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Cocoa: add LM_MOUSEWHEEL default implement in TCocoaWidgetSet.CallDefaultWndHandler()

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the default implementation is to convert LM_MOUSEWHEEL/LM_MOUSEHWHEEL events into LM_VSCROLL/LM_HSCROLL events
This commit is contained in:
rich2014 2024-05-13 23:28:20 +08:00
parent dca0f86606
commit 1ec049f943
1 changed files with 54 additions and 1 deletions
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55
lcl/interfaces/cocoa/cocoawinapi.inc
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@ -129,6 +129,56 @@ const
WantTab : array [boolean] of integer = (0, DLGC_WANTTAB);
WantArrow : array [boolean] of integer = (0, DLGC_WANTARROWS);
WantKeys : array [boolean] of integer = (0, DLGC_WANTALLKEYS);
procedure CallMouseWheelHandler(barFlag: Integer);
var
scrollMsg: TLMScroll;
pMsg: PLMessage;
winControl: TWinControl Absolute Sender;
scrollControl: TScrollingWinControl Absolute Sender;
barControl: TControlScrollBar;
barInfo: TScrollInfo;
wheelDelta: Integer;
pos: Integer;
offset: Integer;
inc: Integer;
begin
if NOT GetScrollInfo(winControl.Handle, barFlag, barInfo{%H-}) then
Exit;
if winControl is TScrollingWinControl then
begin
if barFlag = SB_Vert then
barControl:= scrollControl.VertScrollBar
else
barControl:= scrollControl.HorzScrollBar;
inc:= barControl.Increment;
end
else
inc:= Mouse.WheelScrollLines;
wheelDelta := TLMMouseEvent(Message).WheelDelta;
offset:= WheelDelta * inc div 120;
if barFlag = SB_Vert then
offset:= -offset;
pos:= barInfo.nPos + offset;
if pos > barInfo.nMax then
pos:= barInfo.nMax;
if pos < barInfo.nMin then
pos:= barInfo.nMin;
FillChar(scrollMsg{%H-}, SizeOf(TLMScroll), #0);
if barFlag = SB_Vert then
scrollMsg.Msg := LM_VSCROLL
else
scrollMsg.Msg := LM_HSCROLL;
scrollMsg.Pos := pos;
scrollMsg.ScrollCode := SB_THUMBPOSITION;
pMsg:= @scrollMsg;
winControl.WindowProc( pMsg^ );
end;
begin
case TLMessage(Message).Msg of
LM_GETDLGCODE: begin
@ -146,8 +196,11 @@ begin
ks := ks or rt; // Return is handled by LCL as part of ALLKey
TLMessage(Message).Result := TLMessage(Message).Result or WantTab[tb] or WantArrow[ar] or WantKeys[ks];
end;
end;
LM_MOUSEWHEEL:
CallMouseWheelHandler(SB_Vert);
LM_MOUSEHWHEEL:
CallMouseWheelHandler(SB_Horz);
else
TLMessage(Message).Result := 0;
end;