mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-24 07:19:37 +03:00
1087 lines
26 KiB
C
1087 lines
26 KiB
C
/*
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* Copyright 2005 Adrian Lees <adrianl@users.sourceforge.net>
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* Copyright 2008 Michael Drake <tlsa@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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* Text selection within browser windows (implementation).
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <dom/dom.h>
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#include "desktop/browser_private.h"
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#include "desktop/gui.h"
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#include "desktop/mouse.h"
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#include "desktop/plotters.h"
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#include "desktop/save_text.h"
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#include "desktop/selection.h"
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#include "render/box.h"
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#include "render/font.h"
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#include "render/form.h"
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#include "render/html_internal.h"
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#include "render/textplain.h"
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#include "utils/log.h"
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#include "utils/utf8.h"
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#include "utils/utils.h"
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/**
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* Text selection works by labelling each node in the box tree with its
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* start index in the textual representation of the tree's content.
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*/
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#define SPACE_LEN(b) ((b->space == 0) ? 0 : 1)
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struct rdw_info {
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bool inited;
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struct rect r;
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};
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struct selection_string {
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char *buffer;
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size_t buffer_len;
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size_t length;
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int n_styles;
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nsclipboard_styles *styles;
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};
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typedef bool (*seln_traverse_handler)(const char *text, size_t length,
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struct box *box, void *handle, const char *whitespace_text,
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size_t whitespace_length);
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static bool redraw_handler(const char *text, size_t length, struct box *box,
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void *handle, const char *whitespace_text,
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size_t whitespace_length);
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static void selection_redraw(struct selection *s, unsigned start_idx,
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unsigned end_idx);
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static bool selected_part(struct box *box, unsigned start_idx, unsigned end_idx,
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unsigned *start_offset, unsigned *end_offset);
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static bool traverse_tree(struct box *box, unsigned start_idx, unsigned end_idx,
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seln_traverse_handler handler,
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void *handle, save_text_whitespace *before, bool *first,
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bool do_marker);
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static struct box *get_box(struct box *b, unsigned offset, size_t *pidx);
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/**
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* Get the browser window containing the content a selection object belongs to.
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*
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* \param s selection object
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* \return the browser window
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*/
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static struct browser_window * selection_get_browser_window(struct selection *s)
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{
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if (s->is_html)
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return html_get_browser_window(s->c);
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else
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return textplain_get_browser_window(s->c);
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}
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/**
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* Creates a new selection object associated with a browser window.
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*
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* \return new selection context
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*/
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struct selection *selection_create(struct content *c, bool is_html)
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{
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struct selection *s = calloc(1, sizeof(struct selection));
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if (s) {
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selection_prepare(s, c, is_html);
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}
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return s;
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}
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/**
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* Prepare a newly created selection object for use.
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*
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* \param s selection object
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* \param c content
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* \param is_html true if content is html false if content is textplain
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*/
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void selection_prepare(struct selection *s, struct content *c, bool is_html)
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{
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if (s) {
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s->c = c;
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s->is_html = is_html;
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s->root = NULL;
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s->drag_state = DRAG_NONE;
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s->max_idx = 0;
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selection_clear(s, false);
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}
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}
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/**
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* Destroys a selection object, without updating the
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* owning window (caller should call selection_clear()
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* first if update is desired)
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*
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* \param s selection object
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*/
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void selection_destroy(struct selection *s)
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{
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if (s != NULL)
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free(s);
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}
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/**
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* Initialise the selection object to use the given box subtree as its root,
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* ie. selections are confined to that subtree, whilst maintaining the current
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* selection whenever possible because, for example, it's just the page being
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* resized causing the layout to change.
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*
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* \param s selection object
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* \param root the root box for html document or NULL for text/plain
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*/
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void selection_reinit(struct selection *s, struct box *root)
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{
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unsigned root_idx;
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assert(s);
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root_idx = 0;
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s->root = root;
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if (root) {
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s->max_idx = selection_label_subtree(root, root_idx);
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} else {
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if (s->is_html == false)
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s->max_idx = textplain_size(s->c);
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else
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s->max_idx = 0;
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}
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if (s->defined) {
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if (s->end_idx > s->max_idx) s->end_idx = s->max_idx;
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if (s->start_idx > s->max_idx) s->start_idx = s->max_idx;
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s->defined = (s->end_idx > s->start_idx);
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}
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}
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/**
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* Initialise the selection object to use the given box subtree as its root,
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* ie. selections are confined to that subtree.
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*
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* \param s selection object
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* \param root the root box for html document or NULL for text/plain
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*/
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void selection_init(struct selection *s, struct box *root)
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{
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if (s->defined)
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selection_clear(s, true);
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s->defined = false;
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s->start_idx = 0;
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s->end_idx = 0;
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s->drag_state = DRAG_NONE;
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selection_reinit(s, root);
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}
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/**
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* Indicate whether the selected text is read only, ie. cannot be modified.
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*
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* \param s selection object
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* \return true iff the selection is read only
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*/
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bool selection_read_only(struct selection *s)
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{
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return true;
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}
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/**
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* Label each text box in the given box subtree with its position
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* in a textual representation of the content.
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*
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* \param s selection object
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* \param node box at root of subtree
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* \param idx current position within textual representation
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* \return updated position
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*/
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unsigned selection_label_subtree(struct box *box, unsigned idx)
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{
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struct box *child = box->children;
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box->byte_offset = idx;
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if (box->text)
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idx += box->length + SPACE_LEN(box);
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while (child) {
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if (child->list_marker)
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idx = selection_label_subtree(child->list_marker, idx);
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idx = selection_label_subtree(child, idx);
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child = child->next;
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}
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return idx;
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}
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/**
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* Handles mouse clicks (including drag starts) in or near a selection
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*
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* \param s selection object
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* \param mouse state of mouse buttons and modifier keys
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* \param idx byte offset within textual representation
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*
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* \return true iff the click has been handled by the selection code
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*/
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bool selection_click(struct selection *s, browser_mouse_state mouse,
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unsigned idx)
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{
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browser_mouse_state modkeys =
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(mouse & (BROWSER_MOUSE_MOD_1 | BROWSER_MOUSE_MOD_2));
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int pos = -1; /* 0 = inside selection, 1 = after it */
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struct browser_window *top = selection_get_browser_window(s);
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top = browser_window_get_root(top);
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if (selection_defined(s)) {
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if (idx > s->start_idx) {
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if (idx <= s->end_idx)
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pos = 0;
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else
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pos = 1;
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}
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}
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if (!pos &&
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((mouse & BROWSER_MOUSE_DRAG_1) ||
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(modkeys && (mouse & BROWSER_MOUSE_DRAG_2)))) {
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/* drag-saving selection */
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gui_drag_save_selection(s, top->window);
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}
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else if (!modkeys) {
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if (pos && (mouse & BROWSER_MOUSE_PRESS_1)) {
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/* Clear the selection if mouse is pressed outside the
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* selection, Otherwise clear on release (to allow for drags) */
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selection_clear(s, true);
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} else if (mouse & BROWSER_MOUSE_DRAG_1) {
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/* start new selection drag */
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selection_clear(s, true);
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selection_set_start(s, idx);
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selection_set_end(s, idx);
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s->drag_state = DRAG_END;
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gui_start_selection(top->window);
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}
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else if (mouse & BROWSER_MOUSE_DRAG_2) {
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/* adjust selection, but only if there is one */
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if (!selection_defined(s))
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return false; /* ignore Adjust drags */
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if (pos >= 0) {
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selection_set_end(s, idx);
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s->drag_state = DRAG_END;
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}
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else {
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selection_set_start(s, idx);
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s->drag_state = DRAG_START;
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}
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gui_start_selection(top->window);
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}
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else if (mouse & BROWSER_MOUSE_CLICK_2) {
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/* ignore Adjust clicks when there's no selection */
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if (!selection_defined(s))
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return false;
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if (pos >= 0)
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selection_set_end(s, idx);
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else
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selection_set_start(s, idx);
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s->drag_state = DRAG_NONE;
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}
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else
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return false;
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}
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else {
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/* not our problem */
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return false;
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}
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/* this mouse click is selection-related */
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return true;
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}
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/**
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* Handles movements related to the selection, eg. dragging of start and
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* end points.
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*
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* \param s selection object
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* \param mouse state of mouse buttons and modifier keys
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* \param idx byte offset within text representation
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*/
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void selection_track(struct selection *s, browser_mouse_state mouse,
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unsigned idx)
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{
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if (!mouse) {
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s->drag_state = DRAG_NONE;
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}
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switch (s->drag_state) {
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case DRAG_START:
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if (idx > s->end_idx) {
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unsigned old_end = s->end_idx;
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selection_set_end(s, idx);
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selection_set_start(s, old_end);
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s->drag_state = DRAG_END;
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}
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else
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selection_set_start(s, idx);
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break;
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case DRAG_END:
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if (idx < s->start_idx) {
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unsigned old_start = s->start_idx;
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selection_set_start(s, idx);
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selection_set_end(s, old_start);
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s->drag_state = DRAG_START;
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}
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else
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selection_set_end(s, idx);
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break;
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default:
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break;
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}
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}
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/**
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* Tests whether a text box lies partially within the given range of
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* byte offsets, returning the start and end indexes of the bytes
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* that are enclosed.
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*
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* \param box box to be tested
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* \param start_idx byte offset of start of range
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* \param end_idx byte offset of end of range
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* \param start_offset receives the start offset of the selected part
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* \param end_offset receives the end offset of the selected part
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* \return true iff the range encloses at least part of the box
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*/
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bool selected_part(struct box *box, unsigned start_idx, unsigned end_idx,
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unsigned *start_offset, unsigned *end_offset)
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{
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size_t box_length = box->length + SPACE_LEN(box);
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if (box_length > 0) {
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if (box->byte_offset >= start_idx &&
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box->byte_offset + box_length <= end_idx) {
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/* fully enclosed */
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*start_offset = 0;
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*end_offset = box_length;
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return true;
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}
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else if (box->byte_offset + box_length > start_idx &&
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box->byte_offset < end_idx) {
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/* partly enclosed */
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int offset = 0;
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int len;
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if (box->byte_offset < start_idx)
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offset = start_idx - box->byte_offset;
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len = box_length - offset;
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if (box->byte_offset + box_length > end_idx)
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len = end_idx - (box->byte_offset + offset);
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*start_offset = offset;
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*end_offset = offset + len;
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return true;
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}
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}
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return false;
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}
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/**
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* Traverse the given box subtree, calling the handler function (with its handle)
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* for all boxes that lie (partially) within the given range
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*
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* \param box box subtree
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* \param start_idx start of range within textual representation (bytes)
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* \param end_idx end of range
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* \param handler handler function to call
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* \param handle handle to pass
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* \param before type of whitespace to place before next encountered text
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* \param first whether this is the first box with text
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* \param do_marker whether deal enter any marker box
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* \return false iff traversal abandoned part-way through
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*/
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bool traverse_tree(struct box *box, unsigned start_idx, unsigned end_idx,
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seln_traverse_handler handler,
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void *handle, save_text_whitespace *before, bool *first,
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bool do_marker)
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{
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struct box *child;
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const char *whitespace_text = "";
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size_t whitespace_length = 0;
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assert(box);
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/* If selection starts inside marker */
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if (box->parent && box->parent->list_marker == box && !do_marker) {
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/* set box to main list element */
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box = box->parent;
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}
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/* If box has a list marker */
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if (box->list_marker) {
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/* do the marker box before continuing with the rest of the
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* list element */
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if (!traverse_tree(box->list_marker, start_idx, end_idx,
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handler, handle, before, first,
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true))
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return false;
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}
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/* we can prune this subtree, it's after the selection */
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if (box->byte_offset >= end_idx)
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return true;
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/* read before calling the handler in case it modifies the tree */
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child = box->children;
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/* If nicely formatted output of the selected text is required, work
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* out what whitespace should be placed before the next bit of text */
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if (before) {
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save_text_solve_whitespace(box, first, before, &whitespace_text,
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&whitespace_length);
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}
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else {
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whitespace_text = NULL;
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}
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if (box->type != BOX_BR &&
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!((box->type == BOX_FLOAT_LEFT ||
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box->type == BOX_FLOAT_RIGHT) &&
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!box->text)) {
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unsigned start_offset;
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unsigned end_offset;
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if (selected_part(box, start_idx, end_idx, &start_offset,
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&end_offset)) {
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if (!handler(box->text + start_offset, min(box->length,
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end_offset) - start_offset,
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box, handle, whitespace_text,
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whitespace_length))
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return false;
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if (before) {
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*first = false;
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*before = WHITESPACE_NONE;
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}
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}
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}
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/* find the first child that could lie partially within the selection;
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* this is important at the top-levels of the tree for pruning subtrees
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* that lie entirely before the selection */
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if (child) {
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struct box *next = child->next;
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while (next && next->byte_offset < start_idx) {
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child = next;
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next = child->next;
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}
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while (child) {
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/* read before calling the handler in case it modifies
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* the tree */
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struct box *next = child->next;
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if (!traverse_tree(child, start_idx, end_idx,
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handler, handle, before, first, false))
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return false;
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child = next;
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}
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}
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return true;
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}
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/**
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* Traverse the current selection, calling the handler function (with its
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* handle) for all boxes that lie (partially) within the given range
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*
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* \param handler handler function to call
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* \param handle handle to pass
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* \return false iff traversal abandoned part-way through
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*/
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static bool selection_traverse(struct selection *s,
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seln_traverse_handler handler, void *handle)
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{
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save_text_whitespace before = WHITESPACE_NONE;
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bool first = true;
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const char *text;
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size_t length;
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|
|
|
if (!selection_defined(s))
|
|
return true; /* easy case, nothing to do */
|
|
|
|
if (s->root) {
|
|
/* HTML */
|
|
return traverse_tree(s->root, s->start_idx, s->end_idx,
|
|
handler, handle, &before, &first, false);
|
|
}
|
|
|
|
/* Text */
|
|
text = textplain_get_raw_data(s->c, s->start_idx, s->end_idx, &length);
|
|
|
|
if (text && !handler(text, length, NULL, handle, NULL, 0))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/**
|
|
* Selection traversal handler for redrawing the screen when the selection
|
|
* has been altered.
|
|
*
|
|
* \param text pointer to text string
|
|
* \param length length of text to be appended (bytes)
|
|
* \param box pointer to text box being (partially) added
|
|
* \param handle unused handle, we don't need one
|
|
* \param whitespace_text whitespace to place before text for formatting
|
|
* may be NULL
|
|
* \param whitespace_length length of whitespace_text
|
|
* \return true iff successful and traversal should continue
|
|
*/
|
|
|
|
bool redraw_handler(const char *text, size_t length, struct box *box,
|
|
void *handle, const char *whitespace_text,
|
|
size_t whitespace_length)
|
|
{
|
|
if (box) {
|
|
struct rdw_info *r = (struct rdw_info*)handle;
|
|
int width, height;
|
|
int x, y;
|
|
plot_font_style_t fstyle;
|
|
|
|
font_plot_style_from_css(box->style, &fstyle);
|
|
|
|
/* \todo - it should be possible to reduce the redrawn area by
|
|
* considering the 'text', 'length' and 'space' parameters */
|
|
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 (r->inited) {
|
|
if (x < r->r.x0) r->r.x0 = x;
|
|
if (y < r->r.y0) r->r.y0 = y;
|
|
if (x + width > r->r.x1) r->r.x1 = x + width;
|
|
if (y + height > r->r.y1) r->r.y1 = y + height;
|
|
}
|
|
else {
|
|
r->inited = true;
|
|
r->r.x0 = x;
|
|
r->r.y0 = y;
|
|
r->r.x1 = x + width;
|
|
r->r.y1 = y + height;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
/**
|
|
* Redraws the given range of text.
|
|
*
|
|
* \param s selection object
|
|
* \param start_idx start offset (bytes) within the textual representation
|
|
* \param end_idx end offset (bytes) within the textual representation
|
|
*/
|
|
|
|
void selection_redraw(struct selection *s, unsigned start_idx, unsigned end_idx)
|
|
{
|
|
struct rdw_info rdw;
|
|
|
|
assert(end_idx >= start_idx);
|
|
rdw.inited = false;
|
|
|
|
if (s->root) {
|
|
if (!traverse_tree(s->root, start_idx, end_idx,
|
|
redraw_handler, &rdw,
|
|
NULL, NULL, false))
|
|
return;
|
|
}
|
|
else {
|
|
if (s->is_html == false && end_idx > start_idx) {
|
|
textplain_coords_from_range(s->c, start_idx,
|
|
end_idx, &rdw.r);
|
|
rdw.inited = true;
|
|
}
|
|
}
|
|
|
|
if (rdw.inited)
|
|
content__request_redraw(s->c, rdw.r.x0, rdw.r.y0,
|
|
rdw.r.x1 - rdw.r.x0, rdw.r.y1 - rdw.r.y0);
|
|
}
|
|
|
|
|
|
/**
|
|
* Append text to selection string.
|
|
*
|
|
* \param text text to be added
|
|
* \param length length of text in bytes
|
|
* \param space indicates whether a trailing space should be appended
|
|
* \param sel_string string to append to, may be resized
|
|
* \return true iff successful
|
|
*/
|
|
|
|
static bool selection_string_append(const char *text, size_t length, bool space,
|
|
plot_font_style_t *style, struct selection_string *sel_string)
|
|
{
|
|
size_t new_length = sel_string->length + length + (space ? 1 : 0) + 1;
|
|
|
|
if (style != NULL) {
|
|
/* Add text run style */
|
|
nsclipboard_styles *new_styles;
|
|
|
|
if (sel_string->n_styles == 0)
|
|
assert(sel_string->length == 0);
|
|
|
|
new_styles = realloc(sel_string->styles,
|
|
(sel_string->n_styles + 1) *
|
|
sizeof(nsclipboard_styles));
|
|
if (new_styles == NULL)
|
|
return false;
|
|
|
|
sel_string->styles = new_styles;
|
|
|
|
sel_string->styles[sel_string->n_styles].style = *style;
|
|
sel_string->styles[sel_string->n_styles].start =
|
|
sel_string->length;
|
|
|
|
sel_string->n_styles++;
|
|
}
|
|
|
|
if (new_length > sel_string->buffer_len) {
|
|
/* Need to extend buffer */
|
|
size_t new_alloc = new_length + (new_length / 4);
|
|
char *new_buff;
|
|
|
|
new_buff = realloc(sel_string->buffer, new_alloc);
|
|
if (new_buff == NULL)
|
|
return false;
|
|
|
|
sel_string->buffer = new_buff;
|
|
sel_string->buffer_len = new_alloc;
|
|
}
|
|
|
|
/* Copy text onto end of existing text in buffer */
|
|
memcpy(sel_string->buffer + sel_string->length, text, length);
|
|
sel_string->length += length;
|
|
|
|
if (space)
|
|
sel_string->buffer[sel_string->length++] = ' ';
|
|
|
|
/* Ensure NULL termination */
|
|
sel_string->buffer[sel_string->length] = '\0';
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/**
|
|
* Selection traversal routine for appending text to a string
|
|
*
|
|
* \param text pointer to text being added, or NULL for newline
|
|
* \param length length of text to be appended (bytes)
|
|
* \param box pointer to text box, or NULL if from textplain
|
|
* \param handle selection string to append to
|
|
* \param whitespace_text whitespace to place before text for formatting
|
|
* may be NULL
|
|
* \param whitespace_length length of whitespace_text
|
|
* \return true iff successful and traversal should continue
|
|
*/
|
|
|
|
static bool selection_copy_handler(const char *text, size_t length,
|
|
struct box *box, void *handle, const char *whitespace_text,
|
|
size_t whitespace_length)
|
|
{
|
|
bool add_space = false;
|
|
plot_font_style_t style;
|
|
plot_font_style_t *pstyle = NULL;
|
|
|
|
/* add any whitespace which precedes the text from this box */
|
|
if (whitespace_text != NULL && whitespace_length > 0) {
|
|
if (!selection_string_append(whitespace_text,
|
|
whitespace_length, false, pstyle, handle)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (box != NULL) {
|
|
/* HTML */
|
|
add_space = (box->space != 0);
|
|
|
|
if (box->style != NULL) {
|
|
/* Override default font style */
|
|
font_plot_style_from_css(box->style, &style);
|
|
pstyle = &style;
|
|
} else {
|
|
/* If there's no style, there must be no text */
|
|
assert(box->text == NULL);
|
|
}
|
|
}
|
|
|
|
/* add the text from this box */
|
|
if (!selection_string_append(text, length, add_space, pstyle, handle))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/**
|
|
* Get copy of selection as string
|
|
*
|
|
* \param s selection
|
|
* \return string of selected text, or NULL. Ownership passed to caller.
|
|
*/
|
|
|
|
char *selection_get_copy(struct selection *s)
|
|
{
|
|
struct selection_string sel_string = {
|
|
.buffer = NULL,
|
|
.buffer_len = 0,
|
|
.length = 0,
|
|
|
|
.n_styles = 0,
|
|
.styles = NULL
|
|
};
|
|
|
|
if (s == NULL || !s->defined)
|
|
return NULL;
|
|
|
|
if (!selection_traverse(s, selection_copy_handler, &sel_string)) {
|
|
free(sel_string.buffer);
|
|
free(sel_string.styles);
|
|
return NULL;
|
|
}
|
|
|
|
free(sel_string.styles);
|
|
|
|
return sel_string.buffer;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Copy the selected contents to the clipboard
|
|
*
|
|
* \param s selection
|
|
* \return true iff successful
|
|
*/
|
|
bool selection_copy_to_clipboard(struct selection *s)
|
|
{
|
|
struct selection_string sel_string = {
|
|
.buffer = NULL,
|
|
.buffer_len = 0,
|
|
.length = 0,
|
|
|
|
.n_styles = 0,
|
|
.styles = NULL
|
|
};
|
|
|
|
if (s == NULL || !s->defined)
|
|
return false;
|
|
|
|
if (!selection_traverse(s, selection_copy_handler, &sel_string)) {
|
|
free(sel_string.buffer);
|
|
free(sel_string.styles);
|
|
return false;
|
|
}
|
|
|
|
gui_set_clipboard(sel_string.buffer, sel_string.length,
|
|
sel_string.styles, sel_string.n_styles);
|
|
|
|
free(sel_string.buffer);
|
|
free(sel_string.styles);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/**
|
|
* Clears the current selection, optionally causing the screen to be updated.
|
|
*
|
|
* \param s selection object
|
|
* \param redraw true iff the previously selected region of the browser
|
|
* window should be redrawn
|
|
*/
|
|
|
|
void selection_clear(struct selection *s, bool redraw)
|
|
{
|
|
int old_start, old_end;
|
|
bool was_defined;
|
|
|
|
assert(s);
|
|
was_defined = selection_defined(s);
|
|
old_start = s->start_idx;
|
|
old_end = s->end_idx;
|
|
|
|
s->defined = false;
|
|
s->start_idx = 0;
|
|
s->end_idx = 0;
|
|
|
|
if (redraw && was_defined)
|
|
selection_redraw(s, old_start, old_end);
|
|
}
|
|
|
|
|
|
/**
|
|
* Selects all the text within the box subtree controlled by
|
|
* this selection object, updating the screen accordingly.
|
|
*
|
|
* \param s selection object
|
|
*/
|
|
|
|
void selection_select_all(struct selection *s)
|
|
{
|
|
assert(s);
|
|
s->defined = true;
|
|
|
|
selection_set_start(s, 0);
|
|
selection_set_end(s, s->max_idx);
|
|
}
|
|
|
|
|
|
/**
|
|
* Set the start position of the current selection, updating the screen.
|
|
*
|
|
* \param s selection object
|
|
* \param offset byte offset within textual representation
|
|
*/
|
|
|
|
void selection_set_start(struct selection *s, unsigned offset)
|
|
{
|
|
bool was_defined = selection_defined(s);
|
|
unsigned old_start = s->start_idx;
|
|
|
|
s->start_idx = offset;
|
|
s->defined = (s->start_idx < s->end_idx);
|
|
|
|
if (was_defined) {
|
|
if (offset < old_start)
|
|
selection_redraw(s, s->start_idx, old_start);
|
|
else
|
|
selection_redraw(s, old_start, s->start_idx);
|
|
}
|
|
else if (selection_defined(s))
|
|
selection_redraw(s, s->start_idx, s->end_idx);
|
|
}
|
|
|
|
|
|
/**
|
|
* Set the end position of the current selection, updating the screen.
|
|
*
|
|
* \param s selection object
|
|
* \param offset byte offset within textual representation
|
|
*/
|
|
|
|
void selection_set_end(struct selection *s, unsigned offset)
|
|
{
|
|
bool was_defined = selection_defined(s);
|
|
unsigned old_end = s->end_idx;
|
|
|
|
s->end_idx = offset;
|
|
s->defined = (s->start_idx < s->end_idx);
|
|
|
|
if (was_defined) {
|
|
if (offset < old_end)
|
|
selection_redraw(s, s->end_idx, old_end);
|
|
else
|
|
selection_redraw(s, old_end, s->end_idx);
|
|
}
|
|
else if (selection_defined(s))
|
|
selection_redraw(s, s->start_idx, s->end_idx);
|
|
}
|
|
|
|
|
|
/**
|
|
* Get the box and index of the specified byte offset within the
|
|
* textual representation.
|
|
*
|
|
* \param b root node of search
|
|
* \param offset byte offset within textual representation
|
|
* \param pidx receives byte index of selection start point within box
|
|
* \return ptr to box, or NULL if no selection defined
|
|
*/
|
|
|
|
struct box *get_box(struct box *b, unsigned offset, size_t *pidx)
|
|
{
|
|
struct box *child = b->children;
|
|
|
|
if (b->text) {
|
|
|
|
if (offset >= b->byte_offset &&
|
|
offset <= b->byte_offset + b->length + SPACE_LEN(b)) {
|
|
|
|
/* it's in this box */
|
|
*pidx = offset - b->byte_offset;
|
|
return b;
|
|
}
|
|
}
|
|
|
|
/* find the first child that could contain this offset */
|
|
if (child) {
|
|
struct box *next = child->next;
|
|
while (next && next->byte_offset < offset) {
|
|
child = next;
|
|
next = child->next;
|
|
}
|
|
return get_box(child, offset, pidx);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/**
|
|
* Get the box and index of the selection start, if defined.
|
|
*
|
|
* \param s selection object
|
|
* \param pidx receives byte index of selection start point within box
|
|
* \return ptr to box, or NULL if no selection defined
|
|
*/
|
|
|
|
struct box *selection_get_start(struct selection *s, size_t *pidx)
|
|
{
|
|
return (s->defined ? get_box(s->root, s->start_idx, pidx) : NULL);
|
|
}
|
|
|
|
|
|
/**
|
|
* Get the box and index of the selection end, if defined.
|
|
*
|
|
* \param s selection object
|
|
* \param pidx receives byte index of selection end point within box
|
|
* \return ptr to box, or NULL if no selection defined.
|
|
*/
|
|
|
|
struct box *selection_get_end(struct selection *s, size_t *pidx)
|
|
{
|
|
return (s->defined ? get_box(s->root, s->end_idx, pidx) : NULL);
|
|
}
|
|
|
|
|
|
/**
|
|
* Tests whether a text range lies partially within the selection, if there is
|
|
* a selection defined, returning the start and end indexes of the bytes
|
|
* that should be selected.
|
|
*
|
|
* \param s the selection object
|
|
* \param start byte offset of start of text
|
|
* \param start_idx receives the start index (in bytes) of the highlighted portion
|
|
* \param end_idx receives the end index (in bytes)
|
|
* \return true iff part of the given box lies within the selection
|
|
*/
|
|
|
|
bool selection_highlighted(const struct selection *s,
|
|
unsigned start, unsigned end,
|
|
unsigned *start_idx, unsigned *end_idx)
|
|
{
|
|
/* caller should have checked first for efficiency */
|
|
assert(s);
|
|
assert(selection_defined(s));
|
|
|
|
if (end <= s->start_idx || start >= s->end_idx)
|
|
return false;
|
|
|
|
*start_idx = (s->start_idx >= start) ? (s->start_idx - start) : 0;
|
|
*end_idx = min(end, s->end_idx) - start;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/**
|
|
* Adjust the selection to reflect a change in the selected text,
|
|
* eg. editing in a text area/input field.
|
|
*
|
|
* \param s selection object
|
|
* \param byte_offset byte offset of insertion/removal point
|
|
* \param change byte size of change, +ve = insertion, -ve = removal
|
|
* \param redraw true iff the screen should be updated
|
|
*/
|
|
|
|
void selection_update(struct selection *s, size_t byte_offset,
|
|
int change, bool redraw)
|
|
{
|
|
if (selection_defined(s) &&
|
|
byte_offset >= s->start_idx &&
|
|
byte_offset < s->end_idx)
|
|
{
|
|
if (change > 0)
|
|
s->end_idx += change;
|
|
else
|
|
s->end_idx +=
|
|
max(change, (int)(byte_offset - s->end_idx));
|
|
}
|
|
}
|