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TRACKER_CHANNEL_FIELDS,
TRACKER_NUM_FIELDS,
TRACKER_PATTERN_LENGTH,
TRACKER_ROW_SIZE,
} from "consts";
import { PatternCellAddress } from "shared/lib/uge/editor/types";
import { resolveUniqueTrackerCells } from "store/features/trackerDocument/trackerDocumentHelpers";
export interface SelectionRect {
x: number;
y: number;
width: number;
height: number;
}
export interface Position {
x: number;
y: number;
}
export const TRACKER_HEADER_HEIGHT = 40;
export const TRACKER_INDEX_WIDTH = 56;
export const TRACKER_CELL_HEIGHT = 28;
const PATTERN_FIELD_COUNT = TRACKER_PATTERN_LENGTH * TRACKER_ROW_SIZE;
/** Wraps a field index into the valid range `[0, TRACKER_NUM_FIELDS)`. */
export const normalizeFieldIndex = (field: number) =>
((field % TRACKER_NUM_FIELDS) + TRACKER_NUM_FIELDS) % TRACKER_NUM_FIELDS;
/** Converts a flat field index to its (column, row) grid position. */
export const fieldToPosition = (field: number): Position => ({
x: field % TRACKER_ROW_SIZE,
y: Math.floor(field / TRACKER_ROW_SIZE),
});
const positionToField = (position: Position) =>
position.y * TRACKER_ROW_SIZE + position.x;
/**
* Builds a normalised SelectionRect from a fixed origin position and a target
* field index. The rect always has non-negative width and height.
*/
export const buildSelectionRect = (
origin: Position,
targetField: number,
): SelectionRect => {
const target = fieldToPosition(targetField);
return {
x: Math.min(origin.x, target.x),
y: Math.min(origin.y, target.y),
width: Math.abs(origin.x - target.x),
height: Math.abs(origin.y - target.y),
};
};
/**
* Returns all field indices covered by `selectionRect`, or the single field at
* `selectionOrigin` when no rect is active.
*/
export const getSelectedTrackerFields = (
selectionRect: SelectionRect | undefined,
selectionOrigin: Position | undefined,
) => {
const selectedTrackerFields: number[] = [];
if (selectionRect) {
for (
let x = selectionRect.x;
x <= selectionRect.x + selectionRect.width;
x++
) {
for (
let y = selectionRect.y;
y <= selectionRect.y + selectionRect.height;
y++
) {
selectedTrackerFields.push(y * TRACKER_ROW_SIZE + x);
}
}
} else if (selectionOrigin) {
selectedTrackerFields.push(positionToField(selectionOrigin));
}
return selectedTrackerFields;
};
/** Returns which column-focus type (note / instrument / effect code / effect param) a field index maps to. */
export const getFieldColumnFocus = (
field: number,
):
| "noteColumnFocus"
| "instrumentColumnFocus"
| "effectCodeColumnFocus"
| "effectParamColumnFocus" => {
switch (field % 4) {
case 0:
return "noteColumnFocus";
case 1:
return "instrumentColumnFocus";
case 2:
return "effectCodeColumnFocus";
case 3:
return "effectParamColumnFocus";
default:
return "noteColumnFocus";
}
};
/**
* Converts a list of tracker field indices for a given sequence/pattern into
* unique PatternCellAddress objects, deduplicating multi-field cells.
*/
export const trackerFieldsToPatternCells = (
sequenceId: number,
patternId: number,
selectedTrackerFields: number[],
): PatternCellAddress[] => {
const resolvedCells = resolveUniqueTrackerCells(
patternId,
selectedTrackerFields,
);
return resolvedCells.map(({ rowIndex, channelIndex }) => ({
sequenceId,
rowId: rowIndex,
channelId: channelIndex,
}));
};
const encodePatternChannelRowState = (
activeFieldInCell: number,
selectedMask: number,
): number => ((selectedMask & 0xf) << 3) | (activeFieldInCell + 1);
export interface DecodedPatternChannelRowState {
rowActive: boolean;
noteActive: boolean;
noteSelected: boolean;
instrumentActive: boolean;
instrumentSelected: boolean;
effectCodeActive: boolean;
effectCodeSelected: boolean;
effectParamActive: boolean;
effectParamSelected: boolean;
}
export const decodePatternChannelRowState = (
rowState: number,
): DecodedPatternChannelRowState => {
const activeFieldInCell = (rowState & 0b111) - 1;
const selectedMask = rowState >> 3;
return {
rowActive: activeFieldInCell !== -1,
noteActive: activeFieldInCell === 0,
noteSelected: (selectedMask & 0b0001) !== 0,
instrumentActive: activeFieldInCell === 1,
instrumentSelected: (selectedMask & 0b0010) !== 0,
effectCodeActive: activeFieldInCell === 2,
effectCodeSelected: (selectedMask & 0b0100) !== 0,
effectParamActive: activeFieldInCell === 3,
effectParamSelected: (selectedMask & 0b1000) !== 0,
};
};
interface PatternChannelRowStateArgs {
trackerActiveField: number | undefined;
selectionSequenceId: number | undefined;
selectedTrackerFields: number[];
renderSequenceId: number;
channelId: 0 | 1 | 2 | 3;
rowIndex: number;
}
export const getPatternChannelRowState = ({
trackerActiveField,
selectionSequenceId,
selectedTrackerFields,
renderSequenceId,
channelId,
rowIndex,
}: PatternChannelRowStateArgs): number => {
const channelFieldBase = channelId * TRACKER_CHANNEL_FIELDS;
let activeFieldInCell = -1;
if (
trackerActiveField !== undefined &&
Math.floor(trackerActiveField / PATTERN_FIELD_COUNT) === renderSequenceId
) {
const activeLocalField = trackerActiveField % PATTERN_FIELD_COUNT;
const activeRowIndex = Math.floor(activeLocalField / TRACKER_ROW_SIZE);
const fieldInRow = activeLocalField % TRACKER_ROW_SIZE;
if (
activeRowIndex === rowIndex &&
fieldInRow >= channelFieldBase &&
fieldInRow < channelFieldBase + TRACKER_CHANNEL_FIELDS
) {
activeFieldInCell = fieldInRow - channelFieldBase;
}
}
let selectedMask = 0;
if (selectionSequenceId === renderSequenceId) {
for (const field of selectedTrackerFields) {
const selectedRowIndex = Math.floor(field / TRACKER_ROW_SIZE);
if (selectedRowIndex !== rowIndex) {
continue;
}
const fieldInRow = field % TRACKER_ROW_SIZE;
if (
fieldInRow >= channelFieldBase &&
fieldInRow < channelFieldBase + TRACKER_CHANNEL_FIELDS
) {
selectedMask |= 1 << (fieldInRow - channelFieldBase);
}
}
}
return encodePatternChannelRowState(activeFieldInCell, selectedMask);
};
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