taskbar.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_TASKBAR_H
#define NANCY_UI_TASKBAR_H

#include "engines/nancy/renderobject.h"

namespace Nancy {

struct NancyInput;

namespace UI {

// Always-on bottom-of-screen strip introduced in Nancy 10.
// Holds 5 buttons (MENU / inventory / notebook / cellphone / HELP) that
// open the various popup UIs handled by Scene.
class Taskbar : public RenderObject {
public:
    Taskbar();
    virtual ~Taskbar() = default;

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

    // Enable / disable a taskbar button. A disabled button is rendered
    // in its disabled sprite and ignores clicks.
    void toggleButton(uint index, bool enabled);

    // Disable override: keep the disabled sprite active while the current
    // scene is in [startScene, endScene]. Driven by AR 29 (ControlUIItems,
    // _flagB != 0).
    void setDisabledRange(uint buttonIndex, int16 startScene, int16 endScene);
    void clearButtonOverride(uint buttonIndex);

    // Notification badge: each button has up to 3 independent notification
    // sub-categories. The badge shows when any sub-category is set; it
    // persists across scene changes until cleared (or all sub-cats are
    // cleared individually). Disabled state takes precedence over the badge.
    void setNotification(uint buttonIndex, uint subCategory);
    void clearNotification(uint buttonIndex, uint subCategory);
    void clearAllNotifications(uint buttonIndex);

    // Re-evaluate which buttons should currently show their override
    // sprite. Call after a scene change so the range check kicks in.
    void updateNotificationStates(int16 currentSceneID);

    // Returns the index of the button that was clicked this frame, or -1
    // if none. Cleared on the next call to handleInput().
    int getClickedButton() const { return _clickedButton; }

private:
    enum ButtonState {
        kButtonIdle         = 0,
        kButtonHover        = 1,
        kButtonPressed      = 2,
        kButtonDisabled     = 3,   // not clickable
        kButtonNotification = 4    // popup has new content (badge sprite)
    };

    // A scene-ranged disable override for one button. While active and the
    // current scene is within [startScene, endScene] the button renders in
    // the disabled state.
    struct ButtonOverride {
        bool active = false;
        int16 startScene = -1;
        int16 endScene = -1;
    };

    static const uint kNumNotificationSubCategories = 3;

    void drawButton(uint index, ButtonState state);
    ButtonState restingState(uint index) const;
    // True when the button currently accepts hover/click (not disabled).
    bool isButtonActive(uint index) const;

    Graphics::ManagedSurface _backgroundImage; // TASK::imageName (e.g. "Frame")
    Graphics::ManagedSurface _buttonImage;     // buttons' primaryImageName (e.g. "UIShared_OVL")
    int _hoveredButton;
    int _clickedButton;
    int16 _currentScene;
    bool _enabled[5];
    ButtonState _buttonStates[5];
    ButtonOverride _overrides[5];
    bool _notifications[5][kNumNotificationSubCategories];
};

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

#endif // NANCY_UI_TASKBAR_H