156 lines
3.7 KiB
C
156 lines
3.7 KiB
C
/* Demonstrates hooking up an input method context to a custom widget.
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*/
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#include <gtk/gtk.h>
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G_GNUC_BEGIN_IGNORE_DEPRECATIONS
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G_DECLARE_FINAL_TYPE (DemoWidget, demo_widget, DEMO, WIDGET, GtkWidget)
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struct _DemoWidget
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{
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GtkWidget parent_instance;
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GtkIMContext *im_context;
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PangoLayout *layout;
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};
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struct _DemoWidgetClass
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{
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GtkWidgetClass parent_class;
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};
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G_DEFINE_TYPE (DemoWidget, demo_widget, GTK_TYPE_WIDGET)
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static void
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commit_cb (GtkIMContext *context,
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const char *str,
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DemoWidget *demo)
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{
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pango_layout_set_text (demo->layout, str, -1);
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pango_layout_set_attributes (demo->layout, NULL);
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gtk_widget_queue_draw (GTK_WIDGET (demo));
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}
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static void
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preedit_changed_cb (GtkIMContext *context,
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DemoWidget *demo)
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{
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char *str;
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PangoAttrList *attrs;
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int cursor_pos;
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gtk_im_context_get_preedit_string (context, &str, &attrs, &cursor_pos);
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pango_layout_set_text (demo->layout, str, -1);
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pango_layout_set_attributes (demo->layout, attrs);
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g_free (str);
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pango_attr_list_unref (attrs);
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gtk_widget_queue_draw (GTK_WIDGET (demo));
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}
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static gboolean
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key_pressed_cb (GtkEventControllerKey *controller,
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guint keyval,
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guint keycode,
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GdkModifierType state,
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DemoWidget *demo)
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{
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if (keyval == GDK_KEY_BackSpace)
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{
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pango_layout_set_text (demo->layout, "", -1);
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pango_layout_set_attributes (demo->layout, NULL);
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gtk_widget_queue_draw (GTK_WIDGET (demo));
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return TRUE;
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}
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return FALSE;
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}
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static void
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demo_widget_init (DemoWidget *demo)
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{
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GtkEventController *controller;
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gtk_widget_set_focusable (GTK_WIDGET (demo), TRUE);
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demo->layout = gtk_widget_create_pango_layout (GTK_WIDGET (demo), "");
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demo->im_context = gtk_im_multicontext_new ();
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g_signal_connect (demo->im_context, "commit", G_CALLBACK (commit_cb), demo);
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g_signal_connect (demo->im_context, "preedit-changed", G_CALLBACK (preedit_changed_cb), demo);
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controller = gtk_event_controller_key_new ();
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gtk_event_controller_key_set_im_context (GTK_EVENT_CONTROLLER_KEY (controller),
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demo->im_context);
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g_signal_connect (controller, "key-pressed", G_CALLBACK (key_pressed_cb), demo);
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gtk_widget_add_controller (GTK_WIDGET (demo), controller);
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}
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static void
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demo_widget_dispose (GObject *object)
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{
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DemoWidget *demo = DEMO_WIDGET (object);
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g_clear_object (&demo->layout);
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g_clear_object (&demo->im_context);
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G_OBJECT_CLASS (demo_widget_parent_class)->dispose (object);
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}
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static void
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demo_widget_snapshot (GtkWidget *widget,
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GtkSnapshot *snapshot)
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{
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DemoWidget *demo = DEMO_WIDGET (widget);
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gtk_snapshot_render_layout (snapshot,
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gtk_widget_get_style_context (widget),
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0, 0,
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demo->layout);
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}
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static void
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demo_widget_class_init (DemoWidgetClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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object_class->dispose = demo_widget_dispose;
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widget_class->snapshot = demo_widget_snapshot;
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}
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static GtkWidget *
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demo_widget_new (void)
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{
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return g_object_new (demo_widget_get_type (), NULL);
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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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GtkWindow *window;
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GtkWidget *demo;
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gtk_init ();
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window = GTK_WINDOW (gtk_window_new ());
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demo = demo_widget_new ();
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gtk_window_set_child (window, demo);
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gtk_window_present (window);
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gtk_widget_grab_focus (demo);
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while (g_list_model_get_n_items (gtk_window_get_toplevels ()) > 0)
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g_main_context_iteration (NULL, TRUE);
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return 0;
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}
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