transition code rewrite for #110

project/transition.cpp

@@ -0,0 +1,51 @@
+#include "transition.h"
+
+#include "mainwindow.h"
+#include "clip.h"
+#include "sequence.h"
+#include "debug.h"
+
+#include "effects/internal/crossdissolvetransition.h"
+#include "effects/internal/linearfadetransition.h"
+#include "effects/internal/exponentialfadetransition.h"
+#include "effects/internal/logarithmicfadetransition.h"
+
+#include <QMessageBox>
+
+Transition::Transition(Clip* c, const EffectMeta* em) : Effect(c, em) {
+    add_row("Length:")->add_field(EFFECT_FIELD_DOUBLE);
+}
+
+int Transition::copy(Clip *c) {
+    int copy_index = create_transition(c, meta);
+    c->sequence->transitions.at(copy_index)->length = length;
+    return copy_index;
+}
+
+Transition* get_transition_from_meta(Clip* c, const EffectMeta* em) {
+    if (!em->filename.isEmpty()) {
+        // load effect from file
+        return new Transition(c, em);
+    } else if (em->internal >= 0 && em->internal < TRANSITION_INTERNAL_COUNT) {
+        // must be an internal effect
+        switch (em->internal) {
+        case TRANSITION_INTERNAL_CROSSDISSOLVE: return new CrossDissolveTransition(c, em);
+        case TRANSITION_INTERNAL_LINEARFADE: return new LinearFadeTransition(c, em);
+        case TRANSITION_INTERNAL_EXPONENTIALFADE: return new ExponentialFadeTransition(c, em);
+        case TRANSITION_INTERNAL_LOGARITHMICFADE: return new LogarithmicFadeTransition(c, em);
+        }
+    } else {
+        dout << "[ERROR] Invalid transition data";
+        QMessageBox::critical(mainWindow, "Invalid transition", "No candidate for transition '" + em->name + "'. This transition may be corrupt. Try reinstalling it or Olive.");
+    }
+    return NULL;
+}
+
+int create_transition(Clip* c, const EffectMeta* em) {
+    Transition* t = get_transition_from_meta(c, em);
+    if (t != NULL) {
+        c->sequence->transitions.append(t);
+        return c->sequence->transitions.size() - 1;
+    }
+    return -1;
+}