Leaked source code of windows server 2003
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/*-----------------------------------------------------------------------------+
| TRACK.C |
| |
| Contains the code which implements the track bar |
| |
| (C) Copyright Microsoft Corporation 1991. All rights reserved. |
| |
| Revision History |
| Oct-1992 MikeTri Ported to WIN32 / WIN16 common code |
| |
+-----------------------------------------------------------------------------*/
#include <windows.h>
#include <mmsystem.h>
#include <windowsx.h>
#include "mplayer.h"
#include "toolbar.h"
#include "tracki.h"
WNDPROC fnTrackbarWndProc = NULL;
/* TB_OnKey
*
* Handles WM_KEYDOWN and WM_KEYUP messages.
*
* If the shift key is pressed while we're playing or scrolling
* treat it as a start selection. End the selection on the key-up
* message.
*
* Clear any selection if the escape key is pressed.
*
*/
void TB_OnKey(HWND hwnd, UINT vk, BOOL fDown, int cRepeat, UINT flags)
{
int cmd = -1;
switch(vk)
{
case VK_SHIFT:
/* Check that the key wasn't already down:
*/
if (fDown && !(flags & 0x4000))
{
if(((gwStatus == MCI_MODE_PLAY) || gfScrollTrack)
&&(toolbarStateFromButton(ghwndMark, BTN_MARKIN, TBINDEX_MARK)
!= BTNST_GRAYED))
SendMessage(hwnd, WM_COMMAND, IDT_MARKIN, 0);
}
/* If !fDown, it must be fUp:
*/
else if (!fDown)
{
if (SendMessage(ghwndTrackbar, TBM_GETSELSTART, 0, 0) != -1)
SendMessage(hwnd, WM_COMMAND, IDT_MARKOUT, 0);
}
break;
case VK_ESCAPE:
SendMessage(ghwndTrackbar, TBM_CLEARSEL, (WPARAM)TRUE, 0);
break;
default:
if (fDown)
{
// Don't do this, because the common-control trackbar sends us
// WM_HSCROLL in response to this, which causes us to increment twice:
// FORWARD_WM_KEYDOWN(hwnd, vk, cRepeat, flags, fnTrackbarWndProc);
switch (vk)
{
case VK_HOME:
cmd = TB_TOP;
break;
case VK_END:
cmd = TB_BOTTOM;
break;
case VK_PRIOR:
cmd = TB_PAGEUP;
break;
case VK_NEXT:
cmd = TB_PAGEDOWN;
break;
case VK_LEFT:
case VK_UP:
cmd = TB_LINEUP;
break;
case VK_RIGHT:
case VK_DOWN:
cmd = TB_LINEDOWN;
break;
default:
break;
}
}
else
{
FORWARD_WM_KEYUP(hwnd, vk, cRepeat, flags, fnTrackbarWndProc);
return;
}
if (cmd != -1)
SendMessage(GetParent(hwnd), WM_HSCROLL, MAKELONG(cmd, 0), (LPARAM)hwnd);
}
}
/* Subclass the window so that we can handle the key presses
* we're interested in.
*/
/* TBWndProc() */
LONG_PTR FAR PASCAL
SubClassedTrackbarWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
HANDLE_MSG(hwnd, WM_KEYDOWN, TB_OnKey);
HANDLE_MSG(hwnd, WM_KEYUP, TB_OnKey);
/* HACK ALERT
*
* This is to get around a bug in the Chicago common control trackbar,
* which is sending too many TB_ENDTRACK notifications.
* It sends one when it receives WM_CAPTURECHANGED, even if it called
* ReleaseCapture itself.
* So, if we're not currently scrolling, ignore it.
*/
case WM_CAPTURECHANGED:
if (!gfScrollTrack)
return 0;
case TBM_SHOWTICS:
/* If we're hiding the ticks, we want a chiseled thumb,
* so make it TBS_BOTH as well as TBS_NOTICKS.
*/
if (wParam == TRUE)
SetWindowLongPtr(hwnd, GWL_STYLE,
(GetWindowLongPtr(hwnd, GWL_STYLE) & ~(TBS_NOTICKS | TBS_BOTH)));
else
SetWindowLongPtr(hwnd, GWL_STYLE,
(GetWindowLongPtr(hwnd, GWL_STYLE) | TBS_NOTICKS | TBS_BOTH));
if (lParam == TRUE)
InvalidateRect(hwnd, NULL, TRUE);
return 0;
}
return CallWindowProc(fnTrackbarWndProc, hwnd, message, wParam, lParam);
}
void SubClassTrackbarWindow()
{
if (!fnTrackbarWndProc)
fnTrackbarWndProc = (WNDPROC)GetWindowLongPtr(ghwndTrackbar, GWLP_WNDPROC);
if (ghwndTrackbar)
SetWindowLongPtr(ghwndTrackbar, GWLP_WNDPROC, (LONG_PTR)SubClassedTrackbarWndProc);
}