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gcal-viewport: add vertical scroll capability

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Added function docs.
This commit is contained in:
Erick Pérez Castellanos
2014-12-04 17:10:23 -05:00
parent 800ecf938c
commit 765331cb4a
1 changed files with 82 additions and 2 deletions
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src/gcal-viewport.c
+82 -2
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@@ -20,10 +20,10 @@
#include "gcal-viewport.h"
#include <glib/gi18n.h>
#include <string.h>
#include <math.h>
struct _GcalViewportPrivate
{
/* property */
@@ -42,6 +42,9 @@ static void gcal_viewport_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural);
static gboolean gcal_viewport_scroll_event (GtkWidget *widget,
GdkEventScroll *event);
static void gcal_viewport_child_allocated (GtkWidget *widget,
GdkRectangle *allocation,
gpointer user_data);
@@ -60,6 +63,7 @@ gcal_viewport_class_init (GcalViewportClass *klass)
widget_class = GTK_WIDGET_CLASS (klass);
widget_class->get_preferred_width = gcal_viewport_get_preferred_width;
widget_class->get_preferred_height = gcal_viewport_get_preferred_height;
widget_class->scroll_event = gcal_viewport_scroll_event;
/* Setup the template GtkBuilder xml for this class */
gtk_widget_class_set_template_from_resource (widget_class, "/org/gnome/calendar/viewport.ui");
@@ -122,6 +126,75 @@ gcal_viewport_get_preferred_height (GtkWidget *widget,
*natural = 12;
}
static gboolean
gcal_viewport_scroll_event (GtkWidget *widget,
GdkEventScroll *event)
{
GcalViewportPrivate *priv;
gdouble delta_y;
gdouble delta;
g_return_val_if_fail (event != NULL, FALSE);
priv = GCAL_VIEWPORT (widget)->priv;
if (gdk_event_get_scroll_deltas ((GdkEvent *) event, NULL, &delta_y))
{
if (delta_y != 0.0 &&
priv->vscrollbar != NULL &&
gtk_widget_get_visible (priv->vscrollbar))
{
GtkAdjustment *adj;
gdouble new_value;
gdouble page_size;
gdouble scroll_unit;
adj = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
page_size = gtk_adjustment_get_page_size (adj);
scroll_unit = pow (page_size, 2.0 / 3.0);
new_value = CLAMP (gtk_adjustment_get_value (adj) + delta_y * scroll_unit,
gtk_adjustment_get_lower (adj),
gtk_adjustment_get_upper (adj) -
gtk_adjustment_get_page_size (adj));
gtk_adjustment_set_value (adj, new_value);
return TRUE;
}
}
else
{
GtkWidget *range = NULL;
if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
range = priv->vscrollbar;
if (range != NULL && gtk_widget_get_visible (range))
{
GtkAdjustment *adj;
gdouble new_value;
gdouble page_size;
adj = gtk_range_get_adjustment (GTK_RANGE (range));
page_size = gtk_adjustment_get_page_size (adj);
delta = pow (page_size, 2.0 / 3.0);
new_value = CLAMP (gtk_adjustment_get_value (adj) + delta,
gtk_adjustment_get_lower (adj),
gtk_adjustment_get_upper (adj) -
gtk_adjustment_get_page_size (adj));
gtk_adjustment_set_value (adj, new_value);
return TRUE;
}
}
return FALSE;
}
static void
gcal_viewport_child_allocated (GtkWidget *widget,
GdkRectangle *allocation,
@@ -160,6 +233,13 @@ gcal_viewport_new ()
return g_object_new (GCAL_TYPE_VIEWPORT, NULL);
}
/**
* gcal_viewport_add:
* @viewport: a #GcalViewport
* @widget: the widget to add
*
* Add @widget to internal viewport of #GcalViewport
**/
void
gcal_viewport_add (GcalViewport *viewport,
GtkWidget *widget)