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xview.c
619 lines (519 loc) · 19.7 KB
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xview.c
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/**
* View with Xlib Impl -
* Copyright (C) 2010 Sian Cao <sycao@redflag-linux.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xview.h"
#include "key.h"
#include "editor.h"
#include <locale.h>
SE_VIEW_HANDLER( se_text_xviewer_key_event );
SE_VIEW_HANDLER( se_text_xviewer_mouse_event );
SE_VIEW_HANDLER( se_text_xviewer_configure_change_handler );
static se_position se_text_cursor_to_physical( se_text_xviewer* viewer, se_cursor cur )
{
return (se_position){ cur.column * viewer->env->glyphMaxWidth,
cur.row * viewer->env->glyphMaxHeight };
}
static void se_text_xviewer_updateSize( se_text_xviewer* viewer, int width, int height )
{
assert( viewer );
assert( width && height );
viewer->physicalWidth = width;
viewer->physicalHeight = height;
const se_env* env = viewer->env;
viewer->columns = width / env->glyphMaxWidth;
viewer->rows = height / env->glyphMaxHeight;
se_debug( "new size in pixels (%d, %d), in chars (%d, %d)",
width, height, viewer->columns, viewer->rows );
//TODO: check if cursor if out of display
}
static void se_text_xviewer_show( se_text_xviewer* viewer )
{
XMapWindow( viewer->env->display, viewer->view );
XFlush( viewer->env->display );
}
SE_UNUSED void se_draw_char_utf8( se_text_xviewer* viewer, XftColor* color,
se_cursor cur, int c )
{
assert( viewer && viewer->xftDraw );
const se_env* env = viewer->env;
se_position cur_pos = se_text_cursor_to_physical(viewer, cur);
se_position start_pos = {
cur_pos.x,
cur_pos.y + env->glyphAscent,
};
XftDrawStringUtf8( viewer->xftDraw, color, viewer->env->xftFont,
start_pos.x, start_pos.y, (const XftChar8*)&c, 1 );
}
static void se_draw_text_utf8( se_text_xviewer* viewer, XftColor* color,
se_cursor cur, const char* utf8, int utf8_len )
{
assert( viewer && viewer->xftDraw );
const se_env* env = viewer->env;
se_position cur_pos = se_text_cursor_to_physical(viewer, cur);
se_position start_pos = {
cur_pos.x,
cur_pos.y + env->glyphAscent,
};
/* se_debug( "utf8: %s, utf8_len: %d", utf8, utf8_len ); */
XftDrawStringUtf8( viewer->xftDraw, color, viewer->env->xftFont,
start_pos.x, start_pos.y,
(const XftChar8*)utf8, utf8_len );
}
static void se_draw_buffer_point( se_text_xviewer* viewer )
{
se_env *env = viewer->env;
se_world *world = viewer->env->world;
g_assert( world );
se_buffer *cur_buf = world->current;
g_assert( cur_buf );
se_cursor point_cur = {
.row = cur_buf->getLine( cur_buf ),
.column = cur_buf->getCurrentColumn( cur_buf )
};
se_position point_pos = se_text_cursor_to_physical( viewer, point_cur );
point_pos.y -= (env->glyphMaxHeight - env->glyphAscent)/2;
XRenderColor renderClr = {
.red = 0x00,
.green = 0xffff,
.blue = 0x00,
.alpha = 0x00
};
XftColor clr;
XftColorAllocValue( env->display, env->visual, env->colormap, &renderClr, &clr );
XftDrawRect( viewer->xftDraw, &clr, point_pos.x, point_pos.y, 2, env->glyphMaxHeight );
XftColorFree( env->display, env->visual, env->colormap, &clr );
}
// send draw event and do real update in redisplay routine
static void se_text_xviewer_repaint( se_text_xviewer* viewer )
{
XWindowAttributes attrs;
XGetWindowAttributes( viewer->env->display, viewer->view, &attrs);
viewer->updateSize( viewer, attrs.width, attrs.height );
//refill text viewer
se_world *world = viewer->env->world;
g_assert( world );
se_buffer *cur_buf = world->current;
g_assert( cur_buf );
//FIXME: this is slow algo just as a demo, change it later
se_line* lp = cur_buf->lines;
int nr_lines = cur_buf->getLineCount( cur_buf );
se_debug( "paint rect: rows: %d", nr_lines );
for (int r = 0; r < MIN(viewer->rows, nr_lines); ++r) {
const char* buf = se_line_getData( lp );
int cols = se_line_getLineLength( lp );
if ( buf[cols-1] == '\n' ) cols--;
memcpy( (viewer->content + r*SE_MAX_ROWS), buf, cols );
*(viewer->content + r*SE_MAX_ROWS+cols) = '\0';
/* se_debug( "draw No.%d: [%s]", r, buf ); */
lp = lp->next;
}
}
static void se_text_xviewer_redisplay(se_text_xviewer* viewer )
{
se_debug( "redisplay" );
se_env *env = viewer->env;
XRenderColor renderClr = {
.red = 0x0,
.green = 0x0,
.blue = 0x0,
.alpha = 0xffff
};
XftColor clr;
XftColorAllocValue( env->display, env->visual, env->colormap, &renderClr, &clr );
se_world *world = viewer->env->world;
g_assert( world );
se_buffer *cur_buf = world->current;
g_assert( cur_buf );
int nr_lines = cur_buf->getLineCount( cur_buf );
se_debug( "update buf %s [%d, %d]", cur_buf->getBufferName(cur_buf),
viewer->columns, MIN(viewer->rows, nr_lines) );
// this clear the whole window ( slow )
XClearArea( env->display, viewer->view, 0, 0, 0, 0, False );
viewer->cursor = (se_cursor){ 0, 0 };
for (int r = 0; r < MIN(viewer->rows, nr_lines); ++r) {
char *data = viewer->content + r*SE_MAX_ROWS;
int data_len = strlen( data );
se_draw_text_utf8( viewer, &clr, viewer->cursor,
data, MIN(data_len, viewer->columns) );
viewer->cursor = (se_cursor){0, viewer->cursor.row + 1};
}
se_draw_buffer_point( viewer );
XftColorFree( env->display, env->visual, env->colormap, &clr );
}
void se_text_xviewer_configure_change_handler(se_text_xviewer* viewer, XEvent* ev )
{
se_debug( "enter configure_change_handler" );
gboolean need_update = FALSE;
if ( ev->type == ConfigureRequest ) {
XConfigureEvent configEv = ev->xconfigure;
if ( viewer->physicalWidth != configEv.width
|| viewer->physicalHeight != configEv.height ) {
need_update = TRUE;
}
} else if ( ev->type == ResizeRequest ) {
XResizeRequestEvent resizeEv = ev->xresizerequest;
if ( viewer->physicalWidth != resizeEv.width
|| viewer->physicalHeight != resizeEv.height ) {
need_update = TRUE;
}
}
if ( need_update ) {
XWindowAttributes attrs;
XGetWindowAttributes( viewer->env->display, viewer->view, &attrs);
viewer->updateSize( viewer, attrs.width, attrs.height );
}
}
static se_key se_key_event_process( Display *display, XKeyEvent kev )
{
int index = 0;
int mask = 0;
if ( kev.state & ShiftMask ) {
mask = 0x01;
}
if ( kev.state & LockMask ) {
mask |= 0x02;
}
if ( mask ) index = 1;
KeySym key_sym = XKeycodeToKeysym( display, kev.keycode, index );
if ( key_sym == NoSymbol ) {
se_debug( "NoSymbol for keycode %d", kev.keycode );
}
se_key sekey = se_key_null_init();
char *key_str = XKeysymToString( key_sym );
// FIXME: this is a simplified version, since KeySym actually follow latin-1
// except for some terminal control keys
if ( g_str_has_prefix(key_str, "Alt")
|| g_str_has_prefix(key_str, "Meta")
|| g_str_has_prefix(key_str, "Super")
|| g_str_has_prefix(key_str, "Control")
|| g_str_has_prefix(key_str, "Shift") ) {
return sekey;
}
sekey.ascii = key_sym;
if ( kev.state & ControlMask ) {
sekey.modifiers |= ControlDown;
}
if ( kev.state & ShiftMask ) {
sekey.modifiers |= ShiftDown;
}
if ( kev.state & Mod1Mask ) {
sekey.modifiers |= MetaDown;
}
if ( kev.state & Mod4Mask ) {
// this is no good, Mod4 can be map to other keysym
sekey.modifiers |= SuperDown;
}
if ( sekey.modifiers == ShiftDown ) { // here Shift is not part of combination
// only change case of char
sekey.modifiers = 0;
}
se_debug( "sekey(%s): %s", key_str, se_key_to_string(sekey) );
return sekey;
}
static se_key se_delayed_wait_key(se_text_xviewer* viewer)
{
se_debug( "waiting for a key..." );
XEvent ev;
while ( XCheckWindowEvent( viewer->env->display, viewer->view,
KeyPressMask, &ev ) == False ) {
usleep( 100 );
}
/* g_assert( ev.type == KeyPress ); */
se_debug( "wait for a key done" );
return se_key_event_process( viewer->env->display, ev.xkey );
}
// return TRUE if input is a composed str from IM, and returned from arg str
static gboolean se_text_xviewer_lookup_string(se_text_xviewer* viewer, XKeyEvent* kev,
GString *str)
{
char buf[64] = "";
int buf_len = sizeof buf - 1;
KeySym keysym;
Status status;
Xutf8LookupString( viewer->xic, kev, buf, buf_len, &keysym, &status );
gboolean composed_input = FALSE;
switch (status) {
case XBufferOverflow:
se_warn("XBufferOverflow");
break;
case XLookupNone:
se_debug("XLookupNone");
break;
case XLookupKeySym:
if (status == XLookupKeySym) {
se_debug( "XLookupKeySym: sym: %s", XKeysymToString(keysym) );
}
break;
case XLookupBoth:
se_debug( "XLookupBoth: sym: %s", XKeysymToString(keysym) );
se_debug( "XLookupBoth: buf: [%s]", buf );
if ((keysym == XK_Delete) || (keysym == XK_BackSpace)) {
se_debug("delete");
break;
}
break;
case XLookupChars:
se_debug( "XLookupChars: buf: [%s]", buf );
g_string_printf( str, "%s", buf );
composed_input = TRUE;
break;
}
return composed_input;
}
void se_text_xviewer_key_event(se_text_xviewer* viewer, XEvent* ev )
{
assert( viewer && ev );
XKeyEvent kev = ev->xkey;
if ( kev.type == KeyPress ) {
se_key sekey = se_key_null_init();
GString *chars = g_string_new("");
gboolean composed_input = se_text_xviewer_lookup_string(viewer, &kev, chars );
//FIXME: right now, do not handle Unicode before I finish basic facilities
composed_input = FALSE;
if ( !composed_input ) {
sekey = se_key_event_process( viewer->env->display, kev );
if ( se_key_is_null(sekey) )
return;
if ( sekey.ascii == XK_Escape )
se_env_quit( viewer->env );
}
se_world *world = viewer->env->world;
se_command_args args;
bzero( &args, sizeof args );
args.composedStr = g_string_new("");
args.universalArg = g_string_new("");
if ( composed_input ) {
args.flags |= SE_IM_ARG;
g_string_assign( args.composedStr, chars->str );
g_string_free( chars, TRUE );
}
while ( world->dispatchCommand( world, &args, sekey ) != TRUE ) {
sekey = se_delayed_wait_key( viewer );
if ( sekey.ascii == XK_Escape )
se_env_quit( viewer->env );
}
g_string_free( args.composedStr, TRUE );
g_string_free( args.universalArg, TRUE );
if ( world->current->isModified(world->current) ) {
viewer->repaint( viewer );
viewer->redisplay( viewer );
}
}
}
void se_text_xviewer_mouse_event(se_text_xviewer* viewer, XEvent* ev )
{
se_debug( "enter mouse event" );
}
void se_text_xviewer_draw_create( se_text_xviewer* viewer )
{
assert ( viewer->env->xftFont );
if ( viewer->xftDraw ) {
XftDrawDestroy( viewer->xftDraw );
viewer->xftDraw = NULL;
}
viewer->xftDraw = XftDrawCreate(
viewer->env->display, viewer->view, viewer->env->visual,
viewer->env->colormap );
}
/*
* This function chooses the "more desirable" of two input styles. The
* style with the more complicated Preedit style is returned, and if the
* styles have the same Preedit styles, then the style with the more
* complicated Status style is returned. There is no "official" way to
* order interaction styles; this one seems reasonable, though.
* This is a long procedure for a simple heuristic.
*/
static XIMStyle ChooseBetterStyle(XIMStyle style1, XIMStyle style2)
{
XIMStyle s,t;
XIMStyle preedit = XIMPreeditArea | XIMPreeditCallbacks |
XIMPreeditPosition | XIMPreeditNothing | XIMPreeditNone;
XIMStyle status = XIMStatusArea | XIMStatusCallbacks |
XIMStatusNothing | XIMStatusNone;
if (style1 == 0) {
se_debug("use style2");
return style2;
}
if (style2 == 0) {
se_debug("use style1");
return style1;
}
if ((style1 & (preedit | status)) == (style2 & (preedit | status)))
return style1;
s = style1 & preedit;
t = style2 & preedit;
if (s != t) {
if (s | t | XIMPreeditCallbacks)
return (s == XIMPreeditCallbacks)?style1:style2;
else if (s | t | XIMPreeditPosition)
return (s == XIMPreeditPosition)?style1:style2;
else if (s | t | XIMPreeditArea)
return (s == XIMPreeditArea)?style1:style2;
else if (s | t | XIMPreeditNothing)
return (s == XIMPreeditNothing)?style1:style2;
}
else { /* if preedit flags are the same, compare status flags */
s = style1 & status;
t = style2 & status;
if (s | t | XIMStatusCallbacks)
return (s == XIMStatusCallbacks)?style1:style2;
else if (s | t | XIMStatusArea)
return (s == XIMStatusArea)?style1:style2;
else if (s | t | XIMStatusNothing)
return (s == XIMStatusNothing)?style1:style2;
}
return 0;
}
static void dump_style( XIMStyle best_style )
{
GString *style_str = g_string_new("");
if ( best_style & XIMPreeditCallbacks)
g_string_append_printf( style_str, ",%s", "XIMPreeditCallbacks");
if ( best_style & XIMPreeditPosition )
g_string_append_printf( style_str, ",%s", "XIMPreeditPosition");
if ( best_style & XIMPreeditArea )
g_string_append_printf( style_str, ",%s", "XIMPreeditArea");
if ( best_style & XIMPreeditNothing )
g_string_append_printf( style_str, ",%s", "XIMPreeditNothing");
if ( best_style & XIMPreeditNone )
g_string_append_printf( style_str, ",%s", "XIMPreeditNone");
if ( best_style & XIMStatusCallbacks )
g_string_append_printf( style_str, ",%s", "XIMStatusCallbacks");
if ( best_style & XIMStatusArea )
g_string_append_printf( style_str, ",%s", "XIMStatusArea");
if ( best_style & XIMStatusNothing )
g_string_append_printf( style_str, ",%s", "XIMStatusNothing");
if ( best_style & XIMStatusNone )
g_string_append_printf( style_str, ",%s", "XIMStatusNone");
se_debug("best_style: %s", style_str->str );
g_string_free( style_str, True );
}
se_text_xviewer* se_text_xviewer_create( se_env* env )
{
se_text_xviewer* viewer = g_malloc0( sizeof(se_text_xviewer) );
if ( !viewer ) {
se_error( "can not malloc a viewer obj" );
}
viewer->env = env;
int width = 800;
int height = 600;
viewer->view = XCreateSimpleWindow(
env->display, env->root, 0, 0, width, height, 0,
BlackPixel(env->display, env->screen),
WhitePixel(env->display, env->screen) );
viewer->key_handler = se_text_xviewer_key_event;
viewer->mouse_handler = se_text_xviewer_mouse_event;
viewer->configure_change_handler = se_text_xviewer_configure_change_handler;
viewer->show = se_text_xviewer_show;
viewer->repaint = se_text_xviewer_repaint;
viewer->redisplay = se_text_xviewer_redisplay;
viewer->updateSize = se_text_xviewer_updateSize;
se_text_xviewer_draw_create( viewer );
viewer->content = g_malloc0( SE_MAX_COLUMNS * SE_MAX_ROWS );
XIMStyles *im_supported_styles;
XIMStyle app_supported_styles;
XIMStyle style;
XIMStyle best_style;
XGetIMValues( env->xim, XNQueryInputStyle, &im_supported_styles, NULL );
app_supported_styles = XIMPreeditNone | XIMPreeditNothing | XIMPreeditArea
| XIMStatusNone | XIMStatusNothing | XIMStatusArea;
best_style = 0;
se_debug( "styles count: %d", im_supported_styles->count_styles );
for(int i=0; i < im_supported_styles->count_styles; i++) {
style = im_supported_styles->supported_styles[i];
dump_style( style );
if ((style & app_supported_styles) == style) /* if we can handle it */
best_style = ChooseBetterStyle(style, best_style);
}
/* if we couldn't support any of them, print an error and exit */
if (best_style == 0) {
se_error("commonly supported interaction style.");
exit(1);
}
XFree(im_supported_styles);
dump_style( best_style );
viewer->xic = XCreateIC(env->xim, XNInputStyle, best_style,
XNClientWindow, viewer->view,
NULL);
if ( viewer->xic == NULL ) {
se_debug(" create xic failed" );
exit(1);
}
se_debug( "XLocaleOfIM: %s", XLocaleOfIM( env->xim ) );
return viewer;
}
int main_loop(int argc, char *argv[])
{
setup_language();
se_env* env = se_env_init();
se_text_xviewer* viewer = se_text_xviewer_create( env );
long im_event_mask;
XGetICValues( viewer->xic, XNFilterEvents, &im_event_mask, NULL );
int mask = ExposureMask | ButtonPressMask | ButtonReleaseMask
| KeyPressMask | KeyReleaseMask | SubstructureNotifyMask
| FocusChangeMask
| im_event_mask;
XSelectInput( env->display, viewer->view, mask );
XSetICFocus( viewer->xic );
viewer->repaint( viewer );
viewer->show( viewer );
while ( 1 ) { // sync the first expose event
XEvent ev;
XNextEvent( env->display, &ev );
if ( ev.xany.window == viewer->view && ev.type == Expose ) {
viewer->redisplay( viewer );
break;
}
}
while( !env->exitLoop ) {
XEvent ev;
XNextEvent( env->display, &ev );
if ( XFilterEvent( &ev, None ) == True ) {
se_debug("IM filtered event: %s", XEventTypeString(ev.type) );
continue;
}
if ( ev.xany.window != viewer->view ) {
se_msg( "skip event does not forward to view" );
continue;
}
switch( ev.type ) {
case Expose:
se_debug( "Expose" );
if ( ev.xexpose.count > 0 )
break;
viewer->redisplay( viewer );
break;
case KeyPress:
case KeyRelease:
viewer->key_handler( viewer, &ev );
break;
case ConfigureNotify:
case MapNotify:
se_debug( "confiugration changed" );
viewer->configure_change_handler( viewer, &ev );
break;
default:
break;
}
}
se_debug( "exit loop" );
XUnsetICFocus( viewer->xic );
XDestroyIC( viewer->xic );
se_env_release( env );
return 0;
}