103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
#include <cmath>
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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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#include <basic_widgets/w/widget_factory.hpp>
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using namespace bwidgets;
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ButtonImpl::ButtonImpl(Widget* parent) noexcept
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: WidgetImpl {parent}, _caption {create_caption(this)}
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{
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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](const int len, const int pos,
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const float divider) -> Color {
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const auto& end_color = hovered() ? color_bg_hover : color_bg;
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return lerp(end_color / divider, end_color, linear(pos, 0, len));
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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 -> std::string_view
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{
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return _caption->text();
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}
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void ButtonImpl::text(std::string txt)
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{
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_caption->text(std::move(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(const 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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const Color& c = hovered() ? color_bg_hover : color_bg;
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const auto divider = pushed() ? 1.5F : 2.F;
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auto x = 0;
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auto y = 0;
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const auto biggest_dimension =
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border_size.w > border_size.h ? border_size.w : border_size.h;
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const auto& max_xy = border_size.w > border_size.h ? x : y;
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// Render button borders.
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while (x < border_size.w || y < border_size.h) {
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_renderer->draw_color(border_gradient(biggest_dimension, max_xy, divider))
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->draw_rect(rect_margin(_widget_area, {x, y}));
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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(const bool state)
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{
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// Move slightly the caption position to give a push effect.
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const auto offset = [state, this]() -> SDL_Point {
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if (state) {
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return {_viewport.x + 1, _viewport.y + 1};
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}
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return {_viewport.x, _viewport.y};
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}();
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_caption->viewport(rect_offset(_caption_area, offset));
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}
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