Improve snapping behavior and add undo in EditableTemplate

doc/how_to/notebook/layout_builder.md

@@ -114,6 +114,12 @@ You might want to reorder the cards for a more logical flow. To do this, drag th
 
 ![Builder Rearrange View](../../_static/images/builder_rearrange.png)
 
+### Undo
+
+You might want to undo previous remove, resize and reorder actions:
+
+![Builder Rearrange View](../../_static/images/builder_undo.png)
+
 ### Resetting Layout
 
 If you're not satisfied with the changes, you can start over by clicking the reset button at the top right.

examples/reference/templates/EditableTemplate.ipynb

@@ -128,15 +128,19 @@
     "\n",
     "<img src=\"data:image/svg+xml;base64,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\"></img>\n",
     "\n",
-    "In edit mode we additionally have reset and save icons in the header:\n",
+    "In edit mode we additionally have undo, reset and save icons in the header:\n",
     "\n",
-    "- Save: Persists the current layout into the browser storage overriding the layout persisted on the server.\n",
+    "- Undo: Undo previous delete, resize and re-arrange actions.\n",
     "\n",
-    "<img src=\"data:image/svg+xml;base64,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\"></img>\n",
+    "<img src=\"data:image/svg+xml;base64,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\" width=\"24\" height=\"24\"></img>\n",
     "\n",
     "- Reset: Resets the arrangement and order of the individual components to the default.\n",
     "\n",
-    "<img src=\"data:image/svg+xml;base64,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\" width=\"24\" height=\"24\"></img>"
+    "<img src=\"data:image/svg+xml;base64,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\" width=\"24\" height=\"24\"></img>\n",
+    "\n",
+    "- Save: Persists the current layout into the browser storage overriding the layout persisted on the server.\n",
+    "\n",
+    "<img src=\"data:image/svg+xml;base64,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\"></img>\n"
    ]
   }
  ],

panel/io/handlers.py

@@ -568,7 +568,7 @@ def _render_template(self, doc, path):
         reset = 'reset' in state.session_args
         if not (editable or persist):
             state.template.editable = False
-        state.template.title = os.path.splitext(os.path.basename(path))[0].title()
+        state.template.title = os.path.splitext(os.path.basename(path))[0].replace('_', ' ').title()
 
         layouts, outputs, cells = {}, {}, {}
         for cell_id, objects in state._cell_outputs.items():

panel/template/editable/editable.css

@@ -7,8 +7,8 @@
   background-color: currentColor;
   cursor: pointer;
   mask-size: cover;
-  height: 18px;
-  width: 18px;
+  height: 20px;
+  width: 20px;
   margin-left: 10px;
   -webkit-mask-size: cover;
 }
@@ -22,8 +22,15 @@
 }
 
 #grid-reset {
-  mask-image: url('data:image/svg+xml;base64,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');
-  -webkit-mask-image: url('data:image/svg+xml;base64,PHN2ZyBmaWxsPSIjZmZmZmZmIiB3aWR0aD0iODAwcHgiIGhlaWdodD0iODAwcHgiIHZpZXdCb3g9IjAgMCAxOTIwIDE5MjAiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+DQogICAgPHBhdGggZD0iTTk2MCAwdjIxMy4zMzNjNDExLjYyNyAwIDc0Ni42NjcgMzM0LjkzNCA3NDYuNjY3IDc0Ni42NjdTMTM3MS42MjcgMTcwNi42NjcgOTYwIDE3MDYuNjY3IDIxMy4zMzMgMTM3MS43MzMgMjEzLjMzMyA5NjBjMC0xOTcuMDEzIDc4LjQtMzgyLjUwNyAyMTMuMzM0LTUyMC43NDd2MjU0LjA4SDY0MFYxMDYuNjY3SDUzLjMzM1YzMjBoMTkxLjA0Qzg4LjY0IDQ5NC4wOCAwIDcyMC45NiAwIDk2MGMwIDUyOS4yOCA0MzAuNjEzIDk2MCA5NjAgOTYwczk2MC00MzAuNzIgOTYwLTk2MFMxNDg5LjM4NyAwIDk2MCAwIiBmaWxsLXJ1bGU9ImV2ZW5vZGQiLz4NCjwvc3ZnPg0K');
+  mask-image: url('data:image/svg+xml;base64,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');
+  -webkit-mask-image: url('data:image/svg+xml;base64,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');
+}
+
+#grid-undo {
+  mask-image: url('data:image/svg+xml;base64,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');
+  -webkit-mask-image: url('data:image/svg+xml;base64,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');
+  height: 25px;
+  width: 25px;
 }
 
 #grid-save {

panel/template/editable/editable.html

@@ -3,6 +3,7 @@
 {% block header_end %}
 {% if editable %}
 <div id="header-indicators">
+  <div id="grid-undo" class="header-icon disabled-button" title="Undo the last action"></div>
   <div id="grid-reset" class="header-icon" title="Reset the Layout"></div>
   {% if local_save %}
   <div id="grid-save" class="header-icon disabled-button" title="Save the Layout to Local Storage"></div>
@@ -170,7 +171,21 @@
     dragEnabled: {{ editable|json }},
     dragHandle: '.muuri-handle.drag',
     layout: {fillGaps: true}
-  });
+  }).on('dragInit', function () {
+    undo_stack.push({action: "drag", items: grid.getItems()})
+  }).on('dragEnd', function () {
+    const last_event = undo_stack.pop()
+    if (last_event.action == "move") {
+      undo_stack.push(last_event)
+    }
+  }).on('move', function () {
+    const last_event = undo_stack.pop()
+    if (last_event.action === "drag") {
+      const event = {...last_event, action: "move"}
+      undo_stack.push(event)
+      document.getElementById('grid-undo').classList.remove('disabled-button')
+    }
+  })
   for (const spec of layout) {
     const el = document.querySelector(`[data-id="${spec.id}"]`);
     if (el && spec.width && spec.height) {
@@ -196,6 +211,28 @@
 
   // Set up reset, hide and resize actions
   {% if editable %}
+    const undo_stack = []
+  const undo_button = document.getElementById("grid-undo")
+  undo_button.addEventListener("click", function() {
+    const action = undo_stack.pop()
+    if (!action) {
+      return
+    }
+    if (undo_stack.length === 0) {
+      undo_button.classList.add('disabled-button')
+    }
+    switch(action.action) {
+      case "hide":
+        grid.show([action.item], {instant: true});
+      case "resize":
+        resize_item(action.item.getElement(), action.width, action.height, false);
+        grid.refreshItems()
+        grid.layout()
+      case "move":
+        grid.sort(action.items)
+    }
+  })
+
   const reset_button = document.getElementById("grid-reset")
   reset_button.addEventListener("click", function() {
     if (window.localStorage) {
@@ -209,7 +246,10 @@
 
   for (const handle of document.querySelectorAll('.muuri-handle.delete')) {
     handle.addEventListener("click", (event) => {
-      grid.hide([grid.getItem(event.target.parentElement)], {instant: true});
+      const item = grid.getItem(event.target.parentElement);
+      grid.hide([item], {instant: true});
+      undo_stack.push({action: "hide", item: item})
+      undo_button.classList.remove('disabled-button')
       {% if local_save %}
       document.getElementById('grid-save').classList.remove('disabled-button')
       {% endif %}
@@ -243,6 +283,24 @@
     // resize from all edges and corners
     edges: { right: '.muuri-handle.resize', bottom: '.muuri-handle.resize' },
     listeners: {
+      start (event) {
+        const el = event.target
+        const item = grid.getItem(el);
+        let height = el.style.height.slice(null, -2);
+        if (!height) {
+          const {top} = item.getMargin();
+          height = item.getHeight()-top;
+        } else {
+          height = parseFloat(height);
+        }
+        let width;
+        if (el.style.width.length) {
+          width = parseFloat(el.style.width.split('(')[1].split('%')[0]);
+        } else {
+          width = 100;
+        }
+        undo_stack.push({action: "resize", item, width, height})
+      },
       move (event) {
         const item = grid.getItem(event.target);
         const {top, bottom} = item.getMargin();
@@ -253,12 +311,14 @@
         resize_item(event.target, width, height, false);
         grid.refreshItems()
         grid.layout()
+        window.dispatchEvent(new Event('resize'));
       },
       end (event) {
         event.target.style.removeProperty('z-index')
         grid.refreshItems()
         grid.layout()
         window.dispatchEvent(new Event('resize'));
+        undo_button.classList.remove('disabled-button')
         {% if local_save %}
         save_button.classList.remove('disabled-button')
         {% endif %}
@@ -276,13 +336,14 @@
             const target = {range: 25}
             const grid_bbox = grid.getElement().getBoundingClientRect()
             for (const item of grid.getItems()) {
-              if (item === interaction.element) {
+              if ((item.getElement() === interaction.element) && item.isVisible()) {
                 continue
               }
               const {top, left} = item.getPosition();
               const margin = item.getMargin()
               const bottom = (top + item.getHeight()) + margin.top + margin.bottom;
               const right = (left + item.getWidth()) + margin.left + margin.right;
+
               if (Math.abs(right - x) < target.range) {
                 target.x = right + margin.right
               }

panel/tests/ui/template/test_editabletemplate.py

@@ -145,6 +145,24 @@ def test_editable_template_delete_item(page):
     wait_until(lambda: tmpl.layout.get(id(md2), {}).get('visible') == False, page)
 
 
+def test_editable_template_undo_delete_item(page):
+    tmpl = EditableTemplate()
+    md1 = Markdown('1')
+    md2 = Markdown('2')
+
+    tmpl.main[:] = [md1, md2]
+
+    serve_component(page, tmpl)
+
+    page.locator(".muuri-handle.delete").nth(1).click()
+
+    wait_until(lambda: tmpl.layout.get(id(md2), {}).get('visible') == False, page)
+
+    page.locator('#grid-undo').click()
+
+    wait_until(lambda: tmpl.layout.get(id(md2), {}).get('visible') == True, page)
+
+
 def test_editable_template_drag_item(page):
     tmpl = EditableTemplate()
     md1 = Markdown('1')
@@ -160,6 +178,24 @@ def test_editable_template_drag_item(page):
 
     wait_until(lambda: list(tmpl.layout) == [id(md2), id(md1)], page)
 
+def test_editable_template_undo_drag_item(page):
+    tmpl = EditableTemplate()
+    md1 = Markdown('1')
+    md2 = Markdown('2')
+
+    tmpl.main[:] = [md1, md2]
+
+    serve_component(page, tmpl)
+
+    md2_handle = page.locator(".muuri-handle.drag").nth(1)
+
+    md2_handle.drag_to(md2_handle, target_position={'x': 0, 'y': -50}, force=True)
+
+    wait_until(lambda: list(tmpl.layout) == [id(md2), id(md1)], page)
+
+    page.locator('#grid-undo').click()
+
+    wait_until(lambda: list(tmpl.layout) == [id(md1), id(md2)], page)
 
 def test_editable_template_resize_item(page):
     md1 = Markdown('1')
@@ -177,3 +213,24 @@ def test_editable_template_resize_item(page):
     md2_handle.drag_to(md2_handle, target_position={'x': -50, 'y': -30}, force=True)
 
     wait_until(lambda: tmpl.layout.get(id(md2), {}).get('width') < 45, page)
+
+def test_editable_template_undo_resize_item(page):
+    md1 = Markdown('1')
+    md2 = Markdown('2')
+
+    tmpl = EditableTemplate(layout={id(md2): {'width': 50, 'height': 80}})
+
+    tmpl.main[:] = [md1, md2]
+
+    serve_component(page, tmpl)
+
+    md2_handle = page.locator(".muuri-handle.resize").nth(1)
+
+    md2_handle.hover()
+    md2_handle.drag_to(md2_handle, target_position={'x': -50, 'y': -30}, force=True)
+
+    wait_until(lambda: tmpl.layout.get(id(md2), {}).get('width') < 45, page)
+
+    page.locator('#grid-undo').click()
+
+    wait_until(lambda: tmpl.layout.get(id(md2), {}).get('width') == 50, page)