Implement resizing (still buggy)

Committing basic resizing functionality. We need testcases for the bugs and
then eliminate them.

Makefile

@@ -4,7 +4,7 @@ include $(TOPDIR)/common.mk
 
 # Depend on the object files of all source-files in src/*.c and on all header files
 AUTOGENERATED:=src/cfgparse.tab.c src/cfgparse.yy.c src/cmdparse.tab.c src/cmdparse.yy.c
-FILES:=src/ipc.c src/main.c src/log.c src/util.c src/tree.c src/xcb.c src/manage.c src/workspace.c src/x.c src/floating.c src/click.c src/config.c src/handlers.c src/randr.c src/xinerama.c src/con.c src/load_layout.c src/render.c src/window.c src/match.c src/xcursor.c
+FILES:=src/ipc.c src/main.c src/log.c src/util.c src/tree.c src/xcb.c src/manage.c src/workspace.c src/x.c src/floating.c src/click.c src/config.c src/handlers.c src/randr.c src/xinerama.c src/con.c src/load_layout.c src/render.c src/window.c src/match.c src/xcursor.c src/resize.c
 FILES:=$(FILES:.c=.o)
 HEADERS:=$(filter-out include/loglevels.h,$(wildcard include/*.h))
 

include/all.h

@@ -52,5 +52,6 @@
 #include "match.h"
 #include "cmdparse.h"
 #include "xcursor.h"
+#include "resize.h"
 
 #endif

include/resize.h

@@ -0,0 +1,6 @@
+#ifndef _RESIZE_H
+#define _RESIZE_H
+
+int resize_graphical_handler(Con *first, Con *second, orientation_t orientation, xcb_button_press_event_t *event);
+
+#endif

src/click.c

@@ -309,15 +309,82 @@ int handle_button_press(void *ignored, xcb_connection_t *conn, xcb_button_press_
         }
 #endif
 
-        return 1;
+        //return 1;
     }
 
     /* click to focus */
     con_focus(con);
     tree_render();
 
+    Con *clicked_into = NULL;
+
+    Con *child;
+    TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
+        if (!rect_contains(child->deco_rect, event->event_x, event->event_y))
+            continue;
+
+        clicked_into = child;
+        break;
+    }
+
+    /* check if this was a click on the window border (and on which one) */
+    Rect bsr = con_border_style_rect(con);
+    DLOG("BORDER x = %d, y = %d for con %p, window 0x%08x, border_click = %d, clicked_into = %p\n",
+            event->event_x, event->event_y, con, event->event, border_click, clicked_into);
+    DLOG("checks for right >= %d\n", con->window_rect.x + con->window_rect.width);
+    Con *first = NULL, *second = NULL;
+    if (clicked_into) {
+        DLOG("BORDER top\n");
+        second = clicked_into;
+        first = TAILQ_PREV(clicked_into, nodes_head, nodes);
+
+        if (first == TAILQ_END(&(con->parent->nodes_head))) {
+            DLOG("cannot go further\n");
+            return 0;
+        }
+
+        resize_graphical_handler(first, second, VERT, event);
+    } else if (event->event_x >= 0 && event->event_x <= bsr.x &&
+        event->event_y >= bsr.y && event->event_y <= con->rect.height + bsr.height) {
+        DLOG("BORDER left\n");
+        second = con;
+        first = TAILQ_PREV(con, nodes_head, nodes);
+        if (first == TAILQ_END(&(con->parent->nodes_head))) {
+            DLOG("cannot go further\n");
+            return 0;
+        }
+
+        resize_graphical_handler(first, second, HORIZ, event);
+    } else if (event->event_x >= (con->window_rect.x + con->window_rect.width) &&
+        event->event_y >= bsr.y && event->event_y <= con->rect.height + bsr.height) {
+        DLOG("BORDER right\n");
+        first = con;
+        second = TAILQ_NEXT(con, nodes);
+        if (second == TAILQ_END(&(con->parent->nodes_head))) {
+            DLOG("cannot go further\n");
+            return 0;
+        }
+
+        resize_graphical_handler(first, second, HORIZ, event);
+    } else if (event->event_y >= (con->window_rect.y + con->window_rect.height)) {
+        DLOG("BORDER bottom\n");
+
+        first = con;
+        second = TAILQ_NEXT(con, nodes);
+        if (second == TAILQ_END(&(con->parent->nodes_head))) {
+            DLOG("cannot go further\n");
+            return 0;
+        }
+
+        resize_graphical_handler(first, second, VERT, event);
+    } else {
+        /* No border click, replay the click */
         xcb_allow_events(conn, XCB_ALLOW_REPLAY_POINTER, event->time);
         xcb_flush(conn);
+    }
+
+    tree_render();
+
     return 0;
 #if 0
         if (client == NULL) {

src/resize.c

@@ -0,0 +1,133 @@
+/*
+ * vim:ts=4:sw=4:expandtab
+ */
+#include "all.h"
+
+extern xcb_connection_t *conn;
+
+/*
+ * This is an ugly data structure which we need because there is no standard
+ * way of having nested functions (only available as a gcc extension at the
+ * moment, clang doesn’t support it) or blocks (only available as a clang
+ * extension and only on Mac OS X systems at the moment).
+ *
+ */
+struct callback_params {
+    orientation_t orientation;
+    Con *output;
+    xcb_window_t helpwin;
+    uint32_t *new_position;
+};
+
+DRAGGING_CB(resize_callback) {
+    struct callback_params *params = extra;
+    Con *output = params->output;
+    DLOG("new x = %d, y = %d\n", new_x, new_y);
+    if (params->orientation == HORIZ) {
+        /* Check if the new coordinates are within screen boundaries */
+        if (new_x > (output->rect.x + output->rect.width - 25) ||
+            new_x < (output->rect.x + 25))
+            return;
+
+        *(params->new_position) = new_x;
+        xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_X, params->new_position);
+    } else {
+        if (new_y > (output->rect.y + output->rect.height - 25) ||
+            new_y < (output->rect.y + 25))
+            return;
+
+        *(params->new_position) = new_y;
+        xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_Y, params->new_position);
+    }
+
+    xcb_flush(conn);
+}
+
+int resize_graphical_handler(Con *first, Con *second, orientation_t orientation, xcb_button_press_event_t *event) {
+    DLOG("resize handler\n");
+
+    uint32_t new_position;
+
+    /* TODO: previously, we were getting a rect containing all screens. why? */
+    Con *output = con_get_output(first);
+    DLOG("x = %d, width = %d\n", output->rect.x, output->rect.width);
+
+    uint32_t mask = 0;
+    uint32_t values[2];
+
+    mask = XCB_CW_OVERRIDE_REDIRECT;
+    values[0] = 1;
+
+    /* Open a new window, the resizebar. Grab the pointer and move the window around
+       as the user moves the pointer. */
+    xcb_window_t grabwin = create_window(conn, output->rect, XCB_WINDOW_CLASS_INPUT_ONLY, XCURSOR_CURSOR_POINTER, true, mask, values);
+
+    Rect helprect;
+    if (orientation == HORIZ) {
+        helprect.x = event->root_x;
+        helprect.y = output->rect.y;
+        helprect.width = 2;
+        helprect.height = output->rect.height;
+        new_position = event->root_x;
+    } else {
+        helprect.x = output->rect.x;
+        helprect.y = event->root_y;
+        helprect.width = output->rect.width;
+        helprect.height = 2;
+        new_position = event->root_y;
+    }
+
+    mask = XCB_CW_BACK_PIXEL;
+    values[0] = config.client.focused.border;
+
+    mask |= XCB_CW_OVERRIDE_REDIRECT;
+    values[1] = 1;
+
+    xcb_window_t helpwin = create_window(conn, helprect, XCB_WINDOW_CLASS_INPUT_OUTPUT,
+                                         (orientation == HORIZ ?
+                                          XCURSOR_CURSOR_RESIZE_HORIZONTAL :
+                                          XCURSOR_CURSOR_RESIZE_VERTICAL), true, mask, values);
+
+    xcb_circulate_window(conn, XCB_CIRCULATE_RAISE_LOWEST, helpwin);
+
+    xcb_flush(conn);
+
+    struct callback_params params = { orientation, output, helpwin, &new_position };
+
+    drag_pointer(NULL, event, grabwin, BORDER_TOP, resize_callback, &params);
+
+    xcb_destroy_window(conn, helpwin);
+    xcb_destroy_window(conn, grabwin);
+    xcb_flush(conn);
+
+    int pixels;
+    if (orientation == HORIZ)
+        pixels = (new_position - event->root_x);
+    else pixels = (new_position - event->root_y);
+
+    DLOG("Done, pixels = %d\n", pixels);
+
+    double new_percent, difference;
+    int children = con_num_children(first->parent);
+    double percent = 1.0 / children;
+    if (first->percent > 0.0)
+        percent = first->percent;
+    DLOG("percent = %f\n", percent);
+    int original = (orientation == HORIZ ? first->rect.width : first->rect.height);
+    DLOG("original = %d\n", original);
+    new_percent = (original + pixels) * (percent / original);
+    difference = percent - new_percent;
+    DLOG("difference = %f\n", difference);
+    DLOG("new percent = %f\n", new_percent);
+
+    first->percent = new_percent;
+
+    double s_percent = 1.0 / children;
+    if (second->percent > 0.0)
+        s_percent = second->percent;
+
+    second->percent = s_percent + difference;
+    DLOG("second->percent = %f\n", second->percent);
+
+    return 0;
+}