Add a simple item reordering demo based on ocornut#143 (comment)

rokups · Oct 2, 2019 · f0630b8 · f0630b8
1 parent 24790c7
commit f0630b8
Showing 1 changed file with 26 additions and 1 deletion.
diff --git a/imgui_demo.cpp b/imgui_demo.cpp
@@ -1581,7 +1581,32 @@ static void ShowDemoWindowWidgets()
         }
 
         {
-            ImGui::BulletText("Drag and drop to reorder items");
+            ImGui::BulletText("Drag to reorder items (simple)");
+            ImGui::Indent();
+
+            // Simple reordering
+            static const char* item_names[] = {"Item One", "Item Two", "Item Three", "Item Four", "Item Five"};
+            for (int n = 0; n < IM_ARRAYSIZE(item_names); n++)
+            {
+                const char* item = item_names[n];
+                ImGui::Selectable(item);
+
+                if (ImGui::IsItemActive() && !ImGui::IsItemHovered())
+                {
+                    int n_next = n + (ImGui::GetMouseDragDelta(0).y < 0.f ? -1 : 1);
+                    if (n_next >= 0 && n_next < IM_ARRAYSIZE(item_names))
+                    {
+                        item_names[n] = item_names[n_next];
+                        item_names[n_next] = item;
+                        ImGui::ResetMouseDragDelta();
+                    }
+                }
+            }
+            ImGui::Unindent();
+        }
+
+        {
+            ImGui::BulletText("Drag to reorder items (complex)");
             ImGui::Indent();
 
             static bool horizontalList = false;