Input history for text buffers and text grids.

[rodin/chimara.git] / libchimara / input.c

diff --git a/libchimara/input.c b/libchimara/input.c
index c35564593ec0a5d6990cb5d34901cb422f0a1ea7..605616d0e38c9eb94473ab292c592a984bc1af8c 100644 (file)
--- a/libchimara/input.c
+++ b/libchimara/input.c
@@ -153,6 +153,8 @@ text_grid_request_line_event_common(winid_t win, glui32 maxlen, gboolean insert,
     gtk_widget_modify_base(win->input_entry, GTK_STATE_NORMAL, &background);
     
     g_signal_connect(win->input_entry, "activate", G_CALLBACK(on_input_entry_activate), win);
+    g_signal_connect(win->input_entry, "key-press-event", G_CALLBACK(on_input_entry_key_press_event), win);
+    win->line_input_entry_changed = g_signal_connect(win->input_entry, "changed", G_CALLBACK(on_input_entry_changed), win);
     
     gtk_widget_show(win->input_entry);
     gtk_text_view_add_child_at_anchor(GTK_TEXT_VIEW(win->widget), win->input_entry, win->input_anchor);
@@ -610,8 +612,18 @@ finish_text_grid_line_input(winid_t win, gboolean emit_signal)
                g_assert(glk);
                g_signal_emit_by_name(glk, "line-input", win->rock, text);
     }
+       
+       /* Add the text to the window input history */
+       if(win->history_pos != NULL)
+       {
+               g_free(win->history->data);
+               win->history = g_list_delete_link(win->history, win->history);
+       }
+       if(*text != 0)
+               win->history = g_list_prepend(win->history, g_strdup(text));    
+       win->history_pos = NULL;
+       
        g_free(text);
-
        return chars_written;
 }
 
@@ -657,6 +669,60 @@ on_input_entry_activate(GtkEntry *input_entry, winid_t win)
        event_throw(glk, evtype_LineInput, win, chars_written, 0);
 }
 
+/* Internal function: Callback for signal key-press-event on the line input 
+GtkEntry in a text grid window. */
+gboolean
+on_input_entry_key_press_event(GtkEntry *input_entry, GdkEventKey *event, winid_t win)
+{
+       if(event->keyval == GDK_Up || event->keyval == GDK_KP_Up
+               || event->keyval == GDK_Down || event->keyval == GDK_KP_Down)
+       {
+               /* Prevent falling off the end of the history list */
+               if( (event->keyval == GDK_Up || event->keyval == GDK_KP_Up)
+                       && win->history_pos && win->history_pos->next == NULL)
+                       return TRUE;
+               if( (event->keyval == GDK_Down || event->keyval == GDK_KP_Down)
+                       && (win->history_pos == NULL || win->history_pos->prev == NULL) )
+                       return TRUE;
+       
+               if(win->history_pos == NULL) 
+               {
+                       gchar *current_input = gtk_entry_get_text(input_entry);
+                       win->history = g_list_prepend(win->history, current_input);
+                       win->history_pos = win->history;
+               }
+
+               if(event->keyval == GDK_Up || event->keyval == GDK_KP_Up)
+               {
+                       if(win->history_pos)
+                               win->history_pos = g_list_next(win->history_pos);
+                       else
+                               win->history_pos = win->history;
+               }
+               else /* down */
+                       win->history_pos = g_list_previous(win->history_pos);
+
+               /* Insert the history item into the window */
+               g_signal_handler_block(input_entry, win->line_input_entry_changed);
+               gtk_entry_set_text(input_entry, win->history_pos->data);
+               g_signal_handler_unblock(input_entry, win->line_input_entry_changed);
+               return TRUE;
+       }
+       return FALSE;
+}
+
+void
+on_input_entry_changed(GtkEditable *editable, winid_t win)
+{
+       /* Set the history position to NULL and erase the text we were already editing */
+       if(win->history_pos != NULL)
+       {
+               g_free(win->history->data);
+               win->history = g_list_delete_link(win->history, win->history);
+               win->history_pos = NULL;
+       }
+}
+
 glui32
 keyval_to_glk_keycode(guint keyval, gboolean unicode)
 {