From 4018c021b02a8fd75ccc19199d7e58a1b734f236 Mon Sep 17 00:00:00 2001
From: gradient <gradient@null.and.void>
Date: Fri, 20 Oct 2017 18:53:25 -0500
Subject: [PATCH] node editor: dragging!

---
 src/gui/node_editor.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/gui/node_editor.h b/src/gui/node_editor.h
index aec44f8..e98e5d0 100644
--- a/src/gui/node_editor.h
+++ b/src/gui/node_editor.h
@@ -119,7 +119,7 @@ public:
 
             Rect viewportRect = Rect(scrolling, canvas_size);
 
-            for (const auto &node : nodeList) {
+            for (auto &node : nodeList) {
                 bool visible = viewportRect.intersects(node.bbox);
                 if (visible) {
                     // TODO: this is garbage
@@ -128,6 +128,13 @@ public:
                     // -- Draw the node boxes
                     draw_list->ChannelsSetCurrent(0); // Switch to the background layer
 
+                    // draw an invisible button in the background, for dragging/hovering
+                    ImGui::SetCursorScreenPos(offset + node.bbox.pos);
+                    ImGui::InvisibleButton("node", node.bbox.size);
+
+                    if (ImGui::IsItemActive() && ImGui::IsMouseDragging(0))
+                        node.bbox.pos += ImGui::GetIO().MouseDelta;
+
                     ImVec2 upper_left = offset + node.bbox.pos;
                     ImVec2 lower_right = upper_left + node.bbox.size;