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Diffstat (limited to 'src/gui/ComboBox.cpp')
| -rw-r--r-- | src/gui/ComboBox.cpp | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/gui/ComboBox.cpp b/src/gui/ComboBox.cpp new file mode 100644 index 0000000..b96b3ae --- /dev/null +++ b/src/gui/ComboBox.cpp @@ -0,0 +1,161 @@ +#include "../../include/gui/ComboBox.hpp" +#include <mglpp/graphics/Rectangle.hpp> +#include <mglpp/graphics/Font.hpp> +#include <mglpp/window/Window.hpp> +#include <mglpp/window/Event.hpp> +#include <assert.h> + +namespace gsr { + static const float padding_top = 10.0f; + static const float padding_bottom = 10.0f; + static const float padding_left = 10.0f; + static const float padding_right = 10.0f; + + ComboBox::ComboBox(mgl::Font *font) : font(font) { + assert(font); + } + + bool ComboBox::on_event(mgl::Event &event, mgl::Window&) { + if(event.type == mgl::Event::MouseButtonPressed && event.mouse_button.button == mgl::Mouse::Left) { + const mgl::vec2f mouse_pos = { (float)event.mouse_button.x, (float)event.mouse_button.y }; + const mgl::vec2f item_size(max_size.x, font->get_character_size() + padding_top + padding_bottom); + + if(show_dropdown && !items.empty()) { + mgl::vec2f pos = position + mgl::vec2f(padding_left, padding_top); + pos.y += items[selected_item].text.get_bounds().size.y + padding_top + padding_bottom; + + for(size_t i = 0; i < items.size(); ++i) { + Item &item = items[i]; + const mgl::FloatRect text_bounds = item.text.get_bounds(); + if(mgl::FloatRect(pos - mgl::vec2f(padding_left, padding_top), item_size).contains(mouse_pos)) { + selected_item = i; + show_dropdown = false; + return false; + } + pos.y += text_bounds.size.y + padding_top + padding_bottom; + } + } + + if(mgl::FloatRect(position, item_size).contains(mouse_pos)) { + show_dropdown = !show_dropdown; + move_to_top = true; + } else { + show_dropdown = false; + } + } + return true; + } + + static void draw_rectangle_outline(mgl::Window &window, mgl::vec2f pos, mgl::vec2f size, mgl::Color color, float border_size) { + // Green line at top + { + mgl::Rectangle rect({ size.x, border_size }); + rect.set_position(pos); + rect.set_color(color); + window.draw(rect); + } + + // Green line at bottom + { + mgl::Rectangle rect({ size.x, border_size }); + rect.set_position(pos + mgl::vec2f(0.0f, size.y - border_size)); + rect.set_color(color); + window.draw(rect); + } + + // Green line at left + { + mgl::Rectangle rect({ border_size, size.y - border_size * 2 }); + rect.set_position(pos + mgl::vec2f(0, border_size)); + rect.set_color(color); + window.draw(rect); + } + + // Green line at right + { + mgl::Rectangle rect({ border_size, size.y - border_size * 2 }); + rect.set_position(pos + mgl::vec2f(size.x - border_size, border_size)); + rect.set_color(color); + window.draw(rect); + } + } + + void ComboBox::draw(mgl::Window &window) { + update_if_dirty(); + + if(items.empty()) + return; + + const mgl::vec2f item_size(max_size.x, font->get_character_size() + padding_top + padding_bottom); + const mgl::vec2i mouse_pos = window.get_mouse_position(); + bool inside = false; + + mgl::Rectangle background(position, mgl::vec2f(max_size.x, item_size.y)); + if(show_dropdown) { + background.set_size(max_size); + background.set_color(mgl::Color(0, 0, 0)); + } else { + background.set_color(mgl::Color(0, 0, 0, 250)); + } + window.draw(background); + + mgl::vec2f pos = position + mgl::vec2f(padding_left, padding_top); + + Item &item = items[selected_item]; + item.text.set_position(pos); + if(show_dropdown) { + const int border_size = 3; + const mgl::Color border_color(118, 185, 0); + draw_rectangle_outline(window, pos - mgl::vec2f(padding_left, padding_top), item_size, border_color, border_size); + } + window.draw(item.text); + pos.y += item.text.get_bounds().size.y + padding_top + padding_bottom; + + for(size_t i = 0; i < items.size(); ++i) { + Item &item = items[i]; + item.text.set_position(pos); + const mgl::FloatRect text_bounds = item.text.get_bounds(); + + if(show_dropdown) { + if(!inside) { + inside = mgl::FloatRect(text_bounds.position - mgl::vec2f(padding_left, padding_top), item_size).contains({ (float)mouse_pos.x, (float)mouse_pos.y }); + if(inside) { + mgl::Rectangle item_background(text_bounds.position - mgl::vec2f(padding_left, padding_top), item_size); + item_background.set_color(mgl::Color(118, 185, 0)); + window.draw(item_background); + } else { + /*const int border_size = 3; + const mgl::Color border_color(150, 150, 150); + draw_rectangle_outline(window, text_bounds.position, item_size, border_color, border_size);*/ + } + } + window.draw(item.text); + } + + pos.y += text_bounds.size.y + padding_top + padding_bottom; + } + } + + void ComboBox::add_item(const std::string &text, const std::string &id) { + items.push_back({mgl::Text(text, *font), id}); + dirty = true; + } + + void ComboBox::update_if_dirty() { + if(!dirty) + return; + + max_size = { 0.0f, font->get_character_size() + padding_top + padding_bottom }; + for(Item &item : items) { + const mgl::vec2f bounds = item.text.get_bounds().size; + max_size.x = std::max(max_size.x, bounds.x + padding_left + padding_right); + max_size.y += bounds.y + padding_top + padding_bottom; + } + dirty = false; + } + + mgl::vec2f ComboBox::get_size() { + update_if_dirty(); + return { max_size.x, font->get_character_size() + padding_top + padding_bottom }; + } +}
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