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riched20: Keep track of fractions of WHEEL_DELTA when scrolling.

This commit is contained in:
Huw Davies 2014-03-31 14:09:42 +01:00 committed by Alexandre Julliard
parent 2f07df59f9
commit fa50baf31f
2 changed files with 30 additions and 9 deletions
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38
dlls/riched20/editor.c
View File

@ -2858,6 +2858,8 @@ ME_TextEditor *ME_MakeEditor(ITextHost *texthost, BOOL bEmulateVersion10)
ed->horz_si.nPage = 0;
ed->horz_si.nPos = 0;
ed->wheel_remain = 0;
OleInitialize(NULL);
return ed;
@ -2936,6 +2938,13 @@ static inline int get_default_line_height( ME_TextEditor *editor )
return height;
}
static inline int calc_wheel_change( int *remain, int amount_per_click )
{
int change = amount_per_click * (float)*remain / WHEEL_DELTA;
*remain -= WHEEL_DELTA * change / amount_per_click;
return change;
}
static const char * const edit_messages[] = {
"EM_GETSEL",
"EM_SETSEL",
@ -4145,6 +4154,7 @@ LRESULT ME_HandleMessage(ME_TextEditor *editor, UINT msg, WPARAM wParam,
case WM_KILLFOCUS:
ME_CommitUndo(editor); /* End coalesced undos for typed characters */
editor->bHaveFocus = FALSE;
editor->wheel_remain = 0;
ME_HideCaret(editor);
ME_SendOldNotify(editor, EN_KILLFOCUS);
return 0;
@ -4273,8 +4283,7 @@ LRESULT ME_HandleMessage(ME_TextEditor *editor, UINT msg, WPARAM wParam,
}
case WM_MOUSEWHEEL:
{
int gcWheelDelta;
UINT pulScrollLines;
int delta;
BOOL ctrl_is_down;
if ((editor->nEventMask & ENM_MOUSEEVENTS) &&
@ -4283,9 +4292,16 @@ LRESULT ME_HandleMessage(ME_TextEditor *editor, UINT msg, WPARAM wParam,
ctrl_is_down = GetKeyState(VK_CONTROL) & 0x8000;
gcWheelDelta = GET_WHEEL_DELTA_WPARAM(wParam);
delta = GET_WHEEL_DELTA_WPARAM(wParam);
if (abs(gcWheelDelta) >= WHEEL_DELTA)
/* if scrolling changes direction, ignore left overs */
if ((delta < 0 && editor->wheel_remain < 0) ||
(delta > 0 && editor->wheel_remain > 0))
editor->wheel_remain += delta;
else
editor->wheel_remain = delta;
if (editor->wheel_remain)
{
if (ctrl_is_down) {
int numerator;
@ -4295,14 +4311,18 @@ LRESULT ME_HandleMessage(ME_TextEditor *editor, UINT msg, WPARAM wParam,
} else {
numerator = editor->nZoomNumerator * 100 / editor->nZoomDenominator;
}
numerator = numerator + (gcWheelDelta / WHEEL_DELTA) * 10;
numerator += calc_wheel_change( &editor->wheel_remain, 10 );
if (numerator >= 10 && numerator <= 500)
ME_SetZoom(editor, numerator, 100);
} else {
SystemParametersInfoW(SPI_GETWHEELSCROLLLINES,0, &pulScrollLines, 0);
/* FIXME follow the original */
if (pulScrollLines)
ME_ScrollDown(editor,pulScrollLines * (-gcWheelDelta / WHEEL_DELTA) * 8);
UINT max_lines = 3;
int lines = 0;
SystemParametersInfoW( SPI_GETWHEELSCROLLLINES, 0, &max_lines, 0 );
if (max_lines)
lines = calc_wheel_change( &editor->wheel_remain, (int)max_lines );
if (lines)
ME_ScrollDown( editor, -lines * get_default_line_height( editor ) );
}
}
break;

1
dlls/riched20/editstr.h
View File

@ -443,6 +443,7 @@ typedef struct tagME_TextEditor
SCROLLINFO vert_si, horz_si;
BOOL bMouseCaptured;
int wheel_remain;
} ME_TextEditor;
typedef struct tagME_Context