From a967a2c3b8cae595d6a9114f4933a28c4818959a Mon Sep 17 00:00:00 2001
From: Přemysl Janouch <p.janouch@gmail.com>
Date: Tue, 1 Feb 2011 14:43:02 +0100
Subject: Bind actions to cursor keys in LdCanvas.

If there's a selection, move it. Otherwise move the viewport.
---
 liblogdiag/ld-canvas.c     | 61 ++++++++++++++++++++++++++++++++++++++++++++++
 liblogdiag/ld-canvas.h     |  4 ++-
 liblogdiag/ld-marshal.list |  1 +
 3 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/liblogdiag/ld-canvas.c b/liblogdiag/ld-canvas.c
index 779d92b..1d05b4b 100644
--- a/liblogdiag/ld-canvas.c
+++ b/liblogdiag/ld-canvas.c
@@ -172,6 +172,7 @@ static void on_adjustment_value_changed
 static void on_size_allocate (GtkWidget *widget, GtkAllocation *allocation,
 	gpointer user_data);
 static void update_adjustments (LdCanvas *self);
+static void ld_canvas_real_move (LdCanvas *self, gdouble dx, gdouble dy);
 
 static void diagram_connect_signals (LdCanvas *self);
 static void diagram_disconnect_signals (LdCanvas *self);
@@ -247,10 +248,19 @@ ld_canvas_class_init (LdCanvasClass *klass)
 
 	klass->set_scroll_adjustments = ld_canvas_real_set_scroll_adjustments;
 	klass->cancel_operation = ld_canvas_real_cancel_operation;
+	klass->move = ld_canvas_real_move;
 
 	binding_set = gtk_binding_set_by_class (klass);
 	gtk_binding_entry_add_signal (binding_set, GDK_Escape, 0,
 		"cancel-operation", 0);
+	gtk_binding_entry_add_signal (binding_set, GDK_Left, 0,
+		"move", 2, G_TYPE_DOUBLE, (gdouble) -1, G_TYPE_DOUBLE, (gdouble) 0);
+	gtk_binding_entry_add_signal (binding_set, GDK_Right, 0,
+		"move", 2, G_TYPE_DOUBLE, (gdouble) 1, G_TYPE_DOUBLE, (gdouble) 0);
+	gtk_binding_entry_add_signal (binding_set, GDK_Up, 0,
+		"move", 2, G_TYPE_DOUBLE, (gdouble) 0, G_TYPE_DOUBLE, (gdouble) -1);
+	gtk_binding_entry_add_signal (binding_set, GDK_Down, 0,
+		"move", 2, G_TYPE_DOUBLE, (gdouble) 0, G_TYPE_DOUBLE, (gdouble) 1);
 
 /**
  * LdCanvas:diagram:
@@ -311,6 +321,21 @@ ld_canvas_class_init (LdCanvasClass *klass)
 		g_cclosure_marshal_VOID__VOID,
 		G_TYPE_NONE, 0);
 
+/**
+ * LdCanvas::move:
+ * @self: an #LdCanvas object.
+ * @dx: The difference by which to move on the horizontal axis.
+ * @dy: The difference by which to move on the vertical axis.
+ *
+ * Move the selection, if any, or the document.
+ */
+	klass->move_signal = g_signal_new
+		("move", G_TYPE_FROM_CLASS (klass),
+		G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+		G_STRUCT_OFFSET (LdCanvasClass, move), NULL, NULL,
+		ld_marshal_VOID__DOUBLE_DOUBLE,
+		G_TYPE_NONE, 2, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
+
 	g_type_class_add_private (klass, sizeof (LdCanvasPrivate));
 }
 
@@ -552,6 +577,42 @@ update_adjustments (LdCanvas *self)
 	}
 }
 
+static void
+ld_canvas_real_move (LdCanvas *self, gdouble dx, gdouble dy)
+{
+	LdDiagram *diagram;
+	GList *selection, *iter;
+
+	/* TODO: Check/move boundaries, also implement normal
+	 *       getters and setters for priv->x and priv->y.
+	 */
+	diagram = self->priv->diagram;
+	selection = ld_diagram_get_selection (diagram);
+	if (selection)
+	{
+		ld_diagram_begin_user_action (diagram);
+		for (iter = selection; iter; iter = g_list_next (iter))
+		{
+			gdouble x, y;
+
+			g_object_get (iter->data, "x", &x, "y", &y, NULL);
+			x += dx;
+			y += dy;
+			g_object_set (iter->data, "x", x, "y", y, NULL);
+		}
+		ld_diagram_end_user_action (diagram);
+	}
+	else
+	{
+		self->priv->x += dx;
+		self->priv->y += dy;
+
+		simulate_motion (self);
+		update_adjustments (self);
+	}
+	gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
 
 /* ===== Generic interface etc. ============================================ */
 
diff --git a/liblogdiag/ld-canvas.h b/liblogdiag/ld-canvas.h
index b7e66d8..ae42f26 100644
--- a/liblogdiag/ld-canvas.h
+++ b/liblogdiag/ld-canvas.h
@@ -2,7 +2,7 @@
  * ld-canvas.h
  *
  * This file is a part of logdiag.
- * Copyright Přemysl Janouch 2010. All rights reserved.
+ * Copyright Přemysl Janouch 2010 - 2011. All rights reserved.
  *
  * See the file LICENSE for licensing information.
  *
@@ -47,10 +47,12 @@ struct _LdCanvasClass
 	GtkDrawingAreaClass parent_class;
 
 	guint cancel_operation_signal;
+	guint move_signal;
 
 	void (*set_scroll_adjustments) (LdCanvas *self,
 		GtkAdjustment *horizontal, GtkAdjustment *vertical);
 	void (*cancel_operation) (LdCanvas *self);
+	void (*move) (LdCanvas *self, gdouble dx, gdouble dy);
 };
 
 
diff --git a/liblogdiag/ld-marshal.list b/liblogdiag/ld-marshal.list
index 20c67c0..b44af85 100644
--- a/liblogdiag/ld-marshal.list
+++ b/liblogdiag/ld-marshal.list
@@ -1,2 +1,3 @@
 VOID:OBJECT,OBJECT
 VOID:OBJECT,STRING
+VOID:DOUBLE,DOUBLE
-- 
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