Implement floating (please test and find bugs)

Details which are missing: A command to hide/show all floating clients,
moving/resizing clients with your mouse holding Mod1 (click anywhere
in the client, not just on its borders), resize/move by keyboard, select
next/previous client by keyboard

include/data.h

@@ -253,6 +253,8 @@ struct Client {
 
         /* x, y, width, height of the frame */
         Rect rect;
+        /* Position in floating mode and in tiling mode are saved separately */
+        Rect floating_rect;
         /* x, y, width, height of the child (relative to its frame) */
         Rect child_rect;
 
@@ -282,6 +284,9 @@ struct Client {
         /* fullscreen is pretty obvious */
         bool fullscreen;
 
+        /* floating? (= not in tiling layout) */
+        bool floating;
+
         /* Ensure TITLEBAR_TOP maps to 0 because we use calloc for initialization later */
         enum { TITLEBAR_TOP = 0, TITLEBAR_LEFT, TITLEBAR_RIGHT, TITLEBAR_BOTTOM, TITLEBAR_OFF } titlebar_position;
 

include/floating.h

@@ -0,0 +1,37 @@
+/*
+ * vim:ts=8:expandtab
+ *
+ * i3 - an improved dynamic tiling window manager
+ *
+ * (c) 2009 Michael Stapelberg and contributors
+ *
+ * See file LICENSE for license information.
+ *
+ */
+#ifndef _FLOATING_H
+#define _FLOATING_H
+
+/**
+ * Enters floating mode for the given client.
+ * Correctly takes care of the position/size (separately stored for tiling/floating mode)
+ * and repositions/resizes/redecorates the client.
+ *
+ */
+void toggle_floating_mode(xcb_connection_t *conn, Client *client);
+
+/**
+ * Called whenever the user clicks on a border (not the titlebar!) of a floating window.
+ * Determines on which border the user clicked and launches the drag_pointer function
+ * with the resize_callback.
+ *
+ */
+int floating_border_click(xcb_connection_t *conn, Client *client, xcb_button_press_event_t *event);
+
+/**
+ * Called when the user clicked on the titlebar of a floating window.
+ * Calls the drag_pointer function with the drag_window callback
+ *
+ */
+void floating_drag_window(xcb_connection_t *conn, Client *client, xcb_button_press_event_t *event);
+
+#endif

include/layout.h

@@ -36,6 +36,18 @@ void decorate_window(xcb_connection_t *conn, Client *client, xcb_drawable_t draw
  */
 void redecorate_window(xcb_connection_t *conn, Client *client);
 
+/**
+ * Pushes the client’s x and y coordinates to X11
+ *
+ */
+void reposition_client(xcb_connection_t *conn, Client *client);
+
+/**
+ * Pushes the client’s width/height to X11 and resizes the child window
+ *
+ */
+void resize_client(xcb_connection_t *conn, Client *client);
+
 /**
  * Renders the given container. Is called by render_layout() or individually (for example
  * when focus changes in a stacking container)

include/xcb.h

@@ -126,4 +126,10 @@ void fake_absolute_configure_notify(xcb_connection_t *conn, Client *client);
  */
 void xcb_get_numlock_mask(xcb_connection_t *conn);
 
+/**
+ * Raises the given window (typically client->frame) above all other windows
+ *
+ */
+void xcb_raise_window(xcb_connection_t *conn, xcb_window_t window);
+
 #endif