AuroraMiddleware/gtk
1
0
Fork 1
mirror of https://gitlab.gnome.org/GNOME/gtk.git synced 2024-12-27 14:10:30 +00:00
Code Issues Projects Releases Wiki Activity

gtk-demo: Add a scrolling image demo

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
demos/gtk-demo/iconscroll.c
View File

@ -6,15 +6,17 @@
#include <gtk/gtk.h> #include <gtk/gtk.h>
static guint tick_cb; static guint tick_cb;
static GtkAdjustment *adjustment; static GtkAdjustment *hadjustment;
static GtkAdjustment *vadjustment;
static GtkWidget *window = NULL; static GtkWidget *window = NULL;
static GtkWidget *scrolledwindow; static GtkWidget *scrolledwindow;
static int selected; 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 static gboolean
scroll_cb (GtkWidget *widget, scroll_cb (GtkWidget *widget,
@ -23,12 +25,19 @@ scroll_cb (GtkWidget *widget,
{ {
double value; double value;
value = gtk_adjustment_get_value (adjustment); value = gtk_adjustment_get_value (vadjustment);
if (value + increment <= gtk_adjustment_get_lower (adjustment) || if (value + vincrement <= gtk_adjustment_get_lower (vadjustment) ||
(value + increment >= gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_page_size (adjustment))) (value + vincrement >= gtk_adjustment_get_upper (vadjustment) - gtk_adjustment_get_page_size (vadjustment)))
increment = - increment; 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; return G_SOURCE_CONTINUE;
} }
@ -51,6 +60,11 @@ populate_icons (void)
for (left = 0; left < 15; left++) for (left = 0; left < 15; left++)
gtk_grid_attach (GTK_GRID (grid), create_icon (), left, top, 1, 1); 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); gtk_container_add (GTK_CONTAINER (scrolledwindow), grid);
} }
@ -82,9 +96,38 @@ populate_text (gboolean hilight)
textview = gtk_text_view_new (); textview = gtk_text_view_new ();
gtk_text_view_set_buffer (GTK_TEXT_VIEW (textview), buffer); 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); 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 static void
set_widget_type (int type) set_widget_type (int type)
{ {
@ -114,6 +157,11 @@ set_widget_type (int type)
populate_text (TRUE); populate_text (TRUE);
break; break;
case 3:
gtk_window_set_title (GTK_WINDOW (window), "Scrolling a big image");
populate_image ();
break;
default: default:
g_assert_not_reached (); g_assert_not_reached ();
} }
@ -172,7 +220,8 @@ do_iconscroll (GtkWidget *do_widget)
G_CALLBACK (gtk_widget_destroyed), &window); G_CALLBACK (gtk_widget_destroyed), &window);
scrolledwindow = GTK_WIDGET (gtk_builder_get_object (builder, "scrolledwindow")); scrolledwindow = GTK_WIDGET (gtk_builder_get_object (builder, "scrolledwindow"));
gtk_widget_realize (window); 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); set_widget_type (0);
} }

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

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