text: Add support for control keys to the protocol

Add key event to the text_model interface and a key request to the
input_method_context interface. Implement it in the example editor
client and the example keyboard.

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

clients/editor.c

@@ -284,8 +284,31 @@ text_model_preedit_styling(void *data,
 
 static void
 text_model_key(void *data,
-	       struct text_model *text_model)
+	       struct text_model *text_model,
+               uint32_t key,
+               uint32_t state)
 {
+	const char *state_label;
+	const char *key_label;
+
+	if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
+		state_label = "pressed";
+	} else {
+		state_label = "released";
+	}
+
+	switch (key) {
+		case XKB_KEY_Tab:
+			key_label = "Tab";
+			break;
+		case XKB_KEY_KP_Enter:
+			key_label = "Enter";
+			break;
+		default:
+			key_label = "Unknown";
+	}
+
+	fprintf(stderr, "%s key was %s.\n", key_label, state_label);
 }
 
 static void

clients/keyboard.c

@@ -228,6 +228,8 @@ keyboard_handle_key(struct keyboard *keyboard, const struct key *key)
 			}
 			break;
 		case keytype_enter:
+			input_method_context_key(keyboard->keyboard->context,
+						 XKB_KEY_KP_Enter, WL_KEYBOARD_KEY_STATE_PRESSED);
 			break;
 		case keytype_space:
 			keyboard->keyboard->preedit_string = strcat(keyboard->keyboard->preedit_string,
@@ -250,6 +252,8 @@ keyboard_handle_key(struct keyboard *keyboard, const struct key *key)
 		case keytype_symbols:
 			break;
 		case keytype_tab:
+			input_method_context_key(keyboard->keyboard->context,
+						 XKB_KEY_Tab, WL_KEYBOARD_KEY_STATE_PRESSED);
 			break;
 	}
 }

protocol/input-method.xml

@@ -53,6 +53,10 @@
       <arg name="index" type="int"/>
       <arg name="length" type="uint"/>
     </request>
+    <request name="key">
+      <arg name="key" type="uint"/>
+      <arg name="state" type="uint"/>
+    </request>
     <event name="surrounding_text">
       <description summary="surrounding text event">
         The plain surrounding text around the input position. Cursor is the

protocol/text.xml

@@ -89,7 +89,10 @@
       <arg name="length" type="uint"/>
     </event>
     <event name="preedit_styling"/>
-    <event name="key"/>
+    <event name="key">
+      <arg name="key" type="uint"/>
+      <arg name="state" type="uint"/>
+    </event>
     <event name="selection_replacement"/>
     <event name="direction"/>
     <event name="locale"/>

src/text-backend.c

@@ -316,11 +316,23 @@ input_method_context_delete_surrounding_text(struct wl_client *client,
 	text_model_send_delete_surrounding_text(&context->model->resource, index, length);
 }
 
+static void
+input_method_context_key(struct wl_client *client,
+			 struct wl_resource *resource,
+			 uint32_t key,
+			 uint32_t state)
+{
+	struct input_method_context *context = resource->data;
+
+	text_model_send_key(&context->model->resource, key, state);
+}
+
 static const struct input_method_context_interface input_method_context_implementation = {
 	input_method_context_destroy,
 	input_method_context_commit_string,
 	input_method_context_preedit_string,
-	input_method_context_delete_surrounding_text
+	input_method_context_delete_surrounding_text,
+	input_method_context_key
 };
 
 static void

tests/test-text-client.c

@@ -75,7 +75,9 @@ text_model_preedit_styling(void *data,
 
 static void 
 text_model_key(void *data,
-	       struct text_model *text_model)
+	       struct text_model *text_model,
+	       uint32_t key,
+	       uint32_t state)
 {
 }