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Add support for zooming using the scroll-wheel

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This allows zooming in with the scroll-wheel if you have one (or the
two-finger scrolling on a touchpad).

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Linus Torvalds 2012-11-13 01:44:16 +01:00 • committed by Dirk Hohndel
parent 79798dc15b
commit 4ce0ce153a
1 changed files with 37 additions and 4 deletions
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41
gtk-gui.c
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@ -1340,6 +1340,7 @@ static gboolean profile_tooltip (GtkWidget *widget, gint x, gint y,
}
static double zoom_factor = 1.0;
static int zoom_x = -1, zoom_y = -1;
static gboolean expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer data)
@ -1360,9 +1361,10 @@ static gboolean expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer
init_profile_background(&gc);
cairo_paint(gc.cr);
if (zoom_x >= 0) {
cairo_translate(gc.cr, -1.5*zoom_x, -1.5*zoom_y);
cairo_scale(gc.cr, 2.5, 2.5);
if (zoom_factor > 1.0) {
double n = -(zoom_factor-1);
cairo_translate(gc.cr, n*zoom_x, n*zoom_y);
cairo_scale(gc.cr, zoom_factor, zoom_factor);
}
if (dive) {
@ -1378,12 +1380,41 @@ static gboolean expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer
return FALSE;
}
static void zoom_event(int x, int y, double inc)
{
zoom_x = x;
zoom_y = y;
inc += zoom_factor;
if (inc < 1.0)
inc = 1.0;
else if (inc > 10)
inc = 10;
zoom_factor = inc;
}
gboolean scroll_event(GtkWidget *widget, GdkEventScroll *event, gpointer user_data)
{
switch (event->direction) {
case GDK_SCROLL_UP:
zoom_event(event->x, event->y, 0.1);
break;
case GDK_SCROLL_DOWN:
zoom_event(event->x, event->y, -0.1);
break;
default:
return TRUE;
}
gtk_widget_queue_draw(widget);
return TRUE;
}
gboolean clicked(GtkWidget *widget, GdkEventButton *event, gpointer user_data)
{
switch (event->button) {
case 1:
zoom_x = event->x;
zoom_y = event->y;
zoom_factor = 2.5;
break;
default:
return TRUE;
@ -1397,6 +1428,7 @@ gboolean released(GtkWidget *widget, GdkEventButton *event, gpointer user_data)
switch (event->button) {
case 1:
zoom_x = zoom_y = -1;
zoom_factor = 1.0;
break;
default:
return TRUE;
@ -1424,9 +1456,10 @@ GtkWidget *dive_profile_widget(void)
gtk_widget_set_size_request(da, 350, 250);
g_signal_connect(da, "expose_event", G_CALLBACK(expose_event), NULL);
g_signal_connect(da, "button-press-event", G_CALLBACK(clicked), NULL);
g_signal_connect(da, "scroll-event", G_CALLBACK(scroll_event), NULL);
g_signal_connect(da, "button-release-event", G_CALLBACK(released), NULL);
g_signal_connect(da, "motion-notify-event", G_CALLBACK(motion), NULL);
gtk_widget_add_events(da, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_MOTION_MASK | GDK_BUTTON_RELEASE_MASK);
gtk_widget_add_events(da, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_MOTION_MASK | GDK_BUTTON_RELEASE_MASK | GDK_SCROLL_MASK);
return da;
}