mirror of https://github.com/polybar/polybar.git
136 lines
3.6 KiB
C++
136 lines
3.6 KiB
C++
#include "modules/xwindow.hpp"
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#include "drawtypes/label.hpp"
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#include "modules/meta/base.inl"
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#include "x11/atoms.hpp"
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#include "x11/connection.hpp"
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POLYBAR_NS
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namespace modules {
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template class module<xwindow_module>;
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/**
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* Wrapper used to update the event mask of the
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* currently active to enable title tracking
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*/
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active_window::active_window(xcb_connection_t* conn, xcb_window_t win) : m_connection(conn), m_window(win) {
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if (m_window != XCB_NONE) {
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const unsigned int mask{XCB_EVENT_MASK_PROPERTY_CHANGE};
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xcb_change_window_attributes(m_connection, m_window, XCB_CW_EVENT_MASK, &mask);
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}
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}
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/**
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* Deconstruct window object
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*/
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active_window::~active_window() {
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if (m_window != XCB_NONE) {
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const unsigned int mask{XCB_EVENT_MASK_NO_EVENT};
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xcb_change_window_attributes(m_connection, m_window, XCB_CW_EVENT_MASK, &mask);
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}
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}
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/**
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* Check if current window matches passed value
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*/
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bool active_window::match(const xcb_window_t win) const {
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return m_window == win;
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}
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/**
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* Get the title by returning the first non-empty value of:
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* _NET_WM_NAME
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* _NET_WM_VISIBLE_NAME
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* WM_NAME
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*/
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string active_window::title() const {
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string title;
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if (!(title = ewmh_util::get_wm_name(m_window)).empty()) {
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return title;
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} else if (!(title = ewmh_util::get_visible_name(m_window)).empty()) {
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return title;
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} else if (!(title = icccm_util::get_wm_name(m_connection, m_window)).empty()) {
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return title;
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} else {
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return "";
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}
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}
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/**
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* Construct module
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*/
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xwindow_module::xwindow_module(const bar_settings& bar, string name_)
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: static_module<xwindow_module>(bar, move(name_)), m_connection(connection::make()) {
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// Initialize ewmh atoms
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ewmh_util::initialize();
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// Check if the WM supports _NET_ACTIVE_WINDOW
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if (!ewmh_util::supports(_NET_ACTIVE_WINDOW)) {
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throw module_error("The WM does not list _NET_ACTIVE_WINDOW as a supported hint");
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}
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// Add formats and elements
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m_formatter->add(DEFAULT_FORMAT, TAG_LABEL, {TAG_LABEL});
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if (m_formatter->has(TAG_LABEL)) {
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m_statelabels.emplace(state::ACTIVE, load_optional_label(m_conf, name(), "label", "%title%"));
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m_statelabels.emplace(state::EMPTY, load_optional_label(m_conf, name(), "label-empty", ""));
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}
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}
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/**
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* Handler for XCB_PROPERTY_NOTIFY events
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*/
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void xwindow_module::handle(const evt::property_notify& evt) {
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if (evt->atom == _NET_ACTIVE_WINDOW) {
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update(true);
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} else if (evt->atom == _NET_CURRENT_DESKTOP) {
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update(true);
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} else if (evt->atom == _NET_WM_NAME || evt->atom == _NET_WM_VISIBLE_NAME || evt->atom == WM_NAME) {
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update();
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} else {
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return;
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}
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broadcast();
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}
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/**
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* Update the currently active window and query its title
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*/
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void xwindow_module::update(bool force) {
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xcb_window_t win;
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if (force) {
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m_active.reset();
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}
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if (!m_active && (win = ewmh_util::get_active_window()) != XCB_NONE) {
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m_active = make_unique<active_window>(m_connection, win);
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}
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if (m_active) {
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m_label = m_statelabels.at(state::ACTIVE)->clone();
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m_label->reset_tokens();
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m_label->replace_token("%title%", m_active->title());
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} else {
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m_label = m_statelabels.at(state::EMPTY)->clone();
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}
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}
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/**
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* Output content as defined in the config
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*/
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bool xwindow_module::build(builder* builder, const string& tag) const {
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if (tag == TAG_LABEL && m_label) {
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builder->node(m_label);
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return true;
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}
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return false;
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}
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} // namespace modules
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POLYBAR_NS_END
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