From e028543baa552aa091fe3485b03da48d25ab8179 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Mon, 10 Aug 2020 17:23:34 +0200
Subject: Really start breaking apart HTML.

---
 module/html/view/calendar/shared.scm | 96 ++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 module/html/view/calendar/shared.scm

(limited to 'module/html/view/calendar/shared.scm')

diff --git a/module/html/view/calendar/shared.scm b/module/html/view/calendar/shared.scm
new file mode 100644
index 00000000..d1f58460
--- /dev/null
+++ b/module/html/view/calendar/shared.scm
@@ -0,0 +1,96 @@
+(define-module (html view calendar shared)
+  :use-module (util)
+  :use-module (srfi srfi-1)
+  :use-module (vcomponent)
+  :use-module ((vcomponent datetime)
+               :select (event-length
+                        overlapping?
+                        event-length/clamped))
+  :use-module ((vcomponent datetime output)
+               :select (format-summary))
+  :use-module (util tree)
+  :use-module (datetime)
+  :use-module (html config)
+  :use-module ((html components)
+               :select (btn tabset))
+  :use-module ((html vcomponent)
+               :select (make-block) )
+  )
+
+
+
+(define-public x-pos (make-object-property))
+(define-public width (make-object-property))
+
+
+;; Takes a list of vcomponents, sets their widths and x-positions to optimally
+;; fill out the space, without any overlaps.
+(define*-public (fix-event-widths! lst key: event-length-key (event-length-comperator date/-time>?))
+  ;; The tree construction is greedy. This means
+  ;; that if  a smaller  event preceeds a longer
+  ;; event it would capture  the longer event to
+  ;; only find  events which  also overlaps  the
+  ;; smaller event.
+
+  ;; @var{x} is how for left in the container we are.
+  (let inner ((x 0)
+              (tree (make-tree overlapping?
+                               (sort* lst event-length-comperator event-length-key
+                                      ))))
+    (unless (null? tree)
+      (let ((w (/ (- 1 x)
+                  (+ 1 (length-of-longst-branch (left-subtree tree))))))
+        (set! (width (car tree)) w
+              (x-pos (car tree)) x)
+        (inner (+ x w) (left-subtree tree))
+        (inner x (right-subtree tree))))))
+
+
+(define-public (lay-out-long-events start end events)
+  (fix-event-widths! events event-length-key: event-length
+                     event-length-comperator: date/-time>)
+  (map (lambda (e) (create-top-block start end e))
+       events))
+
+;; date{,time}-difference works in days, and days are simply multiplied by 24 to
+;; get hours.  This means that a day is always assumed to be 24h, even when that's
+;; wrong. This might lead to some weirdness when the timezon switches (DST), but it
+;; makes everything else behave MUCH better.
+(define-public (create-top-block start-date end-date ev)
+
+  (define total-length
+    (* 24 (days-in-interval start-date end-date)))
+
+  (define top (* 100 (x-pos ev)))
+  (define height (* 100 (width ev)))
+  (define left ; start time
+    (* 100
+       (let* ((dt (datetime date: start-date))
+              (diff (datetime-difference
+                     (datetime-max dt (as-datetime (prop ev 'DTSTART)))
+                     dt)))
+         (/ (datetime->decimal-hour diff start-date) total-length))))
+
+  ;; Set length of event, which makes end time
+  (define width*
+    (* 100
+       (/ (datetime->decimal-hour
+           (as-datetime (event-length/clamped start-date end-date ev))
+           start-date)
+          total-length)))
+
+  (define style
+    (if (edit-mode)
+        (format #f "top:calc(var(--editmode)*~,3f%);height:calc(var(--editmode)*~,3f%);left:~,3f%;width:~,3f%;"
+                top height left width*)
+        (format #f "top:~,3f%;height:~,3f%;left:~,3f%;width:~,3f%;"
+                top height left width*)))
+
+  (make-block
+   ev `((class
+          ,(when (date/-time< (prop ev 'DTSTART) start-date)
+             " continued")
+          ,(when (and (prop ev 'DTEND)
+                      (date/-time< (date+ end-date (date day: 1)) (prop ev 'DTEND)))
+             " continuing"))
+        (style ,style))))
-- 
cgit v1.2.3