bug: panel gap styling

packages/dockview-core/src/__tests__/splitview/splitview.spec.ts

@@ -772,4 +772,26 @@ describe('splitview', () => {
         view1.fireChangeEvent({ size: 300 });
         expect([view1.size, view2.size, view3.size]).toEqual([300, 300, 300]);
     });
+
+    test('that margins are applied to view sizing', () => {
+        const splitview = new Splitview(container, {
+            orientation: Orientation.HORIZONTAL,
+            proportionalLayout: false,
+            margin: 24,
+        });
+        splitview.layout(924, 500);
+
+        const view1 = new Testview(0, 1000);
+        const view2 = new Testview(0, 1000, LayoutPriority.High);
+        const view3 = new Testview(0, 1000);
+
+        splitview.addView(view1);
+        expect([view1.size]).toEqual([924]);
+
+        splitview.addView(view2);
+        expect([view1.size, view2.size]).toEqual([450, 450]); // 450 + 24 + 450  = 924
+
+        splitview.addView(view3);
+        expect([view1.size, view2.size, view3.size]).toEqual([292, 292, 292]); // 292 + 24 + 292 + 24 + 292 = 924
+    });
 });

packages/dockview-core/src/api/component.api.ts

@@ -870,4 +870,8 @@ export class DockviewApi implements CommonApi<SerializedDockview> {
     ): Promise<void> {
         return this.component.addPopoutGroup(item, options);
     }
+
+    setGap(gap: number | undefined): void {
+        this.component.updateOptions({ gap });
+    }
 }

packages/dockview-core/src/dockview/dockviewComponent.scss

@@ -14,41 +14,6 @@
     .dv-overlay-render-container {
         position: relative;
     }
-
-    .split-view-container {
-        &.horizontal {
-            > .view-container > .view {
-                &:not(:last-child) {
-                    .groupview {
-                        border-right: var(--dv-group-gap-size) solid transparent;
-                    }
-                }
-
-                &:not(:first-child) {
-                    .groupview {
-                        border-left: var(--dv-group-gap-size) solid transparent;
-                    }
-                }
-            }
-        }
-
-        &.vertical {
-            > .view-container > .view {
-                &:not(:last-child) {
-                    .groupview {
-                        border-bottom: var(--dv-group-gap-size) solid
-                            transparent;
-                    }
-                }
-
-                &:not(:first-child) {
-                    .groupview {
-                        border-top: var(--dv-group-gap-size) solid transparent;
-                    }
-                }
-            }
-        }
-    }
 }
 
 .groupview {

packages/dockview-core/src/dockview/dockviewComponent.ts

@@ -345,6 +345,7 @@ export class DockviewComponent
             parentElement: options.parentElement,
             disableAutoResizing: options.disableAutoResizing,
             locked: options.locked,
+            margin: options.gap,
         });
 
         const gready = document.createElement('div');
@@ -977,6 +978,14 @@ export class DockviewComponent
             this._rootDropTarget.setOverlayModel(options.rootOverlayModel!);
         }
 
+        if (this.gridview.margin !== 0 && options.gap === undefined) {
+            this.gridview.margin = 0;
+        }
+
+        if (typeof options.gap === 'number') {
+            this.gridview.margin = options.gap;
+        }
+
         this.layout(this.gridview.width, this.gridview.height, true);
     }
 

packages/dockview-core/src/dockview/options.ts

@@ -48,6 +48,7 @@ export interface DockviewOptions {
     rootOverlayModel?: DroptargetOverlayModel;
     locked?: boolean;
     disableDnd?: boolean;
+    gap?: number;
 }
 
 export interface DockviewDndOverlayEvent {
@@ -98,6 +99,7 @@ export const PROPERTY_KEYS: (keyof DockviewOptions)[] = (() => {
         rootOverlayModel: undefined,
         locked: undefined,
         disableDnd: undefined,
+        gap: undefined,
     };
 
     return Object.keys(properties) as (keyof DockviewOptions)[];

packages/dockview-core/src/gridview/baseComponentGridview.ts

@@ -35,6 +35,7 @@ export interface BaseGridOptions {
     readonly parentElement: HTMLElement;
     readonly disableAutoResizing?: boolean;
     readonly locked?: boolean;
+    readonly margin?: number;
 }
 
 export interface IGridPanelView extends IGridView, IPanel {
@@ -148,7 +149,9 @@ export abstract class BaseGrid<T extends IGridPanelView>
         this.gridview = new Gridview(
             !!options.proportionalLayout,
             options.styles,
-            options.orientation
+            options.orientation,
+            options.locked,
+            options.margin
         );
 
         this.gridview.locked = !!options.locked;

packages/dockview-core/src/gridview/branchNode.ts

@@ -139,6 +139,20 @@ export class BranchNode extends CompositeDisposable implements IView {
         this.splitview.disabled = value;
     }
 
+    get margin(): number {
+        return this.splitview.margin;
+    }
+
+    set margin(value: number) {
+        this.splitview.margin = value;
+
+        this.children.forEach((child) => {
+            if (child instanceof BranchNode) {
+                child.margin = value;
+            }
+        });
+    }
+
     constructor(
         readonly orientation: Orientation,
         readonly proportionalLayout: boolean,
@@ -146,6 +160,7 @@ export class BranchNode extends CompositeDisposable implements IView {
         size: number,
         orthogonalSize: number,
         disabled: boolean,
+        margin: number | undefined,
         childDescriptors?: INodeDescriptor[]
     ) {
         super();
@@ -160,6 +175,7 @@ export class BranchNode extends CompositeDisposable implements IView {
                 orientation: this.orientation,
                 proportionalLayout,
                 styles,
+                margin,
             });
             this.splitview.layout(this.size, this.orthogonalSize);
         } else {
@@ -184,6 +200,7 @@ export class BranchNode extends CompositeDisposable implements IView {
                 descriptor,
                 proportionalLayout,
                 styles,
+                margin,
             });
         }
 

packages/dockview-core/src/gridview/gridview.ts

@@ -42,7 +42,8 @@ function flipNode<T extends Node>(
             node.styles,
             size,
             orthogonalSize,
-            node.disabled
+            node.disabled,
+            node.margin
         );
 
         let totalSize = 0;
@@ -275,6 +276,7 @@ export class Gridview implements IDisposable {
 
     private _root: BranchNode | undefined;
     private _locked = false;
+    private _margin = 0;
     private _maximizedNode:
         | { leaf: LeafNode; hiddenOnMaximize: LeafNode[] }
         | undefined = undefined;
@@ -356,6 +358,15 @@ export class Gridview implements IDisposable {
         }
     }
 
+    get margin(): number {
+        return this._margin;
+    }
+
+    set margin(value: number) {
+        this._margin = value;
+        this.root.margin = value;
+    }
+
     maximizedView(): IGridView | undefined {
         return this._maximizedNode?.leaf.view;
     }
@@ -466,7 +477,8 @@ export class Gridview implements IDisposable {
             this.styles,
             this.root.size,
             this.root.orthogonalSize,
-            this._locked
+            this.locked,
+            this.margin
         );
     }
 
@@ -527,7 +539,8 @@ export class Gridview implements IDisposable {
                 this.styles,
                 node.size, // <- orthogonal size - flips at each depth
                 orthogonalSize, // <- size - flips at each depth,
-                this._locked,
+                this.locked,
+                this.margin,
                 children
             );
         } else {
@@ -580,7 +593,8 @@ export class Gridview implements IDisposable {
             this.styles,
             this.root.orthogonalSize,
             this.root.size,
-            this._locked
+            this.locked,
+            this.margin
         );
 
         if (oldRoot.children.length === 0) {
@@ -686,17 +700,24 @@ export class Gridview implements IDisposable {
     constructor(
         readonly proportionalLayout: boolean,
         readonly styles: ISplitviewStyles | undefined,
-        orientation: Orientation
+        orientation: Orientation,
+        locked?: boolean,
+        margin?: number
     ) {
         this.element = document.createElement('div');
         this.element.className = 'grid-view';
+
+        this._locked = locked ?? false;
+        this._margin = margin ?? 0;
+
         this.root = new BranchNode(
             orientation,
             proportionalLayout,
             styles,
             0,
             0,
-            this._locked
+            this.locked,
+            this.margin
         );
     }
 
@@ -781,7 +802,8 @@ export class Gridview implements IDisposable {
                 this.styles,
                 parent.size,
                 parent.orthogonalSize,
-                this._locked
+                this.locked,
+                this.margin
             );
             grandParent.addChild(newParent, parent.size, parentIndex);
 

packages/dockview-core/src/splitview/splitview.ts

@@ -36,6 +36,7 @@ export interface SplitViewOptions {
     readonly descriptor?: ISplitViewDescriptor;
     readonly proportionalLayout?: boolean;
     readonly styles?: ISplitviewStyles;
+    readonly margin?: number;
 }
 
 export enum LayoutPriority {
@@ -110,6 +111,7 @@ export class Splitview {
     private _startSnappingEnabled = true;
     private _endSnappingEnabled = true;
     private _disabled = false;
+    private _margin = 0;
 
     private readonly _onDidSashEnd = new Emitter<void>();
     readonly onDidSashEnd = this._onDidSashEnd.event;
@@ -211,6 +213,14 @@ export class Splitview {
         toggleClass(this.element, 'dv-splitview-disabled', value);
     }
 
+    get margin(): number {
+        return this._margin;
+    }
+
+    set margin(value: number) {
+        this._margin = value;
+    }
+
     constructor(
         private readonly container: HTMLElement,
         options: SplitViewOptions
@@ -218,6 +228,8 @@ export class Splitview {
         this._orientation = options.orientation;
         this.element = this.createContainer();
 
+        this.margin = options.margin ?? 0;
+
         this.proportionalLayout =
             options.proportionalLayout === undefined
                 ? true
@@ -785,18 +797,39 @@ export class Splitview {
         }
     }
 
+    /**
+     * Margin explain:
+     *
+     * For `n` views in a splitview there will be `n-1` margins `m`.
+     *
+     * To fit the margins each view must reduce in size by `(m * (n - 1)) / n`.
+     *
+     * For each view `i` the offet must be adjusted by `m * i/(n - 1)`.
+     */
     private layoutViews(): void {
         this._contentSize = this.viewItems.reduce((r, i) => r + i.size, 0);
-        let sum = 0;
-        const x: number[] = [];
 
         this.updateSashEnablement();
 
-        for (let i = 0; i < this.viewItems.length - 1; i++) {
+        if (this.viewItems.length === 0) {
-            sum += this.viewItems[i].size;
+            return;
-            x.push(sum);
+        }
 
-            const offset = Math.min(Math.max(0, sum - 2), this.size - 4);
+        const sashCount = this.viewItems.length - 1;
+        const marginReducedSize =
+            (this.margin * sashCount) / this.viewItems.length;
+
+        let totalLeftOffset = 0;
+        const viewLeftOffsets: number[] = [];
+
+        for (let i = 0; i < this.viewItems.length - 1; i++) {
+            totalLeftOffset += this.viewItems[i].size;
+            viewLeftOffsets.push(totalLeftOffset);
+
+            const offset = Math.min(
+                Math.max(0, totalLeftOffset - 2),
+                this.size - this.margin
+            );
 
             if (this._orientation === Orientation.HORIZONTAL) {
                 this.sashes[i].container.style.left = `${offset}px`;
@@ -808,20 +841,30 @@ export class Splitview {
             }
         }
         this.viewItems.forEach((view, i) => {
+            const size = view.size - marginReducedSize;
+            const offset =
+                i === 0
+                    ? 0
+                    : viewLeftOffsets[i - 1] +
+                      (i / sashCount) * marginReducedSize;
+
             if (this._orientation === Orientation.HORIZONTAL) {
-                view.container.style.width = `${view.size}px`;
+                view.container.style.width = `${size}px`;
-                view.container.style.left = i == 0 ? '0px' : `${x[i - 1]}px`;
+                view.container.style.left = `${offset}px`;
                 view.container.style.top = '';
                 view.container.style.height = '';
             }
             if (this._orientation === Orientation.VERTICAL) {
-                view.container.style.height = `${view.size}px`;
+                view.container.style.height = `${size}px`;
-                view.container.style.top = i == 0 ? '0px' : `${x[i - 1]}px`;
+                view.container.style.top = `${offset}px`;
                 view.container.style.width = '';
                 view.container.style.left = '';
             }
 
-            view.view.layout(view.size, this._orthogonalSize);
+            view.view.layout(
+                view.size - marginReducedSize,
+                this._orthogonalSize
+            );
         });
     }
 

packages/dockview-core/src/theme.scss

@@ -229,8 +229,6 @@
 }
 
 @mixin dockview-design-replit-mixin {
-    --dv-group-gap-size: 3px;
-
     .dv-resize-container:has(> .groupview) {
         border-radius: 8px;
     }

packages/dockview/src/__tests__/gridview/gridview.spec.tsx

@@ -12,7 +12,7 @@ describe('gridview react', () => {
     let components: Record<
         string,
         React.FunctionComponent<IGridviewPanelProps>
-    >
+    >;
 
     beforeEach(() => {
         components = {

packages/docs/sandboxes/react/dockview/demo-dockview/src/gridActions.tsx

@@ -51,6 +51,12 @@ export const GridActions = (props: {
         props.api?.addGroup();
     };
 
+    const [gap, setGap] = React.useState(0);
+
+    React.useEffect(() => {
+        props.api?.setGap(gap);
+    }, [gap, props.api]);
+
     return (
         <div className="action-container">
             <button className="text-button" onClick={() => onAddPanel()}>
@@ -89,6 +95,18 @@ export const GridActions = (props: {
             <button className="text-button" onClick={onReset}>
                 Reset
             </button>
+            <span style={{ flexGrow: 1 }} />
+            <div style={{ display: 'flex' }}>
+                <span style={{ paddingRight: '4px' }}>Gap</span>
+                <input
+                    type="number"
+                    min={0}
+                    max={20}
+                    step={1}
+                    value={gap}
+                    onChange={(event) => setGap(Number(event.target.value))}
+                />
+            </div>
         </div>
     );
 };