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Image Editor - Allow undoing back to the original state when exceeds the undo limit.

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Alan Evans 2019-05-22 13:28:02 -03:00 committed by GitHub
parent 10ad3fbf82
commit 0a7970ad0c
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1 changed files with 6 additions and 2 deletions
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8
src/org/thoughtcrime/securesms/imageeditor/model/ElementStack.java
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@ -13,7 +13,9 @@ import java.util.Stack;
* <p>
* Elements are mutable, so this stack serializes the element and keeps a stack of serialized data.
* <p>
* The stack has a {@link #limit} and if it exceeds that limit during a push the earliest item is removed.
* The stack has a {@link #limit} and if it exceeds that limit during a push the second to earliest item
* is removed so that it can always go back to the first state. Effectively collapsing the history for
* the start of the stack.
*/
final class ElementStack implements Parcelable {
@ -35,6 +37,8 @@ final class ElementStack implements Parcelable {
/**
* Pushes an element to the stack iff the element's serialized value is different to any found at
* the top of the stack.
* <p>
* Removes the second to earliest item if it is overflowing.
*
* @param element new editor element state.
* @return true iff the pushed item was different to the top item.
@ -46,7 +50,7 @@ final class ElementStack implements Parcelable {
if (push) {
stack.push(bytes);
if (stack.size() > limit) {
stack.remove(0);
stack.remove(1);
}
}
return push;