netsurf/riscos/textselection.c

713 lines
17 KiB
C

/*
* Copyright 2005 Adrian Lees <adrianl@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
* Text selection code (platform-dependent implementation)
*/
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "oslib/osfile.h"
#include "oslib/wimp.h"
#include "content/hlcache.h"
#include "desktop/gui.h"
#include "desktop/selection.h"
#include "desktop/textinput.h"
#include "riscos/gui.h"
#include "riscos/message.h"
#include "riscos/save.h"
#include "riscos/textselection.h"
#include "render/form.h"
#include "utils/log.h"
#include "utils/utf8.h"
#include "utils/utils.h"
#ifndef wimp_DRAG_CLAIM_SUPPRESS_DRAGBOX
#define wimp_DRAG_CLAIM_SUPPRESS_DRAGBOX ((wimp_drag_claim_flags) 0x2u)
#endif
/** Receive of Dragging message has claimed it */
static bool dragging_claimed = false;
static wimp_t dragging_claimant;
static os_box dragging_box = { -34, -34, 34, 34 }; /* \todo - size properly */
static wimp_drag_claim_flags last_claim_flags = 0;
static struct gui_window *last_start_window;
static bool drag_claimed = false;
static bool owns_clipboard = false;
static bool owns_caret_and_selection = false;
/* current clipboard contents if we own the clipboard */
static char *clipboard = NULL;
static size_t clip_alloc = 0;
static size_t clip_length = 0;
static bool copy_handler(const char *text, size_t length, struct box *box,
void *handle, const char *whitespace_text,
size_t whitespace_length);
static void ro_gui_discard_clipboard_contents(void);
static void ro_gui_dragging_bounced(wimp_message *message);
/**
* Start drag-selecting text within a browser window (RO-dependent part)
*
* \param g gui window
*/
void gui_start_selection(struct gui_window *g)
{
wimp_full_message_claim_entity msg;
wimp_auto_scroll_info scroll;
wimp_window_state state;
wimp_drag drag;
os_error *error;
LOG(("starting text_selection drag"));
state.w = g->window;
error = xwimp_get_window_state(&state);
if (error) {
LOG(("xwimp_get_window_state 0x%x: %s",
error->errnum, error->errmess));
warn_user("WimpError", error->errmess);
return;
}
/* claim caret and selection */
msg.size = sizeof(msg);
msg.your_ref = 0;
msg.action = message_CLAIM_ENTITY;
msg.flags = wimp_CLAIM_CARET_OR_SELECTION;
error = xwimp_send_message(wimp_USER_MESSAGE,
(wimp_message*)&msg, wimp_BROADCAST);
if (error) {
LOG(("xwimp_send_message: 0x%x: %s",
error->errnum, error->errmess));
warn_user("WimpError", error->errmess);
}
owns_caret_and_selection = true;
scroll.w = g->window;
scroll.pause_zone_sizes.x0 = 80;
scroll.pause_zone_sizes.y0 = 80;
scroll.pause_zone_sizes.x1 = 80;
scroll.pause_zone_sizes.y1 = 80;
scroll.pause_duration = 0;
scroll.state_change = (void *)0;
error = xwimp_auto_scroll(wimp_AUTO_SCROLL_ENABLE_VERTICAL |
wimp_AUTO_SCROLL_ENABLE_HORIZONTAL,
&scroll, 0);
if (error)
LOG(("xwimp_auto_scroll: 0x%x: %s",
error->errnum, error->errmess));
gui_current_drag_type = GUI_DRAG_SELECTION;
gui_track_gui_window = g;
drag.type = wimp_DRAG_USER_POINT;
/* Don't constrain mouse pointer during drags */
drag.bbox.x0 = -16384;
drag.bbox.y0 = -16384;
drag.bbox.x1 = 16384;
drag.bbox.y1 = 16384;
error = xwimp_drag_box(&drag);
if (error) {
LOG(("xwimp_drag_box: 0x%x : %s",
error->errnum, error->errmess));
warn_user("WimpError", error->errmess);
}
last_start_window = g;
}
/**
* End of text selection drag operation
*
* \param g gui window
* \param dragged position of pointer at conclusion of drag
*/
void ro_gui_selection_drag_end(struct gui_window *g, wimp_dragged *drag)
{
wimp_auto_scroll_info scroll;
wimp_pointer pointer;
os_error *error;
os_coord pos;
LOG(("ending text selection drag"));
gui_current_drag_type = GUI_DRAG_NONE;
scroll.w = g->window;
error = xwimp_auto_scroll(0, &scroll, 0);
if (error)
LOG(("xwimp_auto_scroll: 0x%x: %s",
error->errnum, error->errmess));
error = xwimp_drag_box((wimp_drag*)-1);
if (error) {
LOG(("xwimp_drag_box: 0x%x : %s",
error->errnum, error->errmess));
warn_user("WimpError", error->errmess);
}
error = xwimp_get_pointer_info(&pointer);
if (error) {
LOG(("xwimp_get_pointer_info 0x%x : %s",
error->errnum, error->errmess));
warn_user("WimpError", error->errmess);
return;
}
if (ro_gui_window_to_window_pos(g, drag->final.x0, drag->final.y0, &pos))
browser_window_mouse_drag_end(g->bw,
ro_gui_mouse_click_state(pointer.buttons),
pos.x, pos.y);
}
/**
* Selection traversal routine for appending text to the current contents
* of the clipboard.
*
* \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 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 copy_handler(const char *text, size_t length, struct box *box,
void *handle, const char *whitespace_text,
size_t whitespace_length)
{
/* add any whitespace which precedes the text from this box */
if (whitespace_text) {
if (!gui_add_to_clipboard(whitespace_text,
whitespace_length, false)) {
return false;
}
}
/* add the text from this box */
if (!gui_add_to_clipboard(text, length, box->space))
return false;
return true;
}
/**
* Empty the clipboard, called prior to gui_add_to_clipboard and
* gui_commit_clipboard
*
* \return true iff successful
*/
bool gui_empty_clipboard(void)
{
const int init_size = 1024;
if (!clip_alloc) {
clipboard = malloc(init_size);
if (!clipboard) {
LOG(("out of memory"));
warn_user("NoMemory", 0);
return false;
}
clip_alloc = init_size;
}
clip_length = 0;
return true;
}
/**
* Add some text to the clipboard, optionally appending a trailing space.
*
* \param text text to be added
* \param length length of text in bytes
* \param space indicates whether a trailing space should be appended also
* \return true iff successful
*/
bool gui_add_to_clipboard(const char *text, size_t length, bool space)
{
size_t new_length = clip_length + length + (space ? 1 : 0);
if (new_length > clip_alloc) {
size_t new_alloc = clip_alloc + (clip_alloc / 4);
char *new_cb;
if (new_alloc < new_length) new_alloc = new_length;
new_cb = realloc(clipboard, new_alloc);
if (!new_cb) return false;
clipboard = new_cb;
clip_alloc = new_alloc;
}
memcpy(clipboard + clip_length, text, length);
clip_length += length;
if (space) clipboard[clip_length++] = ' ';
return true;
}
/**
* Commit the changes made by gui_empty_clipboard and gui_add_to_clipboard.
*
* \return true iff successful
*/
bool gui_commit_clipboard(void)
{
if (clip_length) {
utf8_convert_ret res;
char *new_cb;
res = utf8_to_local_encoding(clipboard, clip_length, &new_cb);
if (res == UTF8_CONVERT_OK) {
free(clipboard);
clipboard = new_cb;
/* \todo utf8_to_local_encoding should return the length! */
clip_alloc = clip_length = strlen(new_cb);
}
}
if (!owns_clipboard) {
wimp_full_message_claim_entity msg;
os_error *error;
LOG(("claiming clipboard"));
msg.size = sizeof(msg);
msg.your_ref = 0;
msg.action = message_CLAIM_ENTITY;
msg.flags = wimp_CLAIM_CLIPBOARD;
error = xwimp_send_message(wimp_USER_MESSAGE,
(wimp_message*)&msg, wimp_BROADCAST);
if (error) {
LOG(("xwimp_send_message: 0x%x: %s",
error->errnum, error->errmess));
warn_user("WimpError", error->errmess);
}
owns_clipboard = true;
}
LOG(("clipboard now holds %zd bytes", clip_length));
return true;
}
/**
* Copy the selected contents to the global clipboard,
* and claim ownership of the clipboard from other apps.
*
* \param s selection
* \return true iff successful, ie. cut operation can proceed without losing data
*/
bool gui_copy_to_clipboard(struct selection *s)
{
if (!gui_empty_clipboard())
return false;
selection_traverse(s, copy_handler, NULL);
return gui_commit_clipboard();
}
/**
* Request to paste the clipboard contents into a textarea/input field
* at a given position. Note that the actual operation may take place
* straight away (local clipboard) or in a number of chunks at some
* later time (clipboard owned by another app).
*
* \param g gui window
* \param x x ordinate at which to paste text
* \param y y ordinate at which to paste text
*/
void gui_paste_from_clipboard(struct gui_window *g, int x, int y)
{
if (owns_clipboard) {
if (clip_length > 0) {
char *utf8;
utf8_convert_ret ret;
/* Clipboard is in local encoding so
* convert to UTF8 */
ret = utf8_from_local_encoding(clipboard,
clip_length, &utf8);
if (ret == UTF8_CONVERT_OK) {
browser_window_paste_text(g->bw, utf8,
strlen(utf8), true);
free(utf8);
}
}
}
else {
wimp_full_message_data_request msg;
os_error *error;
os_coord pos;
if (!ro_gui_window_to_screen_pos(g, x, y, &pos))
return;
msg.size = sizeof(msg);
msg.your_ref = 0;
msg.action = message_DATA_REQUEST;
msg.w = g->window;
msg.i = -1;
msg.pos.x = pos.x;
msg.pos.y = pos.y;
msg.flags = wimp_DATA_REQUEST_CLIPBOARD;
msg.file_types[0] = osfile_TYPE_TEXT;
msg.file_types[1] = ~0;
error = xwimp_send_message(wimp_USER_MESSAGE,
(wimp_message*)&msg, wimp_BROADCAST);
if (error) {
LOG(("xwimp_send_message: 0x%x : %s",
error->errnum, error->errmess));
warn_user("WimpError", error->errmess);
}
}
}
/**
* Discard the current contents of the clipboard, if any, releasing the
* memory it uses.
*/
void ro_gui_discard_clipboard_contents(void)
{
if (clip_alloc) free(clipboard);
clip_alloc = 0;
clip_length = 0;
}
/**
* Responds to CLAIM_ENTITY message notifying us that the caret
* and selection or clipboard have been claimed by another application.
*
* \param claim CLAIM_ENTITY message
*/
void ro_gui_selection_claim_entity(wimp_full_message_claim_entity *claim)
{
/* ignore our own broadcasts! */
if (claim->sender != task_handle) {
LOG(("%x", claim->flags));
if (claim->flags & wimp_CLAIM_CARET_OR_SELECTION) {
owns_caret_and_selection = false;
}
if (claim->flags & wimp_CLAIM_CLIPBOARD) {
ro_gui_discard_clipboard_contents();
owns_clipboard = false;
}
}
}
/**
* Responds to DATA_REQUEST message, returning information about the
* clipboard contents if we own the clipboard.
*
* \param req DATA_REQUEST message
*/
void ro_gui_selection_data_request(wimp_full_message_data_request *req)
{
if (owns_clipboard && clip_length > 0 &&
(req->flags & wimp_DATA_REQUEST_CLIPBOARD)) {
wimp_full_message_data_xfer message;
int size;
// int i;
// for(i = 0; i < NOF_ELEMENTS(req->file_types); i++) {
// bits ftype = req->file_types[i];
// if (ftype == ~0U) break; /* list terminator */
//
// LOG(("type %x", ftype));
// i++;
// }
/* we can only supply text at the moment, so that's what you're getting! */
size = offsetof(wimp_full_message_data_xfer, file_name) + 9;
message.size = (size + 3) & ~3;
message.your_ref = req->my_ref;
message.action = message_DATA_SAVE;
message.w = req->w;
message.i = req->i;
message.pos = req->pos;
message.file_type = osfile_TYPE_TEXT;
message.est_size = clip_length;
memcpy(message.file_name, "TextFile", 9);
ro_gui_send_datasave(GUI_SAVE_CLIPBOARD_CONTENTS,
&message, req->sender);
}
}
/**
* Save the clipboard contents to a file.
*
* \param path the pathname of the file
* \return true iff success, otherwise reporting the error before returning false
*/
bool ro_gui_save_clipboard(const char *path)
{
os_error *error;
assert(clip_length > 0 && clipboard);
error = xosfile_save_stamped(path, osfile_TYPE_TEXT,
(byte*)clipboard,
(byte*)clipboard + clip_length);
if (error) {
LOG(("xosfile_save_stamped: 0x%x: %s",
error->errnum, error->errmess));
warn_user("SaveError", error->errmess);
return false;
}
return true;
}
/**
* Handler for Message_Dragging, used to implement auto-scrolling and
* ghost caret when a drag is in progress.
*/
void ro_gui_selection_dragging(wimp_message *message)
{
wimp_full_message_dragging *drag = (wimp_full_message_dragging*)message;
struct box *textarea = NULL;
struct browser_window *bw;
hlcache_handle *h;
int gadget_box_x = 0;
int gadget_box_y = 0;
struct gui_window *g;
os_coord pos;
int box_x = 0;
int box_y = 0;
/* with autoscrolling, we will probably need to remember the
* gui_window and override the drag->w window handle which
* could be any window on the desktop */
g = ro_gui_window_lookup(drag->w);
if ((drag->flags & wimp_DRAGGING_TERMINATE_DRAG) || !g) {
if (drag_claimed) {
/* make sure that we erase the ghost caret */
caret_remove(&ghost_caret);
}
drag_claimed = false;
return;
}
if (!ro_gui_window_to_window_pos(g, drag->pos.x, drag->pos.y, &pos))
return;
bw = g->bw;
h = bw->current_content;
if (h && content_get_type(h) == CONTENT_HTML &&
html_get_box_tree(h)) {
struct box *box = html_get_box_tree(h);
while ((box = box_at_point(box, pos.x, pos.y,
&box_x, &box_y, &h))) {
if (box->style &&
css_computed_visibility(box->style) ==
CSS_VISIBILITY_HIDDEN)
continue;
if (box->gadget &&
box->gadget->type == GADGET_TEXTAREA) {
textarea = box;
gadget_box_x = box_x;
gadget_box_y = box_y;
}
}
}
if (textarea) {
struct box *text_box = NULL;
int pixel_offset;
int char_offset;
/* draw/move the ghost caret */
if (drag_claimed)
caret_remove(&ghost_caret);
else
gui_window_set_pointer(g, GUI_POINTER_CARET);
text_box = textarea_get_position(textarea, pos.x - gadget_box_x,
pos.y - gadget_box_y,
&char_offset, &pixel_offset);
caret_set_position(&ghost_caret, bw, text_box,
char_offset, pixel_offset);
drag_claimed = true;
} else {
if (drag_claimed) {
/* make sure that we erase the ghost caret */
caret_remove(&ghost_caret);
}
drag_claimed = false;
}
if (drag_claimed) {
wimp_full_message_drag_claim claim;
os_error *error;
claim.size =
offsetof(wimp_full_message_drag_claim, file_types) + 8;
claim.your_ref = drag->my_ref;
claim.action = message_DRAG_CLAIM;
claim.flags = wimp_DRAG_CLAIM_POINTER_CHANGED |
wimp_DRAG_CLAIM_SUPPRESS_DRAGBOX;
claim.file_types[0] = osfile_TYPE_TEXT;
claim.file_types[1] = ~0;
error = xwimp_send_message(wimp_USER_MESSAGE,
(wimp_message *) &claim, drag->sender);
if (error) {
LOG(("xwimp_send_message: 0x%x: %s",
error->errnum, error->errmess));
warn_user("WimpError", error->errmess);
}
drag_claimed = true;
}
}
/**
* Reset drag-and-drop state when drag completes (DataSave received)
*/
void ro_gui_selection_drag_reset(void)
{
caret_remove(&ghost_caret);
drag_claimed = false;
}
/**
*
*/
void ro_gui_selection_drag_claim(wimp_message *message)
{
wimp_full_message_drag_claim *claim = (wimp_full_message_drag_claim*)message;
dragging_claimant = message->sender;
dragging_claimed = true;
/* have we been asked to remove the drag box/sprite? */
if (claim->flags & wimp_DRAG_CLAIM_SUPPRESS_DRAGBOX) {
ro_gui_drag_box_cancel();
}
else {
/* \todo - restore it here? */
}
/* do we need to restore the default pointer shape? */
if ((last_claim_flags & wimp_DRAG_CLAIM_POINTER_CHANGED) &&
!(claim->flags & wimp_DRAG_CLAIM_POINTER_CHANGED)) {
gui_window_set_pointer(last_start_window, GUI_POINTER_DEFAULT);
}
last_claim_flags = claim->flags;
}
void ro_gui_selection_send_dragging(wimp_pointer *pointer)
{
wimp_full_message_dragging dragmsg;
LOG(("sending DRAGGING to %p, %d", pointer->w, pointer->i));
dragmsg.size = offsetof(wimp_full_message_dragging, file_types) + 8;
dragmsg.your_ref = 0;
dragmsg.action = message_DRAGGING;
dragmsg.w = pointer->w;
dragmsg.i = pointer->i;
dragmsg.pos = pointer->pos;
/* \todo - this is interesting because it depends upon not just the state of the
shift key, but also whether it /can/ be deleted, ie. from text area/input
rather than page contents */
dragmsg.flags = wimp_DRAGGING_FROM_SELECTION;
dragmsg.box = dragging_box;
dragmsg.file_types[0] = osfile_TYPE_TEXT;
dragmsg.file_types[1] = ~0;
/* if the message_dragmsg messages have been claimed we must address them
to the claimant task, which is not necessarily the task that owns whatever
window happens to be under the pointer */
if (dragging_claimed) {
ro_message_send_message(wimp_USER_MESSAGE_RECORDED,
(wimp_message*)&dragmsg, dragging_claimant, ro_gui_dragging_bounced);
}
else {
ro_message_send_message_to_window(wimp_USER_MESSAGE_RECORDED,
(wimp_message*)&dragmsg, pointer->w, pointer->i,
ro_gui_dragging_bounced, &dragging_claimant);
}
}
/**
* Our message_DRAGGING message was bounced, ie. the intended recipient does not
* support the drag-and-drop protocol or cannot receive the data at the pointer
* position.
*/
void ro_gui_dragging_bounced(wimp_message *message)
{
dragging_claimed = false;
}