WindowServer+LibGUI: Shrink window edge resize hot-spots

The hot-spots for resizing a window by dragging its corner are now
limited to a small area around the actual corner instead of an area with
1/3rd the length or width of the window.

The hot-spots to resize a window while holding a modifier key and the
right mouse button are unchanged.

15 files changed, 107 insertions, 62 deletions

diff --git a/Userland/Libraries/LibGUI/ResizeCorner.cpp b/Userland/Libraries/LibGUI/ResizeCorner.cpp
index 2b37546363..8818a1a4ad 100644
--- a/Userland/Libraries/LibGUI/ResizeCorner.cpp
+++ b/Userland/Libraries/LibGUI/ResizeCorner.cpp
@@ -76,7 +76,7 @@ void ResizeCorner::paint_event(PaintEvent& event)
 void ResizeCorner::mousedown_event(MouseEvent& event)
 {
     if (event.button() == MouseButton::Primary)
-        window()->start_interactive_resize();
+        window()->start_interactive_resize(ResizeDirection::DownRight);
     Widget::mousedown_event(event);
 }
 
diff --git a/Userland/Libraries/LibGUI/ResizeDirection.h b/Userland/Libraries/LibGUI/ResizeDirection.h
new file mode 100644
index 0000000000..fdf8d6a0b2
--- /dev/null
+++ b/Userland/Libraries/LibGUI/ResizeDirection.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2022, Mart G <martg_@hotmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <Services/WindowServer/ResizeDirection.h>
+
+namespace GUI {
+
+using ResizeDirection = WindowServer::ResizeDirection;
+
+}
diff --git a/Userland/Libraries/LibGUI/Window.cpp b/Userland/Libraries/LibGUI/Window.cpp
index 99097112e5..a7f642b1ba 100644
--- a/Userland/Libraries/LibGUI/Window.cpp
+++ b/Userland/Libraries/LibGUI/Window.cpp
@@ -938,9 +938,9 @@ void Window::apply_icon()
     ConnectionToWindowServer::the().async_set_window_icon_bitmap(m_window_id, m_icon->to_shareable_bitmap());
 }
 
-void Window::start_interactive_resize()
+void Window::start_interactive_resize(ResizeDirection resize_direction)
 {
-    ConnectionToWindowServer::the().async_start_window_resize(m_window_id);
+    ConnectionToWindowServer::the().async_start_window_resize(m_window_id, (i32)resize_direction);
 }
 
 Vector<Widget&> Window::focusable_widgets(FocusSource source) const
diff --git a/Userland/Libraries/LibGUI/Window.h b/Userland/Libraries/LibGUI/Window.h
index fddab1f195..4a45d3d299 100644
--- a/Userland/Libraries/LibGUI/Window.h
+++ b/Userland/Libraries/LibGUI/Window.h
@@ -14,6 +14,7 @@
 #include <LibCore/Object.h>
 #include <LibGUI/FocusSource.h>
 #include <LibGUI/Forward.h>
+#include <LibGUI/ResizeDirection.h>
 #include <LibGUI/WindowMode.h>
 #include <LibGUI/WindowType.h>
 #include <LibGfx/Forward.h>
@@ -131,7 +132,7 @@ public:
     virtual void close();
     void move_to_front();
 
-    void start_interactive_resize();
+    void start_interactive_resize(ResizeDirection resize_direction);
 
     Widget* main_widget() { return m_main_widget; }
     Widget const* main_widget() const { return m_main_widget; }
diff --git a/Userland/Services/WindowServer/Compositor.cpp b/Userland/Services/WindowServer/Compositor.cpp
index 848cae499e..0baa88a656 100644
--- a/Userland/Services/WindowServer/Compositor.cpp
+++ b/Userland/Services/WindowServer/Compositor.cpp
@@ -426,6 +426,9 @@ void Compositor::compose()
                 backing_rect.set_right_without_resize(window_rect.right());
                 backing_rect.set_top(window_rect.top());
                 break;
+            default:
+                VERIFY_NOT_REACHED();
+                break;
             }
 
             Gfx::IntRect dirty_rect_in_backing_coordinates = rect.intersected(window_rect)
diff --git a/Userland/Services/WindowServer/ConnectionFromClient.cpp b/Userland/Services/WindowServer/ConnectionFromClient.cpp
index 3b2706909f..ec43090927 100644
--- a/Userland/Services/WindowServer/ConnectionFromClient.cpp
+++ b/Userland/Services/WindowServer/ConnectionFromClient.cpp
@@ -800,13 +800,17 @@ void ConnectionFromClient::set_window_alpha_hit_threshold(i32 window_id, float t
     it->value->set_alpha_hit_threshold(threshold);
 }
 
-void ConnectionFromClient::start_window_resize(i32 window_id)
+void ConnectionFromClient::start_window_resize(i32 window_id, i32 resize_direction)
 {
     auto it = m_windows.find(window_id);
     if (it == m_windows.end()) {
         did_misbehave("WM_StartWindowResize: Bad window ID");
         return;
     }
+    if (resize_direction < 0 || resize_direction >= (i32)ResizeDirection::__Count) {
+        did_misbehave("WM_StartWindowResize: Bad resize direction");
+        return;
+    }
     auto& window = *(*it).value;
     if (!window.is_resizable()) {
         dbgln("Client wants to start resizing a non-resizable window");
@@ -814,7 +818,7 @@ void ConnectionFromClient::start_window_resize(i32 window_id)
     }
     // FIXME: We are cheating a bit here by using the current cursor location and hard-coding the left button.
     //        Maybe the client should be allowed to specify what initiated this request?
-    WindowManager::the().start_window_resize(window, ScreenInput::the().cursor_location(), MouseButton::Primary);
+    WindowManager::the().start_window_resize(window, ScreenInput::the().cursor_location(), MouseButton::Primary, (ResizeDirection)resize_direction);
 }
 
 Messages::WindowServer::StartDragResponse ConnectionFromClient::start_drag(String const& text, HashMap<String, ByteBuffer> const& mime_data, Gfx::ShareableBitmap const& drag_bitmap)
diff --git a/Userland/Services/WindowServer/ConnectionFromClient.h b/Userland/Services/WindowServer/ConnectionFromClient.h
index 085f23f975..7f431dbbd1 100644
--- a/Userland/Services/WindowServer/ConnectionFromClient.h
+++ b/Userland/Services/WindowServer/ConnectionFromClient.h
@@ -109,7 +109,7 @@ private:
     virtual Messages::WindowServer::GetWindowTitleResponse get_window_title(i32) override;
     virtual Messages::WindowServer::IsMaximizedResponse is_maximized(i32) override;
     virtual void set_maximized(i32, bool) override;
-    virtual void start_window_resize(i32) override;
+    virtual void start_window_resize(i32, i32) override;
     virtual Messages::WindowServer::SetWindowRectResponse set_window_rect(i32, Gfx::IntRect const&) override;
     virtual Messages::WindowServer::GetWindowRectResponse get_window_rect(i32) override;
     virtual void set_window_minimum_size(i32, Gfx::IntSize const&) override;
diff --git a/Userland/Services/WindowServer/ResizeDirection.h b/Userland/Services/WindowServer/ResizeDirection.h
new file mode 100644
index 0000000000..f900fe3079
--- /dev/null
+++ b/Userland/Services/WindowServer/ResizeDirection.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2022, Mart G <martg_@hotmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+namespace WindowServer {
+
+enum class ResizeDirection {
+    None,
+    Left,
+    UpLeft,
+    Up,
+    UpRight,
+    Right,
+    DownRight,
+    Down,
+    DownLeft,
+    __Count
+};
+
+}
diff --git a/Userland/Services/WindowServer/WMConnectionFromClient.cpp b/Userland/Services/WindowServer/WMConnectionFromClient.cpp
index f74cf6b037..d80fa70ba6 100644
--- a/Userland/Services/WindowServer/WMConnectionFromClient.cpp
+++ b/Userland/Services/WindowServer/WMConnectionFromClient.cpp
@@ -86,7 +86,7 @@ void WMConnectionFromClient::popup_window_menu(i32 client_id, i32 window_id, Gfx
     }
 }
 
-void WMConnectionFromClient::start_window_resize(i32 client_id, i32 window_id)
+void WMConnectionFromClient::start_window_resize(i32 client_id, i32 window_id, i32 resize_direction)
 {
     auto* client = WindowServer::ConnectionFromClient::from_client_id(client_id);
     if (!client) {
@@ -101,7 +101,7 @@ void WMConnectionFromClient::start_window_resize(i32 client_id, i32 window_id)
     auto& window = *(*it).value;
     // FIXME: We are cheating a bit here by using the current cursor location and hard-coding the left button.
     //        Maybe the client should be allowed to specify what initiated this request?
-    WindowManager::the().start_window_resize(window, ScreenInput::the().cursor_location(), MouseButton::Primary);
+    WindowManager::the().start_window_resize(window, ScreenInput::the().cursor_location(), MouseButton::Primary, (ResizeDirection)resize_direction);
 }
 
 void WMConnectionFromClient::set_window_minimized(i32 client_id, i32 window_id, bool minimized)
diff --git a/Userland/Services/WindowServer/WMConnectionFromClient.h b/Userland/Services/WindowServer/WMConnectionFromClient.h
index ba93603fad..b3bb43dff9 100644
--- a/Userland/Services/WindowServer/WMConnectionFromClient.h
+++ b/Userland/Services/WindowServer/WMConnectionFromClient.h
@@ -24,7 +24,7 @@ public:
     virtual void set_active_window(i32, i32) override;
     virtual void set_window_minimized(i32, i32, bool) override;
     virtual void toggle_show_desktop() override;
-    virtual void start_window_resize(i32, i32) override;
+    virtual void start_window_resize(i32, i32, i32) override;
     virtual void popup_window_menu(i32, i32, Gfx::IntPoint const&) override;
     virtual void set_window_taskbar_rect(i32, i32, Gfx::IntRect const&) override;
     virtual void set_applet_area_position(Gfx::IntPoint const&) override;
diff --git a/Userland/Services/WindowServer/WindowFrame.cpp b/Userland/Services/WindowServer/WindowFrame.cpp
index 9c3953f406..241340e767 100644
--- a/Userland/Services/WindowServer/WindowFrame.cpp
+++ b/Userland/Services/WindowServer/WindowFrame.cpp
@@ -845,25 +845,30 @@ void WindowFrame::handle_border_mouse_event(MouseEvent const& event)
 
     auto& wm = WindowManager::the();
 
+    constexpr ResizeDirection direction_for_hot_area[3][3] = {
+        { ResizeDirection::UpLeft, ResizeDirection::Up, ResizeDirection::UpRight },
+        { ResizeDirection::Left, ResizeDirection::None, ResizeDirection::Right },
+        { ResizeDirection::DownLeft, ResizeDirection::Down, ResizeDirection::DownRight },
+    };
+    Gfx::IntRect outer_rect = { {}, rect().size() };
+    VERIFY(outer_rect.contains(event.position()));
+    int window_relative_x = event.x() - outer_rect.x();
+    int window_relative_y = event.y() - outer_rect.y();
+    int corner_size = titlebar_rect().height();
+    int hot_area_row = (window_relative_y < corner_size) ? 0 : (window_relative_y > outer_rect.height() - corner_size) ? 2
+                                                                                                                       : 1;
+    int hot_area_column = (window_relative_x < corner_size) ? 0 : (window_relative_x > outer_rect.width() - corner_size) ? 2
+                                                                                                                         : 1;
+    ResizeDirection resize_direction = direction_for_hot_area[hot_area_row][hot_area_column];
+
     if (event.type() == Event::MouseMove && event.buttons() == 0) {
-        constexpr ResizeDirection direction_for_hot_area[3][3] = {
-            { ResizeDirection::UpLeft, ResizeDirection::Up, ResizeDirection::UpRight },
-            { ResizeDirection::Left, ResizeDirection::None, ResizeDirection::Right },
-            { ResizeDirection::DownLeft, ResizeDirection::Down, ResizeDirection::DownRight },
-        };
-        Gfx::IntRect outer_rect = { {}, rect().size() };
-        VERIFY(outer_rect.contains(event.position()));
-        int window_relative_x = event.x() - outer_rect.x();
-        int window_relative_y = event.y() - outer_rect.y();
-        int hot_area_row = min(2, window_relative_y / (outer_rect.height() / 3));
-        int hot_area_column = min(2, window_relative_x / (outer_rect.width() / 3));
-        wm.set_resize_candidate(m_window, direction_for_hot_area[hot_area_row][hot_area_column]);
+        wm.set_resize_candidate(m_window, resize_direction);
         Compositor::the().invalidate_cursor();
         return;
     }
 
     if (event.type() == Event::MouseDown && event.button() == MouseButton::Primary)
-        wm.start_window_resize(m_window, event.translated(rect().location()));
+        wm.start_window_resize(m_window, event.translated(rect().location()), resize_direction);
 }
 
 void WindowFrame::handle_menubar_mouse_event(MouseEvent const& event)
diff --git a/Userland/Services/WindowServer/WindowManager.cpp b/Userland/Services/WindowServer/WindowManager.cpp
index e89aa6dca6..576194d0a5 100644
--- a/Userland/Services/WindowServer/WindowManager.cpp
+++ b/Userland/Services/WindowServer/WindowManager.cpp
@@ -699,26 +699,12 @@ void WindowManager::start_window_move(Window& window, MouseEvent const& event)
     start_window_move(window, event.position());
 }
 
-void WindowManager::start_window_resize(Window& window, Gfx::IntPoint const& position, MouseButton button)
+void WindowManager::start_window_resize(Window& window, Gfx::IntPoint const& position, MouseButton button, ResizeDirection resize_direction)
 {
     MenuManager::the().close_everyone();
 
     move_to_front_and_make_active(window);
-    constexpr ResizeDirection direction_for_hot_area[3][3] = {
-        { ResizeDirection::UpLeft, ResizeDirection::Up, ResizeDirection::UpRight },
-        { ResizeDirection::Left, ResizeDirection::None, ResizeDirection::Right },
-        { ResizeDirection::DownLeft, ResizeDirection::Down, ResizeDirection::DownRight },
-    };
-    Gfx::IntRect outer_rect = window.frame().rect();
-    if (!outer_rect.contains(position)) {
-        // FIXME: This used to be an VERIFY but crashing WindowServer over this seems silly.
-        dbgln("FIXME: !outer_rect.contains(position): outer_rect={}, position={}", outer_rect, position);
-    }
-    int window_relative_x = position.x() - outer_rect.x();
-    int window_relative_y = position.y() - outer_rect.y();
-    int hot_area_row = min(2, window_relative_y / (outer_rect.height() / 3));
-    int hot_area_column = min(2, window_relative_x / (outer_rect.width() / 3));
-    m_resize_direction = direction_for_hot_area[hot_area_row][hot_area_column];
+    m_resize_direction = resize_direction;
     if (m_resize_direction == ResizeDirection::None) {
         VERIFY(!m_resize_window);
         return;
@@ -738,15 +724,11 @@ void WindowManager::start_window_resize(Window& window, Gfx::IntPoint const& pos
     set_automatic_cursor_tracking_window(nullptr);
 
     window.invalidate(true, true);
-
-    if (hot_area_row == 0 || hot_area_column == 0) {
-        m_resize_window->set_default_positioned(false);
-    }
 }
 
-void WindowManager::start_window_resize(Window& window, MouseEvent const& event)
+void WindowManager::start_window_resize(Window& window, MouseEvent const& event, ResizeDirection resize_direction)
 {
-    start_window_resize(window, event.position(), event.button());
+    start_window_resize(window, event.position(), event.button(), resize_direction);
 }
 
 bool WindowManager::process_ongoing_window_move(MouseEvent& event)
@@ -1005,6 +987,10 @@ bool WindowManager::process_ongoing_window_resize(MouseEvent const& event)
     }
     dbgln_if(RESIZE_DEBUG, "[WM] Resizing, original: {}, now: {}", m_resize_window_original_rect, new_rect);
 
+    if (m_resize_window->rect().location() != m_resize_window_original_rect.location()) {
+        m_resize_window->set_default_positioned(false);
+    }
+
     m_resize_window->set_rect(new_rect);
     if (system_effects().geometry() == ShowGeometry::OnMoveAndResize || system_effects().geometry() == ShowGeometry::OnResizeOnly) {
         m_geometry_overlay->window_rect_changed();
@@ -1240,7 +1226,22 @@ void WindowManager::process_mouse_event_for_window(HitTestResult& result, MouseE
             return;
         }
         if (window.is_resizable() && m_keyboard_modifiers == Mod_Super && event.type() == Event::MouseDown && event.button() == MouseButton::Secondary && !window.blocking_modal_window()) {
-            start_window_resize(window, event);
+            constexpr ResizeDirection direction_for_hot_area[3][3] = {
+                { ResizeDirection::UpLeft, ResizeDirection::Up, ResizeDirection::UpRight },
+                { ResizeDirection::Left, ResizeDirection::None, ResizeDirection::Right },
+                { ResizeDirection::DownLeft, ResizeDirection::Down, ResizeDirection::DownRight },
+            };
+            Gfx::IntRect outer_rect = window.frame().rect();
+            if (!outer_rect.contains(event.position())) {
+                // FIXME: This used to be an VERIFY but crashing WindowServer over this seems silly.
+                dbgln("FIXME: !outer_rect.contains(position): outer_rect={}, position={}", outer_rect, event.position());
+            }
+            int window_relative_x = event.position().x() - outer_rect.x();
+            int window_relative_y = event.position().y() - outer_rect.y();
+            int hot_area_row = min(2, window_relative_y / (outer_rect.height() / 3));
+            int hot_area_column = min(2, window_relative_x / (outer_rect.width() / 3));
+            ResizeDirection resize_direction = direction_for_hot_area[hot_area_row][hot_area_column];
+            start_window_resize(window, event, resize_direction);
             return;
         }
     }
@@ -1949,6 +1950,9 @@ Cursor const& WindowManager::active_cursor() const
             return *m_resize_diagonally_bltr_cursor;
         case ResizeDirection::None:
             break;
+        default:
+            VERIFY_NOT_REACHED();
+            break;
         }
     }
 
diff --git a/Userland/Services/WindowServer/WindowManager.h b/Userland/Services/WindowServer/WindowManager.h
index 632520cf6d..d8ed8fd620 100644
--- a/Userland/Services/WindowServer/WindowManager.h
+++ b/Userland/Services/WindowServer/WindowManager.h
@@ -21,6 +21,7 @@
 #include <WindowServer/Event.h>
 #include <WindowServer/KeymapSwitcher.h>
 #include <WindowServer/MenuManager.h>
+#include <WindowServer/ResizeDirection.h>
 #include <WindowServer/ScreenLayout.h>
 #include <WindowServer/SystemEffects.h>
 #include <WindowServer/WMConnectionFromClient.h>
@@ -41,18 +42,6 @@ class Button;
 class DndOverlay;
 class WindowGeometryOverlay;
 
-enum class ResizeDirection {
-    None,
-    Left,
-    UpLeft,
-    Up,
-    UpRight,
-    Right,
-    DownRight,
-    Down,
-    DownLeft
-};
-
 class WindowManager : public Core::Object {
     C_OBJECT(WindowManager)
 
@@ -202,8 +191,8 @@ public:
 
     void check_hide_geometry_overlay(Window&);
 
-    void start_window_resize(Window&, Gfx::IntPoint const&, MouseButton);
-    void start_window_resize(Window&, MouseEvent const&);
+    void start_window_resize(Window&, Gfx::IntPoint const&, MouseButton, ResizeDirection);
+    void start_window_resize(Window&, MouseEvent const&, ResizeDirection);
     void start_window_move(Window&, MouseEvent const&);
     void start_window_move(Window&, Gfx::IntPoint const&);
 
diff --git a/Userland/Services/WindowServer/WindowManagerServer.ipc b/Userland/Services/WindowServer/WindowManagerServer.ipc
index cb7e215e75..8e35e1fa1c 100644
--- a/Userland/Services/WindowServer/WindowManagerServer.ipc
+++ b/Userland/Services/WindowServer/WindowManagerServer.ipc
@@ -8,7 +8,7 @@ endpoint WindowManagerServer
     set_active_window(i32 client_id, i32 window_id) =|
     set_window_minimized(i32 client_id, i32 window_id, bool minimized) =|
     toggle_show_desktop() =|
-    start_window_resize(i32 client_id, i32 window_id) =|
+    start_window_resize(i32 client_id, i32 window_id, i32 resize_direction) =|
     popup_window_menu(i32 client_id, i32 window_id, Gfx::IntPoint screen_position) =|
     set_window_taskbar_rect(i32 client_id, i32 window_id, Gfx::IntRect rect) =|
     set_applet_area_position(Gfx::IntPoint position) =|
diff --git a/Userland/Services/WindowServer/WindowServer.ipc b/Userland/Services/WindowServer/WindowServer.ipc
index b4aa09c431..867586b897 100644
--- a/Userland/Services/WindowServer/WindowServer.ipc
+++ b/Userland/Services/WindowServer/WindowServer.ipc
@@ -80,7 +80,7 @@ endpoint WindowServer
 
     get_applet_rect_on_screen(i32 window_id) => (Gfx::IntRect rect)
 
-    start_window_resize(i32 window_id) =|
+    start_window_resize(i32 window_id, i32 resize_direction) =|
 
     is_maximized(i32 window_id) => (bool maximized)
     set_maximized(i32 window_id, bool maximized) =|