From: Ning Tang <ning.t...@intel.com>

We could know how many layouts in total and our current layout.
Keyword in ini file is the path to indicator images, use the format of
1-f.png(focus) 1.png 2-f.png...

 Signed-off-by: Ning Tang <tecto...@gmail.com>

---
 clients/tablet-shell.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++
 weston-tablet.ini      |  1 +
 2 files changed, 52 insertions(+)

diff --git a/clients/tablet-shell.c b/clients/tablet-shell.c
index 860bba8..abf0e7c 100644
--- a/clients/tablet-shell.c
+++ b/clients/tablet-shell.c
@@ -63,6 +63,7 @@ struct layout {
        struct wl_list launcher_list;
        struct wl_list link;
        int index;
+       int active;
        int pressed;
        int showing;
        int offset;
@@ -74,6 +75,8 @@ struct layout {
        int switching;                  /* 0-no 1-right -1-left*/
        int s_speed;                    /* switching speed */
        struct wl_list *layout_list;    /* we need know the number of list */
+       cairo_surface_t *active_indicator;
+       cairo_surface_t *inactive_indicator;
 };
 
 struct launcher {
@@ -103,6 +106,7 @@ static char *key_launcher_icon;
 static char *key_launcher_path;
 static void launcher_section_done(void *data);
 static void layout_section_done(void *data);
+static char *key_layout_indicator_path;
 static char *key_trash_image;
 /* launcher drag */
 struct launcher *gl_launcher_drag = NULL;
@@ -119,6 +123,7 @@ static const struct config_key shell_config_keys[] = {
        { "lockscreen", CONFIG_KEY_STRING, &key_lockscreen_background },
        { "homescreen", CONFIG_KEY_STRING, &key_homescreen_background },
        { "trash-image", CONFIG_KEY_STRING, &key_trash_image },
+       { "layout-indicator", CONFIG_KEY_STRING, &key_layout_indicator_path },
        { "layout-rows", CONFIG_KEY_UNSIGNED_INTEGER, &key_layout_rows },
        { "layout-columns", CONFIG_KEY_UNSIGNED_INTEGER, &key_layout_columns },
        { "icon-size", CONFIG_KEY_UNSIGNED_INTEGER, &launcher_size },
@@ -224,6 +229,31 @@ homescreen_draw_trash(void *data, int x, int y)
 }
 
 static void
+layout_draw_indicator(struct layout *layout, int y, int x_center)
+{
+       const int index_size = 40;
+       int total_layout = wl_list_length(layout->layout_list) - 1;
+       int current_index = layout->index;
+       int odd = (total_layout % 2 == 0)? 1: 0;
+       int offset = current_index - (total_layout / 2) - (odd ? 0: 1);
+       int x;
+       cairo_surface_t *surface;
+       surface = window_get_surface(layout->homescreen->window);
+       cairo_t *cr = cairo_create(surface);
+
+       x = x_center + (offset * index_size) - (odd? index_size / 2: 0);
+       if (layout->active) {
+               cairo_set_source_surface(cr, layout->active_indicator, x, y);
+       } else {
+               cairo_set_source_surface(cr, layout->inactive_indicator, x, y);
+       }
+       cairo_paint(cr);
+       
+       cairo_destroy(cr);
+       cairo_surface_destroy(surface);
+}
+
+static void
 homescreen_draw(struct widget *widget, void *data)
 {
        struct homescreen *homescreen = data;
@@ -249,6 +279,9 @@ homescreen_draw(struct widget *widget, void *data)
                                              allocation.height
                                              - 2 * layout->vmargin);
                }
+               layout_draw_indicator(layout,
+                                     allocation.height - layout->vmargin,
+                                     allocation.width / 2);
        }
 
        /* draw trash if dragging*/
@@ -785,7 +818,9 @@ layout_frame_callback(void *data, struct wl_callback 
*callback, uint32_t time)
                        layout->showing = 0;
                        widget_set_allocation(layout->widget,
                                              0, 0, 0, 0);
+                       layout->active = 0;
                } else {
+                       layout->active = 1;
                        widget_set_allocation(layout->widget,
                                              layout->hmargin,
                                              layout->vmargin,
@@ -1027,6 +1062,7 @@ tablet_shell_add_layout(struct tablet *tablet)
        struct layout *layout;
        struct homescreen *homescreen = tablet->homescreen;
        struct rectangle allocation;
+       char *index_image;
        widget_get_allocation(homescreen->widget, &allocation);
 
        layout = malloc(sizeof *layout);
@@ -1039,6 +1075,7 @@ tablet_shell_add_layout(struct tablet *tablet)
        layout->switching = 0;
        layout->s_speed = 30;
        if (wl_list_empty(&homescreen->layout_list)) {
+               layout->active = 1;
                layout->showing = 1;
        }
        layout->offset = 0;
@@ -1048,6 +1085,20 @@ tablet_shell_add_layout(struct tablet *tablet)
        layout->index = wl_list_length(layout->layout_list);
 
        wl_list_insert(homescreen->layout_list.prev, &layout->link);
+       if (layout->inactive_indicator == NULL && key_layout_indicator_path) {
+               index_image = malloc(sizeof (char) *
+                             (strlen(key_layout_indicator_path) + 7));
+               memset(index_image, 0, sizeof *index_image);
+               sprintf(index_image, "%s%d%s",
+                       key_layout_indicator_path, layout->index + 1, ".png");
+               layout->inactive_indicator =
+                       load_cairo_surface(index_image);
+               sprintf(index_image, "%s%d%s",
+                       key_layout_indicator_path, layout->index + 1, "-f.png");
+               layout->active_indicator =
+                       load_cairo_surface(index_image);
+               free(index_image);
+       }
        widget_set_button_handler(layout->widget,
                                  layout_button_handler);
        widget_set_motion_handler(layout->widget,
diff --git a/weston-tablet.ini b/weston-tablet.ini
index 58fd688..f1f12ad 100644
--- a/weston-tablet.ini
+++ b/weston-tablet.ini
@@ -8,6 +8,7 @@ layout-rows=6
 layout-columns=8
 icon-size=64
 trash-image=/usr/share/weston/trash.png
+layout-indicator=/usr/share/weston/
 
 [layout]
 [launcher]
-- 
1.7.11.5

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