WindowTheme.h

/*
 * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/Forward.h>
#include <LibGfx/Forward.h>
#include <LibGfx/StylePainter.h>

namespace Gfx {

class WindowTheme {
public:
    enum class WindowMode {
        RenderAbove,
        Other,
    };

    enum class WindowType {
        Normal,
        Notification,
        Other,
    };

    enum class WindowState {
        Active,
        Inactive,
        Highlighted,
        Moving,
    };

    virtual ~WindowTheme() = default;

    virtual void paint_normal_frame(Painter&, WindowState, WindowMode, IntRect const& window_rect, StringView title, Bitmap const& icon, Palette const&, IntRect const& leftmost_button_rect, int menu_row_count, bool window_modified) const = 0;
    virtual void paint_notification_frame(Painter&, WindowMode, IntRect const& window_rect, Palette const&, IntRect const& close_button_rect) const = 0;

    virtual int titlebar_height(WindowType, WindowMode, Palette const&) const = 0;
    virtual IntRect titlebar_rect(WindowType, WindowMode, IntRect const& window_rect, Palette const&) const = 0;
    virtual IntRect titlebar_icon_rect(WindowType, WindowMode, IntRect const& window_rect, Palette const&) const = 0;
    virtual IntRect titlebar_text_rect(WindowType, WindowMode, IntRect const& window_rect, Palette const&) const = 0;

    virtual IntRect menubar_rect(WindowType, WindowMode, IntRect const& window_rect, Palette const&, int menu_row_count) const = 0;

    virtual IntRect frame_rect_for_window(WindowType, WindowMode, IntRect const& window_rect, Palette const&, int menu_row_count) const = 0;

    virtual Vector<IntRect> layout_buttons(WindowType, WindowMode, IntRect const& window_rect, Palette const&, size_t buttons, bool is_maximized = false) const = 0;
    virtual bool is_simple_rect_frame() const = 0;
    virtual bool frame_uses_alpha(WindowState, Palette const&) const = 0;
    virtual bool taskbar_uses_alpha() const = 0;
    virtual float frame_alpha_hit_threshold(WindowState) const = 0;

    virtual void paint_taskbar(Painter&, IntRect const& taskbar_rect, Palette const&) const = 0;
    virtual void paint_button(Painter&, IntRect const&, Palette const&, ButtonStyle, bool pressed, bool hovered = false, bool checked = false, bool enabled = true, bool focused = false, bool default_button = false) const = 0;

protected:
    WindowTheme() = default;
};

}