TGCanvas


class description - source file - inheritance tree

class TGCanvas : public TGFrame


    public:
TGCanvas TGCanvas(const TGWindow* p, UInt_t w, UInt_t h, UInt_t options = kSunkenFrame|kDoubleBorder, ULong_t back = GetDefaultFrameBackground()) TGCanvas TGCanvas(const TGCanvas&) virtual void ~TGCanvas() virtual void AddFrame(TGFrame* f, TGLayoutHints* l = 0) static TClass* Class() virtual void DrawBorder() TGFrame* GetContainer() const virtual TGDimension GetDefaultSize() const virtual Int_t GetHsbPosition() const TGHScrollBar* GetHScrollbar() const Int_t GetScrolling() const TGViewPort* GetViewPort() const virtual Int_t GetVsbPosition() const TGVScrollBar* GetVScrollbar() const virtual TClass* IsA() const virtual void Layout() virtual void MapSubwindows() virtual Bool_t ProcessMessage(Long_t msg, Long_t parm1, Long_t parm2) virtual void SetContainer(TGFrame* f) virtual void SetHsbPosition(Int_t newPos) void SetScrolling(Int_t scrolling) virtual void SetVsbPosition(Int_t newPos) virtual void ShowMembers(TMemberInspector& insp, char* parent) virtual void Streamer(TBuffer& b) void StreamerNVirtual(TBuffer& b)

Data Members


    protected:
TGViewPort* fVport viewport through which we look at contents TGHScrollBar* fHScrollbar horizontal scrollbar TGVScrollBar* fVScrollbar vertical scrollbar Int_t fScrolling flag which srolling modes are allowed public:
static const enum TObject:: kCanvasNoScroll static const enum TObject:: kCanvasScrollHorizontal static const enum TObject:: kCanvasScrollVertical static const enum TObject:: kCanvasScrollBoth


See also

TGListView, TRootEmbeddedCanvas

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 itmes 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.                                      
                                                                      


TGCanvas(const TGWindow *p, UInt_t w, UInt_t h, UInt_t options, ULong_t back) : TGFrame(p, w, h, options, back)
 Create a canvas object.

~TGCanvas()
 Delete canvas.

void MapSubwindows()
 Map all canvas sub windows.

void AddFrame(TGFrame *f, TGLayoutHints *l)
 Adding a frame to a canvas is actually adding the frame to the
 viewport container. The viewport container must be at least a
 TGCompositeFrame for this method to succeed.

void DrawBorder()
 Draw canvas border.

void Layout()
 Create layout for canvas. Depending on the size of the container
 we need to add the scrollbars.

Bool_t ProcessMessage(Long_t msg, Long_t parm1, Long_t)
 Handle message generated by the canvas scrollbars.

Int_t GetHsbPosition() const
 Get position of horizontal scrollbar.

Int_t GetVsbPosition() const
 Get position of vertical scrollbar.

void SetHsbPosition(Int_t newPos)
 Set position of horizontal scrollbar.

void SetVsbPosition(Int_t newPos)
 Set position of vertical scrollbar.

void SetScrolling(Int_t scrolling)
 Set scrolling policy. Use values defined by the enum: kCanvasNoScroll,
 kCanvasScrollHorizontal, kCanvasScrollVertical, kCanvasScrollBoth.



Inline Functions


             TGFrame* GetContainer() const
          TGViewPort* GetViewPort() const
        TGHScrollBar* GetHScrollbar() const
        TGVScrollBar* GetVScrollbar() const
                 void SetContainer(TGFrame* f)
                Int_t GetScrolling() const
          TGDimension GetDefaultSize() const
              TClass* Class()
              TClass* IsA() const
                 void ShowMembers(TMemberInspector& insp, char* parent)
                 void Streamer(TBuffer& b)
                 void StreamerNVirtual(TBuffer& b)
             TGCanvas TGCanvas(const TGCanvas&)


Author: Fons Rademakers 11/01/98
Last update: root/gui:$Name: $:$Id: TGCanvas.cxx,v 1.15 2002/11/19 23:37:49 rdm Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *


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