fix color picker, add project delete button with message box

engine/node_dialog_open.cpp

@@ -4,6 +4,8 @@
 #include "canvas.h"
 #include "node_image_texture.h"
 #include "asset.h"
+#include "node_message_box.h"
+#include "app.h"
 
 Node* NodeDialogOpen::clone_instantiate() const
 {
@@ -32,6 +34,40 @@ void NodeDialogOpen::init_controls()
     btn_cancel->on_click = [this](Node*) {
         destroy();
     };
+    btn_delete = find<NodeButton>("btn-delete");
+    btn_delete->on_click = [this](Node*) {
+        if (!current)
+            return;
+        
+        auto msgbox = new NodeMessageBox();
+        msgbox->m_manager = m_manager;
+        msgbox->init();
+        msgbox->m_title->set_text("Delete Project");
+        msgbox->m_message->set_text(("Are you sure you want to delete " + current->m_file_name + "?").c_str());
+        msgbox->btn_ok->on_click = [this,msgbox](Node*){
+            auto path = current->m_path;
+            int idx = container->get_child_index(current);
+            container->remove_child(current);
+            if (!container->m_children.empty())
+            {
+                int newidx = std::min<int>(idx, (int)container->m_children.size() - 1);
+                auto next = (NodeDialogOpenItem*)container->get_child_at(newidx);
+                current = nullptr;
+                next->on_selected(next);
+                next->m_selected = true;
+            }
+            else
+            {
+                current = nullptr;
+                auto image_tex = find<NodeImageTexture>("thumb-tex");
+                image_tex->tex.destroy();
+            }
+            Asset::delete_file(path);
+            msgbox->destroy();
+        };
+        root()->add_child(msgbox);
+        root()->update();
+    };
     container = find<Node>("files-list");
     auto names = Asset::list_files(data_path, false, ".*\\.pano");
     for (const auto& n : names)
@@ -43,7 +79,6 @@ void NodeDialogOpen::init_controls()
         node->m_path = data_path + "/" + n;
         node->m_file_name = n;
         node->on_selected = [&](NodeDialogOpenItem* target) {
-            static NodeDialogOpenItem* current = nullptr;
             if (target == current)
                 return;
             ui::Image thumb = ui::Canvas::I->thumbnail_read(target->m_path);