Services: Move to Userland/Services/

Userland/Services/Taskbar/CMakeLists.txt

@@ -0,0 +1,9 @@
+set(SOURCES
+    main.cpp
+    TaskbarButton.cpp
+    TaskbarWindow.cpp
+    WindowList.cpp
+)
+
+serenity_bin(Taskbar)
+target_link_libraries(Taskbar LibGUI LibDesktop)

Userland/Services/Taskbar/TaskbarButton.cpp

@@ -0,0 +1,162 @@
+/*
+ * 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 "TaskbarButton.h"
+#include "WindowList.h"
+#include <LibGUI/Action.h>
+#include <LibGUI/Painter.h>
+#include <LibGUI/WindowServerConnection.h>
+#include <LibGfx/Font.h>
+#include <LibGfx/FontDatabase.h>
+#include <LibGfx/Palette.h>
+#include <LibGfx/StylePainter.h>
+
+TaskbarButton::TaskbarButton(const WindowIdentifier& identifier)
+    : m_identifier(identifier)
+{
+}
+
+TaskbarButton::~TaskbarButton()
+{
+}
+
+void TaskbarButton::context_menu_event(GUI::ContextMenuEvent&)
+{
+    GUI::WindowServerConnection::the().post_message(Messages::WindowServer::WM_PopupWindowMenu(m_identifier.client_id(), m_identifier.window_id(), screen_relative_rect().location()));
+}
+
+void TaskbarButton::update_taskbar_rect()
+{
+    GUI::WindowServerConnection::the().post_message(
+        Messages::WindowServer::WM_SetWindowTaskbarRect(
+            m_identifier.client_id(),
+            m_identifier.window_id(),
+            screen_relative_rect()));
+}
+
+void TaskbarButton::clear_taskbar_rect()
+{
+    GUI::WindowServerConnection::the().post_message(
+        Messages::WindowServer::WM_SetWindowTaskbarRect(
+            m_identifier.client_id(),
+            m_identifier.window_id(),
+            {}));
+}
+
+void TaskbarButton::resize_event(GUI::ResizeEvent& event)
+{
+    update_taskbar_rect();
+    return GUI::Button::resize_event(event);
+}
+
+static void paint_custom_progress_bar(GUI::Painter& painter, const Gfx::IntRect& rect, const Gfx::IntRect& text_rect, const Palette& palette, int min, int max, int value, const StringView& text, const Gfx::Font& font, Gfx::TextAlignment text_alignment)
+{
+    float range_size = max - min;
+    float progress = (value - min) / range_size;
+    float progress_width = progress * rect.width();
+
+    Gfx::IntRect progress_rect { rect.x(), rect.y(), (int)progress_width, rect.height() };
+
+    {
+        Gfx::PainterStateSaver saver(painter);
+        painter.add_clip_rect(progress_rect);
+
+        Color start_color = palette.active_window_border1();
+        Color end_color = palette.active_window_border2();
+        painter.fill_rect_with_gradient(rect, start_color, end_color);
+
+        if (!text.is_null()) {
+            painter.draw_text(text_rect.translated(1, 1), text, font, text_alignment, palette.base_text(), Gfx::TextElision::Right);
+            painter.draw_text(text_rect, text, font, text_alignment, palette.base_text().inverted(), Gfx::TextElision::Right);
+        }
+    }
+
+    Gfx::IntRect hole_rect { (int)progress_width, 0, (int)(rect.width() - progress_width), rect.height() };
+    hole_rect.move_by(rect.location());
+    hole_rect.set_right_without_resize(rect.right());
+    Gfx::PainterStateSaver saver(painter);
+    painter.add_clip_rect(hole_rect);
+    if (!text.is_null())
+        painter.draw_text(text_rect, text, font, text_alignment, palette.base_text(), Gfx::TextElision::Right);
+}
+
+void TaskbarButton::paint_event(GUI::PaintEvent& event)
+{
+    ASSERT(icon());
+    auto& icon = *this->icon();
+    auto& font = is_checked() ? Gfx::FontDatabase::default_bold_font() : this->font();
+    auto& window = WindowList::the().ensure_window(m_identifier);
+
+    GUI::Painter painter(*this);
+    painter.add_clip_rect(event.rect());
+
+    Gfx::StylePainter::paint_button(painter, rect(), palette(), button_style(), is_being_pressed(), is_hovered(), is_checked(), is_enabled());
+
+    if (text().is_empty())
+        return;
+
+    bool has_progress = window.progress() >= 0 && window.progress() <= 100;
+
+    auto content_rect = rect().shrunken(8, 2);
+    auto icon_location = content_rect.center().translated(-(icon.width() / 2), -(icon.height() / 2));
+    if (!text().is_empty())
+        icon_location.set_x(content_rect.x());
+
+    if (!text().is_empty()) {
+        content_rect.move_by(icon.width() + 4, 0);
+        content_rect.set_width(content_rect.width() - icon.width() - 4);
+    }
+
+    Gfx::IntRect text_rect { 0, 0, font.width(text()), font.glyph_height() };
+    if (text_rect.width() > content_rect.width())
+        text_rect.set_width(content_rect.width());
+    text_rect.align_within(content_rect, text_alignment());
+
+    if (is_being_pressed() || is_checked()) {
+        text_rect.move_by(1, 1);
+        icon_location.move_by(1, 1);
+    }
+
+    if (has_progress) {
+        auto adjusted_rect = rect().shrunken(4, 4);
+        if (is_being_pressed() || is_checked()) {
+            adjusted_rect.set_height(adjusted_rect.height() + 1);
+        }
+        paint_custom_progress_bar(painter, adjusted_rect, text_rect, palette(), 0, 100, window.progress(), text(), font, text_alignment());
+    }
+
+    if (is_enabled()) {
+        if (is_hovered())
+            painter.blit_brightened(icon_location, icon, icon.rect());
+        else
+            painter.blit(icon_location, icon, icon.rect());
+    } else {
+        painter.blit_disabled(icon_location, icon, icon.rect(), palette());
+    }
+
+    if (!has_progress)
+        paint_text(painter, text_rect, font, text_alignment());
+}

Userland/Services/Taskbar/TaskbarButton.h

@@ -0,0 +1,48 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include "WindowIdentifier.h"
+#include <LibGUI/Button.h>
+
+class TaskbarButton final : public GUI::Button {
+    C_OBJECT(TaskbarButton)
+public:
+    virtual ~TaskbarButton() override;
+
+    void update_taskbar_rect();
+    void clear_taskbar_rect();
+
+private:
+    explicit TaskbarButton(const WindowIdentifier&);
+
+    virtual void context_menu_event(GUI::ContextMenuEvent&) override;
+    virtual void resize_event(GUI::ResizeEvent&) override;
+    virtual void paint_event(GUI::PaintEvent&) override;
+
+    WindowIdentifier m_identifier;
+};

Userland/Services/Taskbar/TaskbarWindow.cpp

@@ -0,0 +1,314 @@
+/*
+ * 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 "TaskbarWindow.h"
+#include "TaskbarButton.h"
+#include <AK/SharedBuffer.h>
+#include <LibCore/ConfigFile.h>
+#include <LibCore/StandardPaths.h>
+#include <LibDesktop/AppFile.h>
+#include <LibGUI/BoxLayout.h>
+#include <LibGUI/Button.h>
+#include <LibGUI/Desktop.h>
+#include <LibGUI/Frame.h>
+#include <LibGUI/Icon.h>
+#include <LibGUI/Painter.h>
+#include <LibGUI/Window.h>
+#include <LibGUI/WindowServerConnection.h>
+#include <LibGfx/Palette.h>
+#include <serenity.h>
+#include <stdio.h>
+
+//#define EVENT_DEBUG
+
+class TaskbarWidget final : public GUI::Widget {
+    C_OBJECT(TaskbarWidget);
+
+public:
+    virtual ~TaskbarWidget() override { }
+
+private:
+    TaskbarWidget() { }
+
+    virtual void paint_event(GUI::PaintEvent& event) override
+    {
+        GUI::Painter painter(*this);
+        painter.add_clip_rect(event.rect());
+        painter.fill_rect(rect(), palette().button());
+        painter.draw_line({ 0, 1 }, { width() - 1, 1 }, palette().threed_highlight());
+    }
+
+    virtual void did_layout() override
+    {
+        WindowList::the().for_each_window([&](auto& window) {
+            if (auto* button = window.button())
+                static_cast<TaskbarButton*>(button)->update_taskbar_rect();
+        });
+    }
+};
+
+TaskbarWindow::TaskbarWindow()
+{
+    set_window_type(GUI::WindowType::Taskbar);
+    set_title("Taskbar");
+
+    on_screen_rect_change(GUI::Desktop::the().rect());
+
+    GUI::Desktop::the().on_rect_change = [this](const Gfx::IntRect& rect) { on_screen_rect_change(rect); };
+
+    auto& widget = set_main_widget<TaskbarWidget>();
+    widget.set_layout<GUI::HorizontalBoxLayout>();
+    widget.layout()->set_margins({ 3, 2, 3, 2 });
+    widget.layout()->set_spacing(3);
+
+    m_default_icon = Gfx::Bitmap::load_from_file("/res/icons/16x16/window.png");
+
+    create_quick_launch_bar();
+}
+
+TaskbarWindow::~TaskbarWindow()
+{
+}
+
+void TaskbarWindow::create_quick_launch_bar()
+{
+    auto& quick_launch_bar = main_widget()->add<GUI::Frame>();
+    quick_launch_bar.set_layout<GUI::HorizontalBoxLayout>();
+    quick_launch_bar.layout()->set_spacing(0);
+    quick_launch_bar.layout()->set_margins({ 3, 0, 3, 0 });
+    quick_launch_bar.set_frame_thickness(0);
+
+    int total_width = 6;
+    bool first = true;
+
+    auto config = Core::ConfigFile::get_for_app("Taskbar");
+    constexpr const char* quick_launch = "QuickLaunch";
+
+    // FIXME: Core::ConfigFile does not keep the order of the entries.
+    for (auto& name : config->keys(quick_launch)) {
+        auto af_name = config->read_entry(quick_launch, name);
+        auto af_path = String::formatted("{}/{}", Desktop::AppFile::APP_FILES_DIRECTORY, af_name);
+        auto af = Desktop::AppFile::open(af_path);
+        if (!af->is_valid())
+            continue;
+        auto app_executable = af->executable();
+        const int button_size = 24;
+        auto& button = quick_launch_bar.add<GUI::Button>();
+        button.set_fixed_size(button_size, button_size);
+        button.set_button_style(Gfx::ButtonStyle::CoolBar);
+        button.set_icon(af->icon().bitmap_for_size(16));
+        button.set_tooltip(af->name());
+        button.on_click = [app_executable](auto) {
+            pid_t pid = fork();
+            if (pid < 0) {
+                perror("fork");
+            } else if (pid == 0) {
+                if (chdir(Core::StandardPaths::home_directory().characters()) < 0) {
+                    perror("chdir");
+                    exit(1);
+                }
+                execl(app_executable.characters(), app_executable.characters(), nullptr);
+                perror("execl");
+                ASSERT_NOT_REACHED();
+            } else {
+                if (disown(pid) < 0)
+                    perror("disown");
+            }
+        };
+
+        if (!first)
+            total_width += quick_launch_bar.layout()->spacing();
+        first = false;
+        total_width += button_size;
+    }
+
+    quick_launch_bar.set_fixed_size(total_width, 24);
+}
+
+void TaskbarWindow::on_screen_rect_change(const Gfx::IntRect& rect)
+{
+    Gfx::IntRect new_rect { rect.x(), rect.bottom() - taskbar_height() + 1, rect.width(), taskbar_height() };
+    set_rect(new_rect);
+}
+
+NonnullRefPtr<GUI::Button> TaskbarWindow::create_button(const WindowIdentifier& identifier)
+{
+    auto& button = main_widget()->add<TaskbarButton>(identifier);
+    button.set_min_size(20, 23);
+    button.set_max_size(140, 23);
+    button.set_text_alignment(Gfx::TextAlignment::CenterLeft);
+    button.set_icon(*m_default_icon);
+    return button;
+}
+
+static bool should_include_window(GUI::WindowType window_type, bool is_frameless)
+{
+    return window_type == GUI::WindowType::Normal && !is_frameless;
+}
+
+void TaskbarWindow::add_window_button(::Window& window, const WindowIdentifier& identifier)
+{
+    if (window.button())
+        return;
+    window.set_button(create_button(identifier));
+    auto* button = window.button();
+    button->on_click = [window = &window, identifier, button](auto) {
+        // We need to look at the button's checked state here to figure
+        // out if the application is active or not. That's because this
+        // button's window may not actually be active when a modal window
+        // is displayed, in which case window->is_active() would return
+        // false because window is the modal window's owner (which is not
+        // active)
+        if (window->is_minimized() || !button->is_checked()) {
+            GUI::WindowServerConnection::the().post_message(Messages::WindowServer::WM_SetActiveWindow(identifier.client_id(), identifier.window_id()));
+        } else {
+            GUI::WindowServerConnection::the().post_message(Messages::WindowServer::WM_SetWindowMinimized(identifier.client_id(), identifier.window_id(), true));
+        }
+    };
+}
+
+void TaskbarWindow::remove_window_button(::Window& window, bool was_removed)
+{
+    auto* button = window.button();
+    if (!button)
+        return;
+    if (!was_removed)
+        static_cast<TaskbarButton*>(button)->clear_taskbar_rect();
+    window.set_button(nullptr);
+    button->remove_from_parent();
+}
+
+void TaskbarWindow::update_window_button(::Window& window, bool show_as_active)
+{
+    auto* button = window.button();
+    if (!button)
+        return;
+    button->set_text(window.title());
+    button->set_checked(show_as_active);
+}
+
+::Window* TaskbarWindow::find_window_owner(::Window& window) const
+{
+    if (!window.is_modal())
+        return &window;
+
+    ::Window* parent = nullptr;
+    auto* current_window = &window;
+    while (current_window) {
+        parent = WindowList::the().find_parent(*current_window);
+        if (!parent || !parent->is_modal())
+            break;
+        current_window = parent;
+    }
+    return parent;
+}
+
+void TaskbarWindow::wm_event(GUI::WMEvent& event)
+{
+    WindowIdentifier identifier { event.client_id(), event.window_id() };
+    switch (event.type()) {
+    case GUI::Event::WM_WindowRemoved: {
+#ifdef EVENT_DEBUG
+        auto& removed_event = static_cast<GUI::WMWindowRemovedEvent&>(event);
+        dbgln("WM_WindowRemoved: client_id={}, window_id={}",
+            removed_event.client_id(),
+            removed_event.window_id());
+#endif
+        if (auto* window = WindowList::the().window(identifier))
+            remove_window_button(*window, true);
+        WindowList::the().remove_window(identifier);
+        update();
+        break;
+    }
+    case GUI::Event::WM_WindowRectChanged: {
+#ifdef EVENT_DEBUG
+        auto& changed_event = static_cast<GUI::WMWindowRectChangedEvent&>(event);
+        dbgln("WM_WindowRectChanged: client_id={}, window_id={}, rect={}",
+            changed_event.client_id(),
+            changed_event.window_id(),
+            changed_event.rect());
+#endif
+        break;
+    }
+
+    case GUI::Event::WM_WindowIconBitmapChanged: {
+        auto& changed_event = static_cast<GUI::WMWindowIconBitmapChangedEvent&>(event);
+#ifdef EVENT_DEBUG
+        dbgln("WM_WindowIconBitmapChanged: client_id={}, window_id={}, icon_buffer_id={}",
+            changed_event.client_id(),
+            changed_event.window_id(),
+            changed_event.icon_buffer_id());
+#endif
+        if (auto* window = WindowList::the().window(identifier)) {
+            auto buffer = SharedBuffer::create_from_shbuf_id(changed_event.icon_buffer_id());
+            ASSERT(buffer);
+            if (window->button())
+                window->button()->set_icon(Gfx::Bitmap::create_with_shared_buffer(Gfx::BitmapFormat::RGBA32, *buffer, changed_event.icon_size()));
+        }
+        break;
+    }
+
+    case GUI::Event::WM_WindowStateChanged: {
+        auto& changed_event = static_cast<GUI::WMWindowStateChangedEvent&>(event);
+#ifdef EVENT_DEBUG
+        dbgln("WM_WindowStateChanged: client_id={}, window_id={}, title={}, rect={}, is_active={}, is_minimized={}",
+            changed_event.client_id(),
+            changed_event.window_id(),
+            changed_event.title(),
+            changed_event.rect(),
+            changed_event.is_active(),
+            changed_event.is_minimized());
+#endif
+        if (!should_include_window(changed_event.window_type(), changed_event.is_frameless()))
+            break;
+        auto& window = WindowList::the().ensure_window(identifier);
+        window.set_parent_identifier({ changed_event.parent_client_id(), changed_event.parent_window_id() });
+        if (!window.is_modal())
+            add_window_button(window, identifier);
+        else
+            remove_window_button(window, false);
+        window.set_title(changed_event.title());
+        window.set_rect(changed_event.rect());
+        window.set_modal(changed_event.is_modal());
+        window.set_active(changed_event.is_active());
+        window.set_minimized(changed_event.is_minimized());
+        window.set_progress(changed_event.progress());
+
+        auto* window_owner = find_window_owner(window);
+        if (window_owner == &window) {
+            update_window_button(window, window.is_active());
+        } else if (window_owner) {
+            // check the window owner's button if the modal's window button
+            // would have been checked
+            ASSERT(window.is_modal());
+            update_window_button(*window_owner, window.is_active());
+        }
+        break;
+    }
+    default:
+        break;
+    }
+}

Userland/Services/Taskbar/TaskbarWindow.h

@@ -0,0 +1,53 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include "WindowList.h"
+#include <LibGUI/Widget.h>
+#include <LibGUI/Window.h>
+
+class TaskbarWindow final : public GUI::Window {
+    C_OBJECT(TaskbarWindow)
+public:
+    TaskbarWindow();
+    virtual ~TaskbarWindow() override;
+
+    int taskbar_height() const { return 28; }
+
+private:
+    void create_quick_launch_bar();
+    void on_screen_rect_change(const Gfx::IntRect&);
+    NonnullRefPtr<GUI::Button> create_button(const WindowIdentifier&);
+    void add_window_button(::Window&, const WindowIdentifier&);
+    void remove_window_button(::Window&, bool);
+    void update_window_button(::Window&, bool);
+    ::Window* find_window_owner(::Window&) const;
+
+    virtual void wm_event(GUI::WMEvent&) override;
+
+    RefPtr<Gfx::Bitmap> m_default_icon;
+};

Userland/Services/Taskbar/WindowIdentifier.h

@@ -0,0 +1,63 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <AK/Traits.h>
+
+class WindowIdentifier {
+public:
+    WindowIdentifier() = default;
+    WindowIdentifier(int client_id, int window_id)
+        : m_client_id(client_id)
+        , m_window_id(window_id)
+    {
+    }
+
+    int client_id() const { return m_client_id; }
+    int window_id() const { return m_window_id; }
+
+    bool operator==(const WindowIdentifier& other) const
+    {
+        return m_client_id == other.m_client_id && m_window_id == other.m_window_id;
+    }
+
+    bool is_valid() const
+    {
+        return m_client_id != -1 && m_window_id != -1;
+    }
+
+private:
+    int m_client_id { -1 };
+    int m_window_id { -1 };
+};
+
+namespace AK {
+template<>
+struct Traits<WindowIdentifier> : public GenericTraits<WindowIdentifier> {
+    static unsigned hash(const WindowIdentifier& w) { return pair_int_hash(w.client_id(), w.window_id()); }
+};
+}

Userland/Services/Taskbar/WindowList.cpp

@@ -0,0 +1,71 @@
+/*
+ * 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 "WindowList.h"
+
+WindowList& WindowList::the()
+{
+    static WindowList* s_the;
+    if (!s_the)
+        s_the = new WindowList;
+    return *s_the;
+}
+
+Window* WindowList::find_parent(const Window& window)
+{
+    if (!window.parent_identifier().is_valid())
+        return nullptr;
+    for (auto& it : m_windows) {
+        auto& w = *it.value;
+        if (w.identifier() == window.parent_identifier())
+            return &w;
+    }
+    return nullptr;
+}
+
+Window* WindowList::window(const WindowIdentifier& identifier)
+{
+    auto it = m_windows.find(identifier);
+    if (it != m_windows.end())
+        return it->value;
+    return nullptr;
+}
+
+Window& WindowList::ensure_window(const WindowIdentifier& identifier)
+{
+    auto it = m_windows.find(identifier);
+    if (it != m_windows.end())
+        return *it->value;
+    auto window = make<Window>(identifier);
+    auto& window_ref = *window;
+    m_windows.set(identifier, move(window));
+    return window_ref;
+}
+
+void WindowList::remove_window(const WindowIdentifier& identifier)
+{
+    m_windows.remove(identifier);
+}

Userland/Services/Taskbar/WindowList.h

@@ -0,0 +1,115 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include "WindowIdentifier.h"
+#include <AK/HashMap.h>
+#include <AK/String.h>
+#include <LibGUI/Button.h>
+#include <LibGfx/Rect.h>
+
+class Window {
+public:
+    explicit Window(const WindowIdentifier& identifier)
+        : m_identifier(identifier)
+    {
+    }
+
+    ~Window()
+    {
+        if (m_button)
+            m_button->remove_from_parent();
+    }
+
+    const WindowIdentifier& identifier() const { return m_identifier; }
+
+    void set_parent_identifier(const WindowIdentifier& parent_identifier) { m_parent_identifier = parent_identifier; }
+    const WindowIdentifier& parent_identifier() const { return m_parent_identifier; }
+
+    String title() const { return m_title; }
+    void set_title(const String& title) { m_title = title; }
+
+    Gfx::IntRect rect() const { return m_rect; }
+    void set_rect(const Gfx::IntRect& rect) { m_rect = rect; }
+
+    GUI::Button* button() { return m_button; }
+    void set_button(GUI::Button* button) { m_button = button; }
+
+    void set_active(bool active) { m_active = active; }
+    bool is_active() const { return m_active; }
+
+    void set_minimized(bool minimized) { m_minimized = minimized; }
+    bool is_minimized() const { return m_minimized; }
+
+    void set_modal(bool modal) { m_modal = modal; }
+    bool is_modal() const { return m_modal; }
+
+    void set_progress(int progress)
+    {
+        if (m_progress == progress)
+            return;
+        m_progress = progress;
+        if (m_button)
+            m_button->update();
+    }
+
+    int progress() const { return m_progress; }
+
+    const Gfx::Bitmap* icon() const { return m_icon.ptr(); }
+
+private:
+    WindowIdentifier m_identifier;
+    WindowIdentifier m_parent_identifier;
+    String m_title;
+    Gfx::IntRect m_rect;
+    RefPtr<GUI::Button> m_button;
+    RefPtr<Gfx::Bitmap> m_icon;
+    bool m_active { false };
+    bool m_minimized { false };
+    bool m_modal { false };
+    int m_progress { -1 };
+};
+
+class WindowList {
+public:
+    static WindowList& the();
+
+    template<typename Callback>
+    void for_each_window(Callback callback)
+    {
+        for (auto& it : m_windows)
+            callback(*it.value);
+    }
+
+    Window* find_parent(const Window&);
+    Window* window(const WindowIdentifier&);
+    Window& ensure_window(const WindowIdentifier&);
+    void remove_window(const WindowIdentifier&);
+
+private:
+    HashMap<WindowIdentifier, NonnullOwnPtr<Window>> m_windows;
+};

Userland/Services/Taskbar/main.cpp

@@ -0,0 +1,57 @@
+/*
+ * 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 "TaskbarWindow.h"
+#include <LibCore/EventLoop.h>
+#include <LibGUI/Application.h>
+#include <signal.h>
+#include <stdio.h>
+#include <sys/wait.h>
+
+int main(int argc, char** argv)
+{
+    if (pledge("stdio shared_buffer accept proc exec rpath unix cpath fattr sigaction", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    auto app = GUI::Application::construct(argc, argv);
+    app->event_loop().register_signal(SIGCHLD, [](int) {
+        // Wait all available children
+        while (waitpid(-1, nullptr, WNOHANG) > 0)
+            ;
+    });
+
+    if (pledge("stdio shared_buffer accept proc exec rpath", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    TaskbarWindow window;
+    window.show();
+
+    return app->exec();
+}