96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
/*
|
|
*********************************************************************************************************
|
|
* uC/GUI
|
|
* Universal graphic software for embedded applications
|
|
*
|
|
* (c) Copyright 2002, Micrium Inc., Weston, FL
|
|
* (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
|
|
*
|
|
* µC/GUI is protected by international copyright laws. Knowledge of the
|
|
* source code may not be used to write a similar product. This file may
|
|
* only be used in accordance with a license and should not be redistributed
|
|
* in any way. We appreciate your understanding and fairness.
|
|
*
|
|
----------------------------------------------------------------------
|
|
File : WM_SetScrollPos.c
|
|
Purpose : Windows manager, optional routines
|
|
----------------------------------------------------------------------
|
|
*/
|
|
|
|
#include "WM_Intern.h"
|
|
|
|
#if GUI_WINSUPPORT
|
|
|
|
/*********************************************************************
|
|
*
|
|
* Public code
|
|
*
|
|
**********************************************************************
|
|
*/
|
|
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* WM_CheckScrollBounds
|
|
*
|
|
*/
|
|
void WM_CheckScrollBounds(WM_SCROLL_STATE* pScrollState) {
|
|
int Max;
|
|
Max = pScrollState->NumItems - pScrollState->PageSize;
|
|
if (Max < 0) {
|
|
Max = 0;
|
|
}
|
|
/* Make sure scroll pos is in bounds */
|
|
if (pScrollState->v < 0) {
|
|
pScrollState->v = 0;
|
|
}
|
|
if (pScrollState->v > Max) {
|
|
pScrollState->v = Max;
|
|
}
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* WM_CheckScrollPos
|
|
*
|
|
* Return value: Difference between old an new Scroll value.
|
|
* Therefor 0 if settings have not changed.
|
|
*/
|
|
int WM_CheckScrollPos(WM_SCROLL_STATE* pScrollState, int Pos, int LowerDist, int UpperDist) {
|
|
int vOld;
|
|
vOld = pScrollState->v;
|
|
/* Check upper limit */
|
|
if (Pos > pScrollState->v + pScrollState->PageSize - 1) {
|
|
pScrollState->v = Pos - (pScrollState->PageSize - 1) + UpperDist;
|
|
}
|
|
/* Check lower limit */
|
|
if (Pos < pScrollState->v) {
|
|
pScrollState->v = Pos - LowerDist;
|
|
}
|
|
WM_CheckScrollBounds(pScrollState);
|
|
return pScrollState->v - vOld;
|
|
}
|
|
|
|
/*********************************************************************
|
|
*
|
|
* WM_SetScrollValue
|
|
*
|
|
* Return value: Difference between old an new Scroll value.
|
|
* Therefor 0 if settings have not changed.
|
|
*/
|
|
int WM_SetScrollValue(WM_SCROLL_STATE* pScrollState, int v) {
|
|
int vOld;
|
|
vOld = pScrollState->v;
|
|
pScrollState->v = v;
|
|
WM_CheckScrollBounds(pScrollState);
|
|
return pScrollState->v - vOld;
|
|
}
|
|
|
|
#else
|
|
void WM_CheckScrollPos_c(void) {} /* avoid empty object files */
|
|
#endif
|
|
|
|
/*************************** End of file ****************************/
|