inventorypopup.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef NANCY_UI_INVENTORYPOPUP_H
#define NANCY_UI_INVENTORYPOPUP_H

#include "engines/nancy/renderobject.h"

namespace Nancy {

struct NancyInput;
struct INV;
struct UIIV;

namespace State {
class Scene;
}

namespace UI {

// Nancy 10+ inventory popup (replaces the always-visible InventoryBox of
// pre-Nancy-10 games). Driven by the UIIV chunk (popup graphics + slot
// rects + filter buttons) and the INV chunk (per-item descriptions/icons).
class InventoryPopup : public RenderObject {
public:
    InventoryPopup();
    ~InventoryPopup() override = default;

    void init() override;
    void handleInput(NancyInput &input);

    bool isOpen() const { return _isVisible; }
    void open();
    void close();

    // The taskbar's inventory button toggles the popup; convenience helper.
    void toggle() { if (_isVisible) close(); else open(); }

    // Re-render the slot grid. Called by Scene whenever the inventory
    // contents change while the popup is open.
    void refreshGrid();

    enum FilterType {
        kFilterAll       = 0,
        kFilterViewable  = 1,
        kFilterPortable  = 2,
    };

    enum WidgetState {
        kStatePressed = 0,
        kStateHover = 1,
        kStateIdle = 2,
        kStateDisabled = 3
    };

private:
    static const uint kSlotsPerPage = 16;
    static const uint kNumFilters = 3;

    void drawBackground();
    void drawSlot(uint slotIndex, int16 itemId);
    void drawFilterTabs();
    void drawFilterTab(uint index, bool drawHover = false);
    void drawFilterCaption();
    void drawCloseButton(WidgetState state);
    void drawScrollbar(WidgetState state);
    void rebuildVisibleList();
    void setActiveFilterIndex(uint index);

    // Apply the current scrollbar position to the page index, clamping
    // to the number of pages required by the active filter.
    void updatePageFromScroll();

    // Returns the on-popup-surface bounding rect of the slider thumb at
    // the current scroll position (in popup-local coords).
    Common::Rect computeSliderRect() const;

    const UIIV *_uiivData = nullptr;
    const INV *_invData = nullptr;

    Graphics::ManagedSurface _overlayImage;     // popup background image
    Graphics::ManagedSurface _itemIcons;        // per-item icon sheet

    bool _closeButtonHovered = false;

    uint _activeFilterIndex = 0;

    // Page index within the active filter (0-based).
    uint _currentPage = 0;

    // Items the player owns that match the active filter, in inventory
    // order. The on-screen grid is a 16-item window into this array.
    Common::Array<int16> _visibleItems;

    // Item ID currently shown in each of the 16 slots (-1 if empty).
    int16 _slotItemIDs[kSlotsPerPage];

    // Slider state. Driven by header.slider.
    float _scrollPos = 0.0f;        // [0, 1]: 0 = top page, 1 = bottom page
    bool _scrollbarDragging = false;
    bool _scrollbarHovered = false;
    int _scrollbarGrabOffset = 0;   // mouse-y minus thumb-top at click time

    bool _filterHovered = false;
};

} // End of namespace UI
} // End of namespace Nancy

#endif // NANCY_UI_INVENTORYPOPUP_H