1 files changed, 71 insertions, 0 deletions
diff --git a/Userland/Services/Taskbar/WindowList.cpp b/Userland/Services/Taskbar/WindowList.cpp
new file mode 100644
index 0000000000..84021be160
--- /dev/null
+++ b/Userland/Services/Taskbar/WindowList.cpp
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "WindowList.h"
+
+WindowList& WindowList::the()
+{
+    static WindowList* s_the;
+    if (!s_the)
+        s_the = new WindowList;
+    return *s_the;
+}
+
+Window* WindowList::find_parent(const Window& window)
+{
+    if (!window.parent_identifier().is_valid())
+        return nullptr;
+    for (auto& it : m_windows) {
+        auto& w = *it.value;
+        if (w.identifier() == window.parent_identifier())
+            return &w;
+    }
+    return nullptr;
+}
+
+Window* WindowList::window(const WindowIdentifier& identifier)
+{
+    auto it = m_windows.find(identifier);
+    if (it != m_windows.end())
+        return it->value;
+    return nullptr;
+}
+
+Window& WindowList::ensure_window(const WindowIdentifier& identifier)
+{
+    auto it = m_windows.find(identifier);
+    if (it != m_windows.end())
+        return *it->value;
+    auto window = make<Window>(identifier);
+    auto& window_ref = *window;
+    m_windows.set(identifier, move(window));
+    return window_ref;
+}
+
+void WindowList::remove_window(const WindowIdentifier& identifier)
+{
+    m_windows.remove(identifier);
+}