|| || || || || || || ||

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VideoNav.h

Go to the documentation of this file.

#ifndef Impala_Visualization_VideoNav_h
#define Impala_Visualization_VideoNav_h

#include "Visualization/Window.h"
#include "Core/Stream/RgbDataSrc.h"
#include "Visualization/VideoNavListener.h"

namespace Impala {
namespace Visualization {

class VideoNav : public Window
{
public:
    typedef Core::Stream::RgbDataSrc RgbDataSrc;

    VideoNav(int x, int y, RgbDataSrc* src, double viewScale = 1.0,
             bool allowJump = true) :
        Window(x, y, viewScale * src->FrameWidth(),
               viewScale * src->FrameHeight() + 25, true)
    {
        Init(src, allowJump, viewScale);
    }

    VideoNav(OglGui::Window* parent, RgbDataSrc* src, double viewScale = 1.0,
             bool allowJump = true) :
        Window(parent, viewScale * src->FrameWidth() + 2,
               viewScale * src->FrameHeight() + 2 + 25, true)
    {
        Init(src, allowJump, viewScale);
    }

    VideoNav(OglGui::Window* parent, int frameWidth, int frameHeight,
             double viewScale = 1.0, bool allowJump = true) :
        Window(parent, viewScale * frameWidth + 2,
               viewScale * frameHeight + 2 + 25, true)
    {
        Init(0, allowJump, viewScale);
    }

    void SetVideoNavListener(VideoNavListener* listener, void* listenerData = 0)
    {
        mVideoNavListener = listener;
        mListenerData = listenerData;
    }

    void SetRect(Core::Geometry::Rectangle rect)
    {
        ViewWithRect* view = GetViewWithRect(0);
        if (view)
            view->SetRect(rect);
    }

    Core::Geometry::Rectangle
    GetRect()
    {
        return GetViewWithRect(0)->GetRect();
    }

    void ToggleHashValueDisplay()
    {
        mDisplayFrameHash = !mDisplayFrameHash;
    }

    void ChangeSrc(RgbDataSrc* src)
    {
        mSrc = src;
        if (!mSrc)
        {
            DeleteViewers();
            return;
        }
        if ((mLastFrameWidth != mSrc->FrameWidth()) ||
            (mLastFrameHeight != mSrc->FrameHeight()))
        {
            int border = (GetParent()) ? 2 : 0;
            int newWidth = mViewScale * mSrc->FrameWidth() + border;
            int newHeight = mViewScale * mSrc->FrameHeight() + border + 25;
            int dy = newHeight - WndHeight();
            SetDimensions(RETAIN, WndY() - dy, newWidth, newHeight);
            DeleteViewers();
            mLastFrameWidth = mSrc->FrameWidth();
            mLastFrameHeight = mSrc->FrameHeight();
        }
    }

    // specialization of base classes

    virtual void KeyboardFunc(int c, int state)
    {
        if (c=='#') // hash sign
            ToggleHashValueDisplay();
        Window::KeyboardFunc(c,state);
    }

    virtual void DisplayFunc()
    {
        Window::DisplayFunc();

        if (!mSrc)
            return;

        OGC oldOGC;
        OGCSave(&oldOGC);

        SetSolidLineColor(oglBLACK);
        SetLineWidth(1);
        // on screen, the "interior span" of a Rectangle is width-1
        // also, the upper right corner pixel is not drawn
        int width = mOglWnd->width;
        DrawRectangle(0, 0, width-1, 25 - 2); // 2 is to separate
        if (mDisplayFrameHash)
        {
            if (mSrc->FrameNr() != mLastFrame)
                mLastHash = mSrc->GetHash();
            String msg = "hash: [" + mLastHash + "]";
            oglSys.PosColPrintf(mOglWnd, 4, 27, oglGREEN, "%s",msg.c_str());
        }
        oglSys.PosColPrintf(mOglWnd, 20, 7, oglGREEN, "at frame %d of %d",
                            mSrc->FrameNr(), mSrc->LastFrame());
        SetSolidLineColor(oglRED);
        mMappedFramePos = ((double)mSrc->FrameNr()/mSrc->LastFrame())*(width-3);
        DrawRectangle(1 + mMappedFramePos, 1, 1, 25 - 4);

        OGCRestore(&oldOGC);
    }

    virtual void MouseFunc(int msg, int but, int state, int x, int y)
    {
        Window::MouseFunc(msg, but, state, x, y);

        if (msg == oglMouseUp)
            mScrollDrag = false;

        if (((msg==oglMouseDown && but==oglLeftButton) || 
            (msg==oglMouseMove && state&oglLeftButton)) && y < 25)
        {
            if ((msg==oglMouseDown) && (but==oglLeftButton))
                mScrollDrag = true;
            if (x < 0)
                x = 0;
            int width = mOglWnd->width-1;
            if (x >= width)
                x = width;
            int reqFr = ((double) x / width) * mSrc->LastFrame();
            if (reqFr >= mSrc->LastFrame() - 1)
                reqFr = mSrc->LastFrame() - 1;
            if ((reqFr != mSrc->FrameNr()) && mVideoNavListener &&
                mScrollDrag && mAllowJump)
            {
                mVideoNavListener->NavFrameEvent(this, reqFr, mListenerData);
            }
        }
    }

private:

    void Init(RgbDataSrc* src, bool allowJump, double viewScale)
    {
        mSrc = src;
        mLastFrameWidth = (src) ? src->FrameWidth() : -1;
        mLastFrameHeight = (src) ? src->FrameHeight() : -1;
        mAllowJump = allowJump;
        mViewScale = viewScale;
        if (mSrc && (mSrc->LastFrame() > 1000000)) // navigation not supported
            mAllowJump = false;
        mRequestedFrame = 0;
        mMappedFramePos = 0;
        mScrollDrag = false;
        mVideoNavListener = 0;
        SetMakeViewWithRect(true);

        mLastFrame = -1;
        mLastHash = "";
        mDisplayFrameHash = true;
    }

    RgbDataSrc*         mSrc;
    int                 mLastFrameWidth;
    int                 mLastFrameHeight;
    bool                mAllowJump;
    double              mViewScale;
    int                 mRequestedFrame;
    int                 mMappedFramePos;
    bool                mScrollDrag;

    int                 mLastFrame;
    String              mLastHash;
    bool                mDisplayFrameHash;

    VideoNavListener*   mVideoNavListener;
    void*               mListenerData;

};

} // namespace Visualization
} // namespace Impala

#endif

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