[PATCH weston 06/11] keyboard: Only set toplevel when there is a valid output

[Armin Krezović]

Currently, the keyboard client is created and the input
panel surface is set as toplevel on the first output it
finds. This does not work in a scenario when there are
no outputs, resulting in weston-keyboard to crash at
startup due to operating on an invalid output pointer.

This makes input panel toplevel setting depend on a
valid output, and if there was no output present at
startup, it will be set toplevel as soon as an output
gets plugged in.

Signed-off-by: Armin Krezović <krezovic.armin at gmail.com>
---
 clients/keyboard.c | 33 +++++++++++++++++++++++++++------
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/clients/keyboard.c b/clients/keyboard.c
index d719764..4fb4200 100644
--- a/clients/keyboard.c
+++ b/clients/keyboard.c
@@ -24,6 +24,7 @@
 
 #include "config.h"
 
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -56,6 +57,7 @@ struct virtual_keyboard {
 	char *surrounding_text;
 	uint32_t surrounding_cursor;
 	struct keyboard *keyboard;
+	bool toplevel;
 };
 
 enum key_type {
@@ -953,11 +955,26 @@ global_handler(struct display *display, uint32_t name,
 }
 
 static void
+set_toplevel(struct output *output, struct virtual_keyboard *virtual_keyboard)
+{
+	struct zwp_input_panel_surface_v1 *ips;
+	struct keyboard *keyboard = virtual_keyboard->keyboard;
+
+	ips = zwp_input_panel_v1_get_input_panel_surface(virtual_keyboard->input_panel,
+							 window_get_wl_surface(keyboard->window));
+
+	zwp_input_panel_surface_v1_set_toplevel(ips,
+						output_get_wl_output(output),
+						ZWP_INPUT_PANEL_SURFACE_V1_POSITION_CENTER_BOTTOM);
+
+	virtual_keyboard->toplevel = true;
+}
+
+static void
 keyboard_create(struct output *output, struct virtual_keyboard *virtual_keyboard)
 {
 	struct keyboard *keyboard;
 	const struct layout *layout;
-	struct zwp_input_panel_surface_v1 *ips;
 
 	layout = get_current_layout(virtual_keyboard);
 
@@ -981,13 +998,16 @@ keyboard_create(struct output *output, struct virtual_keyboard *virtual_keyboard
 			       layout->columns * key_width,
 			       layout->rows * key_height);
 
+	if (output)
+		set_toplevel(output, virtual_keyboard);
+}
 
-	ips = zwp_input_panel_v1_get_input_panel_surface(virtual_keyboard->input_panel,
-							 window_get_wl_surface(keyboard->window));
+static
+void display_output_handler(struct output *output, void *data) {
+	struct virtual_keyboard *keyboard = data;
 
-	zwp_input_panel_surface_v1_set_toplevel(ips,
-						output_get_wl_output(output),
-						ZWP_INPUT_PANEL_SURFACE_V1_POSITION_CENTER_BOTTOM);
+	if (!keyboard->toplevel)
+		set_toplevel(output, keyboard);
 }
 
 int
@@ -1006,6 +1026,7 @@ main(int argc, char *argv[])
 
 	display_set_user_data(virtual_keyboard.display, &virtual_keyboard);
 	display_set_global_handler(virtual_keyboard.display, global_handler);
+	display_set_output_configure_handler(virtual_keyboard.display, display_output_handler);
 
 	if (virtual_keyboard.input_panel == NULL) {
 		fprintf(stderr, "No input panel global\n");
-- 
2.9.0