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import { mutateBlock, mutateSegment } from '../common/mutate';
import type {
MutableType,
ReadonlyContentModelBlock,
ReadonlyContentModelBlockGroup,
ReadonlyContentModelParagraph,
ReadonlyContentModelSegment,
ReadonlyContentModelTable,
ReadonlySelectable,
ShallowMutableSelectable,
TableCellCoordinate,
} from 'roosterjs-content-model-types';
/**
* Set selection into Content Model. If the Content Model already has selection, existing selection will be overwritten by the new one.
* @param group The root level group of Content Model
* @param start The start selected element. If not passed, existing selection of content model will be cleared
* @param end The end selected element. If not passed, only the start element will be selected. If passed, all elements between start and end elements will be selected
*/
export function setSelection(
group: ReadonlyContentModelBlockGroup,
start?: ReadonlySelectable,
end?: ReadonlySelectable
) {
setSelectionToBlockGroup(group, false /*isInSelection*/, start || null, end || null);
}
function setSelectionToBlockGroup(
group: ReadonlyContentModelBlockGroup,
isInSelection: boolean,
start: ReadonlySelectable | null,
end: ReadonlySelectable | null
): boolean {
return handleSelection(isInSelection, group, start, end, isInSelection => {
Iif (isGeneralSegment(group) && needToSetSelection(group, isInSelection)) {
setIsSelected(mutateBlock(group), isInSelection);
}
const blocksToDelete: number[] = [];
group.blocks.forEach((block, i) => {
isInSelection = setSelectionToBlock(block, isInSelection, start, end);
if (block.blockType == 'Paragraph' && block.segments.length == 0 && block.isImplicit) {
blocksToDelete.push(i);
}
});
let index: number | undefined;
if (blocksToDelete.length > 0) {
const mutableGroup = mutateBlock(group);
while ((index = blocksToDelete.pop()) !== undefined) {
Eif (index >= 0) {
mutableGroup.blocks.splice(index, 1);
}
}
}
return isInSelection;
});
}
function setSelectionToBlock(
block: ReadonlyContentModelBlock,
isInSelection: boolean,
start: ReadonlySelectable | null,
end: ReadonlySelectable | null
) {
switch (block.blockType) {
case 'BlockGroup':
return setSelectionToBlockGroup(block, isInSelection, start, end);
case 'Table':
return setSelectionToTable(block, isInSelection, start, end);
case 'Divider':
case 'Entity':
return handleSelection(isInSelection, block, start, end, isInSelection => {
if (needToSetSelection(block, isInSelection)) {
const mutableBlock = mutateBlock(block);
if (isInSelection) {
mutableBlock.isSelected = true;
} else {
delete mutableBlock.isSelected;
}
}
return isInSelection;
});
case 'Paragraph':
const segmentsToDelete: number[] = [];
block.segments.forEach((segment, i) => {
isInSelection = handleSelection(
isInSelection,
segment,
start,
end,
isInSelection => {
return setSelectionToSegment(
block,
segment,
isInSelection,
segmentsToDelete,
start,
end,
i
);
}
);
});
if (segmentsToDelete.length > 0) {
const mutablePara = mutateBlock(block);
let index: number | undefined;
while ((index = segmentsToDelete.pop()) !== undefined) {
Eif (index >= 0) {
mutablePara.segments.splice(index, 1);
}
}
}
return isInSelection;
default:
return isInSelection;
}
}
function setSelectionToTable(
table: ReadonlyContentModelTable,
isInSelection: boolean,
start: ReadonlySelectable | null,
end: ReadonlySelectable | null
): boolean {
const first = findCell(table, start);
const last = end ? findCell(table, end) : first;
if (!isInSelection) {
for (let row = 0; row < table.rows.length; row++) {
const currentRow = table.rows[row];
for (let col = 0; col < currentRow.cells.length; col++) {
const currentCell = table.rows[row].cells[col];
const isSelected =
row >= first.row && row <= last.row && col >= first.col && col <= last.col;
if (needToSetSelection(currentCell, isSelected)) {
setIsSelected(mutateBlock(currentCell), isSelected);
}
if (!isSelected) {
setSelectionToBlockGroup(currentCell, false /*isInSelection*/, start, end);
}
}
}
} else {
table.rows.forEach(row =>
row.cells.forEach(cell => {
const wasInSelection = isInSelection;
isInSelection = setSelectionToBlockGroup(cell, isInSelection, start, end);
if (wasInSelection && isInSelection) {
mutateBlock(cell).isSelected = true;
}
})
);
}
return isInSelection;
}
function findCell(
table: ReadonlyContentModelTable,
cell: ReadonlySelectable | null
): TableCellCoordinate {
let col = -1;
const row = cell
? table.rows.findIndex(
row => (col = (row.cells as ReadonlyArray<ReadonlySelectable>).indexOf(cell)) >= 0
)
: -1;
return { row, col };
}
function setSelectionToSegment(
paragraph: ReadonlyContentModelParagraph,
segment: ReadonlyContentModelSegment,
isInSelection: boolean,
segmentsToDelete: number[],
start: ReadonlySelectable | null,
end: ReadonlySelectable | null,
i: number
) {
switch (segment.segmentType) {
case 'SelectionMarker':
if (!isInSelection || (segment != start && segment != end)) {
// Delete the selection marker when
// 1. It is not in selection any more. Or
// 2. It is in middle of selection, so no need to have it
segmentsToDelete.push(i);
}
return isInSelection;
case 'General':
internalSetSelectionToSegment(paragraph, segment, isInSelection);
return segment != start && segment != end
? setSelectionToBlockGroup(segment, isInSelection, start, end)
: isInSelection;
case 'Image':
const isSelectedAsImageSelection = start == segment && (!end || end == segment);
internalSetSelectionToSegment(
paragraph,
segment,
isInSelection,
!segment.isSelectedAsImageSelection != !isSelectedAsImageSelection
? image => (image.isSelectedAsImageSelection = isSelectedAsImageSelection)
: undefined
);
return isInSelection;
default:
internalSetSelectionToSegment(paragraph, segment, isInSelection);
return isInSelection;
}
}
function internalSetSelectionToSegment<T extends ReadonlyContentModelSegment>(
paragraph: ReadonlyContentModelParagraph,
segment: T,
isInSelection: boolean,
additionAction?: (segment: MutableType<T>) => void
) {
if (additionAction || needToSetSelection(segment, isInSelection)) {
mutateSegment(paragraph, segment, mutableSegment => {
setIsSelected(mutableSegment, isInSelection);
additionAction?.(mutableSegment);
});
}
}
function needToSetSelection(selectable: ReadonlySelectable, isSelected: boolean) {
return !selectable.isSelected != !isSelected;
}
function setIsSelected(selectable: ShallowMutableSelectable, value: boolean) {
if (value) {
selectable.isSelected = true;
} else {
delete selectable.isSelected;
}
return value;
}
function handleSelection(
isInSelection: boolean,
model: ReadonlyContentModelBlockGroup | ReadonlyContentModelBlock | ReadonlyContentModelSegment,
start: ReadonlySelectable | null,
end: ReadonlySelectable | null,
callback: (isInSelection: boolean) => boolean
) {
isInSelection = isInSelection || model == start;
isInSelection = callback(isInSelection);
return isInSelection && !!end && model != end;
}
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