Added basic linkdrag

gnoemoe/widgets/gm-world-text-view.c

@@ -1,6 +1,6 @@
 #include <gtk/gtk.h>
 #include <string.h>
-
+#include <gdk/gdk.h>
 #include "gm-world-text-view.h"
 #include "../gm-color-table.h"
 #include "../gm-marshal.h"
@@ -24,11 +24,15 @@ void on_gm_world_text_view_color_table_font_changed(GmColorTable *table,
 		gchar *font_description, GmWorldTextView *view);
 void on_gm_world_text_view_populate_popup(GmWorldTextView *view, GtkMenu *menu, 
 		gpointer user_data);
+void on_gm_world_text_view_drag_data_get(GmWorldTextView *view, 
+		GdkDragContext *context, GtkSelectionData *data, guint info, 
+		guint time, gpointer user_data);
 
 void gm_world_text_view_create_tags(GmWorldTextView *view);
 void gm_world_text_view_init_tags(GmWorldTextView *view);
 void gm_world_text_view_update_font(GmWorldTextView *view);
 
+
 #define GM_WORLD_TEXT_VIEW_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE((object), GM_TYPE_WORLD_TEXT_VIEW, GmWorldTextViewPrivate))
 #define GM_WORLD_TEXT_VIEW_BUFFER(view) gtk_text_view_get_buffer(GTK_TEXT_VIEW(view))
 
@@ -49,6 +53,11 @@ struct _GmWorldTextViewPrivate {
 	gint max_lines;
 	GmWorldTextViewInsertInfo last_info;
 	GmColorTable *color_table;
+	gboolean drag_url;
+	gchar *drag_url_text;
+	guint drag_x;
+	guint drag_y;
+	GtkTargetList *source_target_list;
 };
 
 /* Signals */
@@ -72,6 +81,7 @@ gm_world_text_view_finalize(GObject *object) {
 	g_list_free(view->priv->last_info.tags);
 	g_free(view->priv->last_info.text);
 	
+	gtk_target_list_unref(view->priv->source_target_list);
 	G_OBJECT_CLASS(gm_world_text_view_parent_class)->finalize(object);
 }
 
@@ -107,6 +117,15 @@ gm_world_text_view_class_init(GmWorldTextViewClass *klass) {
 	g_type_class_add_private(object_class, sizeof(GmWorldTextViewPrivate));
 }
 
+enum {
+	DRAG_URL,
+	NUM_TARGETS
+};
+
+static const GtkTargetEntry drag_targets[] = {
+	{"_NETSCAPE_URL", 0, DRAG_URL}
+};
+
 static void
 gm_world_text_view_init(GmWorldTextView *view) {
 	view->priv = GM_WORLD_TEXT_VIEW_GET_PRIVATE(view);
@@ -138,11 +157,16 @@ gm_world_text_view_init(GmWorldTextView *view) {
 	view->priv->last_info.tags = NULL;
 	view->priv->last_info.text = NULL;
 	
+	view->priv->source_target_list = gtk_target_list_new(drag_targets, 
+			NUM_TARGETS);
+	
 	// Connect style set signal
 	g_signal_connect(view, "style-set", 
 			G_CALLBACK(on_gm_world_text_view_style_set), NULL);
     g_signal_connect(view, "populate_popup", 
 			G_CALLBACK(on_gm_world_text_view_populate_popup), NULL);
+	g_signal_connect(view, "drag_data_get", 
+			G_CALLBACK(on_gm_world_text_view_drag_data_get), NULL);
 }
 
 /* Private functions */
@@ -527,7 +551,7 @@ gm_world_text_view_tags_overlap(GtkTextTag *t1, GtkTextTag *t2) {
 			return TRUE;
 		}
 		
-		i++;
+		++i;
 	}
 	
 	return FALSE;
@@ -886,13 +910,52 @@ gboolean
 on_gm_world_text_view_url_event(GtkTextTag *tag, GObject *object, 
 		GdkEvent *event, GtkTextIter *iter,	GmWorldTextView *view) {
 	GtkTextIter start, end;
-	gchar *str;
+	gchar *str = NULL;
 	GtkTextBuffer *buffer = GM_WORLD_TEXT_VIEW_BUFFER(view);
+
+	start = end = *iter;
+		
+	if (gtk_text_iter_backward_to_tag_toggle(&start, tag) &&
+			gtk_text_iter_forward_to_tag_toggle(&end, tag)) {
+		str = gtk_text_buffer_get_text(buffer, &start, &end, FALSE);
+	}
 	
+	if (str == NULL) {
+		return FALSE;
+	}
+
+	if (event->type == GDK_MOTION_NOTIFY && view->priv->drag_url && 
+			!(event->motion.state & GDK_CONTROL_MASK) && 
+			gtk_drag_check_threshold(GTK_WIDGET(view), view->priv->drag_x,
+			view->priv->drag_y, event->motion.x, event->motion.y)) {
+		view->priv->drag_url = FALSE;
+		view->priv->drag_url_text = g_strdup(str);
+		gtk_drag_begin(GTK_WIDGET(view), view->priv->source_target_list,
+				GDK_ACTION_COPY | GDK_ACTION_LINK | GDK_ACTION_ASK, 
+				1, event);
+
+		GM_DEBUG("Drag started!");
+	}
+	
+	if (event->type == GDK_BUTTON_PRESS && 
+			!(event->button.state & GDK_CONTROL_MASK)) {
+		GM_DEBUG("Possible drag init!");
+		view->priv->drag_x = event->button.x;
+		view->priv->drag_y = event->button.y;
+		view->priv->drag_url = TRUE;
+	}
+	
+	if (event->type == GDK_BUTTON_RELEASE && view->priv->drag_url &&
+			event->button.button == 1) {
+		GM_DEBUG("Drag stopped!");
+		view->priv->drag_url = FALSE;
+	}
+
 	/* If the link is being selected, don't do anything. */
 	gtk_text_buffer_get_selection_bounds(buffer, &start, &end);
 	
 	if (gtk_text_iter_get_offset(&start) != gtk_text_iter_get_offset(&end)) {
+		g_free(str);
 		return FALSE;
 	}
 
@@ -901,12 +964,11 @@ on_gm_world_text_view_url_event(GtkTextTag *tag, GObject *object,
 		
 		if (gtk_text_iter_backward_to_tag_toggle(&start, tag) &&
 				gtk_text_iter_forward_to_tag_toggle(&end, tag)) {
-			str = gtk_text_buffer_get_text(buffer, &start, &end, FALSE);
 			g_signal_emit(view, world_text_view_signals[URL_ACTIVATE], 0, str);
-			g_free(str);
 		}
 	}
 	
+	g_free(str);
 	return FALSE;
 }
 
@@ -994,7 +1056,11 @@ on_gm_world_text_view_event(GmWorldTextView *view, GdkEventMotion *event,
 	if (type != GTK_TEXT_WINDOW_TEXT) {
 		return FALSE;
 	}
-
+	
+	if (event->type != GDK_MOTION_NOTIFY) {
+		return FALSE;
+	}
+	
 	/* Get where the pointer really is. */
 	win = gtk_text_view_get_window(GTK_TEXT_VIEW(view), type);
 	gdk_window_get_pointer(win, &x, &y, NULL);
@@ -1088,3 +1154,13 @@ on_gm_world_text_view_color_table_font_changed(GmColorTable *table,
 		gchar *font_description, GmWorldTextView *view) {
 	gm_world_text_view_update_font(view);
 }
+
+void on_gm_world_text_view_drag_data_get(GmWorldTextView *view, 
+		GdkDragContext *context, GtkSelectionData *data, guint info, 
+		guint time, gpointer user_data) {
+	switch (info) {
+		case DRAG_URL:
+			gtk_selection_data_set_text(data, view->priv->drag_url_text, -1);
+		break;
+	}
+}