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gtk4-demo: Scale logarithmically in image scaling

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This commit is contained in:
Matthias Clasen 2023-03-13 08:21:10 +01:00
parent 88d9244b98
commit 517b4d584c
2 changed files with 14 additions and 6 deletions
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2
demos/gtk-demo/demo3widget.c
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@ -277,7 +277,7 @@ demo3_widget_class_init (Demo3WidgetClass *class)
g_object_class_install_property (object_class, PROP_SCALE,
g_param_spec_float ("scale", NULL, NULL,
0.0, 10.0, 1.0,
0.0, 1024.0, 1.0,
G_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_ANGLE,

18
demos/gtk-demo/menu.c
View File

@ -84,6 +84,16 @@ rotate (GtkWidget *button,
g_object_set (demo, "angle", angle, NULL);
}
static void
scale_changed (GtkRange *range,
GtkWidget *widget)
{
float scale;
scale = (float) pow (2., gtk_range_get_value (range));
g_object_set (widget, "scale", scale, NULL);
}
GtkWidget *
do_menu (GtkWidget *do_widget)
{
@ -129,7 +139,7 @@ do_menu (GtkWidget *do_widget)
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, 0.01, 10.0, 0.1);
scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, -10, 10.0, 0.1);
gtk_widget_set_tooltip_text (scale, "Zoom");
gtk_range_set_value (GTK_RANGE (scale), 1.0);
gtk_widget_set_hexpand (scale, TRUE);
@ -140,10 +150,8 @@ do_menu (GtkWidget *do_widget)
gtk_box_append (GTK_BOX (box2), dropdown);
g_object_bind_property (dropdown, "selected", widget, "filter", G_BINDING_DEFAULT);
g_object_bind_property (gtk_range_get_adjustment (GTK_RANGE (scale)), "value",
widget, "scale",
G_BINDING_BIDIRECTIONAL);
g_signal_connect (scale, "value-changed", G_CALLBACK (scale_changed), widget);
}
if (!gtk_widget_get_visible (window))