[evolution] I#1319 - Address book: Provide feedback when searching in the List View

[Milan Crha <mcrha src gnome org>]

commit 6b66603a6879269f8b2d816b513c34c3afc293cd
Author: Milan Crha <mcrha redhat com>
Date:   Tue Jan 12 11:07:26 2021 +0100

    I#1319 - Address book: Provide feedback when searching in the List View
    
    Closes https://gitlab.gnome.org/GNOME/evolution/-/issues/1319

 src/addressbook/gui/widgets/e-addressbook-view.c | 25 +++++++
 src/e-util/e-table.c                             | 90 ++++++++++++++++++++++++
 src/e-util/e-table.h                             |  5 ++
 3 files changed, 120 insertions(+)
---
diff --git a/src/addressbook/gui/widgets/e-addressbook-view.c 
b/src/addressbook/gui/widgets/e-addressbook-view.c
index 206d7bda96..610d30115a 100644
--- a/src/addressbook/gui/widgets/e-addressbook-view.c
+++ b/src/addressbook/gui/widgets/e-addressbook-view.c
@@ -908,6 +908,23 @@ e_addressbook_view_selectable_init (ESelectableInterface *iface)
        iface->select_all = addressbook_view_select_all;
 }
 
+static void
+update_empty_message (EAddressbookView *view)
+{
+       EAddressbookModel *model;
+       GtkWidget *widget;
+       const gchar *msg = NULL;
+
+       model = e_addressbook_view_get_model (view);
+
+       if (model && e_addressbook_model_can_stop (model) &&
+           !e_addressbook_model_contact_count (model))
+               msg = _("Searching for the Contacts…");
+
+       widget = gtk_bin_get_child (GTK_BIN (view));
+       e_table_set_info_message (E_TABLE (widget), msg);
+}
+
 GtkWidget *
 e_addressbook_view_new (EShellView *shell_view,
                         ESource *source)
@@ -935,6 +952,12 @@ e_addressbook_view_new (EShellView *shell_view,
        g_signal_connect_swapped (
                view->priv->model, "writable-status",
                G_CALLBACK (command_state_change), view);
+       g_signal_connect_object (
+               view->priv->model, "contact-added",
+               G_CALLBACK (update_empty_message), view, G_CONNECT_SWAPPED | G_CONNECT_AFTER);
+       g_signal_connect_object (
+               view->priv->model, "contacts-removed",
+               G_CALLBACK (update_empty_message), view, G_CONNECT_SWAPPED | G_CONNECT_AFTER);
 
        return widget;
 }
@@ -1095,6 +1118,8 @@ static void
 command_state_change (EAddressbookView *view)
 {
        g_signal_emit (view, signals[COMMAND_STATE_CHANGE], 0);
+
+       update_empty_message (view);
 }
 
 static void
diff --git a/src/e-util/e-table.c b/src/e-util/e-table.c
index fb9994bcde..05bea36703 100644
--- a/src/e-util/e-table.c
+++ b/src/e-util/e-table.c
@@ -38,6 +38,7 @@
 #include <libgnomecanvas/libgnomecanvas.h>
 
 #include "e-canvas-background.h"
+#include "e-canvas-utils.h"
 #include "e-canvas-vbox.h"
 #include "e-canvas.h"
 #include "e-table-click-to-add.h"
@@ -47,6 +48,7 @@
 #include "e-table-header-utils.h"
 #include "e-table-subset.h"
 #include "e-table-utils.h"
+#include "e-text.h"
 #include "e-unicode.h"
 #include "e-misc-utils.h"
 #include "gal-a11y-e-table.h"
@@ -63,6 +65,11 @@
 #define e_table_item_leave_edit_(x) (e_table_item_leave_edit((x)))
 #endif
 
+struct _ETablePrivate {
+       GnomeCanvasItem *info_text;
+       guint info_text_resize_id;
+};
+
 enum {
        CURSOR_CHANGE,
        CURSOR_ACTIVATED,
@@ -170,6 +177,7 @@ static void scroll_on (ETable *et, guint scroll_direction);
 static void e_table_scrollable_init (GtkScrollableInterface *iface);
 
 G_DEFINE_TYPE_WITH_CODE (ETable, e_table, GTK_TYPE_TABLE,
+                        G_ADD_PRIVATE (ETable)
                         G_IMPLEMENT_INTERFACE (GTK_TYPE_SCROLLABLE, e_table_scrollable_init))
 
 static void
@@ -343,6 +351,12 @@ et_dispose (GObject *object)
 
        et_disconnect_model (et);
 
+       if (et->priv->info_text != NULL) {
+               g_object_run_dispose (G_OBJECT (et->priv->info_text));
+               et->priv->info_text = NULL;
+       }
+       et->priv->info_text_resize_id = 0;
+
        if (et->search) {
                if (et->search_search_id)
                        g_signal_handler_disconnect (
@@ -542,6 +556,8 @@ et_finalize (GObject *object)
 static void
 e_table_init (ETable *e_table)
 {
+       e_table->priv = e_table_get_instance_private (e_table);
+
        gtk_widget_set_can_focus (GTK_WIDGET (e_table), TRUE);
 
        gtk_table_set_homogeneous (GTK_TABLE (e_table), FALSE);
@@ -3591,3 +3607,77 @@ e_table_customize_view (ETable *table)
        if (table->header_item)
                e_table_header_item_customize_view (E_TABLE_HEADER_ITEM (table->header_item));
 }
+
+static void
+table_size_allocate (GtkWidget *widget,
+                    GtkAllocation *alloc,
+                    ETable *table)
+{
+       gdouble width;
+
+       g_return_if_fail (E_IS_TABLE (table));
+       g_return_if_fail (table->priv->info_text != NULL);
+
+       gnome_canvas_get_scroll_region (
+               GNOME_CANVAS (table->table_canvas),
+               NULL, NULL, &width, NULL);
+
+       width -= 60.0;
+
+       g_object_set (table->priv->info_text,
+               "width", width,
+               "clip_width", width,
+               NULL);
+}
+
+/**
+ * e_table_set_info_message:
+ * @table: #ETable instance
+ * @info_message: Message to set. Can be NULL.
+ *
+ * Creates an info message in table area, or removes old.
+ **/
+void
+e_table_set_info_message (ETable *table,
+                         const gchar *info_message)
+{
+       GtkAllocation allocation;
+       GtkWidget *widget;
+
+       g_return_if_fail (E_IS_TABLE (table));
+
+       if (!table->priv->info_text && (!info_message || !*info_message))
+               return;
+
+       if (!info_message || !*info_message) {
+               g_signal_handler_disconnect (table, table->priv->info_text_resize_id);
+               g_object_run_dispose (G_OBJECT (table->priv->info_text));
+               table->priv->info_text = NULL;
+               return;
+       }
+
+       widget = GTK_WIDGET (table->table_canvas);
+       gtk_widget_get_allocation (widget, &allocation);
+
+       if (!table->priv->info_text) {
+               if (allocation.width > 60) {
+                       table->priv->info_text = gnome_canvas_item_new (
+                               GNOME_CANVAS_GROUP (gnome_canvas_root (table->table_canvas)),
+                               e_text_get_type (),
+                               "line_wrap", TRUE,
+                               "clip", TRUE,
+                               "justification", GTK_JUSTIFY_LEFT,
+                               "text", info_message,
+                               "width", (gdouble) allocation.width - 60.0,
+                               "clip_width", (gdouble) allocation.width - 60.0,
+                               NULL);
+
+                       e_canvas_item_move_absolute (table->priv->info_text, 30, 30);
+
+                       table->priv->info_text_resize_id = g_signal_connect_object (
+                               table, "size_allocate",
+                               G_CALLBACK (table_size_allocate), table, 0);
+               }
+       } else
+               gnome_canvas_item_set (table->priv->info_text, "text", info_message, NULL);
+}
diff --git a/src/e-util/e-table.h b/src/e-util/e-table.h
index 5cdc229075..3deb4b3b31 100644
--- a/src/e-util/e-table.h
+++ b/src/e-util/e-table.h
@@ -66,6 +66,7 @@
 G_BEGIN_DECLS
 
 typedef struct _ETable ETable;
+typedef struct _ETablePrivate ETablePrivate;
 typedef struct _ETableClass ETableClass;
 
 typedef struct _ETableDragSourceSite ETableDragSourceSite;
@@ -79,6 +80,8 @@ typedef enum {
 struct _ETable {
        GtkTable parent;
 
+       ETablePrivate *priv;
+
        ETableModel *model;
 
        ETableHeader *full_header, *header;
@@ -379,6 +382,8 @@ void                e_table_freeze_state_change     (ETable *table);
 void           e_table_thaw_state_change       (ETable *table);
 gboolean       e_table_is_editing              (ETable *table);
 void           e_table_customize_view          (ETable *table);
+void           e_table_set_info_message        (ETable *table,
+                                                const gchar *info_message);
 
 G_END_DECLS