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gtk-demo: Add a callback cursor

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Make one of the GTK logo cursors in the cursors demo use a callback
cursor that follows the cursor theme size, to show that that is
possible.
This commit is contained in:
Matthias Clasen
2024-03-21 07:15:44 -04:00
parent 1275a2cb8d
commit 37e18b784e
4 changed files with 188 additions and 8 deletions
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46
demos/gtk-demo/cursors.c
View File

@@ -15,12 +15,54 @@ on_destroy (gpointer data)
window = NULL;
}
static GdkTexture *
cursor_callback (GdkCursor *cursor,
int cursor_size,
double scale,
int *width,
int *height,
int *hotspot_x,
int *hotspot_y,
gpointer data)
{
GdkPixbuf *pixbuf;
GdkTexture *texture;
GError *error = NULL;
int scaled_size;
scaled_size = ceil (cursor_size * scale);
pixbuf = gdk_pixbuf_new_from_resource_at_scale ("/cursors/images/gtk-logo.svg",
scaled_size, scaled_size,
TRUE,
&error);
if (!pixbuf)
{
g_print ("%s\n", error->message);
g_error_free (error);
return NULL;
}
texture = gdk_texture_new_for_pixbuf (pixbuf);
g_object_unref (pixbuf);
*width = cursor_size;
*height = cursor_size;
*hotspot_x = 18 * cursor_size / 32.0;
*hotspot_y = 2 * cursor_size / 32.0;
return texture;
}
GtkWidget *
do_cursors (GtkWidget *do_widget)
{
if (!window)
{
GtkBuilder *builder;
GtkWidget *logo_callback;
GdkCursor *cursor;
builder = gtk_builder_new_from_resource ("/cursors/cursors.ui");
window = GTK_WIDGET (gtk_builder_get_object (builder, "window"));
@@ -29,6 +71,10 @@ do_cursors (GtkWidget *do_widget)
gtk_widget_get_display (do_widget));
g_signal_connect (window, "destroy",
G_CALLBACK (on_destroy), NULL);
logo_callback = GTK_WIDGET (gtk_builder_get_object (builder, "logo_callback"));
cursor = gdk_cursor_new_from_callback (cursor_callback, NULL, NULL, NULL);
gtk_widget_set_cursor (logo_callback, cursor);
g_object_unref (cursor);
g_object_unref (builder);
}

11
demos/gtk-demo/cursors.ui
View File

@@ -40,10 +40,6 @@
<property name="hotspot-x">18</property>
<property name="hotspot-y">2</property>
</object>
<object class="GdkCursor" id="gtk-logo_cursor_fallback">
<property name="name">gtk-logo</property>
<property name="fallback">gtk-logo_cursor_image</property>
</object>
<object class="GdkCursor" id="gtk-logo_cursor_image_fallback">
<property name="texture">resource:///cursors/images/gtk_logo_cursor.png</property>
<property name="hotspot-x">18</property>
@@ -827,15 +823,14 @@
<property name="width-request">32</property>
<property name="height-request">32</property>
<property name="cursor">gtk-logo_cursor_image</property>
<property name="tooltip-text" translatable="yes">An image cursor</property>
<property name="tooltip-text" translatable="yes">An image cursor for the GTK logo</property>
</object>
</child>
<child>
<object class="GtkFrame">
<object class="GtkFrame" id="logo_callback">
<property name="width-request">32</property>
<property name="height-request">32</property>
<property name="cursor">gtk-logo_cursor_fallback</property>
<property name="tooltip-text" translatable="yes">The &quot;gtk-logo&quot; named cursor falling back to an image cursor</property>
<property name="tooltip-text" translatable="yes">A callback cursor for the GTK logo</property>
</object>
</child>
<child>

1
demos/gtk-demo/demo.gresource.xml
View File

@@ -116,6 +116,7 @@
<file>w_resize_cursor.png</file>
<file>zoom_in_cursor.png</file>
<file>zoom_out_cursor.png</file>
<file>gtk-logo.svg</file>
</gresource>
<gresource prefix="/dnd">
<file>dnd.css</file>

138
demos/gtk-demo/gtk-logo.svg Normal file
View File

@@ -0,0 +1,138 @@
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