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| /* p 793-797 vdoc.pub_gtk-programming-in-c.pdf */
# include <stdlib.h>
# include <stdint.h> /* pour malloc */
# include <gtk-2.0/gtk/gtk.h>
# include <gtk-2.0/gdk/gdk.h>
#define RED 1
#define GREEN 2
#define BLUE 4
typedef struct piece {
int x;
int y;
guint32 time;
unsigned char color;
} Piece;
typedef struct cleardata {
GtkWidget *w;
GList **list;
} ClearData;
static GtkWidget *gRedPmap, *gGreenPmap, *gBluePmap;
static unsigned char gColor = RED;
static GtkWidget*
NewPixmap( char *filename, GdkWindow *window, GdkColor *background )
{
GtkWidget *wpixmap;
GdkPixmap *pixmap;
GdkBitmap *mask;
pixmap = gdk_pixmap_create_from_xpm( window, &mask, background, filename );
wpixmap = gtk_pixmap_new( pixmap, mask );
return wpixmap;
}
static void
SetColor( GtkWidget *widget, gpointer arg )
{
// gColor = (unsigned char) arg;
// https://stackoverflow.com/questions/21323628/warning-cast-to-from-pointer-from-to-integer-of-different-size
gColor = (intptr_t) arg;
}
static void
ClearDrawing ( GtkWidget *widget, gpointer arg )
{
ClearData *p = (ClearData *) arg;
GList **list = p->list;
GList *tmp_list;
for (tmp_list = *list; tmp_list; tmp_list = tmp_list->next)
g_free(tmp_list->data);
g_list_free(*list);
*list = (GList *) NULL;
gdk_window_clear( p->w->window );
}
static int
CompFunc( gconstpointer a, gconstpointer b )
{
Piece *piece1, *piece2;
piece1 = (Piece *) a;
piece2 = (Piece *) b;
if ( piece1->time < piece2->time )
return FALSE;
return TRUE;
}
static gint
ButtonPress( GtkWidget *widget, GdkEventButton *event, gpointer arg )
{
ClearData *p = (ClearData *) arg;
GList **items = (GList **) p->list;
GtkPixmap *pixmap;
Piece *piece;
piece = (Piece *) malloc( sizeof( Piece ) );
piece->color = gColor;
piece->x = (gint) event->x;
piece->y = (gint) event->y;
piece->time = gdk_event_get_time( (GdkEvent *) event );
*items = g_list_insert_sorted( *items, piece, CompFunc );
switch ( piece->color ) {
case RED:
pixmap = GTK_PIXMAP( gRedPmap );
break;
case GREEN:
pixmap = GTK_PIXMAP( gGreenPmap );
break ;
case BLUE:
pixmap = GTK_PIXMAP( gBluePmap ) ;
break ;
}
gdk_draw_pixmap( widget->window, widget->style->black_gc,
pixmap->pixmap, 0, 0, piece->x, piece->y, -1, -1 );
return FALSE;
}
static gint
HandleExpose( GtkWidget *widget, GdkEventExpose *event, gpointer arg )
{
GList **p = (GList **) arg, *list = (GList *) *p;
GdkRectangle rect, dest;
GtkPixmap *pixmap;
Piece *piece;
int i;
for ( i = 0; *p != (GList *) NULL; i++, *p = g_list_next( * p ) ) {
piece = g_list_nth_data( (GList *) list, i );
rect.x = piece->x;
rect.y = piece->y;
rect.width = rect.height = 20;
if ( gdk_rectangle_intersect (
&rect, &event->area, &dest ) == TRUE ) {
switch ( piece->color ) {
case RED:
pixmap = GTK_PIXMAP( gRedPmap );
break;
case GREEN:
pixmap = GTK_PIXMAP( gGreenPmap );
break;
case BLUE:
pixmap = GTK_PIXMAP( gBluePmap );
break;
default:
continue;
}
gdk_draw_pixmap( widget->window,
widget->style->black_gc,
pixmap->pixmap, 0, 0,
piece->x, piece->y, -1, -1 );
}
}
*p = list;
return FALSE;
}
int main( int argc, char *argv[] )
{
GtkWidget *dialog, *button, *drawing, *toolbar;
GList *items = (GList *) NULL;
ClearData cd;
gtk_init( &argc, &argv );
dialog = gtk_dialog_new ();
gtk_window_position( GTK_WINDOW( dialog ), GTK_WIN_POS_MOUSE );
g_signal_connect (G_OBJECT (dialog), "destroy", GTK_SIGNAL_FUNC (gtk_main_quit), NULL);
gtk_widget_show( dialog );
// toolbar = gtk_toolbar_new( GTK_ORIENTATION_HORIZONTAL, GTK_TOOLBAR_BOTH );
toolbar = gtk_toolbar_new();
gtk_toolbar_set_style(GTK_TOOLBAR(toolbar), GTK_TOOLBAR_BOTH);
gRedPmap = NewPixmap( "red.xpm", dialog->window,
&dialog->style->bg [GTK_STATE_NORMAL] ),
gtk_toolbar_append_item( GTK_TOOLBAR(toolbar), "Red ",
"Draw red square", NULL, gRedPmap,
(GtkSignalFunc) SetColor, (gpointer) RED );
gGreenPmap = NewPixmap ( "green.xpm", dialog->window,
&dialog->style->bg[GTK_STATE_NORMAL] ),
gtk_toolbar_append_item( GTK_TOOLBAR(toolbar), "Green",
"Draw green square", NULL, gGreenPmap,
(GtkSignalFunc) SetColor, (gpointer) GREEN );
gBluePmap = NewPixmap( "blue.xpm", dialog->window,
&dialog->style->bg [GTK_STATE_NORMAL] ),
gtk_toolbar_append_item( GTK_TOOLBAR(toolbar), "Blue",
"Draw blue square", NULL, gBluePmap,
(GtkSignalFunc) SetColor, (gpointer) BLUE );
gtk_box_pack_start( GTK_BOX( GTK_DIALOG( dialog )->vbox ), toolbar,
FALSE, TRUE, 0 );
drawing = gtk_drawing_area_new();
gtk_drawing_area_size( GTK_DRAWING_AREA( drawing ), 320, 200 );
gtk_signal_connect( GTK_OBJECT( drawing ), "expose_event" ,
GTK_SIGNAL_FUNC( HandleExpose ), &items );
gtk_widget_set_events( drawing,
GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK);
cd.w = drawing;
cd.list = &items;
gtk_signal_connect( GTK_OBJECT( drawing ), "button_press_event",
GTK_SIGNAL_FUNC( ButtonPress ), &cd );
gtk_box_pack_start( GTK_BOX( GTK_DIALOG( dialog )->vbox ), drawing,
TRUE, TRUE, 0 );
button = gtk_button_new_with_label( "Clear" );
gtk_box_pack_start( GTK_BOX( GTK_DIALOG( dialog )->action_area ),
button, TRUE, FALSE, 0 );
gtk_signal_connect( GTK_OBJECT( button ), "clicked",
GTK_SIGNAL_FUNC( ClearDrawing ), &cd );
gtk_widget_show_all( dialog );
gtk_main();
return 0; // ajout moi
} |
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