[cairo-commit] cairo-demo/gtk ChangeLog, 1.3, 1.4 Makefile, 1.3,
1.4 README, 1.1, 1.2 mouse_events.c, NONE, 1.1
OEyvind Kolaas
commit at pdx.freedesktop.org
Thu Nov 11 11:45:55 PST 2004
Committed by: pippin
Update of /cvs/cairo/cairo-demo/gtk
In directory gabe:/tmp/cvs-serv4358
Modified Files:
ChangeLog Makefile README
Added Files:
mouse_events.c
Log Message:
added mouse event example
Index: ChangeLog
===================================================================
RCS file: /cvs/cairo/cairo-demo/gtk/ChangeLog,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -d -r1.3 -r1.4
--- ChangeLog 11 Nov 2004 17:49:08 -0000 1.3
+++ ChangeLog 11 Nov 2004 19:45:53 -0000 1.4
@@ -1,3 +1,9 @@
2004-11-11 Øyvind Kolås <pippin at freedesktop.org>
- * Initial checkin, replacing old direct gtk demo.
+ * mouse_events.c: illustration handling of mouse events, by
+ implementing rectangular rubber banding.
+ * Makefile, README: modified to reflect change.
+
+2004-11-11 Øyvind Kolås <pippin at freedesktop.org>
+
+ * Initial check-in, replacing old direct gtk demo.
Index: Makefile
===================================================================
RCS file: /cvs/cairo/cairo-demo/gtk/Makefile,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -d -r1.3 -r1.4
--- Makefile 11 Nov 2004 17:49:08 -0000 1.3
+++ Makefile 11 Nov 2004 19:45:53 -0000 1.4
@@ -1,4 +1,6 @@
-APPS = hello
+APPS = \
+ hello \
+ mouse_events
CFLAGS = -g -Wall
Index: README
===================================================================
RCS file: /cvs/cairo/cairo-demo/gtk/README,v
retrieving revision 1.1
retrieving revision 1.2
diff -u -d -r1.1 -r1.2
--- README 11 Nov 2004 17:49:08 -0000 1.1
+++ README 11 Nov 2004 19:45:53 -0000 1.2
@@ -1,3 +1,13 @@
Sample usage of the gtkcairo widget.
-hello.c - a very simple application with a gtkcairo widget in a window
+hello
+=====
+
+A very simple application with a gtkcairo widget in a window, displaying
+some text.
+
+mouse_events
+============
+
+Illustrating how to catch user events, only functionality new compared
+to hello.c is commented.
--- NEW FILE: mouse_events.c ---
/* alpha blended rubber band using gtkcairo, demonstrating mouse intercation
*
* only things that are new compared to hello.c are commented
*/
#include <gtk/gtk.h>
#include <gtkcairo.h>
#define DEFAULT_WIDTH 400
#define DEFAULT_HEIGHT 200
/* a structure keeping information about
* the selection */
typedef struct
{
gboolean active; /* whether the selection is active or not */
gdouble x, y;
gdouble w, h;
}
SelectionInfo;
static void paint (GtkWidget *widget,
cairo_t *cr,
SelectionInfo *sel_info);
/* forward definitions of handler for mouse events
*/
static gboolean event_press (GtkWidget *widget,
GdkEventButton *bev,
SelectionInfo *sel_info);
static gboolean event_release (GtkWidget *widget,
GdkEventButton *bev,
SelectionInfo *sel_info);
static gboolean event_motion (GtkWidget *widget,
GdkEventMotion *mev,
SelectionInfo *sel_info);
gint
main (gint argc,
gchar **argv)
{
GtkWidget *window;
GtkWidget *gtkcairo;
SelectionInfo selection = {FALSE, 0, 0, 0, 0};
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
g_signal_connect (G_OBJECT (window), "delete-event",
G_CALLBACK (gtk_main_quit), NULL);
gtkcairo = gtk_cairo_new ();
gtk_widget_set_size_request (gtkcairo, DEFAULT_WIDTH, DEFAULT_HEIGHT);
/* connect our drawing method to the "paint" signal
* passing in a pointer to the selection structure as the user data
*/
g_signal_connect (G_OBJECT (gtkcairo), "paint",
G_CALLBACK (paint),
&selection
);
/* add additional events the gtkcairo widget will listen for
*/
gtk_widget_add_events (gtkcairo,
GDK_BUTTON1_MOTION_MASK |
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK);
/* connect our rubber banding callbacks, like the paint callback
* we pass the selection as userdata
*/
g_signal_connect (G_OBJECT (gtkcairo), "button_press_event",
G_CALLBACK (event_press),
&selection
);
g_signal_connect (G_OBJECT (gtkcairo), "button_release_event",
G_CALLBACK (event_release),
&selection
);
g_signal_connect (G_OBJECT (gtkcairo), "motion_notify_event",
G_CALLBACK (event_motion),
&selection
);
gtk_container_add (GTK_CONTAINER (window), gtkcairo);
gtk_widget_show_all (window);
gtk_main ();
return 0;
}
/* function to draw the rectangular selection
*/
static void
paint_selection (cairo_t *cr,
SelectionInfo *sel_info)
{
if (!sel_info->active)
return;
cairo_save (cr);
cairo_rectangle (cr, sel_info->x, sel_info->y,
sel_info->w, sel_info->h);
cairo_save (cr);
cairo_set_rgb_color (cr, 0, 0, 1);
cairo_set_alpha (cr, 0.2);
cairo_fill (cr);
cairo_restore (cr);
cairo_set_rgb_color (cr, 0, 0, 0);
cairo_set_alpha (cr, 0.5);
cairo_stroke (cr);
cairo_restore (cr);
}
static void
paint (GtkWidget *widget,
cairo_t *cr,
SelectionInfo *sel_info)
{
gint width, height;
gint i;
width = widget->allocation.width;
height = widget->allocation.height;
cairo_save (cr);
cairo_rectangle (cr, 0, 0, width, height);
cairo_set_rgb_color (cr, 1,1,1);
cairo_fill (cr);
cairo_select_font (cr, "Sans", CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_BOLD);
cairo_save (cr);
cairo_scale_font (cr, 20);
cairo_move_to (cr, 40, 60);
cairo_set_rgb_color (cr, 0,0,0);
cairo_show_text (cr, "Drag your mouse here");
cairo_restore (cr);
cairo_set_rgb_color (cr, 1,0,0);
cairo_scale_font (cr, 15);
cairo_move_to (cr, 50, 100);
cairo_show_text (cr, "(and see alpha blended selection)");
cairo_set_rgb_color (cr, 0,0,1);
cairo_move_to (cr, 0, 150);
for (i=0; i< width/10; i++)
{
cairo_rel_line_to (cr, 5, 10);
cairo_rel_line_to (cr, 5, -10);
}
cairo_stroke (cr);
/* paint the selection */
paint_selection (cr, sel_info);
cairo_restore (cr);
}
static gboolean
event_press (GtkWidget *widget,
GdkEventButton *bev,
SelectionInfo *sel_info)
{
sel_info->active = TRUE;
sel_info->x = bev->x;
sel_info->y = bev->y;
sel_info->w = 0;
sel_info->h = 0;
/* tell the gtkcairo widget that it needs to redraw itself */
gtk_widget_queue_draw (widget);
return TRUE;
}
static gboolean
event_motion (GtkWidget *widget,
GdkEventMotion *mev,
SelectionInfo *sel_info)
{
sel_info->w = mev->x - sel_info->x;
sel_info->h = mev->y - sel_info->y;
/* tell the gtkcairo widget that it needs to redraw itself */
gtk_widget_queue_draw (widget);
return TRUE;
}
static gboolean
event_release (GtkWidget *widget,
GdkEventButton *bev,
SelectionInfo *sel_info)
{
sel_info->active = FALSE;
/* tell the gtkcairo widget that it needs to redraw itself */
gtk_widget_queue_draw (widget);
return TRUE;
}
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