Widget.h

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// -                        Open3D: www.open3d.org                            -
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// The MIT License (MIT)
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// Copyright (c) 2018 www.open3d.org
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#pragma once

#include <memory>
#include <vector>

#include "Open3D/GUI/Gui.h"

namespace open3d {
namespace gui {

class Color;
struct MouseEvent;
struct KeyEvent;
struct TickEvent;
struct Theme;

struct DrawContext {
    const Theme& theme;
    int uiOffsetX;
    int uiOffsetY;
    int screenWidth;
    int screenHeight;
    int emPx;
    float frameDelta;  // in seconds
};

class Widget {
    friend class Window;

public:
    Widget();
    explicit Widget(const std::vector<std::shared_ptr<Widget>>& children);
    virtual ~Widget();

    void AddChild(std::shared_ptr<Widget> child);
    const std::vector<std::shared_ptr<Widget>> GetChildren() const;

    const Rect& GetFrame() const;
    virtual void SetFrame(const Rect& f);

    const Color& GetBackgroundColor() const;
    bool IsDefaultBackgroundColor() const;
    void SetBackgroundColor(const Color& color);

    bool IsVisible() const;
    virtual void SetVisible(bool vis);

    bool IsEnabled() const;
    virtual void SetEnabled(bool enabled);

    static constexpr int DIM_GROW = 10000;
    virtual Size CalcPreferredSize(const Theme& theme) const;

    virtual void Layout(const Theme& theme);

    enum class DrawResult { NONE, REDRAW, RELAYOUT };
    virtual DrawResult Draw(const DrawContext& context);

    enum class EventResult { IGNORED, CONSUMED, DISCARD };

    virtual EventResult Mouse(const MouseEvent& e);

    virtual EventResult Key(const KeyEvent& e);

    virtual DrawResult Tick(const TickEvent& e);

protected:
    void DrawImGuiPushEnabledState();
    void DrawImGuiPopEnabledState();

private:
    struct Impl;
    std::unique_ptr<Impl> impl_;
};

}  // namespace gui
}  // namespace open3d