Add popup menu. Fix a potential bug in window destroy.

2 files changed, 78 insertions, 0 deletions

diff --git a/src/ui/controls/popup_menu.cpp b/src/ui/controls/popup_menu.cpp
new file mode 100644
index 00000000..88ea8f17
--- /dev/null
+++ b/src/ui/controls/popup_menu.cpp
@@ -0,0 +1,58 @@
+#include "popup_menu.hpp"
+
+#include "ui/window.hpp"
+#include "text_block.hpp"
+#include "list_item.hpp"
+#include "linear_layout.hpp"
+#include "ui/events/ui_event.hpp"
+
+namespace cru::ui::controls
+{
+    Window* CreatePopupMenu(const Point& anchor, const std::vector<MenuItemInfo>& items, Window* parent)
+    {
+        const auto popup = Window::CreatePopup(parent);
+
+        popup->lose_focus_event.AddHandler([popup](events::FocusChangeEventArgs& args)
+        {
+            if (args.IsWindow())
+                popup->Close();
+        });
+
+        const auto create_menu_item = [popup](const String& text, const std::function<void()>& action) -> ListItem*
+        {
+            auto text_block = TextBlock::Create(text);
+            text_block->GetLayoutParams()->width.alignment = Alignment::Start;
+
+            auto list_item = CreateWithLayout<ListItem>(
+                LayoutSideParams::Stretch(Alignment::Center),
+                LayoutSideParams::Content(Alignment::Start),
+                ControlList{ text_block }
+            );
+
+            list_item->mouse_click_event.AddHandler([popup, action](events::MouseButtonEventArgs& args)
+            {
+                if (args.GetMouseButton() == MouseButton::Left)
+                {
+                    action();
+                    popup->Close();
+                }
+            });
+
+            return list_item;
+        };
+
+        const auto menu = LinearLayout::Create(LinearLayout::Orientation::Vertical);
+
+        menu->SetBordered(true);
+
+        for (const auto& item : items)
+            menu->AddChild(create_menu_item(item.first, item.second));
+
+        popup->AddChild(menu);
+
+        popup->SetSizeFitContent();
+        popup->SetWindowPosition(anchor);
+
+        return popup;
+    }
+}
diff --git a/src/ui/controls/popup_menu.hpp b/src/ui/controls/popup_menu.hpp
new file mode 100644
index 00000000..d47e3eb6
--- /dev/null
+++ b/src/ui/controls/popup_menu.hpp
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <vector>
+#include <utility>
+#include <functional>
+
+#include "base.hpp"
+#include "ui/ui_base.hpp"
+
+namespace cru::ui
+{
+    class Window;
+}
+
+namespace cru::ui::controls
+{
+    using MenuItemInfo = std::pair<String, std::function<void()>>;
+
+    Window* CreatePopupMenu(const Point& anchor, const std::vector<MenuItemInfo>& items, Window* parent = nullptr);
+}