Canvas: Add basic responsive design and layer editor UX (#40404)

public/app/features/canvas/runtime/element.tsx

@@ -6,12 +6,14 @@ import {
   CanvasElementItem,
   CanvasElementOptions,
   canvasElementRegistry,
+  Placement,
+  Anchor,
 } from 'app/features/canvas';
 import { DimensionContext } from 'app/features/dimensions';
 import { notFoundItem } from 'app/features/canvas/elements/notFound';
 import { GroupState } from './group';
 
-let counter = 100;
+let counter = 0;
 
 export class ElementState {
   readonly UID = counter++;
@@ -28,16 +30,82 @@ export class ElementState {
   height = 100;
   data?: any; // depends on the type
 
+  // From options, but always set and always valid
+  anchor: Anchor;
+  placement: Placement;
+
   constructor(public item: CanvasElementItem, public options: CanvasElementOptions, public parent?: GroupState) {
     if (!options) {
       this.options = { type: item.id };
     }
+    this.anchor = options.anchor ?? {};
+    this.placement = options.placement ?? {};
+    options.anchor = this.anchor;
+    options.placement = this.placement;
+  }
+
+  validatePlacement() {
+    const { anchor, placement } = this;
+    if (!(anchor.left || anchor.right)) {
+      anchor.left = true;
+    }
+    if (!(anchor.top || anchor.bottom)) {
+      anchor.top = true;
+    }
+
+    const w = placement.width ?? 100; // this.div ? this.div.clientWidth : this.width;
+    const h = placement.height ?? 100; // this.div ? this.div.clientHeight : this.height;
+
+    if (anchor.top) {
+      if (!placement.top) {
+        placement.top = 0;
+      }
+      if (anchor.bottom) {
+        delete placement.height;
+      } else {
+        placement.height = h;
+        delete placement.bottom;
+      }
+    } else if (anchor.bottom) {
+      if (!placement.bottom) {
+        placement.bottom = 0;
+      }
+      placement.height = h;
+      delete placement.top;
+    }
+
+    if (anchor.left) {
+      if (!placement.left) {
+        placement.left = 0;
+      }
+      if (anchor.right) {
+        delete placement.width;
+      } else {
+        placement.width = w;
+        delete placement.right;
+      }
+    } else if (anchor.right) {
+      if (!placement.right) {
+        placement.right = 0;
+      }
+      placement.width = w;
+      delete placement.left;
+    }
+
+    this.width = w;
+    this.height = h;
+
+    this.options.anchor = this.anchor;
+    this.options.placement = this.placement;
+
+    // console.log('validate', this.UID, this.item.id, this.placement, this.anchor);
   }
 
   // The parent size, need to set our own size based on offsets
   updateSize(width: number, height: number) {
     this.width = width;
     this.height = height;
+    this.validatePlacement();
 
     // Update the CSS position
     this.sizeStyle = {
@@ -129,33 +197,95 @@ export class ElementState {
 
   initElement = (target: HTMLDivElement) => {
     this.div = target;
-
-    let placement = this.options.placement;
-    if (!placement) {
-      placement = {
-        left: 0,
-        top: 0,
-      };
-      this.options.placement = placement;
-    }
   };
 
   applyDrag = (event: OnDrag) => {
-    const placement = this.options.placement;
-    placement!.top = event.top;
-    placement!.left = event.left;
+    const { placement, anchor } = this;
 
-    event.target.style.top = `${event.top}px`;
-    event.target.style.left = `${event.left}px`;
+    const deltaX = event.delta[0];
+    const deltaY = event.delta[1];
+
+    const style = event.target.style;
+    if (anchor.top) {
+      placement.top! += deltaY;
+      style.top = `${placement.top}px`;
+    }
+    if (anchor.bottom) {
+      placement.bottom! -= deltaY;
+      style.bottom = `${placement.bottom}px`;
+    }
+    if (anchor.left) {
+      placement.left! += deltaX;
+      style.left = `${placement.left}px`;
+    }
+    if (anchor.right) {
+      placement.right! -= deltaX;
+      style.right = `${placement.right}px`;
+    }
   };
 
+  // kinda like:
+  // https://github.com/grafana/grafana-edge-app/blob/main/src/panels/draw/WrapItem.tsx#L44
   applyResize = (event: OnResize) => {
-    const placement = this.options.placement;
-    placement!.height = event.height;
-    placement!.width = event.width;
+    const { placement, anchor } = this;
 
-    event.target.style.height = `${event.height}px`;
-    event.target.style.width = `${event.width}px`;
+    const style = event.target.style;
+    const deltaX = event.delta[0];
+    const deltaY = event.delta[1];
+    const dirLR = event.direction[0];
+    const dirTB = event.direction[1];
+    if (dirLR === 1) {
+      // RIGHT
+      if (anchor.right) {
+        placement.right! -= deltaX;
+        style.right = `${placement.right}px`;
+        if (!anchor.left) {
+          placement.width = event.width;
+          style.width = `${placement.width}px`;
+        }
+      } else {
+        placement.width! = event.width;
+        style.width = `${placement.width}px`;
+      }
+    } else if (dirLR === -1) {
+      // LEFT
+      if (anchor.left) {
+        placement.left! -= deltaX;
+        placement.width! = event.width;
+        style.left = `${placement.left}px`;
+        style.width = `${placement.width}px`;
+      } else {
+        placement.width! += deltaX;
+        style.width = `${placement.width}px`;
+      }
+    }
+
+    if (dirTB === -1) {
+      // TOP
+      if (anchor.top) {
+        placement.top! -= deltaY;
+        placement.height = event.height;
+        style.top = `${placement.top}px`;
+        style.height = `${placement.height}px`;
+      } else {
+        placement.height = event.height;
+        style.height = `${placement.height}px`;
+      }
+    } else if (dirTB === 1) {
+      // BOTTOM
+      if (anchor.bottom) {
+        placement.bottom! -= deltaY;
+        placement.height! = event.height;
+        style.bottom = `${placement.bottom}px`;
+        style.height = `${placement.height}px`;
+      } else {
+        placement.height! = event.height;
+        style.height = `${placement.height}px`;
+      }
+    }
+
+    this.width = event.width;
+    this.height = event.height;
   };
 
   render() {

public/app/features/canvas/runtime/group.tsx

@@ -4,6 +4,8 @@ import { DimensionContext } from 'app/features/dimensions';
 import { notFoundItem } from 'app/features/canvas/elements/notFound';
 import { ElementState } from './element';
 import { CanvasElementItem } from '../element';
+import { LayerActionID } from 'app/plugins/panel/canvas/types';
+import { cloneDeep } from 'lodash';
 
 export const groupItemDummy: CanvasElementItem = {
   id: 'group',
@@ -19,7 +21,7 @@ export const groupItemDummy: CanvasElementItem = {
 };
 
 export class GroupState extends ElementState {
-  readonly elements: ElementState[] = [];
+  elements: ElementState[] = [];
 
   constructor(public options: CanvasGroupOptions, public parent?: GroupState) {
     super(groupItemDummy, options, parent);
@@ -35,14 +37,24 @@ export class GroupState extends ElementState {
         this.elements.push(new GroupState(c as CanvasGroupOptions, this));
       } else {
         const item = canvasElementRegistry.getIfExists(c.type) ?? notFoundItem;
-        this.elements.push(new ElementState(item, c, parent));
+        this.elements.push(new ElementState(item, c, this));
       }
     }
   }
 
+  isRoot() {
+    return false;
+  }
+
   // The parent size, need to set our own size based on offsets
   updateSize(width: number, height: number) {
     super.updateSize(width, height);
+    if (!this.parent) {
+      this.width = width;
+      this.height = height;
+      this.sizeStyle.width = width;
+      this.sizeStyle.height = height;
+    }
 
     // Update children with calculated size
     for (const elem of this.elements) {
@@ -62,6 +74,54 @@ export class GroupState extends ElementState {
     }
   }
 
+  // used in the layer editor
+  reorder(startIndex: number, endIndex: number) {
+    const result = Array.from(this.elements);
+    const [removed] = result.splice(startIndex, 1);
+    result.splice(endIndex, 0, removed);
+    this.elements = result;
+    this.onChange(this.getSaveModel());
+  }
+
+  // ??? or should this be on the element directly?
+  // are actions scoped to layers?
+  doAction = (action: LayerActionID, element: ElementState) => {
+    switch (action) {
+      case LayerActionID.Delete:
+        this.elements = this.elements.filter((e) => e !== element);
+        break;
+      case LayerActionID.Duplicate:
+        if (element.item.id === 'group') {
+          console.log('Can not duplicate groups (yet)', action, element);
+          return;
+        }
+        const opts = cloneDeep(element.options);
+        if (element.anchor.top) {
+          opts.placement!.top! += 10;
+        }
+        if (element.anchor.left) {
+          opts.placement!.left! += 10;
+        }
+        if (element.anchor.bottom) {
+          opts.placement!.bottom! += 10;
+        }
+        if (element.anchor.right) {
+          opts.placement!.right! += 10;
+        }
+        console.log('DUPLICATE', opts);
+        const copy = new ElementState(element.item, opts, this);
+        copy.updateSize(element.width, element.height);
+        copy.updateData(element.data); // :bomb:  <-- need some way to tell the scene to re-init size and data
+        this.elements.push(copy);
+        break;
+      default:
+        console.log('DO action', action, element);
+        return;
+    }
+
+    this.onChange(this.getSaveModel());
+  };
+
   render() {
     return (
       <div key={`${this.UID}/${this.revId}`} style={{ ...this.sizeStyle, ...this.dataStyle }}>

public/app/features/canvas/runtime/root.tsx

@@ -0,0 +1,37 @@
+import { CanvasGroupOptions, CanvasElementOptions } from 'app/features/canvas';
+import { GroupState } from './group';
+
+export class RootElement extends GroupState {
+  constructor(public options: CanvasGroupOptions, private changeCallback: () => void) {
+    super(options);
+  }
+
+  isRoot() {
+    return true;
+  }
+
+  // The parent size is always fullsize
+  updateSize(width: number, height: number) {
+    super.updateSize(width, height);
+    this.width = width;
+    this.height = height;
+    this.sizeStyle.width = width;
+    this.sizeStyle.height = height;
+  }
+
+  // root type can not change
+  onChange(options: CanvasElementOptions) {
+    this.revId++;
+    this.options = { ...options } as CanvasGroupOptions;
+    this.changeCallback();
+  }
+
+  getSaveModel() {
+    const { placement, anchor, ...rest } = this.options;
+
+    return {
+      ...rest, // everything except placement & anchor
+      elements: this.elements.map((v) => v.getSaveModel()),
+    } as CanvasGroupOptions;
+  }
+}

public/app/features/canvas/runtime/scene.tsx

@@ -1,13 +1,19 @@
 import React, { CSSProperties } from 'react';
 import { css } from '@emotion/css';
-import { ReplaySubject } from 'rxjs';
+import { ReplaySubject, Subject } from 'rxjs';
 import Moveable from 'moveable';
 import Selecto from 'selecto';
 
 import { config } from 'app/core/config';
 import { GrafanaTheme2, PanelData } from '@grafana/data';
 import { stylesFactory } from '@grafana/ui';
-import { CanvasElementOptions, CanvasGroupOptions, DEFAULT_CANVAS_ELEMENT_CONFIG } from 'app/features/canvas';
+import {
+  Anchor,
+  CanvasElementOptions,
+  CanvasGroupOptions,
+  DEFAULT_CANVAS_ELEMENT_CONFIG,
+  Placement,
+} from 'app/features/canvas';
 import {
   ColorDimensionConfig,
   ResourceDimensionConfig,
@@ -21,20 +27,23 @@ import {
   getResourceDimensionFromData,
   getTextDimensionFromData,
 } from 'app/features/dimensions/utils';
-import { GroupState } from './group';
 import { ElementState } from './element';
+import { RootElement } from './root';
 
 export class Scene {
-  private root: GroupState;
   private lookup = new Map<number, ElementState>();
   styles = getStyles(config.theme2);
-  readonly selected = new ReplaySubject<ElementState | undefined>(undefined);
+  readonly selection = new ReplaySubject<ElementState[]>(1);
+  readonly moved = new Subject<number>(); // called after resize/drag for editor updates
+  root: RootElement;
+
   revId = 0;
 
   width = 0;
   height = 0;
   style: CSSProperties = {};
   data?: PanelData;
+  selecto?: Selecto | null;
 
   constructor(cfg: CanvasGroupOptions, public onSave: (cfg: CanvasGroupOptions) => void) {
     this.root = this.load(cfg);
@@ -42,23 +51,20 @@ export class Scene {
 
   load(cfg: CanvasGroupOptions) {
     console.log('LOAD', cfg, this);
-    this.root = new GroupState(
+    this.root = new RootElement(
       cfg ?? {
         type: 'group',
         elements: [DEFAULT_CANVAS_ELEMENT_CONFIG],
-      }
+      },
+      this.save // callback when changes are made
     );
 
     // Build the scene registry
     this.lookup.clear();
     this.root.visit((v) => {
       this.lookup.set(v.UID, v);
-
-      // HACK! select the first/only item
-      if (v.item.id !== 'group') {
-        this.selected.next(v);
-      }
     });
+
     return this.root;
   }
 
@@ -92,10 +98,47 @@ export class Scene {
     this.save();
   }
 
-  save() {
-    this.onSave(this.root.getSaveModel());
+  toggleAnchor(element: ElementState, k: keyof Anchor) {
+    console.log('TODO, smarter toggle', element.UID, element.anchor, k);
+    const { div } = element;
+    if (!div) {
+      console.log('Not ready');
+      return;
+    }
+
+    const w = element.parent?.width ?? 100;
+    const h = element.parent?.height ?? 100;
+
+    // Get computed position....
+    const info = div.getBoundingClientRect(); // getElementInfo(div, element.parent?.div);
+    console.log('DIV info', div);
+
+    const placement: Placement = {
+      top: info.top,
+      left: info.left,
+      width: info.width,
+      height: info.height,
+      bottom: h - info.bottom,
+      right: w - info.right,
+    };
+
+    console.log('PPP', placement);
+
+    // // TODO: needs to recalculate placement based on absolute values...
+    // element.anchor[k] = !Boolean(element.anchor[k]);
+    // element.placement = placement;
+    // element.validatePlacement();
+    // element.revId++;
+    // this.revId++;
+    //    this.save();
+
+    this.moved.next(Date.now());
   }
 
+  save = () => {
+    this.onSave(this.root.getSaveModel());
+  };
+
   private findElementByTarget = (target: HTMLElement | SVGElement): ElementState | undefined => {
     return this.root.elements.find((element) => element.div === target);
   };
@@ -106,9 +149,10 @@ export class Scene {
       targetElements.push(element.div!);
     });
 
-    const selecto = new Selecto({
+    this.selecto = new Selecto({
       container: sceneContainer,
       selectableTargets: targetElements,
+      selectByClick: true,
     });
 
     const moveable = new Moveable(sceneContainer, {
@@ -116,63 +160,67 @@ export class Scene {
       resizable: true,
     })
       .on('clickGroup', (event) => {
-        selecto.clickTarget(event.inputEvent, event.inputTarget);
+        this.selecto!.clickTarget(event.inputEvent, event.inputTarget);
       })
       .on('drag', (event) => {
         const targetedElement = this.findElementByTarget(event.target);
         targetedElement!.applyDrag(event);
+        this.moved.next(Date.now()); // TODO only on end
       })
       .on('dragGroup', (e) => {
         e.events.forEach((event) => {
           const targetedElement = this.findElementByTarget(event.target);
           targetedElement!.applyDrag(event);
         });
+        this.moved.next(Date.now()); // TODO only on end
       })
       .on('resize', (event) => {
         const targetedElement = this.findElementByTarget(event.target);
         targetedElement!.applyResize(event);
+        this.moved.next(Date.now()); // TODO only on end
       })
       .on('resizeGroup', (e) => {
         e.events.forEach((event) => {
           const targetedElement = this.findElementByTarget(event.target);
           targetedElement!.applyResize(event);
         });
+        this.moved.next(Date.now()); // TODO only on end
       });
 
     let targets: Array<HTMLElement | SVGElement> = [];
-    selecto
-      .on('dragStart', (event) => {
-        const selectedTarget = event.inputEvent.target;
+    this.selecto!.on('dragStart', (event) => {
+      const selectedTarget = event.inputEvent.target;
 
-        const isTargetMoveableElement =
-          moveable.isMoveableElement(selectedTarget) ||
-          targets.some((target) => target === selectedTarget || target.contains(selectedTarget));
+      const isTargetMoveableElement =
+        moveable.isMoveableElement(selectedTarget) ||
+        targets.some((target) => target === selectedTarget || target.contains(selectedTarget));
 
-        if (isTargetMoveableElement) {
-          // Prevent drawing selection box when selected target is a moveable element
-          event.stop();
-        }
-      })
-      .on('selectEnd', (event) => {
-        targets = event.selected;
-        moveable.target = targets;
+      if (isTargetMoveableElement) {
+        // Prevent drawing selection box when selected target is a moveable element
+        event.stop();
+      }
+    }).on('selectEnd', (event) => {
+      targets = event.selected;
+      moveable.target = targets;
 
-        if (event.isDragStart) {
-          event.inputEvent.preventDefault();
+      const s = event.selected.map((t) => this.findElementByTarget(t)!);
+      this.selection.next(s);
+      console.log('UPDATE selection', s);
 
-          setTimeout(() => {
-            moveable.dragStart(event.inputEvent);
-          });
-        }
-      });
+      if (event.isDragStart) {
+        event.inputEvent.preventDefault();
+
+        setTimeout(() => {
+          moveable.dragStart(event.inputEvent);
+        });
+      }
+    });
   };
 
   render() {
     return (
-      <div>
-        <div key={this.revId} className={this.styles.wrap} style={this.style} ref={this.initMoveable}>
-          {this.root.render()}
-        </div>
+      <div key={this.revId} className={this.styles.wrap} style={this.style} ref={this.initMoveable}>
+        {this.root.render()}
       </div>
     );
   }

public/app/plugins/panel/canvas/CanvasPanel.tsx

@@ -7,6 +7,7 @@ import { CanvasGroupOptions } from 'app/features/canvas';
 import { Scene } from 'app/features/canvas/runtime/scene';
 import { PanelContext, PanelContextRoot } from '@grafana/ui';
 import { ElementState } from 'app/features/canvas/runtime/element';
+import { GroupState } from 'app/features/canvas/runtime/group';
 
 interface Props extends PanelProps<PanelOptions> {}
 
@@ -16,7 +17,8 @@ interface State {
 
 export interface InstanceState {
   scene: Scene;
-  selected?: ElementState;
+  selected: ElementState[];
+  layer: GroupState;
 }
 
 export class CanvasPanel extends Component<Props, State> {
@@ -53,14 +55,16 @@ export class CanvasPanel extends Component<Props, State> {
     if (this.panelContext.onInstanceStateChange && this.panelContext.app === CoreApp.PanelEditor) {
       this.panelContext.onInstanceStateChange({
         scene: this.scene,
+        layer: this.scene.root,
       });
 
       this.subs.add(
-        this.scene.selected.subscribe({
+        this.scene.selection.subscribe({
           next: (v) => {
             this.panelContext.onInstanceStateChange!({
               scene: this.scene,
               selected: v,
+              layer: this.scene.root,
             });
           },
         })

public/app/plugins/panel/canvas/editor/LayerElementListEditor.tsx

@@ -0,0 +1,206 @@
+import React, { PureComponent } from 'react';
+import { css, cx } from '@emotion/css';
+import { Button, Container, Icon, IconButton, stylesFactory, ValuePicker } from '@grafana/ui';
+import { GrafanaTheme, SelectableValue, StandardEditorProps } from '@grafana/data';
+import { config } from '@grafana/runtime';
+import { DragDropContext, Droppable, Draggable, DropResult } from 'react-beautiful-dnd';
+
+import { PanelOptions } from '../models.gen';
+import { InstanceState } from '../CanvasPanel';
+import { LayerActionID } from '../types';
+import { canvasElementRegistry } from 'app/features/canvas';
+
+type Props = StandardEditorProps<any, InstanceState, PanelOptions>;
+
+export class LayerElementListEditor extends PureComponent<Props> {
+  style = getStyles(config.theme);
+
+  onAddItem = (sel: SelectableValue<string>) => {
+    // const reg = drawItemsRegistry.getIfExists(sel.value);
+    // if (!reg) {
+    //   console.error('NOT FOUND', sel);
+    //   return;
+    // }
+    // const layer = this.props.value;
+    // const item = newItem(reg, layer.items.length);
+    // const isList = this.props.context.options?.mode === LayoutMode.List;
+    // const items = isList ? [item, ...layer.items] : [...layer.items, item];
+    // this.props.onChange({
+    //   ...layer,
+    //   items,
+    // });
+    // this.onSelect(item);
+  };
+
+  onSelect = (item: any) => {
+    const { settings } = this.props.item;
+
+    if (settings?.scene && settings?.scene?.selecto) {
+      settings.scene.selecto.clickTarget(item, item?.div);
+    }
+  };
+
+  getRowStyle = (sel: boolean) => {
+    return sel ? `${this.style.row} ${this.style.sel}` : this.style.row;
+  };
+
+  onDragEnd = (result: DropResult) => {
+    if (!result.destination) {
+      return;
+    }
+
+    const { settings } = this.props.item;
+    if (!settings?.layer) {
+      return;
+    }
+
+    const { layer } = settings;
+
+    const count = layer.elements.length - 1;
+    const src = (result.source.index - count) * -1;
+    const dst = (result.destination.index - count) * -1;
+
+    layer.reorder(src, dst);
+  };
+
+  render() {
+    const settings = this.props.item.settings;
+    if (!settings) {
+      return <div>No settings</div>;
+    }
+    const layer = settings.layer;
+    if (!layer) {
+      return <div>Missing layer?</div>;
+    }
+
+    const styles = this.style;
+    const selection: number[] = settings.selected ? settings.selected.map((v) => v.UID) : [];
+    return (
+      <>
+        <DragDropContext onDragEnd={this.onDragEnd}>
+          <Droppable droppableId="droppable">
+            {(provided, snapshot) => (
+              <div {...provided.droppableProps} ref={provided.innerRef}>
+                {(() => {
+                  // reverse order
+                  const rows: any = [];
+                  for (let i = layer.elements.length - 1; i >= 0; i--) {
+                    const element = layer.elements[i];
+                    rows.push(
+                      <Draggable key={element.UID} draggableId={`${element.UID}`} index={rows.length}>
+                        {(provided, snapshot) => (
+                          <div
+                            className={this.getRowStyle(selection.includes(element.UID))}
+                            ref={provided.innerRef}
+                            {...provided.draggableProps}
+                            {...provided.dragHandleProps}
+                            onMouseDown={() => this.onSelect(element)}
+                          >
+                            <span className={styles.typeWrapper}>{element.item.name}</span>
+                            <div className={styles.textWrapper}>
+                              &nbsp; {element.UID} ({i})
+                            </div>
+
+                            <IconButton
+                              name="copy"
+                              title={'duplicate'}
+                              className={styles.actionIcon}
+                              onClick={() => layer.doAction(LayerActionID.Duplicate, element)}
+                              surface="header"
+                            />
+
+                            <IconButton
+                              name="trash-alt"
+                              title={'remove'}
+                              className={cx(styles.actionIcon, styles.dragIcon)}
+                              onClick={() => layer.doAction(LayerActionID.Delete, element)}
+                              surface="header"
+                            />
+                            <Icon
+                              title="Drag and drop to reorder"
+                              name="draggabledots"
+                              size="lg"
+                              className={styles.dragIcon}
+                            />
+                          </div>
+                        )}
+                      </Draggable>
+                    );
+                  }
+                  return rows;
+                })()}
+
+                {provided.placeholder}
+              </div>
+            )}
+          </Droppable>
+        </DragDropContext>
+        <br />
+
+        <Container>
+          <ValuePicker
+            icon="plus"
+            label="Add item"
+            variant="secondary"
+            options={canvasElementRegistry.selectOptions().options}
+            onChange={this.onAddItem}
+            isFullWidth={false}
+          />
+          {selection.length > 0 && (
+            <Button size="sm" variant="secondary" onClick={() => console.log('TODO!')}>
+              Clear Selection
+            </Button>
+          )}
+        </Container>
+      </>
+    );
+  }
+}
+
+const getStyles = stylesFactory((theme: GrafanaTheme) => ({
+  wrapper: css`
+    margin-bottom: ${theme.spacing.md};
+  `,
+  row: css`
+    padding: ${theme.spacing.xs} ${theme.spacing.sm};
+    border-radius: ${theme.border.radius.sm};
+    background: ${theme.colors.bg2};
+    min-height: ${theme.spacing.formInputHeight}px;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    margin-bottom: 3px;
+    cursor: pointer;
+
+    border: 1px solid ${theme.colors.formInputBorder};
+    &:hover {
+      border: 1px solid ${theme.colors.formInputBorderHover};
+    }
+  `,
+  sel: css`
+    border: 1px solid ${theme.colors.formInputBorderActive};
+    &:hover {
+      border: 1px solid ${theme.colors.formInputBorderActive};
+    }
+  `,
+  dragIcon: css`
+    cursor: drag;
+  `,
+  actionIcon: css`
+    color: ${theme.colors.textWeak};
+    &:hover {
+      color: ${theme.colors.text};
+    }
+  `,
+  typeWrapper: css`
+    color: ${theme.colors.textBlue};
+    margin-right: 5px;
+  `,
+  textWrapper: css`
+    display: flex;
+    align-items: center;
+    flex-grow: 1;
+    overflow: hidden;
+    margin-right: ${theme.spacing.sm};
+  `,
+}));

public/app/plugins/panel/canvas/editor/PlacementEditor.tsx

@@ -0,0 +1,66 @@
+import React, { FC } from 'react';
+import { Button, Field, HorizontalGroup, InlineField, InlineFieldRow } from '@grafana/ui';
+import { StandardEditorProps } from '@grafana/data';
+
+import { PanelOptions } from '../models.gen';
+import { useObservable } from 'react-use';
+import { Subject } from 'rxjs';
+import { CanvasEditorOptions } from './elementEditor';
+import { Anchor, Placement } from 'app/features/canvas';
+import { NumberInput } from 'app/features/dimensions/editors/NumberInput';
+
+const anchors: Array<keyof Anchor> = ['top', 'left', 'bottom', 'right'];
+const places: Array<keyof Placement> = ['top', 'left', 'bottom', 'right', 'width', 'height'];
+
+export const PlacementEditor: FC<StandardEditorProps<any, CanvasEditorOptions, PanelOptions>> = ({ item }) => {
+  const settings = item.settings;
+
+  // Will force a rerender whenever the subject changes
+  useObservable(settings?.scene ? settings.scene.moved : new Subject());
+
+  if (!settings) {
+    return <div>Loading...</div>;
+  }
+
+  const element = settings.element;
+  if (!element) {
+    return <div>???</div>;
+  }
+  const { placement } = element;
+
+  return (
+    <div>
+      <HorizontalGroup>
+        {anchors.map((a) => (
+          <Button
+            key={a}
+            size="sm"
+            variant={element.anchor[a] ? 'primary' : 'secondary'}
+            onClick={() => settings.scene.toggleAnchor(element, a)}
+          >
+            {a}
+          </Button>
+        ))}
+      </HorizontalGroup>
+      <br />
+
+      <Field label="Position">
+        <>
+          {places.map((p) => {
+            const v = placement[p];
+            if (v == null) {
+              return null;
+            }
+            return (
+              <InlineFieldRow key={p}>
+                <InlineField label={p} labelWidth={8} grow={true}>
+                  <NumberInput value={v} onChange={(v) => console.log('TODO, edit!!!', p, v)} />
+                </InlineField>
+              </InlineFieldRow>
+            );
+          })}
+        </>
+      </Field>
+    </div>
+  );
+};

public/app/plugins/panel/canvas/editor/elementEditor.tsx

@@ -5,6 +5,7 @@ import { NestedPanelOptions, NestedValueAccess } from '@grafana/data/src/utils/O
 import { setOptionImmutably } from 'app/features/dashboard/components/PanelEditor/utils';
 import { ElementState } from 'app/features/canvas/runtime/element';
 import { Scene } from 'app/features/canvas/runtime/scene';
+import { PlacementEditor } from './PlacementEditor';
 
 export interface CanvasEditorOptions {
   element: ElementState;
@@ -44,6 +45,8 @@ export function getElementEditor(opts: CanvasEditorOptions): NestedPanelOptions<
 
     // Dynamically fill the selected element
     build: (builder, context) => {
+      console.log('MAKE element editor', opts.element.UID);
+
       const { options } = opts.element;
       const layerTypes = canvasElementRegistry.selectOptions(
         options?.type // the selected value
@@ -70,6 +73,15 @@ export function getElementEditor(opts: CanvasEditorOptions): NestedPanelOptions<
 
       optionBuilder.addBackground(builder, ctx);
       optionBuilder.addBorder(builder, ctx);
+
+      builder.addCustomEditor({
+        category: ['Layout'],
+        id: 'content',
+        path: '__', // not used
+        name: 'Anchor',
+        editor: PlacementEditor,
+        settings: opts,
+      });
     },
   };
 }

public/app/plugins/panel/canvas/editor/layerEditor.tsx

@@ -0,0 +1,56 @@
+import { get as lodashGet } from 'lodash';
+import { optionBuilder } from './options';
+import { NestedPanelOptions, NestedValueAccess } from '@grafana/data/src/utils/OptionsUIBuilders';
+import { setOptionImmutably } from 'app/features/dashboard/components/PanelEditor/utils';
+import { InstanceState } from '../CanvasPanel';
+import { LayerElementListEditor } from './LayerElementListEditor';
+
+export function getLayerEditor(opts: InstanceState): NestedPanelOptions<InstanceState> {
+  const { layer, scene } = opts;
+  const options = layer.options || { elements: [] };
+
+  return {
+    category: ['Layer'],
+    path: '--', // not used!
+
+    // Note that canvas editor writes things to the scene!
+    values: (parent: NestedValueAccess) => ({
+      getValue: (path: string) => {
+        return lodashGet(options, path);
+      },
+      onChange: (path: string, value: any) => {
+        if (path === 'type' && value) {
+          console.warn('unable to change layer type');
+          return;
+        }
+        const c = setOptionImmutably(options, path, value);
+        scene.onChange(layer.UID, c);
+      },
+    }),
+
+    // Dynamically fill the selected element
+    build: (builder, context) => {
+      console.log('MAKE layer editor', layer.UID);
+
+      builder.addCustomEditor({
+        id: 'content',
+        path: 'root',
+        name: 'Elements',
+        editor: LayerElementListEditor,
+        settings: opts,
+      });
+
+      // // force clean layer configuration
+      // const layer = canvasElementRegistry.getIfExists(options?.type ?? DEFAULT_CANVAS_ELEMENT_CONFIG.type)!;
+      //const currentOptions = { ...options, type: layer.id, config: { ...layer.defaultConfig, ...options?.config } };
+      const ctx = { ...context, options };
+
+      // if (layer.registerOptionsUI) {
+      //   layer.registerOptionsUI(builder, ctx);
+      // }
+
+      optionBuilder.addBackground(builder as any, ctx);
+      optionBuilder.addBorder(builder as any, ctx);
+    },
+  };
+}

public/app/plugins/panel/canvas/module.tsx

@@ -3,6 +3,7 @@ import { PanelPlugin } from '@grafana/data';
 import { CanvasPanel, InstanceState } from './CanvasPanel';
 import { PanelOptions } from './models.gen';
 import { getElementEditor } from './editor/elementEditor';
+import { getLayerEditor } from './editor/layerEditor';
 
 export const plugin = new PanelPlugin<PanelOptions>(CanvasPanel)
   .setNoPadding() // extend to panel edges
@@ -17,13 +18,20 @@ export const plugin = new PanelPlugin<PanelOptions>(CanvasPanel)
       defaultValue: true,
     });
 
-    if (state?.selected) {
-      builder.addNestedOptions(
-        getElementEditor({
-          category: ['Selected element'],
-          element: state.selected,
-          scene: state.scene,
-        })
-      );
+    if (state) {
+      const selection = state.selected;
+      if (selection?.length === 1) {
+        builder.addNestedOptions(
+          getElementEditor({
+            category: [`Selected element (id: ${selection[0].UID})`], // changing the ID forces are reload
+            element: selection[0],
+            scene: state.scene,
+          })
+        );
+      } else {
+        console.log('NO Single seleciton', selection?.length);
+      }
+
+      builder.addNestedOptions(getLayerEditor(state));
     }
   });

public/app/plugins/panel/canvas/types.ts

@@ -0,0 +1,6 @@
+export enum LayerActionID {
+  Delete = 'delete',
+  Duplicate = 'duplicate',
+  MoveTop = 'move-top',
+  MoveBottom = 'move-bottom',
+}