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https://github.com/RGBCube/serenity
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ProcessManager: Start working on a graphical process manager.
I need a table view widget for this thing, so I'm also using this to prototype a model/view thingy.
This commit is contained in:
Andreas Kling
parent
dda9b9ab1b
commit
166aadc4e1
14 changed files with 467 additions and 1 deletions
284
Applications/ProcessManager/ProcessView.cpp
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284
Applications/ProcessManager/ProcessView.cpp
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <AK/FileSystemPath.h>
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#include <AK/HashMap.h>
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#include <SharedGraphics/GraphicsBitmap.h>
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#include <SharedGraphics/Painter.h>
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#include <LibGUI/GScrollBar.h>
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#include <LibGUI/GTableModel.h>
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#include "ProcessView.h"
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static HashMap<unsigned, String>* s_usernames;
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class ProcessTableModel final : public GTableModel {
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public:
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ProcessTableModel()
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{
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}
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virtual ~ProcessTableModel() override { }
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virtual int row_count() const override { return m_processes.size(); }
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virtual int column_count() const override { return 3; }
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virtual String column_name(int column) const override
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{
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switch (column) {
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case 0: return "PID";
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case 1: return "State";
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case 2: return "Name";
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default: ASSERT_NOT_REACHED();
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}
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}
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virtual int column_width(int column) const override
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{
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switch (column) {
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case 0: return 30;
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case 1: return 80;
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case 2: return 100;
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default: ASSERT_NOT_REACHED();
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}
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}
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virtual GModelIndex selected_index() const override { return { m_selected_row, 0 }; }
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virtual void set_selected_index(GModelIndex index) override
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{
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if (index.row() >= 0 && index.row() < m_pids.size())
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m_selected_row = index.row();
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}
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virtual String data(int row, int column) const override
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{
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if (row < 0 || row >= row_count())
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return { };
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if (column < 0 || column >= column_count())
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return { };
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auto it = m_processes.find(m_pids[row]);
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auto& process = *(*it).value;
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switch (column) {
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case 0: return String::format("%d", process.current_state.pid);
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case 1: return process.current_state.state;
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case 2: return process.current_state.name;
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}
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ASSERT_NOT_REACHED();
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}
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virtual void update() override
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{
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FILE* fp = fopen("/proc/all", "r");
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if (!fp) {
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perror("failed to open /proc/all");
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exit(1);
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}
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HashTable<pid_t> live_pids;
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for (;;) {
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char buf[BUFSIZ];
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char* ptr = fgets(buf, sizeof(buf), fp);
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if (!ptr)
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break;
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auto parts = String(buf, Chomp).split(',');
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if (parts.size() < 17)
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break;
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bool ok;
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pid_t pid = parts[0].to_uint(ok);
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ASSERT(ok);
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unsigned nsched = parts[1].to_uint(ok);
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ASSERT(ok);
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ProcessState state;
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state.pid = pid;
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state.nsched = nsched;
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unsigned uid = parts[5].to_uint(ok);
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ASSERT(ok);
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//state.user = s_usernames->get(uid);
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state.user = String::format("%u", uid);
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state.priority = parts[16];
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state.state = parts[7];
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state.name = parts[11];
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state.linear = parts[12].to_uint(ok);
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ASSERT(ok);
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state.committed = parts[13].to_uint(ok);
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ASSERT(ok);
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{
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auto it = m_processes.find(pid);
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if (it == m_processes.end())
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m_processes.set(pid, make<Process>());
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}
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auto it = m_processes.find(pid);
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ASSERT(it != m_processes.end());
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(*it).value->previous_state = (*it).value->current_state;
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(*it).value->current_state = state;
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live_pids.set(pid);
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}
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int rc = fclose(fp);
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ASSERT(rc == 0);
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m_pids.clear();
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Vector<pid_t> pids_to_remove;
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for (auto& it : m_processes) {
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if (!live_pids.contains(it.key)) {
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pids_to_remove.append(it.key);
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continue;
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}
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m_pids.append(it.key);
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}
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for (auto pid : pids_to_remove)
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m_processes.remove(pid);
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}
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pid_t selected_pid() const
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{
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if (m_selected_row == -1)
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return -1;
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return m_pids[m_selected_row];
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}
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private:
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struct ProcessState {
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pid_t pid;
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unsigned nsched;
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String name;
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String state;
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String user;
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String priority;
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unsigned linear;
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unsigned committed;
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unsigned nsched_since_prev;
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float cpu_percent;
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};
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struct Process {
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ProcessState current_state;
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ProcessState previous_state;
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};
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HashMap<pid_t, OwnPtr<Process>> m_processes;
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Vector<pid_t> m_pids;
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int m_selected_row { -1 };
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};
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ProcessView::ProcessView(GWidget* parent)
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: GWidget(parent)
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{
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m_process_icon = GraphicsBitmap::load_from_file(GraphicsBitmap::Format::RGBA32, "/res/icons/gear16.rgb", { 16, 16 });
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m_scrollbar = new GScrollBar(Orientation::Vertical, this);
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m_scrollbar->set_step(4);
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m_scrollbar->set_big_step(30);
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m_scrollbar->on_change = [this] (int) {
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update();
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};
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m_model = make<ProcessTableModel>();
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start_timer(1000);
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reload();
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}
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ProcessView::~ProcessView()
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{
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}
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void ProcessView::timer_event(GTimerEvent&)
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{
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reload();
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}
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void ProcessView::resize_event(GResizeEvent& event)
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{
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m_scrollbar->set_relative_rect(event.size().width() - m_scrollbar->preferred_size().width(), 0, m_scrollbar->preferred_size().width(), event.size().height());
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}
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void ProcessView::reload()
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{
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m_model->update();
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int excess_height = max(0, (item_count() * item_height()) - height());
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m_scrollbar->set_range(0, excess_height);
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set_status_message(String::format("%d processes", item_count()));
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update();
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}
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Rect ProcessView::row_rect(int item_index) const
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{
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return { 0, header_height() + (item_index * item_height()), width(), item_height() };
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}
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void ProcessView::mousedown_event(GMouseEvent& event)
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{
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if (event.button() == GMouseButton::Left) {
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for (int i = 0; i < item_count(); ++i) {
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if (!row_rect(i).contains(event.position()))
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continue;
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m_model->set_selected_index({ i, 0 });
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update();
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}
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}
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}
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void ProcessView::paint_event(GPaintEvent&)
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{
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Painter painter(*this);
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int horizontal_padding = 5;
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int painted_item_index = 0;
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int x_offset = 0;
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for (int column_index = 0; column_index < m_model->column_count(); ++column_index) {
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Rect cell_rect(horizontal_padding + x_offset, 0, m_model->column_width(column_index), item_height());
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painter.draw_text(cell_rect, m_model->column_name(column_index), TextAlignment::CenterLeft, Color::Black);
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x_offset += m_model->column_width(column_index) + horizontal_padding;
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}
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painter.draw_line({ 0, 0 }, { width() - 1, 0 }, Color::White);
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painter.draw_line({ 0, header_height() - 1 }, { width() - 1, header_height() - 1 }, Color::DarkGray);
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int y_offset = header_height();
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for (int row_index = 0; row_index < m_model->row_count(); ++row_index) {
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int y = y_offset + painted_item_index * item_height();
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Color background_color;
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Color text_color;
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if (row_index == m_model->selected_index().row()) {
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background_color = Color::from_rgb(0x84351a);
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text_color = Color::White;
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} else {
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background_color = painted_item_index % 2 ? Color(210, 210, 210) : Color::White;
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text_color = Color::Black;
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}
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painter.fill_rect(row_rect(painted_item_index), background_color);
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int x_offset = 0;
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for (int column_index = 0; column_index < m_model->column_count(); ++column_index) {
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Rect cell_rect(horizontal_padding + x_offset, y, m_model->column_width(column_index), item_height());
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painter.draw_text(cell_rect, m_model->data(row_index, column_index), TextAlignment::CenterLeft, text_color);
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x_offset += m_model->column_width(column_index) + horizontal_padding;
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}
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++painted_item_index;
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};
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Rect unpainted_rect(0, painted_item_index * item_height(), width(), height());
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unpainted_rect.intersect(rect());
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painter.fill_rect(unpainted_rect, Color::White);
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}
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void ProcessView::set_status_message(String&& message)
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{
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if (on_status_message)
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on_status_message(move(message));
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}
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int ProcessView::item_count() const
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{
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return m_model->row_count();
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}
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pid_t ProcessView::selected_pid() const
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{
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return m_model->selected_pid();
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}
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