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#include "../include/WindowSelector.hpp"
#include "../include/WindowUtils.hpp"
#include <stdio.h>
#include <string.h>
#include <X11/extensions/shape.h>
#include <X11/cursorfont.h>
#include <X11/keysym.h>
namespace gsr {
static const int rectangle_border_size = 2;
static int max_int(int a, int b) {
return a >= b ? a : b;
}
static void set_region_rectangle(Display *dpy, Window window, int x, int y, int width, int height, int border_size) {
if(width < 0) {
x += width;
width = abs(width);
}
if(height < 0) {
y += height;
height = abs(height);
}
XRectangle rectangles[] = {
{
(short)max_int(0, x), (short)max_int(0, y),
(unsigned short)max_int(0, border_size), (unsigned short)max_int(0, height)
}, // Left
{
(short)max_int(0, x + width - border_size), (short)max_int(0, y),
(unsigned short)max_int(0, border_size), (unsigned short)max_int(0, height)
}, // Right
{
(short)max_int(0, x + border_size), (short)max_int(0, y),
(unsigned short)max_int(0, width - border_size*2), (unsigned short)max_int(0, border_size)
}, // Top
{
(short)max_int(0, x + border_size), (short)max_int(0, y + height - border_size),
(unsigned short)max_int(0, width - border_size*2), (unsigned short)max_int(0, border_size)
}, // Bottom
};
XShapeCombineRectangles(dpy, window, ShapeBounding, 0, 0, rectangles, 4, ShapeSet, Unsorted);
XFlush(dpy);
}
static unsigned long mgl_color_to_x11_color(mgl::Color color) {
if(color.a == 0)
return 0;
return ((uint32_t)color.a << 24) | (((uint32_t)color.r * color.a / 0xFF) << 16) | (((uint32_t)color.g * color.a / 0xFF) << 8) | ((uint32_t)color.b * color.a / 0xFF);
}
static Window get_cursor_window(Display *dpy) {
Window root_window = None;
Window window = None;
int dummy_i;
unsigned int dummy_u;
mgl::vec2i root_pos;
XQueryPointer(dpy, DefaultRootWindow(dpy), &root_window, &window, &root_pos.x, &root_pos.y, &dummy_i, &dummy_i, &dummy_u);
return window;
}
static void get_window_geometry(Display *dpy, Window window, mgl::vec2i &pos, mgl::vec2i &size) {
Window root_window;
int x = 0;
int y = 0;
unsigned int w = 0;
unsigned int h = 0;
unsigned int dummy_border, dummy_depth;
XGetGeometry(dpy, window, &root_window, &x, &y, &w, &h, &dummy_border, &dummy_depth);
pos.x = x;
pos.y = y;
size.x = w;
size.y = h;
}
WindowSelector::WindowSelector() {
}
WindowSelector::~WindowSelector() {
stop();
}
bool WindowSelector::start(mgl::Color border_color) {
if(dpy)
return false;
const unsigned long border_color_x11 = mgl_color_to_x11_color(border_color);
dpy = XOpenDisplay(nullptr);
if(!dpy) {
fprintf(stderr, "Error: WindowSelector::start: failed to connect to the X11 server\n");
return false;
}
const Window cursor_window = get_cursor_window(dpy);
mgl::vec2i cursor_window_pos, cursor_window_size;
get_window_geometry(dpy, cursor_window, cursor_window_pos, cursor_window_size);
XVisualInfo vinfo;
memset(&vinfo, 0, sizeof(vinfo));
XMatchVisualInfo(dpy, DefaultScreen(dpy), 32, TrueColor, &vinfo);
border_window_colormap = XCreateColormap(dpy, DefaultRootWindow(dpy), vinfo.visual, AllocNone);
XSetWindowAttributes window_attr;
window_attr.background_pixel = border_color_x11;
window_attr.border_pixel = 0;
window_attr.override_redirect = true;
window_attr.event_mask = StructureNotifyMask | PointerMotionMask | ButtonPressMask | ButtonReleaseMask;
window_attr.colormap = border_window_colormap;
Screen *screen = XDefaultScreenOfDisplay(dpy);
border_window = XCreateWindow(dpy, DefaultRootWindow(dpy), 0, 0, XWidthOfScreen(screen), XHeightOfScreen(screen), 0,
vinfo.depth, InputOutput, vinfo.visual, CWBackPixel | CWBorderPixel | CWOverrideRedirect | CWEventMask | CWColormap, &window_attr);
if(!border_window) {
fprintf(stderr, "Error: WindowSelector::start: failed to create region window\n");
stop();
return false;
}
set_window_size_not_resizable(dpy, border_window, XWidthOfScreen(screen), XHeightOfScreen(screen));
if(cursor_window && cursor_window != DefaultRootWindow(dpy))
set_region_rectangle(dpy, border_window, cursor_window_pos.x, cursor_window_pos.y, cursor_window_size.x, cursor_window_size.y, rectangle_border_size);
else
set_region_rectangle(dpy, border_window, 0, 0, 0, 0, 0);
make_window_click_through(dpy, border_window);
XMapWindow(dpy, border_window);
crosshair_cursor = XCreateFontCursor(dpy, XC_crosshair);
XGrabPointer(dpy, DefaultRootWindow(dpy), True, PointerMotionMask | ButtonPressMask | ButtonReleaseMask | ButtonMotionMask, GrabModeAsync, GrabModeAsync, None, crosshair_cursor, CurrentTime);
XGrabKeyboard(dpy, DefaultRootWindow(dpy), True, GrabModeAsync, GrabModeAsync, CurrentTime);
XFlush(dpy);
selected = false;
canceled = false;
selected_window = None;
return true;
}
void WindowSelector::stop() {
if(!dpy)
return;
XUngrabPointer(dpy, CurrentTime);
XUngrabKeyboard(dpy, CurrentTime);
if(border_window_colormap) {
XFreeColormap(dpy, border_window_colormap);
border_window_colormap = 0;
}
if(border_window) {
XDestroyWindow(dpy, border_window);
border_window = 0;
}
if(crosshair_cursor) {
XFreeCursor(dpy, crosshair_cursor);
crosshair_cursor = None;
}
XFlush(dpy);
XCloseDisplay(dpy);
dpy = nullptr;
}
bool WindowSelector::is_started() const {
return dpy != nullptr;
}
bool WindowSelector::failed() const {
return !dpy;
}
bool WindowSelector::poll_events() {
if(!dpy || selected)
return false;
XEvent xev;
while(XPending(dpy)) {
XNextEvent(dpy, &xev);
if(xev.type == MotionNotify) {
const Window motion_window = xev.xmotion.subwindow;
mgl::vec2i motion_window_pos, motion_window_size;
get_window_geometry(dpy, motion_window, motion_window_pos, motion_window_size);
if(motion_window && motion_window != DefaultRootWindow(dpy))
set_region_rectangle(dpy, border_window, motion_window_pos.x, motion_window_pos.y, motion_window_size.x, motion_window_size.y, rectangle_border_size);
else
set_region_rectangle(dpy, border_window, 0, 0, 0, 0, 0);
XFlush(dpy);
} else if(xev.type == ButtonRelease && xev.xbutton.button == Button1) {
selected_window = xev.xbutton.subwindow;
const Window clicked_window_real = window_get_target_window_child(dpy, selected_window);
if(clicked_window_real)
selected_window = clicked_window_real;
selected = true;
stop();
break;
} else if(xev.type == KeyRelease && XKeycodeToKeysym(dpy, xev.xkey.keycode, 0) == XK_Escape) {
canceled = true;
selected = false;
stop();
break;
}
}
return true;
}
bool WindowSelector::take_selection() {
const bool result = selected;
selected = false;
return result;
}
bool WindowSelector::take_canceled() {
const bool result = canceled;
canceled = false;
return result;
}
Window WindowSelector::get_selection() const {
return selected_window;
}
}
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