cocoa: implementation of DesignDC for forms

git-svn-id: trunk@57083 -

lcl/interfaces/cocoa/cocoagdiobjects.pas

@@ -400,6 +400,7 @@ type
   public
     ctx: NSGraphicsContext;
     isControlDC: Boolean; // control DCs should never be freed by ReleaseDC as the control will free it by itself
+    isDesignDC: Boolean;  // this is a special Designer Overlay DC
     constructor Create(AGraphicsContext: NSGraphicsContext); virtual;
     destructor Destroy; override;
 

lcl/interfaces/cocoa/cocoalclintf.inc

@@ -137,24 +137,17 @@ begin
     DebugLn('TCarbonWidgetSet.GetLCLOwnerObject Result: ' + DbgS(Result));
   {$ENDIF}
 end;
-
+*)
 {------------------------------------------------------------------------------
   Method:  IsDesignerDC
   Params:  WindowHandle - Handle of window
            DC           - Handle of device context
   Returns: If the device context is designer
  ------------------------------------------------------------------------------}
-function TCarbonWidgetSet.IsDesignerDC(WindowHandle: HWND; DC: HDC): Boolean;
+function TCocoaWidgetSet.IsDesignerDC(WindowHandle: HWND; DC: HDC): Boolean;
 begin
-  Result := False;
-  {$IFDEF VerboseLCLIntf}
-    DebugLn('TCarbonWidgetSet.IsDesignerDC Handle: ' + DbgS(WindowHandle), ' DC: ' + DbgS(DC));
-  {$ENDIF}
-
-  if not CheckWidget(WindowHandle, 'IsDesignerDC', TCarbonDesignWindow) then Exit;
-  Result := DC = HDC(TCarbonDesignWindow(WindowHandle).GetDesignContext);
+  Result := (WindowHandle <> 0) and (DC <> 0) and TCocoaContext(DC).isDesignDC;
 end;
- *)
 
 procedure TCocoaWidgetSet.InitClipboard;
 begin

lcl/interfaces/cocoa/cocoalclintfh.inc

@@ -31,9 +31,9 @@ function GetAcceleratorString(const AVKey: Byte; const AShiftState: TShiftState)
 function GetControlConstraints(Constraints: TObject): boolean; override;
 function GetDesignerDC(WindowHandle: HWND): HDC; override;
 function GetLCLOwnerObject(Handle: HWnd): TObject; override;
-
+}
 function IsDesignerDC(WindowHandle: HWND; DC: HDC): Boolean; override;
-
+{
 function PromptUser(const DialogCaption : string;
                     const DialogMessage : string;
                           DialogType    : LongInt;

lcl/interfaces/cocoa/cocoaprivate.pp

@@ -58,6 +58,7 @@ type
     // misc events
     procedure Draw(ctx: NSGraphicsContext; const bounds, dirty: NSRect);
     procedure DrawBackground(ctx: NSGraphicsContext; const bounds, dirty: NSRect);
+    procedure DrawOverlay(ctx: NSGraphicsContext; const bounds, dirty: NSRect);
     function ResetCursorRects: Boolean;
     procedure BecomeFirstResponder;
     procedure ResignFirstResponder;
@@ -414,6 +415,17 @@ type
     procedure lclItemSelected(sender: id); message 'lclItemSelected:';
   end;
 
+  { TCocoaDesignOverlay }
+
+  TCocoaDesignOverlay = objcclass(NSView)
+    callback  : ICommonCallback;
+    procedure drawRect(r: NSRect); override;
+    function acceptsFirstResponder: Boolean; override;
+    function hitTest(aPoint: NSPoint): NSView; override;
+    function lclGetCallback: ICommonCallback; override;
+    procedure lclClearCallback; override;
+  end;
+
   { TCocoaCustomControl }
 
   TCocoaCustomControl = objcclass(NSControl)
@@ -469,6 +481,7 @@ type
     isembedded: Boolean; // true - if the content is inside of another control, false - if the content is in its own window;
     ownwin: NSWindow;
     popup_parent: HWND; // if not 0, indicates that we should set the popup parent
+    overlay: NSView;
     procedure resolvePopupParent(); message 'resolvePopupParent';
     function lclOwnWindow: NSWindow; message 'lclOwnWindow';
     procedure lclSetFrame(const r: TRect); override;
@@ -479,6 +492,7 @@ type
     procedure dealloc; override;
     procedure setHidden(aisHidden: Boolean); override;
     function lclIsHandle: Boolean; override;
+    procedure didAddSubview(aview: NSView); override;
   end;
 
   { TCocoaScrollView }
@@ -1032,6 +1046,35 @@ begin
   {$ENDIF}
 end;
 
+{ TCocoaDesignOverlay }
+
+procedure TCocoaDesignOverlay.drawRect(r: NSRect);
+begin
+  if Assigned(callback) then
+    callback.DrawOverlay(NSGraphicsContext.currentContext, bounds, r);
+  inherited drawRect(r);
+end;
+
+function TCocoaDesignOverlay.acceptsFirstResponder: Boolean;
+begin
+  Result:=false; // no focus
+end;
+
+function TCocoaDesignOverlay.hitTest(aPoint: NSPoint): NSView;
+begin
+  Result:=nil;  // no mouse
+end;
+
+function TCocoaDesignOverlay.lclGetCallback: ICommonCallback;
+begin
+  Result := callback;
+end;
+
+procedure TCocoaDesignOverlay.lclClearCallback;
+begin
+  callback := nil;
+end;
+
 { TCocoaManualScrollView }
 
 function TCocoaManualScrollView.lclGetCallback: ICommonCallback;
@@ -1272,6 +1315,17 @@ begin
   Result:=true;
 end;
 
+procedure TCocoaWindowContent.didAddSubview(aview: NSView);
+begin
+  if Assigned(aview) and Assigned(overlay) and (overlay<>aview) then
+  begin
+    overlay.retain;
+    overlay.removeFromSuperview;
+    addSubview_positioned_relativeTo(overlay, NSWindowAbove, nil);
+  end;
+  inherited didAddSubview(aview);
+end;
+
 procedure TCocoaWindowContent.didBecomeKeyNotification(sender: NSNotification);
 begin
   if Assigned(callback) then

lcl/interfaces/cocoa/cocoawscommon.pas

@@ -70,6 +70,7 @@ type
     function DeliverMessage(Msg: Cardinal; WParam: WParam; LParam: LParam): LResult; virtual; overload;
     procedure Draw(ControlContext: NSGraphicsContext; const bounds, dirty: NSRect); virtual;
     procedure DrawBackground(ctx: NSGraphicsContext; const bounds, dirtyRect: NSRect); virtual;
+    procedure DrawOverlay(ControlContext: NSGraphicsContext; const bounds, dirty: NSRect); virtual;
     function ResetCursorRects: Boolean; virtual;
 
     property HasCaret: Boolean read GetHasCaret write SetHasCaret;
@@ -1191,6 +1192,35 @@ begin
   end;
 end;
 
+procedure TLCLCommonCallback.DrawOverlay(ControlContext: NSGraphicsContext;
+  const bounds, dirty: NSRect);
+var
+  PS  : TPaintStruct;
+  nsr : NSRect;
+begin
+  // todo: think more about draw call while previous draw still active
+  if Assigned(FContext) then
+    Exit;
+  FContext := TCocoaContext.Create(ControlContext);
+  FContext.isControlDC := True;
+  FContext.isDesignDC := True;
+  try
+    // debugln('Draw '+Target.name+' bounds='+Dbgs(NSRectToRect(bounds))+' dirty='+Dbgs(NSRectToRect(dirty)));
+    if FContext.InitDraw(Round(bounds.size.width), Round(bounds.size.height)) then
+    begin
+      nsr:=dirty;
+      nsr.origin.y:=bounds.size.height-dirty.origin.y-dirty.size.height;
+
+      FillChar(PS, SizeOf(TPaintStruct), 0);
+      PS.hdc := HDC(FContext);
+      PS.rcPaint := NSRectToRect(nsr);
+      LCLSendPaintMsg(Target, HDC(FContext), @PS);
+    end;
+  finally
+    FreeAndNil(FContext);
+  end;
+end;
+
 function TLCLCommonCallback.ResetCursorRects: Boolean;
 var
   ACursor: TCursor;

lcl/interfaces/cocoa/cocoawsforms.pp

@@ -483,7 +483,8 @@ var
   R: NSRect;
   pool:NSAutoReleasePool;
   lDestView: NSView;
- begin
+  ds: TCocoaDesignOverlay;
+begin
   //todo: create TCocoaWindow or TCocoaPanel depending on the border style
   //      if parent is specified neither Window nor Panel needs to be created
   //      the only thing that needs to be created is Content
@@ -537,6 +538,15 @@ var
 
     // support for drag & drop
     win.registerForDraggedTypes(NSArray.arrayWithObjects_count(@NSFilenamesPboardType, 1));
+
+    if IsFormDesign(AWinControl) then begin
+      ds:=(TCocoaDesignOverlay.alloc).initWithFrame(cnt.frame);
+      ds.callback := cnt.callback;
+      ds.setAutoresizingMask(NSViewWidthSizable or NSViewHeightSizable);
+      cnt.addSubview_positioned_relativeTo(ds, NSWindowAbove, nil);
+      cnt.overlay := ds;
+    end;
+
   end
   else
   begin