WindowServer, LibGUI: Variable minimum window sizes

Minimum window size can now be customised and set at runtime via the
SetWindowMinimumSize WindowServer message and the set_minimum_size
LibGUI::Window method. The default minimum size remains at 50x50.

Some behind-the-scenes mechanics had to be added to LibGUI::Window to
ensure that the minimum size is remembered if set before the window is
shown. WindowServer sends a resize event to the client if it requests a
size on create that's smaller than it's minimum size.

1 files changed, 6 insertions, 0 deletions

diff --git a/Userland/Libraries/LibGUI/Window.h b/Userland/Libraries/LibGUI/Window.h
index aca7e0842e..50843e5d78 100644
--- a/Userland/Libraries/LibGUI/Window.h
+++ b/Userland/Libraries/LibGUI/Window.h
@@ -108,6 +108,10 @@ public:
 
     Gfx::IntPoint position() const { return rect().location(); }
 
+    Gfx::IntSize minimum_size() const;
+    void set_minimum_size(const Gfx::IntSize&);
+    void set_minimum_size(int width, int height) { set_minimum_size({ width, height }); }
+
     void move_to(int x, int y) { move_to({ x, y }); }
     void move_to(const Gfx::IntPoint& point) { set_rect({ point, size() }); }
 
@@ -248,6 +252,8 @@ private:
     WeakPtr<Widget> m_automatic_cursor_tracking_widget;
     WeakPtr<Widget> m_hovered_widget;
     Gfx::IntRect m_rect_when_windowless;
+    Gfx::IntSize m_minimum_size_when_windowless { 50, 50 };
+    bool m_minimum_size_modified { false };
     String m_title_when_windowless;
     Vector<Gfx::IntRect, 32> m_pending_paint_event_rects;
     Gfx::IntSize m_size_increment;