Add document frame move coverage

src/document/document.cpp

@@ -55,6 +55,15 @@ namespace {
     return pp::foundation::Status::success();
 }
 
+[[nodiscard]] pp::foundation::Status validate_frame_index(std::size_t index, std::size_t frame_count) noexcept
+{
+    if (index >= frame_count) {
+        return pp::foundation::Status::out_of_range("frame index is outside the document");
+    }
+
+    return pp::foundation::Status::success();
+}
+
 }
 
 pp::foundation::Result<CanvasDocument> CanvasDocument::create(DocumentConfig config)
@@ -96,6 +105,15 @@ std::size_t CanvasDocument::active_frame_index() const noexcept
     return active_frame_index_;
 }
 
+std::uint64_t CanvasDocument::animation_duration_ms() const noexcept
+{
+    std::uint64_t duration = 0;
+    for (const auto& frame : frames_) {
+        duration += frame.duration_ms;
+    }
+    return duration;
+}
+
 std::span<const Layer> CanvasDocument::layers() const noexcept
 {
     return layers_;
@@ -265,9 +283,10 @@ pp::foundation::Result<std::size_t> CanvasDocument::add_frame(std::uint32_t dura
 
 pp::foundation::Result<std::size_t> CanvasDocument::duplicate_frame(std::size_t index)
 {
-    if (index >= frames_.size()) {
+    const auto index_status = validate_frame_index(index, frames_.size());
+    if (!index_status.ok()) {
         return pp::foundation::Result<std::size_t>::failure(
-            pp::foundation::Status::out_of_range("frame index is outside the document"));
+            index_status);
     }
 
     if (frames_.size() >= max_frame_count) {
@@ -283,8 +302,9 @@ pp::foundation::Result<std::size_t> CanvasDocument::duplicate_frame(std::size_t
 
 pp::foundation::Status CanvasDocument::remove_frame(std::size_t index)
 {
-    if (index >= frames_.size()) {
-        return pp::foundation::Status::out_of_range("frame index is outside the document");
+    const auto index_status = validate_frame_index(index, frames_.size());
+    if (!index_status.ok()) {
+        return index_status;
     }
 
     if (frames_.size() == 1U) {
@@ -301,10 +321,36 @@ pp::foundation::Status CanvasDocument::remove_frame(std::size_t index)
     return pp::foundation::Status::success();
 }
 
+pp::foundation::Status CanvasDocument::move_frame(std::size_t from, std::size_t to)
+{
+    if (from >= frames_.size() || to >= frames_.size()) {
+        return pp::foundation::Status::out_of_range("frame index is outside the document");
+    }
+
+    if (from == to) {
+        return pp::foundation::Status::success();
+    }
+
+    const auto frame = frames_[from];
+    frames_.erase(frames_.begin() + static_cast<std::ptrdiff_t>(from));
+    frames_.insert(frames_.begin() + static_cast<std::ptrdiff_t>(to), frame);
+
+    if (active_frame_index_ == from) {
+        active_frame_index_ = to;
+    } else if (from < active_frame_index_ && active_frame_index_ <= to) {
+        --active_frame_index_;
+    } else if (to <= active_frame_index_ && active_frame_index_ < from) {
+        ++active_frame_index_;
+    }
+
+    return pp::foundation::Status::success();
+}
+
 pp::foundation::Status CanvasDocument::set_frame_duration(std::size_t index, std::uint32_t duration_ms) noexcept
 {
-    if (index >= frames_.size()) {
-        return pp::foundation::Status::out_of_range("frame index is outside the document");
+    const auto index_status = validate_frame_index(index, frames_.size());
+    if (!index_status.ok()) {
+        return index_status;
     }
 
     if (duration_ms < min_frame_duration_ms) {
@@ -317,8 +363,9 @@ pp::foundation::Status CanvasDocument::set_frame_duration(std::size_t index, std
 
 pp::foundation::Status CanvasDocument::set_active_frame(std::size_t index) noexcept
 {
-    if (index >= frames_.size()) {
-        return pp::foundation::Status::out_of_range("frame index is outside the document");
+    const auto index_status = validate_frame_index(index, frames_.size());
+    if (!index_status.ok()) {
+        return index_status;
     }
 
     active_frame_index_ = index;