reactos/base/applications/clipbrd/scrollutils.h

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/*
* PROJECT: ReactOS Clipboard Viewer
* LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
* PURPOSE: Scrolling related helper functions.
* COPYRIGHT: Copyright 2015-2018 Ricardo Hanke
* Copyright 2015-2018 Hermes Belusca-Maito
*/
#pragma once
typedef struct _SCROLLSTATE
{
UINT uLinesToScroll; /* Number of lines to scroll on one wheel rotation movement (== one "click" == WHEEL_DELTA ticks) */
INT iWheelCarryoverX; /* Unused wheel ticks (< WHEEL_DELTA) */
INT iWheelCarryoverY;
INT nPageX; /* Number of lines per page */
INT nPageY;
INT CurrentX; /* Current scrollbar position */
INT CurrentY;
INT MaxX; /* Maximum scrollbar position */
INT MaxY;
INT nMaxWidth; /* Maximum span of displayed data */
INT nMaxHeight;
} SCROLLSTATE, *LPSCROLLSTATE;
void OnKeyScroll(HWND hWnd, WPARAM wParam, LPARAM lParam, LPSCROLLSTATE state);
void OnMouseScroll(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LPSCROLLSTATE state);
void OnScroll(HWND hWnd, INT nBar, WPARAM wParam, INT iDelta, LPSCROLLSTATE state);
void UpdateLinesToScroll(LPSCROLLSTATE state);
void UpdateWindowScrollState(HWND hWnd, INT nMaxWidth, INT nMaxHeight, LPSCROLLSTATE lpState);