lcl: introduce TScreen.DisableForms, TScreen.EnableForms,

lcl: Disabling/Enabling forms before/after showing of modal form
win32: remove win32 specific methods of disabling/enabling windows. Use new TScreen methods instead
win32: disable/enable forms before/after showing some system dialog (fixes bug #0012366, bug #0012382)

git-svn-id: trunk@18629 -

lcl/forms.pp

@@ -851,6 +851,9 @@ type
     procedure RemoveHandlerActiveFormChanged(
                             OnActiveFormChanged: TScreenActiveFormChangedEvent);
     procedure RemoveAllHandlersOfObject(AnObject: TObject); override;
+
+    function DisableForms(SkipForm: TCustomForm; DisabledList: TList = nil): TList;
+    procedure EnableForms(var AFormList: TList);
   public
     property ActiveControl: TWinControl read FActiveControl;
     property ActiveCustomForm: TCustomForm read FActiveCustomForm;

lcl/include/commondialog.inc

@@ -90,7 +90,8 @@ begin
 end;
 
 function TCommonDialog.DoExecute : boolean;
-var CanClose: boolean;
+var
+  CanClose: boolean;
 begin
   FCanCloseCalled := False;
   if Assigned(FOnShow) then
@@ -119,5 +120,5 @@ end;
 
 function TCommonDialog.DefaultTitle: string;
 begin
-  result := '';
+  Result := '';
 end;

lcl/include/customform.inc

@@ -2050,7 +2050,7 @@ function TCustomForm.ShowModal: Integer;
   end;
 
 var
-  //WindowList: Pointer;
+  DisabledList: TList;
   SavedFocusState: TFocusState;
   //SaveCursor: TCursor;
   //SaveCount: Integer;
@@ -2079,6 +2079,7 @@ begin
   Screen.FFocusedForm := Self;
   Screen.MoveFormToFocusFront(Self);
   Screen.MoveFormToZFront(Self);
+  DisabledList := Screen.DisableForms(Self);
   ModalResult := 0;
 
   try
@@ -2120,6 +2121,7 @@ begin
       DestroyHandle;
     end;
   finally
+    Screen.EnableForms(DisabledList);
     if Screen.FSaveFocusedList.Count > 0 then
     begin
       Screen.FFocusedForm := TCustomForm(Screen.FSaveFocusedList.First);

lcl/include/screen.inc

@@ -72,8 +72,9 @@ end;
  ------------------------------------------------------------------------------}
 function TScreen.CustomFormIndex(AForm: TCustomForm): integer;
 begin
-  Result:=FCustomForms.Count-1;
-  while (Result>=0) and (CustomForms[Result]<>AForm) do dec(Result);
+  Result := FCustomForms.Count - 1;
+  while (Result >= 0) and (CustomForms[Result] <> AForm) do
+    Dec(Result);
 end;
 
 {------------------------------------------------------------------------------
@@ -81,8 +82,9 @@ end;
  ------------------------------------------------------------------------------}
 function TScreen.FormIndex(AForm: TForm): integer;
 begin
-  Result:=FFormList.Count-1;
-  while (Result>=0) and (Forms[Result]<>AForm) do dec(Result);
+  Result := FFormList.Count - 1;
+  while (Result >= 0) and (Forms[Result] <> AForm) do
+    Dec(Result);
 end;
 
 {------------------------------------------------------------------------------
@@ -248,6 +250,56 @@ begin
   inherited RemoveAllHandlersOfObject(AnObject);
 end;
 
+{
+  Disable all forms except SkipForm. If DisabledList is available then add forms
+  to that list and return it, otherwise return new list. Used to show forms and
+  other dialogs modal
+}
+function TScreen.DisableForms(SkipForm: TCustomForm; DisabledList: TList = nil): TList;
+var
+  i: integer;
+  AForm: TCustomForm;
+begin
+  Result := DisabledList;
+  if Result = nil then
+    Result := TList.Create;
+  for i := 0 to CustomFormCount - 1 do
+  begin
+    AForm := CustomForms[i];
+    if (AForm <> SkipForm) and AForm.HandleAllocated then
+    begin
+      // we cannot use AForm.Enabled := False; since it checks csDesigning
+      // but we need this for IDE too. We also cannot check AForm.Visible -
+      // it returns wrong info for the forms opened in the designer
+      if IsWindowEnabled(AForm.Handle) and IsWindowVisible(AForm.Handle) then
+      begin
+        EnableWindow(AForm.Handle, False);
+        Result.Add(AForm);
+      end;
+    end;
+  end;
+end;
+
+{
+  Enable all forms from AFormList and destroy list. Used to restore state after
+  DisableForms
+}
+procedure TScreen.EnableForms(var AFormList: TList);
+var
+  i: integer;
+  AForm: TCustomForm;
+begin
+  if AFormList = nil then
+    Exit;
+  for i := AFormList.Count - 1 downto 0 do
+  begin
+    AForm := TCustomForm(AFormList[i]);
+    if (CustomFormIndex(AForm) <> -1) and AForm.HandleAllocated then
+      EnableWindow(AForm.Handle, True);
+  end;
+  FreeAndNil(AFormList);
+end;
+
 function EnumFontsNoDups(
   var LogFont: TEnumLogFontEx;
   var Metric: TNewTextMetricEx;

lcl/interfaces/win32/win32callback.inc

@@ -184,6 +184,7 @@ type
 
 var
   CurDoubleBuffer: TDoubleBuffer = (DC: 0; Bitmap: 0; BitmapWidth: 0; BitmapHeight: 0);
+  DisabledForms: TList = nil;
 
 function CheckMouseMovement: boolean;
   // returns true if mouse did not move between lmousebutton down
@@ -1569,12 +1570,12 @@ begin
         if WParam = 0 then
         begin
           RemoveStayOnTopFlags(Window);
-          DisableApplicationWindows(Window);
+          DisabledForms := Screen.DisableForms(nil, DisabledForms);
         end
         else
         begin
           RestoreStayOnTopFlags(Window);
-          EnableApplicationWindows(Window);
+          Screen.EnableForms(DisabledForms);
         end;
         
       // disable child windows of for example groupboxes, but not of forms

lcl/interfaces/win32/win32proc.pp

@@ -46,7 +46,6 @@ Type
     PWinControl: TWinControl; // control to paint for
     AWinControl: TWinControl; // control associated with (for buddy controls)
     List: TStrings;
-    DisabledWindowList: TList;// a list of windows that were disabled when showing modal
     StayOnTopList: TList;     // a list of windows that were normalized when showing modal
     needParentPaint: boolean; // has a tabpage as parent, and is winxp themed
     isTabPage: boolean;       // is window of tabpage
@@ -102,10 +101,7 @@ function GetDesigningBorderStyle(const AForm: TCustomForm): TFormBorderStyle;
 function AllocWindowInfo(Window: HWND): PWindowInfo;
 function DisposeWindowInfo(Window: HWND): boolean;
 function GetWindowInfo(Window: HWND): PWindowInfo;
-function DisableWindowsProc(Window: HWND; Data: LParam): LongBool; stdcall;
 
-procedure DisableApplicationWindows(Window: HWND);
-procedure EnableApplicationWindows(Window: HWND);
 procedure RemoveStayOnTopFlags(Window: HWND);
 procedure RestoreStayOnTopFlags(Window: HWND);
 
@@ -1082,7 +1078,6 @@ begin
   Result := Windows.RemoveProp(Window, PChar(PtrUInt(WindowInfoAtom)))<>0;
   if Result then
   begin
-    WindowInfo^.DisabledWindowList.Free;
     WindowInfo^.StayOnTopList.Free;
     Dispose(WindowInfo);
   end;
@@ -1095,80 +1090,6 @@ begin
     Result := @DefaultWindowInfo;
 end;
 
-{-----------------------------------------------------------------------------
-  function: DisableWindowsProc
-  Params: Window - handle of toplevel windows to be disabled
-          Data   - handle of current window form
-  Returns: Whether the enumeration should continue
-
-  Used in LM_SHOWMODAL to disable the windows of application thread
-  except the current form.
- -----------------------------------------------------------------------------}
-function DisableWindowsProc(Window: HWND; Data: LParam): LongBool; stdcall;
-var
-  Buffer: array[0..15] of Char;
-begin
-  Result:=true;
-
-  // Don't disable the current window form
-  if Window = PDisableWindowsInfo(Data)^.NewModalWindow then exit;
-
-  // Don't disable any ComboBox listboxes
-  if (GetClassName(Window, @Buffer[0], sizeof(Buffer))<sizeof(Buffer))
-    and (StrIComp(Buffer, 'ComboLBox')=0) then exit;
-
-  if not IsWindowVisible(Window) or not IsWindowEnabled(Window) then exit;
-
-  PDisableWindowsInfo(Data)^.DisabledWindowList.Add(Pointer(Window));
-  EnableWindow(Window,False);
-
-  if (Application <> nil) and (Application.MainForm <> nil) and
-    Application.MainForm.HandleAllocated and (Window = Application.MainForm.Handle)
-  then
-    // In our windowproc we ignore WM_NCACTIVATE for the main form,
-    // if it is not disabled.
-    // Now we disable the mainform, so send WM_NCACTIVATE message;
-    // when we showed the modal form, the mainform was not yet disabled
-    Windows.SendMessage(Window, WM_NCACTIVATE, 0, 0)
-end;
-
-var
-  InDisableApplicationWindows: boolean = false;
-
-procedure DisableApplicationWindows(Window: HWND);
-var
-  DisableWindowsInfo: PDisableWindowsInfo;
-  WindowInfo: PWindowInfo;
-begin
-  // prevent recursive calling when the AppHandle window is disabled
-  If InDisableApplicationWindows then
-    exit;
-  InDisableApplicationWindows:=true;
-  New(DisableWindowsInfo);
-  DisableWindowsInfo^.NewModalWindow := Window;
-  DisableWindowsInfo^.DisabledWindowList := TList.Create;
-  WindowInfo := GetWindowInfo(DisableWindowsInfo^.NewModalWindow);
-  WindowInfo^.DisabledWindowList := DisableWindowsInfo^.DisabledWindowList;
-  EnumThreadWindows(GetWindowThreadProcessId(DisableWindowsInfo^.NewModalWindow, nil),
-    @DisableWindowsProc, LPARAM(DisableWindowsInfo));
-  Dispose(DisableWindowsInfo);
-  InDisableApplicationWindows := false;
-end;
-
-procedure EnableApplicationWindows(Window: HWND);
-var
-  WindowInfo: PWindowInfo;
-  I: integer;
-begin
-  WindowInfo := GetWindowInfo(Window);
-  if WindowInfo^.DisabledWindowList <> nil then
-  begin
-    for I := 0 to WindowInfo^.DisabledWindowList.Count - 1 do
-      EnableWindow(HWND(WindowInfo^.DisabledWindowList.Items[I]), true);
-    FreeAndNil(WindowInfo^.DisabledWindowList);
-  end;
-end;
-
 function EnumStayOnTopRemove(Handle: HWND; Param: LPARAM): WINBOOL; stdcall;
 var
   AStyle: DWord;

lcl/interfaces/win32/win32wsdialogs.pp

@@ -58,6 +58,7 @@ uses
 type
   TApplicationState = record
     FocusedWindow: HWND;
+    DisabledWindows: TList;
   end;
 
   TOpenFileDialogRec = record
@@ -139,10 +140,12 @@ implementation
 function SaveApplicationState: TApplicationState;
 begin
   Result.FocusedWindow := Windows.GetFocus;
+  Result.DisabledWindows := Screen.DisableForms(nil);
 end;
 
 procedure RestoreApplicationState(AState: TApplicationState);
 begin
+  Screen.EnableForms(AState.DisabledWindows);
   Windows.SetFocus(AState.FocusedWindow);
 end;
 

lcl/interfaces/win32/win32wsforms.pp

@@ -72,7 +72,6 @@ type
 
   TWin32WSCustomForm = class(TWSCustomForm)
   published
-    class procedure CloseModal(const ACustomForm: TCustomForm); override;
     class procedure SetAllowDropFiles(const AForm: TCustomForm; AValue: Boolean); override;
     class procedure SetBorderIcons(const AForm: TCustomForm;
           const ABorderIcons: TBorderIcons); override;
@@ -321,11 +320,6 @@ begin
   Result := Params.Window;
 end;
 
-class procedure TWin32WSCustomForm.CloseModal(const ACustomForm: TCustomForm);
-begin
-  EnableApplicationWindows(ACustomForm.Handle);
-end;
-
 class procedure TWin32WSCustomForm.SetAllowDropFiles(const AForm: TCustomForm;
   AValue: Boolean);
 begin
@@ -425,7 +419,6 @@ end;
 
 class procedure TWin32WSCustomForm.ShowModal(const ACustomForm: TCustomForm);
 begin
-  DisableApplicationWindows(ACustomForm.Handle);
   ShowWindow(ACustomForm.Handle, SW_SHOW);
   BringWindowToTop(ACustomForm.Handle);
 end;