GTK: add some support for input methods.

We do not currently support pre-edit texts, or
retrieving/modifying text surrounding the caret.
This does, at least, finally allow the use of
dead keys during text input, but probably is
insufficient for useful input of CJKV &c.

3 files changed, 109 insertions, 19 deletions

diff --git a/gtk/treeview.c b/gtk/treeview.c
index 2a4732a87..c99e9fd43 100644
--- a/gtk/treeview.c
+++ b/gtk/treeview.c
@@ -35,12 +35,14 @@
 #include "gtk/plotters.h"
 #include "gtk/treeview.h"
 #include "utils/log.h"
+#include "utils/utf8.h"
 #include "utils/utils.h"
 
 struct nsgtk_treeview {
 	GtkWindow *window;
 	GtkScrolledWindow *scrolled;
 	GtkDrawingArea *drawing_area;
+	GtkIMContext *input_method;
 	bool mouse_pressed;
 	int mouse_pressed_x;
 	int mouse_pressed_y;
@@ -52,6 +54,7 @@ struct nsgtk_treeview {
 void nsgtk_treeview_destroy(struct nsgtk_treeview *tv)
 {
 	tree_delete(tv->tree);
+	g_object_unref(tv->input_method);
 	gtk_widget_destroy(GTK_WIDGET(tv->window));
 	free(tv);
 }
@@ -206,12 +209,14 @@ void nsgtk_tree_window_hide(GtkWidget *widget, gpointer g)
 {
 }
 
-gboolean nsgtk_tree_window_button_press_event(GtkWidget *widget,
+static gboolean
+nsgtk_tree_window_button_press_event(GtkWidget *widget,
 		GdkEventButton *event, gpointer g)
 {	
 	struct nsgtk_treeview *tw = g;
 	struct tree *tree = tw->tree;
 	
+	gtk_im_context_reset(tw->input_method);
 	gtk_widget_grab_focus(GTK_WIDGET(tw->drawing_area));
 
 	tw->mouse_pressed = true;	
@@ -243,7 +248,8 @@ gboolean nsgtk_tree_window_button_press_event(GtkWidget *widget,
 	return TRUE;
 }
 
-gboolean nsgtk_tree_window_button_release_event(GtkWidget *widget,
+static gboolean
+nsgtk_tree_window_button_release_event(GtkWidget *widget,
 		GdkEventButton *event, gpointer g)
 {
 	bool shift = event->state & GDK_SHIFT_MASK;
@@ -307,7 +313,8 @@ gboolean nsgtk_tree_window_button_release_event(GtkWidget *widget,
 	return TRUE;	
 }
 
-gboolean nsgtk_tree_window_motion_notify_event(GtkWidget *widget,
+static gboolean
+nsgtk_tree_window_motion_notify_event(GtkWidget *widget,
 		GdkEventMotion *event, gpointer g)
 {
 	bool shift = event->state & GDK_SHIFT_MASK;
@@ -369,7 +376,8 @@ gboolean nsgtk_tree_window_motion_notify_event(GtkWidget *widget,
 }
 
 
-gboolean nsgtk_tree_window_keypress_event(GtkWidget *widget, GdkEventKey *event,
+static gboolean
+nsgtk_tree_window_keypress_event(GtkWidget *widget, GdkEventKey *event,
 		gpointer g)
 {
 	struct nsgtk_treeview *tw = (struct nsgtk_treeview *) g;
@@ -381,6 +389,9 @@ gboolean nsgtk_tree_window_keypress_event(GtkWidget *widget, GdkEventKey *event,
 	GtkAdjustment *scroll = NULL;
 	gdouble hpage, vpage;
 	
+	if (gtk_im_context_filter_keypress(tw->input_method, event))
+		return TRUE;
+
 	nskey = gtk_gui_gdkkey_to_nskey(event);
 
 	if (tree_keypress(tree, nskey) == true)
@@ -473,6 +484,32 @@ gboolean nsgtk_tree_window_keypress_event(GtkWidget *widget, GdkEventKey *event,
 	return TRUE;
 }	
 
+static gboolean
+nsgtk_tree_window_keyrelease_event(GtkWidget *widget, GdkEventKey *event,
+		gpointer g)
+{
+	struct nsgtk_treeview *tw = (struct nsgtk_treeview *) g;
+	
+	return gtk_im_context_filter_keypress(tw->input_method, event);
+}
+
+static void
+nsgtk_tree_window_input_method_commit(GtkIMContext *ctx,
+		const gchar *str, gpointer data)
+{
+	struct nsgtk_treeview *tw = (struct nsgtk_treeview *) data;
+	size_t len = strlen(str), offset = 0;
+
+	while (offset < len) {
+		uint32_t nskey = utf8_to_ucs4(str + offset, len - offset);
+
+		tree_keypress(tw->tree, nskey);
+
+		offset = utf8_next(str, len, offset);
+	}
+}
+
+
 static const struct treeview_table nsgtk_tree_callbacks = {
 	.redraw_request = nsgtk_tree_redraw_request,
 	.resized = nsgtk_tree_resized,
@@ -498,6 +535,7 @@ struct nsgtk_treeview *nsgtk_treeview_create(unsigned int flags,
 	tv->window = window;
 	tv->scrolled = scrolled;
 	tv->drawing_area = drawing_area;
+	tv->input_method = gtk_im_multicontext_new();
 	tv->tree = tree_create(flags, &nsgtk_tree_callbacks, tv);
 	tv->mouse_state = 0;
 	tv->mouse_pressed = false;
@@ -510,17 +548,31 @@ struct nsgtk_treeview *nsgtk_treeview_create(unsigned int flags,
 	
 #define CONNECT(obj, sig, callback, ptr) \
 	g_signal_connect(G_OBJECT(obj), (sig), G_CALLBACK(callback), (ptr))
-	CONNECT(drawing_area, "button_press_event",
+	CONNECT(drawing_area, "button-press-event",
 			nsgtk_tree_window_button_press_event,
 			tv);
-	CONNECT(drawing_area, "button_release_event",
+	CONNECT(drawing_area, "button-release-event",
 			nsgtk_tree_window_button_release_event,
   			tv);
-	CONNECT(drawing_area, "motion_notify_event",
+	CONNECT(drawing_area, "motion-notify-event",
 			nsgtk_tree_window_motion_notify_event,
   			tv);
-	CONNECT(drawing_area, "key_press_event",
+	CONNECT(drawing_area, "key-press-event",
 			nsgtk_tree_window_keypress_event,
   			tv);
+	CONNECT(drawing_area, "key-release-event",
+			nsgtk_tree_window_keyrelease_event,
+			tv);
+
+
+	/* input method */
+	gtk_im_context_set_client_window(tv->input_method,
+			nsgtk_widget_get_window(GTK_WIDGET(tv->window)));
+	gtk_im_context_set_use_preedit(tv->input_method, FALSE);
+	/* input method signals */
+	CONNECT(tv->input_method, "commit",
+			nsgtk_tree_window_input_method_commit,
+			tv);
+
 	return tv;
 }
diff --git a/gtk/treeview.h b/gtk/treeview.h
index a0acbd49c..ad8180f33 100644
--- a/gtk/treeview.h
+++ b/gtk/treeview.h
@@ -33,16 +33,6 @@ void nsgtk_treeview_destroy(struct nsgtk_treeview *tv);
 
 struct tree *nsgtk_treeview_get_tree(struct nsgtk_treeview *tv);
 
-gboolean nsgtk_tree_window_expose_event(GtkWidget *, GdkEventExpose *,
-		gpointer g);
 void nsgtk_tree_window_hide(GtkWidget *widget, gpointer g);
-gboolean nsgtk_tree_window_button_press_event(GtkWidget *widget,
-		GdkEventButton *event, gpointer g);
-gboolean nsgtk_tree_window_button_release_event(GtkWidget *widget,
-		GdkEventButton *event, gpointer g);
-gboolean nsgtk_tree_window_motion_notify_event(GtkWidget *widget,
-		GdkEventMotion *event, gpointer g);
-gboolean nsgtk_tree_window_keypress_event(GtkWidget *widget, GdkEventKey *event,
-		gpointer g);
 
 #endif /*__NSGTK_TREEVIEW_H__*/
diff --git a/gtk/window.c b/gtk/window.c
index 038622d19..2da346b33 100644
--- a/gtk/window.c
+++ b/gtk/window.c
@@ -27,6 +27,7 @@
 #include <gdk-pixbuf/gdk-pixdata.h>
 
 #include "utils/log.h"
+#include "utils/utf8.h"
 #include "utils/utils.h"
 #include "utils/nsoption.h"
 #include "content/hlcache.h"
@@ -105,6 +106,9 @@ struct gui_window {
 	/** The icon this window should have */
 	GdkPixbuf *icon;
 
+	/** The input method to use with this window */
+	GtkIMContext *input_method;
+
 	/** list for cleanup */
 	struct gui_window *next, *prev;
 };
@@ -315,6 +319,7 @@ static gboolean nsgtk_window_button_press_event(GtkWidget *widget,
 {
 	struct gui_window *g = data;
 
+	gtk_im_context_reset(g->input_method);
 	gtk_widget_grab_focus(GTK_WIDGET(g->layout));
 	gtk_widget_hide(GTK_WIDGET(nsgtk_scaffolding_history_window(
 			g->scaffold)->window));
@@ -490,7 +495,12 @@ static gboolean nsgtk_window_keypress_event(GtkWidget *widget,
 				GdkEventKey *event, gpointer data)
 {
 	struct gui_window *g = data;
-	uint32_t nskey = gtk_gui_gdkkey_to_nskey(event);
+	uint32_t nskey;
+	
+	if (gtk_im_context_filter_keypress(g->input_method, event))
+		return TRUE;
+
+	nskey = gtk_gui_gdkkey_to_nskey(event);
 
 	if (browser_window_key_press(g->bw, nskey))
 		return TRUE;
@@ -598,6 +608,31 @@ static gboolean nsgtk_window_keypress_event(GtkWidget *widget,
 	return TRUE;
 }
 
+static gboolean nsgtk_window_keyrelease_event(GtkWidget *widget,
+				GdkEventKey *event, gpointer data)
+{
+	struct gui_window *g = data;
+	
+	return gtk_im_context_filter_keypress(g->input_method, event);
+}
+
+
+static void nsgtk_window_input_method_commit(GtkIMContext *ctx,
+				const gchar *str, gpointer data)
+{
+	struct gui_window *g = data;
+	size_t len = strlen(str), offset = 0;
+
+	while (offset < len) {
+		uint32_t nskey = utf8_to_ucs4(str + offset, len - offset);
+
+		browser_window_key_press(g->bw, nskey);
+
+		offset = utf8_next(str, len, offset);
+	}
+}
+
+
 static gboolean nsgtk_window_size_allocate_event(GtkWidget *widget,
 		GtkAllocation *allocation, gpointer data)
 {
@@ -658,6 +693,8 @@ static void window_destroy(GtkWidget *widget, gpointer data)
 	struct gui_window *gw = data;
 
 	browser_window_destroy(gw->bw);
+
+	g_object_unref(gw->input_method);
 }
 
 /* Core interface documented in desktop/gui.h to create a gui_window */
@@ -720,6 +757,7 @@ gui_window_create(struct browser_window *bw,
 	g->layout = GTK_LAYOUT(gtk_builder_get_object(xml, "layout"));
 	g->status_bar = GTK_LABEL(gtk_builder_get_object(xml, "status_bar"));
 	g->paned = GTK_PANED(gtk_builder_get_object(xml, "hpaned1"));
+	g->input_method = gtk_im_multicontext_new();
 
 
 	/* add new gui window to global list (push_top) */
@@ -763,6 +801,8 @@ gui_window_create(struct browser_window *bw,
 			nsgtk_window_button_release_event, g);
 	CONNECT(g->layout, "key-press-event",
 			nsgtk_window_keypress_event, g);
+	CONNECT(g->layout, "key-release-event",
+			nsgtk_window_keyrelease_event, g);
 	CONNECT(g->layout, "size-allocate",
 			nsgtk_window_size_allocate_event, g);
 	CONNECT(g->layout, "scroll-event",
@@ -779,6 +819,14 @@ gui_window_create(struct browser_window *bw,
 	CONNECT(g->container, "destroy",
 		window_destroy, g);
 
+	/* input method */
+	gtk_im_context_set_client_window(g->input_method,
+			nsgtk_layout_get_bin_window(g->layout));
+	gtk_im_context_set_use_preedit(g->input_method, FALSE);
+	/* input method signals */
+	CONNECT(g->input_method, "commit",
+		nsgtk_window_input_method_commit, g);
+
 	/* add the tab container to the scaffold notebook */
 	switch (temp_open_background) {
 	case -1: