smig/excalidraw
1
0
Fork 0
mirror of https://github.com/excalidraw/excalidraw.git synced 2025-05-03 10:00:07 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Encapsulate undo and redo actions within history

Browse source
This commit is contained in:
Gasim Gasimzada 2020-01-06 21:38:32 +04:00
parent 01a922bf20
commit 9eeb4b10af
2 changed files with 25 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

23
src/history.ts
View file

@ -34,6 +34,29 @@ class SceneHistory {
this.skipRecording();
}
redoOnce(elements: ExcalidrawElement[]) {
const currentEntry = this.generateCurrentEntry(elements);
const entryToRestore = this.redoStack.pop();
if (entryToRestore !== undefined) {
this.restoreEntry(elements, entryToRestore);
this.stateHistory.push(currentEntry);
}
}
undoOnce(elements: ExcalidrawElement[]) {
const currentEntry = this.generateCurrentEntry(elements);
let entryToRestore = this.stateHistory.pop();
// If nothing was changed since last, take the previous one
if (currentEntry === entryToRestore) {
entryToRestore = this.stateHistory.pop();
}
if (entryToRestore !== undefined) {
this.restoreEntry(elements, entryToRestore);
this.redoStack.push(currentEntry);
}
}
isRecording() {
return this.recording;
}

16
src/index.tsx
View file

@ -206,22 +206,10 @@ class App extends React.Component<{}, AppState> {
const currentEntry = history.generateCurrentEntry(elements);
if (event.shiftKey) {
// Redo action
const entryToRestore = history.redoStack.pop();
if (entryToRestore !== undefined) {
history.restoreEntry(elements, entryToRestore);
history.stateHistory.push(currentEntry);
}
history.redoOnce(elements);
} else {
// undo action
let lastEntry = history.stateHistory.pop();
// If nothing was changed since last, take the previous one
if (currentEntry === lastEntry) {
lastEntry = history.stateHistory.pop();
}
if (lastEntry !== undefined) {
history.restoreEntry(elements, lastEntry);
history.redoStack.push(currentEntry);
}
history.undoOnce(elements);
}
this.forceUpdate();
event.preventDefault();