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import { register } from "./register";
import { getSelectedElements } from "../scene";
import { getNonDeletedElements } from "../element";
import type {
ExcalidrawArrowElement,
ExcalidrawElbowArrowElement,
ExcalidrawElement,
NonDeleted,
NonDeletedSceneElementsMap,
} from "../element/types";
import { resizeMultipleElements } from "../element/resizeElements";
import type { AppClassProperties, AppState } from "../types";
import { arrayToMap } from "../utils";
import { CODES, KEYS } from "../keys";
import {
bindOrUnbindLinearElements,
isBindingEnabled,
} from "../element/binding";
import { updateFrameMembershipOfSelectedElements } from "../frame";
import { flipHorizontal, flipVertical } from "../components/icons";
import { CaptureUpdateAction } from "../store";
import {
isArrowElement,
isElbowArrow,
isLinearElement,
} from "../element/typeChecks";
import { mutateElement, newElementWith } from "../element/mutateElement";
import { deepCopyElement } from "../element/newElement";
import { getCommonBoundingBox } from "../element/bounds";
export const actionFlipHorizontal = register({
name: "flipHorizontal",
label: "labels.flipHorizontal",
icon: flipHorizontal,
trackEvent: { category: "element" },
perform: (elements, appState, _, app) => {
return {
elements: updateFrameMembershipOfSelectedElements(
flipSelectedElements(
elements,
app.scene.getNonDeletedElementsMap(),
appState,
"horizontal",
app,
),
appState,
app,
),
appState,
captureUpdate: CaptureUpdateAction.IMMEDIATELY,
};
},
keyTest: (event) => event.shiftKey && event.code === CODES.H,
});
export const actionFlipVertical = register({
name: "flipVertical",
label: "labels.flipVertical",
icon: flipVertical,
trackEvent: { category: "element" },
perform: (elements, appState, _, app) => {
return {
elements: updateFrameMembershipOfSelectedElements(
flipSelectedElements(
elements,
app.scene.getNonDeletedElementsMap(),
appState,
"vertical",
app,
),
appState,
app,
),
appState,
captureUpdate: CaptureUpdateAction.IMMEDIATELY,
};
},
keyTest: (event) =>
event.shiftKey && event.code === CODES.V && !event[KEYS.CTRL_OR_CMD],
});
const flipSelectedElements = (
elements: readonly ExcalidrawElement[],
elementsMap: NonDeletedSceneElementsMap,
appState: Readonly<AppState>,
flipDirection: "horizontal" | "vertical",
app: AppClassProperties,
) => {
const selectedElements = getSelectedElements(
getNonDeletedElements(elements),
appState,
{
includeBoundTextElement: true,
includeElementsInFrames: true,
},
);
const updatedElements = flipElements(
selectedElements,
elementsMap,
appState,
flipDirection,
app,
);
const updatedElementsMap = arrayToMap(updatedElements);
return elements.map(
(element) => updatedElementsMap.get(element.id) || element,
);
};
const flipElements = (
selectedElements: NonDeleted<ExcalidrawElement>[],
elementsMap: NonDeletedSceneElementsMap,
appState: AppState,
flipDirection: "horizontal" | "vertical",
app: AppClassProperties,
): ExcalidrawElement[] => {
if (
selectedElements.every(
(element) =>
isArrowElement(element) && (element.startBinding || element.endBinding),
)
) {
return selectedElements.map((element) => {
const _element = element as ExcalidrawArrowElement;
return newElementWith(_element, {
startArrowhead: _element.endArrowhead,
endArrowhead: _element.startArrowhead,
});
});
}
const { midX, midY } = getCommonBoundingBox(selectedElements);
resizeMultipleElements(
selectedElements,
elementsMap,
"nw",
app.scene,
new Map(
Array.from(elementsMap.values()).map((element) => [
element.id,
deepCopyElement(element),
]),
),
{
flipByX: flipDirection === "horizontal",
flipByY: flipDirection === "vertical",
shouldResizeFromCenter: true,
shouldMaintainAspectRatio: true,
},
);
bindOrUnbindLinearElements(
selectedElements.filter(isLinearElement),
elementsMap,
app.scene.getNonDeletedElements(),
app.scene,
isBindingEnabled(appState),
[],
appState.zoom,
);
// ---------------------------------------------------------------------------
// flipping arrow elements (and potentially other) makes the selection group
// "move" across the canvas because of how arrows can bump against the "wall"
// of the selection, so we need to center the group back to the original
// position so that repeated flips don't accumulate the offset
const { elbowArrows, otherElements } = selectedElements.reduce(
(
acc: {
elbowArrows: ExcalidrawElbowArrowElement[];
otherElements: ExcalidrawElement[];
},
element,
) =>
isElbowArrow(element)
? { ...acc, elbowArrows: acc.elbowArrows.concat(element) }
: { ...acc, otherElements: acc.otherElements.concat(element) },
{ elbowArrows: [], otherElements: [] },
);
const { midX: newMidX, midY: newMidY } =
getCommonBoundingBox(selectedElements);
const [diffX, diffY] = [midX - newMidX, midY - newMidY];
otherElements.forEach((element) =>
mutateElement(element, {
x: element.x + diffX,
y: element.y + diffY,
}),
);
elbowArrows.forEach((element) =>
mutateElement(element, {
x: element.x + diffX,
y: element.y + diffY,
}),
);
// ---------------------------------------------------------------------------
return selectedElements;
};
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