text: Add reset requets to protocol

Add a reset request to the text_model interface and a reset event to the
input_method_context interface. Use it to reset the pre-edit buffers in
the example keyboard when the cursor is moved in the example editor
client.

Signed-off-by: Jan Arne Petersen <jpetersen@openismus.com>

clients/editor.c

@@ -548,6 +548,8 @@ text_entry_set_cursor_position(struct text_entry *entry,
 {
 	entry->cursor = text_layout_xy_to_index(entry->layout, x, y);
 
+	text_model_reset(entry->model);
+
 	if (entry->cursor >= entry->preedit_cursor) {
 		entry->cursor -= entry->preedit_cursor;
 	}

clients/keyboard.c

@@ -303,8 +303,26 @@ input_method_context_surrounding_text(void *data,
 	fprintf(stderr, "Surrounding text updated: %s\n", text);
 }
 
+static void
+input_method_context_reset(void *data,
+			   struct input_method_context *context)
+{
+	struct virtual_keyboard *keyboard = data;
+
+	fprintf(stderr, "Reset pre-edit buffer\n");
+
+	if (strlen(keyboard->preedit_string)) {
+		input_method_context_preedit_string(context,
+						    "",
+						    0);
+		free(keyboard->preedit_string);
+		keyboard->preedit_string = strdup("");
+	}
+}
+
 static const struct input_method_context_listener input_method_context_listener = {
 	input_method_context_surrounding_text,
+	input_method_context_reset
 };
 
 static void

protocol/input-method.xml

@@ -68,6 +68,8 @@
       <arg name="cursor" type="uint"/>
       <arg name="anchor" type="uint"/>
     </event>
+    <event name="reset">
+    </event>
   </interface>
 
   <interface name="input_method" version="1">

protocol/text.xml

@@ -67,6 +67,8 @@
       </description>
       <arg name="seat" type="object" interface="wl_seat"/>
     </request>
+    <request name="reset">
+    </request>
     <request name="set_micro_focus">
       <arg name="x" type="int"/>
       <arg name="y" type="int"/>

src/text-backend.c

@@ -172,6 +172,20 @@ text_model_deactivate(struct wl_client *client,
 			      weston_seat->input_method);
 }
 
+static void
+text_model_reset(struct wl_client *client,
+		 struct wl_resource *resource)
+{
+	struct text_model *text_model = resource->data;
+	struct input_method *input_method, *next;
+
+	wl_list_for_each_safe(input_method, next, &text_model->input_methods, link) {
+		if (!input_method->context)
+			continue;
+		input_method_context_send_reset(&input_method->context->resource);
+	}
+}
+
 static void
 text_model_set_micro_focus(struct wl_client *client,
 			   struct wl_resource *resource,
@@ -198,6 +212,7 @@ static const struct text_model_interface text_model_implementation = {
 	text_model_set_surrounding_text,
 	text_model_activate,
 	text_model_deactivate,
+	text_model_reset,
 	text_model_set_micro_focus,
 	text_model_set_preedit,
 	text_model_set_content_type