[nostalgia/gfx/studio/paletteeditor] Change move color mechanism to use drag/drop

release-notes.md

@@ -4,10 +4,11 @@
 * Add PaletteV5 to accommodate namespace change.
 * Add TileSheetV5. TileSheetV5 retains the bpp field for the sake of
   CompactTileSheet, but always store it pixel as 8 bpp for itself.
-* Replace file picker combo boxes with support for dragging files from the
+* Replace file picker combo boxes with a browse button and file picker, and
-  project explorer.
+  support for dragging files from the project explorer.
 * Add ability to create directories.
 * Add ability to add files to specific directories.
 * Add ability to delete files from the project explorer.
 * Ctrl-<num key> keyboard shortcuts for jumping between tabs.
 * Fix Palette Editor to ignore keyboard input when popups are open.
+* Palette Editor move color mechanism now uses drag and drop.

src/nostalgia/modules/gfx/src/studio/paletteeditor/commands/movecolorcommand.cpp

@@ -9,7 +9,10 @@
 namespace nostalgia::gfx {
 
 MoveColorCommand::MoveColorCommand(
-		Palette &pal, size_t page, size_t srcIdx, size_t dstIdx) noexcept:
+		Palette &pal,
+		size_t const page,
+		size_t const srcIdx,
+		size_t const dstIdx) noexcept:
 	m_pal(pal),
 	m_page(page),
 	m_srcIdx(srcIdx),
@@ -29,10 +32,18 @@ ox::Error MoveColorCommand::undo() noexcept {
 	return {};
 }
 
-void MoveColorCommand::moveColor(size_t srcIdx, size_t dstIdx) noexcept {
+void MoveColorCommand::moveColor(
+		size_t const srcIdx, size_t const dstIdx) noexcept {
+	{
 		auto const c = color(m_pal, m_page, srcIdx);
 		std::ignore = colors(m_pal, m_page).erase(srcIdx);
 		colors(m_pal, m_page).emplace(dstIdx, c);
 	}
+	{
+		auto name = std::move(m_pal.colorNames[srcIdx]);
+		std::ignore = m_pal.colorNames.erase(srcIdx);
+		m_pal.colorNames.emplace(dstIdx, std::move(name));
+	}
+}
 
 }

src/nostalgia/modules/gfx/src/studio/paletteeditor/paletteeditor-imgui.cpp

@@ -23,6 +23,15 @@ namespace nostalgia::gfx {
 
 namespace ig = studio::ig;
 
+struct ColorDragDrop {
+	static constexpr auto TypeName = "nostalgia.gfx.ColorDragDrop";
+	static constexpr auto TypeVersion = 1;
+	uint32_t i{};
+};
+
+OX_MODEL_BEGIN(ColorDragDrop)
+	OX_MODEL_FIELD(i)
+OX_MODEL_END()
 
 void PaletteEditorImGui::PageRenameDialog::draw(turbine::Context &tctx) noexcept {
 	if (!m_show) {
@@ -125,26 +134,6 @@ void PaletteEditorImGui::drawColorsEditor() noexcept {
 				m_selectedColorRow = ox::min(colorCnt(m_pal, m_page) - 1, m_selectedColorRow);
 				colorEditor = m_selectedColorRow < colorCnt(m_pal, m_page);
 			}
-			ImGui::SameLine();
-			ImGui::BeginDisabled(m_selectedColorRow <= 0);
-			{
-				if (ImGui::Button("Move Up", sz)) {
-					std::ignore = pushCommand<MoveColorCommand>(
-							m_pal, m_page, m_selectedColorRow, m_selectedColorRow - 1);
-					--m_selectedColorRow;
-				}
-			}
-			ImGui::EndDisabled();
-			ImGui::SameLine();
-			ImGui::BeginDisabled(m_selectedColorRow >= colorCnt(m_pal, m_page) - 1);
-			{
-				if (ImGui::Button("Move Down", sz)) {
-					std::ignore = pushCommand<MoveColorCommand>(
-							m_pal, m_page, m_selectedColorRow, m_selectedColorRow + 1);
-					++m_selectedColorRow;
-				}
-			}
-			ImGui::EndDisabled();
 		}
 		ImGui::EndDisabled();
 	}
@@ -179,6 +168,16 @@ void PaletteEditorImGui::drawColorsEditor() noexcept {
 						"##ColorRow", i == m_selectedColorRow, ImGuiSelectableFlags_SpanAllColumns)) {
 					m_selectedColorRow = i;
 				}
+				std::ignore = ig::dragDropSource([this, i] {
+					ImGui::Text("%s", m_pal.colorNames[i].c_str());
+					return ig::setDragDropPayload(ColorDragDrop{i});
+				}, ImGuiDragDropFlags_SourceAllowNullID);
+				if (ig::DragDropTarget const d; d) {
+					auto const [src, err] = ig::getDragDropPayload<ColorDragDrop>();
+					if (!err) {
+						std::ignore = pushCommand<MoveColorCommand>(m_pal, m_page, src.i, i);
+					}
+				}
 				++i;
 			}
 		}