(#17) Linux implementation, WIP

Author: s1hofmann

src/linux/window_manager.cc

@@ -0,0 +1,58 @@
+#include <X11/Xlib.h>
+#include "../window_manager.h"
+
+Display* connectToX() {
+    Display* xDisplay = XOpenDisplay(NULL);
+
+    if (xDisplay == NULL) {
+        return nullptr;
+    }
+    return xDisplay;
+}
+
+int32_t disconnectFromX(Display* connection) {
+    return XCloseDisplay(connection);
+}
+
+std::vector<WindowHandle> getWindows() {
+    Display* xServer = connectToX();
+    Window window;
+    int32_t revertToWindow;
+    if (XGetInputFocus(xServer, &window, &revertToWindow)) {
+        disconnectFromX(xServer);
+        return std::vector<WindowHandle>{static_cast<WindowHandle>(window)};
+    }
+    return std::vector<WindowHandle>();
+}
+
+std::string getWindowTitle(const WindowHandle windowHandle) {
+    Display* xServer = connectToX();
+    if (xServer != nullptr) {
+        char* windowName = NULL;
+        if (XFetchName(xServer, windowHandle, &windowName)) {
+            std::string wndName = std::string(windowName);
+            XFree(windowName);
+            disconnectFromX(xServer);
+            return wndName;
+        }
+        disconnectFromX(xServer);
+        return "";
+    }
+    return "";
+}
+
+MMRect getWindowRect(const WindowHandle windowHandle) {
+    Display* xServer = connectToX();
+    if (xServer != nullptr) {
+        Window rootWindow;
+        int32_t x, y;
+        uint32_t width, height, border_width, border_height;
+        if (XGetGeometry(xServer, windowHandle, &rootWindow, &x, &y, &width, &height, &border_width, &border_height)) {
+            disconnectFromX(xServer);
+            return MMRectMake(x, y, width, height);
+        }
+        disconnectFromX(xServer);
+        return MMRectMake(0, 0, 0, 0);
+    }
+    return MMRectMake(0, 0, 0, 0);
+}