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lazarus/lcl/interfaces/win32/win32callback.inc

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{%MainUnit win32int.pp}
{
*****************************************************************************
* *
* This file is part of the Lazarus Component Library (LCL) *
* *
* See the file COPYING.modifiedLGPL, included in this distribution, *
* for details about the copyright. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
* *
*****************************************************************************
}
{$IFOPT C-}
// Uncomment for local trace
// {$C+}
// {$DEFINE ASSERT_IS_ON}
{$ENDIF}
{*************************************************************}
{ callback routines }
{*************************************************************}
procedure PrepareSynchronize;
begin
TWin32WidgetSet(WidgetSet).HandleWakeMainThread(nil);
end;
{ addition XP messages }
const
WM_THEMECHANGED = $31A;
{-----------------------------------------------------------------------------
Function: PropEnumProc
Params: Window - The window with the property
Str - The property name
Data - The property value
Returns: Whether the enumeration should continue
Enumerates and removes properties for the target window
-----------------------------------------------------------------------------}
Function PropEnumProc(Window: Hwnd; Str: PChar; Data: Handle): LongBool; StdCall;
Begin
Result:=false;
if PtrUInt(Str) <= $FFFF then exit; // global atom handle
Assert(False, 'Trace:PropEnumProc - Start');
Assert(False, Format('Trace:PropEnumProc - Property %S (with value 0x%X) from window 0x%X removed',
[String(Str), Data, Window]));
RemoveProp(Window, Str);
Result := True;
Assert(False, 'Trace:PropEnumProc - Exit');
End;
{------------------------------------------------------------------------------
Function: CallDefaultWindowProc
Params: Window - The window that receives a message
Msg - The message received
WParam - Word parameter
LParam - Long-integer parameter
Returns: 0 if Msg is handled; non-zero long-integer result otherwise
Passes message on to 'default' handler. This can be a control specific window
procedure or the default window procedure.
------------------------------------------------------------------------------}
function CallDefaultWindowProc(Window: HWnd; Msg: UInt; WParam: Windows.WParam;
LParam: Windows.LParam): LResult;
var
PrevWndProc: Windows.WNDPROC;
{$ifdef MSG_DEBUG}
depthLen: integer;
{$endif}
setComboWindow: boolean;
begin
{$ifdef MSG_DEBUG}
depthLen := Length(MessageStackDepth);
if depthLen > 0 then
MessageStackDepth[depthLen] := '#';
{$endif}
PrevWndProc := GetWindowInfo(Window)^.DefWndProc;
if PrevWndProc = nil then
Result := Windows.DefWindowProc(Window, Msg, WParam, LParam)
else begin
// combobox child edit weirdness: combobox handling WM_SIZE will compare text
// to list of strings, and if appears in there, will set the text, and select it
// WM_GETTEXTLENGTH, WM_GETTEXT, WM_SETTEXT, EM_SETSEL
// combobox sends WM_SIZE to itself indirectly, check recursion
setComboWindow := (Msg = WM_SIZE) and (ComboBoxHandleSizeWindow = 0)
and GetWindowInfo(Windows.GetTopWindow(Window))^.isComboEdit;
if setComboWindow then
ComboBoxHandleSizeWindow := Window;
Result := Windows.CallWindowProc(PrevWndProc, Window, Msg, WParam, LParam);
if setComboWindow then
ComboBoxHandleSizeWindow := 0;
end;
{$ifdef MSG_DEBUG}
if depthLen > 0 then
MessageStackDepth[depthLen] := ' ';
{$endif}
end;
type
TEraseBkgndCommand = (ecDefault, ecDiscard, ecDiscardNoRemove);
const
EraseBkgndStackMask = $3;
EraseBkgndStackShift = 2;
var
EraseBkgndStack: dword = 0;
{$ifdef MSG_DEBUG}
function EraseBkgndStackToString: string;
var
I: dword;
begin
SetLength(Result, 8);
for I := 0 to 7 do
Result[8-I] := char(ord('0') + ((EraseBkgndStack shr (I*2)) and $3));
end;
{$endif}
procedure PushEraseBkgndCommand(Command: TEraseBkgndCommand);
begin
{$ifdef MSG_DEBUG}
case Command of
ecDiscard: DebugLn(MessageStackDepth,
' *forcing next WM_ERASEBKGND to discard message');
ecDiscardNoRemove: DebugLn(MessageStackDepth,
' *forcing next WM_ERASEBKGND to discard message, no remove');
end;
DebugLn(MessageStackDepth, ' *erasebkgndstack: ', EraseBkgndStackToString);
{$endif}
EraseBkgndStack := (EraseBkgndStack shl EraseBkgndStackShift) or dword(Ord(Command));
end;
var
DoubleBufferDC: HDC = 0;
DoubleBufferBitmap: HBITMAP = 0;
DoubleBufferBitmapWidth: integer = 0;
DoubleBufferBitmapHeight: integer = 0;
function CheckMouseMovement: boolean;
// returns true if mouse did not move between lmousebutton down
var
lCursorPos: TPoint;
moveX, moveY: integer;
begin
GetCursorPos(lCursorPos);
moveX := lCursorPos.X - MouseDownPos.X;
moveY := lCursorPos.Y - MouseDownPos.Y;
Result := (-3 <= moveX) and (moveX <= 3) and (-3 <= moveY) and (moveY <= 3);
end;
//TODO: added temporarily to fix compilation,
//should probably removed soon, as the LCL does not listen to it.
type
PLMInsertText = ^TLMInsertText;
TLMInsertText = record
Msg : Cardinal;
NewText : String;
Length : Integer;
Position : Integer;
UserData : Pointer;
end;
{------------------------------------------------------------------------------
Function: WindowProc
Params: Window - The window that receives a message
Msg - The message received
WParam - Word parameter
LParam - Long-integer parameter
Returns: 0 if Msg is handled; non-zero long-integer result otherwise
Handles the messages sent to the specified window, in parameter Window, by
Windows or other applications
------------------------------------------------------------------------------}
Function
{$ifdef MSG_DEBUG}
RealWindowProc
{$else}
WindowProc
{$endif}
(Window: HWnd; Msg: UInt; WParam: Windows.WParam;
LParam: Windows.LParam): LResult; stdcall;
Var
LMessage: TLMessage;
menuItem: TObject;
menuHDC: HDC;
PLMsg: PLMessage;
R: TRect;
P: TPoint;
NewLeft, NewTop, NewWidth, NewHeight: integer;
lWinControl, ChildWinControl: TWinControl;
TargetObject: TObject;
WinProcess: Boolean;
NotifyUserInput: Boolean;
OverlayWindow: HWND;
TargetWindow: HWND;
eraseBkgndCommand: TEraseBkgndCommand;
winClassName: array[0..19] of char;
WindowInfo: PWindowInfo;
Flags: dword;
LMInsertText: TLMInsertText; // used by CB_INSERTSTRING, LB_INSERTSTRING
LMScroll: TLMScroll; // used by WM_HSCROLL
LMKey: TLMKey; // used by WM_KEYDOWN WM_KEYUP
LMChar: TLMChar; // used by WM_CHAR
LMMouse: TLMMouse; // used by WM_LBUTTONDBLCLK
LMMouseMove: TLMMouseMove; // used by WM_MOUSEMOVE
LMMouseEvent: TLMMouseEvent; // used by WM_MOUSEWHEEL
LMMove: TLMMove; // used by WM_MOVE
LMNotify: TLMNotify; // used by WM_NOTIFY
DrawListItemStruct: TDrawListItemStruct; //used by WM_DRAWITEM
CancelEndSession : Boolean;//use by WM_QUERYENDSESSION
procedure ShowHideTabPage(NotebookHandle: HWnd; Showing: boolean);
var
NoteBook: TCustomNotebook;
PageIndex, Flags: Integer;
PageHandle: HWND;
begin
Notebook := GetWindowInfo(NotebookHandle)^.WinControl as TCustomNotebook;
PageIndex := Windows.SendMessage(NotebookHandle, TCM_GETCURSEL, 0, 0);
if PageIndex = -1 then exit;
PageHandle := Notebook.CustomPage(PageIndex).Handle;
if Showing then
Flags := SW_SHOW
else
Flags := SW_HIDE;
Windows.ShowWindow(PageHandle, Flags);
if Showing then
NotebookFocusNewControl(Notebook, PageIndex);
end;
function GetMenuItemObject: TObject;
var MenuInfo: MENUITEMINFO;
MainMenuHandle: HMENU;
PopupMenu: TPopupMenu;
begin
Result:=nil;
MenuInfo.cbSize:=sizeof(MENUITEMINFO);
MenuInfo.fMask:=MIIM_DATA;
{first we have to decide if the command is from a popup menu or from the window main menu}
//if the 'PopupMenu' property exists, there is a big probability that the command is from a popup menu
PopupMenu := WindowInfo^.PopupMenu;
if PopupMenu<>nil then //processing popup menu
begin
WindowInfo^.PopupMenu := nil;
Result := PopupMenu.FindItem(Lo(WParam), fkCommand);
end;
if Result=nil then //if Result is still nil, process main menu
begin
MainMenuHandle := GetMenu(Window);
if GetMenuItemInfo(MainMenuHandle, Lo(WParam), false, @MenuInfo) then
Result := TObject(MenuInfo.dwItemData);
end;
end;
procedure SendPaintMessage;
var
DC: HDC;
DoubleBufferBitmapOld: HBITMAP;
PaintRegion: HRGN;
PS : TPaintStruct;
PaintMsg: TLMPaint;
ORect: TRect;
WindowOrg: Windows.POINT;
{$ifdef DEBUG_DOUBLEBUFFER}
ClipBox: Windows.RECT;
{$endif}
ParentPaintWindow: HWND;
WindowWidth, WindowHeight: Integer;
DCIndex: integer;
parLeft, parTop: integer;
useDoubleBuffer: boolean;
isNotebook: boolean;
isNativeControl: boolean;
lNotebookFound: boolean;
begin
// note: ignores the received DC
// do not use default deliver message
if lWinControl = nil then
begin
lWinControl := GetWindowInfo(Window)^.PWinControl;
if lWinControl = nil then exit;
end;
// create a paint message
GetClassName(Window, winClassName, 20);
isNotebook := TWin32WidgetSet(WidgetSet).ThemesActive and
CompareMem(@winClassName, @TabControlClsName, High(TabControlClsName)+1);
isNativeControl := not CompareMem(@winClassName, @ClsName, High(ClsName)+1);
ParentPaintWindow := 0;
// if hasTabParent and not isTabPage then background will be drawn in
// WM_ERASEBKGND and WM_CTLCOLORSTATIC for native controls
// sent by default paint handler
if WindowInfo^.isTabPage or (WindowInfo^.hasTabParent
and (not isNativeControl or (WParam <> 0))) then
begin
ParentPaintWindow := Window;
lNotebookFound := false;
while (ParentPaintWindow <> 0) and not lNotebookFound do
begin
// notebook is parent of window that has istabpage
if GetWindowInfo(ParentPaintWindow)^.isTabPage then
lNotebookFound := true;
ParentPaintWindow := Windows.GetParent(ParentPaintWindow);
end;
end;
// if painting background of some control for tabpage, don't handle erase background
// in parent of tabpage
if WindowInfo^.isTabPage then
PushEraseBkgndCommand(ecDiscard);
// check if double buffering is requested
useDoubleBuffer := (WParam = 0) and (lWinControl.DoubleBuffered
or TWin32WidgetSet(WidgetSet).ThemesActive);
{$ifdef MSG_DEBUG}
if useDoubleBuffer and (DoubleBufferDC <> 0) then
begin
DebugLn('ERROR: RECURSIVE PROBLEM! DOUBLEBUFFERED PAINT');
useDoubleBuffer := false;
end;
{$endif}
if useDoubleBuffer then
begin
DoubleBufferDC := Windows.CreateCompatibleDC(0);
GetWindowSize(Window, WindowWidth, WindowHeight);
if (DoubleBufferBitmapWidth < WindowWidth) or (DoubleBufferBitmapHeight < WindowHeight) then
begin
DC := Windows.GetDC(0);
if DoubleBufferBitmap <> 0 then
Windows.DeleteObject(DoubleBufferBitmap);
DoubleBufferBitmapWidth := WindowWidth;
DoubleBufferBitmapHeight := WindowHeight;
DoubleBufferBitmap := Windows.CreateCompatibleBitmap(DC, WindowWidth, WindowHeight);
Windows.ReleaseDC(0, DC);
end;
DoubleBufferBitmapOld := Windows.SelectObject(DoubleBufferDC, DoubleBufferBitmap);
PaintMsg.DC := DoubleBufferDC;
end;
{$ifdef MSG_DEBUG}
if useDoubleBuffer then
DebugLn(MessageStackDepth, ' *double buffering on DC: ', IntToHex(DoubleBufferDC, 8))
else
DebugLn(MessageStackDepth, ' *painting, but not double buffering');
{$endif}
WinProcess := false;
try
if WParam = 0 then
begin
// ignore first erase background on themed control, paint will do everything
if TWin32WidgetSet(WidgetSet).ThemesActive then
PushEraseBkgndCommand(ecDiscardNoRemove);
DC := Windows.BeginPaint(Window, @PS);
if TWin32WidgetSet(WidgetSet).ThemesActive then
EraseBkgndStack := EraseBkgndStack shr EraseBkgndStackShift;
if useDoubleBuffer then
begin
{$ifdef DEBUG_DOUBLEBUFFER}
ORect.Left := 0;
ORect.Top := 0;
ORect.Right := DoubleBufferBitmapWidth;
ORect.Bottom := DoubleBufferBitmapHeight;
Windows.FillRect(DoubleBufferDC, ORect, GetSysColorBrush(COLOR_DESKTOP));
{$endif}
PaintRegion := CreateRectRgn(0, 0, 1, 1);
if GetRandomRgn(DC, PaintRegion, SYSRGN) = 1 then
begin
// winnt returns in screen coordinates
// win9x returns in window coordinates
if Win32Platform = VER_PLATFORM_WIN32_NT then
begin
WindowOrg.X := 0;
WindowOrg.Y := 0;
Windows.ClientToScreen(Window, WindowOrg);
Windows.OffsetRgn(PaintRegion, -WindowOrg.X, -WindowOrg.Y);
end;
Windows.SelectClipRgn(DoubleBufferDC, PaintRegion);
end;
{$ifdef DEBUG_DOUBLEBUFFER}
Windows.GetClipBox(DoubleBufferDC, ClipBox);
DebugLn('Double buffering in DC ', IntToHex(DoubleBufferDC, 8), ' with clipping rect (',
IntToStr(ClipBox.Left), ',', IntToStr(ClipBox.Top), ';',
IntToStr(ClipBox.Right), ',', IntToStr(ClipBox.Bottom), ')');
{$endif}
// a copy of the region is selected into the DC, so we
// can free our region immediately
Windows.DeleteObject(PaintRegion);
end;
end else begin
DC := WParam;
PaintRegion := 0;
end;
if ParentPaintWindow <> 0 then
GetWin32ControlPos(Window, ParentPaintWindow, parLeft, parTop);
if not GetLCLClientBoundsOffset(lWinControl, ORect) then
begin
ORect.Left := 0;
ORect.Top := 0;
{ we don't use ORect.Right and ORect.Bottom, initialize here if needed }
end;
PaintMsg.Msg := LM_PAINT;
PaintMsg.PaintStruct := @PS;
if not useDoubleBuffer then
PaintMsg.DC := DC;
if not WindowInfo^.hasTabParent and not isNotebook then
lWinControl.EraseBackground(PaintMsg.DC);
if ParentPaintWindow <> 0 then
begin
{$ifdef MSG_DEBUG}
DebugLn(MessageStackDepth, ' *painting background by sending paint message to parent window ',
IntToHex(ParentPaintWindow, 8));
{$endif}
// tabpage parent and got a dc to draw in, divert paint to parent
DCIndex := Windows.SaveDC(PaintMsg.DC);
MoveWindowOrgEx(PaintMsg.DC, -parLeft, -parTop);
Windows.SendMessage(ParentPaintWindow, WM_PAINT, PaintMsg.DC, 0);
Windows.RestoreDC(PaintMsg.DC, DCIndex);
end;
if (WParam = 0) or not WindowInfo^.hasTabParent then
begin
DCIndex := Windows.SaveDC(PaintMsg.DC);
MoveWindowOrgEx(PaintMsg.DC, ORect.Left, ORect.Top);
{$ifdef DEBUG_DOUBLEBUFFER}
Windows.GetClipBox(PaintMsg.DC, ClipBox);
DebugLn('LCL Drawing in DC ', IntToHex(PaintMsg.DC, 8), ' with clipping rect (',
IntToStr(ClipBox.Left), ',', IntToStr(ClipBox.Top), ';',
IntToStr(ClipBox.Right), ',', IntToStr(ClipBox.Bottom), ')');
{$endif}
DeliverMessage(lWinControl, PaintMsg);
Windows.RestoreDC(PaintMsg.DC, DCIndex);
end;
if useDoubleBuffer then
Windows.BitBlt(DC, 0, 0, WindowWidth, WindowHeight, DoubleBufferDC, 0, 0, SRCCOPY);
if WParam = 0 then
Windows.EndPaint(Window, @PS);
finally
if useDoubleBuffer then
begin
SelectObject(DoubleBufferDC, DoubleBufferBitmapOld);
DeleteDC(DoubleBufferDC);
DoubleBufferDC := 0;
{$ifdef DEBUG_DOUBLEBUFFER}
if CopyBitmapToClipboard then
begin
// Windows.OpenClipboard(0);
// Windows.EmptyClipboard;
// Windows.SetClipboardData(CF_BITMAP, DoubleBufferBitmap);
// Windows.CloseClipboard;
CopyBitmapToClipboard := false;
end;
{$endif}
end;
end;
end;
procedure CheckListBoxLButtonDown;
var
I: Integer;
ItemRect: Windows.Rect;
MousePos: Windows.Point;
begin
MousePos.X := LMMouse.Pos.X;
MousePos.Y := LMMouse.Pos.Y;
for I := 0 to Windows.SendMessage(Window, LB_GETCOUNT, 0, 0) - 1 do
begin
Windows.SendMessage(Window, LB_GETITEMRECT, I, PtrInt(@ItemRect));
ItemRect.Right := ItemRect.Left + ItemRect.Bottom - ItemRect.Top;
if Windows.PtInRect(ItemRect, MousePos) then
begin
// item clicked: toggle
if I < TCheckListBox(lWinControl).Items.Count then
TCheckListBox(lWinControl).Checked[I] := not TCheckListBox(lWinControl).Checked[I];
// can only click one item
exit;
end;
end;
end;
procedure ClearSiblingRadioButtons(RadioButton: TRadioButton);
var
Parent: TWinControl;
Sibling: TControl;
i: Integer;
begin
Parent := RadioButton.Parent;
for i:= 0 to Parent.ControlCount - 1 do begin
Sibling := Parent.Controls[i];
if (Sibling is TRadioButton) and (Sibling<>RadioButton) and
(TRadioButton(Sibling).HandleAllocated) then
Windows.SendMessage(TRadioButton(Sibling).Handle, BM_SETCHECK,
Windows.WParam(BST_UNCHECKED), 0);
end;
end;
// sets the text of the combobox,
// because some events are risen, before the text is actually changed
procedure UpdateComboBoxText(ComboBox: TCustomComboBox);
var
Index: Integer;
begin
with ComboBox do begin
Index := ItemIndex;
// Index might be -1, if current text is not in the list.
if (Index>=0) then
Text := Items[Index]
end;
end;
procedure DestroyFloatSpinEditBuddy(SpinEditHandle: HWND);
var
Buddy: HWND;
begin
Buddy := SendMessage(SpinEditHandle, UDM_GETBUDDY, 0, 0);
DestroyWindow(Buddy);
end;
procedure EnableFloatSpinEditBuddy(SpinEditHandle: HWND; Enable: boolean);
var
Buddy: HWND;
begin
Buddy := SendMessage(SpinEditHandle, UDM_GETBUDDY, 0, 0);
Windows.EnableWindow(Buddy, Enable);
end;
procedure DisposeComboEditWindowInfo(ComboBox: TCustomComboBox);
var
Buddy: HWND;
begin
Buddy := Windows.GetTopWindow(ComboBox.Handle);
if Buddy<>HWND(nil) then
DisposeWindowInfo(Buddy);
end;
procedure HandleScrollMessage(LMsg: integer);
var
ScrollbarHandle: HWND;
ScrollInfo: TScrollInfo;
begin
ScrollbarHandle := HWND(LParam);
if ScrollbarHandle<>0 then
lWinControl := GetWindowInfo(ScrollbarHandle)^.WinControl;
if lWinControl is TCustomTrackBar then
begin
LMessage.Msg := LM_CHANGED;
exit;
end;
PLMsg:=@LMScroll;
with LMScroll do
begin
Msg := LMsg;
ScrollCode := SmallInt(Lo(WParam));
SmallPos := 0;
ScrollBar := ScrollbarHandle;
Pos := 0;
end;
if not (Lo(WParam) in [SB_THUMBTRACK, SB_THUMBPOSITION]) then Exit;
// For thumb messges, retrieve the real position,
ScrollInfo.cbSize := SizeOf(ScrollInfo);
if Lo(WParam) = SB_THUMBTRACK
then begin
ScrollInfo.fMask := SIF_TRACKPOS;
// older windows versions may not support trackpos, so fill it with some default
ScrollInfo.nTrackPos := Hi(WParam);
end
else begin
ScrollInfo.fMask := SIF_POS;
// older windows versions may not support trackpos, so fill it with some default
ScrollInfo.nPos := Hi(WParam);
end;
if ScrollbarHandle <> 0
then begin
// The message is send by a scrollbar
GetScrollInfo(ScrollbarHandle, SB_CTL, ScrollInfo);
end
else begin
// The message is send by a window's standard scrollbar
if LMsg = LM_HSCROLL
then GetScrollInfo(Window, SB_HORZ, ScrollInfo)
else GetScrollInfo(Window, SB_VERT, ScrollInfo);
end;
with LMScroll do
begin
if Lo(WParam) = SB_THUMBTRACK
then Pos := ScrollInfo.nTrackPos
else Pos := (ScrollInfo.nPos and $FFFF0000) or Hi(WParam);
// Note on the above
// When using the scrollwheel, windows sends SB_THUMBTRACK
// messages, but only when scroll.max < 32K. So in that case
// Hi(WParam) won't cycle.
// When ending scrollbar tracking we also get those
// messages. Now Hi(WParam) is cycling.
// To get the correct value you need to use GetScrollInfo.
//
// Now there is a problem. GetScrollInfo returns the old position
// while using the wheelmouse, and during tracking it returns
// the new position.
// To get around this, I use the most significant part of the
// value returned by ScrollInfo, since that is always correct
// The missing least significant part is given by Hi(WParam)
// (since it is cycling) and is also always valid.
// So the combination of both also is.
// In the case of the wheelmouse this only works if the
// difference between the old pos and the new pos is < 64K.
// I think we safely can asuume that (you wont get messages
// anyhow if the range was > 32K :).
// MWE.
if Pos < High(SmallPos)
then SmallPos := Pos
else SmallPos := High(SmallPos);
end;
end;
procedure HandleSetCursor;
var
lControl: TControl;
BoundsOffset: TRect;
begin
if (lWinControl <> nil) and not (csDesigning in lWinControl.ComponentState)
and (Lo(LParam) = HTCLIENT) then
begin
Windows.GetCursorPos(Windows.POINT(P));
Windows.ScreenToClient(Window, Windows.POINT(P));
if GetLCLClientBoundsOffset(lWinControl.Parent, BoundsOffset) then
begin
Dec(P.X, BoundsOffset.Left);
Dec(P.Y, BoundsOffset.Top);
end;
// statictext controls do not get WM_SETCURSOR messages...
lControl := lWinControl.ControlAtPos(P, false, true);
if lControl = nil then
lControl := lWinControl;
if lControl.Cursor <> crDefault then
begin
Windows.SetCursor(Windows.LoadCursor(0, LclCursorToWin32CursorMap[lControl.Cursor]));
LMessage.Result := 1;
end;
end;
if LMessage.Result = 0 then
begin
LMessage.Msg := LM_SETCURSOR;
LMessage.WParam := WParam;
LMessage.LParam := LParam;
end;
WinProcess := false;
end;
procedure HandleSysCommand;
var
ParentForm: TCustomForm;
prevFocus: HWND;
begin
// forward keystroke to show window menu, if parent form has no menu
// if wparam contains SC_KEYMENU, lparam contains key pressed
// keymenu+space should always bring up system menu
if ((WParam and $FFF0) = SC_KEYMENU) and (lWinControl <> nil)
and (lParam <> VK_SPACE) then
begin
ParentForm := GetParentForm(lWinControl);
if (ParentForm <> nil) and (ParentForm.Menu = nil)
and (Application <> nil) and (Application.MainForm <> nil)
and (Application.MainForm <> ParentForm)
and Application.MainForm.HandleAllocated then
begin
targetWindow := Application.MainForm.Handle;
if IsWindowEnabled(targetWindow) and IsWindowVisible(targetWindow) then
begin
prevFocus := Windows.GetFocus;
Windows.SetFocus(targetWindow);
PLMsg^.Result := Windows.SendMessage(targetWindow, WM_SYSCOMMAND, WParam, LParam);
Windows.SetFocus(prevFocus);
WinProcess := false;
end;
end;
end
end;
function IsComboEditSelection: boolean;
begin
Result := WindowInfo^.isComboEdit and (ComboBoxHandleSizeWindow = Windows.GetParent(Window));
end;
procedure HandleSpinEditChange(ASpinEdit: TCustomFloatSpinEdit);
var
lWindowInfo: PWindowInfo;
lNewValue: single;
begin
lWindowInfo := GetWindowInfo(ASpinEdit.Handle);
if lWindowInfo = @DefaultWindowInfo then exit;
lNewValue := StrToFloatDef(ASpinEdit.Text, lWindowInfo^.spinValue);
if lNewValue <> lWindowInfo^.spinValue then
begin
lWindowInfo^.spinValue := lNewValue;
LMessage.Msg := CM_TEXTCHANGED;
end;
end;
procedure HandleSpinEditDeltaPos(AUpDownMsg: PNMUpDown);
var
lSpinEdit: TCustomFloatSpinEdit;
spinHandle: HWND;
newValue: single;
begin
lSpinEdit := TCustomFloatSpinEdit(WindowInfo^.WinControl);
newValue := WindowInfo^.spinValue + AUpDownMsg^.iDelta * lSpinEdit.Increment;
if (lSpinEdit.MinValue <> 0) or (lSpinEdit.MaxValue <> 0) then
begin
if newValue > lSpinEdit.MaxValue then
newValue := lSpinEdit.MaxValue;
if newValue < lSpinEdit.MinValue then
newValue := lSpinEdit.MinValue;
end;
spinHandle := AUpDownMsg^.hdr.hwndFrom;
UpdateFloatSpinEditText(spinHandle, NewValue, lSpinEdit.DecimalPlaces);
Windows.SendMessage(spinHandle, UDM_SETPOS32, 0, 500);
WindowInfo^.spinValue := newValue;
end;
procedure SetMinMaxInfo(var MinMaxInfo: TMINMAXINFO);
procedure SetWin32SizePoint(AWidth, AHeight: integer; var pt: TPoint);
var
IntfWidth, IntfHeight: integer;
begin
// 0 means no constraint
if (AWidth=0) and (AHeight=0) then exit;
IntfWidth := AWidth;
IntfHeight := AHeight;
LCLFormSizeToWin32Size(TCustomForm(lWinControl), IntfWidth, IntfHeight);
if AWidth>0 then
pt.X:= IntfWidth;
if AHeight>0 then
pt.Y := IntfHeight;
end;
begin
if (lWinControl=nil) or not (lWinControl is TCustomForm) then exit;
with lWinControl.Constraints do begin
SetWin32SizePoint(MinWidth, MinHeight, MinMaxInfo.ptMinTrackSize);
SetWin32SizePoint(MaxWidth, MaxHeight, MinMaxInfo.ptMaxSize);
SetWin32SizePoint(MaxWidth, MaxHeight, MinMaxInfo.ptMaxTrackSize);
end;
end;
Begin
Assert(False, 'Trace:WindowProc - Start');
LMessage.Result := 0;
LMessage.Msg := LM_NULL;
PLMsg := @LMessage;
WinProcess := True;
NotifyUserInput := False;
Assert(False, 'Trace:WindowProc - Getting Object With Callback Procedure');
WindowInfo := GetWindowInfo(Window);
if WindowInfo^.isChildEdit then
begin
// combobox child edit weirdness
// prevent combobox WM_SIZE message to get/set/compare text to list, to select text
if IsComboEditSelection then
begin
case Msg of
WM_GETTEXTLENGTH, EM_SETSEL:
begin
Result := 0;
exit;
end;
WM_GETTEXT:
begin
if WParam > 0 then
PChar(LParam)^ := #0;
Result := 0;
exit;
end;
end;
end;
lWinControl := WindowInfo^.AWinControl;
// filter messages we want to pass on to LCL
if (Msg <> WM_KILLFOCUS) and (Msg <> WM_SETFOCUS) and (Msg <> WM_NCDESTROY)
and ((Msg < WM_KEYFIRST) or (Msg > WM_KEYLAST))
and ((Msg < WM_MOUSEFIRST) or (Msg > WM_MOUSELAST)) then
begin
Result := CallDefaultWindowProc(Window, Msg, WParam, LParam);
exit;
end;
end else begin
lWinControl := WindowInfo^.WinControl;
end;
{$ifdef MSG_DEBUG}
DebugLn('lWinControl: ',DbgSName(lWinControl));
{$endif}
if (IgnoreNextCharWindow <> 0) and ((Msg = WM_CHAR) or (Msg = WM_SYSCHAR)) then
begin
if IgnoreNextCharWindow = Window then
begin
IgnoreNextCharWindow := 0;
{$ifdef MSG_DEBUG}
DebugLn(MessageStackDepth, ' *ignoring this character');
{$endif}
Result := 1;
exit;
end;
IgnoreNextCharWindow := 0;
end;
Assert(False, 'Trace:WindowProc - Getting Callback Object');
Assert(False, 'Trace:WindowProc - Checking Proc');
Assert(False, Format('Trace:WindowProc - Window Value: $%S-%d; Msg Value: %S; WParam: $%S; LParam: $%S', [IntToHex(Window, 4), Window, WM_To_String(Msg), IntToHex(WParam, 4), IntToHex(LParam, 4)]));
Case Msg Of
WM_ACTIVATE:
Begin
Case Lo(WParam) Of
WA_ACTIVE, WA_CLICKACTIVE:
Begin
LMessage.Msg := LM_ACTIVATE
End;
WA_INACTIVE:
Begin
LMessage.Msg := LM_DEACTIVATE;
End;
End;
End;
WM_ACTIVATEAPP:
Begin
if Window = TWin32WidgetSet(WidgetSet).AppHandle then
begin
if WParam <> 0 then
begin
Windows.SetWindowPos(TWin32WidgetSet(WidgetSet).AppHandle, HWND_TOP,
0, 0, 0, 0, SWP_NOMOVE or SWP_NOSIZE or SWP_NOACTIVATE);
end;
// activate/deactivate main window
if (Application <> nil) and (Application.MainForm <> nil) and
Application.MainForm.HandleAllocated then
begin
CallDefaultWindowProc(Application.MainForm.Handle, WM_NCACTIVATE, WParam, 0);
end;
end;
End;
BM_SETCHECK:
Begin
LMessage.Msg := LM_CHANGED;
End;
WM_CAPTURECHANGED:
Begin
LMessage.Msg := LM_CAPTURECHANGED;
End;
CB_DELETESTRING, LB_DELETESTRING:
Begin
LMessage.Msg := LM_DELETETEXT;
End;
CB_INSERTSTRING, LB_INSERTSTRING:
Begin
PLMsg:=@LMInsertText;
With LMInsertText Do
Begin
Msg := LM_INSERTTEXT;
Position := WParam;
NewText := PChar(LParam);
Length := System.Length(NewText);
// UserData := Pointer(GetWindowLong(Window, GWL_USERDATA));
End;
End;
WM_CHAR:
Begin
PLMsg:=@LMChar;
With LMChar Do
Begin
Msg := CN_CHAR;
KeyData := LParam;
CharCode := Word(WParam);
Result := 0;
Assert(False,Format('WM_CHAR KeyData= %d CharCode= %d ',[KeyData,CharCode]));
End;
WinProcess := false;
End;
WM_CLOSE:
Begin
if (Window = TWin32WidgetSet(WidgetSet).AppHandle) and
(Application.MainForm <> nil) then
begin
Windows.SendMessage(Application.MainForm.Handle, WM_CLOSE, 0, 0);
end else begin
LMessage.Msg := LM_CLOSEQUERY;
end;
// default is to destroy window, inhibit
WinProcess := false;
End;
WM_COMMAND:
Begin
if LParam=0 then
begin
{menuitem or shortcut}
TargetObject := GetMenuItemObject;
if TargetObject is TMenuItem then
begin
if (Hi(WParam) = 0) or (Hi(WParam) = 1) then
begin
LMessage.Msg := LM_ACTIVATE;
TargetObject.Dispatch(LMessage);
end;
lWinControl := nil;
end;
end else begin
lWinControl := GetWindowInfo(LParam)^.WinControl;
// buddy controls use 'awincontrol' to designate associated wincontrol
if lWinControl = nil then
lWinControl := GetWindowInfo(LParam)^.AWinControl;
if lWinControl is TCustomButton then
case Hi(WParam) of
BN_CLICKED: LMessage.Msg := LM_CLICKED;
BN_KILLFOCUS: LMessage.Msg := LM_EXIT;
end
else if (lWinControl is TCustomEdit) then
case Hi(WParam) of
EN_CHANGE: LMessage.Msg := CM_TEXTCHANGED;
end
else if (lWinControl is TCustomFloatSpinEdit) then
case Hi(WParam) of
EN_CHANGE: HandleSpinEditChange(TCustomFloatSpinEdit(lWinControl));
end
else if (lWinControl is TCustomMemo) then
case Hi(WParam) of
// multiline edit doesn't send EN_CHANGE, so use EN_UPDATE
EN_UPDATE: LMessage.Msg := CM_TEXTCHANGED;
end
else if (lWinControl is TCustomListBox) then
case Hi(WParam) of
LBN_SELCHANGE: LMessage.Msg := LM_SELCHANGE;
end
else if lWinControl is TCustomCombobox then
case Hi(WParam) of
CBN_EDITCHANGE: LMessage.Msg := LM_CHANGED;
{ CBN_EDITCHANGE is only sent after the user changes the edit box.
CBN_SELCHANGE is sent when the user changes the text by
selecting in the list, but before text is actually changed.
itemindex is updated, so set text manually }
CBN_SELCHANGE: begin
UpdateComboBoxText(TCustomComboBox(lWinControl));
LMessage.Msg := LM_SELCHANGE;
end;
{ closeup message is sent before text is actually changed... *sigh*
itemindex is updated, so set text manually }
CBN_CLOSEUP:
UpdateComboBoxText(TCustomComboBox(lWinControl));
end;
end;
// no specific message found? try send a general msg
if (LMessage.Msg = LM_NULL) and (lWinControl <> nil) then
lWinControl.Perform(CN_COMMAND, WParam, LParam);
End;
{
* Besides the fact that LCL does not respond to LM_CREATE, this code is
probably never reached anyway, as the callback is not set until after
window creation
WM_CREATE:
Begin
Assert(False, 'Trace:WindowProc - Got WM_CREATE');
LMessage.Msg := LM_CREATE;
End;
}
WM_CTLCOLORMSGBOX..WM_CTLCOLORSTATIC:
begin
// it's needed for winxp themes where controls send the WM_ERASEBKGND
// message to their parent to clear their background and then draw
// transparently
// only static and button controls have transparent parts
// others need to erased with their window color
// scrollbar also has buttons
if (Msg = WM_CTLCOLORSTATIC) or (Msg = WM_CTLCOLORBTN)
or (Msg = WM_CTLCOLORSCROLLBAR) then
begin
if GetWindowInfo(LParam)^.hasTabParent then
begin
// need to draw transparently, draw background
GetWin32ControlPos(LParam, Window, P.X, P.Y);
MoveWindowOrgEx(WParam, -P.X, -P.Y);
SendPaintMessage;
MoveWindowOrgEx(WParam, P.X, P.Y);
LMessage.Result := GetStockObject(HOLLOW_BRUSH);
SetBkMode(WParam, TRANSPARENT);
WinProcess := false;
end;
end;
if WinProcess then
begin
ChildWinControl := GetWindowInfo(LParam)^.WinControl;
if ChildWinControl = nil then
ChildWinControl := GetWindowInfo(LParam)^.AWinControl;
if ChildWinControl <> nil then
begin
Windows.SetTextColor(HDC(WParam), Windows.COLORREF(ColorToRGB(ChildWinControl.Font.Color)));
Windows.SetBkColor(HDC(WParam), Windows.COLORREF(ColorToRGB(ChildWinControl.Brush.Color)));
LMessage.Result := LResult(ChildWinControl.Brush.Handle);
// Override default handling
WinProcess := false;
end;
end;
end;
WM_CLEAR:
begin
LMessage.Msg := LM_CLEARSEL;
end;
WM_COPY:
Begin
LMessage.Msg := LM_COPYTOCLIP;
End;
WM_CUT:
Begin
LMessage.Msg := LM_CUTTOCLIP;
End;
WM_DESTROY:
Begin
Assert(False, 'Trace:WindowProc - Got WM_DESTROY');
if lWinControl is TCheckListBox then
TWin32CheckListBoxStrings.DeleteItemRecords(Window);
if lWinControl is TCustomFloatSpinEdit then
DestroyFloatSpinEditBuddy(Window);
if lWinControl is TCustomComboBox then
DisposeComboEditWindowInfo(TCustomComboBox(lWinControl));
if WindowInfo^.Overlay<>HWND(nil) then
Windows.DestroyWindow(WindowInfo^.Overlay);
LMessage.Msg := LM_DESTROY;
End;
WM_DESTROYCLIPBOARD:
Begin
if assigned(OnClipBoardRequest) then begin
{$IFDEF VerboseWin32Clipbrd}
debugln('WM_DESTROYCLIPBOARD');
{$ENDIF}
OnClipBoardRequest(0, nil);
OnClipBoardRequest := nil;
LMessage.Result := 0;
end;
End;
WM_DRAWITEM:
Begin
if (WParam = 0) and (PDrawItemStruct(LParam)^.ctlType = ODT_MENU) then
begin
menuItem := TObject(PDrawItemStruct(LParam)^.itemData);
if menuItem is TMenuItem then
begin
DrawMenuItem(TMenuItem(menuItem), PDrawItemStruct(LParam)^._hDC, PDrawItemStruct(LParam)^.rcItem, PDrawItemStruct(LParam)^.itemState and ODS_SELECTED <> 0);
end
end;
// TODO: this could crash for a MenuItem.
WindowInfo := GetWindowInfo(PDrawItemStruct(LParam)^.hwndItem);
if WindowInfo^.WinControl<>nil then
lWinControl := WindowInfo^.WinControl;
{$IFDEF MSG_DEBUG}
with PDrawItemStruct(LParam)^ do
writeln(format('Received WM_DRAWITEM type %d handle %x', [ctlType, hwndItem]));
{$ENDIF}
if ((lWinControl is TCustomListbox) and
(TCustomListBox(lWinControl).Style <> lbStandard)) or
((lWinControl is TCustomCombobox) and
((TCustomCombobox(lWinControl).Style = csOwnerDrawFixed) or
(TCustomCombobox(lWinControl).Style = csOwnerDrawVariable))) then
begin
if PDrawItemStruct(LParam)^.itemID <> dword(-1) then
begin
LMessage.Msg := LM_DRAWLISTITEM;
TLMDrawListItem(LMessage).DrawListItemStruct := @DrawListItemStruct;
with DrawListItemStruct do begin
ItemID := PDrawItemStruct(LParam)^.itemID;
Area := PDrawItemStruct(LParam)^.rcItem;
ItemState := TOwnerDrawState(PDrawItemStruct(LParam)^.itemState);
DC := PDrawItemStruct(LParam)^._hDC;
end;
if WindowInfo <> @DefaultWindowInfo then
begin
WindowInfo^.DrawItemIndex := PDrawItemStruct(LParam)^.itemID;
WindowInfo^.DrawItemSelected := (PDrawItemStruct(LParam)^.itemState
and ODS_SELECTED) = ODS_SELECTED;
end;
WinProcess := false;
end;
end else begin
with TLMDrawItems(LMessage) do
begin
Msg := LM_DRAWITEM;
Ctl := 0;
DrawItemStruct := PDrawItemStruct(LParam);
end;
WinProcess := false;
end;
End;
WM_ENABLE:
Begin
If WParam <> 0 Then
LMessage.Msg := LM_SETEDITABLE;
If Window=TWin32WidgetSet(WidgetSet).FAppHandle then
if WParam=0 then
DisableApplicationWindows(Window)
else
EnableApplicationWindows(Window);
If (lWinControl is TCustomFloatSpinEdit) then
EnableFloatSpinEditBuddy(Window, WParam<>0);
// ugly hack to give bitbtns a nice look
// When no theming active, the internal image needs to be
// recreated when the enabled state is changed
if not TWin32WidgetSet(WidgetSet).ThemesActive
and (lWinControl is TCustomBitBtn)
then DrawBitBtnImage(TCustomBitBtn(lWinControl), PChar(TCustomBitBtn(lWinControl).Caption));
End;
WM_ERASEBKGND:
Begin
eraseBkgndCommand := TEraseBkgndCommand(EraseBkgndStack and EraseBkgndStackMask);
{$ifdef MSG_DEBUG}
case eraseBkgndCommand of
ecDefault: DebugLn(MessageStackDepth, ' *command: default');
ecDiscardNoRemove, ecDiscard: DebugLn(MessageStackDepth, ' *command: completely ignore');
end;
DebugLn(MessageStackDepth, ' *erasebkgndstack: ', EraseBkgndStackToString);
{$endif}
if eraseBkgndCommand <> ecDiscardNoRemove then
EraseBkgndStack := EraseBkgndStack shr EraseBkgndStackShift;
if eraseBkgndCommand in [ecDiscard, ecDiscardNoRemove] then
begin
Result := 0;
exit;
end;
if not WindowInfo^.hasTabParent then
begin
if TWin32WidgetSet(WidgetSet).ThemesActive and WindowInfo^.isGroupBox
and (lWinControl <> nil) then
begin
// Groupbox (which is a button) doesn't erase it's background properly; force repaint
lWinControl.EraseBackground(WParam);
LMessage.Result := 1;
end else begin
LMessage.Msg := LM_ERASEBKGND;
LMessage.WParam := WParam;
LMessage.LParam := LParam;
end;
end else begin
if (lWinControl = nil) or not (csOpaque in lWinControl.ControlStyle) then
begin
SendPaintMessage;
LMessage.Result := 1;
end;
end;
WinProcess := false;
End;
WM_EXITMENULOOP:
// is it a popup menu
if longbool(WPARAM) and assigned(WindowInfo^.PopupMenu) then
WindowInfo^.PopupMenu.Close;
WM_GETDLGCODE:
Begin
LMessage.Result := DLGC_WANTALLKEYS;
WinProcess := false;
End;
{
* TODO: make it work... icon does not show up yet, so better disable it
WM_GETICON:
begin
if WindowInfo^.WinControl is TCustomForm then
begin
LMessage.Result := TCustomForm(WindowInfo^.WinControl).GetIconHandle;
WinProcess := false;
end;
end;
}
WM_GETMINMAXINFO:
SetMinMaxInfo(PMINMAXINFO(LParam)^);
WM_HSCROLL:
HandleScrollMessage(LM_HSCROLL);
WM_KEYDOWN:
Begin
NotifyUserInput := True;
PLMsg:=@LMKey;
With LMKey Do
Begin
Msg := CN_KEYDOWN;
KeyData := LParam;
CharCode := Word(WParam);
Result := 0;
Assert(False,Format('WM_KEYDOWN KeyData= %d CharCode= %d ',[KeyData,CharCode]));
Assert(False,' lWinControl= '+TComponent(lWinControl).Name+':'+lWinControl.ClassName);
End;
WinProcess := false;
End;
WM_KEYUP:
Begin
NotifyUserInput := True;
PLMsg:=@LMKey;
With LMKey Do
Begin
Msg := CN_KEYUP;
KeyData := LParam;
CharCode := Word(WParam);
Result := 0;
Assert(False,Format('WM_KEYUP KeyData= %d CharCode= %d ',[KeyData,CharCode]));
End;
WinProcess := false;
End;
WM_KILLFOCUS:
Begin
{$ifdef DEBUG_CARET}
DebugLn('WM_KILLFOCUS received for window ', IntToHex(Window, 8));
{$endif}
LMessage.Msg := LM_KILLFOCUS;
LMessage.WParam := WParam;
End;
//TODO:LM_KILLCHAR,LM_KILLWORD,LM_KILLLINE
WM_LBUTTONDBLCLK:
Begin
NotifyUserInput := True;
PLMsg:=@LMMouse;
With LMMouse Do
Begin
Msg := LM_LBUTTONDBLCLK;
XPos := SmallInt(Lo(LParam));
YPos := SmallInt(Hi(LParam));
Keys := WParam;
End;
// CheckListBox functionality
if lWinControl is TCheckListBox then
CheckListBoxLButtonDown;
End;
WM_LBUTTONDOWN:
Begin
// if mouse-click, focus-change, mouse-click, cursor hasn't moved:
// simulate double click, assume focus change due to first mouse-click
if (MouseDownFocusStatus = mfFocusChanged) and (MouseDownFocusWindow = Window)
and (GetTickCount - MouseDownTime <= GetDoubleClickTime)
and CheckMouseMovement then
begin
PostMessage(Window, WM_LBUTTONDBLCLK, WParam, LParam);
end;
MouseDownTime := GetTickCount;
MouseDownWindow := Window;
MouseDownFocusWindow := 0;
MouseDownFocusStatus := mfFocusSense;
GetCursorPos(MouseDownPos);
NotifyUserInput := True;
PLMsg:=@LMMouse;
With LMMouse Do
Begin
Msg := LM_LBUTTONDOWN;
XPos := SmallInt(Lo(LParam));
YPos := SmallInt(Hi(LParam));
Keys := WParam;
End;
// CheckListBox functionality
if lWinControl is TCheckListBox then
CheckListBoxLButtonDown;
// focus window
if (Windows.GetFocus <> Window) and
((lWinControl = nil) or (lWinControl.CanFocus)) then
Windows.SetFocus(Window);
End;
WM_LBUTTONUP:
Begin
if (MouseDownWindow = Window) and (MouseDownFocusStatus = mfNone) then
MouseDownFocusStatus := mfFocusSense;
NotifyUserInput := True;
PLMsg:=@LMMouse;
With LMMouse Do
Begin
Msg := LM_LBUTTONUP;
XPos := SmallInt(Lo(LParam));
YPos := SmallInt(Hi(LParam));
Keys := WParam;
End;
End;
WM_MBUTTONDBLCLK:
Begin
NotifyUserInput := True;
PLMsg:=@LMMouse;
With LMMouse Do
Begin
Msg := LM_MBUTTONDBLCLK;
XPos := SmallInt(Lo(LParam));
YPos := SmallInt(Hi(LParam));
Keys := WParam;
End;
End;
WM_MBUTTONDOWN:
Begin
NotifyUserInput := True;
PLMsg:=@LMMouse;
With LMMouse Do
Begin
Msg := LM_MBUTTONDOWN;
XPos := SmallInt(Lo(LParam));
YPos := SmallInt(Hi(LParam));
Keys := WParam;
End;
End;
WM_MBUTTONUP:
Begin
NotifyUserInput := True;
PLMsg:=@LMMouse;
With LMMouse Do
Begin
Msg := LM_MBUTTONUP;
XPos := SmallInt(Lo(LParam));
YPos := SmallInt(Hi(LParam));
Keys := WParam;
End;
End;
WM_MOUSEHOVER:
Begin
NotifyUserInput := True;
LMessage.Msg := LM_ENTER;
End;
WM_MOUSELEAVE:
Begin
NotifyUserInput := True;
LMessage.Msg := LM_LEAVE;
End;
WM_MOUSEMOVE:
Begin
NotifyUserInput := True;
PLMsg:=@LMMouseMove;
With LMMouseMove Do
Begin
Msg := LM_MOUSEMOVE;
XPos := SmallInt(Lo(LParam));
YPos := SmallInt(Hi(LParam));
Keys := WParam;
// check if this is a spurious WM_MOUSEMOVE message, pos not actually changed
if (XPos = WindowInfo^.MouseX) and (YPos = WindowInfo^.MouseY) then
begin
// do not fire message after all (position not changed)
Msg := LM_NULL;
NotifyUserInput := false;
end else
if WindowInfo <> @DefaultWindowInfo then
begin
// position changed, update window info
WindowInfo^.MouseX := XPos;
WindowInfo^.MouseY := YPos;
end;
End;
End;
WM_MOUSEWHEEL:
Begin
NotifyUserInput := True;
PLMsg:=@LMMouseEvent;
With LMMouseEvent Do
Begin
X := SmallInt(Lo(LParam));
Y := SmallInt(Hi(LParam));
// check if mouse cursor within this window, otherwise send message to window the mouse is hovering over
P.X := X;
P.Y := Y;
TargetWindow := TWin32WidgetSet(WidgetSet).WindowFromPoint(P);
if TargetWindow = HWND(nil) then
exit;
// check if the window is an edit control of a combobox, if so,
// redirect it to the combobox, not the edit control
if GetWindowInfo(TargetWindow)^.isComboEdit then
TargetWindow := Windows.GetParent(TargetWindow);
// Don't send the message to the overlay window, to avoid recursion
if (TargetWindow <> Window) and (TargetWindow<>WindowInfo^.Overlay) then
begin
Result := SendMessage(TargetWindow, WM_MOUSEWHEEL, WParam, LParam);
exit;
end;
// the mousewheel message is for us
// windows handles combobox's mousewheel messages
if lWinControl.FCompStyle <> csComboBox then
begin
Msg := LM_MOUSEWHEEL;
Button := Lo(WParam);
WheelDelta := SmallInt(Hi(WParam));
State := GetShiftState;
UserData := Pointer(GetWindowLong(Window, GWL_USERDATA));
WinProcess := false;
end;
end;
end;
{$IFDEF EnableWMDropFiles}
WM_DROPFILES:
begin
LMessage.Msg := LM_DROPFILES;
LMessage.WParam := WParam;
LMessage.LParam := LParam;
end;
{$ENDIF}
//TODO:LM_MOVEPAGE,LM_MOVETOROW,LM_MOVETOCOLUMN
WM_NCACTIVATE:
begin
// do not allow main form to be deactivated
if (Application <> nil) and (Application.MainForm <> nil) and
Application.MainForm.HandleAllocated and (Window = Application.MainForm.Handle) and
(WParam = 0) then
begin
WParam := 1;
end;
end;
WM_NCHITTEST:
begin
if (lWinControl <> nil) then begin
if (lWinControl.FCompStyle = csHintWindow) then
begin
LMessage.Result := HTTRANSPARENT;
WinProcess := false;
end
else if (lWinControl is TCustomGroupBox) then
begin
LMessage.Result := HTCLIENT;
WinProcess := false;
end;
end;
end;
WM_NCLBUTTONDOWN:
Begin
NotifyUserInput := True;
Assert(False, 'Trace:WindowProc - Got WM_NCLBUTTONDOWN');
End;
WM_NOTIFY:
Begin
WindowInfo := GetWindowInfo(PNMHdr(LParam)^.hwndFrom);
case PNMHdr(LParam)^.code of
MCN_SELCHANGE:
begin
LMessage.Msg := LM_CHANGED;
if WindowInfo^.WinControl <> nil then
lWinControl := WindowInfo^.WinControl;
end;
UDN_DELTAPOS:
begin
if WindowInfo^.WinControl <> nil then
HandleSpinEditDeltaPos(PNMUpDown(LParam));
end;
else
PLMsg:=@LMNotify;
With LMNotify Do
Begin
Msg := LM_NOTIFY;
IDCtrl := WParam;
NMHdr := PNMHDR(LParam);
With NMHdr^ do
case code of
TCN_SELCHANGING:
ShowHideTabPage(HWndFrom, False);
TCN_SELCHANGE:
begin
ShowHideTabPage(HWndFrom, True);
idFrom := Windows.SendMessage(HWndFrom, TCM_GETCURSEL, 0, 0);
end;
end;
end;
end;
end;
WM_PAINT:
Begin
SendPaintMessage;
// SendPaintMessage sets winprocess to false
End;
WM_PASTE:
Begin
LMessage.Msg := LM_PASTEFROMCLIP;
End;
WM_RBUTTONDBLCLK:
Begin
NotifyUserInput := True;
PLMsg:=@LMMouse;
With LMMouse Do
Begin
Msg := LM_RBUTTONDBLCLK;
XPos := SmallInt(Lo(LParam));
YPos := SmallInt(Hi(LParam));
Keys := WParam;
End;
End;
WM_RBUTTONDOWN:
Begin
NotifyUserInput := True;
PLMsg:=@LMMouse;
With LMMouse Do
Begin
Msg := LM_RBUTTONDOWN;
XPos := SmallInt(Lo(LParam));
YPos := SmallInt(Hi(LParam));
Keys := WParam;
End;
End;
WM_RBUTTONUP:
Begin
NotifyUserInput := True;
WinProcess := false;
PLMsg:=@LMMouse;
With LMMouse Do
Begin
Msg := LM_RBUTTONUP;
XPos := SmallInt(Lo(LParam));
YPos := SmallInt(Hi(LParam));
Keys := WParam;
Result := 0;
End;
End;
WM_SETCURSOR:
begin
HandleSetCursor;
end;
WM_SETFOCUS:
Begin
{$ifdef DEBUG_CARET}
DebugLn('WM_SETFOCUS received for window ', IntToHex(Window, 8));
{$endif}
// handle feature mouse-click, setfocus, mouse-click -> double-click
if (Window <> MouseDownWindow) and (MouseDownFocusStatus <> mfNone) then
begin
MouseDownFocusStatus := mfFocusChanged;
MouseDownFocusWindow := Window;
end;
LMessage.Msg := LM_SETFOCUS;
if (lWinControl <> nil) and (lWinControl.FCompStyle = csEdit) then
Windows.SendMessage(Window, EM_SETSEL, 0, -1);
// RadioButton functionality
if (lWinControl <> nil) and (lWinControl is TRadioButton) then
Windows.SendMessage(Window, BM_SETCHECK, BST_CHECKED, 0);
End;
WM_SHOWWINDOW:
Begin
Assert(False, 'Trace:WindowProc - Got WM_SHOWWINDOW');
With TLMShowWindow(LMessage) Do
Begin
Msg := LM_SHOWWINDOW;
Show := WParam <> 0;
Status := LParam;
End;
if assigned(lWinControl) and ((WParam<>0) or not lWinControl.Visible)
and ((WParam=0) or lWinControl.Visible)
and (Application<>nil) and (lWinControl=Application.MainForm) then
begin
if WParam=0 then
Flags := SW_HIDE
else
Flags := SW_SHOWNOACTIVATE;
Windows.ShowWindow(TWin32WidgetSet(WidgetSet).FAppHandle, Flags);
end;
End;
WM_SYSCHAR:
Begin
PLMsg:=@LMChar;
With LMChar Do
Begin
Msg := CN_SYSCHAR;
KeyData := LParam;
CharCode := Word(WParam);
Result := 0;
Assert(False,Format('WM_CHAR KeyData= %d CharCode= %d ',[KeyData,CharCode]));
End;
WinProcess := false;
End;
WM_SYSCOMMAND:
begin
HandleSysCommand;
end;
WM_SYSKEYDOWN:
Begin
NotifyUserInput := True;
PLMsg:=@LMKey;
With LMKey Do
Begin
Msg := CN_SYSKEYDOWN;
KeyData := LParam;
CharCode := Word(WParam);
Result := 0;
End;
WinProcess := false;
End;
WM_SYSKEYUP:
Begin
NotifyUserInput := True;
PLMsg:=@LMKey;
With LMKey Do
Begin
Msg := CN_SYSKEYUP;
KeyData := LParam;
CharCode := Word(WParam);
Result := 0;
End;
WinProcess := false;
End;
WM_TIMER:
Begin
LMessage.Msg := LM_TIMER;
LMessage.WParam := WParam;
LMessage.LParam := LParam;
End;
WM_VSCROLL:
HandleScrollMessage(LM_VSCROLL);
WM_WINDOWPOSCHANGED:
Begin
With TLMWindowPosMsg(LMessage) Do
Begin
Msg := LM_WINDOWPOSCHANGED;
Unused := WParam;
WindowPos := PWindowPos(LParam);
End;
// cross-interface compatible: complete invalidate on resize
if (PWindowPos(LParam)^.flags and SWP_NOSIZE) = 0 then
Windows.InvalidateRect(Window, nil, true);
End;
WM_MEASUREITEM:
Begin
if WParam = 0 then begin
menuItem := TObject(PMeasureItemStruct(LParam)^.itemData);
if menuItem is TMenuItem then
begin
menuHDC := GetDC(Window);
PMeasureItemStruct(LParam)^.itemWidth := MenuItemLength(TMenuItem(menuItem), menuHDC);
PMeasureItemStruct(LParam)^.itemHeight := MenuItemHeight(TMenuItem(menuItem), menuHDC);
ReleaseDC(Window, menuHDC);
Winprocess := False;
end else
DebugLn('WM_MEASUREITEM for a menuitem catched but menuitem is not TmenuItem');
end;
if LWinControl<>nil then begin
if LWinControl is TCustomCombobox then begin
LMessage.Msg := LM_MEASUREITEM;
LMessage.LParam := LParam;
LMessage.WParam := WParam;
Winprocess := False;
end else
if WParam <> 0 then begin
LWinControl := TWinControl(WParam);
if LWinControl<>nil then begin
LMessage.Msg := LM_MEASUREITEM;
LMessage.LParam := LParam;
LMessage.WParam := WParam;
Winprocess := False;
end;
end;
end;
End;
WM_THEMECHANGED:
begin
// winxp theme changed, recheck whether themes are enabled
TWin32WidgetSet(WidgetSet).UpdateThemesActive;
end;
{$ifdef PassWin32MessagesToLCL}
else
// pass along user defined messages
if Msg >= WM_USER then
begin
LMessage.Msg := Msg;
LMessage.WParam := WParam;
LMessage.LParam := LParam;
WinProcess := false;
end;
{$endif}
End;
If WinProcess Then
begin
PLMsg^.Result := CallDefaultWindowProc(Window, Msg, WParam, LParam);
WinProcess := false;
end;
Case Msg Of
WM_MOVE:
Begin
PLMsg:=@LMMove;
With LMMove Do
Begin
Msg := LM_MOVE;
// MoveType := WParam; WParam is not defined!
MoveType := Move_SourceIsInterface;
if (lWinControl is TCustomForm)
and (TCustomForm(lWinControl).Parent=nil) then
begin
if Windows.GetWindowRect(Window,@R) then
begin
XPos := R.Left;
YPos := R.Top;
end else begin
Msg := LM_NULL;
end;
end else begin
if GetWindowRelativePosition(Window,NewLeft,NewTop) then
begin
XPos := NewLeft;
YPos := NewTop;
end else begin
Msg := LM_NULL;
end;
end;
if lWinControl <> nil then begin
{$IFDEF VerboseSizeMsg}
writeln('Win32CallBack WM_MOVE ',lWinControl.Name,':',lWinControl.ClassName,
' NewPos=',XPos,',',YPos);
{$ENDIF}
if (lWinControl.Left=XPos) and (lWinControl.Top=YPos) then
exit;
end;
End;
End;
WM_SIZE:
Begin
With TLMSize(LMessage) Do
Begin
Msg := LM_SIZE;
SizeType := WParam or Size_SourceIsInterface;
GetWindowSize(Window, NewWidth, NewHeight);
Width := NewWidth;
Height := NewHeight;
if lWinControl <> nil then
begin
{$IFDEF VerboseSizeMsg}
GetClientRect(Window,R);
writeln('Win32Callback: WM_SIZE ',lWinControl.Name,':',lWinControl.ClassName,
' NewSize=',Width,',',Height,
' HasVScroll=',(GetWindowLong(Window, GWL_STYLE) and WS_VSCROLL) <> 0,
' HasHScroll=',(GetWindowLong(Window, GWL_STYLE) and WS_HSCROLL) <> 0,
' OldClientSize=',lWinControl.CachedClientWidth,',',lWinControl.CachedClientHeight,
' NewClientSize=',R.Right,',',R.Bottom);
{$ENDIF}
if (lWinControl.Width<>Width) or (lWinControl.Height<>Height)
or lWinControl.ClientRectNeedsInterfaceUpdate then
begin
lWinControl.InvalidateClientRectCache(true);
lWinControl.DoAdjustClientRectChange;
end;
end;
OverlayWindow := GetWindowInfo(Window)^.Overlay;
if OverlayWindow <> 0 then
Windows.SetWindowPos(OverlayWindow, HWND_TOP, 0, 0, NewWidth, NewHeight, SWP_NOMOVE);
End;
End;
BM_SETCHECK:
begin
if (WParam=BST_CHECKED) and (lWinControl is TRadioButton) then
ClearSiblingRadioButtons(TRadioButton(lWinControl));
end;
WM_ENDSESSION:
begin
if (Application<>nil) and (TWin32WidgetSet(WidgetSet).AppHandle=Window) and
(WParam>0) and (LParam=0) then
begin
LMessage.Msg := LM_NULL; // no need to go through delivermessage
Application.IntfEndSession();
LMessage.Result := 0;
end;
end;
WM_QUERYENDSESSION:
begin
if (Application<>nil) and (TWin32WidgetSet(WidgetSet).AppHandle=Window) and
(LParam=0) then
begin
LMessage.Msg := LM_NULL; // no need to go through delivermessage
CancelEndSession := LMessage.Result=0;
Application.IntfQueryEndSession(CancelEndSession);
if CancelEndSession
then LMessage.Result := 0
else LMessage.Result := 1;
end;
end;
end;
// convert from win32 client to lcl client pos.
//
// hack to prevent GetLCLClientBoundsOffset from changing mouse client
// coordinates for TScrollingWinControls, this is required in
// IsControlMouseMsg and ControlAtPos where unscrolled client coordinates
// are expected.
if (PLMsg = @LMMouseMove) and not (lWinControl is TScrollingWinControl) then
begin
if GetLCLClientBoundsOffset(Window, R) then
begin
Dec(LMMouseMove.XPos, R.Left);
Dec(LMMouseMove.YPos, R.Top);
end;
end else
if (PLMsg = @LMMouse) and not (lWinControl is TScrollingWinControl) then
begin
if GetLCLClientBoundsOffset(Window, R) then
begin
Dec(LMMouse.XPos, R.Left);
Dec(LMMouse.YPos, R.Top);
end;
end;
// application processing
if NotifyUserInput then
NotifyApplicationUserInput(PLMsg^.Msg);
if (lWinControl <> nil) and (PLMsg^.Msg <> LM_NULL) then
DeliverMessage(lWinControl, PLMsg^);
// respond to result of LCL handling the message
case PLMsg^.Msg of
LM_ERASEBKGND, LM_SETCURSOR, LM_RBUTTONUP:
begin
if PLMsg^.Result = 0 then
WinProcess := true;
end;
CN_CHAR, CN_SYSCHAR:
begin
// if key not yet processed, let windows process it
WinProcess := LMChar.Result = 0;
WParam := LMChar.CharCode;
end;
CN_KEYDOWN, CN_KEYUP, CN_SYSKEYDOWN, CN_SYSKEYUP:
begin
// if key not yet processed, let windows process it
WinProcess := LMKey.Result = 0;
WParam := LMKey.CharCode;
end;
else
case Msg of
WM_LBUTTONDOWN, WM_LBUTTONUP:
begin
if MouseDownFocusStatus = mfFocusSense then
MouseDownFocusStatus := mfNone;
end;
WM_NCDESTROY:
begin
// free our own data associated with window
if DisposeWindowInfo(Window) then
WindowInfo := nil;
EnumProps(Window, @PropEnumProc);
end;
end;
end;
if WinProcess then
begin
PLMsg^.Result := CallDefaultWindowProc(Window, Msg, WParam, LParam);
case Msg of
WM_CHAR, WM_KEYDOWN, WM_KEYUP,
WM_SYSCHAR, WM_SYSKEYDOWN, WM_SYSKEYUP:
begin
PLMsg^.Result := 0;
case Msg of
WM_CHAR:
begin
// if want chars, then handled already
PLMsg^.Result := CallDefaultWindowProc(Window, WM_GETDLGCODE, 0, 0) and DLGC_WANTCHARS;
LMChar.CharCode := Word(WParam);
LMChar.Msg := LM_CHAR;
end;
WM_SYSCHAR:
begin
LMChar.CharCode := Word(WParam);
LMChar.Msg := LM_SYSCHAR;
end;
WM_KEYDOWN:
begin
LMKey.CharCode := Word(WParam);
LMKey.Msg := LM_KEYDOWN;
end;
WM_KEYUP:
begin
LMKey.CharCode := Word(WParam);
LMKey.Msg := LM_KEYUP;
end;
WM_SYSKEYDOWN:
begin
LMKey.CharCode := Word(WParam);
LMKey.Msg := LM_SYSKEYDOWN;
end;
WM_SYSKEYUP:
begin
LMKey.CharCode := Word(WParam);
LMKey.Msg := LM_SYSKEYUP;
end;
end;
// we cannot tell for sure windows didn't want the key
// for WM_CHAR check WM_GETDLGCODE/DLGC_WANTCHARS
// winapi too inconsistent about return value
if PLMsg^.Result = 0 then
DeliverMessage(lWinControl, PLMsg^);
// handle Ctrl-A for edit controls
if (PLMsg^.Result = 0) and (Msg = WM_KEYDOWN) and (WParam = Ord('A'))
and (GetKeyState(VK_CONTROL) < 0) and (GetKeyState(VK_MENU) >= 0) then
begin
GetClassName(Window, winClassName, 20);
if CompareMem(@winClassName, @EditClsName, High(EditClsName)+1) then
begin
// select all
Windows.SendMessage(Window, EM_SETSEL, 0, -1);
end;
end;
end;
end;
end;
// ignore WM_(SYS)CHAR message if LCL handled WM_(SYS)KEYDOWN
if ((Msg = WM_KEYDOWN) or (Msg = WM_SYSKEYDOWN)) then
begin
if (PLMsg^.Result <> 0) then
begin
{$ifdef MSG_DEBUG}
writeln(MessageStackDepth, ' *ignore next character');
{$endif}
IgnoreNextCharWindow := Window;
end else begin
// stop ignoring if KEYUP has come by (not all keys generate CHAR)
// assume WM_CHAR is always preceded by WM_KEYDOWN
{$ifdef MSG_DEBUG}
if IgnoreNextCharWindow <> 0 then
writeln(MessageStackDepth, ' *stop ignoring next character');
{$endif}
IgnoreNextCharWindow := 0;
end;
end;
{ LMMouseEvent and LMInsertText have no Result field }
if PLMsg = @LMScroll then Result := LMScroll.Result
else if PLMsg = @LMKey then Result := LMKey.Result
else if PLMsg = @LMChar then Result := LMChar.Result
else if PLMsg = @LMMouse then Result := LMMouse.Result
else if PLMsg = @LMMouseMove then Result := LMMouseMove.Result
else if PLMsg = @LMMove then Result := LMMove.Result
else if PLMsg = @LMNotify then Result := LMNotify.Result
else if PLMsg = @LMMouseEvent then Result := 1
else Result := PLMsg^.Result;
Assert(False, 'Trace:WindowProc - Exit');
End;
{$ifdef MSG_DEBUG}
function WindowProc(Window: HWnd; Msg: UInt; WParam: Windows.WParam;
LParam: Windows.LParam): LResult; stdcall;
begin
DebugLn(MessageStackDepth, 'WindowProc called for window=', IntToHex(Window, 8),' msg=',
WM_To_String(msg),' wparam=', IntToHex(WParam, 8), ' lparam=', IntToHex(lparam, 8));
MessageStackDepth := MessageStackDepth + ' ';
Result := RealWindowProc(Window, Msg, WParam, LParam);
setlength(MessageStackDepth, length(MessageStackDepth)-1);
end;
{$endif}
{------------------------------------------------------------------------------
Function: OverlayWindowProc
Params: Window - The window that receives a message
Msg - The message received
WParam - Word parameter
LParam - Long-integer parameter
Returns: 0 if Msg is handled; non-zero long-integer result otherwise
Handles messages specifically for the window used by GetDesignerDC
------------------------------------------------------------------------------}
function OverlayWindowProc(Window: HWnd; Msg: UInt; WParam: Windows.WParam;
LParam: Windows.LParam): LResult; stdcall;
begin
case Msg of
WM_ERASEBKGND:
begin
Result := 1;
end;
WM_KEYFIRST..WM_KEYLAST, WM_MOUSEFIRST..WM_MOUSELAST:
begin
// parent of overlay is the form
Result := Windows.SendMessage(Windows.GetParent(Window), Msg, WParam, LParam);
end;
WM_NCDESTROY:
begin
// free our own data associated with window
DisposeWindowInfo(Window);
end;
else
Result := Windows.DefWindowProc(Window, Msg, WParam, LParam);
end;
end;
{------------------------------------------------------------------------------
Function: ComboBoxWindowProc
Params: Window - The window that receives a message
Msg - The message received
WParam - Word parameter
LParam - Long-integer parameter
Returns: 0 if Msg is handled; non-zero long-integer result otherwise
Handles the messages sent to a combobox control by Windows or other
applications
------------------------------------------------------------------------------}
function ComboBoxWindowProc(Window: HWnd; Msg: UInt; WParam: Windows.WParam;
LParam: Windows.LParam): LResult; stdcall;
begin
// darn MS: if combobox has edit control, and combobox receives focus, it
// passes it on to the edit, so it will send a WM_KILLFOCUS; inhibit
// also don't pass WM_SETFOCUS to the lcl,
// it will get one from the edit control
if ((Msg = WM_KILLFOCUS) or (Msg = WM_SETFOCUS)) and
(Windows.GetTopWindow(Window) <> HWND(nil)) then
begin
// continue normal processing, don't send to lcl
Result := CallDefaultWindowProc(Window, Msg, WParam, LParam);
end else begin
// normal processing
Result := WindowProc(Window, Msg, WParam, LParam);
end;
end;
{------------------------------------------------------------------------------
Procedure: TimerCallBackProc
Params: window_hnd - handle of window for timer message, not set in this implementation
msg - WM_TIMER message
idEvent - timer identifier
dwTime - current system time
Calls the timerfunction in the Timer Object in the LCL
------------------------------------------------------------------------------}
Procedure TimerCallBackProc(window_hwnd : hwnd; msg : DWORD; idEvent: UINT; dwTime: DWORD); stdcall;
Var
TimerInfo: PWin32TimerInfo;
n: Integer;
begin
n := FTimerData.Count;
while (n>0) do begin
dec(n);
TimerInfo := FTimerData[n];
if TimerInfo^.TimerID=idEvent then begin
TimerInfo^.TimerFunc;
break;
end;
end;
end;
{$IFDEF ASSERT_IS_ON}
{$UNDEF ASSERT_IS_ON}
{$C-}
{$ENDIF}
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