From f67627875ffc723ca1a1e96e3677e387e3395659 Mon Sep 17 00:00:00 2001
From: Dorota Czaplejewicz <dorota.czaplejewicz@puri.sm>
Date: Tue, 16 Oct 2018 16:29:08 +0000
Subject: imwayland: Handle enter and leave events

Before this patch, imwayland would assume that text-input enter and leave events follow the general (wl_keyboard) focus, and was unable to handle the situation where they would not be provided at the same time.
---
 gtk/gtkimcontextwayland.c | 85 +++++++++++++++++++++++++++++++----------------
 1 file changed, 57 insertions(+), 28 deletions(-)

(limited to 'gtk/gtkimcontextwayland.c')

diff --git a/gtk/gtkimcontextwayland.c b/gtk/gtkimcontextwayland.c
index 891d948c8a..6e52c5f0c5 100644
--- a/gtk/gtkimcontextwayland.c
+++ b/gtk/gtkimcontextwayland.c
@@ -42,6 +42,10 @@ struct _GtkIMContextWaylandGlobal
 
   GtkIMContext *current;
 
+  /* The input-method.enter event may happen before or after GTK focus-in,
+   * so the context may not exist at the time. Same for leave and focus-out. */
+  gboolean focused;
+
   guint serial;
 };
 
@@ -100,6 +104,13 @@ static GtkIMContextWaylandGlobal *global = NULL;
 
 #define GTK_IM_CONTEXT_WAYLAND(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), gtk_im_context_wayland_get_type (), GtkIMContextWayland))
 
+
+static void
+enable (GtkIMContextWayland *context_wayland);
+
+static void
+disable (GtkIMContextWayland *context_wayland);
+
 static void
 notify_external_change (GtkIMContextWayland *context)
 {
@@ -116,13 +127,23 @@ static void
 text_input_enter (void                     *data,
                   struct zwp_text_input_v3 *text_input,
                   struct wl_surface        *surface)
-{}
+{
+  global->focused = TRUE;
+
+  if (global->current)
+    enable (GTK_IM_CONTEXT_WAYLAND (global->current));
+}
 
 static void
 text_input_leave (void                     *data,
                   struct zwp_text_input_v3 *text_input,
                   struct wl_surface        *surface)
-{}
+{
+  global->focused = FALSE;
+
+  if (global->current)
+    disable (GTK_IM_CONTEXT_WAYLAND (global->current));
+}
 
 static void
 text_input_preedit (void                     *data,
@@ -455,12 +476,6 @@ commit_state (GtkIMContextWayland *context)
   context->surrounding_change = ZWP_TEXT_INPUT_V3_CHANGE_CAUSE_INPUT_METHOD;
 }
 
-static void
-enable_text_input (GtkIMContextWayland *context)
-{
-  zwp_text_input_v3_enable (global->text_input);
-}
-
 static void
 gtk_im_context_wayland_finalize (GObject *object)
 {
@@ -498,14 +513,15 @@ released_cb (GtkGestureMultiPress *gesture,
 
   g_object_get (context, "input-hints", &hints, NULL);
 
-  if (n_press == 1 &&
+  if (global->focused &&
+      n_press == 1 &&
       (hints & GTK_INPUT_HINT_INHIBIT_OSK) == 0 &&
       !gtk_drag_check_threshold (context->widget,
                                  context->press_x,
                                  context->press_y,
                                  x, y))
     {
-      enable_text_input (GTK_IM_CONTEXT_WAYLAND (context));
+      zwp_text_input_v3_enable (global->text_input);
       g_signal_emit_by_name (global->current, "retrieve-surrounding", &result);
       commit_state (context);
     }
@@ -604,18 +620,10 @@ gtk_im_context_wayland_filter_keypress (GtkIMContext *context,
 }
 
 static void
-gtk_im_context_wayland_focus_in (GtkIMContext *context)
+enable (GtkIMContextWayland *context_wayland)
 {
-  GtkIMContextWayland *context_wayland = GTK_IM_CONTEXT_WAYLAND (context);
   gboolean result;
-
-  if (global->current == context)
-    return;
-  if (!global->text_input)
-    return;
-
-  global->current = context;
-  enable_text_input (context_wayland);
+  zwp_text_input_v3_enable (global->text_input);
   g_signal_emit_by_name (global->current, "retrieve-surrounding", &result);
   notify_content_type (context_wayland);
   notify_cursor_location (context_wayland);
@@ -623,15 +631,8 @@ gtk_im_context_wayland_focus_in (GtkIMContext *context)
 }
 
 static void
-gtk_im_context_wayland_focus_out (GtkIMContext *context)
+disable (GtkIMContextWayland *context_wayland)
 {
-  GtkIMContextWayland *context_wayland;
-
-  if (global->current != context)
-    return;
-
-  context_wayland = GTK_IM_CONTEXT_WAYLAND (context);
-
   zwp_text_input_v3_disable (global->text_input);
   commit_state (context_wayland);
 
@@ -641,6 +642,34 @@ gtk_im_context_wayland_focus_out (GtkIMContext *context)
       text_input_preedit (global, global->text_input, NULL, 0, 0);
       text_input_preedit_apply (global);
     }
+}
+
+static void
+gtk_im_context_wayland_focus_in (GtkIMContext *context)
+{
+  GtkIMContextWayland *context_wayland = GTK_IM_CONTEXT_WAYLAND (context);
+
+  if (global->current == context)
+    return;
+  if (!global->text_input)
+    return;
+
+  global->current = context;
+
+  if (global->focused)
+    enable (context_wayland);
+}
+
+static void
+gtk_im_context_wayland_focus_out (GtkIMContext *context)
+{
+  GtkIMContextWayland *context_wayland = GTK_IM_CONTEXT_WAYLAND (context);
+
+  if (global->current != context)
+    return;
+
+  if (global->focused)
+    disable (context_wayland);
 
   global->current = NULL;
 }
-- 
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