Spreadsheet: Update cell colors interactively while picking

Spreadsheet cells now show a real-time preview of the currently selected
color while the user is picking in `GUI::ColorPicker`

Userland/Applications/Spreadsheet/SpreadsheetWidget.cpp

@@ -495,21 +495,70 @@ void SpreadsheetWidget::change_cell_static_color_format(Spreadsheet::FormatType
 {
  VERIFY(current_worksheet_if_available());
 
- auto dialog = GUI::ColorPicker::construct(Color::White, window(), "Select Color");
- if (dialog->exec() == GUI::Dialog::ExecResult::OK) {
+ auto preview_color_in_selected_cells = [this, format_type](Gfx::Color color) {
+ for (auto& position : current_worksheet_if_available()->selected_cells()) {
+ auto* cell = current_worksheet_if_available()->at(position);
+ auto previous_type_metadata = cell->type_metadata();
+ if (format_type == Spreadsheet::FormatType::Background)
+ cell->type_metadata().static_format.background_color = color;
+ else
+ cell->type_metadata().static_format.foreground_color = color;
+ update();
+ }
+ };
+ auto apply_color_to_selected_cells = [this, format_type](Gfx::Color color) {
  Vector<CellChange> cell_changes;
  for (auto& position : current_worksheet_if_available()->selected_cells()) {
  auto* cell = current_worksheet_if_available()->at(position);
  auto previous_type_metadata = cell->type_metadata();
  if (format_type == Spreadsheet::FormatType::Background)
- cell->type_metadata().static_format.background_color = dialog->color();
+ cell->type_metadata().static_format.background_color = color;
  else
- cell->type_metadata().static_format.foreground_color = dialog->color();
+ cell->type_metadata().static_format.foreground_color = color;
  cell_changes.append(CellChange(*cell, previous_type_metadata));
  }
  undo_stack().push(make<CellsUndoMetadataCommand>(move(cell_changes)));
  window()->set_modified(true);
- }
+ };
+ auto get_selection_color = [this, format_type](void) {
+ // FIXME: Not sure what to do if a selection of multiple cells has more than one color.
+ // For now we just grab the first one we see and pass that to GUI::ColorPicker
+ for (auto& position : current_worksheet_if_available()->selected_cells()) {
+ auto* cell = current_worksheet_if_available()->at(position);
+ auto previous_type_metadata = cell->type_metadata();
+ if (format_type == Spreadsheet::FormatType::Background)
+ return cell->type_metadata().static_format.background_color.value_or(Color::White);
+ else
+ return cell->type_metadata().static_format.foreground_color.value_or(Color::White);
+ }
+ return Color(Color::White);
+ };
+
+ // FIXME: Hack, we want to restore the cell metadata to the actual state before computing the change
+ auto get_current_selection_metadata = [this](void) {
+ Vector<CellTypeMetadata> cell_metadata;
+ for (auto& position : current_worksheet_if_available()->selected_cells()) {
+ auto* cell = current_worksheet_if_available()->at(position);
+ cell_metadata.append(cell->type_metadata());
+ }
+ return cell_metadata;
+ };
+ auto restore_current_selection_metadata = [this](Vector<CellTypeMetadata> metadata) {
+ for (auto& position : current_worksheet_if_available()->selected_cells()) {
+ auto* cell = current_worksheet_if_available()->at(position);
+ cell->type_metadata() = metadata.take_first();
+ }
+ };
+
+ auto dialog = GUI::ColorPicker::construct(get_selection_color(), window(), "Select Color");
+ dialog->on_color_changed = [&preview_color_in_selected_cells](Gfx::Color color) {
+ preview_color_in_selected_cells(color);
+ };
+ Vector<CellTypeMetadata> preserved_state = get_current_selection_metadata();
+ auto result = dialog->exec();
+ restore_current_selection_metadata(preserved_state);
+ if (result == GUI::Dialog::ExecResult::OK)
+ apply_color_to_selected_cells(dialog->color());
 }
 
 void SpreadsheetWidget::save(String const& filename, Core::File& file)