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Add a C++ Filter Model class (#1685)
Add a C++ Filter Model class This matches the FilterModel in the Rust API.
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Simon Hausmann
GitHub
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4 changed files with 376 additions and 0 deletions
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api/cpp/tests/models.cpp
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api/cpp/tests/models.cpp
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// Copyright © SixtyFPS GmbH <info@slint-ui.com>
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// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
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#include <chrono>
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#define CATCH_CONFIG_MAIN
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#include "catch2/catch.hpp"
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#include <slint.h>
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struct ModelObserver : public slint::private_api::AbstractRepeaterView
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{
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void row_added(int index, int count) override { added_rows.push_back(Range { index, count }); }
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void row_changed(int index) override { changed_rows.push_back(index); }
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void row_removed(int index, int count) override
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{
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removed_rows.push_back(Range { index, count });
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}
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void reset() override { model_reset = true; }
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void clear()
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{
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added_rows.clear();
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changed_rows.clear();
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removed_rows.clear();
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model_reset = false;
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}
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struct Range
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{
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int row_index;
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int count;
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bool operator==(const Range &) const = default;
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};
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std::vector<Range> added_rows;
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std::vector<int> changed_rows;
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std::vector<Range> removed_rows;
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bool model_reset = false;
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};
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std::ostream &operator<<(std::ostream &os, const ModelObserver::Range &value)
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{
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os << "{ row_index: " << value.row_index << "; count: " << value.count << " }";
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return os;
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}
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SCENARIO("Filtering Model")
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{
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auto vec_model =
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std::make_shared<slint::VectorModel<int>>(std::vector<int> { 1, 2, 3, 4, 5, 6 });
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auto even_rows = std::make_shared<slint::FilterModel<int>>(
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vec_model, [](auto value) { return value % 2 == 0; });
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REQUIRE(even_rows->row_count() == 3);
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REQUIRE(even_rows->row_data(0) == 2);
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REQUIRE(even_rows->row_data(1) == 4);
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REQUIRE(even_rows->row_data(2) == 6);
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}
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SCENARIO("Filtering Insert")
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{
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auto vec_model =
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std::make_shared<slint::VectorModel<int>>(std::vector<int> { 1, 2, 3, 4, 5, 6 });
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auto even_rows = std::make_shared<slint::FilterModel<int>>(
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vec_model, [](auto value) { return value % 2 == 0; });
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auto observer = std::make_shared<ModelObserver>();
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even_rows->attach_peer(observer);
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REQUIRE(even_rows->row_count() == 3);
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REQUIRE(even_rows->row_data(0) == 2);
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REQUIRE(even_rows->row_data(1) == 4);
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REQUIRE(even_rows->row_data(2) == 6);
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vec_model->insert(2, 10);
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REQUIRE(observer->added_rows.size() == 1);
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REQUIRE(observer->added_rows[0] == ModelObserver::Range { 1, 1 });
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REQUIRE(observer->changed_rows.empty());
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REQUIRE(observer->removed_rows.empty());
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REQUIRE(!observer->model_reset);
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observer->clear();
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REQUIRE(even_rows->row_count() == 4);
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REQUIRE(even_rows->row_data(0) == 2);
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REQUIRE(even_rows->row_data(1) == 10);
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REQUIRE(even_rows->row_data(2) == 4);
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REQUIRE(even_rows->row_data(3) == 6);
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// insert odd number -> no change
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vec_model->insert(0, 1);
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REQUIRE(observer->added_rows.empty());
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REQUIRE(observer->changed_rows.empty());
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REQUIRE(observer->removed_rows.empty());
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REQUIRE(!observer->model_reset);
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observer->clear();
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}
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SCENARIO("Filtering Change")
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{
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auto vec_model =
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std::make_shared<slint::VectorModel<int>>(std::vector<int> { 1, 2, 3, 4, 5, 6 });
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auto even_rows = std::make_shared<slint::FilterModel<int>>(
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vec_model, [](auto value) { return value % 2 == 0; });
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auto observer = std::make_shared<ModelObserver>();
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even_rows->attach_peer(observer);
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REQUIRE(even_rows->row_count() == 3);
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REQUIRE(even_rows->row_data(0) == 2);
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REQUIRE(even_rows->row_data(1) == 4);
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REQUIRE(even_rows->row_data(2) == 6);
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// change leading odd 1 to odd 3 -> no change
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vec_model->set_row_data(0, 3);
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REQUIRE(observer->added_rows.empty());
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REQUIRE(observer->changed_rows.empty());
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REQUIRE(observer->removed_rows.empty());
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REQUIRE(!observer->model_reset);
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REQUIRE(even_rows->row_count() == 3);
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REQUIRE(even_rows->row_data(0) == 2);
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REQUIRE(even_rows->row_data(1) == 4);
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REQUIRE(even_rows->row_data(2) == 6);
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// change trailing 6 to odd 1 -> one row less
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vec_model->set_row_data(5, 1);
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REQUIRE(observer->added_rows.empty());
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REQUIRE(observer->changed_rows.empty());
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REQUIRE(observer->removed_rows.size() == 1);
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REQUIRE(observer->removed_rows[0] == ModelObserver::Range { 2, 1 });
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REQUIRE(!observer->model_reset);
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observer->clear();
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REQUIRE(even_rows->row_count() == 2);
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REQUIRE(even_rows->row_data(0) == 2);
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REQUIRE(even_rows->row_data(1) == 4);
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// change leading odd 3 to even 0 -> one new row
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vec_model->set_row_data(0, 0);
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REQUIRE(observer->added_rows.size() == 1);
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REQUIRE(observer->added_rows[0] == ModelObserver::Range { 0, 1 });
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REQUIRE(observer->changed_rows.empty());
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REQUIRE(observer->removed_rows.empty());
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REQUIRE(!observer->model_reset);
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observer->clear();
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REQUIRE(even_rows->row_count() == 3);
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REQUIRE(even_rows->row_data(0) == 0);
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REQUIRE(even_rows->row_data(1) == 2);
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REQUIRE(even_rows->row_data(2) == 4);
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// change trailing filtered 4 to even 0 -> one changed row
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vec_model->set_row_data(3, 0);
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REQUIRE(observer->added_rows.empty());
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REQUIRE(observer->changed_rows.size() == 1);
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REQUIRE(observer->changed_rows[0] == 2);
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REQUIRE(observer->removed_rows.empty());
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REQUIRE(!observer->model_reset);
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observer->clear();
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REQUIRE(even_rows->row_count() == 3);
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REQUIRE(even_rows->row_data(0) == 0);
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REQUIRE(even_rows->row_data(1) == 2);
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REQUIRE(even_rows->row_data(2) == 0);
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}
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SCENARIO("Filtering Model Remove")
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{
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auto vec_model =
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std::make_shared<slint::VectorModel<int>>(std::vector<int> { 1, 2, 3, 4, 5, 6 });
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auto even_rows = std::make_shared<slint::FilterModel<int>>(
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vec_model, [](auto value) { return value % 2 == 0; });
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auto observer = std::make_shared<ModelObserver>();
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even_rows->attach_peer(observer);
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REQUIRE(even_rows->row_count() == 3);
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REQUIRE(even_rows->row_data(0) == 2);
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REQUIRE(even_rows->row_data(1) == 4);
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REQUIRE(even_rows->row_data(2) == 6);
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// Erase unrelated row
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vec_model->erase(0);
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REQUIRE(observer->added_rows.empty());
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REQUIRE(observer->changed_rows.empty());
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REQUIRE(observer->removed_rows.empty());
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REQUIRE(!observer->model_reset);
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observer->clear();
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REQUIRE(even_rows->row_count() == 3);
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REQUIRE(even_rows->row_data(0) == 2);
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REQUIRE(even_rows->row_data(1) == 4);
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REQUIRE(even_rows->row_data(2) == 6);
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// Erase trailing even 6
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vec_model->erase(4);
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REQUIRE(observer->added_rows.empty());
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REQUIRE(observer->changed_rows.empty());
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REQUIRE(observer->removed_rows.size() == 1);
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REQUIRE(observer->removed_rows[0] == ModelObserver::Range { 2, 1 });
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REQUIRE(!observer->model_reset);
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observer->clear();
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REQUIRE(even_rows->row_count() == 2);
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REQUIRE(even_rows->row_data(0) == 2);
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REQUIRE(even_rows->row_data(1) == 4);
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}
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