79 lines
2.7 KiB
C
79 lines
2.7 KiB
C
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/* Text View/Undo and Redo
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*
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* The GtkTextView supports undo and redo through the use of a
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* GtkTextBuffer. You can enable or disable undo support using
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* gtk_text_buffer_set_enable_undo().
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*
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* Use Control+z to undo and Control+Shift+z or Control+y to
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* redo previously undone operations.
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*/
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#include <gtk/gtk.h>
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#include <stdlib.h> /* for exit() */
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GtkWidget *
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do_textundo (GtkWidget *do_widget)
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{
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static GtkWidget *window = NULL;
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if (!window)
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{
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GtkWidget *view;
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GtkWidget *sw;
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GtkTextBuffer *buffer;
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GtkTextIter iter;
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window = gtk_window_new ();
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gtk_window_set_display (GTK_WINDOW (window),
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gtk_widget_get_display (do_widget));
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gtk_window_set_default_size (GTK_WINDOW (window), 330, 330);
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gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
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g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
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gtk_window_set_title (GTK_WINDOW (window), "Undo and Redo");
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view = gtk_text_view_new ();
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gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (view), GTK_WRAP_WORD);
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gtk_text_view_set_pixels_below_lines (GTK_TEXT_VIEW (view), 10);
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gtk_text_view_set_left_margin (GTK_TEXT_VIEW (view), 20);
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gtk_text_view_set_right_margin (GTK_TEXT_VIEW (view), 20);
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gtk_text_view_set_top_margin (GTK_TEXT_VIEW (view), 20);
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gtk_text_view_set_bottom_margin (GTK_TEXT_VIEW (view), 20);
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buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
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gtk_text_buffer_set_enable_undo (buffer, TRUE);
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/* this text cannot be undone */
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gtk_text_buffer_begin_irreversible_action (buffer);
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gtk_text_buffer_get_start_iter (buffer, &iter);
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gtk_text_buffer_insert (buffer, &iter,
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"The GtkTextView supports undo and redo through the use of a "
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"GtkTextBuffer. You can enable or disable undo support using "
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"gtk_text_buffer_set_enable_undo().\n"
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"Type to add more text.\n"
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"Use Control+z to undo and Control+Shift+z or Control+y to "
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"redo previously undone operations.",
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-1);
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gtk_text_buffer_end_irreversible_action (buffer);
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sw = gtk_scrolled_window_new ();
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gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
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GTK_POLICY_AUTOMATIC,
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GTK_POLICY_AUTOMATIC);
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gtk_window_set_child (GTK_WINDOW (window), sw);
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gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), view);
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}
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if (!gtk_widget_get_visible (window))
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{
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gtk_widget_set_visible (window, TRUE);
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}
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else
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{
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gtk_window_destroy (GTK_WINDOW (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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