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netsurf/riscos/textselection.c

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/*
* 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 "utils/log.h"
#include "utils/utf8.h"
#include "utils/utils.h"
#include "content/hlcache.h"
#include "desktop/gui.h"
#include "desktop/textinput.h"
#include "riscos/gui.h"
#include "riscos/menus.h"
#include "riscos/message.h"
#include "riscos/mouse.h"
#include "riscos/save.h"
#include "riscos/textselection.h"
#include "riscos/ucstables.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
* Current paste buffer if we don't
*/
static char *clipboard = NULL;
static size_t clip_length = 0;
/* Paste context */
static ro_gui_selection_prepare_paste_cb paste_cb = NULL;
static void *paste_cb_pw = NULL;
static int paste_prev_message = 0;
static void ro_gui_selection_drag_end(wimp_dragged *drag, void *g);
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));
ro_mouse_drag_start(ro_gui_selection_drag_end, ro_gui_window_mouse_at,
NULL, 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 *drag position of pointer at conclusion of drag
* \param *data gui window pointer.
*/
static void ro_gui_selection_drag_end(wimp_dragged *drag, void *data)
{
wimp_auto_scroll_info scroll;
wimp_pointer pointer;
os_error *error;
os_coord pos;
struct gui_window *g = (struct gui_window *) data;
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_track(g->bw, 0, pos.x, pos.y);
}
/**
* Core tells front end to put given text in clipboard
*
* \param buffer UTF-8 text, owned by core
* \param length Byte length of UTF-8 text in buffer
* \param styles Array of styles given to text runs, owned by core, or NULL
* \param n_styles Number of text run styles in array
*/
static void gui_set_clipboard(const char *buffer, size_t length,
nsclipboard_styles styles[], int n_styles)
{
char *new_cb;
if (length == 0)
return;
new_cb = malloc(length);
if (new_cb == NULL)
return;
memcpy(new_cb, buffer, length);
/* Replace existing clipboard contents */
free(clipboard);
clipboard = new_cb;
clip_length = length;
if (!owns_clipboard) {
/* Tell RO we now own 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));
}
/**
* Core asks front end for clipboard contents.
*
* \param buffer UTF-8 text, allocated by front end, ownership yielded to core
* \param length Byte length of UTF-8 text in buffer
*/
static void gui_get_clipboard(char **buffer, size_t *length)
{
*buffer = NULL;
*length = 0;
if (clip_length > 0) {
char *cb = malloc(clip_length);
if (cb != NULL) {
memcpy(cb, clipboard, clip_length);
*buffer = cb;
*length = clip_length;
}
}
}
/**
* Discard the current contents of the clipboard, if any, releasing the
* memory it uses.
*/
void ro_gui_discard_clipboard_contents(void)
{
free(clipboard);
clipboard = NULL;
clip_length = 0;
}
static void ro_gui_selection_prepare_paste_complete(void)
{
ro_gui_selection_prepare_paste_cb cb = paste_cb;
void *pw = paste_cb_pw;
paste_cb = NULL;
paste_cb_pw = NULL;
paste_prev_message = 0;
cb(pw);
}
static void ro_gui_selection_prepare_paste_bounced(wimp_message *message)
{
ro_gui_selection_prepare_paste_complete();
}
/**
* Prepare to paste data from another application
*
* \param w Window being pasted into
* \param cb Callback to call once preparation is complete
* \param pw Private data for callback
*/
void ro_gui_selection_prepare_paste(wimp_w w,
ro_gui_selection_prepare_paste_cb cb, void *pw)
{
if (owns_clipboard) {
/* We own the clipboard: we're already prepared */
cb(pw);
} else {
/* Someone else owns the clipboard: request its contents */
wimp_full_message_data_request msg;
bool success;
ro_gui_discard_clipboard_contents();
msg.size = 48; /* There's only one filetype listed. */
msg.your_ref = 0;
msg.action = message_DATA_REQUEST;
msg.w = w;
msg.i = -1;
msg.pos.x = 0;
msg.pos.y = 0;
msg.flags = wimp_DATA_REQUEST_CLIPBOARD;
msg.file_types[0] = osfile_TYPE_TEXT;
msg.file_types[1] = ~0;
success = ro_message_send_message(wimp_USER_MESSAGE_RECORDED,
(wimp_message *) &msg, wimp_BROADCAST,
ro_gui_selection_prepare_paste_bounced);
if (success == false) {
/* Ensure key is handled, anyway */
cb(pw);
} else {
/* Set up paste context */
paste_cb = cb;
paste_cb_pw = pw;
paste_prev_message = msg.my_ref;
}
}
}
/**
* Prepare to paste data from another application (step 2)
*
* \param dataxfer DataSave message
* \return True if message was handled, false otherwise
*/
bool ro_gui_selection_prepare_paste_datasave(
wimp_full_message_data_xfer *dataxfer)
{
bool success;
/* Ignore messages that aren't for us */
if (dataxfer->your_ref == 0 || dataxfer->your_ref != paste_prev_message)
return false;
/* We're done if the paste data isn't text */
if (dataxfer->file_type != osfile_TYPE_TEXT) {
ro_gui_selection_prepare_paste_complete();
return true;
}
/* Generate and send DataSaveAck */
dataxfer->your_ref = dataxfer->my_ref;
dataxfer->size = offsetof(wimp_full_message_data_xfer, file_name) + 16;
dataxfer->action = message_DATA_SAVE_ACK;
dataxfer->est_size = -1;
memcpy(dataxfer->file_name, "<Wimp$Scrap>", SLEN("<Wimp$Scrap>") + 1);
success = ro_message_send_message(wimp_USER_MESSAGE_RECORDED,
(wimp_message *) dataxfer, dataxfer->sender,
ro_gui_selection_prepare_paste_bounced);
if (success == false) {
ro_gui_selection_prepare_paste_complete();
} else {
paste_prev_message = dataxfer->my_ref;
}
return true;
}
/**
* Prepare to paste data from another application (step 3)
*
* \param dataxfer DataLoad message
* \return True if message was handled, false otherwise
*/
bool ro_gui_selection_prepare_paste_dataload(
wimp_full_message_data_xfer *dataxfer)
{
FILE *fp;
long size;
char *local_cb;
nserror ret;
/* Ignore messages that aren't for us */
if (dataxfer->your_ref == 0 || dataxfer->your_ref != paste_prev_message)
return false;
fp = fopen(dataxfer->file_name, "r");
if (fp != NULL) {
fseek(fp, 0, SEEK_END);
size = ftell(fp);
fseek(fp, 0, SEEK_SET);
if (size > 0) {
local_cb = malloc(size);
if (local_cb != NULL) {
fread(local_cb, 1, size, fp);
ret = utf8_from_local_encoding(local_cb, size,
&clipboard);
if (ret == NSERROR_OK) {
clip_length = strlen(clipboard);
}
free(local_cb);
}
}
fclose(fp);
}
/* Send DataLoadAck */
dataxfer->action = message_DATA_LOAD_ACK;
dataxfer->your_ref = dataxfer->my_ref;
ro_message_send_message(wimp_USER_MESSAGE,
(wimp_message *) dataxfer, dataxfer->sender, NULL);
ro_gui_selection_prepare_paste_complete();
return true;
}
/**
* 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)
{
char *local_cb;
nserror ret;
os_error *error;
assert(clip_length > 0 && clipboard);
ret = utf8_to_local_encoding(clipboard, clip_length, &local_cb);
if (ret != NSERROR_OK) {
warn_user("SaveError", "Could not convert");
return false;
}
error = xosfile_save_stamped(path, osfile_TYPE_TEXT,
(byte*) local_cb,
(byte*) local_cb + strlen(local_cb));
free(local_cb);
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 gui_window *g;
os_coord pos;
/* 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) {
drag_claimed = false;
return;
}
if (!ro_gui_window_to_window_pos(g, drag->pos.x, drag->pos.y, &pos))
return;
drag_claimed = false;
}
/**
* Reset drag-and-drop state when drag completes (DataSave received)
*/
void ro_gui_selection_drag_reset(void)
{
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;
}
static struct gui_clipboard_table clipboard_table = {
.get = gui_get_clipboard,
.set = gui_set_clipboard,
};
struct gui_clipboard_table *riscos_clipboard_table = &clipboard_table;
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