154 lines
4.9 KiB
C
154 lines
4.9 KiB
C
#include <gtk/gtk.h>
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static void
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child_size_allocate (GtkWidget *child,
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GdkRectangle *allocation,
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gpointer user_data)
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{
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GtkStyleContext *context;
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context = gtk_widget_get_style_context (child);
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g_print ("Child %p\nHas left? %d\nHas right? %d\nHas top? %d\nHas bottom? %d\n",
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child,
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gtk_style_context_has_class (context, "left"),
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gtk_style_context_has_class (context, "right"),
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gtk_style_context_has_class (context, "top"),
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gtk_style_context_has_class (context, "bottom"));
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}
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static gboolean
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overlay_get_child_position (GtkOverlay *overlay,
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GtkWidget *child,
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GdkRectangle *allocation,
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gpointer user_data)
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{
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GtkWidget *custom_child = user_data;
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GtkRequisition req;
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if (child != custom_child)
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return FALSE;
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gtk_widget_get_preferred_size (child, NULL, &req);
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allocation->x = 120;
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allocation->y = 0;
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allocation->width = req.width;
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allocation->height = req.height;
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return TRUE;
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}
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int
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main (int argc, char *argv[])
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{
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GtkWidget *win, *overlay, *grid, *main_child, *child, *label, *sw;
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GdkRGBA color;
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gchar *str;
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gtk_init (&argc, &argv);
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win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_default_size (GTK_WINDOW (win), 600, 600);
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grid = gtk_grid_new ();
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child = gtk_event_box_new ();
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gdk_rgba_parse (&color, "red");
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gtk_widget_override_background_color (child, 0, &color);
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gtk_widget_set_hexpand (child, TRUE);
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gtk_widget_set_vexpand (child, TRUE);
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gtk_container_add (GTK_CONTAINER (grid), child);
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label = gtk_label_new ("Out of overlay");
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gtk_container_add (GTK_CONTAINER (child), label);
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overlay = gtk_overlay_new ();
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sw = gtk_scrolled_window_new (NULL, NULL);
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gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
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GTK_POLICY_ALWAYS,
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GTK_POLICY_ALWAYS);
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gtk_container_add (GTK_CONTAINER (overlay), sw);
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main_child = gtk_event_box_new ();
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gtk_container_add (GTK_CONTAINER (sw), main_child);
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gdk_rgba_parse (&color, "green");
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gtk_widget_override_background_color (main_child, 0, &color);
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gtk_widget_set_hexpand (main_child, TRUE);
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gtk_widget_set_vexpand (main_child, TRUE);
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label = gtk_label_new ("Main child");
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gtk_container_add (GTK_CONTAINER (main_child), label);
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child = gtk_label_new (NULL);
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str = g_strdup_printf ("%p", child);
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gtk_label_set_text (GTK_LABEL (child), str);
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g_free (str);
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g_print ("Bottom/Right child: %p\n", child);
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gtk_widget_set_halign (child, GTK_ALIGN_END);
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gtk_widget_set_valign (child, GTK_ALIGN_END);
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gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
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g_signal_connect (child, "size-allocate",
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G_CALLBACK (child_size_allocate), overlay);
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child = gtk_label_new (NULL);
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str = g_strdup_printf ("%p", child);
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gtk_label_set_text (GTK_LABEL (child), str);
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g_free (str);
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g_print ("Left/Top child: %p\n", child);
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gtk_widget_set_halign (child, GTK_ALIGN_START);
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gtk_widget_set_valign (child, GTK_ALIGN_START);
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gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
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g_signal_connect (child, "size-allocate",
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G_CALLBACK (child_size_allocate), overlay);
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child = gtk_label_new (NULL);
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str = g_strdup_printf ("%p", child);
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gtk_label_set_text (GTK_LABEL (child), str);
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g_free (str);
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g_print ("Right/Center child: %p\n", child);
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gtk_widget_set_halign (child, GTK_ALIGN_END);
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gtk_widget_set_valign (child, GTK_ALIGN_CENTER);
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gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
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g_signal_connect (child, "size-allocate",
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G_CALLBACK (child_size_allocate), overlay);
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child = gtk_label_new (NULL);
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str = g_strdup_printf ("%p", child);
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gtk_label_set_text (GTK_LABEL (child), str);
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g_free (str);
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gtk_widget_set_margin_start (child, 55);
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gtk_widget_set_margin_top (child, 4);
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g_print ("Left/Top margined child: %p\n", child);
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gtk_widget_set_halign (child, GTK_ALIGN_START);
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gtk_widget_set_valign (child, GTK_ALIGN_START);
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gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
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g_signal_connect (child, "size-allocate",
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G_CALLBACK (child_size_allocate), overlay);
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child = gtk_label_new (NULL);
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str = g_strdup_printf ("%p", child);
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gtk_label_set_text (GTK_LABEL (child), str);
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g_free (str);
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g_print ("Custom get-child-position child: %p\n", child);
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gtk_widget_set_halign (child, GTK_ALIGN_START);
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gtk_widget_set_valign (child, GTK_ALIGN_START);
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gtk_overlay_add_overlay (GTK_OVERLAY (overlay), child);
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g_signal_connect (child, "size-allocate",
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G_CALLBACK (child_size_allocate), overlay);
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g_signal_connect (overlay, "get-child-position",
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G_CALLBACK (overlay_get_child_position), child);
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gtk_grid_attach (GTK_GRID (grid), overlay, 1, 0, 1, 3);
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gtk_container_add (GTK_CONTAINER (win), grid);
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g_print ("\n");
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gtk_widget_show_all (win);
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gtk_main ();
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return 0;
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}
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