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Make LdCanvas zoom on mouse wheel.

This commit is contained in:
Přemysl Eric Janouch 2011-01-08 12:05:59 +01:00
parent 96f7710c25
commit 7ce03bac9d
1 changed files with 42 additions and 5 deletions
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47
src/ld-canvas.c
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@ -160,6 +160,7 @@ static void on_adjustment_value_changed
(GtkAdjustment *adjustment, LdCanvas *self);
static void on_size_allocate (GtkWidget *widget, GtkAllocation *allocation,
gpointer user_data);
static void update_adjustments (LdCanvas *self);
static void diagram_connect_signals (LdCanvas *self);
static void diagram_disconnect_signals (LdCanvas *self);
@ -175,6 +176,8 @@ static gboolean on_button_press (GtkWidget *widget, GdkEventButton *event,
gpointer user_data);
static gboolean on_button_release (GtkWidget *widget, GdkEventButton *event,
gpointer user_data);
static gboolean on_scroll (GtkWidget *widget, GdkEventScroll *event,
gpointer user_data);
static void ld_canvas_color_set (LdCanvasColor *color,
gdouble r, gdouble g, gdouble b, gdouble a);
@ -310,6 +313,8 @@ ld_canvas_init (LdCanvas *self)
G_CALLBACK (on_button_press), NULL);
g_signal_connect (self, "button-release-event",
G_CALLBACK (on_button_release), NULL);
g_signal_connect (self, "scroll-event",
G_CALLBACK (on_scroll), NULL);
g_object_set (self, "can-focus", TRUE, NULL);
@ -474,10 +479,8 @@ on_size_allocate (GtkWidget *widget, GtkAllocation *allocation,
gpointer user_data)
{
LdCanvas *self;
gdouble scale;
self = LD_CANVAS (widget);
scale = ld_canvas_get_scale_in_px (self);
/* FIXME: If the new allocation is bigger, we may see more than
* what we're supposed to be able to see -> adjust X and Y.
@ -485,17 +488,28 @@ on_size_allocate (GtkWidget *widget, GtkAllocation *allocation,
* If the visible area is just so large that we must see more,
* let's disable the scrollbars in question.
*/
update_adjustments (self);
}
static void
update_adjustments (LdCanvas *self)
{
gdouble scale;
scale = ld_canvas_get_scale_in_px (self);
if (self->priv->adjustment_h)
{
self->priv->adjustment_h->page_size = allocation->width / scale;
self->priv->adjustment_h->page_size
= GTK_WIDGET (self)->allocation.width / scale;
self->priv->adjustment_h->value
= self->priv->x - self->priv->adjustment_h->page_size / 2;
gtk_adjustment_changed (self->priv->adjustment_h);
}
if (self->priv->adjustment_v)
{
self->priv->adjustment_v->page_size = allocation->height / scale;
self->priv->adjustment_v->page_size
= GTK_WIDGET (self)->allocation.height / scale;
self->priv->adjustment_v->value
= self->priv->y - self->priv->adjustment_v->page_size / 2;
gtk_adjustment_changed (self->priv->adjustment_v);
@ -1006,6 +1020,29 @@ on_button_release (GtkWidget *widget, GdkEventButton *event, gpointer user_data)
return FALSE;
}
static gboolean
on_scroll (GtkWidget *widget, GdkEventScroll *event, gpointer user_data)
{
LdCanvas *self;
self = LD_CANVAS (widget);
switch (event->direction)
{
case GDK_SCROLL_UP:
self->priv->zoom *= 1.5;
break;
case GDK_SCROLL_DOWN:
self->priv->zoom /= 1.5;
break;
default:
return FALSE;
}
update_adjustments (self);
gtk_widget_queue_draw (widget);
return TRUE;
}
static gboolean
on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
{