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gtk-demo: Add a scrolling image demo

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This tests big textures.
This commit is contained in:
Matthias Clasen 2019-10-22 21:20:36 -04:00
parent 0284d40e24
commit 1f0310ddff
2 changed files with 60 additions and 10 deletions
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67
demos/gtk-demo/iconscroll.c
View File

@ -6,15 +6,17 @@
#include <gtk/gtk.h>
static guint tick_cb;
static GtkAdjustment *adjustment;
static GtkAdjustment *hadjustment;
static GtkAdjustment *vadjustment;
static GtkWidget *window = NULL;
static GtkWidget *scrolledwindow;
static int selected;
#define N_WIDGET_TYPES 3
#define N_WIDGET_TYPES 4
int increment = 5;
static int hincrement = 5;
static int vincrement = 5;
static gboolean
scroll_cb (GtkWidget *widget,
@ -23,12 +25,19 @@ scroll_cb (GtkWidget *widget,
{
double value;
value = gtk_adjustment_get_value (adjustment);
if (value + increment <= gtk_adjustment_get_lower (adjustment) ||
(value + increment >= gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_page_size (adjustment)))
increment = - increment;
value = gtk_adjustment_get_value (vadjustment);
if (value + vincrement <= gtk_adjustment_get_lower (vadjustment) ||
(value + vincrement >= gtk_adjustment_get_upper (vadjustment) - gtk_adjustment_get_page_size (vadjustment)))
vincrement = - vincrement;
gtk_adjustment_set_value (adjustment, value + increment);
gtk_adjustment_set_value (vadjustment, value + vincrement);
value = gtk_adjustment_get_value (hadjustment);
if (value + hincrement <= gtk_adjustment_get_lower (hadjustment) ||
(value + hincrement >= gtk_adjustment_get_upper (hadjustment) - gtk_adjustment_get_page_size (hadjustment)))
hincrement = - hincrement;
gtk_adjustment_set_value (hadjustment, value + hincrement);
return G_SOURCE_CONTINUE;
}
@ -51,6 +60,11 @@ populate_icons (void)
for (left = 0; left < 15; left++)
gtk_grid_attach (GTK_GRID (grid), create_icon (), left, top, 1, 1);
hincrement = 0;
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow),
GTK_POLICY_NEVER,
GTK_POLICY_AUTOMATIC);
gtk_container_add (GTK_CONTAINER (scrolledwindow), grid);
}
@ -82,9 +96,38 @@ populate_text (gboolean hilight)
textview = gtk_text_view_new ();
gtk_text_view_set_buffer (GTK_TEXT_VIEW (textview), buffer);
hincrement = 0;
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow),
GTK_POLICY_NEVER,
GTK_POLICY_AUTOMATIC);
gtk_container_add (GTK_CONTAINER (scrolledwindow), textview);
}
static void
populate_image (void)
{
GtkWidget *image;
if (!content)
{
GBytes *bytes;
bytes = g_resources_lookup_data ("/sources/font_features.c", 0, NULL);
content = g_bytes_unref_to_data (bytes, &content_len);
}
image = gtk_picture_new_for_resource ("/sliding_puzzle/portland-rose.jpg");
gtk_picture_set_can_shrink (GTK_PICTURE (image), FALSE);
hincrement = 5;
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow),
GTK_POLICY_AUTOMATIC,
GTK_POLICY_AUTOMATIC);
gtk_container_add (GTK_CONTAINER (scrolledwindow), image);
}
static void
set_widget_type (int type)
{
@ -114,6 +157,11 @@ set_widget_type (int type)
populate_text (TRUE);
break;
case 3:
gtk_window_set_title (GTK_WINDOW (window), "Scrolling a big image");
populate_image ();
break;
default:
g_assert_not_reached ();
}
@ -172,7 +220,8 @@ do_iconscroll (GtkWidget *do_widget)
G_CALLBACK (gtk_widget_destroyed), &window);
scrolledwindow = GTK_WIDGET (gtk_builder_get_object (builder, "scrolledwindow"));
gtk_widget_realize (window);
adjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "adjustment"));
hadjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "hadjustment"));
vadjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "vadjustment"));
set_widget_type (0);
}

3
demos/gtk-demo/iconscroll.ui
View File

@ -32,7 +32,8 @@
<object class="GtkScrolledWindow" id="scrolledwindow">
<property name="hscrollbar-policy">never</property>
<property name="vscrollbar-policy">automatic</property>
<property name="vadjustment"><object class="GtkAdjustment" id="adjustment"/></property>
<property name="hadjustment"><object class="GtkAdjustment" id="hadjustment"/></property>
<property name="vadjustment"><object class="GtkAdjustment" id="vadjustment"/></property>
</object>
</child>
</object>