1 files changed, 68 insertions, 0 deletions
diff --git a/src/revolution/homebuttonLib/HBMFrameController.cpp b/src/revolution/homebuttonLib/HBMFrameController.cpp
new file mode 100644
index 0000000000..dccaf15996
--- /dev/null
+++ b/src/revolution/homebuttonLib/HBMFrameController.cpp
@@ -0,0 +1,68 @@
+
+#include "HBMFrameController.h"
+
+namespace homebutton {
+
+    void FrameController::init(int anm_type, f32 max_frame, f32 min_frame, f32 delta) {
+        mAnmType = anm_type;
+        mMaxFrame = max_frame;
+        mMinFrame = min_frame;
+
+        mDelta = delta;
+        mState = ANIM_STATE_STOP;
+        mbAlternateBack = false;
+
+        initFrame();
+    }
+
+    void FrameController::initFrame() {
+        mFrame = mAnmType == ANIM_TYPE_BACKWARD ? mMaxFrame : mMinFrame;
+    }
+
+    void FrameController::calc() {
+        if (mState != ANIM_STATE_PLAY) {
+            return;
+        }
+
+        switch (mAnmType) {
+        case ANIM_TYPE_FORWARD:
+            if ((mFrame += mDelta) >= getLastFrame()) {
+                mFrame = getLastFrame();
+                stop();
+            }
+
+            break;
+
+        case ANIM_TYPE_BACKWARD:
+            if ((mFrame -= mDelta) <= mMinFrame) {
+                mFrame = mMinFrame;
+                stop();
+            }
+
+            break;
+
+        case ANIM_TYPE_LOOP:
+            if ((mFrame += mDelta) >= mMaxFrame) {
+                mFrame -= mMaxFrame - mMinFrame;
+            }
+
+            break;
+
+        case ANIM_TYPE_ALTERNATE:
+            if (!mbAlternateBack) {
+                if ((mFrame += mDelta) >= getLastFrame()) {
+                    mFrame = getLastFrame();
+                    mbAlternateBack = true;
+                }
+            } else {
+                if ((mFrame -= mDelta) <= mMinFrame) {
+                    mFrame = mMinFrame;
+                    mbAlternateBack = false;
+                }
+            }
+
+            break;
+        }
+    }
+
+}  // namespace homebutton