library: libGui #include "TGCanvas.h"

# TGViewPort

class description - source file - inheritance tree (.pdf)

## class TGViewPort : public TGCompositeFrame

| Inheritance Chart:

`TObject`

<-

`TGObject`

<-

`TGWindow`

`TQObject`

<-

`TGFrame`

<-

`TGCompositeFrame`

<-

`TGViewPort`

        public:

                              TGViewPort(const TGWindow* p = 0, UInt_t w = 1, UInt_t h = 1, UInt_t options = kChildFrame, Pixel_t back = GetDefaultFrameBackground())
                              TGViewPort(const TGViewPort&)
                              ~TGViewPort()
               static TClass* Class()
                 virtual void DrawBorder()
                     TGFrame* GetContainer() const
          virtual TGDimension GetDefaultSize() const
                        Int_t GetHPos() const
                        Int_t GetVPos() const
               virtual Bool_t HandleConfigureNotify(Event_t* event)
              virtual TClass* IsA() const
                 virtual void Layout()
                         void SetContainer(TGFrame* f)
                 virtual void SetHPos(Int_t xpos)
                         void SetPos(Int_t xpos, Int_t ypos)
                 virtual void SetVPos(Int_t ypos)
                 virtual void ShowMembers(TMemberInspector& insp, char* parent)
                 virtual void Streamer(TBuffer& b)
                         void StreamerNVirtual(TBuffer& b)

### Data Members

        protected:

             Int_t fX0
             Int_t fY0         position of container frame in viewport
          TGFrame* fContainer  container frame

## Class Description

     TGCanvas and TGViewPort and TGContainer

     A TGCanvas is a frame containing two scrollbars (a horizontal and
     a vertical) and a viewport. The viewport acts as the window through
     which we look at the contents of the container frame.

     A TGContainer frame manages a content area. It can display and
     control a hierarchy of multi-column items, and provides the ability
     to add new items at any time. By default it doesn't map subwindows
     which are items of the container. In this case subwindow must
     provide DrawCopy method, see for example TGLVEntry class.
     It is also possible to use option which allow to map subwindows.
     This option has much slower drawing speed in case of more than 1000
     items placed in container. To activate this option the fMapSubwindows
     data member must be set to kTRUE (for example TTVLVContainer class)

       The TGContainer class can handle the keys:

        o  F7, Ctnrl-F - activate search dialog
        o  F3, Ctnrl-G - continue search
        o  End - go to the last item in container
        o  Home - go to the first item in container
        o  PageUp,PageDown,arrow keys - navigate inside container
        o  Return/Enter - equivalent to double click of the mouse button
        o  Contrl-A - select/activate all items.
        o  Space - invert selection.

TGViewPort(const TGWindow *p, UInt_t w, UInt_t h, UInt_t options, ULong_t back) : TGCompositeFrame(p, w, h, options, back)

     Create a viewport object.

void SetContainer(TGFrame *f)

     Add container frame to the viewport. We must make sure that the added
     container is at least a TGCompositeFrame (TGCanvas::AddFrame depends
     on it).

void SetHPos(Int_t xpos)

     Moves content of container frame in horizontal direction.

void SetVPos(Int_t ypos)

      moves content of container frame in vertical direction

void SetPos(Int_t xpos, Int_t ypos)

     goto new position

Bool_t HandleConfigureNotify(Event_t *event)

     handle resize events.

### Inline Functions

                   void ~TGViewPort()
               TGFrame* GetContainer() const
                   void DrawBorder()
                   void Layout()
            TGDimension GetDefaultSize() const
                  Int_t GetHPos() const
                  Int_t GetVPos() const
                TClass* Class()
                TClass* IsA() const
                   void ShowMembers(TMemberInspector& insp, char* parent)
                   void Streamer(TBuffer& b)
                   void StreamerNVirtual(TBuffer& b)
             TGViewPort TGViewPort(const TGViewPort&)

Author: Fons Rademakers 11/01/98
Last update: root/gui:$Name: $:$Id: TGCanvas.cxx,v 1.33 2005/01/20 15:37:28 rdm Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *