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ScrollBar.c

/* 
A* -------------------------------------------------------------------
B* This file contains source code for the PyMOL computer program
C* copyright 1998-2002 by Warren Lyford Delano of DeLano Scientific. 
D* -------------------------------------------------------------------
E* It is unlawful to modify or remove this copyright notice.
F* -------------------------------------------------------------------
G* Please see the accompanying LICENSE file for further information. 
H* -------------------------------------------------------------------
I* Additional authors of this source file include:
-* 
-* 
-*
Z* -------------------------------------------------------------------
*/
#include"os_gl.h"
#include"Base.h"
#include"Block.h"
#include"OOMac.h"
#include"Ortho.h"
#include"ScrollBar.h"

typedef struct CScrollBar {
  Block *Block;
  int HorV;
  float BackColor[3];
  float BarColor[3];
  int ListSize;
  int DisplaySize;
  int BarSize;
  int StartPos;
  float ExactBarSize;
  float Value;
  float StartValue;
  float ValueMax;
  int BarRange;
  int BarMin;
  int BarMax;
  int Grabbed;

} CScrollBar;

void ScrollBarMaxOut(struct CScrollBar *I)
{
  I->Value = I->ValueMax;
}

int ScrollBarIsMaxed(struct CScrollBar *I)
{
  if(I->ValueMax > 0.0F) {
    if(I->Value == I->ValueMax)
      return true;
    else
      return false;
  } else
    return false;
}

static void ScrollBarUpdate(struct CScrollBar *I)
{
  int range;

  if(I->HorV) {
    range = (I->Block->rect.right - I->Block->rect.left);
  } else {
    range = (I->Block->rect.top - I->Block->rect.bottom);
  }
  I->ExactBarSize = (range * I->DisplaySize) / (float) I->ListSize;
  I->BarSize = (int) (0.499F + I->ExactBarSize);
  if(I->BarSize < 4)
    I->BarSize = 4;
  I->BarRange = range - I->BarSize;
  if(I->BarRange < 2)
    I->BarRange = 2;
  I->ValueMax = (float) I->ListSize - I->DisplaySize;
  if(I->ValueMax < 1)
    I->ValueMax = 1;
  if(I->Value > I->ValueMax)
    I->Value = (float) I->ValueMax;
}

static void ScrollBarDraw(Block * block)
{
  PyMOLGlobals *G = block->G;
  float value;
  int top, left, bottom, right;

  CScrollBar *I = (CScrollBar *) block->reference;
  glColor3fv(I->BackColor);
  BlockFill(I->Block);

  ScrollBarUpdate(I);

  value = I->Value;
  if(value > I->ValueMax)
    value = I->ValueMax;

  if(I->HorV) {
    top = block->rect.top - 1;
    bottom = block->rect.bottom + 1;
    left = (int) (0.499F + block->rect.left + (I->BarRange * value) / I->ValueMax);
    right = left + I->BarSize;
    I->BarMin = left;
    I->BarMax = right;
  } else {
    top = (int) (0.499F + block->rect.top - (I->BarRange * value) / I->ValueMax);
    bottom = top - I->BarSize;
    left = block->rect.left + 1;
    right = block->rect.right - 1;
    I->BarMin = top;
    I->BarMax = bottom;
  }

  if(G->HaveGUI && G->ValidContext) {

    glColor3f(0.8F, 0.8F, 0.8F);
    glBegin(GL_POLYGON);
    glVertex2i(right, top);
    glVertex2i(right, bottom + 1);
    glVertex2i(left, bottom + 1);
    glVertex2i(left, top);
    glEnd();

    glColor3f(0.3F, 0.3F, 0.3F);
    glBegin(GL_POLYGON);
    glVertex2i(right, top - 1);
    glVertex2i(right, bottom);
    glVertex2i(left + 1, bottom);
    glVertex2i(left + 1, top - 1);
    glEnd();

    glColor3f(0.3F, 0.3F, 0.3F);
    glBegin(GL_POLYGON);
    glVertex2i(right, bottom + 1);
    glVertex2i(right, bottom);
    glVertex2i(left, bottom);
    glVertex2i(left, bottom + 1);
    glEnd();

    glColor3fv(I->BarColor);
    glBegin(GL_POLYGON);
    glVertex2i(right - 1, top - 1);
    glVertex2i(right - 1, bottom + 1);
    glVertex2i(left + 1, bottom + 1);
    glVertex2i(left + 1, top - 1);
    glEnd();
  }
}

void ScrollBarDrawHandle(struct CScrollBar *I, float alpha)
{
  float value;
  int top, left, bottom, right;
  Block *block = I->Block;
  PyMOLGlobals *G = block->G;

  value = I->Value;
  if(value > I->ValueMax)
    value = I->ValueMax;

  if(I->HorV) {
    top = block->rect.top - 1;
    bottom = block->rect.bottom + 1;
    left = (int) (0.499F + block->rect.left + (I->BarRange * value) / I->ValueMax);
    right = left + I->BarSize;
  } else {
    top = (int) (0.499F + block->rect.top - (I->BarRange * value) / I->ValueMax);
    bottom = top - I->BarSize;
    left = block->rect.left + 1;
    right = block->rect.right - 1;
  }

  if(G->HaveGUI && G->ValidContext) {

    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    glColor4f(0.8F, 0.8F, 0.8F, alpha);
    glBegin(GL_POLYGON);
    glVertex2i(right, top);
    glVertex2i(right, bottom + 1);
    glVertex2i(left, bottom + 1);
    glVertex2i(left, top);
    glEnd();

    glColor4f(0.3F, 0.3F, 0.3F, alpha);
    glBegin(GL_POLYGON);
    glVertex2i(right, top - 1);
    glVertex2i(right, bottom);
    glVertex2i(left + 1, bottom);
    glVertex2i(left + 1, top - 1);
    glEnd();

    glColor4f(0.3F, 0.3F, 0.3F, alpha);
    glBegin(GL_POLYGON);
    glVertex2i(right, bottom + 1);
    glVertex2i(right, bottom);
    glVertex2i(left, bottom);
    glVertex2i(left, bottom + 1);
    glEnd();

    glColor4f(I->BarColor[0], I->BarColor[1], I->BarColor[2], alpha);
    glBegin(GL_POLYGON);
    glVertex2i(right - 1, top - 1);
    glVertex2i(right - 1, bottom + 1);
    glVertex2i(left + 1, bottom + 1);
    glVertex2i(left + 1, top - 1);
    glEnd();

    glDisable(GL_BLEND);
  }
}

void ScrollBarSetValue(struct CScrollBar *I, float value)
{
  I->Value = value;
  ScrollBarUpdate(I);
}

float ScrollBarGetValue(struct CScrollBar *I)
{
  return (I->Value);
}

static void ScrollBarReshape(Block * block, int width, int height)
{
}

int ScrollBarGrabbed(struct CScrollBar *I)
{
  return OrthoGrabbedBy(I->Block->G, I->Block);
}

static int ScrollBarClick(Block * block, int button, int x, int y, int mod)
{
  PyMOLGlobals *G = block->G;
  CScrollBar *I = (CScrollBar *) block->reference;

  if(I->HorV) {
    if(x > I->BarMax) {
      switch (button) {
      case P_GLUT_MIDDLE_BUTTON:
        {
          I->Value = (I->ListSize * (x - block->rect.left)) /
            (block->rect.right - block->rect.left) - I->DisplaySize * 0.5F;
          if(I->Value > I->ValueMax)
            I->Value = I->ValueMax;
          OrthoGrab(G, I->Block);
          I->StartPos = x;
          I->StartValue = I->Value;
        }
        break;
      default:
        I->Value += I->DisplaySize;
        if(I->Value > I->ValueMax)
          I->Value = I->ValueMax;
      }

      OrthoDirty(G);
    } else if(x < I->BarMin) {
      switch (button) {
      case P_GLUT_MIDDLE_BUTTON:
        {
          I->Value = (I->ListSize * (x - block->rect.left)) /
            (block->rect.right - block->rect.left) - I->DisplaySize * 0.5F;
          if(I->Value < 0.0)
            I->Value = 0.0F;
          OrthoGrab(G, I->Block);
          I->StartPos = x;
          I->StartValue = I->Value;
        }
        break;
      default:
        I->Value -= I->DisplaySize;
        if(I->Value < 0.0)
          I->Value = 0.0F;
      }
      OrthoDirty(G);
    } else {
      OrthoGrab(G, I->Block);
      I->StartPos = x;
      I->StartValue = I->Value;
      OrthoDirty(G);
    }
  } else {
    if(y > I->BarMin) {
      switch (button) {
      case P_GLUT_MIDDLE_BUTTON:
        {
          I->Value = (I->ListSize * (y - block->rect.top)) /
            (block->rect.bottom - block->rect.top) - I->DisplaySize * 0.5F;
          if(I->Value < 0.0)
            I->Value = 0.0F;
          OrthoGrab(G, I->Block);
          I->StartPos = y;
          I->StartValue = I->Value;
        }
        break;
      default:
        I->Value -= I->DisplaySize;
        if(I->Value < 0.0)
          I->Value = 0.0F;
      }
      OrthoDirty(G);
    } else if(y < I->BarMax) {
      switch (button) {
      case P_GLUT_MIDDLE_BUTTON:
        {
          I->Value = (I->ListSize * (y - block->rect.top)) /
            (block->rect.bottom - block->rect.top) - I->DisplaySize * 0.5F;
          if(I->Value > I->ValueMax)
            I->Value = I->ValueMax;
          OrthoGrab(G, I->Block);
          I->StartPos = y;
          I->StartValue = I->Value;
        }
        break;
      default:
        I->Value += I->DisplaySize;
        if(I->Value > I->ValueMax)
          I->Value = I->ValueMax;
      }
      OrthoDirty(G);
    } else {
      OrthoGrab(G, I->Block);
      I->StartPos = y;
      I->StartValue = I->Value;
      OrthoDirty(G);
    }
  }
  return 0;
}

static int ScrollBarDrag(Block * block, int x, int y, int mod)
{
  PyMOLGlobals *G = block->G;
  CScrollBar *I = (CScrollBar *) block->reference;
  int displ;
  if(I->HorV)
    displ = I->StartPos - x;
  else
    displ = y - I->StartPos;
  I->Value = I->StartValue - (I->ValueMax * displ) / I->BarRange;
  /*  if(displ>0.0)
     I->Value-=0.5;
     else
     I->Value+=0.5;
   */

  if(I->Value < 0.0)
    I->Value = 0.0;
  if(I->Value > I->ValueMax)
    I->Value = I->ValueMax;
  OrthoDirty(G);
  return 0;
}

static int ScrollBarRelease(Block * block, int button, int x, int y, int mod)
{
  PyMOLGlobals *G = block->G;
  OrthoUngrab(G);
  OrthoDirty(G);
  return 0;
}

Block *ScrollBarGetBlock(struct CScrollBar * I)
{
  return (I->Block);
}

void ScrollBarSetLimits(struct CScrollBar *I, int list_size, int display_size)
{
  I->ListSize = list_size;
  I->DisplaySize = display_size;
  ScrollBarUpdate(I);
}

void ScrollBarSetBox(struct CScrollBar *I, int top, int left, int bottom, int right)
{
  I->Block->rect.top = top;
  I->Block->rect.left = left;
  I->Block->rect.bottom = bottom;
  I->Block->rect.right = right;
}

void ScrollBarDoDraw(struct CScrollBar *I)
{
  if(I->Block->fDraw)
    I->Block->fDraw(I->Block);
}

void ScrollBarDoRelease(struct CScrollBar *I, int button, int x, int y, int mod)
{
  if(I->Block->fRelease)
    I->Block->fRelease(I->Block, button, x, y, mod);
}

void ScrollBarDoDrag(struct CScrollBar *I, int x, int y, int mod)
{
  if(I->Block->fDrag)
    I->Block->fDrag(I->Block, x, y, mod);
}

void ScrollBarDoClick(struct CScrollBar *I, int button, int x, int y, int mod)
{
  if(I->Block->fClick)
    I->Block->fClick(I->Block, button, x, y, mod);
}

struct CScrollBar *ScrollBarNew(PyMOLGlobals * G, int horizontal)
{
  OOAlloc(G, CScrollBar)

    I->Block = OrthoNewBlock(G, NULL);
  I->Block->fRelease = ScrollBarRelease;
  I->Block->fClick = ScrollBarClick;
  I->Block->fDrag = ScrollBarDrag;
  I->Block->fDraw = ScrollBarDraw;
  I->Block->fReshape = ScrollBarReshape;
  I->Block->active = false;
  I->Block->reference = (void *) I;
  I->HorV = horizontal;
  I->BackColor[0] = 0.1F;
  I->BackColor[1] = 0.1F;
  I->BackColor[2] = 0.1F;
  I->BarColor[0] = 0.5F;
  I->BarColor[1] = 0.5F;
  I->BarColor[2] = 0.5F;
  I->ListSize = 10;
  I->DisplaySize = 7;
  I->Value = 0.0F;
  I->ValueMax = 0.0F;
  return (I);
}

void ScrollBarFree(struct CScrollBar *I)
{
  PyMOLGlobals *G = I->Block->G;
  OrthoFreeBlock(G, I->Block);
  OOFreeP(I);
}

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