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fontchooser: Populate the list incrementally

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By adding 20 fonts / frame to the font list, we can
get the font chooser dialog to show up much faster.

This change gets the font chooser up in 265ms here.
This commit is contained in:
Matthias Clasen 2020-08-25 15:13:39 -04:00 committed by Ahmed Eldemery
parent e5f4459e4b
commit 67f259cd1a
1 changed files with 39 additions and 0 deletions
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39
gtk/gtkfontchooserwidget.c
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@ -54,6 +54,7 @@
#include "gtkroot.h"
#include "gtkfilterlistmodel.h"
#include "gtkflattenlistmodel.h"
#include "gtkslicelistmodel.h"
#include "gtkmaplistmodel.h"
#include <hb-ot.h>
@ -770,6 +771,40 @@ axis_free (gpointer v)
g_free (a);
}
/* We incrementally populate our fontlist to prevent blocking
* the font chooser for a long time with expensive FcFontSort
* calls in pango for every row in the list).
*/
static gboolean
add_to_fontlist (GtkWidget *widget,
GdkFrameClock *clock,
gpointer user_data)
{
GtkFontChooserWidget *self = GTK_FONT_CHOOSER_WIDGET (widget);
GtkSliceListModel *model = user_data;
GListModel *child_model;
guint n;
if (gtk_filter_list_model_get_model (self->filter_model) != G_LIST_MODEL (model))
return G_SOURCE_REMOVE;
child_model = gtk_slice_list_model_get_model (model);
n = gtk_slice_list_model_get_size (model);
n += 10;
if (n >= g_list_model_get_n_items (child_model))
n = G_MAXUINT;
gtk_slice_list_model_set_size (model, n);
if (n == G_MAXUINT)
return G_SOURCE_REMOVE;
else
return G_SOURCE_CONTINUE;
}
static void
update_fontlist (GtkFontChooserWidget *self)
{
@ -784,6 +819,10 @@ update_fontlist (GtkFontChooserWidget *self)
model = g_object_ref (G_LIST_MODEL (fontmap));
else
model = G_LIST_MODEL (gtk_flatten_list_model_new (G_LIST_MODEL (g_object_ref (fontmap))));
model = G_LIST_MODEL (gtk_slice_list_model_new (model, 0, 20));
gtk_widget_add_tick_callback (GTK_WIDGET (self), add_to_fontlist, g_object_ref (model), g_object_unref);
gtk_filter_list_model_set_model (self->filter_model, model);
g_object_unref (model);
}