grid.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 GUI_WIDGETS_GRID_H
#define GUI_WIDGETS_GRID_H

#include "gui/dialog.h"
#include "gui/widgets/scrollbar.h"
#include "common/str.h"

#include "image/bmp.h"
#include "image/png.h"
#include "graphics/svg.h"

namespace GUI {

class ScrollBarWidget;
class GridItemWidget;
class GridWidget;
class FluidScroller;

enum {
    kPlayButtonCmd = 'PLAY',
    kEditButtonCmd = 'EDIT',
    kLoadButtonCmd = 'LOAD',
    kOpenTrayCmd = 'OPTR',
    kItemClicked = 'LBX1',
    kItemDoubleClickedCmd = 'LBX2',
    kItemSizeCmd = 'SIZE'
};

/* GridItemInfo */
struct GridItemInfo {
    bool        isHeader, validEntry;
    int         entryID;
    Common::String      engineid;
    Common::String      gameid;
    Common::String      title;
    Common::String      description;
    Common::String      extra;
    Common::String      thumbPath;
    // Generic attribute value, may be any piece of metadata
    Common::String      attribute;
    Common::Language    language;
    Common::Platform    platform;
    bool                    canLoadGame;

    int32               x, y, w, h;

    GridItemInfo(int id, const Common::String &eid, const Common::String &gid, const Common::String &t,
        const Common::String &d, const Common::String &e, Common::Language l, Common::Platform p, bool v, bool cl)
        : entryID(id), gameid(gid), engineid(eid), title(t), description(d), extra(e), language(l), platform(p), validEntry(v), canLoadGame(cl), isHeader(false) {
        thumbPath = Common::String::format("icons/%s-%s.png", engineid.c_str(), gameid.c_str());
    }

    GridItemInfo(const Common::String &groupHeader, int groupID) : title(groupHeader), description(groupHeader),
        isHeader(true), validEntry(true), entryID(groupID), language(Common::UNK_LANG), platform(Common::kPlatformUnknown) {
        thumbPath = Common::String("");
    }
};

/* GridItemTray */
class GridItemTray: public Dialog, public CommandSender {
    int             _entryID;
    GridWidget      *_grid;
    GuiObject       *_boss;
    PicButtonWidget *_playButton;
    PicButtonWidget *_loadButton;
    PicButtonWidget *_editButton;

    bool _mouseOutside;
public:
    GridItemTray(GuiObject *boss, int x, int y, int w, int h, int entryID, GridWidget *grid);
    void enableLoadButton(bool canLoad) { _loadButton->setEnabled(canLoad); }

    void reflowLayout() override;

    void receivedFocus(int x = -1, int y = -1) override;
    void handleCommand(CommandSender *sender, uint32 cmd, uint32 data) override;
    void handleMouseDown(int x, int y, int button, int clickCount) override;
    void handleMouseUp(int x, int y, int button, int clickCount) override;
    void handleMouseWheel(int x, int y, int direction) override;
    void handleMouseMoved(int x, int y, int button) override;
};


/* GridWidget */
class GridWidget : public ContainerWidget, public CommandSender {
    friend class GridItemWidget;
public:
    typedef bool (*FilterMatcher)(void *arg, int idx, const Common::U32String &item, const Common::U32String &token);

protected:
    Common::HashMap<int, Common::SharedPtr<Graphics::ManagedSurface> > _platformIcons;
    Common::HashMap<int, Common::SharedPtr<Graphics::ManagedSurface> > _languageIcons;
    Common::HashMap<int, Common::SharedPtr<Graphics::ManagedSurface> > _extraIcons;
    Common::HashMap<int, Graphics::AlphaType> _platformIconsAlpha;
    Common::HashMap<int, Graphics::AlphaType> _languageIconsAlpha;
    Common::HashMap<int, Graphics::AlphaType> _extraIconsAlpha;
    Common::SharedPtr<Graphics::ManagedSurface> _disabledIconOverlay;
    // Images are mapped by filename -> surface.
    Common::HashMap<Common::String, Common::SharedPtr<Graphics::ManagedSurface> > _loadedSurfaces;

    Common::Array<GridItemInfo>         _dataEntryList;
    Common::Array<GridItemInfo>         _headerEntryList;
    Common::Array<GridItemInfo *>       _sortedEntryList;
    Common::Array<GridItemInfo *>       _visibleEntryList;

    Common::String                          _groupingAttribute;
    Common::HashMap<Common::U32String, int> _groupValueIndex;
    Common::Array<bool>                     _groupExpanded;
    Common::U32String                       _groupHeaderPrefix;
    Common::U32String                       _groupHeaderSuffix;
    Common::Array<Common::U32String>        _groupHeaders;
    Common::StringMap                           _metadataNames;
    Common::HashMap<int, Common::Array<int> >   _itemsInGroup;

    Common::Array<GridItemWidget *>     _gridItems;

    ScrollBarWidget *_scrollBar;

    int             _scrollBarWidth;
    int             _scrollWindowHeight;
    int             _scrollWindowWidth;
    int             _scrollSpeed;
    float           _scrollPos;
    int             _innerHeight;
    int             _innerWidth;
    int             _thumbnailHeight;
    int             _thumbnailWidth;
    int             _flagIconHeight;
    int             _flagIconWidth;
    int             _platformIconHeight;
    int             _platformIconWidth;
    int             _extraIconHeight;
    int             _extraIconWidth;
    int             _minGridXSpacing;
    int             _minGridYSpacing;
    int             _rows;
    int             _itemsPerRow;
    int             _firstVisibleItem;
    int             _lastVisibleItem;
    bool            _isGridInvalid;

    int             _scrollWindowPaddingX;
    int             _scrollWindowPaddingY;
    int             _gridHeaderHeight;
    int             _gridHeaderWidth;
    int             _trayHeight;

    bool            _multiSelectEnabled;    

    FilterMatcher _filterMatcher;
    void *_filterMatcherArg;

    // Drag to scroll
    bool _isMouseDown;
    bool _isDragging;
    bool _selectionPending;
    int _dragStartY, _dragLastY;
    uint32 _mouseDownTime;
    static const int kDragThreshold = 5;

    FluidScroller *_fluidScroller;
    GridItemWidget *_highlightedItem = nullptr;

public:
    int             _gridItemHeight;
    int             _gridItemWidth;
    int             _gridXSpacing;
    int             _gridYSpacing;
    int             _thumbnailMargin;

    bool            _isTitlesVisible;

    GridItemInfo    *_selectedEntry;

    Common::U32String   _filter;

    GridWidget(GuiObject *boss, const Common::String &name);
    ~GridWidget();

    Common::SharedPtr<Graphics::ManagedSurface> filenameToSurface(const Common::String &name);
    Common::SharedPtr<Graphics::ManagedSurface> languageToSurface(Common::Language languageCode, Graphics::AlphaType &alphaType);
    Common::SharedPtr<Graphics::ManagedSurface> platformToSurface(Common::Platform platformCode, Graphics::AlphaType &alphaType);
    Common::SharedPtr<Graphics::ManagedSurface> demoToSurface(const Common::String &extraString, Graphics::AlphaType &alphaType);
    Common::SharedPtr<Graphics::ManagedSurface> disabledThumbnail();

    bool calcVisibleEntries();
    void setEntryList(Common::Array<GridItemInfo> *list);
    void setAttributeValues(const Common::Array<Common::U32String> &attrs);
    void setMetadataNames(const Common::StringMap &metadata);
    void setTitlesVisible(bool vis);
    void markGridAsInvalid() { _isGridInvalid = true; }
    void setGroupHeaderFormat(const Common::U32String &prefix, const Common::U32String &suffix);

    void groupEntries();
    void sortGroups();
    bool groupExpanded(int groupID) { return _groupExpanded[groupID]; }
    void toggleGroup(int groupID);
    void loadClosedGroups(const Common::U32String &groupName);
    void saveClosedGroups(const Common::U32String &groupName);

    void reloadThumbnails();
    void loadFlagIcons();
    void loadPlatformIcons();
    void loadExtraIcons();

    void destroyItems();
    void calcInnerHeight();
    void calcEntrySizes();
    void updateGrid();
    void move(int x, int y);
    void scrollToEntry(int id, bool forceToTop);
    void assignEntriesToItems();

    int getItemPos(int item);
    int getNewSel(int index);
    int getVisualPos(int entryID) const;
    void selectVisualRange(int startPos, int endPos);
    float getScrollPos() const { return _scrollPos; }
    int getSelected() const { return ((_selectedEntry == nullptr) ? -1 : _selectedEntry->entryID); }
    int getThumbnailHeight() const { return _thumbnailHeight; }
    int getThumbnailWidth() const { return _thumbnailWidth; }

    void handleMouseWheel(int x, int y, int direction) override;
    void handleMouseDown(int x, int y, int button, int clickCount) override;
    void handleMouseUp(int x, int y, int button, int clickCount) override;
    void handleMouseMoved(int x, int y, int button) override;
    void handleTickle() override;
    void applyScrollPos(); // Updates the grid's visual elements to match current scroll position
    void handleCommand(CommandSender *sender, uint32 cmd, uint32 data) override;
    void reflowLayout() override;

    bool wantsFocus() override { return true; }

    void lostFocusWidget() override;
    bool handleKeyDown(Common::KeyState state) override;
    bool handleKeyUp(Common::KeyState state) override;
    void openTrayAtSelected();
    void scrollBarRecalc();

    void setSelected(int id);
    void setFilter(const Common::U32String &filter);
    void setFilterMatcher(FilterMatcher matcher, void *arg) { _filterMatcher = matcher; _filterMatcherArg = arg; }

    // Multi-selection methods
    void setMultiSelectEnabled(bool enabled) { _multiSelectEnabled = enabled; }
    bool isMultiSelectEnabled() const { return _multiSelectEnabled; }
    Common::Array<bool> _selectedItems; 
    int _lastSelectedEntryID = -1;      
    bool isItemSelected(int entryID) const;
    void markSelectedItem(int entryID, bool state);
    void clearSelection();
    const Common::Array<bool> &getSelectedItems() const { return _selectedItems; }
};

/* GridItemWidget */
class GridItemWidget : public ContainerWidget, public CommandSender {
protected:
    Common::SharedPtr<Graphics::ManagedSurface> _thumbGfx;
    Graphics::AlphaType _thumbAlpha;

    GridItemInfo    *_activeEntry;
    GridWidget      *_grid;
    bool            _isHighlighted;

public:
    GridItemWidget(GridWidget *boss);

    void move(int x, int y);
    void update();
    void updateThumb();
    void setActiveEntry(GridItemInfo &entry);

    void drawWidget() override;

    void handleMouseWheel(int x, int y, int direction) override;
    void handleMouseEntered(int button) override;
    void handleMouseLeft(int button) override;
    void handleMouseDown(int x, int y, int button, int clickCount) override;
    void handleMouseUp(int x, int y, int button, int clickCount) override;
    void handleMouseMoved(int x, int y, int button) override;
    void doSelection();
};

} // End of namespace GUI

#endif