SystemMonitor: Add tab with detailed state to process properties window

This is done using a wrapper model that transforms all the information
about a single process in the ProcessModel and turns it into a 2-column
table model with only that process in it.

Userland/Applications/SystemMonitor/CMakeLists.txt

@@ -9,6 +9,7 @@ set(SOURCES
     ProcessMemoryMapWidget.cpp
     ProcessModel.cpp
     ProcessUnveiledPathsWidget.cpp
+    ProcessStateWidget.cpp
     ThreadStackWidget.cpp
 )
 

Userland/Applications/SystemMonitor/ProcessStateWidget.cpp

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2021, 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 "ProcessStateWidget.h"
+#include "ProcessModel.h"
+#include <LibCore/Timer.h>
+#include <LibGUI/BoxLayout.h>
+#include <LibGUI/HeaderView.h>
+#include <LibGUI/Painter.h>
+#include <LibGUI/SortingProxyModel.h>
+#include <LibGUI/TableView.h>
+#include <LibGfx/FontDatabase.h>
+#include <LibGfx/Palette.h>
+
+class ProcessStateModel final
+    : public GUI::Model
+    , public GUI::ModelClient {
+public:
+    explicit ProcessStateModel(ProcessModel& target, pid_t pid)
+        : m_target(target)
+        , m_pid(pid)
+    {
+        refresh();
+    }
+    virtual ~ProcessStateModel() override { }
+
+    virtual int row_count(const GUI::ModelIndex& = GUI::ModelIndex()) const override { return m_target.column_count({}); }
+    virtual int column_count(const GUI::ModelIndex& = GUI::ModelIndex()) const override { return 2; }
+
+    virtual GUI::Variant data(const GUI::ModelIndex& index, GUI::ModelRole role = GUI::ModelRole::Display) const override
+    {
+        if (role == GUI::ModelRole::Display) {
+            if (index.column() == 0) {
+                if (index.row() == ProcessModel::Column::Icon) {
+                    // NOTE: The icon column is nameless in ProcessModel, but we want it to have a name here.
+                    return "Icon";
+                }
+                return m_target.column_name(index.row());
+            }
+            return m_target_index.sibling_at_column(index.row()).data();
+        }
+
+        if (role == GUI::ModelRole::Font) {
+            if (index.column() == 0) {
+                return Gfx::FontDatabase::default_bold_font();
+            }
+        }
+
+        return {};
+    }
+
+    virtual void update() override
+    {
+        did_update(GUI::Model::DontInvalidateIndexes);
+    }
+
+    virtual void model_did_update([[maybe_unused]] unsigned flags) override
+    {
+        refresh();
+    }
+
+    void refresh()
+    {
+        m_target_index = {};
+        for (int row = 0; row < m_target.row_count({}); ++row) {
+            auto index = m_target.index(row, ProcessModel::Column::PID);
+            if (index.data().to_i32() == m_pid) {
+                m_target_index = index;
+                break;
+            }
+        }
+        update();
+    }
+
+private:
+    ProcessModel& m_target;
+    GUI::ModelIndex m_target_index;
+    pid_t m_pid { -1 };
+};
+
+ProcessStateWidget::ProcessStateWidget(pid_t pid)
+{
+    set_layout<GUI::VerticalBoxLayout>();
+    layout()->set_margins({ 4, 4, 4, 4 });
+    m_table_view = add<GUI::TableView>();
+    m_table_view->column_header().set_visible(false);
+    m_table_view->column_header().set_section_size(0, 90);
+    m_table_view->set_model(adopt(*new ProcessStateModel(ProcessModel::the(), pid)));
+}
+
+ProcessStateWidget::~ProcessStateWidget()
+{
+}

Userland/Applications/SystemMonitor/ProcessStateWidget.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2021, 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 <LibGUI/Widget.h>
+
+class ProcessStateWidget final : public GUI::Widget {
+    C_OBJECT(ProcessStateWidget);
+
+public:
+    virtual ~ProcessStateWidget() override;
+
+private:
+    explicit ProcessStateWidget(pid_t);
+    RefPtr<GUI::TableView> m_table_view;
+};

Userland/Applications/SystemMonitor/main.cpp

@@ -32,6 +32,7 @@
 #include "ProcessFileDescriptorMapWidget.h"
 #include "ProcessMemoryMapWidget.h"
 #include "ProcessModel.h"
+#include "ProcessStateWidget.h"
 #include "ProcessUnveiledPathsWidget.h"
 #include "ThreadStackWidget.h"
 #include <AK/NumberFormat.h>
@@ -472,6 +473,7 @@ NonnullRefPtr<GUI::Window> build_process_window(pid_t pid)
     auto& unavailable_process_widget = widget_stack.add<UnavailableProcessWidget>(String::formatted("Unable to access PID {}", pid));
 
     auto& process_tab_widget = widget_stack.add<GUI::TabWidget>();
+    process_tab_widget.add_tab<ProcessStateWidget>("State", pid);
     auto& memory_map_widget = process_tab_widget.add_tab<ProcessMemoryMapWidget>("Memory map");
     auto& open_files_widget = process_tab_widget.add_tab<ProcessFileDescriptorMapWidget>("Open files");
     auto& unveiled_paths_widget = process_tab_widget.add_tab<ProcessUnveiledPathsWidget>("Unveiled paths");