Drag to create region

1 files changed, 62 insertions, 4 deletions

diff --git a/src/tool_text.c b/src/tool_text.c
index a6a17d5..038b375 100644
--- a/src/tool_text.c
+++ b/src/tool_text.c
@@ -40,6 +40,12 @@ struct text_toolinfo
 {
 	struct toolinfo  base;
 	PangoContext    *pc;
+
+	int              create_dragging;
+	double           start_corner_x;
+	double           start_corner_y;
+	double           drag_corner_x;
+	double           drag_corner_y;
 };
 
 
@@ -455,6 +461,42 @@ static void drag_object(struct toolinfo *tip, struct presentation *p,
 }
 
 
+static void start_drag_create(struct toolinfo *tip, struct presentation *p,
+                              double x, double y)
+{
+	struct text_toolinfo *ti = (struct text_toolinfo *)tip;
+
+	ti->start_corner_x = x;
+	ti->start_corner_y = y;
+	ti->create_dragging = 1;
+}
+
+
+static void drag_create(struct toolinfo *tip, struct presentation *p,
+                        double x, double y)
+{
+	struct text_toolinfo *ti = (struct text_toolinfo *)tip;
+
+	ti->drag_corner_x = x;
+	ti->drag_corner_y = y;
+
+	redraw_overlay(p);
+}
+
+
+static void finish_drag_create(struct toolinfo *tip, struct presentation *p,
+                               double x, double y)
+{
+	struct text_toolinfo *ti = (struct text_toolinfo *)tip;
+
+	ti->drag_corner_x = x;
+	ti->drag_corner_y = y;
+	ti->create_dragging = 0;
+
+	redraw_overlay(p);
+}
+
+
 static void create_default(struct presentation *p, struct style *sty,
                            struct toolinfo *tip)
 {
@@ -484,11 +526,24 @@ static int deselect_object(struct object *o, struct toolinfo *tip)
 }
 
 
-static void draw_overlay(cairo_t *cr, struct object *o)
+static void draw_overlay(struct toolinfo *tip, cairo_t *cr, struct object *o)
 {
-	draw_editing_box(cr, o->x, o->y,
-	                     o->bb_width, o->bb_height);
-	draw_caret(cr, o);
+	struct text_toolinfo *ti = (struct text_toolinfo *)tip;
+
+	if ( o != NULL ) {
+		draw_editing_box(cr, o->x, o->y, o->bb_width, o->bb_height);
+		draw_caret(cr, o);
+	}
+
+	if ( ti->create_dragging ) {
+		cairo_new_path(cr);
+		cairo_rectangle(cr, ti->start_corner_x, ti->start_corner_y,
+		                    ti->drag_corner_x - ti->start_corner_x,
+		                    ti->drag_corner_y - ti->start_corner_y);
+		cairo_set_source_rgb(cr, 0.5, 0.5, 0.5);
+		cairo_set_line_width(cr, 0.5);
+		cairo_stroke(cr);
+	}
 }
 
 
@@ -534,6 +589,9 @@ struct toolinfo *initialise_text_tool(GtkWidget *w)
 	ti->base.select = select_object;
 	ti->base.deselect = deselect_object;
 	ti->base.drag_object = drag_object;
+	ti->base.start_drag_create = start_drag_create;
+	ti->base.drag_create = drag_create;
+	ti->base.finish_drag_create = finish_drag_create;
 	ti->base.draw_editing_overlay = draw_overlay;
 	ti->base.key_pressed = key_pressed;
 	ti->base.im_commit = im_commit;