1)
Width and height of Panel and Background depend on output's, therefore
they should be bound with output changes including mode, transform and
scale.

2)
Update the min_allocation before resize the panel and background
window. Add window_set_min_allocation function because it is invisible
outside window.c.

Signed-off-by: Quanxian Wang <[email protected]>
---
 clients/desktop-shell.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++--
 clients/window.c        |  7 +++++
 clients/window.h        |  2 ++
 3 files changed, 81 insertions(+), 3 deletions(-)

diff --git a/clients/desktop-shell.c b/clients/desktop-shell.c
index a0c6b6d..dc98ea1 100644
--- a/clients/desktop-shell.c
+++ b/clients/desktop-shell.c
@@ -103,6 +103,15 @@ struct output {
 
        struct panel *panel;
        struct background *background;
+       struct {
+               int height;
+               int width;
+               uint32_t refresh;
+       } mode;
+
+       uint32_t interface_version;
+       uint32_t transform;
+       uint32_t scale;
 };
 
 struct panel_launcher {
@@ -1145,6 +1154,39 @@ desktop_destroy_outputs(struct desktop *desktop)
 }
 
 static void
+update_output(struct output *output)
+{
+       struct panel *panel = output->panel;
+       struct background *background = output->background;
+       int width, height;
+
+       width = output->mode.width;
+       height = output->mode.height;
+
+       switch (output->transform) {
+       case WL_OUTPUT_TRANSFORM_90:
+       case WL_OUTPUT_TRANSFORM_270:
+       case WL_OUTPUT_TRANSFORM_FLIPPED_90:
+       case WL_OUTPUT_TRANSFORM_FLIPPED_270:
+               /* Swap width and height */
+               width = output->mode.height;
+               height = output->mode.width;
+               break;
+       default:
+               break;
+       }
+
+       width /= output->scale;
+       height /= output->scale;
+
+       window_set_min_allocation(panel->window, width, 32);
+       window_set_min_allocation(background->window, width, height);
+
+       window_schedule_resize(background->window, width, height);
+       window_schedule_resize(panel->window, width, 32);
+}
+
+static void
 output_handle_geometry(void *data,
                        struct wl_output *wl_output,
                        int x, int y,
@@ -1157,6 +1199,11 @@ output_handle_geometry(void *data,
 {
        struct output *output = data;
 
+       output->transform = transform;
+
+       if (output->interface_version < 2)
+               update_output(output);
+
        window_set_buffer_transform(output->panel->window, transform);
        window_set_buffer_transform(output->background->window, transform);
 }
@@ -1169,12 +1216,28 @@ output_handle_mode(void *data,
                   int height,
                   int refresh)
 {
+       struct output *output = data;
+
+       if (flags & WL_OUTPUT_MODE_CURRENT) {
+               if (!output)
+                       return;
+
+               output->mode.width = width;
+               output->mode.height = height;
+               output->mode.refresh = refresh;
+
+               if (output->interface_version < 2)
+                       update_output(output);
+       }
 }
 
 static void
 output_handle_done(void *data,
                    struct wl_output *wl_output)
 {
+       struct output *output = data;
+
+       update_output(output);
 }
 
 static void
@@ -1184,6 +1247,8 @@ output_handle_scale(void *data,
 {
        struct output *output = data;
 
+       output->scale  = scale;
+
        window_set_buffer_scale(output->panel->window, scale);
        window_set_buffer_scale(output->background->window, scale);
 }
@@ -1212,7 +1277,7 @@ output_init(struct output *output, struct desktop 
*desktop)
 }
 
 static void
-create_output(struct desktop *desktop, uint32_t id)
+create_output(struct desktop *desktop, uint32_t id, uint32_t version)
 {
        struct output *output;
 
@@ -1220,9 +1285,13 @@ create_output(struct desktop *desktop, uint32_t id)
        if (!output)
                return;
 
+       output->interface_version = (version < 2) ? version : 2;
        output->output =
-               display_bind(desktop->display, id, &wl_output_interface, 2);
+               display_bind(desktop->display, id,
+                            &wl_output_interface,
+                            output->interface_version);
        output->server_output_id = id;
+       output->scale = 1;
 
        wl_output_add_listener(output->output, &output_listener, output);
 
@@ -1247,7 +1316,7 @@ global_handler(struct display *display, uint32_t id,
                                              desktop->interface_version);
                desktop_shell_add_listener(desktop->shell, &listener, desktop);
        } else if (!strcmp(interface, "wl_output")) {
-               create_output(desktop, id);
+               create_output(desktop, id, version);
        }
 }
 
diff --git a/clients/window.c b/clients/window.c
index c8287e2..6c01222 100644
--- a/clients/window.c
+++ b/clients/window.c
@@ -3839,6 +3839,13 @@ undo_resize(struct window *window)
 }
 
 void
+window_set_min_allocation(struct window *window, int width, int height)
+{
+       window->min_allocation.width = width;
+       window->min_allocation.height = height;
+}
+
+void
 window_schedule_resize(struct window *window, int width, int height)
 {
        /* We should probably get these numbers from the theme. */
diff --git a/clients/window.h b/clients/window.h
index 54b848b..b221b76 100644
--- a/clients/window.h
+++ b/clients/window.h
@@ -336,6 +336,8 @@ void
 window_schedule_redraw(struct window *window);
 void
 window_schedule_resize(struct window *window, int width, int height);
+void
+window_set_min_allocation(struct window *window, int width, int height);
 
 void
 window_damage(struct window *window, int32_t x, int32_t y,
-- 
1.8.1.2

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