basic undo support added

project/sequence.cpp

@@ -5,6 +5,7 @@
 #include <QDebug>
 
 Sequence::Sequence() {
+    undo_pointer = -1;
 }
 
 Sequence::~Sequence() {
@@ -120,3 +121,29 @@ void Sequence::split_at_playhead(long frame) {
 		}
 	}
 }
+
+void Sequence::undo_add_current() {
+    undo_pointer++;
+    undo_stack.resize(undo_pointer);
+    undo_stack.append(clips);
+    qDebug() << "a pointer:" << undo_pointer << undo_stack.size();
+}
+
+void Sequence::undo() {
+    if (undo_pointer > 0) {
+        undo_pointer--;
+        clips = undo_stack[undo_pointer];
+    } else {
+        qDebug() << "[INFO] No more undos";
+    }
+    qDebug() << "u pointer:" << undo_pointer << undo_stack.size();
+}
+void Sequence::redo() {
+    if (undo_pointer == undo_stack.size() - 1) {
+        qDebug() << "[INFO] No more redos";
+    } else {
+        undo_pointer++;
+        clips = undo_stack[undo_pointer];
+    }
+    qDebug() << "r pointer:" << undo_pointer << undo_stack.size();
+}

project/sequence.h

@@ -1,6 +1,8 @@
 #ifndef SEQUENCE_H
 #define SEQUENCE_H
 
+#define UNDO_LIMIT 100
+
 #include <QVector>
 
 #include "project/clip.h"
@@ -25,8 +27,16 @@ public:
 	float frame_rate;
 	int audio_frequency;
 	int audio_layout;
+
+    void undo_add_current();
+    void undo();
+    void redo();
 private:
 	QList<Clip> clips;
+
+    QVector<QList<Clip>> undo_stack;
+    int undo_pointer;
+    int undo_stack_start;
 };
 
 #endif // SEQUENCE_H