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author | Vincent Sanders <vince@kyllikki.org> | 2020-05-23 18:39:25 +0100 |
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committer | Vincent Sanders <vince@kyllikki.org> | 2020-05-23 23:00:08 +0100 |
commit | 36b9262e1481fc24d302b58f03006e733b2e6d16 (patch) | |
tree | a2189e438023c837d8b8949b7c38e54fa143cab1 /content/handlers/html/textselection.c | |
parent | 0432d9556187d00fd7f78963afcefc4b7dd71f2a (diff) | |
download | netsurf-36b9262e1481fc24d302b58f03006e733b2e6d16.tar.gz netsurf-36b9262e1481fc24d302b58f03006e733b2e6d16.tar.bz2 |
split selection redraw into content handler specific implementations
Diffstat (limited to 'content/handlers/html/textselection.c')
-rw-r--r-- | content/handlers/html/textselection.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/content/handlers/html/textselection.c b/content/handlers/html/textselection.c new file mode 100644 index 000000000..bbd55732e --- /dev/null +++ b/content/handlers/html/textselection.c @@ -0,0 +1,303 @@ +/* + * Copyright 2006 James Bursa <bursa@users.sourceforge.net> + * Copyright 2006 Richard Wilson <info@tinct.net> + * Copyright 2008 Michael Drake <tlsa@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 + * implementation of user interaction with a CONTENT_HTML. + */ + +#include <assert.h> +#include <stdbool.h> + +#include <dom/dom.h> + +#include "utils/corestrings.h" +#include "utils/messages.h" +#include "utils/utils.h" +#include "utils/log.h" +#include "utils/nsoption.h" +#include "netsurf/content.h" +#include "netsurf/browser_window.h" +#include "netsurf/mouse.h" +#include "netsurf/misc.h" +#include "netsurf/layout.h" +#include "netsurf/keypress.h" +#include "content/hlcache.h" +#include "content/textsearch.h" +#include "desktop/frames.h" +#include "desktop/scrollbar.h" +#include "desktop/selection.h" +#include "desktop/textarea.h" +#include "javascript/js.h" +#include "desktop/gui_internal.h" +#include "desktop/save_text.h" + +#include "html/box.h" +#include "html/box_textarea.h" +#include "html/box_inspect.h" +#include "html/font.h" +#include "html/form_internal.h" +#include "html/private.h" +#include "html/imagemap.h" +#include "html/textselection.h" + +#define SPACE_LEN(b) ((b->space == 0) ? 0 : 1) + + + +struct rdw_info { + bool inited; + struct rect r; +}; + + + +/** + * Tests whether a text box lies partially within the given range of + * byte offsets, returning the start and end indexes of the bytes + * that are enclosed. + * + * \param box box to be tested + * \param start_idx byte offset of start of range + * \param end_idx byte offset of end of range + * \param start_offset receives the start offset of the selected part + * \param end_offset receives the end offset of the selected part + * \return true iff the range encloses at least part of the box + */ +static bool +selected_part(struct box *box, + unsigned start_idx, + unsigned end_idx, + unsigned *start_offset, + unsigned *end_offset) +{ + size_t box_length = box->length + SPACE_LEN(box); + + if (box_length > 0) { + if ((box->byte_offset >= start_idx) && + (box->byte_offset + box_length <= end_idx)) { + + /* fully enclosed */ + *start_offset = 0; + *end_offset = box_length; + return true; + } else if ((box->byte_offset + box_length > start_idx) && + (box->byte_offset < end_idx)) { + /* partly enclosed */ + int offset = 0; + int len; + + if (box->byte_offset < start_idx) { + offset = start_idx - box->byte_offset; + } + + len = box_length - offset; + + if (box->byte_offset + box_length > end_idx) { + len = end_idx - (box->byte_offset + offset); + } + + *start_offset = offset; + *end_offset = offset + len; + + return true; + } + } + return false; +} + + +/** + * Traverse the given box subtree, calling the handler function (with + * its handle) for all boxes that lie (partially) within the given + * range + * + * \param box box subtree + * \param start_idx start of range within textual representation (bytes) + * \param end_idx end of range + * \param rdwi redraw range to fill in + * \param do_marker whether deal enter any marker box + * \return false iff traversal abandoned part-way through + */ +static bool +coords_from_range(struct box *box, + unsigned start_idx, + unsigned end_idx, + struct rdw_info *rdwi, + bool do_marker) +{ + struct box *child; + + assert(box); + + /* If selection starts inside marker */ + if (box->parent && + box->parent->list_marker == box && + !do_marker) { + /* set box to main list element */ + box = box->parent; + } + + /* If box has a list marker */ + if (box->list_marker) { + /* do the marker box before continuing with the rest of the + * list element */ + if (!coords_from_range(box->list_marker, + start_idx, + end_idx, + rdwi, + true)) { + return false; + } + } + + /* we can prune this subtree, it's after the selection */ + if (box->byte_offset >= end_idx) { + return true; + } + + /* read before calling the handler in case it modifies the tree */ + child = box->children; + + if ((box->type != BOX_BR) && + !((box->type == BOX_FLOAT_LEFT || + box->type == BOX_FLOAT_RIGHT) && + !box->text)) { + unsigned start_offset; + unsigned end_offset; + + if (selected_part(box, start_idx, end_idx, &start_offset, &end_offset)) { + int width, height; + int x, y; + + /** + * \todo it should be possible to reduce the redrawn + * area using the offsets + */ + box_coords(box, &x, &y); + + width = box->padding[LEFT] + box->width + box->padding[RIGHT]; + height = box->padding[TOP] + box->height + box->padding[BOTTOM]; + + if ((box->type == BOX_TEXT) && + (box->space != 0)) { + width += box->space; + } + + if (rdwi->inited) { + if (x < rdwi->r.x0) { + rdwi->r.x0 = x; + } + if (y < rdwi->r.y0) { + rdwi->r.y0 = y; + } + if (x + width > rdwi->r.x1) { + rdwi->r.x1 = x + width; + } + if (y + height > rdwi->r.y1) { + rdwi->r.y1 = y + height; + } + } else { + rdwi->inited = true; + rdwi->r.x0 = x; + rdwi->r.y0 = y; + rdwi->r.x1 = x + width; + rdwi->r.y1 = y + height; + } + } + } + + /* find the first child that could lie partially within the selection; + * this is important at the top-levels of the tree for pruning subtrees + * that lie entirely before the selection */ + + if (child) { + struct box *next = child->next; + + while (next && next->byte_offset < start_idx) { + child = next; + next = child->next; + } + + while (child) { + /* read before calling the handler in case it modifies + * the tree */ + struct box *next = child->next; + + if (!coords_from_range(child, + start_idx, + end_idx, + rdwi, + false)) { + return false; + } + + child = next; + } + } + + return true; +} + + +/** + * create a selection object suitable for this content + */ +nserror +html_create_selection(struct content *c, struct selection **sel_out) +{ + html_content *html = (html_content *)c; + struct selection *sel; + sel = selection_create(c, true); + if (sel == NULL) { + return NSERROR_NOMEM; + } + + selection_init(sel, html->layout, &html->len_ctx); + + *sel_out = sel; + return NSERROR_OK; +} + +nserror +html_textselection_redraw(struct content *c, + unsigned start_idx, + unsigned end_idx) +{ + html_content *html = (html_content *)c; + struct rdw_info rdw; + + rdw.inited = false; + + if (!coords_from_range(html->layout, start_idx, end_idx, &rdw, false)) { + return NSERROR_BAD_PARAMETER; + } + + if (rdw.inited) { + content__request_redraw(c, + rdw.r.x0, + rdw.r.y0, + rdw.r.x1 - rdw.r.x0, + rdw.r.y1 - rdw.r.y0); + } + + return NSERROR_OK; +} |