ta->border_width;
scrollbar_set_extents(ta->bar_y, h,
h - (ta->bar_x != NULL ? SCROLLBAR_WIDTH : 0),
v_extent);
}
ta->h_extent = h_extent;
ta->v_extent = v_extent;
ta->line_count = line;
return true;
}
/**
* get byte/character offset from the beginning of the text for some coordinates
*
* \param ta Text area
* \param x X coordinate
* \param y Y coordinate
* \param c_off Updated to character offset
*/
static void textarea_get_xy_offset(struct textarea *ta, int x, int y,
unsigned int *c_off)
{
size_t bpos, temp; /* Byte positions in utf8 string */
unsigned int cpos; /* Character positions in utf8 string */
int line;
if (!ta->line_count) {
*c_off = 0;
return;
}
x = x - ta->border_width - ta->pad_left + ta->scroll_x;
y = y - ta->border_width - ta->pad_top + ta->scroll_y;
if (x < 0)
x = 0;
line = y / ta->line_height;
if (ta->line_count - 1 < line)
line = ta->line_count - 1;
if (line < 0)
line = 0;
/* Get byte position */
nsfont.font_position_in_string(&ta->fstyle,
ta->show->data + ta->lines[line].b_start,
ta->lines[line].b_length, x, &bpos, &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 (ta->flags & TEXTAREA_MULTILINE && ta->lines[line].b_length > 1 &&
bpos == (unsigned)ta->lines[line].b_length &&
ta->show->data[ta->lines[line].b_start +
ta->lines[line].b_length - 1] == ' ')
bpos--;
/* Get character position */
for (temp = 0, cpos = 0; temp < bpos + ta->lines[line].b_start;
temp = utf8_next(ta->show->data, ta->show->len, temp))
cpos++;
/* Set the return values */
*c_off = cpos;
}
/**
* 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
*/
static bool textarea_set_caret_xy(struct textarea *ta, int x, int y)
{
unsigned int c_off;
if (ta->flags & TEXTAREA_READONLY)
return true;
textarea_get_xy_offset(ta, x, y, &c_off);
return textarea_set_caret(ta, c_off);
}
/**
* Insert text into the textarea
*
* \param ta Textarea widget
* \param c_index 0-based character index to insert at
* \param text UTF-8 text to insert
* \param b_len Byte length of UTF-8 text
* \return false on memory exhaustion, true otherwise
*/
static bool textarea_insert_text(struct textarea *ta, unsigned int c_index,
const char *text, size_t b_len)
{
size_t b_off;
if (ta->flags & TEXTAREA_READONLY)
return true;
/* Find insertion point */
if (c_index > ta->text.utf8_len)
c_index = ta->text.utf8_len;
/* find byte offset of insertion point */
for (b_off = 0; c_index > 0;
b_off = utf8_next(ta->text.data, ta->text.len, b_off))
c_index--;
if (b_len + ta->text.len >= ta->text.alloc) {
char *temp = realloc(ta->text.data, b_len + ta->text.len + 512);
if (temp == NULL) {
LOG(("realloc failed"));
return false;
}
ta->text.data = temp;
ta->text.alloc = b_len + ta->text.len + 512;
}
/* Shift text following up */
memmove(ta->text.data + b_off + b_len, ta->text.data + b_off,
ta->text.len - b_off);
/* Insert new text */
memcpy(ta->text.data + b_off, text, b_len);
ta->text.len += b_len;
ta->text.utf8_len += utf8_bounded_length(text, b_len);
textarea_normalise_text(ta, b_off, b_len);
/** \todo calculate line to reflow from */
return textarea_reflow(ta, 0);
}
static inline void textarea_char_to_byte_offset(struct textarea_utf8 *text,
unsigned int start, unsigned int end,
size_t *b_start, size_t *b_end)
{
size_t diff = end - start;
/* find byte offset of replace start */
for (*b_start = 0; start-- > 0;
*b_start = utf8_next(text->data, text->len, *b_start))
; /* do nothing */
/* find byte length of replaced text */
for (*b_end = *b_start; diff-- > 0;
*b_end = utf8_next(text->data, text->len, *b_end))
; /* do nothing */
}
/**
* Replace text in a textarea
*
* \param ta Textarea widget
* \param start Start character index of replaced section (inclusive)
* \param end End character index of replaced section (exclusive)
* \param rep Replacement UTF-8 text to insert
* \param rep_len Byte length of replacement UTF-8 text
* \param add_to_clipboard True iff replaced text to be added to clipboard
* \return false on memory exhaustion, true otherwise
*/
static bool textarea_replace_text(struct textarea *ta, unsigned int start,
unsigned int end, const char *rep, size_t rep_len,
bool add_to_clipboard)
{
size_t b_start, b_end;
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 && rep != NULL)
return textarea_insert_text(ta, start, rep, rep_len);
if (start > end)
return false;
/* Place CUTs on clipboard */
if (add_to_clipboard) {
textarea_char_to_byte_offset(ta->show, start, end,
&b_start, &b_end);
gui_set_clipboard(ta->show->data + b_start, b_end - b_start,
NULL, 0);
}
textarea_char_to_byte_offset(&ta->text, start, end, &b_start, &b_end);
if (rep == NULL) {
/* No replacement text */
return true;
}
/* Ensure textarea's text buffer is large enough */
if (rep_len + ta->text.len - (b_end - b_start) >= ta->text.alloc) {
char *temp = realloc(ta->text.data,
rep_len + ta->text.len - (b_end - b_start) + 512);
if (temp == NULL) {
LOG(("realloc failed"));
return false;
}
ta->text.data = temp;
ta->text.alloc =
rep_len + ta->text.len - (b_end - b_start) + 512;
}
/* Shift text following to new position */
memmove(ta->text.data + b_start + rep_len, ta->text.data + b_end,
ta->text.len - b_end);
/* Insert new text */
memcpy(ta->text.data + b_start, rep, rep_len);
ta->text.len += (int)rep_len - (b_end - b_start);
ta->text.utf8_len = utf8_length(ta->text.data);
textarea_normalise_text(ta, b_start, rep_len);
/** \todo calculate line to reflow from */
return textarea_reflow(ta, 0);
}
/**
* 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
*/
static bool textarea_drag_end(struct textarea *ta, browser_mouse_state mouse,
int x, int y)
{
int c_end;
unsigned int c_off;
struct textarea_msg msg;
assert(ta->drag_info.type != TEXTAREA_DRAG_NONE);
switch (ta->drag_info.type) {
case TEXTAREA_DRAG_SCROLLBAR:
if (ta->drag_info.data.scrollbar == ta->bar_x) {
x -= ta->border_width;
y -= ta->vis_height - ta->border_width -
SCROLLBAR_WIDTH;
} else {
x -= ta->vis_width - ta->border_width -
SCROLLBAR_WIDTH;
y -= ta->border_width;
}
scrollbar_mouse_drag_end(ta->drag_info.data.scrollbar,
mouse, x, y);
assert(ta->drag_info.type == TEXTAREA_DRAG_NONE);
/* Return, since drag end already reported to textarea client */
return true;
case TEXTAREA_DRAG_SELECTION:
ta->drag_info.type = TEXTAREA_DRAG_NONE;
textarea_get_xy_offset(ta, x, y, &c_off);
c_end = c_off;
if (!textarea_select(ta, ta->drag_start_char, c_end, false))
return false;
break;
default:
return false;
}
/* Report drag end to client, if not already reported */
assert(ta->drag_info.type == TEXTAREA_DRAG_NONE);
msg.ta = ta;
msg.type = TEXTAREA_MSG_DRAG_REPORT;
msg.data.drag = ta->drag_info.type;
ta->callback(ta->data, &msg);
return true;
}
/**
* Setup text offsets after height / border / padding change
*
* \param ta Textarea widget
*/
static void textarea_setup_text_offsets(struct textarea *ta)
{
int text_y_offset, text_y_offset_baseline;
text_y_offset = text_y_offset_baseline = ta->border_width;
if (ta->flags & TEXTAREA_MULTILINE) {
/* Multiline textarea */
text_y_offset += ta->pad_top;
text_y_offset_baseline += (ta->line_height * 3 + 2) / 4 +
ta->pad_top;
} else {
/* Single line text area; text is vertically centered */
int vis_height = ta->vis_height - 2 * ta->border_width;
text_y_offset += (vis_height - ta->line_height + 1) / 2;
text_y_offset_baseline += (vis_height * 3 + 2) / 4;
}
ta->text_y_offset = text_y_offset;
ta->text_y_offset_baseline = text_y_offset_baseline;
}
/* exported interface, documented in textarea.h */
struct textarea *textarea_create(const textarea_flags flags,
const textarea_setup *setup,
textarea_client_callback callback, void *data)
{
struct textarea *ret;
/* Sanity check flags */
assert(!(flags & TEXTAREA_MULTILINE &&
flags & TEXTAREA_PASSWORD));
if (callback == NULL) {
LOG(("no callback provided"));
return NULL;
}
ret = malloc(sizeof(struct textarea));
if (ret == NULL) {
LOG(("malloc failed"));
return NULL;
}
ret->callback = callback;
ret->data = data;
ret->flags = flags;
ret->vis_width = setup->width;
ret->vis_height = setup->height;
ret->pad_top = setup->pad_top;
ret->pad_right = setup->pad_right;
ret->pad_bottom = setup->pad_bottom;
ret->pad_left = setup->pad_left;
ret->border_width = setup->border_width;
ret->border_col = setup->border_col;
ret->fstyle = setup->text;
ret->sel_fstyle = setup->text;
ret->sel_fstyle.foreground = setup->selected_text;
ret->sel_fstyle.background = setup->selected_bg;
ret->scroll_x = 0;
ret->scroll_y = 0;
ret->bar_x = NULL;
ret->bar_y = NULL;
ret->drag_start_char = 0;
ret->drag_info.type = TEXTAREA_DRAG_NONE;
ret->text.data = malloc(512);
if (ret->text.data == NULL) {
LOG(("malloc failed"));
free(ret);
return NULL;
}
ret->text.data[0] = '\0';
ret->text.alloc = 512;
ret->text.len = 1;
ret->text.utf8_len = 0;
if (flags & TEXTAREA_PASSWORD) {
ret->password.data = malloc(512);
if (ret->password.data == NULL) {
LOG(("malloc failed"));
free(ret->text.data);
free(ret);
return NULL;
}
ret->password.data[0] = '\0';
ret->password.alloc = 512;
ret->password.len = 1;
ret->password.utf8_len = 0;
ret->show = &ret->password;
} else {
ret->password.data = NULL;
ret->password.alloc = 0;
ret->password.len = 0;
ret->password.utf8_len = 0;
ret->show = &ret->text;
}
ret->line_height = FIXTOINT(FDIV((FMUL(FLTTOFIX(1.3),
FMUL(nscss_screen_dpi, INTTOFIX((setup->text.size))))),
FONT_SIZE_SCALE * F_72));
ret->caret_pos.line = ret->caret_pos.char_off = -1;
ret->caret_x = 0;
ret->caret_y = 0;
ret->sel_start = -1;
ret->sel_end = -1;
ret->line_count = 0;
ret->lines = NULL;
ret->lines_alloc_size = 0;
textarea_setup_text_offsets(ret);
textarea_reflow(ret, 0);
return ret;
}
/* exported interface, documented in textarea.h */
void textarea_destroy(struct textarea *ta)
{
if (ta->bar_x)
scrollbar_destroy(ta->bar_x);
if (ta->bar_y)
scrollbar_destroy(ta->bar_y);
if (ta->flags & TEXTAREA_PASSWORD)
free(ta->password.data);
free(ta->text.data);
free(ta->lines);
free(ta);
}
/* exported interface, documented in textarea.h */
bool textarea_set_text(struct textarea *ta, const char *text)
{
unsigned int len = strlen(text) + 1;
if (len >= ta->text.alloc) {
char *temp = realloc(ta->text.data, len + 512);
if (temp == NULL) {
LOG(("realloc failed"));
return false;
}
ta->text.data = temp;
ta->text.alloc = len + 512;
}
memcpy(ta->text.data, text, len);
ta->text.len = len;
ta->text.utf8_len = utf8_length(ta->text.data);
textarea_normalise_text(ta, 0, len);
return textarea_reflow(ta, 0);
}
/* exported interface, documented in textarea.h */
bool textarea_drop_text(struct textarea *ta, const char *text,
size_t text_length)
{
struct textarea_msg msg;
unsigned int caret_pos;
size_t text_chars;
if (ta->flags & TEXTAREA_READONLY)
return false;
if (text == NULL)
return false;
text_chars = utf8_bounded_length(text, text_length);
caret_pos = textarea_get_caret(ta);
if (ta->sel_start != -1) {
if (!textarea_replace_text(ta, ta->sel_start, ta->sel_end,
text, text_length, false))
return false;
caret_pos = ta->sel_start + text_chars;
ta->sel_start = ta->sel_end = -1;
} else {
if (!textarea_replace_text(ta, caret_pos, caret_pos,
text, text_length, false))
return false;
caret_pos += text_chars;
}
textarea_set_caret(ta, caret_pos);
msg.ta = ta;
msg.type = TEXTAREA_MSG_REDRAW_REQUEST;
msg.data.redraw.x0 = 0;
msg.data.redraw.y0 = 0;
msg.data.redraw.x1 = ta->vis_width;
msg.data.redraw.y1 = ta->vis_height;
ta->callback(ta->data, &msg);
return true;
}
/* exported interface, documented in textarea.h */
int textarea_get_text(struct textarea *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.data, ta->text.len);
return ta->text.len;
}
/* exported interface, documented in textarea.h */
bool textarea_set_caret(struct textarea *ta, int caret)
{
unsigned int c_len;
unsigned int b_off;
int i;
int index;
int x, y;
int x0, y0, x1, y1;
int width, height;
struct textarea_msg msg;
bool scrolled;
if (ta->flags & TEXTAREA_READONLY)
return true;
c_len = ta->show->utf8_len;
if (caret != -1 && caret > (signed)c_len)
caret = c_len;
/* Delete the old caret */
if (ta->caret_pos.char_off != -1 &&
ta->flags & TEXTAREA_INTERNAL_CARET) {
x0 = ta->caret_x - ta->scroll_x;
y0 = ta->caret_y - ta->scroll_y;
width = 2;
height = ta->line_height;
msg.ta = ta;
msg.type = TEXTAREA_MSG_REDRAW_REQUEST;
msg.data.redraw.x0 = x0;
msg.data.redraw.y0 = y0;
msg.data.redraw.x1 = x0 + width;
msg.data.redraw.y1 = y0 + height;
/* Ensure it is hidden */
ta->caret_pos.char_off = -1;
ta->callback(ta->data, &msg);
}
/* 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->show->data, ta->show->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->show->data +
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->show->data,
ta->show->len, b_off))
; /* do nothing */
nsfont.font_width(&ta->fstyle,
ta->show->data +
ta->lines[ta->caret_pos.line].b_start,
b_off - ta->lines[ta->caret_pos.line].b_start,
&x);
x += ta->border_width + ta->pad_left;
ta->caret_x = x;
y = ta->line_height * ta->caret_pos.line + ta->text_y_offset;
ta->caret_y = y;
scrolled = textarea_scroll_visible(ta);
if (!scrolled && ta->flags & TEXTAREA_INTERNAL_CARET) {
/* Didn't scroll, just moved caret.
* Caret is internal caret, redraw it */
x -= ta->scroll_x;
y -= ta->scroll_y;
x0 = max(x - 1, ta->border_width);
y0 = max(y, 0);
x1 = min(x + 1, ta->vis_width - ta->border_width);
y1 = min(y + ta->line_height,
ta->vis_height);
width = x1 - x0;
height = y1 - y0;
if (width > 0 && height > 0) {
msg.ta = ta;
msg.type = TEXTAREA_MSG_REDRAW_REQUEST;
msg.data.redraw.x0 = x0;
msg.data.redraw.y0 = y0;
msg.data.redraw.x1 = x0 + width;
msg.data.redraw.y1 = y0 + height;
ta->callback(ta->data, &msg);
}
} else if (scrolled && !(ta->flags & TEXTAREA_MULTILINE)) {
/* Textarea scrolled, whole area needs redraw */
/* With multi-line textareas, the scrollbar
* callback will have requested redraw. */
msg.ta = ta;
msg.type = TEXTAREA_MSG_REDRAW_REQUEST;
msg.data.redraw.x0 = 0;
msg.data.redraw.y0 = 0;
msg.data.redraw.x1 = ta->vis_width;
msg.data.redraw.y1 = ta->vis_height;
ta->callback(ta->data, &msg);
}
if (!(ta->flags & TEXTAREA_INTERNAL_CARET)) {
/* Tell client where caret should be placed */
msg.ta = ta;
msg.type = TEXTAREA_MSG_CARET_UPDATE;
msg.data.caret.type = TEXTAREA_CARET_SET_POS;
msg.data.caret.pos.x = x - ta->scroll_x;
msg.data.caret.pos.y = y - ta->scroll_y;
msg.data.caret.pos.height = ta->line_height;
msg.data.caret.pos.clip = NULL;
ta->callback(ta->data, &msg);
}
} else if (!(ta->flags & TEXTAREA_INTERNAL_CARET)) {
/* Caret hidden, and client is responsible: tell client */
msg.ta = ta;
msg.type = TEXTAREA_MSG_CARET_UPDATE;
msg.data.caret.type = TEXTAREA_CARET_HIDE;
ta->callback(ta->data, &msg);
}
return true;
}
/* exported interface, documented in textarea.h */
int textarea_get_caret(struct textarea *ta)
{
unsigned int c_off = 0, b_off;
/* Ensure caret isn't hidden */
if (ta->caret_pos.char_off < 0)
textarea_set_caret(ta, 0);
/* if the text is a trailing NUL only */
if (ta->text.utf8_len == 0)
return 0;
if (ta->caret_pos.line >= ta->line_count)
return ta->text.utf8_len;
/* 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.data, ta->text.len, b_off))
c_off++;
return c_off + ta->caret_pos.char_off;
}
/* exported interface, documented in textarea.h */
void textarea_redraw(struct textarea *ta, int x, int y, colour bg, float scale,
const struct rect *clip, const struct redraw_context *ctx)
{
const struct plotter_table *plot = ctx->plot;
int line0, line1, line, left, right, line_y;
int chars, text_y_offset, text_y_offset_baseline;
unsigned int c_pos, c_len, c_len_part, b_start, b_end, line_len;
unsigned int sel_start, sel_end;
char *line_text;
struct rect r, s;
bool selected = false;
plot_font_style_t fstyle;
int fsize = ta->fstyle.size;
int line_height = ta->line_height;
plot_style_t plot_style_fill_bg = {
.stroke_type = PLOT_OP_TYPE_NONE,
.stroke_width = 0,
.stroke_colour = NS_TRANSPARENT,
.fill_type = PLOT_OP_TYPE_SOLID,
.fill_colour = ta->border_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;
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 (scale == 1.0) {
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;
} else {
if (r.x1 > x + ta->vis_width * scale)
r.x1 = x + ta->vis_width * scale;
if (r.y1 > y + ta->vis_height * scale)
r.y1 = y + ta->vis_height * scale;
}
plot->clip(&r);
if (ta->border_col != NS_TRANSPARENT &&
ta->border_width > 0) {
/* Plot border */
plot->rectangle(x, y, x + ta->vis_width, y + ta->vis_height,
&plot_style_fill_bg);
}
if (ta->fstyle.background != NS_TRANSPARENT) {
/* Plot background */
plot_style_fill_bg.fill_colour = ta->fstyle.background;
plot->rectangle(x + ta->border_width, y + ta->border_width,
x + ta->vis_width - ta->border_width,
y + ta->vis_height - ta->border_width,
&plot_style_fill_bg);
}
if (scale == 1.0) {
if (r.x0 < x + ta->border_width)
r.x0 = x + ta->border_width;
if (r.x1 > x + ta->vis_width - ta->border_width)
r.x1 = x + ta->vis_width - ta->border_width;
if (r.y0 < y + ta->border_width)
r.y0 = y + ta->border_width;
if (r.y1 > y + ta->vis_height - ta->border_width -
(ta->bar_x != NULL ? SCROLLBAR_WIDTH : 0))
r.y1 = y + ta->vis_height - ta->border_width -
(ta->bar_x != NULL ? SCROLLBAR_WIDTH :
0);
} else {
if (r.x0 < x + ta->border_width * scale)
r.x0 = x + ta->border_width * scale;
if (r.x1 > x + (ta->vis_width - ta->border_width) * scale)
r.x1 = x + (ta->vis_width - ta->border_width) * scale;
if (r.y0 < y + ta->border_width * scale)
r.y0 = y + ta->border_width * scale;
if (r.y1 > y + (ta->vis_height - ta->border_width -
(ta->bar_x != NULL ? SCROLLBAR_WIDTH : 0)) *
scale)
r.y1 = y + (ta->vis_height - ta->border_width -
(ta->bar_x != NULL ? SCROLLBAR_WIDTH :
0) * scale);
}
if (line0 > 0)
c_pos = utf8_bounded_length(ta->show->data,
ta->lines[line0].b_start);
else
c_pos = 0;
text_y_offset = ta->text_y_offset;
text_y_offset_baseline = ta->text_y_offset_baseline;
if (scale != 1.0) {
text_y_offset *= scale;
text_y_offset_baseline *= scale;
fsize *= scale;
line_height *= scale;
}
plot_style_fill_bg.fill_colour = ta->sel_fstyle.background;
for (line = line0; (line <= line1) &&
(y + line * ta->line_height <= r.y1 + ta->scroll_y);
line++) {
if (ta->lines[line].b_length == 0) {
c_pos++;
continue;
}
/* reset clip rectangle */
plot->clip(&r);
c_len = utf8_bounded_length(
&(ta->show->data[ta->lines[line].b_start]),
ta->lines[line].b_length);
b_end = 0;
right = x + ta->border_width + ta->pad_left - ta->scroll_x;
do {
sel_start = ta->sel_start;
sel_end = ta->sel_end;
/* get length of part of line */
if (ta->sel_end == -1 || ta->sel_end == ta->sel_start ||
sel_end <= c_pos ||
sel_start > c_pos + c_len) {
/* rest of line unselected */
selected = false;
c_len_part = c_len;
fstyle = ta->fstyle;
} else if (sel_start <= c_pos &&
sel_end > c_pos + c_len) {
/* rest of line selected */
selected = true;
c_len_part = c_len;
fstyle = ta->sel_fstyle;
} else if (sel_start > c_pos) {
/* next part of line unselected */
selected = false;
c_len_part = sel_start - c_pos;
fstyle = ta->fstyle;
} else if (sel_end > c_pos) {
/* next part of line selected */
selected = true;
c_len_part = sel_end - c_pos;
fstyle = ta->sel_fstyle;
} else {
assert(0);
}
fstyle.size = fsize;
line_text = &(ta->show->data[ta->lines[line].b_start]);
line_len = ta->lines[line].b_length;
/* find b_start and b_end for this part of the line */
b_start = b_end;
chars = c_len_part;
for (b_end = b_start; chars > 0; chars--)
b_end = utf8_next(line_text, line_len, b_end);
/* find clip left/right for this part of line */
left = right;
nsfont.font_width(&fstyle, line_text,
b_end, &right);
right += x + ta->border_width + ta->pad_left -
ta->scroll_x;
/* set clip rectangle for line part */
s = r;
if (s.x1 < left || s.x0 > right) {
/* Skip this span, it's outside the visible */
c_pos += c_len_part;
c_len -= c_len_part;
continue;
}
/* Adjust clip rectangle to span limits */
if (s.x0 < left)
s.x0 = left;
if (s.x1 > right)
s.x1 = right;
plot->clip(&s);
line_y = line * ta->line_height - ta->scroll_y;
if (scale != 1.0) {
line_y *= scale;
}
if (selected) {
/* draw selection fill */
plot->rectangle(s.x0, y + line_y +
text_y_offset,
s.x1, y + line_y + line_height +
text_y_offset,
&plot_style_fill_bg);
}
/* draw text */
plot->text(x + ta->border_width + ta->pad_left -
ta->scroll_x,
y + line_y + text_y_offset_baseline,
ta->show->data +
ta->lines[line].b_start,
ta->lines[line].b_length, &fstyle);
c_pos += c_len_part;
c_len -= c_len_part;
} while (c_pos < c_pos + c_len);
/* if there is a newline between the lines, skip it */
if (line < ta->line_count - 1 &&
ta->lines[line + 1].b_start !=
ta->lines[line].b_start +
ta->lines[line].b_length)
c_pos++;
}
if (ta->flags & TEXTAREA_INTERNAL_CARET &&
(ta->sel_end == -1 || ta->sel_start == ta->sel_end) &&
ta->caret_pos.char_off >= 0) {
/* No native caret, there is no selection, and caret visible */
int caret_y = y - ta->scroll_y + ta->caret_y;
plot->clip(&r);
/* Render our own caret */
plot->line(x - ta->scroll_x + ta->caret_x, caret_y,
x - ta->scroll_x + ta->caret_x,
caret_y + ta->line_height,
&pstyle_stroke_caret);
}
plot->clip(clip);
if (ta->bar_x != NULL)
scrollbar_redraw(ta->bar_x,
x / scale + ta->border_width,
y / scale + ta->vis_height - ta->border_width -
SCROLLBAR_WIDTH,
clip, scale, ctx);
if (ta->bar_y != NULL)
scrollbar_redraw(ta->bar_y,
x / scale + ta->vis_width - ta->border_width -
SCROLLBAR_WIDTH,
y / scale + ta->border_width,
clip, scale, ctx);
}
/* exported interface, documented in textarea.h */
bool textarea_keypress(struct textarea *ta, uint32_t key)
{
struct textarea_msg msg;
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 (ta->sel_start != -1) {
if (!textarea_replace_text(ta,
ta->sel_start,
ta->sel_end, utf8, length, false))
return false;
caret = ta->sel_start + 1;
textarea_clear_selection(ta);
} else {
if (!textarea_replace_text(ta,
caret, caret,
utf8, length, false))
return false;
caret++;
redraw = true;
}
} else switch (key) {
case KEY_SELECT_ALL:
caret = ta->text.utf8_len;
textarea_select(ta, 0, ta->text.utf8_len, true);
return true;
case KEY_COPY_SELECTION:
if (ta->sel_start != -1) {
if (!textarea_replace_text(ta,
ta->sel_start,
ta->sel_end,
NULL, 0, true))
return false;
}
break;
case KEY_DELETE_LEFT:
if (readonly)
break;
if (ta->sel_start != -1) {
if (!textarea_replace_text(ta,
ta->sel_start,
ta->sel_end, "", 0, false))
return false;
caret = ta->sel_start;
textarea_clear_selection(ta);
} else if (caret > 0) {
if (!textarea_replace_text(ta,
caret - 1,
caret, "", 0, false))
return false;
caret--;
redraw = true;
}
break;
case KEY_CR:
case KEY_NL:
if (readonly)
break;
if (ta->sel_start != -1) {
if (!textarea_replace_text(ta,
ta->sel_start, ta->sel_end,
"\n", 1, false))
return false;
caret = ta->sel_start + 1;
textarea_clear_selection(ta);
} else {
if (!textarea_replace_text(ta,
caret, caret,
"\n", 1, false))
return false;
caret++;
redraw = true;
}
break;
case KEY_DELETE_LINE:
if (readonly)
break;
if (ta->sel_start != -1) {
if (!textarea_replace_text(ta,
ta->sel_start,
ta->sel_end, "", 0, false))
return false;
caret = ta->sel_start;
textarea_clear_selection(ta);
} else {
if (ta->lines[line].b_length != 0) {
/* Delete line */
b_off = ta->lines[line].b_start;
b_len = ta->lines[line].b_length;
l_len = utf8_bounded_length(
&(ta->show->
data[b_off]), b_len);
caret -= ta->caret_pos.char_off;
if (!textarea_replace_text(ta, caret,
caret + l_len, "", 0,
false))
return false;
} else if (caret < ta->text.utf8_len) {
/* Delete blank line */
if (!textarea_replace_text(ta,
caret, caret + 1, "", 0,
false))
return false;
}
redraw = true;
}
break;
case KEY_PASTE:
{
char *clipboard = NULL;
size_t clipboard_length;
size_t clipboard_chars;
if (readonly)
break;
gui_get_clipboard(&clipboard, &clipboard_length);
if (clipboard == NULL)
return false;
clipboard_chars = utf8_bounded_length(clipboard,
clipboard_length);
if (ta->sel_start != -1) {
if (!textarea_replace_text(ta,
ta->sel_start, ta->sel_end,
clipboard, clipboard_length,
false))
return false;
caret = ta->sel_start + clipboard_chars;
textarea_clear_selection(ta);
} else {
if (!textarea_replace_text(ta,
caret, caret,
clipboard, clipboard_length,
false))
return false;
caret += clipboard_chars;
redraw = true;
}
free(clipboard);
}
break;
case KEY_CUT_SELECTION:
if (readonly)
break;
if (ta->sel_start != -1) {
if (!textarea_replace_text(ta,
ta->sel_start,
ta->sel_end, "", 0, true))
return false;
caret = ta->sel_start;
textarea_clear_selection(ta);
}
break;
case KEY_ESCAPE:
/* Fall through to KEY_CLEAR_SELECTION */
case KEY_CLEAR_SELECTION:
return textarea_clear_selection(ta);
case KEY_LEFT:
if (readonly)
break;
if (caret > 0)
caret--;
if (ta->sel_start != -1) {
textarea_clear_selection(ta);
}
break;
case KEY_RIGHT:
if (readonly)
break;
if (caret < ta->text.utf8_len)
caret++;
if (ta->sel_start != -1) {
textarea_clear_selection(ta);
}
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->sel_start != -1) {
textarea_clear_selection(ta);
}
if (!(ta->flags & TEXTAREA_MULTILINE))
break;
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 (b_len > 0 && ta->text.data[b_off + b_len - 1] == ' '
&& line < ta->line_count - 1)
b_len--;
l_len = utf8_bounded_length(&(ta->text.data[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->sel_start != -1) {
textarea_clear_selection(ta);
}
if (!(ta->flags & TEXTAREA_MULTILINE))
break;
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.data[b_off + b_len - 1] == ' ' &&
line < ta->line_count - 1)
b_len--;
l_len = utf8_bounded_length(&(ta->text.data[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->sel_start != -1) {
if (!textarea_replace_text(ta,
ta->sel_start,
ta->sel_end, "", 0, false))
return false;
caret = ta->sel_start;
textarea_clear_selection(ta);
} else {
if (caret < ta->text.utf8_len) {
if (!textarea_replace_text(ta,
caret, caret + 1,
"", 0, false))
return false;
redraw = true;
}
}
break;
case KEY_LINE_START:
if (readonly)
break;
caret -= ta->caret_pos.char_off;
if (ta->sel_start != -1) {
textarea_clear_selection(ta);
}
break;
case KEY_LINE_END:
if (readonly)
break;
caret = utf8_bounded_length(ta->text.data,
ta->lines[ta->caret_pos.line].b_start +
ta->lines[ta->caret_pos.line].b_length);
if (ta->text.data[ta->lines[ta->caret_pos.line].
b_start +
ta->lines[ta->caret_pos.line].b_length
- 1] == ' ')
caret--;
if (ta->sel_start != -1) {
textarea_clear_selection(ta);
}
break;
case KEY_TEXT_START:
if (readonly)
break;
caret = 0;
if (ta->sel_start != -1) {
textarea_clear_selection(ta);
}
break;
case KEY_TEXT_END:
if (readonly)
break;
caret = ta->text.utf8_len;
if (ta->sel_start != -1) {
textarea_clear_selection(ta);
}
break;
case KEY_WORD_LEFT:
case KEY_WORD_RIGHT:
break;
case KEY_DELETE_LINE_END:
if (readonly)
break;
if (ta->sel_start != -1) {
if (!textarea_replace_text(ta,
ta->sel_start,
ta->sel_end, "", 0, false))
return false;
caret = ta->sel_start;
textarea_clear_selection(ta);
} else {
b_off = ta->lines[line].b_start;
b_len = ta->lines[line].b_length;
l_len = utf8_bounded_length(
&(ta->show->data[b_off]),
b_len) - ta->caret_pos.char_off;
if (!textarea_replace_text(ta, caret,
caret + l_len, "", 0, false))
return false;
redraw = true;
}
break;
case KEY_DELETE_LINE_START:
if (readonly)
break;
if (ta->sel_start != -1) {
if (!textarea_replace_text(ta,
ta->sel_start,
ta->sel_end, "", 0, false))
return false;
caret = ta->sel_start;
textarea_clear_selection(ta);
} else {
if (!textarea_replace_text(ta,
caret - ta->caret_pos.char_off,
caret, "", 0, false))
return false;
caret -= ta->caret_pos.char_off;
redraw = true;
}
break;
default:
return false;
}
if (caret != caret_init || redraw)
textarea_set_caret(ta, caret);
//TODO:redraw only the important part
if (redraw) {
msg.ta = ta;
msg.type = TEXTAREA_MSG_REDRAW_REQUEST;
msg.data.redraw.x0 = 0;
msg.data.redraw.y0 = 0;
msg.data.redraw.x1 = ta->vis_width;
msg.data.redraw.y1 = ta->vis_height;
ta->callback(ta->data, &msg);
}
return true;
}
/* exported interface, documented in textarea.h */
bool textarea_mouse_action(struct textarea *ta, browser_mouse_state mouse,
int x, int y)
{
int c_start, c_end;
int sx, sy; /* xy coord offset for scrollbar */
int sl; /* scrollbar length */
unsigned int c_off;
struct textarea_msg msg;
if (ta->drag_info.type != TEXTAREA_DRAG_NONE &&
mouse == BROWSER_MOUSE_HOVER) {
/* There is a drag that we must end */
textarea_drag_end(ta, mouse, x, y);
}
if (ta->drag_info.type == TEXTAREA_DRAG_SCROLLBAR) {
/* Scrollbar drag in progress; pass input to scrollbar */
if (ta->drag_info.data.scrollbar == ta->bar_x) {
x -= ta->border_width;
y -= ta->vis_height - ta->border_width -
SCROLLBAR_WIDTH;
} else {
x -= ta->vis_width - ta->border_width -
SCROLLBAR_WIDTH;
y -= ta->border_width;
}
scrollbar_mouse_action(ta->drag_info.data.scrollbar,
mouse, x, y);
return true;
}
/* Horizontal scrollbar */
if (ta->bar_x != NULL && ta->drag_info.type == TEXTAREA_DRAG_NONE) {
/* No drag happening, but mouse input is over scrollbar;
* pass input to scrollbar */
sx = x - ta->border_width;
sy = y - (ta->vis_height - ta->border_width - SCROLLBAR_WIDTH);
sl = ta->vis_width - 2 * ta->border_width -
(ta->bar_y != NULL ? SCROLLBAR_WIDTH : 0);
if (sx >= 0 && sy >= 0 && sx < sl && sy < SCROLLBAR_WIDTH) {
scrollbar_mouse_action(ta->bar_x, mouse, sx, sy);
return true;
}
}
/* Vertical scrollbar */
if (ta->bar_y != NULL && ta->drag_info.type == TEXTAREA_DRAG_NONE) {
/* No drag happening, but mouse input is over scrollbar;
* pass input to scrollbar */
sx = x - (ta->vis_width - ta->border_width - SCROLLBAR_WIDTH);
sy = y - ta->border_width;
sl = ta->vis_height - 2 * ta->border_width;
if (sx >= 0 && sy >= 0 && sx < SCROLLBAR_WIDTH && sy < sl) {
scrollbar_mouse_action(ta->bar_y, mouse, sx, sy);
return true;
}
}
/* Mouse action is textarea's responsibility */
if (mouse & BROWSER_MOUSE_DOUBLE_CLICK) {
/* Select word */
textarea_set_caret_xy(ta, x, y);
return textarea_select_fragment(ta);
} else if (mouse & BROWSER_MOUSE_TRIPLE_CLICK) {
/* Select paragraph */
textarea_set_caret_xy(ta, x, y);
return textarea_select_paragraph(ta);
} else if (mouse & BROWSER_MOUSE_PRESS_1) {
if (!(ta->flags & TEXTAREA_READONLY)) {
/* Place caret */
textarea_get_xy_offset(ta, x, y, &c_off);
ta->drag_start_char = c_off;
textarea_set_caret(ta, c_off);
}
if (ta->sel_start != -1) {
/* Clear selection */
textarea_clear_selection(ta);
}
} else if (mouse & BROWSER_MOUSE_PRESS_2) {
c_start = textarea_get_caret(ta);
textarea_get_xy_offset(ta, x, y, &c_off);
if (ta->sel_start != -1) {
/* Adjust selection */
c_start = (ta->sel_end - ta->sel_start) / 2 +
ta->sel_start;
c_start = ((unsigned)c_start > c_off) ?
ta->sel_end : ta->sel_start;
ta->drag_start_char = c_start;
return textarea_select(ta, c_start, c_off, false);
} else {
/* Select to caret */
ta->drag_start_char = c_start;
return textarea_select(ta, c_start, c_off, false);
}
} else if (mouse & (BROWSER_MOUSE_DRAG_1 | BROWSER_MOUSE_DRAG_2)) {
/* Selection start */
textarea_get_xy_offset(ta, x, y, &c_off);
c_start = ta->drag_start_char;
c_end = c_off;
ta->drag_info.type = TEXTAREA_DRAG_SELECTION;
msg.ta = ta;
msg.type = TEXTAREA_MSG_DRAG_REPORT;
msg.data.drag = ta->drag_info.type;
ta->callback(ta->data, &msg);
return textarea_select(ta, c_start, c_end, false);
} else if (mouse &
(BROWSER_MOUSE_HOLDING_1 | BROWSER_MOUSE_HOLDING_2) &&
ta->drag_info.type == TEXTAREA_DRAG_SELECTION) {
/* Selection track */
int scrx = 0;
int scry = 0;
bool need_redraw;
textarea_get_xy_offset(ta, x, y, &c_off);
c_start = ta->drag_start_char;
c_end = c_off;
/* selection auto-scroll */
if (x < 0)
scrx = x / 4;
else if (x > ta->vis_width)
scrx = (x - ta->vis_width) / 4;
if (y < 0)
scry = y / 4;
else if (y > ta->vis_height)
scry = (y - ta->vis_height) / 4;
need_redraw = textarea_scroll(ta, scrx, scry);
return textarea_select(ta, c_start, c_end, need_redraw);
}
return true;
}
/* exported interface, documented in textarea.h */
bool textarea_clear_selection(struct textarea *ta)
{
struct textarea_msg msg;
if (ta->sel_start == -1)
/* No selection to clear */
return false;
/* Clear selection and redraw */
ta->sel_start = ta->sel_end = -1;
msg.ta = ta;
msg.type = TEXTAREA_MSG_REDRAW_REQUEST;
msg.data.redraw.x0 = 0;
msg.data.redraw.y0 = 0;
msg.data.redraw.x1 = ta->vis_width;
msg.data.redraw.y1 = ta->vis_height;
ta->callback(ta->data, &msg);
/* No more selection */
msg.type = TEXTAREA_MSG_SELECTION_REPORT;
msg.data.selection.have_selection = false;
msg.data.selection.read_only = (ta->flags & TEXTAREA_READONLY);
ta->callback(ta->data, &msg);
if (!(ta->flags & TEXTAREA_INTERNAL_CARET)) {
/* Tell client where caret should be placed */
msg.ta = ta;
msg.type = TEXTAREA_MSG_CARET_UPDATE;
msg.data.caret.type = TEXTAREA_CARET_SET_POS;
msg.data.caret.pos.x = ta->caret_x - ta->scroll_x;
msg.data.caret.pos.y = ta->caret_y - ta->scroll_y;
msg.data.caret.pos.height = ta->line_height;
msg.data.caret.pos.clip = NULL;
ta->callback(ta->data, &msg);
}
return true;
}
/* exported interface, documented in textarea.h */
char *textarea_get_selection(struct textarea *ta)
{
char *ret;
size_t b_start, b_end, b_len;
if (ta->sel_start == -1)
/* No selection get */
return NULL;
textarea_char_to_byte_offset(ta->show, ta->sel_start, ta->sel_end,
&b_start, &b_end);
b_len = b_end - b_start;
if (b_len == 0)
/* No selection get */
return NULL;
ret = malloc(b_len + 1); /* Add space for '\0' */
if (ret == NULL)
/* Can't get selection; no memory */
return NULL;
memcpy(ret, ta->show->data + b_start, b_len);
ret[b_len] = '\0';
return ret;
}
/* exported interface, documented in textarea.h */
void textarea_get_dimensions(struct textarea *ta, int *width, int *height)
{
if (width != NULL)
*width = ta->vis_width;
if (height != NULL)
*height = ta->vis_height;
}
/* exported interface, documented in textarea.h */
void textarea_set_dimensions(struct textarea *ta, int width, int height)
{
ta->vis_width = width;
ta->vis_height = height;
textarea_setup_text_offsets(ta);
textarea_reflow(ta, 0);
}
/* exported interface, documented in textarea.h */
void textarea_set_layout(struct textarea *ta, int width, int height,
int top, int right, int bottom, int left)
{
ta->vis_width = width;
ta->vis_height = height;
ta->pad_top = top;
ta->pad_right = right + ((ta->bar_y == NULL) ? 0 : SCROLLBAR_WIDTH);
ta->pad_bottom = bottom + ((ta->bar_x == NULL) ? 0 : SCROLLBAR_WIDTH);
ta->pad_left = left;
textarea_setup_text_offsets(ta);
textarea_reflow(ta, 0);
}
/* exported interface, documented in textarea.h */
bool textarea_scroll(struct textarea *ta, int scrx, int scry)
{
bool handled_scroll = false;
if (ta->flags & TEXTAREA_MULTILINE) {
/* Multi line textareas have scrollbars to handle this */
if (ta->bar_x != NULL && scrx != 0 &&
scrollbar_scroll(ta->bar_x, scrx))
handled_scroll = true;
if (ta->bar_y != NULL && scry != 0 &&
scrollbar_scroll(ta->bar_y, scry))
handled_scroll = true;
} else {
/* Single line. Can only scroll horizontally. */
int xs = ta->scroll_x;
/* Apply offset */
xs += scrx;
/* Clamp to limits */
if (xs < 0)
xs = 0;
else if (xs > ta->h_extent - ta->vis_width)
xs = ta->h_extent - ta->vis_width;
if (xs != ta->scroll_x) {
ta->scroll_x = xs;
handled_scroll = true;
}
}
return handled_scroll;
}
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