From 13d7c09125f8eec703d0a43a9a87fc8aa08f7319 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Tue, 12 Jan 2021 12:17:30 +0100
Subject: Libraries: Move to Userland/Libraries/

---
 Userland/Libraries/LibGUI/StackWidget.cpp | 94 +++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 Userland/Libraries/LibGUI/StackWidget.cpp

(limited to 'Userland/Libraries/LibGUI/StackWidget.cpp')

diff --git a/Userland/Libraries/LibGUI/StackWidget.cpp b/Userland/Libraries/LibGUI/StackWidget.cpp
new file mode 100644
index 0000000000..531346195e
--- /dev/null
+++ b/Userland/Libraries/LibGUI/StackWidget.cpp
@@ -0,0 +1,94 @@
+/*
+ * 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 <LibGUI/BoxLayout.h>
+#include <LibGUI/StackWidget.h>
+#include <LibGUI/Window.h>
+
+namespace GUI {
+
+StackWidget::StackWidget()
+{
+}
+
+StackWidget::~StackWidget()
+{
+}
+
+void StackWidget::set_active_widget(Widget* widget)
+{
+    if (widget == m_active_widget)
+        return;
+
+    bool active_widget_had_focus = m_active_widget && m_active_widget->has_focus_within();
+
+    if (m_active_widget)
+        m_active_widget->set_visible(false);
+    m_active_widget = widget;
+    if (m_active_widget) {
+        m_active_widget->set_relative_rect(rect());
+        if (active_widget_had_focus)
+            m_active_widget->set_focus(true);
+        m_active_widget->set_visible(true);
+    }
+
+    set_focus_proxy(m_active_widget);
+
+    if (on_active_widget_change)
+        on_active_widget_change(m_active_widget);
+}
+
+void StackWidget::resize_event(ResizeEvent& event)
+{
+    if (!m_active_widget)
+        return;
+    m_active_widget->set_relative_rect({ {}, event.size() });
+}
+
+void StackWidget::child_event(Core::ChildEvent& event)
+{
+    if (!event.child() || !is<Widget>(*event.child()))
+        return Widget::child_event(event);
+    auto& child = downcast<Widget>(*event.child());
+    if (event.type() == Event::ChildAdded) {
+        if (!m_active_widget)
+            set_active_widget(&child);
+        else if (m_active_widget != &child)
+            child.set_visible(false);
+    } else if (event.type() == Event::ChildRemoved) {
+        if (m_active_widget == &child) {
+            Widget* new_active_widget = nullptr;
+            for_each_child_widget([&](auto& new_child) {
+                new_active_widget = &new_child;
+                return IterationDecision::Break;
+            });
+            set_active_widget(new_active_widget);
+        }
+    }
+    Widget::child_event(event);
+}
+
+}
-- 
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