101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
#include <cmath>
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#include <SDL2/SDL_render.h>
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#include <basic_widgets/core/math.hpp>
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#include <basic_widgets/w/button_impl.hpp>
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using namespace bwidgets;
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ButtonImpl::ButtonImpl(Widget* parent) noexcept : WidgetImpl {parent}, _caption {this}
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{
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MouseHandlerImpl::enable_mouse_handler(&_widget_area, &_viewport);
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_caption.alignment = Caption::Alignment::CENTER;
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_caption.render_mode(Font::RenderMode::BLENDED);
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border_gradient = [this](int len, int pos, float divider) -> Color {
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const auto& end_color = MouseHandlerImpl::hovered() ? color_bg_hover : color_bg;
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const auto start_color = end_color / divider;
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const auto factor = linear(pos, 0, len);
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return lerp(start_color, end_color, factor);
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};
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}
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auto ButtonImpl::size() const noexcept -> Size
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{
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return _caption.size() + border_size * 2;
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}
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auto ButtonImpl::text() const noexcept -> const std::string&
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{
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return _caption.text();
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}
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void ButtonImpl::text(const std::string& txt)
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{
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_caption.text(txt);
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_handle_geometry_change(_viewport);
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}
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void ButtonImpl::_handle_font_change(const std::shared_ptr<Font>& f)
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{
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_caption.font(f);
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_handle_geometry_change(_viewport);
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}
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void ButtonImpl::_handle_font_color_change(Color fg, Color)
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{
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_caption.font_color_fg(fg);
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}
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void ButtonImpl::_handle_geometry_change(const SDL_Rect& vp)
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{
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const auto h = _caption.size().h + 2 * border_size.h;
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_widget_area = {0, center_line(vp.h, _caption.size().h) - border_size.h, vp.w, h};
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const auto txt_size = _caption.size();
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_caption_area = {center_line(vp.w, txt_size.w), center_line(vp.h, txt_size.h),
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txt_size.w, txt_size.h};
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_caption.viewport(rect_offset(_caption_area, vp));
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}
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void ButtonImpl::_handle_renderer_change(const std::shared_ptr<Renderer>& r)
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{
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_caption.renderer(r);
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}
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void ButtonImpl::_handle_rendering()
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{
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Color c = MouseHandlerImpl::hovered() ? color_bg_hover : color_bg;
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const auto divider = MouseHandlerImpl::pushed() ? 1.5 : 2;
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auto x = 0;
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auto y = 0;
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const auto biggest = border_size.w > border_size.h ? border_size.w : border_size.h;
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while (x < border_size.w || y < border_size.h) {
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const auto max = x > y ? x : y;
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const auto margin = Size({x, y});
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_renderer->draw_color(border_gradient(biggest, max, divider))
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->draw_rect(rect_margin(_widget_area, margin));
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if (x < border_size.w) x++;
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if (y < border_size.h) y++;
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}
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_renderer->draw_color(c)->fill_rect(rect_margin(_widget_area, border_size));
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_caption.font_color_bg(c);
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_caption.render();
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}
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void ButtonImpl::_on_push(bool state)
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{
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SDL_Point offset {_viewport.x, _viewport.y};
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if (state) {
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offset.x += 1;
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offset.y += 1;
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}
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_caption.viewport(rect_offset(_caption_area, offset));
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}
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