WindowServer+LibGUI: Implement minimizable property to windows

Libraries/LibGUI/GWindow.cpp

@@ -61,6 +61,7 @@ void GWindow::show()
         m_rect_when_windowless,
         m_has_alpha_channel,
         m_modal,
+        m_minimizable,
         m_resizable,
         m_fullscreen,
         m_show_titlebar,
@@ -549,6 +550,7 @@ void GWindow::save_to(AK::JsonObject& json)
     json.set("title", title());
     json.set("visible", is_visible());
     json.set("active", is_active());
+    json.set("minimizable", is_minimizable());
     json.set("resizable", is_resizable());
     json.set("fullscreen", is_fullscreen());
     json.set("rect", rect().to_string());

Libraries/LibGUI/GWindow.h

@@ -40,6 +40,9 @@ public:
     bool is_resizable() const { return m_resizable; }
     void set_resizable(bool resizable) { m_resizable = resizable; }
 
+    bool is_minimizable() const { return m_minimizable; }
+    void set_minimizable(bool minimizable) { m_minimizable = minimizable; }
+
     void set_double_buffering_enabled(bool);
     void set_has_alpha_channel(bool);
     void set_opacity(float);
@@ -175,6 +178,7 @@ private:
     bool m_double_buffering_enabled { true };
     bool m_modal { false };
     bool m_resizable { true };
+    bool m_minimizable { true };
     bool m_fullscreen { false };
     bool m_show_titlebar { true };
     bool m_layout_pending { false };

Servers/WindowServer/WSClientConnection.cpp

@@ -394,7 +394,7 @@ OwnPtr<WindowServer::GetClipboardContentsResponse> WSClientConnection::handle(co
 OwnPtr<WindowServer::CreateWindowResponse> WSClientConnection::handle(const WindowServer::CreateWindow& message)
 {
     int window_id = m_next_window_id++;
-    auto window = WSWindow::construct(*this, (WSWindowType)message.type(), window_id, message.modal(), message.resizable(), message.fullscreen());
+    auto window = WSWindow::construct(*this, (WSWindowType)message.type(), window_id, message.modal(), message.minimizable(), message.resizable(), message.fullscreen());
     window->set_has_alpha_channel(message.has_alpha_channel());
     window->set_title(message.title());
     if (!message.fullscreen())

Servers/WindowServer/WSWindow.cpp

@@ -28,11 +28,12 @@ WSWindow::WSWindow(CObject& parent, WSWindowType type)
     WSWindowManager::the().add_window(*this);
 }
 
-WSWindow::WSWindow(WSClientConnection& client, WSWindowType window_type, int window_id, bool modal, bool resizable, bool fullscreen)
+WSWindow::WSWindow(WSClientConnection& client, WSWindowType window_type, int window_id, bool modal, bool minimizable, bool resizable, bool fullscreen)
     : CObject(&client)
     , m_client(&client)
     , m_type(window_type)
     , m_modal(modal)
+    , m_minimizable(minimizable)
     , m_resizable(resizable)
     , m_fullscreen(fullscreen)
     , m_window_id(window_id)
@@ -102,6 +103,8 @@ void WSWindow::set_minimized(bool minimized)
 {
     if (m_minimized == minimized)
         return;
+    if (minimized && !m_minimizable)
+        return;
     m_minimized = minimized;
     start_minimize_animation();
     if (!minimized)
@@ -110,6 +113,14 @@ void WSWindow::set_minimized(bool minimized)
     WSWindowManager::the().notify_minimization_state_changed(*this);
 }
 
+void WSWindow::set_minimizable(bool minimizable)
+{
+    if (m_minimizable == minimizable)
+        return;
+    m_minimizable = minimizable;
+    // TODO: Hide/show (or alternatively change enabled state of) window minimize button dynamically depending on value of m_minimizable
+}
+
 void WSWindow::set_opacity(float opacity)
 {
      if (m_opacity == opacity)
@@ -130,6 +141,8 @@ void WSWindow::set_maximized(bool maximized)
 {
     if (m_maximized == maximized)
         return;
+    if (maximized && !is_resizable())
+        return;
     m_maximized = maximized;
     auto old_rect = m_rect;
     if (maximized) {
@@ -142,6 +155,14 @@ void WSWindow::set_maximized(bool maximized)
     CEventLoop::current().post_event(*this, make<WSResizeEvent>(old_rect, m_rect));
 }
 
+void WSWindow::set_resizable(bool resizable)
+{
+    if (m_resizable == resizable)
+        return;
+    m_resizable = resizable;
+    // TODO: Hide/show (or alternatively change enabled state of) window maximize button dynamically depending on value of is_resizable()
+}
+
 void WSWindow::event(CEvent& event)
 {
     if (!m_client) {

Servers/WindowServer/WSWindow.h

@@ -31,7 +31,7 @@ class WSWindow final : public CObject
     , public InlineLinkedListNode<WSWindow> {
     C_OBJECT(WSWindow)
 public:
-    WSWindow(WSClientConnection&, WSWindowType, int window_id, bool modal, bool resizable, bool fullscreen);
+    WSWindow(WSClientConnection&, WSWindowType, int window_id, bool modal, bool minimizable, bool resizable, bool fullscreen);
     WSWindow(CObject&, WSWindowType);
     virtual ~WSWindow() override;
 
@@ -44,6 +44,12 @@ public:
     bool is_minimized() const { return m_minimized; }
     void set_minimized(bool);
 
+    bool is_minimizable() const { return m_minimizable; }
+    void set_minimizable(bool);
+
+    bool is_resizable() const { return m_resizable && !m_fullscreen; }
+    void set_resizable(bool);
+
     bool is_maximized() const { return m_maximized; }
     void set_maximized(bool);
 
@@ -95,8 +101,6 @@ public:
 
     bool is_modal() const { return m_modal; }
 
-    bool is_resizable() const { return m_resizable && !m_fullscreen; }
-
     Rect rect() const { return m_rect; }
     void set_rect(const Rect&);
     void set_rect(int x, int y, int width, int height) { set_rect({ x, y, width, height }); }
@@ -198,6 +202,7 @@ private:
     bool m_visible { true };
     bool m_has_alpha_channel { false };
     bool m_modal { false };
+    bool m_minimizable { false };
     bool m_resizable { false };
     bool m_listens_to_wm_events { false };
     bool m_minimized { false };

Servers/WindowServer/WSWindowFrame.cpp

@@ -102,9 +102,13 @@ WSWindowFrame::WSWindowFrame(WSWindow& window)
         m_buttons.append(move(button));
     }
 
-    m_buttons.append(make<WSButton>(*this, *s_minimize_button_bitmap, [this](auto&) {
-        m_window.set_minimized(true);
-    }));
+    if (window.is_minimizable()) {
+        auto button = make<WSButton>(*this, *s_minimize_button_bitmap, [this](auto&) {
+            m_window.set_minimized(true);
+        });
+        m_minimize_button = button.ptr();
+        m_buttons.append(move(button));
+    }
 }
 
 WSWindowFrame::~WSWindowFrame()

Servers/WindowServer/WSWindowFrame.h

@@ -30,4 +30,5 @@ private:
     WSWindow& m_window;
     NonnullOwnPtrVector<WSButton> m_buttons;
     WSButton* m_maximize_button { nullptr };
+    WSButton* m_minimize_button { nullptr };
 };

Servers/WindowServer/WindowServer.ipc

@@ -20,6 +20,7 @@ endpoint WindowServer = 2
         Rect rect,
         bool has_alpha_channel,
         bool modal,
+        bool minimizable,
         bool resizable,
         bool fullscreen,
         bool show_titlebar,