tinywl: Fix wrong anchor point while resizing a window
Previously, when dragging the left border of a window with the mouse in tinywl, there was a bug where it snap the top level surface's geometry X coordinate directly to the position of the mouse, as if you started the resize right on the border. This also affected the other (right, top and bottom) borders. I think that the previous resize code was hard to understand. Honestly I have not spent a lot of time trying to understand why it didn't work and I wrote another resize algorithm instead: now, instead of working directly with widths and heights which are complicated, we work with the borders (left, right, top, bottom). This is easier to understand IMO. Note: I originally fixed this [in the waybox compositor](https://github.com/wizbright/waybox/pull/23) but then I realized that the code was taken from tinywl and that it had the same issues so I copied my fix for tinywl.
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@ -55,8 +55,7 @@ struct tinywl_server {
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enum tinywl_cursor_mode cursor_mode;
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struct tinywl_view *grabbed_view;
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double grab_x, grab_y;
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struct wlr_box grab_geo_box;
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int grab_width, grab_height;
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struct wlr_box grab_geobox;
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uint32_t resize_edges;
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struct wlr_output_layout *output_layout;
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@ -370,33 +369,44 @@ static void process_cursor_resize(struct tinywl_server *server, uint32_t time) {
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* commit any movement that was prepared.
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*/
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struct tinywl_view *view = server->grabbed_view;
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double dx = server->cursor->x - server->grab_x;
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double dy = server->cursor->y - server->grab_y;
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double x = view->x;
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double y = view->y;
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int width = server->grab_width;
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int height = server->grab_height;
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double border_x = server->cursor->x - server->grab_x;
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double border_y = server->cursor->y - server->grab_y;
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int new_left = server->grab_geobox.x;
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int new_right = server->grab_geobox.x + server->grab_geobox.width;
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int new_top = server->grab_geobox.y;
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int new_bottom = server->grab_geobox.y + server->grab_geobox.height;
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if (server->resize_edges & WLR_EDGE_TOP) {
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y = server->grab_y + dy - server->grab_geo_box.y;
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height -= dy + server->grab_geo_box.y;
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if (height < 1) {
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y += height;
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new_top = border_y;
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if (new_top >= new_bottom) {
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new_top = new_bottom - 1;
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}
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} else if (server->resize_edges & WLR_EDGE_BOTTOM) {
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height += dy + server->grab_geo_box.y;
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new_bottom = border_y;
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if (new_bottom <= new_top) {
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new_bottom = new_top + 1;
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}
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}
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if (server->resize_edges & WLR_EDGE_LEFT) {
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x = server->grab_x + dx - server->grab_geo_box.x;
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width -= dx + server->grab_geo_box.x;
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if (width < 1) {
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x += width;
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new_left = border_x;
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if (new_left >= new_right) {
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new_left = new_right - 1;
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}
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} else if (server->resize_edges & WLR_EDGE_RIGHT) {
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width += dx + server->grab_geo_box.x;
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new_right = border_x;
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if (new_right <= new_left) {
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new_right = new_left + 1;
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}
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view->x = x;
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view->y = y;
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wlr_xdg_toplevel_set_size(view->xdg_surface, width, height);
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}
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struct wlr_box geo_box;
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wlr_xdg_surface_get_geometry(view->xdg_surface, &geo_box);
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view->x = new_left - geo_box.x;
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view->y = new_top - geo_box.y;
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int new_width = new_right - new_left;
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int new_height = new_bottom - new_top;
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wlr_xdg_toplevel_set_size(view->xdg_surface, new_width, new_height);
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}
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static void process_cursor_motion(struct tinywl_server *server, uint32_t time) {
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@ -725,17 +735,25 @@ static void begin_interactive(struct tinywl_view *view,
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}
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server->grabbed_view = view;
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server->cursor_mode = mode;
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wlr_xdg_surface_get_geometry(view->xdg_surface, &server->grab_geo_box);
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if (mode == TINYWL_CURSOR_MOVE) {
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server->grab_x = server->cursor->x - view->x;
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server->grab_y = server->cursor->y - view->y;
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} else {
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server->grab_x = server->cursor->x + server->grab_geo_box.x;
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server->grab_y = server->cursor->y + server->grab_geo_box.y;
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}
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server->grab_width = server->grab_geo_box.width;
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server->grab_height = server->grab_geo_box.height;
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struct wlr_box geo_box;
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wlr_xdg_surface_get_geometry(view->xdg_surface, &geo_box);
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double border_x = (view->x + geo_box.x) + ((edges & WLR_EDGE_RIGHT) ? geo_box.width : 0);
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double border_y = (view->y + geo_box.y) + ((edges & WLR_EDGE_BOTTOM) ? geo_box.height : 0);
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server->grab_x = server->cursor->x - border_x;
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server->grab_y = server->cursor->y - border_y;
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server->grab_geobox = geo_box;
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server->grab_geobox.x += view->x;
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server->grab_geobox.y += view->y;
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server->resize_edges = edges;
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}
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}
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static void xdg_toplevel_request_move(
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