Allow to resize card in the grid with more precision

src/components/ha-grid-size-picker.ts

@@ -14,6 +14,12 @@ import {
 } from "../panels/lovelace/common/compute-card-grid-size";
 import { HomeAssistant } from "../types";
 
+declare global {
+  interface HASSDomEvents {
+    "grid-reset": undefined;
+  }
+}
+
 @customElement("ha-grid-size-picker")
 export class HaGridSizeEditor extends LitElement {
   @property({ attribute: false }) public hass!: HomeAssistant;
@@ -184,12 +190,7 @@ export class HaGridSizeEditor extends LitElement {
 
   private _reset(ev) {
     ev.stopPropagation();
-    fireEvent(this, "value-changed", {
+    fireEvent(this, "grid-reset");
-      value: {
-        rows: undefined,
-        columns: undefined,
-      },
-    });
   }
 
   private _sliderMoved(ev) {

src/panels/lovelace/common/compute-card-grid-size.ts

@@ -11,6 +11,8 @@ export type CardGridSize = {
   columns: number | "full";
 };
 
+export const GRID_COLUMN_MULTIPLIER = 3;
+
 export const computeCardGridSize = (
   options: LovelaceLayoutOptions
 ): CardGridSize => {
@@ -20,14 +22,16 @@ export const computeCardGridSize = (
   const maxRows = options.grid_max_rows;
   const minColumns = options.grid_min_columns;
   const maxColumns = options.grid_max_columns;
+  const precisionMode = options.grid_precision_mode;
 
   const clampedRows =
     typeof rows === "string" ? rows : conditionalClamp(rows, minRows, maxRows);
 
   const clampedColumns =
-    typeof columns === "string"
+    typeof columns === "string" || precisionMode
       ? columns
-      : conditionalClamp(columns, minColumns, maxColumns);
+      : conditionalClamp(columns, minColumns, maxColumns) *
+        GRID_COLUMN_MULTIPLIER;
 
   return {
     rows: clampedRows,

src/panels/lovelace/editor/card-editor/hui-card-layout-editor.ts

@@ -26,6 +26,7 @@ import { HuiCard } from "../../cards/hui-card";
 import {
   CardGridSize,
   computeCardGridSize,
+  GRID_COLUMN_MULTIPLIER,
 } from "../../common/compute-card-grid-size";
 import { LovelaceLayoutOptions } from "../../types";
 
@@ -57,11 +58,24 @@ export class HuiCardLayoutEditor extends LitElement {
     })
   );
 
-  private _computeCardGridSize = memoizeOne(computeCardGridSize);
+  private _computeCardGridSize = memoizeOne(
+    (options: LovelaceLayoutOptions) => {
+      const size = computeCardGridSize(options);
+      if (!options.grid_precision_mode) {
+        size.columns =
+          typeof size.columns === "number"
+            ? Math.round(size.columns / GRID_COLUMN_MULTIPLIER)
+            : size.columns;
+      }
+      return size;
+    }
+  );
 
   private _isDefault = memoizeOne(
     (options?: LovelaceLayoutOptions) =>
-      options?.grid_columns === undefined && options?.grid_rows === undefined
+      options?.grid_columns === undefined &&
+      options?.grid_rows === undefined &&
+      options?.grid_precision_mode === undefined
   );
 
   render() {
@@ -74,6 +88,8 @@ export class HuiCardLayoutEditor extends LitElement {
 
     const totalColumns = (this.sectionConfig.column_span ?? 1) * 4;
 
+    const precisionMode = options.grid_precision_mode ?? false;
+
     return html`
       <div class="header">
         <p class="intro">
@@ -135,20 +151,39 @@ export class HuiCardLayoutEditor extends LitElement {
             ></ha-yaml-editor>
           `
         : html`
+            ${precisionMode
+              ? html`
                   <ha-grid-size-picker
                     style=${styleMap({
-                "max-width": `${totalColumns * 45 + 50}px`,
+                      "max-width": `${totalColumns * 50 + 50}px`,
+                    })}
+                    .columns=${totalColumns * GRID_COLUMN_MULTIPLIER}
+                    .hass=${this.hass}
+                    .value=${value}
+                    .isDefault=${this._isDefault(this.config.layout_options)}
+                    @grid-reset=${this._reset}
+                    @value-changed=${this._gridSizeChanged}
+                    .rowMin=${options.grid_min_rows}
+                    .rowMax=${options.grid_max_rows}
+                  ></ha-grid-size-picker>
+                `
+              : html`
+                  <ha-grid-size-picker
+                    style=${styleMap({
+                      "max-width": `${totalColumns * 50 + 50}px`,
                     })}
                     .columns=${totalColumns}
                     .hass=${this.hass}
                     .value=${value}
                     .isDefault=${this._isDefault(this.config.layout_options)}
+                    @grid-reset=${this._reset}
                     @value-changed=${this._gridSizeChanged}
                     .rowMin=${options.grid_min_rows}
                     .rowMax=${options.grid_max_rows}
                     .columnMin=${options.grid_min_columns}
                     .columnMax=${options.grid_max_columns}
                   ></ha-grid-size-picker>
+                `}
             <ha-settings-row>
               <span slot="heading" data-for="full-width">
                 ${this.hass.localize(
@@ -167,6 +202,24 @@ export class HuiCardLayoutEditor extends LitElement {
               >
               </ha-switch>
             </ha-settings-row>
+            <ha-settings-row>
+              <span slot="heading" data-for="full-width">
+                ${this.hass.localize(
+                  "ui.panel.lovelace.editor.edit_card.layout.precision_mode"
+                )}
+              </span>
+              <span slot="description" data-for="full-width">
+                ${this.hass.localize(
+                  "ui.panel.lovelace.editor.edit_card.layout.precision_mode_helper"
+                )}
+              </span>
+              <ha-switch
+                @change=${this._precisionModeChanged}
+                .checked=${precisionMode}
+                name="full-precision_mode"
+              >
+              </ha-switch>
+            </ha-settings-row>
           `}
     `;
   }
@@ -211,9 +264,6 @@ export class HuiCardLayoutEditor extends LitElement {
       case 1:
         this._yamlMode = true;
         break;
-      case 2:
-        this._reset();
-        break;
     }
   }
 
@@ -275,6 +325,34 @@ export class HuiCardLayoutEditor extends LitElement {
     fireEvent(this, "value-changed", { value: newConfig });
   }
 
+  private _precisionModeChanged(ev): void {
+    ev.stopPropagation();
+    const value = ev.target.checked;
+
+    const preciseMode = value;
+    const gridColumns = this.config.layout_options?.grid_columns;
+
+    const newGridColumns =
+      typeof gridColumns === "number"
+        ? preciseMode
+          ? gridColumns * GRID_COLUMN_MULTIPLIER
+          : Math.round(gridColumns / GRID_COLUMN_MULTIPLIER)
+        : gridColumns;
+
+    const newConfig: LovelaceCardConfig = {
+      ...this.config,
+      layout_options: {
+        ...this.config.layout_options,
+        grid_columns: newGridColumns,
+        grid_precision_mode: preciseMode || undefined,
+      },
+    };
+    if (Object.keys(newConfig.layout_options!).length === 0) {
+      delete newConfig.layout_options;
+    }
+    fireEvent(this, "value-changed", { value: newConfig });
+  }
+
   static styles = [
     haStyle,
     css`

src/panels/lovelace/sections/hui-grid-section.ts

@@ -165,7 +165,7 @@ export class GridSection extends LitElement implements LovelaceSectionElement {
       haStyle,
       css`
         :host {
-          --base-column-count: 4;
+          --base-column-count: 12;
           --row-gap: var(--ha-section-grid-row-gap, 8px);
           --column-gap: var(--ha-section-grid-column-gap, 8px);
           --row-height: var(--ha-section-grid-row-height, 56px);
@@ -230,8 +230,8 @@ export class GridSection extends LitElement implements LovelaceSectionElement {
 
         .add {
           outline: none;
-          grid-row: span var(--row-size, 1);
+          grid-row: span 1;
-          grid-column: span var(--column-size, 2);
+          grid-column: span 6;
           background: none;
           cursor: pointer;
           border-radius: var(--ha-card-border-radius, 12px);

src/panels/lovelace/types.ts

@@ -49,6 +49,7 @@ export type LovelaceLayoutOptions = {
   grid_min_columns?: number;
   grid_min_rows?: number;
   grid_max_rows?: number;
+  grid_precision_mode?: boolean;
 };
 
 export interface LovelaceCard extends HTMLElement {

src/translations/en.json

@@ -5645,7 +5645,9 @@
             },
             "layout": {
               "full_width": "Full width card",
-              "full_width_helper": "Take up the full width of the section whatever its size"
+              "full_width_helper": "Take up the full width of the section whatever its size",
+              "precision_mode": "Precision mode",
+              "precision_mode_helper": "Change the card width with precision without limits"
             }
           },
           "edit_badge": {