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Block List: Start multi-selection tracking on mousemove #4585

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merged 2 commits into from
Jan 19, 2018
Merged

Block List: Start multi-selection tracking on mousemove #4585

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b217baa
Block List: Start multi-selection tracking on mousemove
aduth Jan 18, 2018
6d6231e
State: Abort state update if multi-select action has no effect
aduth Jan 19, 2018
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37 changes: 34 additions & 3 deletions editor/components/block-list/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@ import {
getMultiSelectedBlockUids,
getSelectedBlock,
isSelectionEnabled,
isMultiSelecting,
} from '../../store/selectors';
import { startMultiSelect, stopMultiSelect, multiSelect, selectBlock } from '../../store/actions';
import { documentHasSelection } from '../../utils/dom';
Expand Down Expand Up @@ -100,7 +101,21 @@ class BlockList extends Component {
}
}

/**
* Handles a pointer move event to update the extent of the current cursor
* multi-selection.
*
* @param {MouseEvent} event A mousemove event object.
*
* @returns {void}
*/
onPointerMove( { clientY } ) {
// We don't start multi-selection until the mouse starts moving, so as
// to avoid dispatching multi-selection actions on an in-place click.
if ( ! this.props.isMultiSelecting ) {
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@ellatrix ellatrix Jan 18, 2018 •
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Maybe a stupid question, but could this be built in the reducer if it should always be used like this? Same for stopping the selection.

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Maybe a stupid question, but could this be built in the reducer if it should always be used like this? Same for stopping the selection.

Can you clarify what you mean? I have two interpretations:

  • Should the state.blockSelection.isMultiSelecting flag be automatically assigned to true when MULTI_SELECT is dispatched, vs. an explicit START_MULTI_SELECT action?
    • Perhaps, if we're okay with the fact that isMultiSelecting is not reflected immediately upon starting to drag the mouse, but only after the drag extends across at least one additional block
    • I'm also not sure how it would be possible to infer the end of a multi-selection via this behavior
  • Handle the check to only change the value of isMultiSelecting if it's not already true, from the reducer itself, rather than in the component

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Yes, I mean the second point. Sounds good to me then. :)

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I added 6d6231e to cover our bases 😄

this.props.onStartMultiSelect();
}

const boundaries = this.nodes[ this.selectionAtStart ].getBoundingClientRect();
const y = clientY - boundaries.top;
const key = findLast( this.coordMapKeys, ( coordY ) => coordY < y );
Expand Down Expand Up @@ -138,6 +153,14 @@ class BlockList extends Component {
}
}

/**
* Binds event handlers to the document for tracking a pending multi-select
* in response to a mousedown event occurring in a rendered block.
*
* @param {string} uid UID of the block where mousedown occurred.
*
* @returns {void}
*/
onSelectionStart( uid ) {
if ( ! this.props.isSelectionEnabled ) {
return;
Expand All @@ -161,8 +184,6 @@ class BlockList extends Component {
// Capture scroll on all elements.
window.addEventListener( 'scroll', this.onScroll, true );
window.addEventListener( 'mouseup', this.onSelectionEnd );

this.props.onStartMultiSelect();
}

onSelectionChange( uid ) {
Expand All @@ -183,6 +204,11 @@ class BlockList extends Component {
}
}

/**
* Handles a mouseup event to end the current cursor multi-selection.
*
* @returns {void}
*/
onSelectionEnd() {
// Cancel throttled calls.
this.onPointerMove.cancel();
Expand All @@ -195,7 +221,11 @@ class BlockList extends Component {
window.removeEventListener( 'scroll', this.onScroll, true );
window.removeEventListener( 'mouseup', this.onSelectionEnd );

this.props.onStopMultiSelect();
// We may or may not be in a multi-selection when mouseup occurs (e.g.
// an in-place mouse click), so only trigger stop if multi-selecting.
if ( this.props.isMultiSelecting ) {
this.props.onStopMultiSelect();
}
}

onShiftSelection( uid ) {
Expand Down Expand Up @@ -244,6 +274,7 @@ export default connect(
multiSelectedBlockUids: getMultiSelectedBlockUids( state ),
selectedBlock: getSelectedBlock( state ),
isSelectionEnabled: isSelectionEnabled( state ),
isMultiSelecting: isMultiSelecting( state ),
} ),
( dispatch ) => ( {
onStartMultiSelect() {
Expand Down