Multilabel support & Label refactoring (#17)

Reviewed-on: moritz/ptouch-prnt#17

tests/mocks/MockCairoWrapper.hpp

@@ -0,0 +1,84 @@
+/*
+    ptrnt - print labels on linux
+    Copyright (C) 2025  Moritz Martinius
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
+#pragma once
+
+#include <gmock/gmock.h>
+#include "graphics/interface/ICairoWrapper.hpp"
+
+namespace ptprnt::graphics {
+
+/**
+ * @brief GMock implementation of ICairoWrapper for unit testing
+ *
+ * This mock allows tests to verify that the Label class correctly interacts
+ * with the Cairo/Pango API without requiring actual graphics rendering.
+ */
+class MockCairoWrapper : public ICairoWrapper {
+   public:
+    // Cairo image surface functions
+    MOCK_METHOD(cairo_surface_t*, cairo_image_surface_create, (cairo_format_t format, int width, int height),
+                (override));
+    MOCK_METHOD(void, cairo_surface_destroy, (cairo_surface_t * surface), (override));
+    MOCK_METHOD(void, cairo_surface_flush, (cairo_surface_t * surface), (override));
+    MOCK_METHOD(void, cairo_surface_mark_dirty, (cairo_surface_t * surface), (override));
+    MOCK_METHOD(cairo_status_t, cairo_surface_status, (cairo_surface_t * surface), (override));
+    MOCK_METHOD(cairo_format_t, cairo_image_surface_get_format, (cairo_surface_t * surface), (override));
+    MOCK_METHOD(int, cairo_image_surface_get_width, (cairo_surface_t * surface), (override));
+    MOCK_METHOD(int, cairo_image_surface_get_height, (cairo_surface_t * surface), (override));
+    MOCK_METHOD(int, cairo_image_surface_get_stride, (cairo_surface_t * surface), (override));
+    MOCK_METHOD(unsigned char*, cairo_image_surface_get_data, (cairo_surface_t * surface), (override));
+    MOCK_METHOD(cairo_status_t, cairo_surface_write_to_png, (cairo_surface_t * surface, const char* filename),
+                (override));
+
+    // Cairo context functions
+    MOCK_METHOD(cairo_t*, cairo_create, (cairo_surface_t * surface), (override));
+    MOCK_METHOD(void, cairo_destroy, (cairo_t * cr), (override));
+    MOCK_METHOD(void, cairo_move_to, (cairo_t * cr, double x, double y), (override));
+    MOCK_METHOD(void, cairo_set_source_rgb, (cairo_t * cr, double red, double green, double blue), (override));
+
+    // Pango-Cairo functions
+    MOCK_METHOD(PangoFontMap*, pango_cairo_font_map_new, (), (override));
+    MOCK_METHOD(PangoContext*, pango_cairo_create_context, (cairo_t * cr), (override));
+    MOCK_METHOD(void, pango_cairo_show_layout, (cairo_t * cr, PangoLayout* layout), (override));
+
+    // Pango layout functions
+    MOCK_METHOD(PangoLayout*, pango_layout_new, (PangoContext * context), (override));
+    MOCK_METHOD(void, pango_layout_set_font_description, (PangoLayout * layout, const PangoFontDescription* desc),
+                (override));
+    MOCK_METHOD(void, pango_layout_set_text, (PangoLayout * layout, const char* text, int length), (override));
+    MOCK_METHOD(void, pango_layout_set_height, (PangoLayout * layout, int height), (override));
+    MOCK_METHOD(void, pango_layout_set_alignment, (PangoLayout * layout, PangoAlignment alignment), (override));
+    MOCK_METHOD(void, pango_layout_set_justify, (PangoLayout * layout, gboolean justify), (override));
+#if PANGO_VERSION_MAJOR >= 1 && PANGO_VERSION_MINOR >= 50
+    MOCK_METHOD(void, pango_layout_set_justify_last_line, (PangoLayout * layout, gboolean justify), (override));
+#endif
+    MOCK_METHOD(void, pango_layout_get_size, (PangoLayout * layout, int* width, int* height), (override));
+
+    // Pango font description functions
+    MOCK_METHOD(PangoFontDescription*, pango_font_description_new, (), (override));
+    MOCK_METHOD(void, pango_font_description_set_size, (PangoFontDescription * desc, gint size), (override));
+    MOCK_METHOD(void, pango_font_description_set_family, (PangoFontDescription * desc, const char* family),
+                (override));
+
+    // GObject reference counting
+    MOCK_METHOD(void, g_object_unref, (gpointer object), (override));
+};
+
+}  // namespace ptprnt::graphics