From 93a858b48665ce92c9f9dd42f2dfe239bd2a1a50 Mon Sep 17 00:00:00 2001
From: David Capello <david@igarastudio.com>
Date: Mon, 29 Apr 2019 16:33:17 -0300
Subject: [PATCH] Improve Shift+mouse drag in Canvas Size

Change rulers in a symmetric way from the starting ruler positions
instead from the canvas.
---
 src/app/ui/editor/select_box_state.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/app/ui/editor/select_box_state.cpp b/src/app/ui/editor/select_box_state.cpp
index dd1e2a2dc..7bd4d98b4 100644
--- a/src/app/ui/editor/select_box_state.cpp
+++ b/src/app/ui/editor/select_box_state.cpp
@@ -191,25 +191,27 @@ bool SelectBoxState::onMouseMove(Editor* editor, MouseMessage* msg)
       Ruler& oppRuler = oppositeRuler(i);
 
       switch (ruler.align() & (HORIZONTAL | VERTICAL)) {
+
         case HORIZONTAL:
           if (hasFlag(Flags::PaddingRulers) && (i == H2)) {
             int pad = m_rulers[PH].position() - m_rulers[H2].position();
             m_rulers[PH].setPosition(start.position() + delta.y + pad);
           }
+
           ruler.setPosition(start.position() + delta.y);
           if (msg->modifiers() == os::kKeyShiftModifier)
-            oppRuler.setPosition(editor->sprite()->height()
-                                 - start.position() - delta.y);
+            oppRuler.setPosition(m_startRulers[i ^ 1].position() - delta.y);
           break;
+
         case VERTICAL:
           if (hasFlag(Flags::PaddingRulers) && (i == V2)) {
             int pad = m_rulers[PV].position() - m_rulers[V2].position();
             m_rulers[PV].setPosition(start.position() + delta.x + pad);
           }
+
           ruler.setPosition(start.position() + delta.x);
           if (msg->modifiers() == os::kKeyShiftModifier)
-            oppRuler.setPosition(editor->sprite()->width()
-                                 - start.position() - delta.x);
+            oppRuler.setPosition(m_startRulers[i ^ 1].position() - delta.x);
           break;
       }
     }