include/root/TGPack.h

0001 // @(#)root/eve:$Id$
0002 // Author: Matevz Tadel 2007
0003
0004 /*************************************************************************
0005  * Copyright (C) 1995-2021, Rene Brun and Fons Rademakers.               *
0006  * All rights reserved.                                                  *
0007  *                                                                       *
0008  * For the licensing terms see $ROOTSYS/LICENSE.                         *
0009  * For the list of contributors see $ROOTSYS/README/CREDITS.             *
0010  *************************************************************************/
0011
0012 #ifndef ROOT_TGPack
0013 #define ROOT_TGPack
0014
0015 #include "TGFrame.h"
0016 #include "TGLayout.h"
0017
0018 class TGSplitter;
0019
0020
0021 class  TGFrameElementPack : public TGFrameElement
0022 {
0023 private:
0024    TGFrameElementPack(const TGFrameElementPack&) = delete;
0025    TGFrameElementPack& operator=(const TGFrameElementPack&) = delete;
0026
0027 public:
0028    Float_t fWeight;              ///< relative weight
0029    TGFrameElementPack* fSplitFE; ///<! cached variable for optimisation
0030
0031    TGFrameElementPack(TGFrame *frame, TGLayoutHints* lh = nullptr, Float_t weight = 1):
0032       TGFrameElement(frame, lh), fWeight(weight), fSplitFE(nullptr) { }
0033
0034    ClassDefOverride(TGFrameElementPack, 0); // Class used in TGPack.
0035 };
0036
0037 //==============================================================================
0038
0039 class TGPack : public TGCompositeFrame
0040 {
0041 private:
0042    TGPack(const TGPack&) = delete;
0043    TGPack& operator=(const TGPack&) = delete;
0044
0045 protected:
0046    Bool_t         fVertical;
0047    Bool_t         fUseSplitters;
0048    Int_t          fSplitterLen;
0049
0050    Int_t          fDragOverflow;  ///<!
0051
0052    Float_t        fWeightSum;     ///< total sum of sub  frame weights
0053    Int_t          fNVisible;      ///<  number of visible frames
0054
0055    Int_t          GetFrameLength(const TGFrame* f) const { return fVertical ? f->GetHeight() : f->GetWidth(); }
0056    Int_t          GetLength()                      const { return GetFrameLength(this); }
0057    Int_t          GetAvailableLength()             const;
0058
0059    void           SetFrameLength  (TGFrame* f, Int_t len);
0060    void           SetFramePosition(TGFrame* f, Int_t pos);
0061
0062    void           FindFrames(TGFrame* splitter, TGFrameElementPack*& f0, TGFrameElementPack*& f1) const;
0063
0064    void           CheckSplitterVisibility();
0065    void           ResizeExistingFrames();
0066    void           RefitFramesToPack();
0067
0068    void           AddFrameInternal(TGFrame *f, TGLayoutHints* l = nullptr, Float_t weight = 1);
0069    void           RemoveFrameInternal(TGFrame *f);
0070
0071 public:
0072    TGPack(const TGWindow *p = nullptr, UInt_t w = 1, UInt_t h = 1, UInt_t options = 0,
0073           Pixel_t back = GetDefaultFrameBackground());
0074    TGPack(TGClient *c, Window_t id, const TGWindow *parent = nullptr);
0075    ~TGPack() override;
0076
0077    virtual void AddFrameWithWeight(TGFrame *f, TGLayoutHints* l, Float_t w);
0078    void AddFrame(TGFrame *f, TGLayoutHints* l = nullptr) override;
0079
0080    virtual void DeleteFrame(TGFrame *f);
0081    void RemoveFrame(TGFrame *f) override;
0082    void ShowFrame(TGFrame *f) override;
0083    void HideFrame(TGFrame *f) override;
0084
0085    using TGCompositeFrame::Resize;
0086    void Resize(UInt_t w = 0, UInt_t h = 0) override;
0087
0088    using TGCompositeFrame::MapSubwindows;
0089    void MapSubwindows() override;
0090
0091    void MoveResize(Int_t x, Int_t y, UInt_t w = 0, UInt_t h = 0) override;
0092    void Layout() override;
0093
0094    void Dump() const override;
0095
0096    void EqualizeFrames();
0097    void HandleSplitterStart();
0098    void HandleSplitterResize(Int_t delta);
0099
0100    // ----------------------------------------------------------------
0101
0102    Bool_t GetVertical() const { return fVertical; }
0103    void   SetVertical(Bool_t x);
0104
0105    // For now assume this is always true. Length of splitter = 4 pixels.
0106    Bool_t GetUseSplitters() const { return fUseSplitters; }
0107    void SetUseSplitters(Bool_t x) { fUseSplitters = x; }
0108
0109    ClassDefOverride(TGPack, 0); // Horizontal or vertical stack of frames.
0110 };
0111
0112 #endif