empty columns need 100px for drop

.gitignore

@@ -0,0 +1,2 @@
+PLAN-*
+

Asset/css/shrink-vertically.css

@@ -13,8 +13,10 @@
  * breathing room). A fixed-px budget is more reliable than a proportional vh value
  * because that chrome is a fixed height regardless of screen size.
  *
- * Tune the single number below (240px) if the scrollbar is still clipped or if you
+ * The pixel budget is the --sv-shrink-offset CSS variable. It is injected in the
- * want the columns taller.
+ * page head from the plugin setting (Settings -> Shrink Vertically); when unset it
+ * falls back to 240px below. Increase it if the scrollbar is still clipped, or
+ * decrease it to make the columns taller.
  *
  * The selector is intentionally more specific than core's single-class rule, and
  * uses !important, so this override wins even alongside a theme (e.g. Essential).
@@ -24,9 +26,54 @@
  * (BoardDragAndDrop.js: css("min-height", parent().height())). In CSS, min-height
  * beats max-height, so that inline value keeps tall columns from shrinking and our
  * max-height alone does nothing. A stylesheet !important overrides the inline
- * (non-important) min-height, so we reset it to 0 and let max-height win.
+ * (non-important) min-height so max-height can win.
+ *
+ * We override it to a small NON-ZERO value, not 0: Kanboard relies on that same inline
+ * min-height to keep EMPTY columns tall enough to be a drop target, so zeroing it makes
+ * you unable to drop a card into an empty collapsed column. 100px clears Kanboard's 70px
+ * drag placeholder (.draggable-placeholder) with margin, and stays well below max-height
+ * so tall columns still shrink; non-empty columns are unaffected (their content is taller).
  */
 #board td .board-task-list.board-task-list-compact {
-    max-height: calc(100vh - 240px) !important;
+    max-height: calc(100vh - var(--sv-shrink-offset, 240px)) !important;
-    min-height: 0 !important;
+    min-height: 100px !important;
+}
+
+/*
+ * Optional custom top horizontal scrollbar (built by Asset/js/top-scrollbar.js when the
+ * "Add a top horizontal scrollbar" setting is enabled). It is a track + draggable thumb,
+ * not a native scrollbar, so it renders and can be sized identically in every browser
+ * (Chrome, Firefox, Safari) and on touch. Thickness follows the --sv-bar-size variable
+ * (Settings -> Shrink Vertically), injected in the page head; falls back to 25px.
+ * touch-action: none lets a finger drag the thumb without scrolling the page.
+ */
+.sv-top-scroll {
+    position: relative;
+    width: 100%;
+    height: var(--sv-bar-size, 25px);
+    background: rgba(0, 0, 0, 0.06);
+    border-radius: 4px;
+    overflow: hidden;
+    touch-action: none;
+}
+
+.sv-top-scroll-thumb {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 0;
+    height: 100%;
+    background: rgba(0, 0, 0, 0.35);
+    border-radius: 4px;
+    cursor: grab;
+    touch-action: none;
+}
+
+.sv-top-scroll.sv-dragging .sv-top-scroll-thumb {
+    cursor: grabbing;
+    background: rgba(0, 0, 0, 0.5);
+}
+
+.sv-dragging {
+    user-select: none;
 }

Asset/js/top-scrollbar.js

@@ -0,0 +1,154 @@
+/*
+ * ShrinkVertically -- optional custom horizontal scrollbar above the board.
+ *
+ * Kanboard's board scrolls horizontally inside #board-container (overflow-x: auto), so the
+ * only native horizontal scrollbar sits at the very bottom of the board. On a wide board
+ * you have to scroll all the way down to reach it. This adds a second scrollbar just above
+ * the columns and keeps it in sync with the board.
+ *
+ * Unlike a native scrollbar (whose thickness cannot be sized in Firefox), this is a custom
+ * track + thumb widget: it renders and behaves the same in every browser (Chrome, Firefox,
+ * Safari) and on touch, and its thickness follows the --sv-bar-size setting.
+ *
+ * Loaded only when the "Add a top horizontal scrollbar" setting is enabled.
+ */
+(function () {
+    "use strict";
+
+    // Keep the thumb wide enough to grab, even on a very wide board.
+    var MIN_THUMB = 24;
+
+    function init() {
+        var container = document.getElementById("board-container");
+
+        // Only on the board, and never add it twice.
+        if (!container || document.querySelector(".sv-top-scroll")) {
+            return;
+        }
+
+        var track = document.createElement("div");
+        track.className = "sv-top-scroll";
+
+        var thumb = document.createElement("div");
+        thumb.className = "sv-top-scroll-thumb";
+        track.appendChild(thumb);
+
+        container.parentNode.insertBefore(track, container);
+
+        var dragging = false;
+        var dragStartX = 0;
+        var dragStartScrollLeft = 0;
+
+        function metrics() {
+            return {
+                viewport: container.clientWidth,
+                content: container.scrollWidth,
+                trackW: track.clientWidth
+            };
+        }
+
+        function positionThumb(m, thumbW) {
+            var maxScroll = m.content - m.viewport;
+            var maxThumb = m.trackW - thumbW;
+            var left = maxScroll > 0 ? (container.scrollLeft / maxScroll) * maxThumb : 0;
+            thumb.style.transform = "translateX(" + Math.round(left) + "px)";
+        }
+
+        // Recompute thumb width/position; hide the whole bar when nothing to scroll.
+        function layout() {
+            var m = metrics();
+
+            if (m.content <= m.viewport || m.trackW <= 0) {
+                track.style.display = "none";
+                return;
+            }
+
+            track.style.display = "";
+
+            var thumbW = Math.round(m.trackW * m.viewport / m.content);
+            if (thumbW < MIN_THUMB) { thumbW = MIN_THUMB; }
+            if (thumbW > m.trackW) { thumbW = m.trackW; }
+
+            thumb.style.width = thumbW + "px";
+            positionThumb(m, thumbW);
+        }
+
+        // Board scrolled by any other means -> keep the thumb in sync.
+        container.addEventListener("scroll", function () {
+            if (dragging) { return; }
+            var m = metrics();
+            if (m.content <= m.viewport) { return; }
+            positionThumb(m, thumb.offsetWidth);
+        });
+
+        // Drag the thumb (mouse + touch via Pointer Events).
+        thumb.addEventListener("pointerdown", function (e) {
+            e.preventDefault();
+            e.stopPropagation();
+            dragging = true;
+            dragStartX = e.clientX;
+            dragStartScrollLeft = container.scrollLeft;
+            track.classList.add("sv-dragging");
+            if (thumb.setPointerCapture) {
+                thumb.setPointerCapture(e.pointerId);
+            }
+        });
+
+        thumb.addEventListener("pointermove", function (e) {
+            if (!dragging) { return; }
+            var m = metrics();
+            var maxThumb = m.trackW - thumb.offsetWidth;
+            var maxScroll = m.content - m.viewport;
+            if (maxThumb <= 0) { return; }
+            container.scrollLeft = dragStartScrollLeft + (e.clientX - dragStartX) * (maxScroll / maxThumb);
+            positionThumb(m, thumb.offsetWidth);
+        });
+
+        function endDrag(e) {
+            if (!dragging) { return; }
+            dragging = false;
+            track.classList.remove("sv-dragging");
+            if (thumb.releasePointerCapture && e && e.pointerId != null) {
+                try { thumb.releasePointerCapture(e.pointerId); } catch (err) { /* ignore */ }
+            }
+        }
+
+        thumb.addEventListener("pointerup", endDrag);
+        thumb.addEventListener("pointercancel", endDrag);
+
+        // Click on the empty track -> jump so the thumb centers under the pointer.
+        track.addEventListener("pointerdown", function (e) {
+            if (e.target === thumb || dragging) { return; }
+            var m = metrics();
+            if (m.content <= m.viewport) { return; }
+
+            var thumbW = thumb.offsetWidth;
+            var maxThumb = m.trackW - thumbW;
+            var maxScroll = m.content - m.viewport;
+            if (maxThumb <= 0) { return; }
+
+            var clickX = e.clientX - track.getBoundingClientRect().left;
+            var targetLeft = clickX - thumbW / 2;
+            if (targetLeft < 0) { targetLeft = 0; }
+            if (targetLeft > maxThumb) { targetLeft = maxThumb; }
+
+            container.scrollLeft = (targetLeft / maxThumb) * maxScroll;
+            positionThumb(m, thumbW);
+        });
+
+        window.addEventListener("resize", layout);
+
+        // The board can be redrawn by AJAX polling / drag-and-drop; keep sizes current.
+        if (window.MutationObserver) {
+            new MutationObserver(layout).observe(container, { childList: true, subtree: true });
+        }
+
+        layout();
+    }
+
+    if (document.readyState === "loading") {
+        document.addEventListener("DOMContentLoaded", init);
+    } else {
+        init();
+    }
+})();

Controller/ConfigController.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace Kanboard\Plugin\ShrinkVertically\Controller;
+
+use Kanboard\Controller\BaseController;
+
+/**
+ * Settings page for the ShrinkVertically plugin: configure how many pixels are
+ * reserved around the vertically collapsed board columns.
+ */
+class ConfigController extends BaseController
+{
+    const DEFAULT_OFFSET = 240;
+    const MIN_OFFSET = 0;
+    const MAX_OFFSET = 2000;
+
+    const DEFAULT_BAR_SIZE = 25;
+    const MIN_BAR_SIZE = 0;
+    const MAX_BAR_SIZE = 200;
+
+    public function show()
+    {
+        $offset = (int) $this->configModel->get('shrink_vertically_offset', self::DEFAULT_OFFSET);
+        $barSize = (int) $this->configModel->get('shrink_vertically_bar_size', self::DEFAULT_BAR_SIZE);
+        $topScrollbar = (int) $this->configModel->get('shrink_vertically_top_scrollbar', 1);
+
+        $this->response->html($this->helper->layout->config('shrinkVertically:config/show', array(
+            'title' => t('Settings').' &gt; '.t('Shrink Vertically'),
+            'values' => array(
+                'shrink_vertically_offset' => $offset,
+                'shrink_vertically_bar_size' => $barSize,
+                'shrink_vertically_top_scrollbar' => $topScrollbar,
+            ),
+            'errors' => array(),
+        )));
+    }
+
+    public function save()
+    {
+        $values = $this->request->getValues();
+
+        $offset = isset($values['shrink_vertically_offset']) ? (int) $values['shrink_vertically_offset'] : self::DEFAULT_OFFSET;
+        $offset = max(self::MIN_OFFSET, min(self::MAX_OFFSET, $offset));
+
+        $barSize = isset($values['shrink_vertically_bar_size']) ? (int) $values['shrink_vertically_bar_size'] : self::DEFAULT_BAR_SIZE;
+        $barSize = max(self::MIN_BAR_SIZE, min(self::MAX_BAR_SIZE, $barSize));
+
+        $topScrollbar = isset($values['shrink_vertically_top_scrollbar']) ? 1 : 0;
+
+        if ($this->configModel->save(array(
+            'shrink_vertically_offset' => $offset,
+            'shrink_vertically_bar_size' => $barSize,
+            'shrink_vertically_top_scrollbar' => $topScrollbar,
+        ))) {
+            $this->flash->success(t('Settings saved successfully.'));
+        } else {
+            $this->flash->failure(t('Unable to save your settings.'));
+        }
+
+        $this->response->redirect($this->helper->url->to('ConfigController', 'show', array('plugin' => 'ShrinkVertically')));
+    }
+}

Plugin.php

@@ -14,11 +14,24 @@ class Plugin extends Base
             'template' => 'plugins/ShrinkVertically/Asset/css/shrink-vertically.css',
         ));
 
+        // Inject the configured pixel offset as a CSS variable in the page head.
+        $this->template->hook->attach('template:layout:head', 'shrinkVertically:layout/variable');
+
         // Append a "+" to the two vertical-collapse menu labels so it is visible
         // that the behaviour is modified by this plugin.
         $this->hook->on('template:layout:js', array(
             'template' => 'plugins/ShrinkVertically/Asset/js/shrink-vertically.js',
         ));
+
+        // Add a "Shrink Vertically" entry to the Settings sidebar.
+        $this->template->hook->attach('template:config:sidebar', 'shrinkVertically:config/sidebar');
+
+        // Optional: a second, mirrored horizontal scrollbar above the board columns.
+        if ((int) $this->configModel->get('shrink_vertically_top_scrollbar', 1) === 1) {
+            $this->hook->on('template:layout:js', array(
+                'template' => 'plugins/ShrinkVertically/Asset/js/top-scrollbar.js',
+            ));
+        }
     }
 
     public function getPluginName()
@@ -38,7 +51,7 @@ class Plugin extends Base
 
     public function getPluginVersion()
     {
-        return '0.1.0';
+        return '1.4.1';
     }
 
     public function getPluginHomepage()

README.md

@@ -1,7 +1,12 @@
 # ShrinkVertically -- keep the board horizontal scrollbar visible
 
-A tiny Kanboard plugin that fixes the vertically-collapsed board view so the bottom
+A small Kanboard plugin focused on the vertically-collapsed board view. It fixes the
-horizontal scrollbar stays on screen.
+collapse so the bottom horizontal scrollbar stays on screen, and can optionally add a
+second mirrored scrollbar above the columns. Configurable under
+"Settings -> Shrink Vertically".
+
+Board drag/touch and column-gap options that used to live here have moved to the separate
+`TweakDrag` plugin.
 
 ## The problem
 
@@ -25,13 +30,19 @@ list:
 
 ```css
 #board td .board-task-list.board-task-list-compact {
-    max-height: calc(100vh - 240px) !important;
+    max-height: calc(100vh - var(--sv-shrink-offset, 240px)) !important;
+    min-height: 0 !important;
 }
 ```
 
-The `240px` reserves room for the page header, the board column header, the horizontal
+The offset reserves room for the page header, the board column header, the horizontal
 scrollbar, and a little breathing space. A fixed-pixel budget is more reliable than a
-proportional value because that chrome is a fixed height regardless of screen size.
+proportional value because that chrome is a fixed height regardless of screen size. It
+defaults to `240px` and is configurable (see Settings below).
+
+The `min-height: 0` is essential: Kanboard's drag-and-drop sets an inline `min-height` on
+each column equal to its full content height, and in CSS `min-height` beats `max-height`,
+so without this reset the tall columns would never shrink.
 
 The override only applies while columns are collapsed (when core adds the
 `board-task-list-compact` class). It changes no data and runs no database migration.
@@ -53,11 +64,32 @@ Copy this folder into your Kanboard installation as `plugins/ShrinkVertically/`.
 directory name must be exactly `ShrinkVertically` (Kanboard derives the plugin namespace
 from the folder name). Reload the board; no build step, no configuration.
 
-## Tuning
+## Top horizontal scrollbar (optional)
 
-Edit the single `240px` value in `Asset/css/shrink-vertically.css`. Increase it if the
+Kanboard's board scrolls horizontally inside `#board-container`, so its only horizontal
-scrollbar is still clipped (for example with a taller theme header); decrease it to make
+scrollbar is at the very bottom of the board -- on a wide board you must scroll all the
-the collapsed columns taller.
+way down to move sideways. Enable "Add a top horizontal scrollbar" in the settings to get
+a second scrollbar just above the columns.
+
+It is a custom track + draggable thumb (`Asset/js/top-scrollbar.js`, loaded only when the
+option is on), not a native scrollbar, so it renders and can be sized the same in every
+browser (Chrome, Firefox, Safari) and on touch. Drag the thumb or click the track to move
+the board; the thumb tracks the board when you scroll it by other means. Its thickness
+follows the "Top Horizontal Scrollbar thickness" setting.
+
+## Settings
+
+These settings are global (per Kanboard instance) and admin-only. Go to
+"Settings -> Shrink Vertically":
+
+- **Vertical offset in pixels** -- pixels reserved around the collapsed columns. Injected
+  in the page head as the `--sv-shrink-offset` CSS variable. Increase it if the scrollbar
+  is still clipped (for example with a taller theme header); decrease it to make the
+  collapsed columns taller. Default: 240.
+- **Top Horizontal Scrollbar thickness in pixels** -- thickness of the custom top
+  scrollbar (all browsers). Injected as the `--sv-bar-size` CSS variable. Default: 25.
+- **Add a top horizontal scrollbar to the board** -- toggles the mirrored top scrollbar
+  described above. Default: on.
 
 ## License
 

Template/config/show.php

@@ -0,0 +1,34 @@
+<div class="page-header">
+    <h2><?= t('Shrink Vertically') ?></h2>
+</div>
+
+<form method="post" action="<?= $this->url->href('ConfigController', 'save', array('plugin' => 'ShrinkVertically')) ?>" autocomplete="off">
+    <?= $this->form->csrf() ?>
+
+    <fieldset>
+        <?= $this->form->label(t('Vertical offset in pixels'), 'shrink_vertically_offset') ?>
+        <?= $this->form->number('shrink_vertically_offset', $values, $errors) ?>
+        <p class="form-help">
+            <?= t('Pixels reserved above and below the vertically collapsed board columns (page header, column header and the horizontal scrollbar). A larger value makes the columns shorter. Default: 240.') ?>
+        </p>
+    </fieldset>
+
+    <fieldset>
+        <?= $this->form->label(t('Top Horizontal Scrollbar thickness in pixels'), 'shrink_vertically_bar_size') ?>
+        <?= $this->form->number('shrink_vertically_bar_size', $values, $errors) ?>
+        <p class="form-help">
+            <?= t('Thickness of the top horizontal scrollbar. Default: 25.') ?>
+        </p>
+    </fieldset>
+
+    <fieldset>
+        <?= $this->form->checkbox('shrink_vertically_top_scrollbar', t('Add a top horizontal scrollbar to the board'), 1, isset($values['shrink_vertically_top_scrollbar']) && $values['shrink_vertically_top_scrollbar'] == 1) ?>
+        <p class="form-help">
+            <?= t('Adds a second horizontal scrollbar above the columns, mirrored with the board scrollbar, so you do not have to scroll to the bottom to move sideways.') ?>
+        </p>
+    </fieldset>
+
+    <div class="form-actions">
+        <button type="submit" class="btn btn-blue"><?= t('Save') ?></button>
+    </div>
+</form>

Template/config/sidebar.php

@@ -0,0 +1,3 @@
+<li <?= $this->app->checkMenuSelection('ConfigController', 'show', 'ShrinkVertically') ?>>
+    <?= $this->url->link(t('Shrink Vertically'), 'ConfigController', 'show', array('plugin' => 'ShrinkVertically')) ?>
+</li>

Template/layout/variable.php

@@ -0,0 +1,6 @@
+<style type="text/css">
+    :root {
+        --sv-shrink-offset: <?= (int) $this->app->config('shrink_vertically_offset', 240) ?>px;
+        --sv-bar-size: <?= (int) $this->app->config('shrink_vertically_bar_size', 25) ?>px;
+    }
+</style>

VERSION

@@ -0,0 +1 @@
+ShrinkVertically v1.4.1