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/* Image Scaling
* #Keywords: zoom, scale, filter, action, menu
*
* The custom widget we create here is similar to a GtkPicture,
* but allows setting a zoom level and filtering mode for the
* displayed paintable.
*
* It also demonstrates how to add a context menu to a custom
* widget and connect it with widget actions.
*
* The context menu has items to change the zoom level.
*/
#include <gtk/gtk.h>
#include "demo3widget.h"
static void
file_opened (GObject *source,
GAsyncResult *result,
void *data)
{
GFile *file;
GError *error = NULL;
GdkTexture *texture;
file = gtk_file_dialog_open_finish (GTK_FILE_DIALOG (source), result, &error);
if (!file)
{
g_print ("%s\n", error->message);
g_error_free (error);
return;
}
texture = gdk_texture_new_from_file (file, &error);
g_object_unref (file);
if (!texture)
{
g_print ("%s\n", error->message);
g_error_free (error);
return;
}
g_object_set (G_OBJECT (data), "texture", texture, NULL);
g_object_unref (texture);
}
static void
open_file (GtkWidget *picker,
GtkWidget *demo)
{
GtkWindow *parent = GTK_WINDOW (gtk_widget_get_root (picker));
GtkFileDialog *dialog;
GtkFileFilter *filter;
GListStore *filters;
dialog = gtk_file_dialog_new ();
filter = gtk_file_filter_new ();
gtk_file_filter_set_name (filter, "Images");
gtk_file_filter_add_pixbuf_formats (filter);
filters = g_list_store_new (GTK_TYPE_FILE_FILTER);
g_list_store_append (filters, filter);
g_object_unref (filter);
gtk_file_dialog_set_filters (dialog, G_LIST_MODEL (filters));
g_object_unref (filters);
gtk_file_dialog_open (dialog, parent, NULL, file_opened, demo);
g_object_unref (dialog);
}
static void
rotate (GtkWidget *button,
GtkWidget *demo)
{
float angle;
g_object_get (demo, "angle", &angle, NULL);
angle = fmodf (angle + 90.f, 360.f);
g_object_set (demo, "angle", angle, NULL);
}
static gboolean
transform_to (GBinding *binding,
const GValue *src,
GValue *dest,
gpointer user_data)
{
double from;
float to;
from = g_value_get_double (src);
to = (float) pow (2., from);
g_value_set_float (dest, to);
return TRUE;
}
static gboolean
transform_from (GBinding *binding,
const GValue *src,
GValue *dest,
gpointer user_data)
{
float to;
double from;
to = g_value_get_float (src);
from = log2 (to);
g_value_set_double (dest, from);
return TRUE;
}
GtkWidget *
do_image_scaling (GtkWidget *do_widget)
{
static GtkWidget *window = NULL;
if (!window)
{
GtkWidget *box;
GtkWidget *box2;
GtkWidget *sw;
GtkWidget *widget;
GtkWidget *scale;
GtkWidget *dropdown;
GtkWidget *button;
window = gtk_window_new ();
gtk_window_set_title (GTK_WINDOW (window), "Image Scaling");
gtk_window_set_default_size (GTK_WINDOW (window), 600, 400);
gtk_window_set_display (GTK_WINDOW (window),
gtk_widget_get_display (do_widget));
g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_window_set_child (GTK_WINDOW (window), box);
sw = gtk_scrolled_window_new ();
gtk_widget_set_vexpand (sw, TRUE);
gtk_box_append (GTK_BOX (box), sw);
widget = demo3_widget_new ("/transparent/portland-rose.jpg");
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), widget);
box2 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
gtk_box_append (GTK_BOX (box), box2);
button = gtk_button_new_from_icon_name ("document-open-symbolic");
gtk_widget_set_tooltip_text (button, "Open File");
g_signal_connect (button, "clicked", G_CALLBACK (open_file), widget);
gtk_box_append (GTK_BOX (box2), button);
button = gtk_button_new_from_icon_name ("object-rotate-right-symbolic");
gtk_widget_set_tooltip_text (button, "Rotate");
g_signal_connect (button, "clicked", G_CALLBACK (rotate), widget);
gtk_box_append (GTK_BOX (box2), button);
scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, -10., 10., 0.1);
gtk_scale_add_mark (GTK_SCALE (scale), 0., GTK_POS_TOP, NULL);
gtk_widget_set_tooltip_text (scale, "Zoom");
gtk_range_set_value (GTK_RANGE (scale), 0.);
gtk_widget_set_hexpand (scale, TRUE);
gtk_box_append (GTK_BOX (box2), scale);
dropdown = gtk_drop_down_new (G_LIST_MODEL (gtk_string_list_new ((const char *[]){ "Linear", "Nearest", "Trilinear", NULL })), NULL);
gtk_widget_set_tooltip_text (dropdown, "Filter");
gtk_box_append (GTK_BOX (box2), dropdown);
g_object_bind_property (dropdown, "selected", widget, "filter", G_BINDING_DEFAULT);
g_object_bind_property_full (gtk_range_get_adjustment (GTK_RANGE (scale)), "value",
widget, "scale",
G_BINDING_BIDIRECTIONAL,
transform_to,
transform_from,
NULL, NULL);
}
if (!gtk_widget_get_visible (window))
gtk_widget_set_visible (window, TRUE);
else
gtk_window_destroy (GTK_WINDOW (window));
return window;
}
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