events.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 ULTIMA0_EVENTS_H
#define ULTIMA0_EVENTS_H

#include "common/array.h"
#include "common/stack.h"
#include "graphics/screen.h"
#include "ultima/ultima0/messages.h"
#include "ultima/ultima0/gfx/gfx_surface.h"

namespace Ultima {
namespace Ultima0 {

#define FRAME_RATE 20
#define FRAME_DELAY (1000 / FRAME_RATE)

class Events;

struct Bounds {
private:
    Common::Rect _bounds;
    Common::Rect &_innerBounds;
    int _borderSize = 0;
public:
    const int16 &left;
    const int16 &top;
    const int16 &right;
    const int16 &bottom;
public:
    Bounds(Common::Rect &innerBounds);
    operator const Common::Rect &() const {
        return _bounds;
    }
    Bounds &operator=(const Common::Rect &r);
    void setBorderSize(size_t borderSize);
    size_t borderSize() const {
        return _borderSize;
    }
    int16 width() const {
        return _bounds.width();
    }
    int16 height() const {
        return _bounds.height();
    }
};

class UIElement {
    friend class Events;
private:
    int _timeoutCtr = 0;
protected:
    UIElement *_parent;
    Common::Array<UIElement *> _children;
    Common::Rect _innerBounds;
    Bounds _bounds;
    bool _needsRedraw = true;
    Common::String _name;
protected:
    void delaySeconds(uint seconds);

    void delayFrames(uint frames);

    bool isDelayActive() const {
        return _timeoutCtr != 0;
    }

    void cancelDelay() {
        _timeoutCtr = 0;
    }

    virtual void timeout();

private:
    void drawElements();

    static UIElement *findViewGlobally(const Common::String &name);
public:
    UIElement(const Common::String &name, UIElement *uiParent);
    UIElement(const Common::String &name);
    virtual ~UIElement() {
    }

    bool needsRedraw() const {
        return _needsRedraw;
    }

    void redraw();

    void focus();

    virtual void close();

    /*
     * Returns true if the view is focused
     */
    bool isFocused() const;

    Common::String getName() const {
        return _name;
    }

    void replaceView(UIElement *ui, bool replaceAllViews = false);
    void replaceView(const Common::String &name, bool replaceAllViews = false);

    void addView(UIElement *ui);
    void addView(const Common::String &name);
    void addView();
    void open() {
        addView();
    }

    int getRandomNumber(int minNumber, int maxNumber);
    int getRandomNumber(int maxNumber);

    virtual void setBounds(const Common::Rect &r) {
        _bounds = r;
    }

    Common::Rect getBounds() const {
        return _bounds;
    }

    Gfx::GfxSurface getSurface() const;

    virtual void clearSurface();

    virtual void draw();

    virtual bool tick();

    virtual UIElement *findView(const Common::String &name);

     // Mouse move only has a minimal implementation for performance reasons
protected:
    virtual bool msgMouseMove(const MouseMoveMessage &msg) {
        return false;
    }
public:
    bool send(const MouseMoveMessage &msg) {
        return msgMouseMove(msg);
    }

#define MESSAGE(NAME) \
    protected: \
        virtual bool msg##NAME(const NAME##Message &e) { \
            for (Common::Array<UIElement *>::iterator it = _children.begin(); \
                    it != _children.end(); ++it) { \
                if ((*it)->msg##NAME(e)) return true; \
            } \
            return false; \
        } \
    public: \
        bool send(const Common::String &viewName, const NAME##Message &msg) { \
            UIElement *view = UIElement::findViewGlobally(viewName); \
            assert(view); \
            return view->msg##NAME(msg); \
        } \
        bool send(const NAME##Message &msg) { \
            return msg##NAME(msg); \
        } \

    MESSAGE(Focus);
    MESSAGE(Unfocus);
    MESSAGE(MouseEnter);
    MESSAGE(MouseLeave);
    MESSAGE(Keypress);
    MESSAGE(MouseDown);
    MESSAGE(MouseUp);
    MESSAGE(Action);
    MESSAGE(Game);
    MESSAGE(Value);
#undef MESSAGE
};

class Events : public UIElement {
private:
    Graphics::Screen *_screen = nullptr;
    Common::Stack<UIElement *> _views;
protected:
    void processEvent(Common::Event &ev);

    virtual bool shouldQuit() const = 0;

#define MESSAGE(NAME) \
        bool msg##NAME(const NAME##Message &e) override { \
            return !_views.empty() ? focusedView()->msg##NAME(e) : false; \
        }
    MESSAGE(Action);
    MESSAGE(Focus);
    MESSAGE(Unfocus);
    MESSAGE(MouseEnter);
    MESSAGE(MouseLeave);
    MESSAGE(Keypress);
    MESSAGE(MouseDown);
    MESSAGE(MouseUp);
    MESSAGE(MouseMove);
#undef MESSAGE
public:
    Events();
    virtual ~Events();

    void runGame();

    void replaceView(UIElement *ui, bool replaceAllViews = false);
    void replaceView(const Common::String &name, bool replaceAllViews = false);

    void addView(UIElement *ui);
    void addView(const Common::String &name);

    void clearViews();

    void popView();

    void redrawViews();

    UIElement *focusedView() const {
        return _views.empty() ? nullptr : _views.top();
    }

    UIElement *priorView() const {
        return _views.size() < 2 ? nullptr :
            _views[_views.size() - 2];
    }

    bool isPresent(const Common::String &name) const;

    bool isInCombat() const {
        return isPresent("Combat");
    }

    Graphics::Screen *getScreen() const {
        return _screen;
    }

    void drawElements() {
        if (!_views.empty())
            focusedView()->drawElements();
    }

    void addKeypress(const Common::KeyCode kc);

    void draw() override {
    }

    bool tick() override {
        return !_views.empty() ? focusedView()->tick() : false;
    }

    void close() override {
        focusedView()->close();
    }
};

extern Events *g_events;

} // namespace Ultima0
} // namespace Ultima

#endif