gristlabs_grist-core/app/client/components/LayoutTray.ts

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import BaseView from 'app/client/components/BaseView';
import {buildCollapsedSectionDom, buildViewSectionDom} from 'app/client/components/buildViewSectionDom';
import * as commands from 'app/client/components/commands';
import {ContentBox} from 'app/client/components/Layout';
import type {ViewLayout} from 'app/client/components/ViewLayout';
import {get as getBrowserGlobals} from 'app/client/lib/browserGlobals';
import {detachNode} from 'app/client/lib/dom';
import {Signal} from 'app/client/lib/Signal';
import {urlState} from 'app/client/models/gristUrlState';
import {TransitionWatcher} from 'app/client/ui/transitions';
import {theme} from 'app/client/ui2018/cssVars';
import {DisposableWithEvents} from 'app/common/DisposableWithEvents';
import {isNonNullish} from 'app/common/gutil';
import {Computed, Disposable, dom, IDisposable, IDisposableOwner,
makeTestId, obsArray, Observable, styled} from 'grainjs';
import isEqual from 'lodash/isEqual';
const testId = makeTestId('test-layoutTray-');
const G = getBrowserGlobals('document', 'window', '$');
/**
* Adds a tray for minimizing and restoring sections. It is built as a plugin for the ViewLayout component.
*/
export class LayoutTray extends DisposableWithEvents {
// We and LayoutEditor will emit this event with the box that is being dragged. When the
// drag is over there will be another event with null.
public drag = Signal.create<Dropped|null>(this, null);
// Event for dropping, contains a dropped element.
public drop = Signal.create<Dropped|null>(this, null);
// Monitor if the cursor is over the our tray.
public hovering = Signal.create(this, false);
// If the drag is active and the mouse is over the tray make a signal..
public over = Signal.compute(this, on => Boolean(on(this.drag) && on(this.hovering)));
// Mouse events during dragging (without a state).
public dragging = Signal.create<MouseEvent|null>(this, null);
// Create a layout to actually render the collapsed sections.
public layout = CollapsedLayout.create(this, this);
// Whether we are active (have a dotted border, that indicates we are ready to receive a drop)
public active = Signal.create(this, false);
private _rootElement: HTMLElement;
constructor(public viewLayout: ViewLayout) {
super();
// Create a proxy for the LayoutEditor. It will mimic the same interface as CollapsedLeaf.
const externalLeaf = ExternalLeaf.create(this, this);
// Build layout using saved settings.
this.layout.buildLayout(this.viewLayout.viewModel.collapsedSections.peek());
this._registerCommands();
// Override the drop event, to detect if we are dropped on the tray, and no one else
// gets the value.
this.drop.before((value, emit) => {
// Emit the value, if someone else will handle it, he should grab the state from it.
emit(value);
// See if the state is still there.
if (value && this.drop.state.get()) {
// No one took it, so we should handle it if we are over the tray.
if (this.over.state.get()) {
const leafId = value.leafId();
// Add it as a last element.
this.layout.addBox(leafId);
// Ask it to remove itself from the target.
value.removeFromLayout();
}
}
// Clear the state, any other listener will get null.
this.drop.state.set(null);
});
// Now wire up active state.
// When a drag is started, get the top point of the tray, over which we will activate.
let topPoint = 48; // By default it is 48 pixels.
this.autoDispose(externalLeaf.drag.listen(d => {
if (!d) { return; }
topPoint = (this._rootElement.parentElement?.getBoundingClientRect().top ?? 61) - 13;
}));
// First we can be activated when a drag has started and we have some boxes.
this.drag.map(drag => drag && this.layout.count.get() > 0)
.flag() // Map to a boolean, and emit only when the value changes.
.filter(Boolean) // Only emit when it is set to true
.pipe(this.active);
// Second, we can be activated when the drag has started by the main layout, and we don't have any boxes yet, but
// mouse pointer is relatively high on the screen.
Signal.compute(this, on => {
const drag = on(externalLeaf.drag);
if (!drag) { return false; }
const mouseEvent = on(externalLeaf.dragMove);
const over = mouseEvent && mouseEvent.clientY < topPoint;
return !!over;
}).flag().filter(Boolean).pipe(this.active);
// If a drag has ended, we should deactivate.
this.drag.flag().filter(d => !d).pipe(this.active);
}
public replaceLayout() {
const savedSections = this.viewLayout.viewModel.collapsedSections.peek();
this.viewLayout.viewModel.activeCollapsedSections(savedSections);
const boxes = this.layout.buildLayout(savedSections);
return {
dispose() {
boxes.forEach(box => box.dispose());
boxes.length = 0;
}
};
}
/**
* Builds a popup for a maximized section.
*/
public buildPopup(owner: IDisposableOwner, selected: Observable<number|null>, close: () => void) {
const section = Observable.create<number|null>(owner, null);
owner.autoDispose(selected.addListener((cur, prev) => {
if (prev) {
this.layout.getBox(prev)?.attach();
}
if (cur) {
this.layout.getBox(cur)?.detach();
}
section.set(cur);
}));
return dom.domComputed(section, (id) => {
if (!id) { return null; }
return dom.update(
buildViewSectionDom({
gristDoc: this.viewLayout.gristDoc,
sectionRowId: id,
draggable: false,
focusable: false,
})
);
});
}
public buildDom() {
return this._rootElement = cssCollapsedTray(
testId('editor'),
// When drag is active we should show a dotted border around the tray.
cssCollapsedTray.cls('-is-active', this.active.state),
// If element is over the tray, we should indicate that we are ready by changing a color.
cssCollapsedTray.cls('-is-target', this.over.state),
// Synchronize the hovering state with the event.
syncHover(this.hovering),
// Create a drop zone (below actual sections)
dom.create(CollapsedDropZone, this),
// Build the layout.
this.layout.buildDom(),
// But show only if there are any sections in the tray (even if those are empty or drop target sections)
// or we can accept a drop.
dom.show(use => use(this.layout.count) > 0 || use(this.active.state)),
);
}
public buildContentDom(id: string|number) {
return buildCollapsedSectionDom({
gristDoc: this.viewLayout.gristDoc,
sectionRowId: id,
});
}
private _registerCommands() {
const viewLayout = this.viewLayout;
// Add custom commands for options in the menu.
const commandGroup = {
// Collapse visible section.
collapseSection: () => {
const leafId = viewLayout.viewModel.activeSectionId();
if (!leafId) { return; }
// Find the box for this section in the layout.
const box = viewLayout.layoutEditor.getBox(leafId);
if (!box) { return; }
// Change the active section now. This is important as this will destroy the view before we
// remove the box from the dom. Charts are very sensitive for this.
viewLayout.viewModel.activeSectionId(
// We can't collapse last section, so the main layout will always have at least one section.
viewLayout.layoutEditor.layout.getAllLeafIds().filter(x => x !== leafId)[0]
);
// Add the box to our collapsed editor (it will transfer the viewInstance).
this.layout.addBox(leafId);
// Remove it from the main layout.
box.dispose();
// And ask the viewLayout to save the specs.
viewLayout.saveLayoutSpec();
},
expandSection: () => {
// Get the section that is collapsed and clicked (we are setting this value).
const leafId = viewLayout.viewModel.activeCollapsedSectionId();
if (!leafId) { return; }
viewLayout.viewModel.activeCollapsedSectionId(0);
viewLayout.viewModel.activeCollapsedSections(
viewLayout.viewModel.activeCollapsedSections.peek().filter(x => x !== leafId)
);
viewLayout.viewModel.activeSectionId(leafId);
viewLayout.saveLayoutSpec();
},
// Delete collapsed section.
deleteCollapsedSection: () => {
// This section is still in the view (but not in the layout). So we can just remove it.
const leafId = viewLayout.viewModel.activeCollapsedSectionId();
if (!leafId) { return; }
this.viewLayout.removeViewSection(leafId);
// We need to manually update the layout. Main layout editor doesn't care about missing sections.
// but we can't afford that. Without removing it, user can add another section that will be collapsed
// from the start, as the id will be the same as the one we just removed.
const currentSpec = viewLayout.viewModel.layoutSpecObj();
const validSections = new Set(viewLayout.viewModel.viewSections.peek().peek().map(vs => vs.id.peek()));
validSections.delete(leafId);
currentSpec.collapsed = currentSpec.collapsed
?.filter(x => typeof x.leaf === 'number' && validSections.has(x.leaf));
viewLayout.saveLayoutSpec(currentSpec);
}
};
this.autoDispose(commands.createGroup(commandGroup, this, true));
}
}
/**
* Main component that detects where the section should be dropped.
*/
class CollapsedDropZone extends Disposable {
private _rootElement: HTMLElement;
// Some operations will be blocked when we are waiting for an animation to finish.
private _animation = Observable.create(this, 0);
private _lastTarget: TargetLeaf | undefined;
private _lastIndex = -1;
constructor(protected model: LayoutTray) {
super();
// When the drag has started or has finished we will add an empty leaf that can accept
// dragged section. Event is fire only once, and it will be fired with a null when the draggable
// has finished.
let pushedLeaf: EmptyLeaf | undefined;
const layout = model.layout;
this.autoDispose(model.active.distinct().listen(ok => {
if (ok) {
pushedLeaf = EmptyLeaf.create(null, this.model);
layout.addBox(pushedLeaf);
} else if (pushedLeaf) {
layout.destroy(pushedLeaf);
}
}));
}
public buildDom() {
const obsRects = Observable.create(this, [] as Array<VRect|null>);
return (this._rootElement = cssVirtualZone(
// We are only rendered when mouse is over the tray and it has some dragged leaf with it.
dom.maybeOwned(this.model.over.state, (owner) => {
// Get the bounding rect of the rootElement, virtual rects are relative, so we will be
// adjusting coordinates.
const root = this._rootElement.getBoundingClientRect();
// We store rects in an observable, that might be used to visualize the zones.
// Create the mouseMove listener.
const listener = async (e: MouseEvent) => {
if (owner.isDisposed() || this._isAnimating()) {
return;
}
// If there are some previous rects (from previous calculation), test if we are still in one of them.
if (this._lastTarget) {
const stillThere = obsRects.get()[this._lastIndex]?.contains(e);
if (stillThere) {
return;
}
}
// Calculate the virtual zones.
obsRects.set(this._calculate(root));
// Find the one under the mouse.
const underMouse = obsRects.get().findIndex((x) => x?.contains(e));
// If it is still the same, do nothing.
if (underMouse === this._lastIndex) { return; }
// If we found something, insert a drop target.
if (underMouse !== -1) {
this._insertDropTarget(underMouse)
.catch((err) => console.error(`Failed to insert zone:`, err)); // This should not happen.
return;
}
// We haven't found anything, remove the last drop target.
this._removeDropZone().catch((err) => console.error(`Failed to remove zone:`, err));// This should not happen.
};
G.window.addEventListener('mousemove', listener);
// When mouse leaves, we need to remove the last drop target.
owner.onDispose(() => {
this._removeDropZone().catch((err) => console.error(`Failed to remove zone:`, err));// This should not happen.
});
owner.onDispose(() => G.window.removeEventListener('mousemove', listener));
// For debugging, we can show the virtual zones.
const show = false;
return !show ? null : dom.domComputed(
obsRects,
rects => rects.filter(isNonNullish).map((rect: VRect) => cssVirtualPart(
{style: `left: ${rect.left}px; width: ${rect.width}px; top: ${rect.top}px; height: ${rect.height}px;`}
)));
})
));
}
private _start() {
this._animation.set(this._animation.get() + 1);
}
private _stop() {
this._animation.set(this._animation.get() - 1);
}
private _isAnimating() {
return this._animation.get() > 0;
}
private _calculate(parentRect: DOMRect) {
const boxes = this.model.layout.all();
const rects: Array<VRect|null> = [];
// Boxes can be wrapped, we will detect the line offset.
let lineOffset = 12;
// We will always have at least one box, so we can use it to get the height.
const height = boxes[0]?.rootElement.getBoundingClientRect().height;
for (let i = 0; i < boxes.length; i++) {
const box = boxes[i];
const prev = boxes[i - 1];
const next = boxes[i + 1];
// First handle edge cases (don't add targets for first elements in next lines), it will mess up the wrapping.
if (prev && prev?.rootElement.offsetTop !== box.rootElement.offsetTop) {
rects.push(null);
continue;
}
// Now handle normal cases.
const root = box.rootElement;
lineOffset = root.offsetTop;
if (i === 0 && box instanceof CollapsedLeaf) {
// For the first one, we have very little rectangle, from the left + 50px past the left border.
const left = 0;
const right = root.offsetLeft + 50;
rects.push(new VRect(parentRect, { left, top: lineOffset, right, height }));
} else if (box instanceof CollapsedLeaf && i === boxes.length - 1) {
// Last one is very similar, little rectangle on the left part.
const left = root.offsetLeft + root.offsetWidth - 30;
const right = root.offsetLeft + root.offsetWidth + 30;
rects.push(new VRect(parentRect, { left, top: lineOffset, right, height }));
} else if (box instanceof CollapsedLeaf && prev instanceof CollapsedLeaf) {
// In between, we have a rectangle from the left border to the right border.
const leftRoot = prev.rootElement;
const rightRoot = root;
const left = leftRoot.offsetLeft + leftRoot.offsetWidth - 30;
const right = rightRoot.offsetLeft + 30;
rects.push(new VRect(parentRect, { left, top: lineOffset, right, height }));
} else if (next && box instanceof TargetLeaf && i === 0) {
// If this is a first box and it is a target, the first rectangle will be much larger, it should cover
// the TargetLeaf width.
const left = 0;
const right = next.rootElement.offsetLeft;
rects.push(new VRect(parentRect, { left, top: lineOffset, right, height }));
} else if (box instanceof TargetLeaf && prev instanceof CollapsedLeaf && next instanceof CollapsedLeaf) {
// If this box is target between two collapsed boxes, we will have a rectangle from the prev to next
// covering the whole target leaf.
const left = prev.rootElement.offsetLeft + prev.rootElement.offsetWidth - 30;
const right = next.rootElement.offsetLeft + 30;
rects.push(new VRect(parentRect, { left, top: lineOffset, right, height }));
}
}
return rects;
}
private async _insertDropTarget(index: number) {
this._start();
try {
await this._lastTarget?.remove();
this._lastTarget = TargetLeaf.create(null, this.model);
await this._lastTarget.insert(index);
this._lastIndex = index;
} finally {
this._stop();
}
}
private async _removeDropZone() {
if (!this._lastTarget) { return; }
this._start();
try {
await this._lastTarget?.remove();
this._lastTarget = undefined;
this._lastIndex = -1;
} finally {
this._stop();
}
}
}
/**
* UI component that renders and owns all the collapsed leaves.
*/
class CollapsedLayout extends Disposable {
public rootElement: HTMLElement;
/**
* Leaves owner. Adding or removing leaves will not dispose them automatically, as they are released and
* return to the caller. Only those leaves that were not removed will be disposed with the layout.
*/
public holder = ArrayHolder.create(this);
/**
* Number of leaves in the layout.
*/
public count: Computed<number>;
private _boxes = this.autoDispose(obsArray<Leaf>());
constructor(protected model: LayoutTray) {
super();
// Whenever we add or remove box, update the model. This is used to test if the section is collapsed or not.
this._boxes.addListener(l => model.viewLayout.viewModel.activeCollapsedSections(this.leafIds()));
this.count = Computed.create(this, use => use(this._boxes).length);
}
public all() {
return this._boxes.get();
}
public buildLayout(leafs: number[]) {
if (isEqual(leafs, this._boxes.get().map((box) => box.id.get()))) { return []; }
const removed = this._boxes.splice(0, this._boxes.get().length,
...leafs.map((id) => CollapsedLeaf.create(this.holder, this.model, id)));
removed.forEach((box) => this.holder.release(box));
return removed;
}
public addBox(id: number|Leaf, index?: number) {
index ??= -1;
const box = typeof id === 'number' ? CollapsedLeaf.create(this.holder, this.model, id): id;
if (typeof id !== 'number') {
this.holder.autoDispose(box);
}
return this.insert(index, box);
}
public indexOf(box: Leaf) {
return this._boxes.get().indexOf(box);
}
public insert(index: number, leaf: Leaf) {
this.holder.autoDispose(leaf);
if (index < 0) {
this._boxes.push(leaf);
} else {
this._boxes.splice(index, 0, leaf);
}
return leaf;
}
/**
* Removes the leaf from the list but doesn't dispose it.
*/
public remove(leaf: Leaf) {
const index = this._boxes.get().indexOf(leaf);
if (index >= 0) {
const removed = this._boxes.splice(index, 1)[0];
if (removed) {
this.holder.release(removed);
}
return removed || null;
}
return null;
}
/**
* Removes and dispose the leaf from the list.
*/
public destroy(leaf: Leaf) {
this.remove(leaf)?.dispose();
}
public leafIds() {
return this._boxes.get().map(l => l.id.get()).filter(x => x && typeof x === 'number');
}
public getBox(leaf: number): CollapsedLeaf|undefined {
return this._boxes.get().find(l => l.id.get() === leaf) as CollapsedLeaf|undefined;
}
public buildDom() {
return (this.rootElement = cssLayout(
testId('layout'),
useDragging(),
dom.hide(use => use(this._boxes).length === 0),
dom.forEach(this._boxes, line => line.buildDom())
));
}
}
interface Draggable {
dragStart?: (ev: DragEvent, floater: MiniFloater) => Draggable|null;
dragEnd?: (ev: DragEvent, floater: MiniFloater) => void;
drag?: (ev: DragEvent, floater: MiniFloater) => void;
drop?: (ev: DragEvent, floater: MiniFloater) => void;
}
interface Dropped {
removeFromLayout(): void;
leafId(): number;
}
/**
* Base class for all the leaves in the layout tray.
*/
abstract class Leaf extends Disposable {
public id = Observable.create(this, 0);
public rootElement: HTMLElement;
public buildDom(): HTMLElement|null {
return null;
}
}
/**
* Empty leaf that is used to represent the empty space in the collapsed layout. Can be used to drop boxes.
*/
class EmptyLeaf extends Leaf {
public name = Observable.create(this, 'empty');
// If we are hovering over the empty leaf.
private _onHover = Signal.create(this, false);
constructor(protected model: LayoutTray) {
super();
this.monitorDrop();
}
public monitorDrop() {
this.autoDispose(
this.model.drop.listen((box) => {
// If some box was dropped, and the cursor is over this leaf, we will add the box to the layout.
if (!box || !this._onHover.state.get()) {
return;
}
this.model.drop.state.set(null);
// Replace the empty leaf with the dropped box.
const myIndex = this.model.layout.indexOf(this);
const leafId = box.leafId();
this.model.layout.addBox(leafId, myIndex);
box.removeFromLayout();
})
);
}
public buildDom() {
return (this.rootElement = cssEmptyBox(
cssEmptyBox.cls('-can-accept', this._onHover.state),
syncHover(this._onHover),
testId('empty-box'),
));
}
}
/**
* This is an empty leaf that supports animation when added to the list.
*/
class TargetLeaf extends EmptyLeaf {
public buildDom() {
this.name.set('target');
const element = super.buildDom();
dom.update(element,
testId('target-box'),
dom.cls(cssProbe.className),
{ style: 'width: 2px;' }
);
return element;
}
public insert(index: number) {
// First insert the drop target leaf.
this.model.layout.insert(index, this);
// Force the reflow, so that we can start the animation.
this.rootElement.getBoundingClientRect();
// Start and wait for the animation to finish.
return new Promise((resolve) => {
const watcher = new TransitionWatcher(this.rootElement);
watcher.onDispose(() => {
resolve(undefined);
});
this.rootElement.style.width = '';
});
}
public remove() {
return new Promise((resolve) => {
const watcher = new TransitionWatcher(this.rootElement);
watcher.onDispose(() => {
this.model.layout.destroy(this);
resolve(undefined);
});
this.rootElement.style.width = '0px';
});
}
}
/**
* This is the collapsed widget that is shown in the collapsed layout. It can be dragged and dropped.
*/
class CollapsedLeaf extends Leaf implements Draggable, Dropped {
// The content of the leaf that is rendered. Stored in an observable so that we can update it when the
// content changes or put it in the floater.
private _content: Observable<HTMLElement|null> = Observable.create(this, null);
// Computed to get the view instance from the viewSection.
private _viewInstance: Computed<BaseView|null>;
// An observable for the dom that holds the viewInstance and displays it in a hidden element.
// This is owned by this leaf and is disposed separately from the dom that is returned by buildDom. Like a
// singleton, this element will be moved from one "instance" (a result of buildDom) to another.
// When a leaf is removed from the dom (e.g. when we remove the collapsed section or move it to the main area)
// the dom of this element is disposed, but the hidden element stays with this instance and can be disposed
// later on, giving anyone a chance to grab the viewInstance and display it somewhere else.
private _hiddenViewInstance: Observable<HTMLElement|null> = Observable.create(this, null);
// Helper to keeping track of the index of the leaf in the layout.
private _indexWhenDragged = 0;
// A helper variable that indicates that this section is in a popup, and we should
// make any attempt to grab it and attach to our dom. Note: this is not a computed variable.
private _detached = false;
constructor(protected model: LayoutTray, id: number) {
super();
this.id.set(id);
this._viewInstance = Computed.create(this, use => {
const sections = use(use(this.model.viewLayout.viewModel.viewSections).getObservable());
const view = sections.find(s => use(s.id) === use(this.id));
if (!view) { return null; }
const instance = use(view.viewInstance);
return instance;
});
this._buildHidden();
this.onDispose(() => {
const instance = this._hiddenViewInstance.get();
instance && dom.domDispose(instance);
});
}
public detach() {
this._detached = true;
}
public attach() {
this._detached = false;
const previous = this._hiddenViewInstance.get();
this._buildHidden();
previous && dom.domDispose(previous);
}
public buildDom() {
this._content.set(this.model.buildContentDom(this.id.get()));
return this.rootElement = cssBox(
testId('leaf-box'),
dom.domComputed(this._content, c => c),
// Add draggable interface.
asDraggable(this),
dom.on('click', (e) => {
this.model.viewLayout.viewModel.activeCollapsedSectionId(this.id.get());
// Sanity (and type) check.
if (!(e.target instanceof HTMLElement)) {
return;
}
// If the click not landed in a draggable-handle ignore it. Might be a click to open the menu.
if (!e.target.closest('.draggable-handle')) {
return;
}
// Apparently the click was to open the section in the popup. Use the anchor link to do that.
// Show my section on a popup using anchor link. We can't use maximize section for it, as we
// would need to rebuild the layout (as this is not a part of it).
urlState().pushUrl({
hash: {
sectionId: this.id.get(),
popup: true
}
}).catch(() => {});
e.preventDefault();
e.stopPropagation();
}),
detachedNode(this._hiddenViewInstance),
);
}
// Implement the drag interface. All those methods are called by the draggable helper.
public dragStart(ev: DragEvent, floater: MiniFloater) {
// Get the element.
const myElement = this._content.get();
this._content.set(null);
floater.content.set(myElement);
// Create a clone.
const clone = CollapsedLeaf.create(floater, this.model, this.id.get());
clone._indexWhenDragged = this.model.layout.indexOf(this);
this.model.drag.emit(clone);
// Remove self from the layout (it will dispose this instance, but the viewInstance was moved to the floater)
this.model.layout.destroy(this);
return clone;
}
public dragEnd(ev: DragEvent) {
this.model.drag.emit(null);
}
public drag(ev: DragEvent) {
this.model.dragging.emit(ev);
}
public drop(ev: DragEvent, floater: MiniFloater) {
// Take back the element.
const element = floater.content.get();
floater.content.set(null);
this._content.set(element);
this.model.drop.emit(this);
// If I wasn't moved somewhere else, read myself back.
if (this.id.get() !== 0) {
this.model.layout.addBox(this.id.get(), this._indexWhenDragged);
}
}
public removeFromLayout() {
// Set the id to 0 so that the layout doesn't try to read me back.
this.id.set(0);
this.model.layout.destroy(this);
}
public leafId() {
return this.id.get();
}
private _buildHidden() {
this._hiddenViewInstance.set(cssHidden(dom.maybe(this._viewInstance, view => {
return this._detached ? null : view.viewPane;
})));
}
}
/**
* This is analogous component to the main Floater in the LayoutEditor. It holds the little preview of a widget,
* while it is dragged.
*/
class MiniFloater extends Disposable {
public content: Observable<HTMLElement|null> = Observable.create(this, null);
public rootElement: HTMLElement;
constructor() {
super();
this.rootElement = this.buildDom();
G.document.body.appendChild(this.rootElement);
this.onDispose(() => {
this.rootElement.remove();
dom.domDispose(this.rootElement);
});
}
public buildDom() {
return cssMiniFloater(
dom.show(use => Boolean(use(this.content))),
// dom.cls('layout_editor_floater'),
dom.domComputed(this.content, c => c)
);
}
public onMove(ev: MouseEvent) {
if (this.content.get()) {
this.rootElement.style.left = `${ev.clientX}px`;
this.rootElement.style.top = `${ev.clientY}px`;
}
}
}
/**
* ExternalLeaf pretends that it is a collapsed leaf and acts as a proxy between collapsed tray and the
* ViewLayout.
*/
class ExternalLeaf extends Disposable implements Dropped {
// If external element is in drag mode
public drag: Signal<Dropped>;
// Event when external leaf is being dragged.
public dragMove: Signal<MouseEvent>;
// Event when external leaf is dropped.
private _drop: Signal<ContentBox>;
constructor(protected model: LayoutTray) {
super();
// Wire up external events to mimic that we are a part.
// First we will replace all events, so that they won't emit anything if we are the only leaf
// in the layout.
const multipleLeaves = () => this.model.viewLayout.layout.getAllLeafIds().length > 1;
this.drag = Signal.fromEvents(this, this.model.viewLayout.layoutEditor, 'dragStart', 'dragEnd')
.filter(multipleLeaves);
this._drop = Signal.fromEvents(this, this.model.viewLayout.layoutEditor, 'dragDrop')
.filter(multipleLeaves);
this.dragMove = Signal.fromEvents(this, this.model.viewLayout.layoutEditor, 'dragMove')
.filter(multipleLeaves);
// Now bubble up those events to the model.
// For dragging we just need to know that it is on or off.
this.drag.map(box => {
// We are tricking the model, we report that we are dragged, not the external leaf.
return box ? this as Dropped : null;
}).distinct().pipe(this.model.drag);
// When the external box is dropped, we will pretend that we were dropped.
this._drop.map(x => this as Dropped|null).pipe(this.model.drop);
// Listen to the inDrag state in the model, if the dragged element is not us, update
// target hits. Otherwise target hits will be updated by the viewLayout.
this.autoDispose(model.dragging.listen(ev => {
// If the dragged box is not us, we need to update the targets.
if (ev && model.drag.state.get() !== this) {
this.model.viewLayout.layoutEditor.updateTargets(ev);
}
}));
// When drag is started by tray, we need to fire up user edit event. This is only needed
// because the viewLayout has a different UI when user is editing.
const miniDrag = Signal.compute(this, on => on(model.drag) && !on(this.drag)).map(Boolean).distinct();
this.autoDispose(miniDrag.listen(box => {
if (box) {
this.model.viewLayout.layoutEditor.triggerUserEditStart();
} else {
const dropTargeter = this.model.viewLayout.layoutEditor.dropTargeter;
dropTargeter.removeTargetHints();
// Save the layout immediately after the drop. Otherwise we would wait a bit,
// and the section won't be created on time.
this.model.viewLayout.layoutEditor.triggerUserEditStop();
// Manually save the layout.
this.model.viewLayout.saveLayoutSpec();
}
}));
// We are responsible for saving the layout, when section is collapsed or expanded.
// Also we need to monitor when mini leaf is dropped, it will trigger a drop event,
// but non-one will listen to it.
this.autoDispose(
model.drop.listen(dropped => {
if (!dropped) {
return;
}
// If I was dropped (collapsed) over the tray, we don't need to do anything here.
// Our leaf was removed already and the layout will be saved by the miniDrag event.
// If I was dropped anywhere else, we don't need to do anything either, viewLayout will
// take care of it.
if (dropped === this) {
return;
}
// We only care when collapsed widget was dropped over the main area.
const externalEditor = this.model.viewLayout.layoutEditor;
const dropTargeter = this.model.viewLayout.layoutEditor.dropTargeter;
// Check that it was dropped over the main area.
if (dropTargeter?.activeTarget && !dropTargeter?.activeTarget?.box.isDisposed()) {
// Remove the widget from the tray, and at new leaf to the layout.
const part = dropTargeter.activeTarget;
dropTargeter.removeTargetHints();
const leaf = dropped.leafId();
const box = externalEditor.layout.buildLayoutBox({leaf});
dropped.removeFromLayout();
if (part.isChild) {
part.box.addChild(box, part.isAfter);
} else {
part.box.addSibling(box, part.isAfter);
}
this.model.viewLayout.viewModel.activeSectionId(leaf);
this.model.drop.state.set(null);
}
})
);
this._replaceFloater();
}
/**
* Dropped interface implementation, it is called only when a section in the main area is collapsed (dragged
* onto the valid target in the tray).
*/
public removeFromLayout() {
const droppedBox = this._drop.state.get();
if (!droppedBox) { return; }
const leafId = this.leafId();
const otherSection = this.model.viewLayout.layoutEditor
.layout.getAllLeafIds().find(x => typeof x === 'number' && x !== leafId);
this.model.viewLayout.viewModel.activeSectionId(otherSection);
// We can safely remove the box, because we should be called after viewInstance is grabbed by
// the tray.
this.model.viewLayout.layoutEditor.doRemoveBox(droppedBox);
}
public leafId() {
return this._drop.state.get()?.leafId.peek() || 0;
}
/**
* Monitors the external floater element, and if it is on top of the collapsed tray, replaces its content.
*/
private _replaceFloater() {
const model = this.model;
// We will replace floater just after it starts till it is about to be dropped.
const period = Signal.fromEvents(model, model.viewLayout.layoutEditor, 'dragStart', 'dragStop');
const overEditor = Signal.compute(model, on => Boolean(on(period) && on(model.over))).distinct();
let lastContent: HTMLElement|null = null;
let lastTransform: string|null = null;
let lastX: number|null = null;
let lastY: number|null = null;
// When the external box is on top of the tray, we need to replace the content to be much smaller.
model.autoDispose(
overEditor.listen(over => {
if (over) {
const floater = model.viewLayout.layoutEditor.floater;
const leafId = floater.leafId.peek();
if (typeof leafId !== 'number') {
return;
}
const content = floater.leafContent.peek() as HTMLElement;
if (content) {
lastContent = content;
// Hide this element.
content.style.display = 'none';
// Create another element to show in the floater.
const newContent = cssFloaterWrapper(content, buildCollapsedSectionDom({
gristDoc: model.viewLayout.gristDoc,
sectionRowId: leafId,
}));
floater.leafContent(newContent);
lastTransform = floater.dom.style.transform;
lastX = floater.mouseOffsetX;
lastY = floater.mouseOffsetY;
floater.dom.style.transform = 'none';
floater.mouseOffsetX = 0;
floater.mouseOffsetY = 0;
}
} else if (lastContent) {
lastContent.style.display = '';
const floater = model.viewLayout.layoutEditor.floater;
const currentContent = floater.leafContent.peek() as HTMLElement;
floater.leafContent(lastContent);
if (currentContent) {
dom.domDispose(currentContent);
}
lastContent = null;
floater.dom.style.transform = lastTransform!;
floater.mouseOffsetX = lastX!;
floater.mouseOffsetY = lastY!;
}
})
);
}
}
/**
* A class that holds an array of IDisposable objects, and disposes them all when it is disposed.
* The difference from a MultipleHolder is that it can release individual disposables from the array.
*/
class ArrayHolder extends Disposable {
private _array: IDisposable[] = [];
constructor() {
super();
this.onDispose(() => {
const seen = new Set();
for (const obj of this._array) {
if (!seen.has(obj)) {
seen.add(obj);
obj.dispose();
}
}
this._array = [];
});
}
public autoDispose<T extends IDisposable>(obj: T): T {
this._array.push(obj);
return obj;
}
public release(obj: IDisposable) {
const index = this._array.indexOf(obj);
if (index >= 0) {
return this._array.splice(index, 1);
}
return null;
}
}
function syncHover(obs: Signal) {
return [dom.on('mouseenter', () => obs.emit(true)), dom.on('mouseleave', () => obs.emit(false))];
}
/**
* Helper function that renders an element from an observable, but prevents it from being disposed.
* Used to keep viewInstance from being disposed when it is added as a child in various containers.
*/
function detachedNode(node: Observable<HTMLElement|null>) {
return [
dom.maybe(node, n => n),
dom.onDispose(() => node.get() && detachNode(node.get()))
];
}
/**
* Finds element that is marked as draggable from the mouse event.
*/
function findDraggable(ev: EventTarget|null) {
if (ev instanceof HTMLElement) {
const target = ev.closest(".draggable-handle")?.closest(".draggable");
return !target ? null : dom.getData(target, 'draggable') as Draggable;
}
return null;
}
/**
* Marks a dom element as draggable. It sets a class and a data attribute that is looked up by the useDragging helper.
*/
function asDraggable(item: Draggable) {
return [
dom.cls('draggable'),
dom.data('draggable', item)
];
}
/**
* Attaches a mouse events for dragging to a parent container. This way we have a single mouse event listener
* for all draggable elements. All events are then delegated to the draggable elements.
*
* When a drag is started a MiniFloater is created, and the draggable element can be moved to the floater.
*/
function useDragging() {
return (el: HTMLElement) => {
// Implement them by hand, using mouseenter, mouseleave, and mousemove events.
// This is a inspired by LayoutEditor.ts.
let justStarted = false;
let isDragging = false;
let dragged: Draggable|null = null;
let floater: MiniFloater|null = null;
let downX: number|null = null;
let downY: number|null = null;
const listener = (ev: MouseEvent) => {
switch (ev.type) {
case 'mousedown':
// Only handle left button.
if (ev.button !== 0) {
return;
}
// If we haven't found a draggable element, return.
dragged = findDraggable(ev.target);
if (!dragged) {
return;
}
// If we had floater, dispose it.
floater?.dispose();
floater = new MiniFloater();
// Start drag and attach mousemove and mouseup listeners.
justStarted = true;
G.$(G.window).on('mousemove', mouseMoveListener);
G.$(G.window).on('mouseup', mouseUpListener);
downX = ev.clientX;
downY = ev.clientY;
return false;
case 'mouseup':
if (!dragged) {
return;
}
justStarted = false;
G.$(G.window).off('mousemove', mouseMoveListener);
G.$(G.window).off('mouseup', mouseUpListener);
if (isDragging) {
isDragging = false;
if (dragged?.drop) {
dragged.drop(ev as DragEvent, floater!);
}
if (dragged?.dragEnd) {
dragged.dragEnd(ev as DragEvent, floater!);
}
}
dragged = null;
floater?.dispose();
floater = null;
return false;
case 'mousemove':
if (justStarted) {
const slightMove = downX && downY &&
(Math.abs(ev.clientX - downX) > 3 || Math.abs(ev.clientY - downY) > 3);
if (slightMove) {
justStarted = false;
if (dragged?.dragStart) {
// Drag element has an opportunity to return a new draggable object.
dragged = dragged.dragStart(ev as DragEvent, floater!);
if (!dragged) {
return;
}
}
// Now we are dragging.
isDragging = true;
}
}
if (!isDragging) {
return;
}
if (dragged?.drag) {
dragged.drag(ev as DragEvent, floater!);
}
floater!.onMove(ev);
return false;
}
};
const mouseMoveListener = (ev: MouseEvent) => listener(ev);
const mouseUpListener = (ev: MouseEvent) => listener(ev);
dom.autoDisposeElem(el, dom.onElem(G.window, 'mousedown', (e) => listener(e)));
dom.onDisposeElem(el, () => (floater?.dispose(), floater = null));
};
}
/**
* A virtual rectangle that is relative to a DOMRect.
*/
class VRect {
public left: number;
public width: number;
public top: number;
public right: number;
public height: number;
constructor(offset: DOMRect, params: Partial<VRect>) {
Object.assign(this, params);
this.left += offset.left;
this.right += offset.left;
this.top += offset.top;
this.width = this.right - this.left;
}
public contains(ev: MouseEvent) {
return ev.clientX >= this.left && ev.clientX <= this.right &&
ev.clientY >= this.top && ev.clientY <= this.top + this.height;
}
}
const cssVirtualZone = styled('div', `
position: absolute;
inset: 0;
`);
const cssFloaterWrapper = styled('div', `
height: 40px;
width: 140px;
max-width: 140px;
background: ${theme.tableBodyBg};
border: 1px solid ${theme.widgetBorder};
border-radius: 4px;
-webkit-transform: rotate(5deg) scale(0.8) translate(-10px, 0px);
transform: rotate(5deg) scale(0.8) translate(-10px, 0px);
& .mini_section_container {
overflow: hidden;
white-space: nowrap;
}
`);
const cssCollapsedTray = styled('div.collapsed_layout', `
display: flex;
flex-direction: column;
overflow: hidden;
transition: height 0.2s;
position: relative;
margin: calc(-1 * var(--view-content-page-margin, 12px));
margin-bottom: 0;
user-select: none;
background-color: ${theme.pageBg};
border-bottom: 1px solid ${theme.pagePanelsBorder};
outline-offset: -1px;
&-is-active {
outline: 2px dashed ${theme.widgetBorder};
}
&-is-target {
outline: 2px dashed #7B8CEA;
background: rgba(123, 140, 234, 0.1);
}
`
);
const cssRow = styled('div', `display: flex`);
const cssLayout = styled(cssRow, `
padding: 8px 24px;
column-gap: 16px;
row-gap: 8px;
flex-wrap: wrap;
position: relative;
`);
const cssBox = styled('div', `
border: 1px solid ${theme.widgetBorder};
border-radius: 3px;
background: ${theme.widgetBg};
min-width: 120px;
min-height: 34px;
cursor: pointer;
`);
const cssEmptyBox = styled('div', `
text-align: center;
text-transform: uppercase;
color: ${theme.widgetBorder};
font-weight: bold;
letter-spacing: 1px;
border: 2px dashed ${theme.widgetBorder};
border-radius: 3px;
padding: 8px;
width: 120px;
min-height: 34px;
&-can-accept {
border: 2px dashed #7B8CEA;
background: rgba(123, 140, 234, 0.1);
}
`);
const cssProbe = styled('div', `
min-width: 0px;
padding: 0px;
transition: width 0.2s ease-out;
`);
const cssMiniFloater = styled(cssBox, `
pointer-events: none;
position: absolute;
overflow: hidden;
pointer-events: none;
z-index: 10;
-webkit-transform: rotate(5deg) scale(0.8);
transform: rotate(5deg) scale(0.8);
transform-origin: top left;
`);
const cssVirtualPart = styled('div', `
outline: 1px solid blue;
position: absolute;
z-index: 10;
background: rgba(0, 0, 0, 0.1);
`);
const cssHidden = styled('div', `display: none;`);