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/* Overlay/Decorative Overlay
* #Keywords: GtkOverlay
*
* Another example of an overlay with some decorative
* and some interactive controls.
*/
#include <gtk/gtk.h>
static GtkTextTag *tag;
static void
margin_changed (GtkAdjustment *adjustment,
GtkTextView *text)
{
int value;
value = (int)gtk_adjustment_get_value (adjustment);
gtk_text_view_set_left_margin (GTK_TEXT_VIEW (text), value);
g_object_set (tag, "pixels-above-lines", value, NULL);
}
GtkWidget *
do_overlay_decorative (GtkWidget *do_widget)
{
static GtkWidget *window = NULL;
if (!window)
{
GtkWidget *overlay;
GtkWidget *sw;
GtkWidget *text;
GtkWidget *image;
GtkWidget *scale;
GtkTextBuffer *buffer;
GtkTextIter start, end;
GtkAdjustment *adjustment;
window = gtk_window_new ();
gtk_window_set_default_size (GTK_WINDOW (window), 500, 510);
gtk_window_set_title (GTK_WINDOW (window), "Decorative Overlay");
overlay = gtk_overlay_new ();
sw = gtk_scrolled_window_new ();
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
GTK_POLICY_AUTOMATIC,
GTK_POLICY_AUTOMATIC);
text = gtk_text_view_new ();
buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (text));
gtk_text_buffer_set_text (buffer, "Dear diary...", -1);
tag = gtk_text_buffer_create_tag (buffer, "top-margin",
"pixels-above-lines", 0,
NULL);
gtk_text_buffer_get_start_iter (buffer, &start);
end = start;
gtk_text_iter_forward_word_end (&end);
gtk_text_buffer_apply_tag (buffer, tag, &start, &end);
gtk_window_set_child (GTK_WINDOW (window), overlay);
gtk_overlay_set_child (GTK_OVERLAY (overlay), sw);
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), text);
g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
image = gtk_picture_new_for_resource ("/overlay2/decor1.png");
gtk_overlay_add_overlay (GTK_OVERLAY (overlay), image);
gtk_widget_set_can_target (image, FALSE);
gtk_widget_set_halign (image, GTK_ALIGN_START);
gtk_widget_set_valign (image, GTK_ALIGN_START);
image = gtk_picture_new_for_resource ("/overlay2/decor2.png");
gtk_overlay_add_overlay (GTK_OVERLAY (overlay), image);
gtk_widget_set_can_target (image, FALSE);
gtk_widget_set_halign (image, GTK_ALIGN_END);
gtk_widget_set_valign (image, GTK_ALIGN_END);
adjustment = gtk_adjustment_new (0, 0, 100, 1, 1, 0);
g_signal_connect (adjustment, "value-changed",
G_CALLBACK (margin_changed), text);
scale = gtk_scale_new (GTK_ORIENTATION_HORIZONTAL, adjustment);
gtk_scale_set_draw_value (GTK_SCALE (scale), FALSE);
gtk_widget_set_size_request (scale, 120, -1);
gtk_widget_set_margin_start (scale, 20);
gtk_widget_set_margin_end (scale, 20);
gtk_widget_set_margin_bottom (scale, 20);
gtk_overlay_add_overlay (GTK_OVERLAY (overlay), scale);
gtk_widget_set_halign (scale, GTK_ALIGN_START);
gtk_widget_set_valign (scale, GTK_ALIGN_END);
gtk_widget_set_tooltip_text (scale, "Margin");
gtk_adjustment_set_value (adjustment, 100);
}
if (!gtk_widget_get_visible (window))
gtk_widget_show (window);
else
gtk_window_destroy (GTK_WINDOW (window));
return window;
}
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