98 lines
3.0 KiB
C++
98 lines
3.0 KiB
C++
#pragma once
|
|
|
|
#include "common.hpp"
|
|
#include "events/signal_fwd.hpp"
|
|
#include "events/signal_receiver.hpp"
|
|
#include "events/types.hpp"
|
|
#include "x11/extensions/fwd.hpp"
|
|
#include "x11/types.hpp"
|
|
|
|
POLYBAR_NS
|
|
|
|
class logger;
|
|
|
|
namespace cairo {
|
|
class surface;
|
|
class xcb_surface;
|
|
}
|
|
|
|
/**
|
|
* \brief Class to keep track of the desktop background used to support pseudo-transparency
|
|
*
|
|
* For pseudo-transparency that bar needs access to the desktop background.
|
|
* We only need to store the slice of the background image which is covered by the bar window,
|
|
* so this class takes a rectangle that limits what part of the background is stored.
|
|
*/
|
|
class background_manager : public signal_receiver<SIGN_PRIORITY_SCREEN, signals::ui::update_geometry>,
|
|
public xpp::event::sink<evt::property_notify>
|
|
{
|
|
public:
|
|
using make_type = background_manager&;
|
|
static make_type make();
|
|
|
|
/**
|
|
* Initializes a new background_manager that by default does not observe anything.
|
|
*
|
|
* To observe a slice of the background you need to call background_manager::activate.
|
|
*/
|
|
explicit background_manager(connection& conn, signal_emitter& sig, const logger& log);
|
|
~background_manager();
|
|
|
|
/**
|
|
* Starts observing a rectangular slice of the desktop background.
|
|
*
|
|
* After calling this function, you can obtain the current slice of the desktop background
|
|
* with background_manager::get_surface. Whenever the background slice changes (for example,
|
|
* due to bar position changes or because the user changed the desktop background) the class
|
|
* emits a signals::ui::update_background event.
|
|
*
|
|
* \param window This should be set to the bar window.
|
|
* \param rect Slice of the background to observe (coordinates relative to window).
|
|
* Typically set to the outer area of the bar.
|
|
*/
|
|
void activate(xcb_window_t window, xcb_rectangle_t rect);
|
|
|
|
|
|
/**
|
|
* Stops observing the desktop background and frees all resources.
|
|
*/
|
|
void deactivate();
|
|
|
|
/**
|
|
* Retrieve the current desktop background slice.
|
|
*
|
|
* This function returns a slice of the desktop background that has the size of the rectangle
|
|
* given to background_manager::activate. As the slice is cached by the manager, this function
|
|
* is fast.
|
|
*/
|
|
cairo::surface* get_surface() const;
|
|
|
|
void handle(const evt::property_notify& evt);
|
|
bool on(const signals::ui::update_geometry&);
|
|
private:
|
|
// references to standard components
|
|
connection& m_connection;
|
|
signal_emitter& m_sig;
|
|
const logger& m_log;
|
|
|
|
// these are set by activate
|
|
xcb_window_t m_window;
|
|
xcb_rectangle_t m_rect{0, 0, 0U, 0U};
|
|
|
|
// required values for fetching the root window's background
|
|
xcb_visualtype_t* m_visual{nullptr};
|
|
xcb_gcontext_t m_gcontext{XCB_NONE};
|
|
xcb_pixmap_t m_pixmap{XCB_NONE};
|
|
unique_ptr<cairo::xcb_surface> m_surface;
|
|
|
|
// true if we are currently attached as a listener for desktop background changes
|
|
bool m_attached{false};
|
|
|
|
void allocate_resources();
|
|
void free_resources();
|
|
void fetch_root_pixmap();
|
|
|
|
};
|
|
|
|
POLYBAR_NS_END
|