MouseSettings: Add tab to configure cursor highlighting

This adds a nice little tab, including a preview, for configuring
the cursor highlighting. Which allows setting the color, size/radius,
and opacity.

7 files changed, 295 insertions, 1 deletions

diff --git a/Userland/Applications/MouseSettings/CMakeLists.txt b/Userland/Applications/MouseSettings/CMakeLists.txt
index 974f07bc02..402121ff83 100644
--- a/Userland/Applications/MouseSettings/CMakeLists.txt
+++ b/Userland/Applications/MouseSettings/CMakeLists.txt
@@ -6,10 +6,14 @@ serenity_component(
 
 compile_gml(Mouse.gml MouseWidgetGML.h mouse_widget_gml)
 compile_gml(Theme.gml ThemeWidgetGML.h theme_widget_gml)
+compile_gml(Highlight.gml HighlightWidgetGML.h highlight_widget_gml)
 
 set(SOURCES
     main.cpp
     DoubleClickArrowWidget.cpp
+    HighlightPreviewWidget.cpp
+    HighlightWidget.cpp
+    HighlightWidgetGML.h
     MouseWidget.cpp
     MouseWidget.h
     MouseWidgetGML.h
diff --git a/Userland/Applications/MouseSettings/Highlight.gml b/Userland/Applications/MouseSettings/Highlight.gml
new file mode 100644
index 0000000000..f7c2bda5a6
--- /dev/null
+++ b/Userland/Applications/MouseSettings/Highlight.gml
@@ -0,0 +1,99 @@
+@GUI::Frame {
+    fill_with_background_color: true
+    layout: @GUI::VerticalBoxLayout {
+        margins: [10]
+    }
+
+    @GUI::Frame {
+        layout: @GUI::HorizontalBoxLayout {}
+        name: "preview_frame"
+        fixed_width: 136
+        fixed_height: 136
+    }
+
+    @GUI::GroupBox {
+        title: "Highlight color"
+        fixed_height: 80
+        layout: @GUI::VerticalBoxLayout {
+            margins: [6]
+            spacing: 2
+        }
+
+        @GUI::Widget {}
+
+        @GUI::ColorInput {
+            name: "highlight_color_input"
+            has_alpha_channel: false
+        }
+
+        @GUI::Widget {}
+    }
+
+    @GUI::GroupBox {
+        title: "Highlight opacity"
+        fixed_height: 80
+        layout: @GUI::VerticalBoxLayout {
+            margins: [6]
+            spacing: 2
+        }
+
+        @GUI::Widget {
+            layout: @GUI::HorizontalBoxLayout {
+                margins: [8]
+                spacing: 8
+            }
+
+            @GUI::Label {
+                autosize: true
+                text: "0%"
+            }
+
+            @GUI::Slider {
+                name: "highlight_opacity_slider"
+                orientation: "Horizontal"
+                max: 230
+                min: 0
+                value: 80
+            }
+
+            @GUI::Label {
+                autosize: true
+                text: "100%"
+            }
+        }
+    }
+
+    @GUI::GroupBox {
+        title: "Highlight size"
+        fixed_height: 80
+        layout: @GUI::VerticalBoxLayout {
+            margins: [6]
+            spacing: 2
+        }
+
+        @GUI::Widget {
+            layout: @GUI::HorizontalBoxLayout {
+                margins: [8]
+                spacing: 8
+            }
+
+            @GUI::Label {
+                autosize: true
+                text: "Off"
+            }
+
+            @GUI::Slider {
+                name: "highlight_radius_slider"
+                orientation: "Horizontal"
+                max: 60
+                min: 19
+                value: 30
+            }
+
+            @GUI::Label {
+                autosize: true
+                text: "Largest"
+            }
+        }
+    }
+}
diff --git a/Userland/Applications/MouseSettings/HighlightPreviewWidget.cpp b/Userland/Applications/MouseSettings/HighlightPreviewWidget.cpp
new file mode 100644
index 0000000000..e7372e7a00
--- /dev/null
+++ b/Userland/Applications/MouseSettings/HighlightPreviewWidget.cpp
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2022, MacDue <macdue@dueutil.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "HighlightPreviewWidget.h"
+#include <AK/String.h>
+#include <LibGUI/ConnectionToWindowServer.h>
+#include <LibGUI/Painter.h>
+#include <LibGfx/AntiAliasingPainter.h>
+
+namespace MouseSettings {
+
+HighlightPreviewWidget::HighlightPreviewWidget(Gfx::Palette const& palette)
+    : GUI::AbstractThemePreview(palette)
+{
+    auto cursor_theme = GUI::ConnectionToWindowServer::the().get_cursor_theme();
+    m_cursor_bitmap = Gfx::Bitmap::try_load_from_file(String::formatted("/res/cursor-themes/{}/arrow.x2y2.png", cursor_theme)).release_value_but_fixme_should_propagate_errors();
+}
+
+void HighlightPreviewWidget::paint_preview(GUI::PaintEvent&)
+{
+    GUI::Painter painter(*this);
+    if (m_radius > 0 && m_color.alpha() > 0) {
+        Gfx::AntiAliasingPainter aa_painter { painter };
+        Gfx::IntRect highlight_rect { 0, 0, m_radius * 2, m_radius * 2 };
+        highlight_rect.center_within(frame_inner_rect());
+        aa_painter.fill_ellipse(highlight_rect, m_color);
+    }
+    painter.blit(m_cursor_bitmap->rect().centered_within(frame_inner_rect()).location(), *m_cursor_bitmap, m_cursor_bitmap->rect());
+}
+
+}
diff --git a/Userland/Applications/MouseSettings/HighlightPreviewWidget.h b/Userland/Applications/MouseSettings/HighlightPreviewWidget.h
new file mode 100644
index 0000000000..72d638db94
--- /dev/null
+++ b/Userland/Applications/MouseSettings/HighlightPreviewWidget.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2022, MacDue <macdue@dueutil.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGUI/AbstractThemePreview.h>
+#include <LibGfx/Color.h>
+
+namespace MouseSettings {
+
+class HighlightPreviewWidget final : public GUI::AbstractThemePreview {
+    C_OBJECT(HighlightPreviewWidget)
+public:
+    virtual ~HighlightPreviewWidget() override = default;
+
+    virtual void paint_preview(GUI::PaintEvent&) override;
+
+    void set_radius(int radius)
+    {
+        m_radius = radius;
+        update();
+    }
+
+    void set_color(Gfx::Color const& color)
+    {
+        m_color = color;
+        update();
+    }
+
+private:
+    explicit HighlightPreviewWidget(Gfx::Palette const& palette);
+
+    RefPtr<Gfx::Bitmap> m_cursor_bitmap;
+
+    int m_radius { 0 };
+    Gfx::Color m_color;
+};
+
+}
diff --git a/Userland/Applications/MouseSettings/HighlightWidget.cpp b/Userland/Applications/MouseSettings/HighlightWidget.cpp
new file mode 100644
index 0000000000..50079140d4
--- /dev/null
+++ b/Userland/Applications/MouseSettings/HighlightWidget.cpp
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2022, MacDue <macdue@dueutil.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "HighlightWidget.h"
+
+#include <Applications/MouseSettings/HighlightWidgetGML.h>
+#include <LibGUI/ConnectionToWindowServer.h>
+
+HighlightWidget::HighlightWidget()
+{
+    load_from_gml(highlight_widget_gml);
+
+    m_highlight_preview = find_descendant_of_type_named<GUI::Frame>("preview_frame")->add<MouseSettings::HighlightPreviewWidget>(palette());
+
+    auto current_highlight_color = GUI::ConnectionToWindowServer::the().get_cursor_highlight_color();
+    auto current_highlight_color_no_alpha = current_highlight_color;
+    current_highlight_color_no_alpha.set_alpha(255);
+    m_highlight_color_input = *find_descendant_of_type_named<GUI::ColorInput>("highlight_color_input");
+    m_highlight_color_input->set_color(current_highlight_color_no_alpha);
+    m_highlight_color_input->on_change = [&]() {
+        m_highlight_preview->set_color(highlight_color());
+        set_modified(true);
+    };
+
+    m_highlight_opacity_slider = *find_descendant_of_type_named<GUI::Slider>("highlight_opacity_slider");
+    m_highlight_opacity_slider->set_value(current_highlight_color.alpha());
+    m_highlight_opacity_slider->on_change = [&](int) {
+        m_highlight_preview->set_color(highlight_color());
+        set_modified(true);
+    };
+
+    m_highlight_radius_slider = *find_descendant_of_type_named<GUI::Slider>("highlight_radius_slider");
+    m_highlight_radius_slider->set_value(GUI::ConnectionToWindowServer::the().get_cursor_highlight_radius());
+    m_highlight_radius_slider->on_change = [&](int) {
+        m_highlight_preview->set_radius(highlight_radius());
+        set_modified(true);
+    };
+
+    m_highlight_preview->set_color(highlight_color());
+    m_highlight_preview->set_radius(highlight_radius());
+}
+
+Gfx::Color HighlightWidget::highlight_color()
+{
+    auto color = m_highlight_color_input->color();
+    color.set_alpha(m_highlight_opacity_slider->value());
+    return color;
+}
+
+int HighlightWidget::highlight_radius()
+{
+    auto current_value = m_highlight_radius_slider->value();
+    if (current_value <= m_highlight_radius_slider->min())
+        return 0;
+    return current_value;
+}
+
+void HighlightWidget::apply_settings()
+{
+    GUI::ConnectionToWindowServer::the().async_set_cursor_highlight_radius(highlight_radius());
+    GUI::ConnectionToWindowServer::the().async_set_cursor_highlight_color(highlight_color());
+}
+
+void HighlightWidget::reset_default_values()
+{
+    constexpr auto default_highlight_color = Gfx::Color::NamedColor::Yellow;
+    constexpr auto default_highlight_opacity = 80; // (in range of 0-255)
+    // Disable the highlighting by default.
+    // The range of radii you can configure the highlight to is 20 to 60px,
+    // anything less than that is treated as 'no highlighting'.
+    constexpr auto default_highlight_radius_length = 19;
+    m_highlight_color_input->set_color(default_highlight_color);
+    m_highlight_opacity_slider->set_value(default_highlight_opacity);
+    m_highlight_radius_slider->set_value(default_highlight_radius_length);
+}
diff --git a/Userland/Applications/MouseSettings/HighlightWidget.h b/Userland/Applications/MouseSettings/HighlightWidget.h
new file mode 100644
index 0000000000..8dfd75fc3c
--- /dev/null
+++ b/Userland/Applications/MouseSettings/HighlightWidget.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2022, MacDue <macdue@dueutil.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include "HighlightPreviewWidget.h"
+#include <LibGUI/ColorInput.h>
+#include <LibGUI/SettingsWindow.h>
+#include <LibGUI/Slider.h>
+#include <LibGUI/Window.h>
+
+class HighlightWidget final : public GUI::SettingsWindow::Tab {
+    C_OBJECT(HighlightWidget)
+public:
+    virtual ~HighlightWidget() override = default;
+
+    virtual void apply_settings() override;
+    virtual void reset_default_values() override;
+
+private:
+    Gfx::Color highlight_color();
+
+    int highlight_radius();
+
+    HighlightWidget();
+    RefPtr<MouseSettings::HighlightPreviewWidget> m_highlight_preview;
+    RefPtr<GUI::ColorInput> m_highlight_color_input;
+    RefPtr<GUI::Slider> m_highlight_opacity_slider;
+    RefPtr<GUI::Slider> m_highlight_radius_slider;
+};
diff --git a/Userland/Applications/MouseSettings/main.cpp b/Userland/Applications/MouseSettings/main.cpp
index ca004fb9e9..82c200c3e4 100644
--- a/Userland/Applications/MouseSettings/main.cpp
+++ b/Userland/Applications/MouseSettings/main.cpp
@@ -3,10 +3,12 @@
  * Copyright (c) 2021, the SerenityOS developers.
  * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
  * Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2022, MacDue <macdue@dueutil.tech>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include "HighlightWidget.h"
 #include "MouseWidget.h"
 #include "ThemeWidget.h"
 #include <LibCore/ArgsParser.h>
@@ -26,7 +28,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     StringView selected_tab;
     Core::ArgsParser args_parser;
-    args_parser.add_option(selected_tab, "Tab, one of 'cursor-theme' or 'mouse'", "open-tab", 't', "tab");
+    args_parser.add_option(selected_tab, "Tab, one of 'cursor-theme', 'cursor-highlight',  or 'mouse'", "open-tab", 't', "tab");
     args_parser.parse(arguments);
 
     auto app_icon = GUI::Icon::default_icon("app-mouse");
@@ -34,6 +36,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     auto window = TRY(GUI::SettingsWindow::create("Mouse Settings", GUI::SettingsWindow::ShowDefaultsButton::Yes));
     (void)TRY(window->add_tab<MouseWidget>("Mouse", "mouse"));
     (void)TRY(window->add_tab<ThemeWidget>("Cursor Theme", "cursor-theme"));
+    (void)TRY(window->add_tab<HighlightWidget>("Cursor Highlight", "cursor-highlight"));
+
     window->set_icon(app_icon.bitmap_for_size(16));
     window->set_active_tab(selected_tab);