add "Resolution Independence" item to gtk-demo and turn on RI
Now that most core widgets support RI, add a demo so it's easy to test RI.
This commit is contained in:
David Zeuthen
committed by
Davyd Madeley
Davyd Madeley
parent
32baa433b7
commit
151e5c58a8
@@ -29,6 +29,7 @@ demos = \
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pickers.c \
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pixbufs.c \
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printing.c \
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resolution_independence.c \
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rotated_text.c \
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search_entry.c \
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sizegroup.c \
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@@ -946,6 +946,7 @@ main (int argc, char **argv)
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}
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/* -- End of hack -- */
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gtk_enable_resolution_independence ();
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gtk_init (&argc, &argv);
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setup_default_icon ();
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216
demos/gtk-demo/resolution_independence.c
Normal file
216
demos/gtk-demo/resolution_independence.c
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@@ -0,0 +1,216 @@
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/* Resolution Independence
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*
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* This demonstates resolution independence features available since
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* version 2.14 of GTK+. Use the slider to change the effective DPI
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* per monitor. Note that the changes will only affect windows from
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* this process.
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*/
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#include <gtk/gtk.h>
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#include "config.h"
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#include "demo-common.h"
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static GtkWidget *window = NULL;
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static GtkWindowGroup *window_group = NULL;
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static GtkWidget *hscale;
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static GtkWidget *label;
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#define MIN_DPI 24.0
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#define MAX_DPI 480.0
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#define STEP_DPI 1.0
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static void
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update (void)
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{
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GdkScreen *screen;
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gint monitor_num;
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char *plug_name;
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char *s;
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gdouble dpi;
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char *font_name;
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GtkSettings *settings;
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int width_mm;
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int height_mm;
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GdkRectangle geometry;
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plug_name = NULL;
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font_name = NULL;
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width_mm = -1;
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height_mm = -1;
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geometry.x = -1;
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geometry.y = -1;
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geometry.width = -1;
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geometry.height = -1;
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screen = gtk_window_get_screen (GTK_WINDOW (window));
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monitor_num = gtk_widget_get_monitor_num (window);
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if (screen != NULL && monitor_num >= 0)
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{
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plug_name = gdk_screen_get_monitor_plug_name (screen, monitor_num);
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width_mm = gdk_screen_get_monitor_width_mm (screen, monitor_num);
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height_mm = gdk_screen_get_monitor_width_mm (screen, monitor_num);
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gdk_screen_get_monitor_geometry (screen, monitor_num, &geometry);
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}
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if (screen != NULL)
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settings = gtk_settings_get_for_screen (screen);
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else
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settings = gtk_settings_get_default ();
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g_object_get (settings, "gtk-font-name", &font_name, NULL);
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s = g_strdup_printf ("Monitor %d (%s) @ %dx%d+%d+%d\n"
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"%d mm x %d mm\n"
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"Font \"%s\"\n"
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"1 em -> %g pixels\n"
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"1 mm -> %g pixels",
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monitor_num,
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plug_name != NULL ? plug_name : "unknown name",
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geometry.width, geometry.height, geometry.x, geometry.y,
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width_mm, height_mm,
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font_name,
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gtk_size_to_pixel_double (screen, monitor_num, gtk_size_em (1.0)),
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gtk_size_to_pixel_double (screen, monitor_num, gtk_size_mm (1.0)));
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gtk_label_set_text (GTK_LABEL (label), s);
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g_free (s);
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dpi = -1;
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if (screen != NULL)
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{
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dpi = gdk_screen_get_resolution_for_monitor (screen, monitor_num);
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gtk_range_set_value (GTK_RANGE (hscale), dpi);
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}
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g_free (plug_name);
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g_free (font_name);
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}
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static void
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window_mapped (GtkWidget *widget, gpointer user_data)
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{
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update ();
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}
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static void
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unit_changed (GtkWidget *widget, gpointer user_data)
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{
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update ();
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}
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static void
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monitor_num_notify (GtkWindow *window, GParamSpec *psec, gpointer user_data)
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{
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g_debug ("notify::monitor-num");
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update ();
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}
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static void
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update_value (void)
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{
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gdouble slider_value;
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slider_value = gtk_range_get_value (GTK_RANGE (hscale));
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if (slider_value >= MIN_DPI && slider_value <= MAX_DPI)
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{
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GdkScreen *screen;
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gint monitor_num;
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screen = gtk_window_get_screen (GTK_WINDOW (window));
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monitor_num = gtk_widget_get_monitor_num (window);
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if (screen != NULL && monitor_num >= 0)
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{
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gdk_screen_set_resolution_for_monitor (screen, monitor_num, slider_value);
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g_signal_emit_by_name (screen, "monitors-changed");
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}
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}
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}
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static gboolean is_pressed = FALSE;
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static gboolean
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hscale_button_press_event (GtkWidget *widget, GdkEventButton *event, gpointer user_data)
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{
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is_pressed = TRUE;
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return FALSE;
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}
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static gboolean
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hscale_button_release_event (GtkWidget *widget, GdkEventButton *event, gpointer user_data)
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{
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is_pressed = FALSE;
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update_value ();
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return FALSE;
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}
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static void
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hscale_value_changed (GtkRange *range, gpointer user_data)
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{
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if (!is_pressed)
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update_value ();
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}
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static char *
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hscale_format_value (GtkScale *scale, gdouble value, gpointer user_data)
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{
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return g_strdup_printf ("%g DPI", value);
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}
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GtkWidget *
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do_resolution_independence (GtkWidget *do_widget)
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{
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GtkWidget *vbox;
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if (window != NULL)
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goto have_window;
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_screen (GTK_WINDOW (window), gtk_widget_get_screen (do_widget));
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gtk_window_set_title (GTK_WINDOW (window), "Resolution Independence");
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gtk_window_set_icon_name (GTK_WINDOW (window), "gtk-fullscreen");
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g_signal_connect (G_OBJECT (window), "map", G_CALLBACK (window_mapped), NULL);
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g_signal_connect (G_OBJECT (window), "notify::monitor-num", G_CALLBACK (monitor_num_notify), NULL);
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g_signal_connect (G_OBJECT (window), "unit-changed", G_CALLBACK (unit_changed), NULL);
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g_signal_connect (window, "destroy",
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G_CALLBACK (gtk_widget_destroyed),
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&window);
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vbox = gtk_vbox_new (FALSE, gtk_size_em (1));
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label = gtk_label_new (NULL);
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gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_CENTER);
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gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
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hscale = gtk_hscale_new_with_range (MIN_DPI, MAX_DPI, STEP_DPI);
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gtk_box_pack_start (GTK_BOX (vbox), hscale, FALSE, FALSE, 0);
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g_signal_connect (G_OBJECT (hscale), "value-changed", G_CALLBACK (hscale_value_changed), NULL);
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g_signal_connect (G_OBJECT (hscale), "button-press-event", G_CALLBACK (hscale_button_press_event), NULL);
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g_signal_connect (G_OBJECT (hscale), "button-release-event", G_CALLBACK (hscale_button_release_event), NULL);
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g_signal_connect (G_OBJECT (hscale), "format-value", G_CALLBACK (hscale_format_value), NULL);
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gtk_container_add (GTK_CONTAINER (window), vbox);
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gtk_container_set_border_width (GTK_CONTAINER (window), gtk_size_em (1));
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gtk_widget_set_size_request (window, GTK_SIZE_ONE_TWELFTH_EM (500), -1);
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gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
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/* avoid dialogs (e.g. printing) grabbing focus from us */
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if (window_group == NULL)
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window_group = gtk_window_group_new ();
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gtk_window_group_add_window (window_group, GTK_WINDOW (window));
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/* make sure we're on top */
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gtk_window_set_keep_above (GTK_WINDOW (window), TRUE);
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have_window:
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if (!GTK_WIDGET_VISIBLE (window))
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{
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gtk_widget_show_all (window);
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}
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else
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{
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gtk_widget_destroy (window);
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window = NULL;
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}
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return window;
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}
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