window_controls_win32_widget.hpp

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// Copyright Take Vos 2020-2021.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "widget.hpp"
#include "../font/font.hpp"
#include "../macros.hpp"
#include <memory>
#include <string>
#include <array>
 
hi_export_module(hikogui.widgets.window_controls_win32_widget);
 
hi_export namespace hi { inline namespace v1 {
 
class window_controls_win32_widget : public widget {
public:
    using super = widget;
 
    window_controls_win32_widget(not_null<widget_intf const *> parent) noexcept : super(parent) {}
 
    [[nodiscard]] box_constraints update_constraints() noexcept override
    {
        _layout = {};
 
        auto const size = extent2{theme().large_size() * 3.0f, theme().large_size()};
        return {size, size, size};
    }
 
    void set_layout(widget_layout const& context) noexcept override
    {
        if (compare_store(_layout, context)) {
            auto extent = context.size();
            if (extent.height() > floor_cast<int>(theme().large_size() * 1.2f)) {
                extent = extent2{extent.width(), theme().large_size()};
            }
            auto y = context.height() - extent.height();
 
            closeRectangle =
                aarectangle{point2(extent.width() * 2.0f / 3.0f, y), extent2{extent.width() * 1.0f / 3.0f, extent.height()}};
 
            maximizeRectangle =
                aarectangle{point2(extent.width() * 1.0f / 3.0f, y), extent2{extent.width() * 1.0f / 3.0f, extent.height()}};
 
            minimizeRectangle = aarectangle{point2(0.0f, y), extent2{extent.width() * 1.0f / 3.0f, extent.height()}};
 
            closeWindowGlyph = find_glyph(hikogui_icon::CloseWindow);
            minimizeWindowGlyph = find_glyph(hikogui_icon::MinimizeWindow);
            maximizeWindowGlyph = find_glyph(hikogui_icon::MaximizeWindowMS);
            restoreWindowGlyph = find_glyph(hikogui_icon::RestoreWindowMS);
            auto const glyph_size = theme().icon_size();
 
            auto const closeWindowGlyphBB = closeWindowGlyph.get_metrics().bounding_rectangle * glyph_size;
            auto const minimizeWindowGlyphBB = minimizeWindowGlyph.get_metrics().bounding_rectangle * glyph_size;
            auto const maximizeWindowGlyphBB = maximizeWindowGlyph.get_metrics().bounding_rectangle * glyph_size;
            auto const restoreWindowGlyphBB = restoreWindowGlyph.get_metrics().bounding_rectangle * glyph_size;
 
            closeWindowGlyphRectangle = align(closeRectangle, closeWindowGlyphBB, alignment::middle_center());
            minimizeWindowGlyphRectangle = align(minimizeRectangle, minimizeWindowGlyphBB, alignment::middle_center());
            maximizeWindowGlyphRectangle = align(maximizeRectangle, maximizeWindowGlyphBB, alignment::middle_center());
            restoreWindowGlyphRectangle = align(maximizeRectangle, restoreWindowGlyphBB, alignment::middle_center());
        }
    }
 
    void draw(draw_context const& context) noexcept override
    {
        if (mode() > widget_mode::invisible and overlaps(context, layout())) {
            if (pressedClose) {
                context.draw_box(layout(), closeRectangle, color{1.0f, 0.0f, 0.0f});
            } else if (hoverClose) {
                context.draw_box(layout(), closeRectangle, color{0.5f, 0.0f, 0.0f});
            } else {
                context.draw_box(layout(), closeRectangle, theme().color(semantic_color::fill, _layout.layer));
            }
 
            if (pressedMinimize) {
                context.draw_box(layout(), minimizeRectangle, theme().color(semantic_color::fill, _layout.layer + 2));
            } else if (hoverMinimize) {
                context.draw_box(layout(), minimizeRectangle, theme().color(semantic_color::fill, _layout.layer + 1));
            } else {
                context.draw_box(layout(), minimizeRectangle, theme().color(semantic_color::fill, _layout.layer));
            }
 
            if (pressedMaximize) {
                context.draw_box(layout(), maximizeRectangle, theme().color(semantic_color::fill, _layout.layer + 2));
            } else if (hoverMaximize) {
                context.draw_box(layout(), maximizeRectangle, theme().color(semantic_color::fill, _layout.layer + 1));
            } else {
                context.draw_box(layout(), maximizeRectangle, theme().color(semantic_color::fill, _layout.layer));
            }
 
            auto const glyph_color = phase() >= widget_phase::normal ? label_color() : foreground_color();
 
            context.draw_glyph(layout(), translate_z(0.1f) * closeWindowGlyphRectangle, closeWindowGlyph, glyph_color);
            context.draw_glyph(layout(), translate_z(0.1f) * minimizeWindowGlyphRectangle, minimizeWindowGlyph, glyph_color);
            if (layout().window_size_state == gui_window_size::maximized) {
                context.draw_glyph(layout(), translate_z(0.1f) * restoreWindowGlyphRectangle, restoreWindowGlyph, glyph_color);
            } else {
                context.draw_glyph(layout(), translate_z(0.1f) * maximizeWindowGlyphRectangle, maximizeWindowGlyph, glyph_color);
            }
        }
    }
 
    bool handle_event(gui_event const& event) noexcept override
    {
        switch (event.type()) {
        case gui_event_type::mouse_move:
        case gui_event_type::mouse_drag:
            {
                // Check the hover states of each button.
                auto state_has_changed = false;
                state_has_changed |= compare_store(hoverClose, closeRectangle.contains(event.mouse().position));
                state_has_changed |= compare_store(hoverMinimize, minimizeRectangle.contains(event.mouse().position));
                state_has_changed |= compare_store(hoverMaximize, maximizeRectangle.contains(event.mouse().position));
                if (state_has_changed) {
                    request_redraw();
                }
            }
            break;
 
        case gui_event_type::mouse_exit:
            hoverClose = false;
            hoverMinimize = false;
            hoverMaximize = false;
            request_redraw();
            return super::handle_event(event);
 
        case gui_event_type::mouse_down:
            if (event.mouse().cause.left_button) {
                if (closeRectangle.contains(event.mouse().position)) {
                    pressedClose = true;
 
                } else if (minimizeRectangle.contains(event.mouse().position)) {
                    pressedMinimize = true;
 
                } else if (maximizeRectangle.contains(event.mouse().position)) {
                    pressedMaximize = true;
                }
                request_redraw();
                return true;
            }
            break;
 
        case gui_event_type::mouse_up:
            if (event.mouse().cause.left_button) {
                pressedClose = false;
                pressedMinimize = false;
                pressedMaximize = false;
                request_redraw();
 
                if (closeRectangle.contains(event.mouse().position)) {
                    return process_event({gui_event_type::window_close});
 
                } else if (minimizeRectangle.contains(event.mouse().position)) {
                    return process_event({gui_event_type::window_minimize});
 
                } else if (maximizeRectangle.contains(event.mouse().position)) {
                    switch (layout().window_size_state) {
                    case gui_window_size::normal:
                        return process_event({gui_event_type::window_maximize});
 
                    case gui_window_size::maximized:
                        return process_event({gui_event_type::window_normalize});
 
                    default:
                        hi_no_default();
                    }
                }
                return true;
            }
            break;
 
        default:;
        }
        return super::handle_event(event);
    }
 
    [[nodiscard]] hitbox hitbox_test(point2 position) const noexcept override
    {
        hi_axiom(loop::main().on_thread());
 
        if (mode() >= widget_mode::partial and layout().contains(position) and
            (closeRectangle.contains(position) or minimizeRectangle.contains(position) or maximizeRectangle.contains(position))) {
            return hitbox{id, _layout.elevation, hitbox_type::button};
        } else {
            return {};
        }
    }
private:
    aarectangle closeRectangle;
    aarectangle minimizeRectangle;
    aarectangle maximizeRectangle;
 
    font_book::font_glyph_type closeWindowGlyph;
    font_book::font_glyph_type minimizeWindowGlyph;
    font_book::font_glyph_type maximizeWindowGlyph;
    font_book::font_glyph_type restoreWindowGlyph;
 
    aarectangle closeWindowGlyphRectangle;
    aarectangle minimizeWindowGlyphRectangle;
    aarectangle maximizeWindowGlyphRectangle;
    aarectangle restoreWindowGlyphRectangle;
 
    bool hoverClose = false;
    bool hoverMinimize = false;
    bool hoverMaximize = false;
 
    bool pressedClose = false;
    bool pressedMinimize = false;
    bool pressedMaximize = false;
};
 
}} // namespace hi::v1