[gthumb] search: stop searching if the user changes location

[Paolo Bacchilega <paobac src gnome org>]

commit f80cadbb2ef4971263d46f9f057817f4f1a9c0fd
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Jan 10 10:34:20 2021 +0100

    search: stop searching if the user changes location

 extensions/search/callbacks.c       | 28 ++++++++++++++++++++++++++++
 extensions/search/callbacks.h       |  2 ++
 extensions/search/gth-search-task.c |  8 ++++++++
 extensions/search/gth-search-task.h |  9 +++++----
 extensions/search/main.c            |  1 +
 gthumb/gth-browser.c                | 12 +++++++++++-
 gthumb/gth-browser.h                |  1 +
 7 files changed, 56 insertions(+), 5 deletions(-)
---
diff --git a/extensions/search/callbacks.c b/extensions/search/callbacks.c
index 612d0115..2d9a7e52 100644
--- a/extensions/search/callbacks.c
+++ b/extensions/search/callbacks.c
@@ -125,6 +125,34 @@ search__gth_browser_update_extra_widget_cb (GthBrowser *browser)
 }
 
 
+void
+search__gth_browser_load_location_before_cb (GthBrowser *browser,
+                                            GFile      *next_location)
+{
+       GFile   *current_location;
+       GthTask *task;
+       GFile   *catalog;
+
+       /* Stop the search task if the user changes location. */
+
+       current_location = gth_browser_get_location (browser);
+       if (current_location == NULL)
+               return;
+
+       if (_g_file_equal (current_location, next_location))
+               return;
+
+       task = gth_browser_get_foreground_task (browser);
+       if ((task == NULL) || ! GTH_IS_SEARCH_TASK (task))
+               return;
+
+       catalog = gth_search_task_get_catalog (GTH_SEARCH_TASK (task));
+
+       if (_g_file_equal (current_location, catalog))
+               gth_task_cancel (task);
+}
+
+
 GthCatalog *
 search__gth_catalog_load_from_data_cb (const void *buffer)
 {
diff --git a/extensions/search/callbacks.h b/extensions/search/callbacks.h
index 1ee9103b..f27bc530 100644
--- a/extensions/search/callbacks.h
+++ b/extensions/search/callbacks.h
@@ -29,6 +29,8 @@
 void         search__gth_browser_construct_cb            (GthBrowser         *browser);
 void         search__gth_browser_update_sensitivity_cb   (GthBrowser         *browser);
 void         search__gth_browser_update_extra_widget_cb  (GthBrowser         *browser);
+void         search__gth_browser_load_location_before_cb (GthBrowser         *browser,
+                                                         GFile              *location);
 GthCatalog * search__gth_catalog_load_from_data_cb       (const void         *buffer);
 GthCatalog * search__gth_catalog_new_for_uri_cb          (const char         *uri);
 void         search__dlg_catalog_properties              (GtkBuilder         *builder,
diff --git a/extensions/search/gth-search-task.c b/extensions/search/gth-search-task.c
index 10a225f3..d4afbe7e 100644
--- a/extensions/search/gth-search-task.c
+++ b/extensions/search/gth-search-task.c
@@ -510,3 +510,11 @@ gth_search_task_new (GthBrowser *browser,
 
        return (GthTask*) task;
 }
+
+
+GFile *
+gth_search_task_get_catalog (GthSearchTask *task)
+{
+       g_return_val_if_fail (GTH_IS_SEARCH_TASK (task), NULL);
+       return task->priv->search_catalog;
+}
diff --git a/extensions/search/gth-search-task.h b/extensions/search/gth-search-task.h
index 83bd1e45..b3425505 100644
--- a/extensions/search/gth-search-task.h
+++ b/extensions/search/gth-search-task.h
@@ -48,9 +48,10 @@ struct _GthSearchTaskClass
        GthTaskClass __parent_class;
 };
 
-GType       gth_search_task_get_type   (void) G_GNUC_CONST;
-GthTask *   gth_search_task_new        (GthBrowser *browser,
-                                       GthSearch  *search,
-                                       GFile      *search_catalog);
+GType       gth_search_task_get_type     (void) G_GNUC_CONST;
+GthTask *   gth_search_task_new          (GthBrowser     *browser,
+                                         GthSearch      *search,
+                                         GFile          *search_catalog);
+GFile *     gth_search_task_get_catalog  (GthSearchTask  *task);
 
 #endif /* GTH_SEARCH_TASK_H */
diff --git a/extensions/search/main.c b/extensions/search/main.c
index 1d11a498..599a0d2e 100644
--- a/extensions/search/main.c
+++ b/extensions/search/main.c
@@ -33,6 +33,7 @@ gthumb_extension_activate (void)
        gth_hook_add_callback ("gth-catalog-new-for-uri", 10, G_CALLBACK 
(search__gth_catalog_new_for_uri_cb), NULL);
        gth_hook_add_callback ("gth-browser-construct", 10, G_CALLBACK (search__gth_browser_construct_cb), 
NULL);
        gth_hook_add_callback ("gth-browser-update-extra-widget", 20, G_CALLBACK 
(search__gth_browser_update_extra_widget_cb), NULL);
+       gth_hook_add_callback ("gth-browser-load-location-before", 10, G_CALLBACK 
(search__gth_browser_load_location_before_cb), NULL);
        gth_hook_add_callback ("dlg-catalog-properties", 10, G_CALLBACK (search__dlg_catalog_properties), 
NULL);
        gth_hook_add_callback ("dlg-catalog-properties-save", 10, G_CALLBACK 
(search__dlg_catalog_properties_save), NULL);
        gth_hook_add_callback ("dlg-catalog-properties-saved", 10, G_CALLBACK 
(search__dlg_catalog_properties_saved), NULL);
diff --git a/gthumb/gth-browser.c b/gthumb/gth-browser.c
index 2ffc0e85..b6e62ee9 100644
--- a/gthumb/gth-browser.c
+++ b/gthumb/gth-browser.c
@@ -5156,7 +5156,10 @@ gth_browser_new (GFile *location,
 GFile *
 gth_browser_get_location (GthBrowser *browser)
 {
-       return browser->priv->location->file;
+       if (browser->priv->location != NULL)
+               return browser->priv->location->file;
+       else
+               return NULL;
 }
 
 
@@ -5751,6 +5754,13 @@ gth_browser_exec_task (GthBrowser   *browser,
 }
 
 
+GthTask *
+gth_browser_get_foreground_task (GthBrowser *browser)
+{
+       return browser->priv->task;
+}
+
+
 void
 gth_browser_set_close_with_task (GthBrowser *browser,
                                 gboolean    value)
diff --git a/gthumb/gth-browser.h b/gthumb/gth-browser.h
index f3119802..003224e0 100644
--- a/gthumb/gth-browser.h
+++ b/gthumb/gth-browser.h
@@ -218,6 +218,7 @@ void             gth_browser_reload                 (GthBrowser       *browser);
 void             gth_browser_exec_task              (GthBrowser       *browser,
                                                     GthTask          *task,
                                                     GthTaskFlags      flags);
+GthTask *        gth_browser_get_foreground_task    (GthBrowser       *browser);
 void             gth_browser_set_close_with_task    (GthBrowser       *browser,
                                                     gboolean          value);
 gboolean         gth_browser_get_close_with_task    (GthBrowser       *browser);